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Патент USA US3034068

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May 8, 1962
J. A. MONALLY ET AL
3,034,059
ANGULAR POSITION ERROR INDICATOR APPARATUS FOR
SYNCHRO SERVO SYSTEMS
Filed July 10, 1959
3 Sheets-Sheet 1
UNIT UNDER
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INVENTORS
Jay” E. ABATE
JAMEs A. M‘A/ALLY
May 8, 1962
J. A. MCNALLY ET AL
3,034,059
ANGULAR POSITION ERROR INDICATOR APPARATUS FOR
SYNCHRO SERVO SYSTEMS
Filed July 10, 1959
5 Sheets-Sheet 2
UNIT UNDER TEST
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ATTORNEYS
May 8, 1962
J. A. MCNALLY ET AL
3,034,059
ANGULAR POSITION ERROR INDICATOR APPARATUS FOR
SYNCHRO SERVO SYSTEMS
Filed July 10, 1959
mm unosn 1:51
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UNIT UNDER TEST
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Patented May 8, 1962
2
and limited in scope and is not particularly satisfactory
3,034,059
for production testing of synchro servo systems. "
ANGULAR POSITION ‘ERROR INDICATOR APPA
RATUS FOR SYNCHRO SERVQ SYSTEMS
James A. McNally, Upper Montclair, and John E. Abate,
The primary features of this invention are to reference
and measure all angular increments both output and in
put with a single high resistance, high resolution, and high
West Orange, N.J., assignors to General Precision, Inc.,
a corporation of Delaware
accuracy potentiometer used as a reference device, ‘and
.
Filed July 10, 1959, Ser. No. 826,290 ‘
11 Claims. (Cl. 324-158)
to simulate the electrical output and angular position of
v the synchrocontrol transmitter with a single low resist
ance, high resolution potentiometer used as an excitation
This invention relates to synchroservo systemsand 10 device. '
"
The system represented by this invention represents a
synchro components and is particularly directed to means
convenient, relatively inexpensive apparatus, capable of
for electrically testing the angular accuracy of transmis
measuring to a relatively high degree of accuracy, the
sion of such servo systems, and for testing the angular
error in angular position of a synchro servo system, at
accuracy of synchro components.
Synchro servo systems are generally used for transmit 15 increments throughout the entire range of synchro rotor
ting rotational angular motions from one point to one or
more remotely located points by means of an electrical
or combination electrical and mechanical servo system.
The angular motions to be transmitted are generally ap
movement, or 360".
'
'
In addition, thistsystem is equally applicable to synchro '
components, such as synchrotransmitters, synchro re
ceivers, and resolvers.
plied to the rotating armature of a synchro control trans 20 The accompanying drawings, illustrative of one em
bodiment of the invention, and severabmodi?cations
mitter or some modi?cation thereof, which generates three
thereof, together with the description of their construc
tion, the circuitry and the method of operation, control,
output Voltages which are representative of the angular '
position of the armature relative to the stator or a fixed
starting position.
coordination and utilization thereof, will serve to clarify
These voltages are transmitted through an electrical 25 further objects and advantages of the invention.
in the drawings:
’ ‘
circuit to a synchro control transformer, which develops
FIGURE 1 is a simpli?ed schematic diagram of the
an output voltage that is determined by the difference
basic circuit‘ of the angular transmission error indicator,
between its actual shaft position and the position of the
showing the synchro servo system under test, the excita
shaft of the transmitter. The output voltage of the syn
chro conrol transformer is in turn used to control a po 30 tion potentiometer, the reference potentiometer, the
switches used for transferring the circuitry from one
sitioning servo which sets the control transformer shaft
hook-up to another and a phase sensitive voltmeter.
at the same time that it positions a load.
FIGURE 2 is a schematic diagram showing a com
The combination of synchro control transformer, po
parison between a synchro transmitter, and the potenti
sitioning servo, and load constitute a synchro servo re
peater system, that is, a system whose output or load is 35 ometer, which electrically simulates the angular position
of the rotor of the synchro transmitter.
a repeat or an identical transmission of the angular in
FIGURE 3 is a modi?cation of the schematic diagram
formation placed into the synchro control transformer.
This synchro servo repeater system is oftentimes referred
shown in FIGURE 1, for testing essentially the same
to as simply a synchro servo system.
synchro servo system, with an auxiliary servo loop incor
Due to the large number of components that frequent 40 porated, and an error indicator, driven by the motor of
the auxiliary servo loop, for indicating directly the angu
ly enter into such a servo repeater system, and the gear
lar input and output of the synchro servo system under
trains and other transmission means entering into the
positioning servo system, inaccuracies appear at various
points in the system which contribute to an overall error
test.
FIGURE 4 is a simpli?ed schematic wiring diagram
in the transmission of angular information to the load. 45 of another modi?cation of the basic circuit shown in
FIGURE 1, but instead of manual operation, is entire
ly automatic. It shows a pair of reference potentiom
In accurate servo systems, such as those used in the
navigation of aircraft, guided missiles and ships, these
errors, even though they may be relatively small are mag-I.
ni?ed and may result in serious errors in navigation and
operation of the aircraft, or guided missile, or ships.
It is therefore necessary that an accurate test he made
eters, the adjustable contact arms of which are mechan
ically coupled, substituted in place of the transfer switches
50 and the single reference potentiometer shown in FIG
of the angular deviations of the load of the system, rela
tive to the driving angle of the synchro control transmit
ter, in order to determine the acceptability of the synchro
servo system in accordance with established standards, or 55
to arrange for compensation for such angular deviations
at various angular positions.
in the usual synchro servo system, these tests are con
7 ducted by employing an index stand and a synchro con
URE 1, and also shows a servo loop driven by the ad
justable contact arms of one reference potentiometer and
the excitation potentiometer, and an X-axis plotter driven
by the motor coupled to the arms of the reference po
tentiometers. The transmission error of the system is
then the error axis plotter input.
7
,
FIGURE 5 is a schematic wiring diagram of the con
ventional method of determining the error angle of trans
mission of a synchro servo system, showing an auxiliary
trol transmitter for establishing the angular increments 60 synchro transmitter, connected to the synchro control
of input to the servo repeater, and employing a synchro
resistance bridge, with a phase-sensitive voltmeter as a
transformer under test, the rotor of the auxiliary synchro
transmitter being mounted on a rotary index stand, a
synchro resistance bridge selectively connected to the sta
tor coils of the auxiliary synchro transmitter, and the
sistance bridge are combined to reference and determine 65 synchro transmitter of the synchro servo system under
nulling device.
Since the index stand, synchro transmitter, and re
input as well as output angular information, all three
test, and a phase sensitive voltmeter connected to the
contribute to the source of error in the measurement of
synchro resistance bridge.
angular transmission error. The accuracy of the test,
then, is dependent upon the combined accuracy of the
FIGURE 6 is a simpli?ed schematic diagram of a con~
tinuous automatic synchro tester for testing an individual
index stand, synchro transmitter, and resistance bridge, 70 synchro, showing a synchro transmitter under test, an ex-v
citation potentiometer and the reference potentiometer, a
over the range in which the test is made.
servo loop connected into the line connecting one ?eld
This type of testing is of necessity costly, inconvenient
3,034,059
4
coil of the synchro transmitter with the adjustable conj
The stationary ?eld of the synchro transmitter also
tact arm of the excitation potentiometer, a wormrre‘duc
, tion drive incorporated between the adjustable contactvof
, the reference potentiometer and the rotor of the synchro
comprises three coils 25, 25, 27, which are located in
the same relative positions as those of the control trans
former 10(CT).
