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Dec. 31, 1946.
w. D. swALLow
2,413,340
I‘ORSIONAL VIBRATQRY ELECTRIC MOTOR;
Filed March 25, 1944
5 Sheets-Sheet l
INVENTOR
?f/?cW/l 20/7051? 6205/70”
BY
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Dec. 31, 1946. _
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w, D_ SWALLQW
2,413,340
'TORSIONAL VIBR'ATORY ELECTRIC MOTOR
Filed March as, 1944‘
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“
z, Sheets-Sheet 2
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INVENTVOR,
7147/16/77
21/1205” J'wailom
Patented Dec. 31, 1946
UNITED STATES PATENT OFFICE
2,413,340
TORSIONAL VIBRATORY ELECTRIC MQTQR
William Duncan Swallow, Los Angeles, Calif., as
signor of two-thirds to Herbert E. Pelton and
George S. lPelton, both of Los Angeles, Calif.
1
Application March 23, 1944, Serial No. 527,813
9 Claims. (Cl. 172-125)
2
This invention relates to improvements in tor
sional vibratory electric motors and has for its
principal object the production of a torsional
whereby the vibratory parts will function prop
erly.
Opposite end portions of base iii are provided
with integral blocks l2 which are grooved at M
electric motor having an element to be moved
which controls an electric means to regulate the
to present walls it between which the depending
bases 58 of clamps 2-3 are adapted to snugly ?t.
Each clamp is rigidly held in position relative
to the base by means of bolts 2| which pass
through holes 22 and 24 formed through the
walls l6 and clamp base It? respectively. A plu
current frequency of said motor. This is an im
‘ provement over my Electrical reciprocating mo
tgr,
Patent No. 2,297,084, issued September 29,
l.
..
Another object of the present invention is the
production of a torsional electric motor whereby
rality of holes 22 are provided in walls i6 so as to
vibratory movement is imparted to a mass by an
permit axial adjustment of the clamps 20 toward
oscillatory movement of the motor.
and from each other.
A torsional spring or torsional vibratory mem
15 ber 25 is mounted with its end portions ?xed in
bratory member of predetermined frequency of
the spaced apart clamps 29 so as to normally
vibration to which an element of variable mass
preclude any movement of the end portions of
is connected for to and fro movement therewith,
member 26 relative to the base iii. The frequene
and electrical means operable in conjunction with
cy and amplitude of oscillatory movement of
said torsional vibratory member to e?ect move 20 that portion of member 26 between clamps 20
ment of said element of variable mass.
may be varied by adjusting the clamps toward
Another object is the provision of an electric
and from each other. Since clamps 20 are inde
A further object of the invention is the pro
vision of an electric motor having a torsional vi
motor having a torsional vibratory member se
pendently adjustable, it is quite apparent that
one clampmay be adjusted to make rigid one
ment, and electro-reactive means whereby the 25 end of member 26 while the other end thereof
central portion of the vibratory member is caused
is permitted to oscillate in the other clamp mem
to torsionally vibrate, and electric means con
ber. When so anchored, the free end of member
trolled by the frequency of vibration of said tor
26 may be rigidly attached directly to a load
cured at its opposite end against torsional move
sional vibratory member whereby the electro-re
such as a structural member to be vibrated.
It will be noted that clamps 29 are split at 28
the vibratory movement of said torsional vibra
to permit a limited opening and closing of the
clamp sections against the member 26. Bolts 36
passing through holes 32 formed in the free eX
active means is maintained in synchronism with 30
tory member.
With these objects in view, as well as other
objects which will appear during the course of
tremities of the clamp are adjustable to cause a
the speci?cation, reference will now be had to 35 secure gripping of the torsional member 26 or to
the drawings wherein:
permit its free movement therein.
