Abstract: In an embodiment, an actuator includes a plurality of stator windings adapted to produce a first stator magnetic field that translates along a stator axis, and to produce a second stator magnetic field that rotates around the stator axis. In addition, the actuator includes a rotor, coupled to a shaft, and positioned within a central stator channel. The rotor is adapted to produce a first rotor magnetic field that translates along a shaft axis and to produce a second rotor magnetic field that rotates around the shaft axis. An actuator system includes an actuator and an actuator controller unit, which is adapted to produce actuator inputs. An embodiment of a method for controlling the actuator includes providing actuator inputs to produce a translating magnetic field in the stator, a translating magnetic field in the rotor, a rotating magnetic field in the stator, and a rotating magnetic field in the rotor.

Abstract: Winding is wound around each of a plurality of core arm portions formed integrally with a core cylinder portion of a stator core. Windings wound around the respective core arm portions are 3-phase-configured such that one end of winding of each phase extends outwardly as an output wire, three output wires in total, and such that the other end of winding of each phase is connected at a common node, thereby establishing Y-connection. Two of the three output wires are fixedly pressed by crossover wires extending between windings wound around the respective core arm portions, whereas the remaining one output wire is fixedly pressed by a winding end wire of winding of an adjacent phase.

Abstract: In a rotary electric system, a rotary electric machine is provided with an armature core and star-connected multiphase windings with a neutral point wound in the armature core. Each of the star-connected multiphase windings has a predetermined winding configuration that prevents, when a zero-phase current is supplied from a direct current power source to the star-connected multiphase windings via the neutral point, a zero-phase magnetic flux created in the armature core based on the zero-phase current flowing in each phase winding of the star-connected multiphase windings from being cancelled out by a zero-phase magnetic flux created in the armature core based on the zero-phase current flowing in another one phase winding of the star-connected multiphase windings.

Abstract: An exemplary embodiment provides an electrical machine apparatus that includes a rotor coupled to an armature and a stator surrounding the rotor. The stator has a series of coils; the series of coils configured into a first group of coils and a second group of coils, the first group of coils electrically and magnetically isolated from the second group of coils. The electric machine is capable of simultaneously acting as an electric motor and generating electricity as an alternator.

Abstract: An axial gap EDM deploys as a stator coils a series of two parallel serpentine windings that each circumscribe an arc segment of a circle. Each arc segment that forms the stator winding assembly is powered as a separate phase. The two winding are readily formed by shaping one or more wire segment. Preferably the parallel winding are arranged to overlap with a half period rotational offset such that the radial directed serpentine segments of that are disposed above and below the stator disk are interlaced when viewed in projection through the disk. In one embodiment, each series of serpentine winding are separated by a gap so that they can be inserted on the stator disk from the edge. A separate rotor disk is adjacent each side of this stator disk. In another embodiment, each series of serpentine winding are separated by a gap, so they can be inserted to surround a single rotor disk which has two series of magnets disposed on opposite sides.

Abstract: The electrical machine (1) has a stator (2) and a rotor (5), wherein the stator (2) has stator slots (8), in which a stator winding (4) with redundant and at least three-phase winding systems (U1, V1, W1; U2, V2, W2) is laid. According to the invention, the electrical machine (1) has a large number of poles with a pole number (PZ) of at least four, a number (NZ) of stator slots (8) which corresponds to the product of a phase number and the square of the pole number (PZ) of the electrical machine (1) or an integral multiple thereof, and a number of winding systems (U1, V1, W1; . . . ; U4, V4, W4) which corresponds to the pole number (PZ). In each case a number of in-phase winding sections (U1-U4, V1-V4, W1-W4) which corresponds to the pole number (PZ) are combined to form a group of phase winding sections (PU, PV, PW). The phase winding section groups (PU, PV, PW) are laid, phase-cyclically and pole-for-pole, in the stator slots (8) of the stator (2).

