Abstract: A disc type brushless motor comprising a rotor provided with a field magnet having two or more poles, and a stator on which loop-like armature windings are flatly positioned opposite to the field magnet in quantity of two or more in the circumferential direction and in two stages or more in the radial direction. The stator is also provided with elements for detecting the poles of the field magnet. The armature windings are positioned so that they do not overlap in either the circumferential or the radial directions of the stator. One terminal of each armature winding is connected to a common line and the other thereof to a semiconductor rectifier. Each pole of the field magnet may consist of a plurality of segments in the form of a fan-like plate or a square plate.

Abstract: A coil winding configuration for a three phase winding, connected in a delta configuration, for the stator of an alternator for providing a high output at low engine rpm. Each phase winding comprises 14 coils which are located in 14 slots of a 42 slot stator with 9 turns in each slot. The 14 coils of each phase winding have the following number of turns at one edge: 4, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4. In addition, the 14 coils of each phase winding have the following number of turns at the other edge: 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5.

Abstract: An electromechanical transducer has a coreless rotor or stator winding formed of a series of flat band loops, in case of a long or short cup-shaped cylindrical winding, each of the loops having an active portion inclined to both the axial and tangential direction of the rotor or stator winding and an inactive bowstring portion oriented perpendicular to the axial direction thereof. In case of a nearly flat disc or dish shaped rotor or stator winding, each of the loops has a main active portion at a top or bottom portion of the winding, the active portion being perpendicular to the axial direction of the winding. An output torque to be generated therefrom an effective magnetic flux area and density is improved.

Abstract: A DC cored motor in which the rotor core has an odd number of slots to accept a corresponding number of coils which are connected to a commutator with a doubled number of segments, characterized by a combination of 2n+1 slots with 2n magnetic poles in the field magnet, wherein n is an integer equal to or larger than 2.

Abstract: For the desired pole-pair number combination p.sub.1 /p.sub.2 always those coils are omitted from the individual phases of the first pole-pair number p.sub.2, which form overlapping phase bands for the second pole-pair number in the coil side star; the remaining coils of each phase for 2p.sub.1 are distributed symmetrically along the periphery and in accordance with ##EQU1## over the base-speed winding connected in three-phase wye/three-phase wye configuration and the dead winding branches N.sub.1, connected in parallel or in series to it, for the first pole-pair number p.sub.1, whereby at least a large portion of the omitted coils is configured as additional dead branches for the second pole-pair number p.sub.2.

Abstract: A rotary electric machine including a stator in which a rotor is journalled. Coolant passages for a rotor winding are defined by the interstices between precision wound turns and winding layers to assure uniform distribution of coolant during operation to avoid mechanical balance problems and uniform cooling of components to assure long life.

Abstract: An improved magnetic core element for use in an electrodynamic rotary machine. The core element, either a stator or rotor depending upon the design of the machine, is provided with a slot distribution such that when the rotor rotates with respect to the stator and a balanced energy field is provided therebetween, at least the lowest generated harmonics, will be substantially zero.

Abstract: There is provided a three-phase flat coil having a disclike outer periphery of an insulating plate and an electrical conductor positioned radially on front and back sides of said insulating plate and having bent-over portions on outer and inner peripheries thereof. Said electrical conductors are the three-phase coil windings including a-phase, b-phase and c-phase windings each wound in a wave form in the same direction and terminating at output terminals on the outer periphery of said plate. The output terminals are located at substantially one point on the outer periphery of said plate. The ends of the b-phase winding at said output terminals are different in polarity from the ends of the a-phase and c-phase windings. Intersections of the said three-phase coil windings are collectively positioned at substantially one point on the outer periphery of said insulating plate.

Abstract: The back EMF generated in armature coils is substantially balanced by causing the coils located a greater distance from the axis of rotation of the armature to have fewer turns than the coils located closer to the armature axis of rotation. Alternatively, rather than decrease the number of turns in the coils, the same balancing affect can be achieved by increasing the electrical resistance of the coils located a greater distance from the armature axis of rotation.