‘ transmitter 'undertest, an error axis plotter input con
. V
V
‘
The armature rotor 14 of the synchro transmitter
5
'~ trolled'by'the outputof, the adjustable contact arm of
1(CX) is energized’ by the rated voltage which is fed
. the excitation and reference Potentiometers, and an er
from thesource 29;
ror axis plotter driven by the same motor that drives the ..
V
'
.
"
a
i
A low resistance, high resolution, excitation‘potentiom
:worm reduction drive.
eter 34) is connected across two of the ?eld coils 17, 18
- ' FIGURE 7 is a schematic diagram of a modi?cation
by the ‘lines 17a, 18a, the potentiometer 34? serving as
_'of the circuit shown in FIGURE 6 for, testing an individf,
an excitation device forthe synchro servo system control
' ual synchro, showing a differential potentiometer ?tted.
' ‘transformer 16((11') input.
v‘with a rotary stator winding substituted in vplace ‘of the
two Potentiometers shown in FIGURE, 6, a worm driven
A high resistance high resolutiom‘high linearity poten
[tiometerSZ is provided as a reference for the excitation
' reduction gear incorporated between the rotary stator of 15
the potentiometer and the armature rotor of the synchro'
transmitter under test, a servo loop incorporated intothe
potentiometer 39, a double-pole double-throw switch 33,
3/; being provided to directly couple the ‘reference poten
tiometer 32 with the excitation potentiometer 30, when
.line connecting one coil of the'synchro under test, with U the switch 33, 34 is in the upper position 33a, 34a.
the‘ adjustable contact arm of the potentiometer, an er
One of the stator ?eld coils 26 of the synchro trans
_, ror axis plotter driven by the same motor that drives the 20 mitter isconnected to the, end of the coil of the reference
potentiometer 32, which is opposite the end connected
' worm reduction gear, andran error .outputrpotentiometer
yielding the error axis plotter input;
,
_
.
to the switch 34. The mating stator, ?eld coil-1.8 of the
It will be understood that, the following description of
control transformer 10(CT) 'is also connectedrto the
the; construction and the ‘method of mounting, wiring, >
same end of the potentiometer coil 32.
operation, control, coordination. and utilization 'of the:
syncln'o angular position error indicator, is; intended as
.
'
'
‘
.
The third stator coil 19 of the synchro control trans
formerltLfis connected to the adjustable slide or'rotary
explanatory of‘the invention and not, restrictive thereof.‘
contact 35 of the potentiometer 39, which is also con‘
In the drawings, the same reference numerals; designate ,_ t 'nectedto the upper-_ terminal 33a of the second pole 33
‘ the same parts'throughout the‘ various views, except)?‘ of the double-pole switch shown in FIGURE 1.
where otherwise indicated. .;
.
- v
3* A phase sensitive voltmeter 36 is connected to the
_In 'the'basic circuit shown in FIGURE 1, a synchro
slider contact 37 of the reference potentiometer 32, the
' servo system including two synchros, aw synchro control
other terminal of thevoltmeter being connected to the
'
'
30
transformer 16(CT) and a synchro transmitter 11(CX)
are utilized, the rotor armature 12' of‘ the control trans
former 10 being‘directly coupled to the rotor armature
central terminal of the switch 33. .
The reference potentiometerrl‘vz is usedas a reference
for the potentiometeriih, ‘when, theswitch 33, 54 is in
14of the synchro transmitter by .a shaft, or ‘other cou
the position 33a, 34a, shown in FIGURE 1.
pling means 15, shown by'the dotted lines, FIGURE 1.
The potentiometer transfer constant K, of potentiom
eter 32- is adjusted bylmeans of the sliding contact v357,
' The stationary ?eld of the. synchro' control transformer
10comprises three'coils 17, i8, 19, having their mag
V
to simulate any desired angle‘, which is the angle 0 be- '
netic axes equally spaced about the axis of the armature 40 tween the axis of the rotor of the synchro transmitter,
rotor 12. The coils 17, 18, 19 are Y-connected to a
common connection at the center.
The voltage from an external source 20 is fed to two
relative to a ?xed or starting position on the stator
thereof, where
of the ?eld coils 17, 18 of the control, transformer 16,
' and to the excitation potentiometer 30 which serves as a
~ CX simulator and distributes the voltage through the ?eld
Angle 8: are tan
45
or
coils 17, 18, 19 of, the synchro control-transformer, in
amanner hereinafter described in greater detail. '
' The same voltage from the source 20 is also fed to
K1:
the reference potentiometer, through they terminals of a 50
double-pole, double-throw switch, when the switch isin
the upper, position shownin FIGURE 1, in a, manner
hereinafter described in greater detail.
, ' -
'
The voltage distribution through the ?eld‘coils 17, 18,
.
2
MW
When the switches 33 and 34am in the'lower position
' 34b, the coil'of the reference potentiometer 32 is placed
across two’of the coils 25, ‘26, ‘forming two legs of the
stator of the synchro transmitter 11(CX), and the phase
19 of the synchro control transformer, as received from 55 sensitive voltmeter 36’ is connected between the third
the excitation potentiometer, determines the rotational
synchro transmitter coil 27 and the slider 37 of the.
angular position of the armature rotor 12 of the control
reference potentiometer 32.7 If the phase sensitive volt
transformer.
/
"
--
'
'
'
'
The voltage from the armature of the control trans
meter does not indicate a null, there is an error in the
synchro servo system under test. ()ne of several methods
' ' formerl?‘is fed to anampli?er22, the ampli?ed voltage 60 can be used to determine the error.
being fed to a motor generator 23, the shaft of which is
directly mechanically coupled. to the coupling means 15,
by an intermediate coupling '24, shown by dash lines,
FIGURE 1.
'
'
'
By directly mechanically coupling the shafts of the
armature rotor 12 of the ‘synchro control transformer
10(CT) with the shaft of the synchro transmitter 11(CX) "
(1) The slider 37 of the reference potentiometer”
may be adjusted until the phase sensitive voltmeter reads '
null. The difference ‘between the new and old slider
' positions of the auxiliary potentiometer 32 is an indi
65 cation of the error angle.
-
(2) If the error angle is small, the phase sensitive
voltmeter 36 can be calibrated ' to read error angle
through the motor of the motor generator 23, the angular
directly, as the voltage is proportional to the error ‘angle. 1
‘position of the rotor of the synchro transmitter 11(CX)
Procedure
is co-ordinated'with that of the synchro transformer 70
10(CT) at all times,
.
The switch 33, 34 is placed in the position 33a, 34a,
' The voltage’ generated by the generator end of the
motor generator 23, 'is fed back to the ampli?er to pro
with the reference potentiometer slider 37 set at some
I pro-determined value of constant K1.
vide damping for the servoloop consisting of 12, 22,
The sliding contact 35 of the potentiometer 30 is
23. “#111615.
e
'
>
75 adjusted until the voltmeter reads null.
3,034,059
6
K=K1iL
5
The switch 33, 3-’; is placed in the second position
33b, 34b.
(7)
Let eL=simulated angular error due to non-linearity
The error in the synchro system under test is deter
mined by one of the methods described above.
