Abstract: A fan includes a fan frame, a rotor, a stator module and a protection structure. The fan frame has a base seat and the stator module is disposed on the base seat. The stator module includes a silicon steel sheet assembly having multiple splits and multiple outer faces. The rotor is disposed in the fan frame corresponding to the outer faces of the silicon steel sheet assembly. The protection structure includes multiple posts corresponding to the splits of the silicon steel sheet assembly. The posts are welded with the splits by means of laser welding.

Abstract: A fan includes a fan frame, a rotor, a stator module and a protection structure. The fan frame has a base seat and the stator module is disposed on the base seat. The stator module includes a silicon steel sheet assembly having multiple splits and multiple outer faces. The rotor is disposed in the fan frame corresponding to the outer faces of the silicon steel sheet assembly. The protection structure includes multiple posts corresponding to the splits of the silicon steel sheet assembly. The posts are welded with the splits by means of laser welding.

Abstract: A stator of a rotary electric machine includes an annular stator core with a plurality of slots arranged in a circumferential direction, a stator winding formed by three phases of phase windings wound around the slots, and neutral wires for commonly connecting ends of the phase windings together in star-connection. Each of the phase windings has two partial windings that are electrically connected in parallel, ends of at least two sets of the partial windings formed by combining two partial windings among the total of six partial windings in different phases and the ends of the neutral wires are connected electrically, and the partial windings connected to both ends of each neutral wire include all the phases.

Abstract: A spacer for mechanically stabilizing and electrically insulating an end winding in an electric motor includes an elastic nose having a free end. A planar, electrically insulating sheet is integrally formed at an end of the nose located opposite the free end. Such spacers are used in an electric motor having an iron core, whose teeth are surrounded by coils whose end windings laterally project from the iron core. The spacers are press-fitted inside openings formed by the end windings and the teeth, so that the end windings are covered by the sheet of the press-fitted spacer in the direction of an air gap of the electric motor in each case.

Abstract: A bar wound stator includes a stator core defining a plurality of slots. Bar-type conductors are disposed within each slot. Each slot includes a slot liner and an insulator cap. Each slot liner includes an end portion disposed against an inner wall surface, and side portions disposed against a first wall surface and a second wall surface respectively. Each insulator cap includes a base portion disposed against an outer wall surface, and side portions disposed against the first wall surface and the second wall surface respectively. The side portions of the insulator cap in each slot overlap the side portions of the slot liner in each slot along the first wall surface and the second wall surface respectively. Each slot includes a recessed feature in each of the first wall surface and the second wall surface to accommodate the overlapping side portions of the insulator cap and the slot liner.

Abstract: A stator for an electric rotary machine includes: a stator core having a plurality of slots; and segmented coils of a plurality of phases, wherein: the segmented coils of a plurality of phases have pluralities of coil bars which are inserted individually in the plurality of slots in the stator core and which extend substantially in a straight line and pluralities of connection coils which connect together the coil bars of the same phase to thereby make up extending portions; and the coil bars are fixed in place individually in the slots in the stator core in such a state that the coil bars each are covered by an insulation material.

Abstract: A coil retainer for a rotor includes a flat body and a longitudinal spine. The flat body has a first thickness and the longitudinal spine has a second thickness greater than the first thickness. The coil retainer may also include a central rib, which has a third thickness. The central rib runs laterally relative to the flat body and the third thickness of the central rib is greater than the first thickness.

Abstract: Magnets may be embedded in first recessed portions of a rotor core, and at least one stopper is each attached to an axial end of the rotor core. The rotor core may include second recessed portions each including a locking portion arranged to project inward therein. The stopper may include a base portion arranged to close the first recessed portions, and elastically deformable hook portions each arranged to be inserted into a separate one of the second recessed portions to be engaged with the locking portion. The rotor core may include first plates and second plates placed upon one another. Each first plate may include first locking elements each defining an opening, while each second plate may include second locking elements each defining a larger opening. The locking portions may be defined by arranging the second plates axially inward and placing the first plates upon the second plates.

Abstract: An electric machine includes a rotor, a stator housing and a winding assembly surrounding the rotor. The winding assembly is arranged in the stator housing and has an axially extending effective region in which the winding assembly is set up to interact electrodynamically with the rotor. The stator housing has a peripheral opening slot on the side facing the rotor. The opening slot corresponds in its axial extent to the axial extent of the effective region of the winding assembly and in which an electrically non-conductive can of the electric machine is inserted. The can is sealed off with the stator housing in such a manner that the winding assembly is hermetically separated from the rotor. The can extends axially only on the effective region of the winding assembly.