Abstract: A stator winding configuration employs graded, overlapping stator winding coil groups. The outer coils of the coil group have a reduced number of turns with respect to the center coil or coils of the group. The coil groups have an expanded coil group width. The outer coils of adjacent, expanded width coil groups are overlapped by placing the reduced turn outer coils in common slots in the stator core.

Abstract: A simplified static excitation system for a fluid-cooled dynamoelectric machine comprises a potential source excitation winding disposed in the stator slots, the winding being responsive to the fundamental frequency of the generator air-gap magnetic flux. The excitation system further comprises transformer means coupling the excitation winding to rectification means which is coupled to the rotating field windings so as to provide direct electric current thereto. The transformer means is preferably disposed within the cooling fluid of the machine.

Abstract: A coil for use in a coreless motor comprises a flat disc shaped portion in which a coil wire extends between two peripheral points which are spaced 180.degree., coil turns of the coil being successively displaced in a peripheral direction, and a cylindrical portion in which the wire is disposed to interconnect portions thereof at the peripheral edge.The coil is manufactured by a winding machine having a winding head including a first disc and a freely rotatable second disc. The second disc has a diameter slightly larger than that of the first disc and acts as a guide. Each turn of the coil is wound across the upper surface of the winding head and about the same for about 180.degree.. Adjacent turns are successively displaced a little in the peripheral direction. After winding, the coil is shaped into a cup shaped configuration.

Abstract: A single phase alternating current electric motor is provided with a main stator winding having two coil groups each including the series connection of three coils. These coil groups can be connected in series for six pole operation and in parallel for four pole operation. The coils are approximately equally spaced around the periphery of the machine but are not of equal numbers of turns. The two coil groups are identically wound and spaced 180 mechanical degrees apart. One coil of each group has more turns and a greater span than the other two coils.

Abstract: Herein disclosed is an ironless rotor winding for a cup-shaped electric motor. A winding portion is wound through one terminate face of an imaginary column. Another winding portion is wound onto the periphery of the imaginary column at an angle of inclination with respect to the axis of revolution of the column. A further winding portion is wound at the other terminate face of the imaginary column along the peripheral edge of the column. Thus, the overall rigidity of the ironless rotor winding can be increased. In an alternative, the winding portion wound onto the circumference of the imaginary column at an angle of inclination with respect to the axis of revolution is composed of a first segment having a smaller angle of inclination, and a second segment having a larger angle of inclination. Herein also disclosed are method and machine for making the such ironless rotor winding.

Abstract: This invention relates to a coil unit of coreless armatures. Inner and outer cylindrical coils formed of parallelly arranged coil element wires of an equal length are fitted and combined with each other and overlapping parts thereof are joined sequentially to form electrically closed loops. The thickness in the radial direction of the coil unit is made uniform by means of the foregoing formation. Also, as the length per turn of the coil element wires becomes uniform, a coil unit excellent in the dynamic balance can be obtained and, further, the shape of the cross-section of the coil element wires can be made proper with the cross-sectional area made constant, so that motors of different numbers of turns can be easily designed.

Abstract: An armature winding assembled in an armature core is formed by concentrically continuously winding a plurality of coils having respectively different coil pitches. The starting-end and terminating-end terminal conductors of the plural concentrically continuously wound coils are led out along the opposite coil sides respectively of the coil having the longest coil pitch among the plural coils.

Abstract: An improved direct-current electrical dynamotor wherein the brushes are sufficiently wide to simultaneously abut a multiplicity of commutator segments. The winding sections extend independently from one commutator segment to a commutator segment that is approximately 180 electrical degrees away whereby the brushes each simultaneously collect a plurality of currents induced in the winding sections extending to the commutator segments abutted by the pair of positive and negative brushes. Each pair of brushes is installed on each side of the magnetic neutral. All of the coil sections are completely independent of each other with no electrical interconnections aside from the commutator brushes.

Abstract: An automatic feedback and control system for operating a load off of a multi-phase rectified rotary field system of a motor vehicle and for increasing the voltage and current to the load upon demand. The multi-phase rectified rotary field system comprises a rotatable coil for forming the rotary field when excited and stationary windings having an output coupled thereto by way of rectifier means. A DC power supply is coupled to said output. A regulator is provided having an input coupled to the DC power supply and and output coupled to the rotatable coil. Non-polarized capacitors are provided and a switch is coupled to the capacitors and to the DC power supply. The switch when closed, electrically connects the capacitors between the stationary windings and the rotatable coil and electrically connects the DC power supply to the rotatable coil.