Abstract: A double alternator for a vehicle and a vehicle electrical system employing the double alternator.

Abstract: In a method for winding the stator of a multiphase electric motor a plurality of mutually spaced stator teeth are assigned to each phase, wherein all the teeth of the stator are wound without a break in the winding wire, and wherein the winding wire is taken via a contact-making element of a contact-making device before or after the winding of all the stator teeth assigned to a phase.

Abstract: An automotive alternator including a rotor having a plurality of poles; a plurality of phases in operable communication with the plurality of poles; and a stator core in operable communication with the rotor, the stator having a number of slots defined by: S=(P×PH)+((M×PH)+N) where S=number of slots P=number of poles PH=number of phases M=a whole integer greater than or equal to 0 N=a whole integer selected from a group of integers ranging from, and including, 1 through the number of phases minus 1. A method for reducing magnetic noise in an automotive alternator includes selecting a number of poles, selecting a number of phases, selecting a number of stator core slots, the foregoing selections interacting in the automotive alternator to produce an order of frequency of a tangential force different than any multiple of the number of phases and different than an order of frequency of a radial force of the alternator.

Abstract: An electrical rotating machine with permanent magnets which is configured such that the ratio of the number of magnetic poles of permanent magnets 3 to the number of magnetic poles of coils 12 is at 10:9 or 8:9. The coils 12 are configured such that a middle coil U? and two adjacent coils U+, U+ on both sides thereof are in-phase connected to be in-phase coils for each phase, and there is satisfied the relationship that T2>T1 and T2>T3, where T2 is the turn number of the middle coil U?, and T1 and T3 are the turn numbers of the adjacent coils U+, U+.

Abstract: A rotary machine having a stator composed of a stator iron core having a plurality of slots formed in the direction of the rotation axis and stator windings inserted into the plurality of slots, wherein the stator windings are composed of a plurality of conductors respectively inserted into the plurality of slots in the direction of the rotation axis and the stator has a connection ring having slots into which the plurality of conductors are inserted in the direction of the rotation axis.

Abstract: The electrical machine has a stator, which comprises thirty-six slots and thirty-six teeth with an alternating sequence and a winding system (10) which is arranged at least partially in the slots and has three winding phases (34, 35, 36). The winding system (10) contains in total eighteen coil elements (11-28), which are laid in in each case two slots, with the result that a slot associated with another of the coil elements (11, 12, 16, 17, 18, 22, 23, 24, 28) is located between the two slots associated with one of the coil elements (13, 14, 15, 19, 20, 21, 25, 26, 27). In each case two of the coil elements (11-28) form one of nine interwound groups of coil elements (29), wherein, of the four adjacent slots belonging to a group of coil elements (29), the first and the third slot are associated with one coil element (13, 14, 15, 19, 20, 21, 25, 26, 27), and the second and the fourth slot are associated with the other coil element (11, 12, 16, 17, 18, 22, 23, 24, 28) in this group of coil elements (29).

Abstract: Disclosed is an electric machine (1) comprising a stator (2) that encompasses a winding system (10) with three winding branches, and a certain number of effective pole pairs. Each winding branch is provided with at least one coil group, each of which contains an even number of serially connected individual coils (11) that generate an individual magnetic field, respectively. Two respective individual coils (11) of a coil group are offset relative to each other in a circumferential direction of the stator (2) in such a way that the associated individual magnetic fields are provided with an offset electrical angle relative to one another at the sixth harmonic of the number of effective pole pairs, said offset electrical angle being equal to an odd multiple of 180°.

Abstract: A magneto generator can be made small in size and light in weight, and improved in power generation efficiency. The magneto generator includes an iron core having an iron core main body and a plurality of teeth (9) radially extending from the iron core main body, and an armature having a first three-phase winding (14) and a second three-phase winding (15) comprising winding portions (18u, 18v, 18w, 19a, 19b and 19c) of individual phases wound around the stator core. The individual first and second three-phase windings (14, 15) have the winding portions (18u, 18v, 18w, 19a, 19b and 19c) constructed by concentratedly winding conductors around the individual teeth (9), respectively, while skipping every predetermined number of teeth (9), and are wound in a state divided into an inner layer side and an outer layer side, respectively.

