Патент USA US2405012код для вставки
July so, 1946. s, BOUSKY ' TWO PHASE MOTOR‘ ,mggmz ' Filed Jan. 17, 1944 26 ” ,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.