Abstract: A three-phase winding for numbers of poles 2p=4 comprises "with" and "counter" coil groups which are arranged asymmetrically and connected in series in such a way that there is no change of the maximum voltage present at the phase transitions, where this maximum voltage is determined for numbers of pole pairs 2p=6 by the sum of the absolute values of the adjacent potentials .vertline.U.sub.1 .vertline.+.vertline.U.sub.2 .vertline.=(3p-1) U.sub.SG with a corresponding minimum value of U.sub.1,2 =(p-1) U.sub.SG where U.sub.SG is the coil group voltage. The six winding ends (U, V, and W; X, Y and Z) are arranged physically side-by-side within a pole pair, and, in general, at most only four or six wiring connections need to be installed, only at two short respective circumference zones side-by-side.

Abstract: A starter motor field winding assembly comprises a stator ring, plural pole pieces on the ring, and a field winding comprising an uninterruptedly continuous conductor wound to encircle the pole pieces. The conductor comprises strapping edge wound about cores to form coils. The strapping between coils is edge bent to form connections from one coil to the next. The cores about which the coils are formed may be affixed to an arbor or may be removably mounted on the arbor and thereafter assembled to a stator ring to form the pole pieces of the completed stator assembly.

Abstract: A direct current motor comprising a field magnet provided with 2 mn magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where m is an integer of 1 or more, and n is an integer of 3 or more; a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet; an armature in which m(2n.+-.1) armature coils are arranged with an equal pitch, the armature being directed towards the magnetic poles in the magnetic circuit; electric power supply control device capable of performing the switching of armature current 2 mn (2n.+-.1) times per revolution of the armature; and a rotating shaft for rotatably supporting the armature and one of the magnetic poles, the rotating shaft supported by a bearing disposed in an outer casing of the direct current motor.

Abstract: This invention provides a DC multi-pole electrodynamic device, specifically a cup type DC multi-pole coreless motor having fixed field magnets, a magnetic material for closing the magnetic circuits of the field magnets, an armature composed of armature coils constructed of a plurality of loops, each having successive active armature portions adjacent to successive ones of said fixed magnetic field poles, respectively, the armature coils being formed by winding a conductor in substantially the same circumferential direction a predetermined number of times, the armature coils being formed by winding said conductor periodically in opposite axial directions with respect to magnetic poles without forming adjacent physically closed coils, the armature having coil taps equal to half the number of magnetic pole pieces, a commutator having commutator segments electrically connected to said coils, and a set of two fixed brushes.

Abstract: A minimum loss multilayer solenoid for induction heating is characterized by the ampere-turns carrying the same current per conductor from one layer to the next on account of the dimensioning of the conductors having width and thickness varying monotonically in opposite directions across the layers. Central cooling for the conductors is accommodated in the parallel layers with sectional distribution of the cooling medium.

Abstract: A star (wye) connected air gap polyphase armature having limited voltage differences between physically adjacent coil windings at the phase boundary for the different phase circuits. The unconnected lead of the coil or coils at the first edge of the phase belt region forms the neutral terminal for connection of the phase winding in a star or wye circuit comprised of other similarly formed phase windings, and the unconnected lead of the last coil or coils remaining at the middle of the phase belt region forms the line terminal for the multiple coil phase winding to thereby minimize voltage differences between turns of physically-adjacent phase windings at the phase boundaries.