Abstract: The present invention relates to armature windings for DC electrical machines, and in particular to those that use electronic commutation and have relatively few slots per pole-pair. The armature windings are particularly well suited for use with rotating DC electrical machines that have a large diameter and a large number of poles such as those that might be directly coupled to the turbine blade assembly of a wind turbine. The armature winding is arranged in relation to the magnetic field generated by a field winding or by permanent magnets such that a number of commutation events during the time taken for the relative movement between the armature and the field system of one pole-pair is much larger than the number of coils per pole-pair.

Abstract: The present invention provides an electric rotating machine capable of providing a high quality and efficient machine operation with reduced oscillation and noise by lowering torque ripple. The electric rotating machine includes a stator having a plurality of teeth facing a rotor, and a plurality of slots providing spaces for winding coils around the teeth. The rotor has a pair of permanent magnets embedded therein and located in a “V” shape configuration so as to let magnetic force act on the teeth such that the rotor within said stator is driven to revolve by reluctance torque and magnet torque. An outer diameter ratio ? of an outer diameter Dr of the rotor to an outer diameter Ds of the stator falls in a range from 0.61 to 0.645.

Abstract: Embodiments of the invention provide an electric machine module. The module can include a housing, which can define a machine cavity. In some embodiments, an electric machine can be positioned within the machine cavity. In some embodiments, the electric machine can include a stator assembly including potted stator end turns. An end turn member can be positioned within the machine cavity and can include a radially inward flange and a radially outward flange axially extending from a central region. The end turn member is configured and arranged so that the flanges are substantially adjacent the stator end turns. The end turn member can include at least one second member aperture disposed through a portion of the central region.

Abstract: A wind turbine having a wind turbine tower with a nacelle; a wind turbine rotor hub with at least one rotatably mounted wind turbine blade; a shaft coupled to the wind turbine rotor hub and a generator. The generator has a rotor having at least one superconducting rotor coil arranged rotatably relative to a stator having at least one stator coil. The rotor is arranged in a rotor housing and the stator is arranged in a stator housing, the housings being separated by a rotor-stator gap. The stator housing has a stator inner shell and a stator outer shell connected together by at least one stator housing end plate. The stator inner shell has a first inner shell element attached to a stator iron that is connected to a second inner shell element. A pressure plate is attached to the second inner shell element and the stator outer shell.

Abstract: A system for completing an electrical circuit includes first and second base contacts electrically isolated from each other, each having a magnetic portion secured thereto, each magnetic portion having an opposite polarity, and each of said base contacts electrically connected to an electrical lead for transmitting an electrical signal through said base contacts. The system also includes first and second mating contacts electrically isolated from each other, each having a magnetic portion of opposite polarity secured thereto.

Abstract: A wedge for use in a generator rotor has a wedge body with a central radially top surface of the wedge body, formed with a plurality of blades. At least some of the plurality of blades extend at an angle such that a plane defined through the blades will be non-perpendicular to a rotational axis of the rotor that will receive the wedge.

Abstract: The invention relates to a rotor for a dynamo-electric machine having: a rotor body which rotates about a rotation axis which runs in the direction of gravity, winding elements which are arranged in slots which run axially in the rotor body, two winding heads which are arranged above and below the rotor body in the axial direction, wherein the winding elements emerge from the slots in the axial direction in the region of the winding heads and are connected to further winding elements, a winding head carrier for each of the winding heads, which winding head carrier is arranged radially within the winding head and coaxially to the rotation axis, and which winding head carrier is fixed at least indirectly on the rotor body, or on a component which revolves with said rotor body, in a rotationally fixed manner and such that it can move in the direction of the rotation axis.

Abstract: In a rotating electrical machine, a conductive foil or conductive rubber is applied to the surface of insulation layer of a conductor series connection area or to the surface of insulation layer of a turn conductor of coils of rotating electrical machine winding, waveforms of grounding voltages of the individual turn conductor portions are measured through the medium of an electrostatic capacitance of the insulation layer of coil conductor series connection area or through the medium of the insulation layer of coil turn conductor, and a partial discharge is measured while measuring a voltage developing in the coil or across a winding turn in the coil from a difference between the waveforms of grounding voltages.