Abstract: A rotatable magnetic device has a housing, a shaft, a stator, a rotor and a cord. The housing is hollow and has an inner wall. The shaft is mounted coaxially and rotatably in the housing. The stator is mounted on the inner wall of the housing. The rotor is mounted on the shaft and has a polarity that causes the repelling magnetic force from the stator to rotate the rotor, which drives the shaft to rotate simultaneously.

Abstract: An inverter having M×N arms is connected to a first motor having N groups of M phase coils and a second motor having M groups of N phase coils. At least one of the first motor and the second motor has as many teeth as the number of phases of the motor multiplied by an integer, and the M×N coils of the motor are wound around the teeth by equal to or more than two coils for each of the teeth. Drive points of the M×N coils of the first motor are connected to output points of the corresponding arms of the inverter. Drive points of the N×M coils of the second motor are connected to output points of the arms of the inverter, so that each of the N phase windings in each of the M groups of the second motor is connected to each of the N drive points of the first motor, the N drive points having the same phase.

Abstract: It is an object of the invention to provide an improved technique for controlling the output characteristic of a motor. Representative power tool includes a tool bit and a motor. The motor drives the tool bit and includes an armature, a coordinator, a plurality of segments and a plurality of armature windings. The armature has a plurality of slots. The communicator rotates together with the armature. Plurality of segments is provided on the communicator. Respective armature windings are connected at the both ends of the segments. Each of the armature windings is defined by coils that are wound between respective pairs of the slots of the armature. Each of the armature windings is formed by at least two coils connected in series. At least one of the coils defining the armature winding has a different number of turns of a wire wound between the associated slots from the other coils in the same armature winding.

Abstract: An electric machine comprises a rotor assembly and a stator assembly adjacent the rotor assembly. The stator assembly includes windings disposed around a plurality of teeth, with each phase of the winding including at least one pair of coils wrapped in opposite directions around adjacent teeth to induce mutual inductance between the coils when electrical current flows through the phase of the winding. The coils of different phases are arranged to cancel magnetic coupling between the different phases. The winding arrangement provides a way to accomplish multiple, redundant, magnetically and electrically isolated windings with current limiting means in a single stator of an electric machine. The winding arrangements inherently provide an increase in mutual inductance and, therefore, an increase in impedance over that possible with prior art winding arrangements to limit the maximum short circuit current in the windings.

Abstract: A variable-speed rotating electric machine includes at least two armatures having respective armature coils for multiple phases, and a rotor having permanent magnets. The armatures are arranged concentrically with each other in such a manner that electrical angular positions of the individual armatures can be relatively varied in a circumferential direction. The armature coils of each phase are series-connected and the rotor is arranged concentrically with the armatures on the inside thereof.

Abstract: An electric motor produces an increased output torque for a given amount of input electrical current by using two magnetic field parts adjacent a winding part. Preferably, the winding part is disposed between the field parts. In a first embodiment, the two field parts are radially spaced from one another with the winding part therebetween. One field part is mounted on a hollow post through which an output shaft extends and on which a bearing is mounted for rotatably supporting thereon the winding part. In a second embodiment, the field parts are axially spaced from one another with the winding part therebetween. Axially spaced mounting wheels are connected to the output shaft for supporting therebetween a plurality of windings. The third embodiment includes a plurality of output shafts and a rotor suspended by interaction between pinions on the shafts and rotor gears.

