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Патент USA US2508143

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May’ 16, 1950
2,508,143
J. c. BURDETT
SINGLE-PHASE ELECTRIC MOTOR
Filed Aug. 17, 1948
42
Fig.l.
40
m
43
M
.
44
50
42
Fig.2.
WITNESSES:
INVENTOR
John C. BurdeH.
BY 71/”,
29%
ATTORNEY
Patented May 16, 1950
2,508,143
:iTED
TAT-ES PATIENT rQ()EFFIICE
2,508,143
'SINGLEPHASE ELECFITRJQ MQEI‘QR
John C. Burdett, Lima, Ohio, assignor ‘to ‘West
inghcuse Electric Corporation, East j-Pittsburgh,
Pa” a corporation of Pennsylvania
Application August 17, 1948, Serial ,No. 414,640
6-Claims. (01. 3-18-4525)
i
2
fllhe present invention relates to single-phase
is to provide a tapped main ‘primary winding for
single-phase vinduction motors which is relatively
electric motorsand more particularly to a single
phase induction motor having a tapped main pri
mary winding
;SingIeFphase induction ,motors are sometimes
usedin applications .in which a relatively high
torque vis -,r_equired ifor short periods.
inexpensive, and which can be "provided at sub
stantially the same cost as a conventional un
tapped winding.
Anotherobject of the invention is “to provide .a
One ex
tapped main “primary winding 'for single-phase
induction motors in which each pole Q'fthewind
ample ,ofsuch .an application is thedriving motor
for automatic washing machines, in which the tub
or basket containing the .clothes is rotated at
one ,speed ,ior washing and at .a considerably
higher spee d; for .drying. The .motor which .drives
ing ‘consists of a plurality of coils, and in which
the basket .must ‘be capable of . developing a rela
maining coilslof all the poles connected together
to ‘.form the other section. This winding can,
therefore, be woundatlow cost in the same man
at least one coil of eachpole is connected sepa
rately to corresponding coils of all the other poles
to;forrn one section of the winding, with the ,re-‘
tivelyhightorquefgor accelerating the lbasketirom
the washing speed-to thedrying speed, but since ~
this high torque is required only for relatively
ner as a conventional untapped winding, and is
short-periods, it is .noteconomieally .desirable to
readily adaptable ‘to machine winding, since it
use a .motor which is capableof developing this
differs ‘from the conventional winding .only in the
high torque continuously. In this and similar
applications, in whichhigh torques are required
only ,fjorshort periods, a. smaller motor is (usually
used which ‘is. capable of ‘developing the lower
torquerequilfed ;for the .greater part of the .op
connections ‘between coils. ,Since the arrange
mentof the winding is similar to that of the usual
untapped winding, no extra insulation is required,
and the cost of the winding is not substantially
greater thanlthatof conventional windings.
.Other objectsgand vadvantages of the invention
willbe apparent from the following detailed de
scription, takenjn connection with the accom
eratingcycle, and which is.:provide.d .witha tapped
main primary winding, so that one sectionof the
winding can “be cutout when the high torque
islneededpthrusrin efleotrincreasing thevoltage on
the {remaining section of ,the winding and in
rallying drawing, . in which:
creasing the torque.
amainprimary winding ‘for .a sinsle-nhaseinduc
tionmotor embodying the inventiqn; and
jFig._2is aschematic diagram showing the elec»
trical connections ,of thelmotor.
The drawing shows the invention embodied in
Figure l is a diagrammatic developed view of
{The ,usual typeloftapped main winding, which
has been used :heretoforegonsists of two wind
ing-sections-having thesame number of coils and
the ‘same v{winding distribution, and disposed in
a single-phaseinduction motor of the split-phase
thesame-slots of the “stator, the only, difference in
the two 7sections being thatione section has a 35 type. Fig. ,1 shows themainprimary winding of
aiour-pole ,motor ,having thirty-six stator slots
smallerinumber of turns in each coil than the
other. lI‘hese two sections are connected in
and three coilsper .pole. The, stator ‘slots. are in
dicarted.diagrammaticallyin?ig. 1.by dotted lines,
series, with a-tap -_connection between the .two
sections, so :that the section having the ‘Smaller
number of turns can be cut out to- obtain in
creased torque. This type of vwin-ding :is; relative
lysaxpensive, ‘however, because it is not readily
40
and arenurrrbered from .1..to_3_6 inclusive. The
main primary winding only is shown in ‘this ne
urenthe auxiliaryorstarting winding being. omit
adaptabletozmachinewindingsand.mustsbewonnd
ted to avoid confusion,~since__any suitable type
of starting winding may .be used. ,Although a
intheslots by -hand,~since r-it consists essentially
oftwoicornplete windings which-must beinserted
four-.pole ,winding has been , shown, it will be ob
in the slots one .- after the other.