Abstract: A direct current motor comprising a field magnet provided with 2n magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where n is an integer of 1 or more; a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet; a plurality of armature coils in such a manner that the angular intervals of the electrically conductive portions thereof, contributing to the generation of torque in the armature coils, are substantially equal to the magnetic pole width of the field magnet; electric power supply control device to which the terminals of the armature coils are connected; short-circuit members for short-circuiting the winding initiation terminals of predetermined armature coils and the winding end terminals of other predetermined armature coils through the electric power supply control device; an armature comprising armature coils in the first series and armature coils in the second series through which the short-circuit members

Abstract: A pole change type motor has armature windings wound around an iron core in a coaxial fashion with a P (for example 2) number of poles for a high speed operation, which armature windings provide a Q (for example 20) number of poles for a low speed operation by changing the external connections of the windings. Each phase coil of the armature windings is segmented into N (for example P, the same number as the poles) portions, a one-pole portion of each phase coil being comprised of a plurality (for example 2) of coils. The plurality of coils include one or more coils of which polarity is changed by changing the external connections of the armature coils and one or more second coils alternately disposed with respect to the first coils, of which the polarity is left unchanged by changing the external connections.

Abstract: A rotating electric machine provided with coils of various phases constituting 3-phase armature winding which are divided into first and second groups or circuits. A first circuit formed of selected sub-groups of coils of various phases is energized at the start of the electric rotating machine. A second circuit is formed of the remaining coils of various phases which are so connected as to generate an induced electromotive force having an equal magnitude to that which is produced in the first circuit. Said second circuit is connected in parallel with the first circuit to be energized at the full drive of the rotating electric machine.

Abstract: A cylindrically-shaped multilayered coil structure comprises a plurality of diagonally wound coil sections extending circumferentially around the coil. Each section includes inner and outer layers. Each such layer includes initial and final turns. During winding of the coil, after the final turn of an inner layer is wound, the coil wire is wound to form a crossing part which extends back to the initial turn of the inner layer of that same section. Winding of the outer layer of that section is then performed. Subsequent coil sections are wound in a similar manner. The crossing parts are sandwiched between the respective inner and outer layers and comprise continuous unbroken sections of the coil wire.

Abstract: A direct current motor is provided with a field magnet having 4 mn alternating N and S poles (m being a positive integer of one or more and n being a positive integer of two or more) that are magnetized within segments of equi-angular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and a rotatably mounted armature having m (2n-1) armature windings equally distributed thereabout in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of the field magnet poles.

Abstract: A unique coil winding configuration for a three phase winding connected in a Y configuration for the stator of an alternator for providing a high output at low engine rpm. Each phase of the winding comprises 14 coils which are located in the slots of a 42 slot stator with 5 turns in each slot.

Abstract: A coil winding configuration for a three phase winding connected in a Delta configuration for the stator of an alternator for providing a high output at low engine rpm. Each phase of the winding comprises 14 coils which are located in the slots of a 42 slot stator with 8 turns in each slot. Each of the windings is formed of 14 A.W.G. electrically conductive wire.

Abstract: A single phase motor is disclosed which comprises a stator assembly having a main winding, a start winding and an auxiliary winding wherein the start and auxiliary windings are connected in two alternative configurations during start and run conditions, respectively. During the start condition, the start and auxiliary windings are interconnected by a series connection which causes current to flow through the auxiliary winding in a reverse direction to the flow through the start winding so that there exists a bucking magnetic relationship between the fields in the start and auxiliary windings. During the run condition of the motor, however, the start and auxiliary windings are interconnected by a second series electrical connection which causes the current to flow through the auxiliary winding in a direction opposite the first direction so as to cause the magnetic fields in the start and auxiliary windings to be in an aiding relationship thereby improving motor operating efficiency.

Abstract: A three phase winding for a high voltage machine with Y connected legs, whose coil groups, disposed on the circumference so as to be cyclically distributed, consist of series connected coils alternatingly energized in the opposite sense, has its size and copper requirements reduced by providing as many coil groups with the same direction of the magnetic flux and direction of increase in potential as there are coil groups of opposite direction of the magnetic flux and direction of increase in potential with the groups so distributed over the circumference and interconnected lengthwise that, at most, the phase voltage is applied to the phase transitions between adjacent coil sides.

Abstract: A pole-amplitude modulation (P.A.M.) three-phase, pole-number changing machine having star-connected and delta-connected stator winding components, thereby providing additional means for reducing m.m.f. harmonics in the resultant three-phase field. Pole-number changing is effected by reversing the star-connected winding component relatively to the delta-connected component.A design method defines relationships between alternative pole-numbers and stator slot number, and slot-spacing between star- and delta-connected components.

