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Патент USA US2405012

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July so, 1946.
s, BOUSKY '
TWO PHASE MOTOR‘
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Filed Jan. 17, 1944
26
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,8 44
,wromliy
Patented July 30, 1946
2,405,012
UNITED STATES PATENTpOFFICE
2,405,012
TWO-PHASE MOTOR
Samuel Bousky, Shaker Heights, Ohio, assignor,
by mesne assignments, to Jack & Heintz Pre
cision Industries, Inc., Cleveland, Ohio, a corpo
ration of Delaware
Application January 17, 1944, Serial No. 518,539
4 Claims.
(Cl. 172—120)
2
This invention relates to two phase electric
motors.
The general object of the invention is to pro
vide a novel improved construction for two phase
motors, which is extremely simple and economical
to manufacture, and which is especially suited
All the projections I‘! are therefore of similar
polarity at any instant, and likewise the projec
tions I8 have a common polarity. Thus, when the
coils 5 and 6 are energized from the respective
phase of a two phase alternating current sup
ply, the projections I‘! and I8 constitute active
pole tips effective to produce a rotating magnetic
ratings.
?eld around the rotor. The number of projec
These and other objects and advantages reside
tions may be selected to produce the rotational
in the novel construction of parts, the combina 10 speed desired.
tion thereof, and the mode of operation, as will
The ?eld pieces I and 2 are maintained in the
become apparent as the speci?cation proceeds in
correct relationship and alignment by a cylin
to miniature motors of very small size and power
connection with the accompanying drawing in
drical outer casing 20 having internal grooves 2I
which:
extending longitudinally thereof. The projec
Figure l is a longitudinal sectional view through 15 tions I7 and I8 and the raised ribs 22 and 23 ex
a preferred embodiment of my novel construc
tending in continuation thereof, lie in alternate
grooves 2 I. Each ?eld piece has an end ?ange or
tion;
Figure 2 is an elevational view with part of the
rim 2-2 extending between the raised ribs. If the
casing broken away to show the ?eld pieces and
?eld piece is formed by a casting process this
20 ?ange may be cast integrally therewith, as shown,
rotor;
Figure 3 is a cross sectional view taken on the
and if the ?eld piece is machined from tubular
line 3—-3 of Figure 1; and
stock the flange 24 may take the form of a ring
Figure 4 is a cross sectional view taken on the
pressed on so as to be rigidly united therewith.
line 4—4 of Figure 1.
The lands 25 between the grooves 2! are ter~
Referring more particularly to the drawing 11“ 25 ininated short of the ends of the housing 2% to
lustrating a preferred embodiment of the vinven
provide thin walled end portions 26, 28 for re
tion, the numerals I and 2 indicate a pair of
ceiving the flanges 24, 24. In assembling the
identical magnetic ?eld pieces having oppositely
disposed and inwardly directed cup-shaped coil
recesses 3, and oppositely disposed and outwardly
directed bearing recesses 4. The coil recesses con
tain phase windings 5 and 6, each comprising a
single coil of wire. A pair of bearing assemblies
motor the ?eld pieces may be inserted in both
ends of the housing 20 as far as they will go, with
which
?anges will
24, properly
24 abutting
position
the the
endsprojections
of lands H
and I8 longitudinally with respect to each other
and the rotor. The ends of the motor are closed
1 in the respective bearing recesses mount a rotor
and sealed and the bearing assemblies are re
Ill concentrically with the two ?eld pieces, the to L1 tained in their recesses by means of plates 2? and
rotor having an enlarged cylindrical central por
28 over which the extremities of the thin walled
tion I I with tapering end portions I2, I2 one of
ends 25,. 25 of the housing may be spun or staked
which terminates in an external shaft portion I3.
as shown at 29. Connections for the coils 5 and B
The coil recess 3 in each pole piece is seen to be
may be brought out through the side or ends
bounded on the outside by a cylindrical wall por 40 of the housing 20.
tion I4, and on the inside by a central cylindrical
The rotor II may be made of a solid piece of
wall portion I5 de?ning an opening I5 to accom
iron, or other magnetic and electrically con
modate one of the tapered ends I2 of the rotor.
ducting material, but it is preferred to use an iron
The external wall portion I4 of the ?eld piece I
rotor with a squirrel cage of copper or other elec
is extended in a plurality of spaced projections
trically conducting material as shown. In the
or pole pieces I‘! of a length to overlie and enclose
present embodiment the central portion II is
the central portion I I of the rotor, and the ?eld
drilled or slotted near the periphery to receive
piece 2 is similarly provided with a plurality of
spaced projections I8 disposed in inter?ngered
copper wires 3!}, and the faces of the portion I2
are recessed to accommodate copper rings 3I to
relation with the projections ll in the manner
shown in Figure 2.