(3)
The switch con?guration shown in FIGURE 1, shows
the switching ‘arrangement for obtaining a simulated
angle of between 0° and 60°.
eII=01_0
Where
1
:
—1
1/3151
(#1 tan 2_KI
' In order to obtain a simulated angle of between 60°
,
and 120°, 120° to 180°, or any other 60° range between
0° and 360°, the stator windings 17, 18, 19, and 25, 26, 10
:
27 of the synchros under test are re-connected in order
to obtain the desired angular range in a manner herein
after described.
—1
V3K
. '4’. l“. 2-K
'¢=actual angle simulated
A switching mechanism 38, 38a, which is operative to
transfer the circuitry controlling the particular 60° angu 15
‘021,11 eiL=talIn
tan 01”“03411 0
l-l-tan 0; tan 0
By substitution and simpli?cation, e1, becomes
lar range of synchro rotor movement, which is fed to
the potentiometers 30 and 32, is incorporated into the
lines 17a, 18a, 19a connecting the ?eld coils of the
synchro control transformer 10(CT) with the coil and
(10)
the slider or rotary contact arm 35, of the potentiometer 20
30 respectively, and the lines 25a, 26a, 27a, connecting
the ?eld coils 25, 26, 27 of the synchro transmitter
V3X L
»
eL=tan-1: 2(K-—K2—1)iL(1—-2K)
I
I A variation of the apparatus shown in FIGURE 1 and
.hereinbefore described, is used in conjunction with the,
11(CX) with the coil and the rotary contact 37 of the
servo-mechanism of an angle position indicator.
reference potentiometer 32 in the manner shown sche
matically in FIGURE 1.
25 ' The modi?cation circuit shown in' FIGURE 3 is sub
stantially the same as the basic circuit shown in FIGURE
The switching mechanism may be a series of push but~
1, except thatwaI-i-motor driven error indicator 42 is substi
tons 0r switches, each covering a particular 60° angular
tuted in place of the phase sensitive voltmeter 36 shown
range, or a rotary switch, or other suitable type of selec
in FIGURE 1.
,
I
tor switch having six control positions.
'_ The rotors of the two synchros, a synchro control trans
A series of push button controlled switches, a switch
former 10(CT), and a synchro transmitter 11(CX) are
ing‘dial, or other suitable switching arrangement 'rnay
mechanically coupled to‘ one another in the Same manner
be provided for this purpose, each push button controlling
as those shown inFIGURE 1.
one angular range of 0° to 60°, or any 60° increment to
360°.
Analysis of Continuous Angle Position Error Indicator,
Type 1
Since the auxiliary potentiometer 32(R1) is the only
reference standard in the entire system, the inaccuracies
two of the ?eld coils 1'7, 18 of the synchro transformer
35
10(CT) to the potentiometer 30, ‘and the adjustable con
tact of the primary potentiometer 30 distributes the volt
age through the ?eld coils 17,18, 19, of the synchro con
trol transformer 10, in substantially the same manner as
that shown in FIGURE 1. '
of the system will be due to the inaccuracies of R1 only.
The analysis will therefore be based on R1.
FIGURES 2 and 2a show a schematic wiring circuit of
a portion of the schematic circuit shown in FIGURE 1.
This shows the connections to the control transmitter
11(CX) and the reference potentiometer 32.
(1)
The same voltage is fed to-the coil of the reference
potentiometer 32 through two terminals of the double
pole double-throw switch 33, 34, when the switch is in
the upper position shown in FIGURE 3 in substantially
the same manner as that shown in FIGURE 1.
45
The three ?eld coils 17,18, 19 of the synchro trans
former 10(CT) are connected to the potentiometer 30,
and the sliding contact 35 thereof, in substantially the
V‘
K1=E1
where K1 is the transfer constant of the potentiometer 32.
If the auxiliary potentiometer 32(R1) is to simulate
the synchro transmitter 11(CX) shown in the schematic
wiring circuit, FIGURE 1, the following must be true.
7E’ sin 6
(2)
KI‘E sin 0+E Sin (0+120")
By simpli?cation K1 becomes
same manner as those shown in FIGURE 1.
The servo loop, including the ampli?er 22 and the ’
motor-generator 23, connected thereto, are substantially
the same as those shown in FIGURE 1,
'
The three coils 25, 26, 27 of the stationary ?eld of the
synchro transmitter, are substantially the same as those
shown in FIGURE 1.
55
The
shown
‘of the
shown
' solving for 01
v
potentiometer 30 is substantially the same as that
in FIGURE 1 and is connected to the ?eld coils
synchro transformer in the same manner as that
in FIGURE 1.
The reference potentiomer 32 is connected to the cen
60 tral terminal of the switch 34 in the same manner as that
1/3 ( K1)
(4)
i
The rated voltage is fed from an external source 20 to
shown in FIGURE 1. The opposite end of the potenti
ometer coil 32 is connected to the line 44, connecting one
—2
_ K1
Plotting K against 0 for a 0 range from 0° to 60°, the
ofthe ?eld coils 26‘ of the synchro transmitter 11(CX)
values of K range from 0 at 0° to .500 at 30°, and 1.000
to one end of the external source.
>
t
at 60°, the actual values ‘over the entire range being given 65
A servo system including an ampli?er 45 is inserted
in the curve.
‘between the central terminal of the switch 33, and the
Error due to non-linearity of auxiliary potentiometer
32(R1)
(5)
2 by de?nition
L=linearity=R
l
adjustable rotary contact 46 of the auxiliary potentiometer.
The ampli?ed voltage from the ampli?er 45 drives a
70
where D=deviation resistance.
(6)
motor 47, which is directly coupled to an error indicator
42, whichdirectly indicates the error angle on a dial in
minutes and seconds of angle.
The adjustable rotary contact 46 of the auxiliary poten
K it +D
D
K =aetual transfer constant=—1‘R1T——-=K1+R'
> tiometer 32 is mechanically coupled to the motor 47 and
75
the error indicator 42, so that the error indicator actually
7 (3,034,059
7
shows the angular position ,ofthe rotarycontactdo of.’ I
the potentiometer 32..
for constant is Kim K1.
input K1 ‘from the reference potentiometer 51, and the
5
angular diflerencawhich is the error angleyisrecorded
tiometer constant K1 set 'at some predetermined value
corresponding, to some angled‘,
'
l
'
'
by means of'anerror axis (Y axis) plotter 58, shown in
‘
FIGURE 4, which is in turn driven by a motor 59, the
With the switch 33, 34- in this position, the slider 35 of
potentiometer 30 is adjusted ‘untilthe error indicator 42
-
7,
'~
7‘
"
t
,
The output of the ,sy'nchro transmitter 11(CX) of the
synchrorsystem under test is compared to the‘reference
Theswitch'33, 34, isOperation
moved into7 the upper position
33a, 34a, shown in FIGURE 3 with the referencepoten
indicates zero error.
8
tion‘device, or synchro transmitter simulator, whose trans
ampli?ed voltage to which is» supplied by a phase sensi
tive amplifier 60, which is connected b'etwecnvthe ad
justable rotary contact 53hr” the potentiometerv 51, and
1 '
When the switch‘ 33, 34 is ‘moved to ‘the second position
33b, 34b, the error'signal, vwhich is the difference vbe
one of the. ?eld coils 27 of the ‘synchro transmitter
15(CX); In order for this signal diiterence to represent ;
, tween the voltage through thethird stator winding 27 of
the true angle error, the speed of response of the synchro
the synchro transmitter 11 and the'voltage at the ad
justable rotary contact 46 ofithe reference potentiometer
15 servo loop under test must be faster than either the drive
input speed or the speed of the motor 57 of the auxiliary
32, is sent tolthe angleposition'error indicators vIf'this '
servo
error signal is not-zero, the ampli?ed voltage'irorn the
ampli?er 45 will drive the motor 4?,"the shaft of which is
loop.
