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Nov. 19, 1946.
M_ YUHAS
2,411,405
STARTER ARRANGEMENT FOR SPLIT PHASE MOTORS
Filed Dec? 3, 1943
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2 411,405
UNITED STATES PATENT OFFICE
2,411,405
STARTER ARRANGEMENT FOR S-PLIT
PHASE MOTORS
Marie Yuhas. Chicago, Ill.
Application December 3, 1943, Serial No. 512,696
1
? 1 Claim.
(Cl. 172_279)
The
present
invention relates
to electric
motors
and
more particularly
to means
for closing
ing
the claims.
invention except insofar as
by the
/' it is limited
the circuit through the auxiliary starting wind-
In the drawings:
ng 01' a split phase motor and subsequently
gure 1 is an end view 01' a motor with the
while the motor is running. This winding alone 10 applied thereto; '
however will not start the motor and the stator
Figure 3 is an enlarged VleW Illustrating the
0 he motor has an additional auxiliary windsame structure as is shown in Figure 2 but with
lng thereon which is put into circuit to mitiajly
the winding slots shown in sectlon and the actual
out of circuit once the motor is brought up to 15
speed. The present invention is directed entirely
to an attachment
forthrough
automatically
e??ecting a closure
01? the circuit
the auxiliary
Figure?! is an enlarged fragmentary sectional
View taken on the line 4-4 of Figure 3
Figure
5 is a 3sectional
View taken on the line
5_5
01? Figure
;
winding when the main switch for energizing the
Figure 6 is a Sectional View taken on the line
motor is closed, and automatically opening the 20 6~$ of Figure 3; and
circuit has
of the
winding
as soon as the
motor
builtauxiliary
up its spe
d.
Figure
7 is a 3.Sectional View taken on the line
-?'l
of Figure
n i; e magnetic ?ux due to the reduced current
e main windings of the motor are indicated
drawn by the motor after it is brought up to 30 by the reference numerals l3, I4, l5 and H5. The
speed is utilized to open the circuit of the start
auxiliary windings are idenh?ed by the numerals
ilig winding The entire unit necessary to accomphsh this iesult is housed in a suitable en_
closure
protectsenclosure
it from dust
and
thisthat
particular
mayand
be corrosion
mounted 3'
?i131 '9 and 2 9 leads to the mam Wind
ings are shown at 2| and 22 while the auxiliary
Winding leads are Shbwn at 23 and 2
taken or the fact'that in a standard s lit hase 4" he partiqular mot? sh皐n ?here an?e m" Wind?
motor there are certain of t 6 slots wgichpcom
~ing slots like the slots 25 and 26 within each aux
tam only the mam windings? thus leaving Space
iliary winding where no turns of the auxiliary
scription, reference being had to the accom-
50 outlet of the slot 1
provide an ?elongated'smp
'
' 3o
amines
lead 51 may go to the source oi? current through
3
are separated from the windings outside the slots
insulation-material, this sleeve merely covering
'
In operation, when
the main switch is closed
current is supplied directly to the main windings
l3, id, id and it. This main current, when the
motor is stationary, is quite heavy and creates
my improved switching device 36.
a strong magnetic ?ux in the bars 21 and 28.
Now when current is supplied to the main wind
ing of the motor it will be evident that the bars
2'! and it will be magnetized because of their po
sion of the spring (is so as to close the contacts
by a sheet of insulation 32 (see Figure 3). Also,
each bar is provided with a sleeve is of ?brous
the bar that projects beyond the mo
the main switch.
This attracts the armature iii against the ten
539 and El whereupon current is supplied to the
auxiliary windings ll, it, 69 and 20 because. clos
ing the contacts 69 and ti establishes a circuit
from the lead 5i through the portion 56 of the
are provided whereby
spring 39,?then through the armature
bar Ill
this reversal is prevented from adversely affect
The auxiliary ,
the spring 64 to the lead 2%.
ing the operation of the switching device. The 15 and
winding is thus energized to eifect starting of
bar 21 is passed through the base plate 35 of the
switching device 313 and is provided with a head
the
motorasinthe motor gains running speed the
as soon
{it (see Figure 6). A copper slug 3? is placed
current in the main winding drops
around the bar 21 adjacent the head 36. A
washer 33 of insulation fits against the slug 3? 20 of what it was when the rotor of the motor was
standing still. As a result of the reduced current
and a contact and terminal spring as is mounted
?owing in the main winding the attraction of
beneath the washer 3B. This contact and ter
the armature ill by the bars 21 and 28 is materially
from the bar 21 by a
reduced. In fact, the reduction is adequate to
small washer iii) and an additional washer M is
interposed between the base 355 and the contact 25 permit the spring M to retract the armature and
thus open the contacts $9 and 5!. This takes the
and terminal spring. The entire assembly just
sition in the core of the motor. The reversal of
current through the core affects these bars like it
described is clamped to the base 35 by a nut at
that is threaded on the bar ?2?.