Abstract: A coil fixing member of a rotating electrical machine, wherein the rotating electrical machine includes a ring-shaped stator core, a slot formed at inner peripheral section of the stator core, a coil arranged in the slot, and wall sections defining opening on an inner periphery of the slot in a radial direction of the stator core, and wherein the coil fixing member is inserted into the slot, the coil fixing member comprising: a pressing section that presses the coil outward in the radial direction of the stator core; and engaging sections that are adjacent to both end sections of the pressing section in a peripheral direction of the stator core, that extend from the both end sections to an inward side in the radial direction of the stator core, and that include leading end sections respectively engaged with the wall sections.

Abstract: A stator for use in an electric motor is disclosed. The stator comprises an annular core, a plurality of wedges, and a plurality of wedge-retaining structures. The core includes a plurality of arcuately spaced apart teeth. Each of the teeth includes a generally radial leg and a head projecting from the leg to present a pair of arcuately spaced apart head ends. A slot opening is defined between the opposed head ends of each adjacent pair of teeth. Each of the wedges is received within a corresponding slot opening. Each wedge-retaining structure is at least in part fixed relative to the core and cooperates with a respective one of the wedges to compressibly retain the respective wedge between the head ends.

Abstract: A rotor for a rotating electrical machine may include a number of pole teeth which carry a field winding, slots formed between the pole teeth, slot wedges provided in the slots, and separators arranged in the slots, the separators extending, starting from the slot wedges, between the windings in a direction toward a slot base.

Abstract: Included are a pair of insulators arranged on axial end surfaces of a split core, and an insulating film attached to lateral side surfaces of the tooth part, for insulating the split core from a coil wound around the tooth part. Each insulator includes projections projecting further than a tooth front end part in the circumferential direction, slits which are formed in the respective projections to a corresponding axial end surface side of the tooth front end part and into which the insulating film is inserted, and ribs formed, on an end surface side in the circumferential direction, in the respective projections. The insulating film inserted into the slits is folded back to a back yoke part side with the ribs interposed therein, and fixed by being interposed between the ribs at tip portions of projections of adjacent insulators. Accordingly, the insulating film can be assuredly fixed and prevented from escaping from a slot.

Abstract: A coil is wound via an electrically insulating member within a slot of a stator core of an electromagnetic motor which is formed of a stator and a rotor. Groove portions are formed to oppose one another in respective opposing portions of a slot opening portion side of the electrically insulating member. An electrically insulating sheet is disposed by being inserted into the pair of groove portions.

Abstract: Systems and methods for constructing a stator for use in downhole equipment such as ESP systems, where granulated filler material is used instead of encapsulants to provide mechanical support to the stator windings, provide electrical insulation in the stator slots, and conduct heat away from the windings. In one embodiment, a stator for an electric motor includes a plurality of laminations stacked together to form a stator core. Stator windings are positioned in slots within the stator core. The stator core and windings are installed in a stator housing, and a solid, granular filler material is used to fill an unoccupied volume within the slots. Retainer fittings are secured to the stator to retain the granulated filler material in the slots.

Abstract: Systems and methods for the construction of electric motors, where expandable material is inserted into the slots in which magnet wires are positioned and expanded in the slots to mechanically restrain the wires. One embodiment comprises a downhole electric motor such as might be used in an electric submersible pump (ESP) system. The motor has a stator with multiple slots in which magnet wires are positioned. A slot liner is positioned in each slot and an expansion pad is positioned in each slot between the slot liner and the slot wall nearest the bore of the stator. The wires are positioned inside the slot liner. When the motor is almost completely assembled, it is filled with oil. Some of the oil is absorbed by the expansion pads, which then expand to fill the unoccupied volume in the slots, thereby restraining the movement of the wires within the slots.

Abstract: According to an embodiment, radially extending inner spacers are provided in a stator core at a distance from each other in the circumferential direction at intervals between a prescribed number of stacked magnetic steel plates, and ventilation ducts for cooling gas flow are formed in the radial direction. The perimeter of each ventilation duct is defined by the inner spacers and a magnetic steel plate separated by the inner spacers. The cooling gas, which flows in the rotation direction, is split laterally to both sides of a rotor coil and directed toward the outer circumference. Portions of the shoulder parts of a wedge are cut off such that the width of the shoulder parts of the wedge at positions corresponding to the ventilation ducts matches the slot width.