-
g
r
a
H‘
'
I
If the motor 57 ‘is also used to control a Harris of
plotter 61, a continuous relationship between the
-' common with that of the adjustable rotary contact 46 of 20 X-axis
angular arc and the synchro system error angle can
the reference‘ potentiometer 32, until the ‘adjustable con
quickly and-accurately be obtained.
I ,tact 46 reaches a position at whichthe value of the con
- ,‘ With various modi?cations, the circuit shown in FIG
stant K1 is such as to make'the error signal zero. Since
"the shaft of the motor 47 also drives the error, indicator" ,URE 1 can be used for~ calibrating individual synchros,
such as syn'cln‘o' transformers, synchro transmitters, syn
.42,the angle error of‘the synchro servo‘ system under test
is read directly in minutes and seconds on the errorfinl , 25 chro diiferentials, and if the synchro servosystem under
test includes a number of synchro transmitters, the angle
verror curves of» these synchroitransmitters can be obtained
simultaneously, if ya multichannel‘ recorder is'rused in
.dicator
The accuracy
42.
of
a
this system'is‘
' 7 substantially’
; ~, the
"
same
as that shown'in FIGURE 1. In addition, ‘the unit under
test is not subjected tora loading error, as it would be, for
place of the plottersiss‘androl,“
control transformer, or a synchro di?erential input were
used.
,
'
>
i
'
'
'
1
_
,
- '
‘
i
The conventional method now‘ generally in use for test
ing synchro' servo systems, such‘ as those shown in FIG
URE *1, and the other schematic circuits, is shown in
instance, if a standard angle position indicator with a
->
the drawings, FIGURE 5.
7 Another variation of the system shown in ‘FIGURE 1,
1 employsthe essentials of the circuit shown in FIGURE 1,
to form; arser’vo system, the purpose of which is to plot a
continuous angle error curve'of a synchro servo system 7'
under test ‘from 0° to 366°. Theapparatus, a schematic
I
fj
‘-
>
"
>
The unit under test is substantially the same as that
shown in FIGURE 1, and includestwo synchros, a syn- '
chro control transformer itMCT) and a synchro trans
mitter v11(CX), the rotor armature 12 of the-synchro
control transformer being mechanically coupled directly
' . wiring circuit of which is shown in FIGURE 4, therefore
allows a continuous error curve of the servo system under 40 to the rotor armature Ltd of the synchro transmitter in the
7 same manner as that shown in FIGURE 1.
test to be obtainedautomatically, quickly, and to a high
7
degree of accuracy.
The stationary ?eld coils 17, 18, 19, of the synchro
control transformer are substantially the same as, those
shown in FIGURE 1, and are connected in the same
' '
This modi?ed type of apparatus, is probably the most
important of all the circuits shown, as it is readily adapt-.7
able to fullautomatic use, with a consequent reduction
manner.
in testing time, and an increase in production over a
'
I
'
j
a
former 1941GT) is substantially the same as that shown
in FIGURE 1.?
de?nite period, coupled with an, improvement in ac
curacy‘
7
The servo‘loop formed at the synchro control‘ trans
7
The armature 14 of the synchro transmitter v11(CX) is
Description
‘
V
e
In place of the switcht33, 34'shownin FIGURE 1'',’
, energized by a voltage fed from the source 2?, in sub
5,0 stantially the same manner as that'shown in FIGURE 1.
The voltagevfrom the armature rotor ‘12 of'the syn‘
two Potentiometers 50, 51, the shafts supporting the re
chro control transformer 1491GT) which is received'from
the ?eld coils 17, 18,, 1% of the stator, ,is fed to a phase .
7 tary contacts 52, 53 of which are mechanically common, 7
and whose transfer’ constants Kj=K1 are equal, are used.
The rated voltage is fed from an external source 54 to
sensitive ampli?er 65, the ampli?ed voltage being fed to
a motor generator 23, the shaft of which; is directly
' two of the‘ ?eld c'oils l7 and rear the'synchro trans
'18, 19 of the synchro control transformer lMCT), in a -,
coupled to the shaft connecting the rotor 12 of the syn~
chro control transformer 10(CT) to the rotor 14 of the
synchro transmitter 11, in the same manner as that shown
manner similar to that shown in ‘FIGURE 1.
in FIGURE 1.
former 161((11‘), and to: the excitation potentiometer 30,
which distributes thefvoltagetthroughthe ?eld coils 17,.‘
"
5:";
t
‘
The voltage generated by the generator end of the
The-same voltage is also fed to the potentiometer 59;
The shafts 52, 53 or" the rotary contacts of the’potenti
iometer's 513, 51 are driven by a relatively slow speed motor
motor generator 23 is fed back to the ampli?er 65 in the
same'manner, and for the same purpose as in the circuit
shown in FIGURE 1.7
7
I
"
'
' The stationary ?eld coils 25, 26, 27iof'the synchro
Since the speed of the motor 55 is relatively low, the
servo’ loop consisting of an ampli?erv as, an auxiliary 65 transmitter IMCX) are substantially the same as those
shown in FIGURE 1.
“
‘
'
‘
"
motor 57, driven by‘tlie ampli?ed voltage from the any
An auxiliary synchro transmitter 66(CX) 'is mounted
pli?er Sdwvhich reprcsentsthe amplified voltage signals
on an index stand 67.
i
'
from the rotary contact 35 of the excitationvpoten'tiom
The’stationary ?eld of the auxiliary synchro transmit
eter 3i}, and thatiifrom the rotary’ Contact Slot-the po- ' 70
ter 66 consists of three Y-connected coils
6Q, 70.‘
tentiometer 5%, has ample time to reach astabie null
The armature‘ rotor 71 of, the auxiliarysynchro transw
atrany instantaneous position of the rotary contact 52 of
the
potentiometer
56f-
-
I
.
I
>
g
__
c
v In this manner, the control transformer ltit'CT) of the
‘synchro servo systemiunderr test is driven ‘by an‘ excita
' mitter 66 is also substantially the'jsame as that of the
' synchro transmitter. 11, the rotor being fed by a rated
voltage from an external source 72.
a
I
3,034,059
9
19
The shaft of the armature rotor 71 of the auxiliary
synchro transmitter 66 is directly coupled to the ro
tating' element of the index stand, so that it can rotate
Potentiometer 83 is used as a reference device for po
tentiometer 30 which is part of a servo loop which in
turn maintains the transfer constant of potentiometer St)
v
,
to be equal to that of synchro. 11.‘ The di?erence between
The voltage- distribution through the ?eld coils 68,
the transferconstants of potentiometer Sit and 83 is rep
69, 76 of the auxiliary synchro transmitter 66(CX) is
: resentative of the angular error of the synchro, and is pro
controlled by the angular position of the armature rotor
portional to the difference in Voltage between contacts
35 and 84.