Abstract: In an armature of a motor, each of windings is wound around at least two of a plurality of tooth portions of a core to form at least two wound parts of the winding. A crossover of each winding, which connects between corresponding two of the at least two wound parts, is placed on one axial side of a ring portion of the core. A crossover relief space is axially recessed in an end surface of the ring portion on the one axial side. At least a portion of each crossover is received in the crossover relief space. Guides project on the other axial side of the core and guide winding terminal portions of the windings.

Abstract: An exemplary power system may include an electric machine with multiple sets of stator windings, each set of windings being coupled through a separate switch matrix to a common voltage bus, and each of which may be spatially arranged in full pitch around the stator such that stator flux harmonics are substantially reduced. The reduced stator flux harmonics may be associated with phase current harmonic content. In an example application, such power systems may operate in a generating mode to transfer mechanical energy to electrical energy on a DC voltage bus. In some illustrative embodiments, the power system may provide both high-power and high-speed (e.g., 1 MW at 8000 rpm or above) motoring and/or generating capability suitable, for example, for on-board (e.g., marine, aviation, traction) power systems.

Abstract: An electric motor is provided with a multi-layered winding stator core configuration. A plurality of individual layers of wire strands are successively formed on each stator pole of a pole pair. Each winding layer is fabricated of the same relatively thin wire gauge. A first layer is applied directly on a pole and each successive layer is assembled on top of the last previous layer. Each layer of one pole of the pole pair is connected in series with a layer of the other pole of the pole pair to obtain a number of individual series coil connections equal in number to the number of layers. As inductance and resistance characteristics of the layers differ from each other as the layers increase in distance from each pole, layers from one pole of the pole pair are connected to respective layers different in order from that of the other pole pair.

Abstract: An electric rotating machine comprising a stator core having a plurality of slots that are equally spaced on the inner surface of the stator core in the peripheral direction, a rotor that rotates inside the stator core, and an armature winding that is applied to each of the slots, wherein the armature winding is made up with a plurality of serially-connected single-turn coils that are respectively applied to the slots and the serially-connected coils of respective phases are connected in parallel.

Abstract: It is made easy for a stator winding to be wound around a stator core and degradation in efficiency is prevented as much as possible. A stator 6 includes a plurality of phases, i.e., of circumferentially divided stator magnetic poles 6a, 6b, 6c. The stator magnetic poles 6a, 6b, 6c are each composed of an arcuate stator core 13 having a plurality of axially extending claw poles 16b and a circumferentially elliptically wound stator winding 14. The stator magnetic poles 6a, 6b, 6c are magnetically divided; therefore, magnetic flux leakage is reduced to improve efficiency. Air flowing between the stator magnetic poles 6a, 6b, 6c can improve a cooling effect.

Abstract: A motor stator includes a stator core stack having a core back and a plurality of teeth extending from the core back in a radial direction of the core back. The motor stator also includes winding wires wound around the teeth and having no bonding layer. Only winding wires of the first and third phases are wound to prevent loosening thereof.

Abstract: In at least one embodiment of the present invention a bell-armature coil for an electric motor is provided. The bell-armature coil comprises a hollow-cylindrical coil winding which forms a coil opening at one end and is wound from a winding wire. The bell-armature coil further comprises a coil former plate. The coil former plate includes a printed circuit board. Into the coil opening the coil former plate is inserted. The coil winding has conductor ends which are connected to the printed circuit board.

Abstract: A double alternator for a vehicle and a vehicle electrical system employing the double alternator.

Abstract: An armature for a brush commutated electric motor having a distributed coil winding arrangement for reducing brush arcing and electromagnetic interference (EMI). The winding pattern involves winding a first coil into a first pair of slots of the armature. A second coil having a first subcoil portion is then wound into the same slots as the first coil, while a second subcoil portion of the second coil is wound into a pair of slots that is offset by one slot position from the first pair of slots. The two subcoil portions have the same number of turns, and the total turns of the two subcoil portions equals the number of turns of the first coil. A third coil is then wound in the same slots as the second subcoil portion of the second coil. The third coil has the same number of turns as the first coil. This pattern is repeated around the armature.