Thus, , a wind
‘ins {of- this type involves relatively high labor
cost. , Another disadvantaggenf this reonvuentional
type '_Of manned v:vvi-nding :is :thatein some parts .i of
the -~.-winding there 'is :nearly .Efull line ‘voltage .be
tween adjacent turns of different sections which
lie in the same slots, and 'it is rnecessa-ryqto .in
viQusthat the invention can {be applied to motors
having any desired number of :poles, and any
suitable number of stator slots. As shown .in
Fig. ,-1_,.each polegof the winding consists ofrthree
concentriccoils. Thus, the-?rst pole-at the left
of Fig. ,1 comprises ,a-coil lying in slots I and 9,
aicoil ,lying in slots 2 v‘and-l3, and a coil lying in
slots :8 and]. ‘The other threezpoles of thewind
sulateat-least onersection iortthe ;f.u11 line voltage,
ingareexactly similar,.wi_th adjacentspoles wound
‘thus; iurther inoreasinethe. cost.
in ‘opposite-directions in 1the;us.ua1 manner ‘to ob
The principal Object of themmentzinvention 5,5 tain ,ronnosite instantaneous polarities. single
2,508,143
4
3
turn coils have been shown to simplify the draw
ing, but it will be understood that in an actual
are cut and the coils connected in the manner
shown in Fig. 1. Even if wound by hand, there
winding each coil will usually have a relatively
fore, the cost of the new winding is considerably
large number of turns.
less than that of the previous type of tapped
In accordance with the present invention, the
winding is divided into two sections. One sec
tion consists of the two outside coils of each pole,
the corresponding coils of all the poles being con
nected in series. Thus, the two outside coils of
.'
the ?rst pole at the left of Fig. 1, which are con
nected to each other in series, are connected be
tween a terminal lead 40 and the two series
connected outside coils of the second pole, which
in turn are connected to the series-connected out
side coils of the third pole, and so on throughout 1.4 .1
the winding, the two outside coils of all the poles
thus being connected in series between the ter
minal lead 40 and a tap connection M. The in
side coils of all four poles are separately con
nected together in series between the tap con“
nection 4| and a terminal lead 42. It will be
apparent from Fig. I that all the coils are con
nected in series between the leads 40 and 42, so
that the winding is electrically equivalent to a
conventional untapped Winding, but that the
winding is divided into two sections 43 and 44,
the section 43 comprising the two outside coils of
all the poles, and the section 44 comprising the
inside coils of all the poles, with a tap connection
4| between the two sections.
The tapped main primary winding, consisting
of the two sections 43 and 44, is shown in. Fig.
2 in a single-phase motor of the split-phase type,
which also includes an auxiliary or starting
winding 45, which is physically displaced on the I
primary member or stator from the main primary
winding, and which is connected in parallel with
the main winding by means of a speed-responsive
switch 46 of any suitable type. The motor also
has a rotor member 41 carrying a secondary d 0
winding 48, which is shown as a squirrel-cage
winding. The motor is connected to a single~
phase supply line Ll, L2, preferably through a
line switch 49, and one side of the primary wind~
ing is shown as being connected to the line
through a selector switch 50, which may connect
the line alternatively either to the terminal lead
42 or to the tap connection 4|.
winding, while a much greater reduction in cost
is obtainable by machine winding, which could
not readily be done with the old type of Wind
ing. It will also be seen that no extra insulation
is required, since there are no high voltages be
tween adjacent turns in the same slots.
Thus,
a relatively inexpensive tapped winding has been
provided which avoids the disadvantages of the
tapped windings previously used.
A preferred embodiment of the invention has
been shown and described for the purpose of
illustration, but it will be understood that various
modi?cation-s and other embodiments are possi
ble. Thus, the invention may be applied to wind
ings having any number of poles and having other
winding distributions or numbers of coils.
The
invention is not limited to concentric coil wind~
ings, but may be applied to windings of other
types, and may be used in any type of single
phase induction motor. It is to be understood,
therefore, that the invention is not limited to
the speci?c arrangement shown, but in its broad
est aspects, it includes all equivalent embodi~
ments and modifications which come Within the
scope of the appended claims.
I claim as my invention:
1. A single-phase induction motor having a
main primary winding and an auxiliary primary
winding disposed on a slotted primary member,
said main primary winding being a twoesection,
multipolar winding, each pole of the winding
comprising a plurality of coils lying in different
slots, certain of the coils of each pole being con~
nected together and to the corresponding coils
of the other poles to form one section of the
winding and the remaining coils being separately
connected together to form the other section of
?e winding, means for connecting said two sec
tions in series, and a tap connection between the
two sections for cutting out the last-mentioned
section.