71 of the auxiliary synchro transmitter, which is estab
lished by the adjusted position of the index stand 67. As
The servo loop input is from the adjustable rotary con
the ?eld coils 68, 69, 70 of the auxiliary synchro trans 10 tact 35, of the potentiometer 30‘ to the third ?eld coil 27
of the synchro transmitter. The sewo loop consists of a
mitter 66(CX) are directly coupled to the mating ?eld
phase sensitive ampli?er 85, and motor generator 87.
coils 17, 18, 19 of the synchro control transformer
The rotary contact arm 35 of the potentiometer 36 is
itKCT), the voltage distribution through the ?eld coils
directly coupled to and driven by the motor of the motor
17, 18, 19 of the synchro transformer IMCT) is sub
stantially the same as that through the ?eld coils 68, 69, 15 generator 87, thus accurately positioning the slider 35
to correspond with the output of 27.
>
70 of the auxiliary synchro transmitter 66(CX).
The diiference in voltage between contacts 35 and 84
A double-?irow, three-pole switch 73, 74, 75 is in
represent the error signal, ‘and is vampli?ed ‘by ampli?er
serted into the line between a synchro resistance bridge
88, the output of which is sent to the Y-axisinput 89
76, and the ?eld coils of the synchro-‘control transformer
of a recorder, thus yielding the input to the error axis
10(CT) and the synchro transmitter 11(CX) respec
plotter 9t).
*
tively, the operation of the circuit under control of the
Due to the/fact that the potentiometer's 30', 83, operate
two sets of poles of the switch 73, 74, 75 being herein~_
with the index stand 67.
,_ over av synchro angular range of 60°, while the synchro
after described in greater detail.
In the position shown in FIGURE 5 the one set of , transmitter rotor 14 rotates through 360°, a reduction
terminals 73a, 74a, 75a of the switch, is connected to a 25 drive is=necessary between the rotary contact arm 84 of .
the reference potentiometer 33 and the armature rotor 14
set of three lines 78, 79, 86, which serve to connect the
of the synchro transmitter 11 under test. As the refer
?eld coils 68,- 69, 71} of the auixiliary synchro transmitter
ence potentiometer has Nturns, the necessary reduction
with the corresponding ?eld coils 17, 18, 19 of the syn- A
between the rotary contact arm 84 of the potentiometer
chro control transformer IMCT).
A synchro resistance bridge 76 is connected to the 30 83 and the armature rotor 14 of the synchro transmitter 11
central terminals of the switch 73, '74, 75, a phase sensi
A worm driven speed reducer 92 having a reduction
tive voltmeter 36 being connected to the synchro bridge,
of 6N :l is therefore incorporated between?the shaft 93
the voltmeter being substantially the same as‘ that shown
which drives the synchro armature rotor 14- and the shaft
in FIGURE 1, the voltmeter functioning in substantially
the same manner as that shown in FIGURE 1, as here 35 94- which drives the rotary contact arm 84 of the reference‘,
potentiometer 83‘.
I
inafter described in greater detail.
The shaft 95 which drives the worm reduction gear 92
Operation
is driven by an externally controlled input drive, which
is ‘operative to angularly position the armature rotor 14
With the three poles 73, 74, 75, of the switch in the
position shown in FIGURE’ 5, in engagement with the 40 of the synchro transmitter 11, and also the‘ adjustable
rotary contact arm 84- of the reference potentiometer 83;
terminals 73a, 74a, 75a, the synchro resistance bridge 76
The shafts 94, 95 are also used to drive a (9 axis or
is set to a position corresponding to the angular posi
X-axis plotter 96, thus providing a continuing relationship
tion of the synchro transmitter rotor 71 at which the
between the angular are 0 and the error angle of the syn
angle error of the unit under test is to be determined.
The index stand v67 is rotated until a null reading is 45 chro under test in substantially the same manner as that
shown in FIGURE 4.
obtained on the phase sensitive voltmeter 36.
Y A switching mechanism 97 similar to that'shown in
The three poles 73, 74, 75- of the switchare then moved
FIGURE 1, is incorporated into the lines 98, 99, 86, thus
into the position opposite that shown in FIGURE 5, the
poles 73, 74, 75 being in engagement with the other set
of terminds 73b, 74b, 751), shown in FIGURE 5. In
this position, the terminals 73b, 74b, 75b, of the switch
establishing the 60° angular range over which a particular
synchro test is to be conducted in substantially the same
manner as that shown in FIGURE 1 and hereinbefore de
are connected to the three ?eld coils 2'5, 26, 27 of the syn
chro transmitter 11(CX).
scribed in greater detail.
The index stand 67 is again rotated until a null reading
is obtained on the phase sensitive voltmeter. The angular
movement of the index stand from the adjusted angular
position at the start of the test ‘to the angular position
at which a null voltage reading is obtained, is the trans
mission angular ‘error of the synchro servo system under
test.
'
FIGURE 6 shows another variation of the circuits
shown in FIGURES l, 3, 4, and 5, which is used for test
ing individual synchros, such as the synchro transmitter
11(CX) shown in FIGURE 6.
The synchro transmitter 11(CX) under test is similar
-
'
'l
i
V
'
t
t
The schematic circuit shown in FIGURE 6, with ‘minor
modi?cation, can be utilized for determining the electrical
'
angular error of synchro receivers, and synchro resolvers,
in substantially the same manner as that shown in FIG
URE 6 and hereinbefore described, the angular errors
being plotted automatically and continuously throughout
60
the range of 0° to 360° of synchro rotor shaft rotation.
In essence, the fundamental operation of the circuit
shown in FIGURE 6 is substantially as follows:
The auxiliary reference potentiometer 83 is used as a
reference device for the primary potentiometer 30‘, which
is part of a servo loop which co-ordinates the angular
position of the rotary contact arm 35, with the angular
position of the synchro 11;
The difference between the angular position of the po
servo system.
'
tentiometer I30 and the reference potentiometer 83’ is
The stationary ?eld of the synchro transmitter 11(CX)
therefore the angular error of the synchro under test, the
under test consists of three Y-connec-ted coils 25, 26, 27,
similar to those shown in FIGURE 1.
70 angular error being sent to the error axis plotter-90 and
to that shown in FIGURE. 1, but is now not part of a‘
recorded in the manner hereinbefore described.
'
The rated voltage from an external source 29, is fed to
FIGURE 7 shows a modi?cation of the circuit shown
the armature rotor 14, of the synchro transmitter 11(CX),
in FIGURE 6, which is also used for determining the
thus energizing the armature rotor 14. The method of
angular transmissionerror of .a synchro.
establishing the angular position of the armature rotor
during a testis hereinafter described in greater detail.
75 In place ‘of the two potentiometers shown in FIGURE
3,034,059
'
'
'
11'. 3'
l2
.
manner as that shown in FIGURE 1 and FIGURE 6 and
101a is substituted.‘
hereinbefore described.
.
>
'
'
The synchro transmitter 11(CX) underi'test is‘subl
'
'
.6, a single potentiometer 1B1- ?tted with a rotatable stator
a
.,
The N-turn potentiometer 101 is used as a “differential
stantially the same as that shownin FIGURES 1 and 6,.
potentiometer," such that the slider 102 thereof is always
The stationary ?eld of the synchro transmitter is substan~
. .at the errorangle with respect to the rotating stator 101d
of the potentiometer 101.
tially the same as'that shown in FIGURE 6. ' 1 a
. '
-
The ends of the rotary stator 191 of the potentiometer
Itgwill be apparent to those skilled in‘ theviart, that the 7’
are connected to two of the ?eld coils 25, 2a of the syn-f
present invention is not limitedto the speci?c details de
chro transmitter 11(CX). under test.‘ The voltage dif-l
scribed above and shownin the drawings, and that various
ference between adjustable sliding contact arm 102' of the 10 modi?cations are possible in carrying out the features of
. potentiometer 101 and the third ?eld coil 270i‘ the synchro
the invention and the operation and the method of con
trol, connection, metering and utilization thereof, without
departing from the spirit and scope of the appended
' transmitter 11 on line 36, is sent to ampli?er85.
j The rated voltage from an external source 29‘ is fed to '
' _'_. the armature rotor 14 of the synchro transmitter 1,1(CX)
claims.