Abstract: The present invention relates to a stator for a motor including: a stator core having an annular back yoke and a plurality of teeth; an upper insulator having an annular body portion formed correspondingly to the back yoke of the stator core and a plurality of teeth insulation portions formed correspondingly to the teeth of the stator core so as to cover the upper sides of the teeth of the stator core; a lower insulator having an annular body portion formed correspondingly to the back yoke of the stator core and a plurality of teeth insulation portions formed correspondingly to the teeth of the stator core so as to cover the upper sides of the teeth of the stator core; a plurality of insulation films each adapted to be inserted into the slot to cover the side of the stator core exposed to the inside of the slot between the upper insulator and the lower insulator; and coils adapted to be wound on the teeth of the stator core enclosed by the upper insulator, the lower insulator and the insulation films.

Abstract: An electric machine comprises an outer casing (2), a rotor and a stator (3) having at least one polar expansion (5) and at least one winding (8) having an annular shape and placed around the polar expansion (5). The casing (2) has a plurality of protrusions (13) each of which holds, by supporting, a corresponding portion (12) of a stator winding (8) to enable heat exchange between the winding (8) and the protrusion (13). Each portion (12) of the winding (8) is electrically insulated from the respective protrusion (13).

Abstract: The invention relates to a DC motor 1 comprising a cylindrical coil carrier 7; 17 comprising wire guide element 9; 10, 12 for guiding a first winding wire 80; 180 and a second winding wire 81; 181 of an air-gap winding on both side end sections, wherein the first winding wire 80; 180 and the second winding wire 81; 181 each comprise rectangular winding segments 20; 120, wherein the rectangular winding segments 20; 120 of the second winding wire 81; 181 are disposed overlapping on the cylindrical coil carrier 7; 17 and the wire guide elements 9; 10, 12 are designed for guiding the first winding wire 80; 180 and the second winding wire 81; 181 past each other.

Abstract: A coil retainer for a rotor includes a flat body and a longitudinal spine. The flat body has a first thickness and the longitudinal spine has a second thickness greater than the first thickness. The coil retainer may also include a central rib, which has a third thickness. The central rib runs laterally relative to the flat body and the third thickness of the central rib is greater than the first thickness.

Abstract: A wedge for a rotor of an electric machine includes a circumferentially outer surface defining a radial extent of the wedge extending from a first axial end of the wedge to a second axial end of the wedge. A plurality of circumferentially-extending grooves extend radially inwardly from the circumferentially outer surface to a groove depth. The plurality of grooves are axially spaced along a wedge length between the first axial end and the second axial end. The axial spacing between the grooves is greater than an axial width of each groove. An intermediate surface between adjacent grooves has a same radial position as a first end surface between the first axial end and a first groove closest to the first axial end. Two planar side surfaces circumferentially bound the circumferentially outer surface and extend radially inwardly from the cicumferential outer surface.

Abstract: A wedge for use in an electric machine has a central leg extending in a direction that will be radially inward when the wedge is mounted on a lamination stack, The wedge has arms extending in both circumferential directions from the central leg, with a circumferentially outermost part of the arms having a curved surface that will be radially outward, and a flat inner surface that will be radially inward when the wedge in mounted in the lamination stack. A generator/motor rotor and a generator/motor are also disclosed.

Abstract: A coil fixing device capable of accurately positioning and fixing a coil to a slot of a stator core of an electric motor, and an electric motor having the fixing device, while not using adhesive and having a structure not affecting the characteristic of the electric motor. A positioning member of the fixing device has a coupling member positioned at an axial end of the stator core; a plurality of protruding portions connected to the coupling member at the same angular intervals as the coils, each protruding portion radially inwardly extending from the coupling member; and a latching portion connected to a front end of each protruding portion, the latching portion extending from the front end of each protruding portion in a direction across an extending direction of the protruding portion.

Abstract: In a rotary electric machine provided with a rotor and a stator, a wedge is inserted between in-slot portions stacked in each of slots of the stator and a wall of each of the slots. The wedge has two edges and a length ranging from one of the edges to the other. The length of the wedge is smaller than an axial length of the stator core. The wall is located oppositely to an opening of each slot. By inserting the wedge, both end portions of the conductors are tilted so as to be oriented oppositely to the rotor in the radial direction. The tilted end portions starts from each of the two edges of the wedge in the axial direction.