Abstract: An electric machine including armature equipped with armature slots for accommodating armature coils, a commutator equipped with commutator segments, and a first and second hammer brush that each rest against the commutator in sliding fashion by means of a spring lever, in which at least one armature coil is comprised of two partial coils that are situated symmetrically to each other in relation to the rotation axis of the armature and the partial coils are connected to two adjacent commutator segments of the commutator.

Abstract: A phase winding of a stator winding comprises one or more pairs of interconnected partial coil, each partial coil formed of sequentially connected U-shaped segment pairs, each pair comprising a large segment and small segment. Two segment legs, of the large and small segment respectively of such a pair, constitute first and second conductor layers of a first stator slot and have their tip portions mutually connected. The remaining two segment legs respectively constitute fourth and third conductor layers of a second slot that is distant by one pole pitch, and have their respective tip portions mutually connected.

Abstract: A motor includes a stator having magnets, a rotor having teeth, a commutator secured to the rotor, and brushes. A coil is wound about each tooth. The commutator is connected to the coils. The brushes slidably contact the commutator. The number of the magnets and the number of the teeth are determined such that the resultant of torque vectors that act on the teeth is zero. For example, the number of the magnet is six, and the number of the teeth is eight. As a result, the rotor is prevented from vibrating.

Abstract: Structures of direct current motors or ac commutator (Universal) motors which use a concentrated winding on the rotor with coils wound around the teeth. The number of commutator segments is higher than the number of rotor teeth. Several coils are wound around the same tooth. The terminals of the coils are connected to different segments of the commutator. The parallel paths of the armature winding are perfectly balanced. An equal current distribution through the parallel circuits of the armature is maintained and there is no circulation current between these parallel circuits. The problems related to commutation are reduced because the value of the coil inductances is low. The copper volume of the end-windings, the Joule losses and the axial length of the motor armature are lower than a lap or a wave winding with interlocked coils. Two kinds of structures with a concentrated winding are presented: some with rotor teeth with identical dimensions and some with rotor teeth with different dimensions.

Abstract: Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “line current” (called the “quality” or “Q” of the tank) is (1) greater than one, (2) large enough to allow the percent efficiency of the electric motor to be equal to or greater than 95%, and (3) removes enough back emf or enough of the influence thereof so that criteria (1) and (2) can be realized throughout the entire operating range of the motor. Only one PIPRC is needed for a DC motor. Recontrolling and/or redesigning is done for two reasons.

Abstract: In a vehicular alternator, a stator is arranged to oppose a rotor in a housing. The stator includes a stator core, which forms a plurality of slots extending in an axial direction of the stator core, and a stator winding wound around the stator core. The stator winding includes electric conductors held in the slots. Each of the electric conductors has a circumferential width that is smaller than a circumferential distance between a first wall and a second wall defining the slot. The first wall and the second wall oppose each other in a circumferential direction. The electric conductors are alternately in contact with one of the first wall and the second wall.

Abstract: A method for manufacturing an armature including securing a core to the shaft having a plurality of slots extending in the axial direction formed on the outer circumferential surface thereof, forming a coil composed of a plurality of coil portions by simultaneously winding wires a plurality of turns around a pair of slots separated by a predetermined number of slots and offsetting each of the coil portions one slot at a time in the circumferential direction of the core, securing a commutator to the shaft having a plurality of segments, adjacent coil portions having a slot along one side thereof, and electrically connecting segments which should have the same electric potential by means of equalizing connectors so that each pairs of the segments that should have the same electric potential has a substantially equal electrical potential.