What?is claimed is:
1. Atestingapparatus for determining the electrical
in the same manner as that shown in FIGURE 6. . ,_
' . _ The?eld coils 25, 2s, 27 of the synchro transmitter l
Cstator are energized by the voltage from the armature
i error angle of transmission of a synchro servo system,
including a driving synchro having a stator ?tted with a
rotor 14, the distribution of the voltage through the ?eld
coils 25, 26, 27, being controlled by the angularjposi
plurality of radially positioned interconnected coils and
tion of the armature rotor 14, in {the same manner as 20 a rotor concentric with the stator, and a driven synchro
that shown in’ FIGURE 6. Two of the ?eld coils 25‘, 26 '
having a stator ?tted with a plurality of radiallypositioned
of. the synchro transmitter are connected
potentiometer
p,
' I
1&1.
" ,
'
tothe ends of
interconnected coils and a rotor, and including means con
V
trolled by the driving, synchro operative to uniformly
'
The statorjcoil 101 of the potentiometer isj-thererforelh "angularly ‘positionrthe rotors of the driving‘ and driven
energized by the ?eld coils 25, v260i‘ the synchropstator. '
synchros, relative to the electrical angular relation of the
The-Yservo loop inputs are the adjustable slider 102 'of
coils of the driving syncho stator, comprising primary
the potentiometer 1&1 andline 86 which'extends from
simulating means electrically connected to the coils of’the
the third, ?eld coil27 of the synchrotransmitter 11(_CX).
" stator of‘t‘he driving synchro to electrically simulatethe
The servo loop consists of a phase sensitive ampli?er S5, 7
rotational angular position, of the rotor of the driving
Whose input is from line. 86 toline 102, and whose out
put drives a motor generator 87.
30 synchro, said primary reference means being a low-resist
ance high resolution excitation potentiometer, said poten
.
The slider 102 of the potentiometer'lttl is directly
tiometer serving as an excitation device for the synchro
servo system controltransformer input, and an auxiliary
. coupled to and driven by the motor of the motor gen
. erator 87,7, thus accurately positioning the adjustable slider
reference mechanism selectively connected to the primary
, 102 of the potentiometer until its voltage output matches 35 simulating means and to predetermined stator coils ofthe
‘that of line 86.
i
driven synchro, said auxiliary reference mechanism hav-,
ing a movable adjustment member incorporated therewith,
The shaft of the motor generator 87 also drives an error
axis plotter input 104, which issimilar to'that shown in
_FIGURE6.
"
~
"
operative to vary the voltage'through the auxiliarylrefer
ence mechanism, said auxiliary reference mechanism be
'
The rotor armature 14 of the synchro transmitter
40
11(CX) under test is energized by the rated voltage from ,
van external source 29 in' substantially the same manner
ing a high resistance, high linearity potentiometer, switch
means adapted to selectively directly couple the reference
potentiometer with an excitation potentiometer, means
a -
operative to selectively transfer-the electrical connections
> The potentiometer 101, operates ' over a ‘60° angle
from the primary simulating means to the stator coils of
the driven synchro, and means operative to selectively
as, that shown in FIGURE 6.
v
,
or range of the rotation of-the synchro transmitter rotor,
in thesame manner as that shown in FIGURE 6.’ v
f
The rotating stator of the potentiometer 101 has N
turns, similar to that shown in FIGURE 6. ’
'
'
- The necessary reduction between the rotary stator 101a
measure the voltage diiferential from the primary simu-V
lating means tothe auxiliary reference mechanism to_in
dicate the electrical angular error of transmission of the
synchro servo system.
;
.
,
,
of the'potentiometer 101 and the armature rotor-14 of 50
2. A testing apparatus for use. in testing a synchro servo
I 1 the synchro transmitter is therefore 6N: 1 in the same man
system for determining the electrical. error angle of trans
ner as'zthat shown inFIGURE 6.
mission of said system, the synchro servo system including
A worm driven speed reducer 92 having a reduction of
a synchro control transformer and a synchro transmitter,
6N:1 is therefore incorporated between the shaft 105‘
with a’motor generator unit driven by ampli?ed voltage
which drives the rotating stator 101a of the potentiometer
received from the rotor of the synchro transformer, di-v
101, and the shaft 93 which drives the synchro transmitter
rectly coupled to the rotors of the synchro transformer
armature rotor 14 in‘ the‘ same'mariner asthat shown in
FIGURE
6.
I
_
e
'
'
'
The shaft 106 which drives the worm driven speed re
ducer 92, is driven by a motor'107 which is controlled by
an externally‘ controlled input drive, the motor 107 be
ing operative to angularly position the armature rotor 14
of the synchro transmitter 11(CX) and also the adjust
able rotary stator 101111”: the potentiometer 101, to co
ordinate them in the same, manner as in the circuit shown
in FIGURE 6'.
>
.
.
a The motor 107 is also used to drive an X-axis plotter
96 inv the same manner as that shown in FIGURE 6;
._ A switching circuit 97 similar to that shown in FIGURE
6 is incorporated into the lines 93, 99, 86 connecting the
?eld coils 25, 26, 27 of the “synchro transmitter, with the
potentiometer 101, and'the slider 102 thereof, thus estab-i'
vlishing the 60° _§ang'ular range over which a particular
I
' and the synchro transmitter, to uniformly angularly posi
tion said rotors, relative'to the stators of the synchros,
comprising means connected‘to the stator of the synchro
transformer and adapted to electrically simulate the angu
lar position of the rotor of the synchro transformer, said
primary reference means being low resistance, high resolu
tion excitation potentiometer, said potentiometer serving
as an excitation device for the synchro servo system con
trol transformer input, an auxiliary reference means se
lectively connected to the primary, simulating means and
to the stator of the synchro'transmitter, said auxiliary
reference means having an adjustable contact incorporated
therewith operativerto varythe voltage of said auxiliary
70 reference means, said auxiliary reference means being a
high resistance, high linearity potentiometer, and switch
means operative to selectively shift the electrical connec
tions to the auxiliary reference means from the‘primary
simulating means to the stator of the synchro transmitter,
synchro test is to be conducted in'substantially. the same 75 and means operative to selectively meter the voltage from
13
3,034,059
14
the reference means to the primary simulating means and
'thene'to the synchro transmitter to indicate the electrical
angular error of transmission of the synchro servo system.