Fig. 1 is a side elevational view of a torsional
In the motor shown, it will be observed that
vibratory electric motor embodying this inven
the ?eld winding is stationary, while the arma
tion.
ture windings are movable. The ?eld windings
Fig. 2 is a front elevational View of the motor. 40 4% are carried by the ring-shaped motor case 36
Fig. 3 is a central sectional view of the motor
which is nested in the adapter plate 38 and se
taken on line III—III of Fig. 1.
cured to the base plate H? by means of machine
screws 40. The torsional member 25 is cylin
Fig, Al is a sectional view taken on line IV-—IV
of Fig. 3.
drical in form and when mounted in clamps 2b
45
is in axial alignment with the ring motor case 36.
Fig. 5 is an enlarged sectional view taken on
line V-V of Fig. 2.
Cores 42 are laminated and carry the ?eld
coils 44,. as clearly shown in Figs. 1 and 3. The
Fig. 6 is a sectional view taken on line VI—VI
of Fig. 5.
armature core 46 is rigidly secured to torsional
spring‘ member 26 at A8 and carries the armature
Fig. '7 is a diagrammatic view of the electric
50 coils 59. This armature core 4'6 is centrally po
circuit of said motor.
Throughout the several views like reference
characters refer to similar parts and the nu
meral l0 designates a motor base which is adapt
sitioned between the clamp members 29, thus in
suring equal torsional movements of the member
26 at both sides of its driving unit. In Fig. 5,
ed to be ?xed to anchoring means, not shown, 55 the armature is shown in the neutral position
with respect to the ?eld. This position may be
2,413,340
3
4
a variable load, which includes: a cylindrical
varied to conform with requirements at different
frequencies and amplitudes.
torsion rod; means adjustable along the length
of said torsion rod for clamping each end thereof
in ?xed position whereby the central portion of
Rocker arms 52 and ~54 positioned respectively
at opposite sides of the motor are fastened di
rectly to the armature by means of bolts 56 and
said rod can be twisted; a rocker arm ?xed to the
central portion of said torsion rod and adapted
extend radially therefrom in substantially paral
to be connected to a load to be v'brated; an
lel relation to receive a mass 58 which is secured
electro-reactive member surrounding the central
to said arms by member (it. The distance of the
portion of said torsion rod and movable there
support of the mass from the axis of oscillation
with; a stationary electro-reactive member sur
10
may be of any desired length to produce the de
rounding said first electro-reactive member and
sired amplitude of vibration. When the clamps
2d are set tightly against member 26 only that
portion of 26 intermediate said clamp members is
adapted
sion rod
reactive
with its
permitted to oscillate. This csc'illatable portion
of the torsion spring member will move at its
to cooperate therewith to twist said tor~
when current is supplied to said electro
members; an audio frequency ampli?er
output connected to one of said electro
reactive members to supply a power current
?xed resonant period when power is applied.
Furthermore, by changing the distance between
thereto; current generating means operable by
the oscillations of said torsion rod to generate a
the clamps, the amplitude and frequency of oscil
current whose frequency is determined by the
lation may be varied.
frequency
of vibration of said torsion rod; and
An electric pick-up or generating device 62 20 means connecting
said generating means to said
comprises a stationary coil 54 which is carried
ampli?er whereby said generated current will
by magnet 55‘, attached to housing 68 which in
vcontrol the frequency of said power current to
turn is secured to the motor case .36. A soft iron
thereby synchronize the same with the ire-quency
rod 1!] secured to oscillate with armature t6 moves
of vibration of said torsion rod.
.
in coil 654 to generate a current therein in syn
2. A torsional electric motor adapted to vibrate
chronism with the movement of said armature.
a variable load, which includes: a cylindrical
Reference will now be had to Fig. 7 showing
torsion member; means adjustable along the a typical circuit whereby this motor is operated.
length of said torsion member for clamping an
Obviously, there are many ways of winding this
end thereof in ?xed position whereby said mem
motor. In the present showing, the ?eld is sta v30 ber can be twisted; a rocker arm ?xed to said
tionary and the armature windings are movable.