Abstract: In a polyphase machine, being either a motor or a generator, there is provided a stator core having main stator windings wound about the stator core and main windings having a capacitor connected in series with each winding of the core. Switches are provided for each winding, and a trigger source for the switches operates with the capacitor and windings to ensure sequential current flow in opposite directions across the windings. Variable frequency pulses from a trigger results in a variable speed machine. With control windings wound on the stator, oppositely to the main windings there are currents in each phase which are substantially in-phase at no load with the currents of the corresponding radially adjacent the main windings. Such currents become out of phase with their main winding currents as the load increases. At low load the net flux density is low and as the load increases the flux density increases.

Abstract: The present invention relates to a slotless, brushless motor comprising a permanent magnet rotor rotationary together with a shaft and a stationary armature coil disposed in opposition to the rotor.The armature coil comprises a coil portion concentrically wound, an adjacent coil portion formed in sequence from the coil portion and concentrically wound, a coil performed on a plane by a plurality of the coil portions, N coils (N is integer) laid on each other and different in a phase respectively, sheets disposed between said N coils and a supporting member supporting the coils and the sheets made integral.

Abstract: An armature winding distribution for an electric motor divides each armature coil into first and second coil sub-sections inter-distributed with one another so that the first and second coil sub-sections of an armature coil undergoing commutation at one of the brushes are coupled, respectively, to the coil sub-section of an armature coil about to undergo commutation by the other brush and the coil sub-section of another armature coil having just completed commutation by the other brush. Excess energy in the armature coil undergoing commutation by the first-mentioned brush is transferred to a coil sub-section of the coil just about to undergo commutation and/or a coil sub-section of the coil having just completed commutation by the other of the brushes. The armature winding distribution improves commutation and substantially reduces brush sparking and the generation of electromagnetic interference (EMI) across a wide range of frequencies.

Abstract: A coreless rotary electric appliance comprising a rotary coil of a cup-shaped coil body open at an end face thereof which is composed of inclined coil wire portions wound with a determined angle along the cylindrical periphery of said coil body and of end connecting wire portions arranged on one end face of said coil body to connect said coil wire portions in succession whereby said coil body being formed by a continuous wire composed of said coil wire portions connected in succession by said end connecting portions, whereby said coil body being featured by an asymmetrical structure that two coil wire portions connected to both ends of each end connecting wire portion and wound along the cylindrical periphery of said coil body are provided with different inclination angles with respect to the generatrix of said cylindrical surface of the coil body.

Abstract: A two speed, single phase electric motor having a stator assembly including a main winding and a supplemental winding. Each of these windings includes a pair of coil sets. The main winding coil sets and the supplemental winding coil sets are so connected to a source of electrical power such that during high speed operation of the motor the number of effective turns is the sum of the turns in one main winding coil set and its supplemental winding coil set, and during low speed operation, only the turns in the main winding coil set are energized so that there are fewer effective turns. Thus, by varying the number of turns included in the supplemental winding coil sets while keeping the total number of effective turns in the main winding and supplemental winding constant, the low speed breakdown torque of the motor may be preselected during the design of the motor to be less than, equal to, or greater than a desired high speed breakdown torque.

Abstract: The polyphase stator winding of a dynamoelectric machine consists of a plurality of coils circumscribed about one another. Each coil has at least one end turn which includes two coil sides and a C-shaped connector ring that joins the coil sides together. The coil sides are straight conductors, or ones that are slightly bent on each end, and are embedded within the stator slots and extend into the end basket region of the machine where they are joined together by the C-shaped connector rings.

Abstract: The coil structure for a discoidal winding for use in an axial gap dynamoelectric machine includes a continuously wound substantially flat annular disc portion containing the active coil sides and toroidal-shaped inner and outer ring portions formed by the inner and outer head turn portions respectively for the coil structure. The inner and outer toroidal-shaped ring portions are divided into a plurality of complementary, annular helically-shaped segments that are fitted together to form the complete coil structure having toroidal-shaped inner and outer circumferential ring portions, which define the inner and outer circumferential edges, respectively, of the discoidal winding, separated by the annular disc portion containing the active coil sides.