?
auxiliary windings out of circuit and as long as
the motor continues to run the main winding
only will be energized.
The bar 28 is mounted as shown in Figure 7.
The function of the copper slug 31 is to retard
It has a head at thereon and beneath the head 30
the magnetization and reversal of magnetization
53 there is mounted a spring 6Q which rests on
in turn bears ?
in the bar 21 so?that it will not cause the arma
an insulating washer d5 thatv
ture to chatter due to the normal reversal of
against the base 35. A nut � is used to clamp
current in an alternating current source of supply.
' the spring M and the washer 135 beneath the head
I found that without this slug the repeated clos
53. The spring dd carries an armature bar 6i
ing and opening of the contacts 59 and El due to
which is substantially U-shape in cross section
chattering of the armature ill defeated the
as shown in Figure 5. Since the bar ?28 is com
purpose of the device. I found it necessary to
pletely insulated from the motor core .it need not
provide the stop screw 52 to prevent freezing of
be insulated from the spring M which serves as
ill to the head St on the bar 2?. If
a terminal for attachment of the lead 263 from 40
the armature is allowed to contact the heads 38
the auxiliary windings. The spring M so mounts
and at then the lowering of current due to the
the armature bar Q? as to hold the mounted end
build up in speed of the motor may not release the
thereof in close proximity to but spaced from
armature and the? auxiliary windings may remain
the head t3 as illustrated in Figure 3. At its free
end the armature bar iii carries a contact mount
in circuit.
?
The guide yoke 54 serves to limit the backward
ing strip'ilt that has a contact element 59 there
movement of the armature so that it is imma
on. The terminal spring 8% is turned up to pro
the weight of the armature is?
vide a portion 50 that carries a contact 5i posi
terial whether
directed away from the heads 36 and 413 or toward
tioned to be engaged by the contact � when the
armature All is attracted. Two screws 52 of non 50 them. It appears that attractive force obtained
in the starting of the motor is suf?cient to readily
metallic material serve to mount the strip 6% and
overcome the weight of the armature in case
in addition one of ?them extends through the bar
gravity tends to pull the armature away from
�i far enough to provide a stop 53 (see Figures 3
the heads 36 and 613. The armature is made
and 5) which prevents direct contact of the ar
mature bar with the head 36 of the soft iron 55 U-shaped in cross section partially to reduce its
weight and partially because it appears to aid in
.barA 2?.
magnetic attraction of the armature by the heads
guide yoke Fill is looped over the middle of
35 and 63.
.
the armature bar Ill and is provided with a cush
The bars 21 and 28 may be ?xed in the slots
ioning pad 55 to cushion the impact of the ar
the stator in any suitable fashion, However,
mature bar when it ?springs back to the open cir 60 of
I ?nd that it is not necessary to fasten them
cuit position shown in Figure 3. The entire
because the actual attraction tends to pull them
switch assembly is enclosed by a cover 56 which
into the stator slots and the insulating tubes
is mounted on the base 35. The lead it and a
33 limit the inward movement of the bars.
lead 51 to the source of current pass through
It is believed to be evident from the foregoing
65
suitable openings provided in the cover 58 so
description and the drawings that I have pro
that the entire switch assembly may be closed
vided a very simple and effective means for ener
tight to prevent dust from getting into the en
gizing and de-energizing the starting windings
closure and fouling the contacts � and Bi.
of a split phase motor. The device involves very
The wiring diagram for the motor has not
few moving parts and can be made completely
70
been shown but it is believed to be clear that the
dust and gas proof by sealing it in the enclosure?.
main windings 2| and 22 are connected through
Likewise the device is so small and compact
that it can be housed directly within the motor
a main switch to a source of current. The lead
24 is connected, as already described, to the
housing, if desired.
spring 413 while the lead 23 of the auxiliary wind 75 - Having thus described my invention, what I
ing goes to the source of current. Likewise the
2,411,405
�
claim as new ?and desire to secure by Letters
Patent is:
A switch for closing circuit through a starting
winding of a split phase motor and opening said
6
armature away from said means when said means
is energized by starting current in the motor, a
stationary contact and a, contact operably con
nectecl with said armature to engage ?the station?
netizable means and operable to oppose attraction 10 poles of the motor core, and said armature being
a force capable of overcoming the attractive
force
orinsaid
when
energized
by running
current
themeans
motor but
incapable
of holding
the
through said bars.
'
MARIE YUHAs.
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