Abstract: Disclosed is a canned motor for restraining a cogging torque from being generated by inserting magnetic metal pins into slot openings of a stator, thereby reducing noise and vibrations during an operation of the canned motor. The canned motor includes: a can inserted into a housing to seal a coil mounted within the housing; and a stator installed on an outer peripheral surface of the can and inserted along an inner peripheral surface of the housing. A plurality of fixing guides protrude from an outer peripheral surface of the can and metal pins are inserted into the fixing guides to be integral with the fixing guide, such that the metal pins are inserted into and attached to slot openings of the stator when inserted into the stator.

Abstract: A motor for use within a refrigerant atmosphere includes a plurality of laminations stacked along an axis, the laminations cooperating to define a plurality of teeth and a slot disposed between each pair of adjacent teeth, a plurality of coils each positioned around a tooth such that each coil is partially disposed in two adjacent slots, and a first phase winding formed from at least two coils, the first phase winding including a single continuous conductor. An insulating member is disposed within each of the slots and arranged to electrically insulate the coil within the respective slot from the laminations and a wedge is positioned within at least one of the slots. The wedge is operable to compress the coil within the slot. A rotor is positioned adjacent the stator and is operable to rotate about the axis.

Abstract: The invention relates to an axial flux electric machine having permanent magnets and comprising a rotor surrounding a stator. It is characterized in that the stator comprises: a “support” first portion; a set of active modules constituting the secondary portion of the magnetic circuit; and fastener means for fastening the modules to the support portion.

Abstract: The invention relates to a synchronous machine with hybridenergisation, in particular a generator for supplying the electrical system of a motor vehicle, comprising a laminated stator (16) with a multiphase stator winding (18) and a laminated rotor (20) with an energizer winding (29), which together with permanent magnets (24,25) around the rotor periphery, provides the energisation for the machine. According to the invention, favorable electrical and magnetic properties and an improvement in manufacturing conditions of the machine can be achieved, wherein the grooves (40) for the energiser windings (29) are disproportionately enlarged in relation to the groove base (44) and are preferably bell-shaped.

Abstract: A motor-generator that is a rotary electric machine includes a cylindrical stator core having a plurality of teeth that are arranged spaced apart from each other in a circumferential direction and extend in a radial direction; a cassette coil arranged on an outer periphery of each of the teeth; an insulator that has a pawl portion and is interposed between the stator core and the cassette coil; and a wedge that is provided extending between the cassette coils that are adjacent to each other, which fixes the cassette coils with respect to the stator core. The wedge is retained by the pawl portions of the insulators that are adjacent to each other.

Abstract: A stator includes a core-back portion, teeth portions, insulators, and coils. The teeth portions extend radially from a circumferential surface of the core-back portion. The insulators are respectively mounted to the teeth portions. The coils are respectively mounted to the insulators. A tip end of the tooth portion has a circumferential width equal to or smaller than that of a base end of the tooth portion. The tip end has an axial width equal to or smaller than that of the base end. The insulator includes a tube portion accommodating the tooth portion. The tube portion includes a first opening existing at the tip end and a second opening existing at the base end. The first opening has an axial width smaller than an axial width of the second opening in a state that each of the insulators is removed from each of the teeth portions.

Abstract: The invention concerns an asynchronous machine having a slip-ring rotor for use with a variable rotational speed, with a rotor, a rotor body, having grooves mounted radially into the rotor body, winding elements of the rotor, from which respectively at least one element runs axially through each of the grooves, locking elements, which co-operate in a form fit manner with the rotor body and close the grooves radially and outwardly, a high voltage insulation with outer corona protection around each of the winding elements. The invention is characterised in that between the outer corona protection of the winding element and at least one neighbouring wall of the groove in peripheral direction electrically conducting connecting means are arranged for releasable connection of the winding element with the rotor body.

Abstract: A stator (100) of an electric motor includes a coil (12), a stator core (10) which supports the coil, and covers (22a, 22b) which are attached to the stator core so as to surround coil ends (13a, 13b) of the coil, wherein the covers have outside diameters which are at least partially smaller than the outside diameters of the stator cores, the covers have coefficients of linear expansion which are larger than the coefficient of linear expansion of the stator core, and the covers expand due to heat whereby the covers closely contact the housing which is arranged around the stator.