Abstract: Herein disclosed is an ironless rotor winding for a cup-shaped electric motor. A winding portion is wound through one terminate face of an imaginary column. Another winding portion is wound onto the circumference of the imaginary column at an angle of inclination with respect to the axis of rotation of the column. A further winding portion is wound at the other terminate face of the imaginary column along the circumferential edge of the column. Thus, the overall rigidity of the ironless rotor winding can be increased. In an alternative, the winding portion wound onto the circumference of the imaginary column at an angle of inclination with respect to the axis of rotation is composed of a first segment having a smaller angle of inclination, and a second segment having a larger angle of inclination. Herein also disclosed are method and machine for making the such ironless rotor winding.

Abstract: A direct current motor is provided with a field magnet having l(2m+2n) alternating N and S poles (l and m being positive integers of one or more and n being a positive integer of two or more) that are magnetized within segments of equiangular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and an armature having l(2n-1) armature windings distributed thereon in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of a field magnet pole.

Abstract: A direct current motor is provided with a field magnet having l(2m+2n) alternating N and S poles (l and m being positive integers of one or more and n being a positive integer of two or more) that are magnetized within segments of equiangular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and an armature having 2ln armature windings distributed thereon in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of a field magnet pole.

Abstract: A dynamoelectric machine having a low A ratio during its starting mode and a high A ratio during its running mode. During the starting mode of the dynamoelectric machine, an auxiliary winding serially connected in bucking relation with a phase winding is excited therewith across a main winding. Generally as the dynamoelectric machine is energized to a predetermined speed indicative of the occurrence of its running mode, the phase winding and the bucking auxiliary winding are electrically disassociated, and another auxiliary winding serially connected and arranged in additive relation with the phase winding is excited therewith across the main winding.A method of operating a dynamoelectric machine and a circuit are also disclosed.

Abstract: A dynamoelectric machine, of the direct current type, with a circumferentially segmented stationary magnetic field structure providing magnetic poles including diametrically opposed pairs of north and south poles, with intervening poles of alternating polarity; rotor conductors extending longitudinally and selectively interconnected in sets providing a plurality of series current paths each traversing a plurality of stator active pole regions; and a pair of brushes for current collection at one or both machine ends.

Abstract: The efficiency of a multi-speed motor is optimized for the speed at which the motor is to be most frequently operated by first predetermining the expected most frequently used motor speed and then forming a start winding having a number of starting poles corresponding to the expected most frequently used motor speed from conductor material having a greater cross-sectional area than that of the conductor material employed in such a motor previously. The start winding is placed in selected slots of a stator core already containing a main winding so as to be in quadrature with the effect of the main winding when the main winding is connected in the most frequently used speed configuration.

Abstract: The present invention relates to a pole-changeable three-phase winding for p.sub.1 :p.sub.2 =(3m.+-.1)/3n (m and n being integers). This eliminates coils for the primary pole pair number p.sub.1 in the base winding branches and the parallel-connected null winding branches which are active only in this level. The same number of additional coils with reduced turn number are additionally series-connected between the terminals of the secondary pole pair number p.sub.2, so that at constant effective turn number w.sub.1 times the winding factor .xi..sub.1 a reduction of the copper losses is achieved.

Abstract: A refrigerant compressor of the type driven by a single phase motor capable of operating at a low speed and a high speed. The motor, including four separate windings, a first set of high-speed two-pole auxiliary and main windings, and a second set of low-speed four-pole auxiliary and main windings all wound on the same stator core. Each set of windings is provided with independent line break protectors that enable each set of windings and protector to be optimized without affecting the other. A mandatory low-speed start system is incorporated that insures initial low-speed start even when conditions require high speed operation. Speed switching from one speed to the other is accomplished in the present system while the motor is running without causing interruption of compressor operation.

Abstract: An electric two motor drive is disclosed in which the field winding of a commutator motor having few poles and the stator winding, distributed in slots, of an induction motor having a larger number of poles are both arranged on a common stator lamination stack. The field winding is wound around part of the circumference of the stator lamination stack in the manner of a concentrated ring armature winding. Either a closed or an open stator lamination stack may be provided.The invention is applicable particularly to a two speed motor drive for an automatic washing machine having a single lamination stack for the series and induction motor windings.