Energization of the coil in a ?eld piece pro
duces at any given instant a magnetic pole in
the central portion I5 and an opposite pole in the
which the ends of the wires are soldered or brazed,
The present construction is simple and inexpen
sive, requiring but few parts which may be easily
assembled by unskilled persons, and provides a
rugged design which is especially suited for mak
outer wall I 4 carrying the projections I1 and I8. 65 ing very small motors. It is of particular ad
2,405,012
3
vantage in making miniature motors that each
phase winding requires only a single coil which
posite magnetic poles, a coil in the cup space
between said rims, pole tips on said outer rim,
rotor bearings in said ?eld pieces, a rotor of
may be preformed to ?t the coil recess 3, regard
magnetic material supported in said bearings,
less of the number of ?eld poles desired. Another
feature of advantage in attaining simplicity of U! said rotor having an enlarged central portion dis
posed between said ?eld pieces in operative rela
design and economy of construction is the end
tion with said pole tips and elongated end por
for-end symmetry wherein the pole pieces, bear
tions of abruptly reduced diameter and dimin
ings and coils are identical in the two ends and
ishing in diameter outwardly and terminating in
are held in assembled relation by identically
formed deformations at the ends of the casing, 10 end shaft portions supported in said rotor bear
ings and extending through said ?eld pieces and
whereby the number of different parts and manu
closely adjacent said inner rims throughout sub
facturing operations is greatly reduced.
stantially the entire length of said end portions
It is of course appreciated that the desired
with end clearance for the main body portion of
quadrature phase displacement between the cur
rents in the coils 5 and 6 may be obtained either 15 said rotor so as to establish magnetic circuits
by connecting them directly to a two phase sup
ply or by utilizing known systems for obtaining
two phase current from single or three phase
through said rotor, a cylindrical casing surround
ing said assembly to hold the ?eld pieces in the
speci?ed relationship.
3. A motor construction comprising a pair of
supplies. The nature of the supply source is im
opposed, axially aligned ?eld pieces, each ?eld
material to the present invention, provided that
piece being of cup shape with an annular base
two phase current is ultimately fed into the coils
having inner and outer rims constituting op
5 and 6.
posite magnetic poles, a coil in the cup space
Various changes may be made in the construc
between said rims, pole tips on said outer rim,
tion and arrangement, and it is intended that
all such modi?cations be included in the in 25 a rotor bearing in each annular base, a rotor of
magnetic material supported in said bearings
vention, same being limited only by the scope
said rotor having an enlarged central portion
of the appended claims. It will also be appreci
disposed between said ?eld pieces in operative
ated that the inherent advantages of the present
relation with said pole tips and elongated end
construction may be obtained in large as well
as in miniature machines, and it is to be under 30 portions of reduced diameter extending through
said ?eld pieces and closely adjacent said inner
stood that reference is herein made to the latter
rims so as to establish magnetic circuits there
only for purposes of illustration, and not for pur
through, external splines on said outer rims, and
poses of limitation.
an internally splined tubular casing for receiving
I claim:
1. A motor construction comprising a pair of 35 said ?eld pieces and maintaining them in ?xed
relationship,
opposed, axially aligned ?eld pieces, each ?eld
4. A motor construction comprising a pair of
piece being of cup shape with an annular base
having inner and outer rims constituting opposite
opposed, axially aligned ?eld pieces, each ?eld
piece being of cup shape with an annular base
magnetic poles, a coil in the cup space between
said rims, pole tips on said outer rim, motor 40 having inner and outer rims constituting 0p
posite magnetic poles, a coil in the cup space
bearings in said ?eld pieces, and a rotor of mag
between said rims, pole tips forming external
netic material supported in said bearings, said
splines on said outer rim, an annular ?ange
rotor having an enlarged central portion disposed
around said base between said splines, rotor bear
between said ?eld pieces in operative relation
ings in said ?eld pieces, a rotor of magnetic ma
with
pole tips and elongated end portions
terial supported in said bearings, said rotor hav
of appreciably reduced diameter and diminish»
ing in diameter outwardly and terminating in
end shaft portions supported in said rotor bear
ings and extending through said ?eld pieces and
closely adjacent said inner rims throughout sub
stantially the entire length of said end portions
with end clearance for the main body portion of
said rot'or so as to establish magnetic circuits
through said rotor.
2. A motor construction comprising a pair of
opposed, axially aligned ?eld pieces, each ?eld
piece being of cup shape with an annular base
having inner and outer rims constituting op
ing an enlarged central portion disposed between
said ?eld pieces in operative relation with said
pole tips and elongated end portions of reduced
diameter extending through said ?eld pieces and
closely adjacent said inner rims so as to estab
lish magnetic circuits therethrough, and
in
ternally splined tubular housing having unsplined
end portions receiving said ?eld pieces in op—
posite ends thereof with said ?anges occupying
said unsplined portions and abutting the splined
ends to maintain the parts in ?xed relationship.
SAMUEL BOUSKY.
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