torsion member and adapted to be connected to
This arrangement might be reversed, also it would
a load to be vibrated; an electro-reactive mem
be possible to have both windings stationary and
ber surrounding said torsion member and mov
the armature consisting only of a short #circuited
able therewith; a stationary electro-reactive
copper bar ‘similar ‘to the arrangement used in :35
member surrounding said ‘?rst electro-reactive
the induction motor. The principal requirement
member and adapted to cooperate therewith to
of the'circuit is to obtain a resonance operation
twist said torsion member when current is sup
bymeans or" the feed back circuit. The coil 84
plied to said electro-reactive members; an audio
is connected by wires l2 and ‘it to the audio
frequency ampli?er with its output connected to
frequency ampli?er "it. The output power stage 40 one of said electro-reactive members to supply
is connected by wires 13 and 80 to the armature
a power current thereto; current generating
coils 58 which are connected in series. Ampli?er
means operable by the oscillations of said tor
feed Wires 82 and 84 ‘are connected with a suitable
sion member to generate a current whose frequen
electric power source, not shown. Generator 86
cy is determined by the frequency of vibration
in series with the ?eld windings t4 serves to excite 45 of said torsion member; and means connecting
these coils.
said generating means to said ampli?er whereby
By means of this structure and electrical hook
said generated current will control the frequency
up, it is quite apparent that the electro-‘reactive
of said power current to thereby synchronize the
means operable ‘to cause a torsional vibratory
same with the frequency of vibration of said tor~
150
movement of that portion of the torsional vi
sion member.
bratory member between the clamps will be main
3. A torsional electric motor adapted to vibrate
tained in synchronism ‘with the oscillatory move
a variable load, which includes: a cylindrical
ment of the torsional vibratory member clue to
torsion rod; means adjustable alongthe length
the electric pick-up controlled thereby.
of said torsion rod for clamping each end thereof
This electric torsional vibratory motor provides
in ?xed position whereby the central portion of
for an electro-reac'tive means suitable for im
said rod can be twisted; a rocker arm ?xed to
parting a- torsional to and ‘fro movement to a
the central portion of said torsion rod and adapt
torsional vibratory member of predetermined fre
ed to be connected to a load to be vibrated; an
quency which in turn controls an electric pick-up
electro-reactive member surrounding the central
‘portion of said torsion rod and movable there
or generator which serves to control the fre
quency of current from an electric power lfeed
source to said electro-reactive driving means
with; a stationary electro-reactive. member sur
rounding said ?rst electro-reactive member and
adapted to cooperate therewith to twist said tor
sion rod when current is supplied to said electro
reactive members; power supply means connect
whereby the‘frequency of the current to said
eleetro-reactive driving means is maintained in ,,
synchronism with the vibratory movement of the ‘
torsional vibratory member at all times.
It is evident from the foregoing description
that many minor changes might be made'both
in the. general structure of ‘the motor and the
controlling electric circuit without departing from
the spirit‘ of the invention.
Having thus described the invention, what I
claim as new and desire to be secured by Let
ters Patent is:
1. A torsional electric motor adapted to vibrate
70
75
ed to one of said electro-reactive members to
supply a power current thereto; current gener
ating means operable by the oscillations of said
torsion rod to generate a current whose fre
quency is determined by the frequency of vibra
tion 'of said torsion rod; and means connecting
said generatingmeans to said power supply means
whereby said generated current will control the
frequency for said power current to thereby “syn-v
5
2,413,340
chronize the same with the frequency of vibra
tion of said torsion rod.
4. A torsional electric motor adapted to vi
brate a variable load, which includes: a cylindri
cal torsion member; means adjustable along the
length of said torsion member for clamping an
end thereof in ?xed position whereby said mem
ber can be twisted; a rocker arm ?xed to said
6
bers; power supply means connected to one of
said electro-reactive members to supply a power
current thereto; frequency control means whose
frequency is determined by the frequency of vi
bration of said torsion member; and means con
necting said frequency control means to said pow~
er supply means whereby the current from said
frequency control means will control the fre
quency of said power current to thereby syn
a load to be vibrated; an electro-reactive member 10 chronize the same with the frequency of vibra
surrounding said torsion member and movable
tion of said torsion member.