Abstract: A stator segment for a segmented stator of an electric machine includes insulative material configured for overlapping with insulative material of an adjacent stator segment to provide continuous insulation along a joint between the adjacent stator segments. Additionally, or alternatively, the stator segment can include one or more alignment tabs configured to engage a surface of an adjacent stator segment to inhibit relative axial movement between adjacent stator segments.

Abstract: A ripple spring is provided having one or more conductive layers, and one or more non-conductive layers. The conductive layers and the non-conductive layers are laminated together to form a symmetrical stack of layers. A method is also provided for monitoring the ripple spring. The method includes the steps of providing a ripple spring that holds a winding in place, where the ripple spring is positioned at least partially within a stator slot defined within an electromechanical device. Providing a conductive layer disposed within the ripple spring, and generating signals from the conductive layer, the signals corresponding to at least one aspect of the ripple spring. An analyzing step analyzes the signals to determine the at least one aspect of the ripple spring, wherein the at least one aspect facilitates an identification of faults in the ripple spring.

Abstract: The invention relates to a synchronous machine with hybrid energization, in particular a generator for supplying the electrical system of a motor vehicle, comprising a laminated stator (16) with a multiphase stator winding (18) and a laminated rotor (20) with an energizer winding (29), which together with permanent magnets (24,25) around the rotor periphery, provides the energization for the machine. According to the invention, favorable electrical and magnetic properties and an improvement in manufacturing conditions of the machine can be achieved, wherein the grooves (40) for the energizer windings (29) are disproportionately enlarged in relation to the groove base (44) and are preferably bell-shaped.

Abstract: An electric motor includes a stator, a case surrounding the stator, and a rotor rotatably disposed with respect to the stator. The rotor includes a rotor core having a plurality of poles and slots, a shaft coupled to a central portion of the rotor core, a rotor coil wound on the rotor core, and coil supporting members provided at the rotor core. The coil supporting members are configured to support the rotor coil such that the rotor coil is prevented from being separated from the rotor core in a radial direction when the rotor rotates. Under such a configuration, a short-circuit of the rotor coil due to a centrifugal force when the rotor rotates, can be prevented.

Abstract: A wedge for use in an electric machine has a central leg extending in a direction that will be radially inward when the wedge is mounted on a lamination stack, The wedge has arms extending in both circumferential directions from the central leg, with a circumferentially outermost part of the arms having a curved surface that will be radially outward, and a flat inner surface that will be radially inward when the wedge in mounted in the lamination stack. A generator/motor rotor and a generator/motor are also disclosed.

Abstract: A stator includes a stator core, slots, coils, an interphase insulation sheet, and wedges. The interphase insulation sheet is provided between coil ends of adjacent coils having different phases among the coils. The interphase insulation sheet includes a first sheet body portion, a second sheet body portion, and a first bridge portion. The first and second sheet body portions respectively have first and second retaining pieces. The first retaining piece projects from the first sheet body portion toward the second sheet body portion in the developed state of the interphase insulation sheet. The second retaining piece projects from the second sheet body portion toward the first sheet body portion in the developed state of the interphase insulation sheet. The first and second retaining pieces are retained by projecting portions of the wedges.

Abstract: An apparatus and method for providing electrical insulation between adjacent end turns at different phases within a stator assembly. In one embodiment, the invention is directed to a stator assembly comprising: a stator core having a plurality of slots; at least two coils of different phases wound on the stator core through the slots and having an end turn that extends from the stator core; and one or more separator members positioned between adjacent end turns of the coils.

Abstract: A magnetic wedge comprises a first element of magnetic material extending longitudinally along a first direction and second element of non-magnetic material coupled to the first element and having at least one skew portion relative to the longitudinal extension direction of the wedge.

Abstract: A stator structure, including strip shaped stator cores and end insulators. The end insulators are injection molded with the strip shaped stator cores, as a whole. A wire duct is arranged on top of a yoke of each strip shaped stator core and at the bottom of each end insulator. Two ends inside the wire duct are projected with bosses. Coil windings wind around the bosses and pass through the wire duct. The stator structure is simple and easy to mass produce. It can make full use of the slot filling ratio of the strip shaped stator. The invention solves the puncture problem.