driving synchro operative to electrically simulate the ro
tational angular position of the rotor of the driving
3.. A testing apparatus for use in testing a synchro servo
system for determining the‘ electrical error angle of trans
resistance high resolution potentiometer, saidpotentiom
mission of said system, the synchro servo system includ
system control transformer input, an auxiliary reference
means selectively connected to the primary angle simulat
synchro, said electrical simulating means being a low
eter serving as an excitation device for the synchro servo
I
ing a synchro control transformer and a synchro trans
mitter, with a motor generator unit driven by ampli?ed
ing means and to the stator coils of the driven synchro,
voltage received from the rotor of the synchro transform
said auxiliary reference means having an adjustable con
er, directly coupled to the rotors of the synchro trans 10 tact member incorporated therewith, operative to vary the
former and the synchro transmitter, to uniformly angu
voltage of the auxiliary reference means, said auxiliary
reference means being a high resistance, high linearity po
tentiometer, switch means operative to selectively trans
fer the electrical connections to the auxiliary reference
‘lary position said rotors relative to the stators of the syn
chros, comprising means connected to the stator of the
synchro transformer adapted to electrically simulate the
angular position of the rotor of the synchro transformer, 15 means, from the primary simulating means to the stator
said electrical simulating means being a low-resistance high
resolution potentiometer, said potentiometer serving as an
coils of the driven synchro, and means operative to selec
tively measure and record the voltage differential between
excitation device for the synchro servo system control
transformer input, an‘ auxiliary reference means selective
ly connected to the primary’ simulating means and to the
stator of the synchro transmitter, said auxiliary reference
means having an adjustable contact incorporated there
the primary simulating means and the auxiliary reference
means, to indicate and record the electrical angular error
of transmission of the synchro servo system.
,
6. -A testing apparatus for use in testing a synchro
servo system for determining the electrical error angle
with operative to vary the voltage of said auxiliary refer
'of transmission of said system, the synchro servo system
ence means, said auxiliary reference means being a high
including a synchro control‘ transformer and a synchro
resistance, high linearity potentiometer, switch means op 25 transmitter, the rotors of which are directly coupled to
erative to selectively shift the electrical connections to the
one another,"with a motor generator driven by ampli?ed
auxiliary reference means from the primary simulating
voltage received from the rotor of the synchro trans
means to the stator of the synchro transmitter, and means
former directly coupled to the rotors of the‘ synchro con~
operative to selectively measure the angular differential
trol transformer and the synchro transmitter to angularly
from the primary simulating means to the auxiliary refer 30 position said rotors relative to the stators of the synchros,
ence means to indicate the electrical angular error of trans
comprising a low resistance, high resolution excitation
mission of the synchro servo system.
potentiometer connected‘ to the stator of the synchro
4. A testing apparatus for use in testing a synchro servo ' transformer, said potentiometer being ‘adapted to simulate
system including a synchro control transformer and a
the angular position of the rotor of the synchro trans
synchro transmitter, for determining the electrical error 35 former, an auxiliary reference potentiometer selectively
angle of transmission of said system, said synchro trans
connected to the primary potentiometer, and to the ?eld .
former and synchro transmitter each having ‘a multiple
coils of the synchro transmitten'said auxiliary reference
coil Y-connected stator, and a rotor concentric with the
stator, with means driven by the voltage from the rotor
of thesynchro-transformer, directly coupling the rotors
of the synchro transmitter and the synchro control trans
former, to uniformly angularly position said rotors rela
tive to the respective stators of the synchros, comprising
potentiometer being ,a high resistance,[high resolution,
high linearity potentiometer, said auxiliary reference po
40
tentiometer having a sliding contact operative to vary the
voltage of the potentiometer, a double throw switching
means adapted to selectively shift the connections to the
auxiliary reference potentiometer from the primary po
tentiometer to the ?eld’coils of the synchro transmitter,
transformer, operative to electrically simulate the rota 45 and means operative. to selectively meter and null the
tional angular position of the rotor of a synchro trans
voltage from the primary potentiometer and the synchro
mitter, said electrical simulating means being a low-re
transmitter to the reference potentiometer to indicate the
sistance high resolution potentiometer, said potentiometer
electrical angular error of transmission of the synchro
means electrically connected to the stator of the synchro
serving as an excitation device for the synchro servo sys—_
servo system.
tem control transformer input, an auxiliary reference 50
7. YA testing apparatus for use in testing a synchro
means selectively connected to the primary simulating
servo system for determining the electrical error angle of
means and to the stator of the synchro transmitter, said
transmission of said system, the synchro servo system in
auxiliary reference means having an adjustable contact
cluding a synchro control transformer and a synchro
incorporated therewith operative ‘to vary the voltage
transmitter, each of said synchros having a stator ?tted
through the auxiliary reference means, said auxiliary ref 55 with a plurality of radially located Y-connected ?eld coils,
erence means being a high resistance, high linearity poten
and a rotor concentric with the stator, the rotors of said
tiometer, switch means operative to selectively shift the
synchros being directly coupled to one another, with a
electrical connections to the auxiliary reference means,
motor generator driven by ampli?ed voltage received
from the primary simulating means to the stator coils of
from the rotor of the synchro control transformer directly
the synchro transmitter, and means operative to selec 60 coupled to the rotors of the synchro control transformer
tively measure and record the voltage differential from
and the synchro transmitter to angularly position said
the primary simulating means to the auxiliary reference
rotors relative to the stators of the synchros, comprising
means, to indicate and record the electrical angular error
a primary potentiometer electrically connected to the
of transmission of the synchro servo system.
stator of the synchro control transformer, said primary
5. A testing apparatus for use in determining the elec 65 potentiometer being a low resistance, high resolution vex
trical error angle of transmission in a synchro servo sys~
citation potentiometer, said primary potentiometer being
tern, including a driving synchro having a stator including
operative to electrically simulate the rotational angular
a plurality of Y-connected coils and a rotor, and a driven
synchro having a stator including a plurality of Y-con
position of the rotor of the synchro transformer, an aux
iliary reference potentiometer selectively connected to the
nected coils and a rotor, said servo system including 70 primary potentiometer, and to the ?eld coils of the syn
means controlled by the driving synchro rotor operative
to uniformly angularly position the rotors of the driving
and driven synchros co-ordinated with the electrical an
gular relation to the stator coils of the driving synchro,
comprising primary means electrically connected‘ to the
chrottransmitter, said auxiliary reference potentiometer
being a high resistance, high resolution, high linearity po
tentiometer, said auxiliary reference potentiometer, hav
- ing a sliding contact adapted to vary the voltage through
the auxiliary potentiometer, a double‘ throw switching
3,034,059
" l5
7
rmeans operative to selectively shift the connections to the
'- > auxiliary reference potentiometer from the primary po
tentiometer to the?eld coils of the synchro transmitter,
;and means operative to selectively measure the differen
~
'16
adjustable contact member relative to the coil of new»
iliary reference potentiometer, and means electricallycon
trolled by the relative positions‘of'the ?rst and second
adjustable contact members operative to indicate theelec
tlal from the primary potentiometer and the secondary v5 trical angular error between the‘ established angular posi
potentiometer to, indicatethe electrical angular error of
transmission of the‘ synchro servo system.
‘
_ 8. A testing apparatus for use in determining and re-l »
cording the electrical error angle of transmission in a '
“tion of the synchro rotor, 'and'ithe corresponding angular
position induced in the stator ?eld coils of the synchro
under
test.