therewith; a stationary electro-reactive member
7. A torsional electric motor adapted to vi
surrounding said ?rst electro-reactive member
brate a variable load, which includes: electro
and adapted to cooperate therewith to twist said
reactive means comprising a stator and a rotor
torsion member when current is supplied to said
concentrically mounted; means for supplying a
electro-reactive members; power supply means
power current to said electro-reactive means to
connected to one of said electro-reactive mem
cause said rotor to oscillate; a vibratory member
bers to supply a power current thereto; current
connected to said rotor adapted to be vibrated
generating means operable by the oscillations of
thereby and to limit and reverse the rotation
said torsion member to generate a current whose 20 thereof; means adapted to connect said rotor to
frequency is determined by the frequency of vi
a load to be vibrated and to amplify the ampli
bration of said torsion member; and means con
tude of the vibrations of said rotor imparted to
necting said generating means to said power sup~
said load; means operatively associated with said
ply means whereby said generated current will
electro-reactive means for generating a current
control the frequency of said power current to 25 responsive to the oscillations of said rotor; and
thereby synchronize the same with the frequency
means connecting said generating means to said
of vibration of said torsion member.
power supply means to control the frequency
5. A torsional electric motor adapted to vibrate
thereof and thereby synchronize the same with
a variable load, which includes: a torsion mem
said vibratory member.
ber; means for clamping an end of said torsion 30
8. A torsional electric motor adapted to vi
member in ?xed position whereby said member
brate a variable load, which includes: a vibratory
can be twisted; a rocker arm ?xed to said tor
member mounted for oscillation; electro-reactive
torsion member and adapted to be connected to
sion member and adapted to be connected to a
load to be vibrated; an electro-reactive member
surrounding said torsion member and movable
therewith; a stationary electro-reactive member
surrounding said ?rst electro-reactive member
and adapted to cooperate therewith to twist said
torsion member when current is supplied to said
electro-reactive members; power supply means
connected to one of said electro-reactive members
to supply a power current thereto; frequency con
trol means whose frequency is determined by
the frequency of vibration of said torsion mem
ber; and means connecting said frequency con
trol means to said power supply means whereby
the current from said frequency control means
means comprising a stator and a rotor, said rotor
being mounted on said vibratory member within
said stator so that oscillation of said rotor will
cause oscillation of said vibratory member, said
member limiting the rotation of said rotor; means
imparting the oscillations of said rotor and vi
bratory member to a load to be oscillated; means
for varying the ‘resonant frequency of said vi
bratory member; means for supplying a power
current to'said electro-reactive means; and elec
tric means operable by the oscillation of said ro
tor for controlling the frequency of said power
45 current to synchronize the same with said vi
bratory member.
9. A torsional electric motor adapted to vibrate
will control the frequency of said-power current
a variable load, which includes: electro-reactive
to thereby synchronize the same with the fre
means comprising a stator and a rotor concen
quency of vibration of said torsion member.
50 trically mounted; means for supplying a power
6. A torsional electric motor adapted to vibrate
current to said electro-reactive means to cause
a variable load, which includes: a torsion mem
said rotor to oscillate; a vibratory member con
nected to said rotor adapted to be vibrated there
by and to limit and reverse the rotation thereof;
rocker arm ?xed to said torsion member and 55 means imparting the oscillations of said rotor and
adapted to be connected to a load to be vibrated;
vibratory member to a load to be oscillated; means
an electro-reactive member ?xed to said torsion
for supplying a power current to said electro
member and rotatable therewith; a stationary
reactive means; and electric means operable by
ber; means for clamping said torsion member
in ?xed position whereby it can be twisted; a
electro-reactive member surrounding said ?rst
the oscillation of said rotor for controlling the
electro-reaotive member and adapted to coop 60 frequency of said power current to synchronize
erate therewith to twist said torsion member when
current is supplied to said electro-reactive mem
the same with said vibratory member.
WILLIAM DUNCAN SWALLOW.
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