2. A single-phase induction motor having a
main primary winding and an auxiliary primary
winding disposed on a slotted primary member,
said main primary winding being a two-section,
In operation, the motor will usually operate
with the terminal lead 42 connected to the line, 50 multipolar windings, each pole of the winding
comprising a plurality of coils» lying in different
as shown in the drawing, so that the motor de
slots, all but one of the coils of each pole being
velops its normal torque and operates as a nor
connected together and to the corresponding coils
mal split~phase motor, the speed-responsive
of the other poles to form one section of the wind_
switch
disconnecting the auxiliary winding 45
ing, and the remaining coils being separately
from the line when the motor comes up to speed.
connected together to form the other section of
When a high torque is required for a short period,
the winding, means for connecting said two sec
however, the switch 56 is moved, either manually
tions in series, and a tap connection between the
or automatically, to connect the tap connection
two sections for cutting out the last-mentioned
4| to the line, thus cutting out the section 44 of
section.
the main winding and increasing the voltage on
3. A single-phase induction motor having a
the remaining section 43 of the Winding so that
main primary winding and an auxiliary primary
increased torque is obtained.
winding disposed on a slotted primary member,
It should now be apparent that a tapped main
said main primary winding being a two-section,
primary winding has been provided for single
phase induction motors which can be produced 65 multipolar winding, each pole of the winding
comprising a plurality of coils disposed concen
more easily and cheaply than the tapped wind
trically in different slots, certain of the coils of
ings which have been utilized heretofore. Thus,
each pole being connected together and to the
the new winding is readily adaptable to machine
corresponding coils of the other poles to form one
winding, since it diifers from an ordinary un
section of the winding and the remaining coils
tapped winding only in the connections between
being separately connected together to form the
coils, and can be wound in the same manner as
other section of the winding, means for connect—
an ordinary winding except that longer loops
ing said two sections in series, and a tap connec
than usual are provided between the inside coil
tion :between the two sections for cutting out the
and the intermediate coil of each pole. After
the winding operation is completed, these loops 75 last-mentioned section.
2,508,143
5
6
4. A single-phase induction motor having a
main primary winding and an auxiliary primary
winding disposed on a slotted primary member,
said main primary winding being a two-section,
6. A single-phase induction motor having a
main primary Winding and an auxiliary primary
winding disposed on a slotted primary member,
main primary winding being a two-section,
‘multipolar winding, each pole of the winding
multipolar winding, each pole of the winding
comprising a plurality of coils disposed concen
comprising a plurality of coils disposed concen
trically in di?'erent slots, the inside coils of all
trioally in different slots, the inside coils of all
the poles being connected together to form one
the poles being connected together to form one
section of the Winding and the remaining coils
section of the winding ’and the remaining coils
of each pole being connected together and to the 10 of each pole being connected together and to the
corresponding coils of the other poles to form the
corresponding coils of the other poles to form
other section of the winding, means for connect
the other section of the winding, means for con
ing said two sections in series, and a tap connec
necting said two sections in series, a tap connec
tion between the two sections for cutting out the
tion between the two sections, means for con
?rst-mentioned section.
15 necting the free end of the last-mentioned sec
5. A single-phase induction motor having a
tion to one side of a single-phase supply line,
main primary winding and an auxiliary primary
and means for alternatively connecting the other
winding disposed on a slotted primary member,
side of the supply line to the free end of the ?rst
said main primary winding being a two-section,
mentioned section or to said tap connection.
multipolar winding, each pole of the Winding
comprising a plurality of coils lying in different
slots, certain of the coils of each pole ‘being con
nected together and to the corresponding coils of
the other poles to form one section of the wind
ing and the remaining coils being separately con
nected together to form the other section of the
winding, means for connecting said two sections
in series, a tap connection between the two sec
tions, means for connecting the free end of the
JOHN C. BURDETT.
REFERENQES CITED
The following references are of record in the
?le of this patent:
Number
UNITED STATES PATENTS
Name
Date
661,464
1,933,497
2,203,927
?rst-mentioned section to one side of a single
phase supply line, and means for alternatively 30
connecting the other side of the supply line to
the free end of the other section or to said tap
Number
connection.
368,246
Aldrich et al. ____ __ Nov. 6, 1900
Morrill __________ __ Oct. 31, 1933
Rutherford ______ __ June 11, 1940
FOREIGN PATENTS
Country
Date
Great Britain ____ __ Aug. 29, 1930
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