,
'
'
t
'
t
V
'
_
-~ 10. An apparatus; for determining ‘and recording the
synchro servo system, including a driving synchro‘ having 1-0 electrical error angle of a synchro including a stator hav
a, statoriincluding a plurality of Y-connected ?eld coils,
ing a plurality ofY-connectcd ?eld coils and a rotor con
centric with the stator, comprising a primary simulating
andsa rotor, and a driven synchro having a stator includ
:rneans electrically connected ‘to two of the ?eld coils of
.ing a plurality of Y-connected ?eld coils, and a rotor, said
vservo system including means controlled by the rotor of
the stator of the synchro, to electrically ‘simulate the- rota
the driving synchro operative to uniformly angularly po 15 tional angular position of the rotor of the synchro, an
sition the'rotors of the‘ driving and driven synchros, co
auxiliary reference mechanism electrically connected to
the primary simulating means, and to the stator ?eld
ordinatedwith the electrical angular relation of the stator
_ ?eld coils of the driving synchro; comprising a primary
coilsof the synchro, the‘primary simulating means hav
ing a'?rst adjustable contact incorporated, therewith
potentiometer electrically connected to two of the ?eld
coils'of the ‘stator of the driving synchro,-operative,to‘ 20 adapted to vary the voltage through-the primary simulat
electrically simulate the rotational.sangulariposition of the
ing means, the primary ‘simulating means being a low
rotor of the driving synchro,_said primary potentiometer
‘being a low resistance, high resolution excitation poten
eter being ‘adapted ‘to serve as an excitation device for
, tiometer, a combination switching and‘ recording control
the synchro servo system control transformer ‘input, the
resistance, high resolution;potentiometer, said potentiom
means including two elements, a ?rst elementrelectrically 25 auxiliaryzreference mechanism’ having a second adjusta
7 connected to the primary angle simulating means, and a
able contact incorporated therewith, operative to vary the
second element electrically connected to two of the ?eld
coils of the driven synchro, co-ordinated with the synchro
seIl/O'System and the angle simulating means, a pair of
auxiliary reference mechanism being a high resistance,
high, linearity potentiometer, a servo loop incorporated
voltage through the auxiliary reference mechanism, said
adjustingmembers operative to individually control the" >30 vbetween one ?eld coil of the synchro stator and the ?rst '
voltage through said ?rst and second elements,’ coupling
adjustable contactto adjust theposition oithe adjustable
-means operative to ‘co-ordinate the adjustedipositions of
contact, in order to co-ordinate'the voltage through the
the adjusting members of the ?rst and second 'ele'mepts, 1 , primary simulating means with-the voltage distribution
externally controlled means operative to adjust the rela-gl ‘through the synchro stator ?eld coils, an ex'tcrnalielectri
tive positionVof-the coupling means, and the adjusted posi 35-cal source adaptedtoenergizethe armaturetro'tor of the ,
‘ tion of the adjusting members relative, to the ?rst and
synchro, means mechanically coupling the second adjust-t '
Iable contact with the rotor of. the synchro under test to
co-ordinatethe rotational angular position of the synchro ‘
rotor relative torthe adjusted position of the second ad
adjusting memberiof thesecond element, and ‘a voltage
/ measuring and recording device controlled by the record- 7 40 'justable contact, externally controlled‘ means operative to
ing control servo loop, adapted to measure the voltage
establish the rotational angular test position of the syn
chrorotor and simultaneously adjust the position of the
diiferential between the stator coils of the driven synchro,
and the second element of the combination switching and
second adjustable contact‘ relative to the auxiliary refer
recording'control means, to indicate and record the elec
ence mechanism, and means electrically controlled by the
trical error angle of the synchro servo system under test. y ?rst and second adjustable contacts adapted to indicate
9. An apparatus for determiningand recording the elec a and record the angular error between the established an~
trical error angle of'a synchro, said synchro including a
gular position of the synchro rotor, and the correspond
' stator having a plurality of Y-connected ?eld coils and a
ing electrical angular position induced in the stator ?eld
coils of the synchro under test.
rotor concentric with the stator, comprising a primary
potentiometer including a coil electrically connected to
'11. An apparatus for determining and recording the
two of the stator‘?eld coils of the synchro, said primary
electrical error angle of a synchro,psaid synchro including
potentiometer being~ operative to electrically simulate the , a stator having a plurality of Y-connected ?eld coils, and
angular position'ofithe’rotor‘pof the synchro under test,
a rotortcomprising a primary potentiometer, including a
, second elementsv of, the switching and recording control
: ‘means, a recording control servo loop controlled by the
rotatable stator and an adjustable contact member incor
relative to the stator thereof, a ?rst adjustable contact
member operative to regulate the voltage through the pri
porated with the potentiometer, the rotatable stator of
Imary potentiometer,‘ said primary potentiometer being a 5 ,the potentiometer being connected to two of the ?eld coils
low resistance, high resolution excitation potentiometer, '
,of'the synchro,‘the primary potentiometer being a low re
a servo system connected between one of the stator coils
sistance, high resolution potentiometer, said potentiom
of the synchro under test and the ?rst adjustable contactv eter being adapted to electrically simulate the angular
member, operative to adjust the position of the adjustable , position of the rotor of the synchro under test relative to
contact member to co-ordinate' the voltage through the
the stator thereof, the adjustable contact member being
primary potentiometer with the-angular voltage distribu
adapted to regulate the voltage through the potentiom
tion through the synchro stator ?eld coils, an external
eter, a servo loop, connected between one of the coils of . ,
electrical source adapted to energize the armature rotor
the stator of the synchro under test and the adjustable
of the synchro, an auxiliary: reference potentiometer hav 65 contact member, adapted to adjust'the position of the
a coil connected to the coil of the primary potentiom
adjustable contact memberrelative tolthe rotary stator’
, eter, a second adjustable contact member incorporated,
with the auxiliary reference potentiometer to adjust the
voltage through the auxiliary reference potentiometer,
of the potentiometer to co-ordinate the voltage through
the potentiometer with the angular voltage distribution
through the synchro stator ?eld coils, ‘an external elec
7'0
trical
source operative to energize the armature rotor of
j intact member with the rotor of the synchro to co-ordinate
' the synchro, means mechanically coupling the rotatable
.the rotational angular position of the synchro rotor, rela
stator of the potentiometer'with the rotor of the ‘synchro
tive, tothe adjustedv position of the second adjustable con
to ‘co-ordinate the rotational angular position of the syn- '
tact‘ member, externally controlled means operative to es
chro rotor, relative to the adjusted position of the ad
tablish the rotational angular" position of the synchroi
' rotor and simultaneously adjust the position of the second ’75 justable contact member, the mechanical coupling means
7 ‘means mechanically coupling the second adjustable con
3,034,059
17
18
having a reduction member incorporated therewith adapt
References Cited in the ?le of this patent
UNITED STATES PATENTS
ed to co-ordinate the rate of rotation of the rotatable
stator coil of the potentiometer with the rotor of the syn
chro, exernally controlled means operative to establish the
rotational angular position of the synchro rotor and si
multaneously correspondingly adjust the rotational angu
lar position of the rotatable stator coil of the potentiom
eter, and means controlled by the servo loop operative to
indicate and record the electrical angular error between
the established angular position of the synchro rotor and 10
the corresponding angular position induced in the stator
?eld coils of the synchro under test.
lyn
2,237,225
2,402,108
2,473,682
2,508,424
2,625,599
2,692,814
2,726,382
2,772,412
2,841,768
2,966,669
Heuschmann __________ __ Apr. 1, 1941
Willard ______________ __ lune'll, 1946
Harris et al ___________ __ June 21, 1949
Rouy _______________ __ May 23, 1950
Downes ______________ __ Jan. 13,
Mathes et al __________ __ Oct. 26,
Bell __________________ __ Dec. 6,
Weiher ______________ __ Nov. 27,
Robinson _____________ __ July 1,
1953
1954
1955
1956
1958
Walker et a1 __________ __ Dec. 27, 1960
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