Abstract: The present invention provides an axial rotary energy device which is arranged in a multi-phase electric current configuration. The device includes a rotor having a plurality of permanent magnet poles secured thereto and further includes a stator formed by stacking a plurality of printed circuit board working conductor layers together with a plurality of printed circuit board connecting layers. The stator having at least one working conductor layer for each phase of the electric current and at least one connecting conductor layer associated with one working conducting layer. The working conductor layer and the connecting conductor layer each having radial conductors extending from an inner diameter through-hole to an outer diameter through-hole. A plurality of via conductors are provided for electrically connecting selected ones of the radial connectors of the connecting conductor layer to selected ones of the radial connectors of the working conductor layers through the through-holes.

Abstract: An electric machine having multi-set rectangular copper hairpin windings comprises a stator having a plurality of partially closed stator slots. A first winding set and a second winding set are positioned in the stator slots. The first winding set and the second winding set are connected by adjacent leg ends. According to a first embodiment, conductor layers in alternate slots alternate between different phases. The conductor layers in the remaining slots are all of the same phase. Hairpins having unequal length legs are used to implement the first embodiment. According to a second embodiment, conductor layers in alternate slots include one phase for the first winding set and another phase for the second winding set. The conductor layers in the remaining slots are all of the same phase. Hairpins having equal length legs are used to implement the second embodiment.

Abstract: There are apparatus and methods for generating a plurality of voltage levels. There is a rotor that includes a first and a second portion of rotor windings. The first portion of rotor windings is constructed and arranged to establish a first magnetic field of a first number of poles. The second portion of rotor windings is constructed and arranged to establish a second magnetic field of a second number of poles. A stator is disposed adjacent the rotor. The stator includes a first and a second portion of stator windings. The first portion of stator windings is related to the first number of poles and has a first output port configured for furnishing an electrical output at a first voltage level. The second portion of stator windings is related to the second number of poles and has a second output port configured for furnishing an electrical output at a second voltage level.

Abstract: A rotary electric machine having an armature winding that includes three first phase-windings that form a ?-connection winding having output ends and three second phase-windings that are respectively connected in series to the output ends to form a star-connection three-phase winding having output ends connected to a rectifier unit.

Abstract: A novel design concept for a torquer motor is useful for stabilizing apparatuses in a vibrating structure. According to one aspect, a novel design for a coil pair is provided. A first coil in the pair is box shaped with a hollow interior portion and windings provided on a surface opposite the hollow interior. A second coil in the coil pair is flat and torus shaped with windings provided on the surface. According to one example, the second coil is bent so as to conform to the shape of the first coil, and disposed over the first coil so that the respective windings are oriented orthogonally to each other in a common plane direction so as to define an active area. The active area may be further disposed in the magnetic field of a magnet pair in a torquer motor application. The design provides advantages such as inherent rigidity and more efficient heat transfer, while providing high torque or a desired range of movement.

Abstract: A stator for an electric machine includes a generally cylindrically-shaped stator core having a plurality of circumferentially-spaced and axially-extending core teeth that define a plurality of circumferentially-spaced and axially-extending core slots extending between first and second ends of the stator core. Within the core is a stator winding having a plurality of phases, each of the phases including a pair of conductors connected in parallel and having a plurality of slot segments housed in the core slots. The slot segments are alternately connected at the first and second ends of the stator core by a plurality of end loop segments. The conductors within each pair of each phase are connected in parallel and are in phase with one another such that the stator core has two slots per phase per pole.

Abstract: Several embodiments of permanent magnet type three-phase AC rotary electric machines wherein the phase current flow is formed by parallel circuits formed by a plurality of serial circuits each comprising one or a plurality of stator coils so that electromagnetic voltage or counter electromagnetic voltage generated across opposite ends of the plural serial circuits may be always almost the same. Thus, a circulating current does not flow in the parallel circuits, whereby the efficiency of the rotary electric machine can be improved. Also, since the line current circuit of each of the phases is constituted of a parallel circuit, the current flowing in each of the stator coils is small so that the diameter of the stator coil wire can be small. Thus, the winding of the coils can be improved. Also, the processing of the coil terminals is facilitated and the processed portions of the terminals can be made small, resulting in a compact rotary electric machine.

Abstract: In a vehicular alternator, a stator is arranged to oppose a rotor in a housing. The stator includes a stator core, which forms a plurality of slots extending in an axial direction of the stator core, and a stator winding wound around the stator core. The stator winding includes electric conductors held in the slots. Each of the electric conductors has a circumferential width that is smaller than a circumferential distance between a first wall and a second wall defining the slot. The first wall and the second wall oppose each other in a circumferential direction. The electric conductors are alternately in contact with one of the first wall and the second wall.

Abstract: Slots are formed at a nonuniform pitch at a ratio of two slots per phase per pole. An X-phase winding phase portion constituting a stator winding is constructed by connecting in series an a-phase winding phase sub-portion and a d-phase winding phase sub-portion having a phase difference corresponding to an electrical angle of 34 degrees, a Y-phase winding phase portion is constructed by connecting in series a b-phase winding phase sub-portion and an e-phase winding phase sub-portion having a phase difference corresponding to an electrical angle of 34 degrees, and a Z-phase winding phase portion is constructed by connecting in series a c-phase winding phase sub-portion and an f-phase winding phase sub-portion having a phase difference corresponding to an electrical angle of 34 degrees.

Abstract: The present invention relates an electric rotating machine comprising a plurality of phase coils each composed of a plurality of partial coils each made by connecting segments each composed of an inside-slot conductor portion to be accommodated in each of slots of each of phase slot groups made in a stator core and an outside-slot conductor portion protruding from the slot. Of the plurality of partial coils constituting each of the phase coils, in each of the partial coils to be connected to an input/output terminal, its inside-slot conductor portion is accommodated in the slot other than end portions of the phase slot group in a circumferential direction of the stator core. This reduces the electric potential difference between the outside-slot conductor portion continuing thereinto and the outside-slot conductor portion of an adjacent phase coil, thereby improving the insulating performance.

Abstract: Disclosed is a pole-change type motor that provides a variable-speed (two-pole or four-pole type) operation system capable of reducing the load of the motor of the normal operation system and improving the cooling efficiency. In case of a quick operation, the motor switches over to the two-pole type according to the control of a relay section. At this time, the load of the motor is reduced by offsetting an abnormal magnetic field distribution formed due to the same polarity of adjacent main windings using compensation windings of an opposite polarity. If the quick operation is needed, the motor switches over to the two-pole type, and operates at a high speed to achieve the quick cooling. Then, if a standard operation is possible with the lapse of the predetermined time, the motor switches over to the four-pole type, and operates at a low speed to achieve an effective cooling.

Abstract: A stator winding is provided with three distributed winding phase portions each constructed by installing a conductor wire in every third slot. Slot-housed portions of the conductor wires are formed with a rectangular cross section and coil end portions are formed with a circular cross section.

Abstract: A magnetic circuit component having a plurality of claws arranged in a plurality of rows, with the base of each claw connected to a common yoke. A plurality of non-interlaced coils constituting a multi-phase winding are included, with the coils being wound around the bases of corresponding claws, and being distributed uniformly in the direction of motion.

Abstract: Disclosed is a Segmented Coil Array (“SCA”) for use in rotary electromotive devices, such as motors and generators, which employ multiple coils operating within an axial gap magnetic structure. Individual conductor coils have offset circumferentially extending portions so as to allow interlocking of adjacent coils radially extending portions to form a circular array in which all of the coils' working conductors, which are those in the axial magnetic field, can be oriented in the same plane. This construction allows minimum magnet gap spacing, thus, maximizing the available magnetic flux. The resulting SCA may easily be commuted as a three-phase motor, actuator, or generator. The invention also provides a structure whereby multiple coil arrays and associated magnetic rotors may be alternately stacked in layers so as to further increase the total coil working area within a motor or generator of a given diameter.