Abstract: In one arrangement, a motor assembly includes a housing defining a housing chamber, a stator disposed within the housing chamber, and a rotor assembly disposed within the housing chamber. The rotor assembly includes a spindle housing defining a spindle housing chamber extending along a longitudinal axis of the spindle housing and a set of magnets disposed about an outer periphery of the spindle housing and in proximity to the stator. The rotor assembly includes a ball nut cartridge disposed within the spindle housing chamber of the spindle housing and a securing mechanism configured to secure the ball nut cartridge to the spindle housing.

Abstract: A resin protective cover is prepared so as to have a cup shape that is constituted by a floor portion and a tubular peripheral wall portion, and that can be mounted to a rear bracket so as to cover a rectifying apparatus and a voltage regulator that are disposed axially outside the rear bracket. The protective cover includes an engaging hook that includes: a shank portion that is disposed so as to extend from an opening end of the peripheral wall portion; and a hook portion that is disposed so as to project radially outward from a tip end of the shank portion, and the protective cover is held on the rear bracket elastically in an engaged state by the engaging hook being inserted into an engaging aperture that is formed on a casing.

Abstract: A motor includes a rotary shaft and a motor housing internally housing the rotary shaft. The motor housing is provided with a mounting hole in a position corresponding to an end of the rotary shaft. A detection rotor is fixed to the end of the rotary shaft. A detection stator includes a detection part made of resin into a plate-like shape having a surface on which a planar coil is placed, an outer peripheral wall axially extending from an outer circumferential edge of the detection part, and a flange radially extending from the outer peripheral wall. The detection stator is placed so that a surface of the detection part faces the detection rotor and the surface of the detection part faces to the inside of the motor housing in the mounting hole, and fixed to outside of the motor housing with a screw to the flange.

Abstract: A disc-type electric machine with amorphous iron alloy axial magnetic circuit, its stator iron core with an axial center through hole is processed into a cylinder made from amorphous iron alloy lamination, and its outer cylindrical surface is uniformly processed with a plurality of equi-spaced axial armature slots towards the center axial line. In the stator iron core embedded winding assemblies with the same number as the armature slots, each winding assembly comprises a winding wire frame matched with the armature slot, each stator winding arranged respectively in a slot of the winding wire frame and a magnetic conducting body arranged in a through hole of the winding wire frame. The said disc-type electric machine has short axial size, less moving components, small eddy current loss, excellent high-frequency characteristic, low temperature rising, high efficiency, high power density, high material utilization rate and high efficient energy-saving.

Abstract: An in-wheel driving device disposed in a car wheel includes a motor including a stator and a rotor; a transmission unit disposed adjacent to the motor, having an opening therein, and configured to receive rotation power from the rotor and rotate the car wheel; and a rigid shaft inserted into the opening to fix the motor to a car body.

Abstract: An exterior rotor switched reluctance machine includes a stator, a rotor adjacent the stator and adjacent a housing, the housing connected to the stator. The stator further includes a back iron, a set of stator poles connected to the back iron and a set of windings disposed between the set of stator poles. The rotor, connected to a shaft and rotatively coupled to the stator, further includes a set of rotor segments. The set of windings includes a set of phases, each phase experiencing a flux linkage that varies with an angular position of the rotor. The apparatus operates as a motor in response to selectively energizing the set of phases with a set of current pulses. The apparatus operates as a generator in response to rotating the shaft.

Abstract: A motor includes a motor case, and a rotor and a stator, which are disposed in the case. The case has a tubular portion, a front cover mounted to an axial end of the portion, and a rear cover mounted to the other axial end of the portion. The rotor has a rotary shaft and the stator includes a plurality of teeth, which extend toward a central axis of the shaft and are circumferentially disposed at equal intervals. Between each circumferentially adjacent pair of the teeth, a slot extending toward the axis is formed. In each slot, a U-shaped segment is inserted in parallel with the axis. The distal ends of the segments projecting out from the slots are electrically interconnected, thereby forming an SC coil including the segments disposed circumferentially. The SC coil includes a receiving terminal, and the terminal includes leads extending in parallel to the axis.

Abstract: The invention relates to a method for producing a housing assembly (1), in particular for an electric machine, wherein a region (26) of a closure part (3) is reshaped in the form of an indentation (26?), in order to thus press material of the closure part (3) against a housing part (16) for a non-positive engagement between the closure part (3) and the housing part (16).

Abstract: A motor assembly includes a structural unit for mounting a motor, for mounting and enclosing electronic circuitry, and for providing a corridor for air to flow and cool the motor and/or the electronic circuitry. The motor assembly includes a substantially water-resistant motor that rotationally drives a fan for cooling the motor and/or rotationally drives a propeller for providing propulsion to watercraft. The electronic circuitry of the motor assembly receives and transmits instructions to a command post by way of electronic signals and distributes power to the motor. The structural unit seals the circuitry from the surrounding environment.

Abstract: A rotating electrical machine according to an embodiment includes a rotor rotatable around a rotation axis, a stator arranged to face the rotor, and a frame which accommodates the rotor and the stator and in which a refrigerant flow path is formed in a sidewall. The frame includes a through hole that penetrates from the refrigerant flow path to an outer periphery of the sidewall and is covered by a lid member.

Abstract: The invention relates to an electrical machine, particularly an alternating current generator, that can be designed as a three-phase alternator, for example, having—preferably electrical—components that are protected from access, wherein to this end there is a protective cap (47) fastened by means of at least one snap region (103), wherein the snap region (103) has a snap-in hook (92) having a snap-in hook root (106), wherein there is a bending region (109) between the snap-in hook (92) and the snap-in hook root (106), wherein the bending region (109) has a cambered surface (112, 115).

Abstract: A rotating electric machine has a first frame and a second frame disposed at one axial end of a casing. The first and second frames have a first flange and a second flange, respectively, that protrude outwardly from the casing. The first and second flanges are fastened together by a through bolt. The first flange includes a recessed portion having a first curved portion, a second curved portion, and a third curved portion, A curvature radius of the third curved portion is greater than a curvature radius of the first curved portion and a curvature radius of the second curved portion such that a concentration of stress within the third curved portion that is caused by a fastening force of the through bolt may be reduced.

Abstract: An electric apparatus with high performance and high rigidity is provided. Annular positioning stepped portions are formed at respective outer peripheral corner portions of both end portions of a stator core to extend entirely circumferentially of the stator core. An annular positioning projecting portion is formed at a first end bracket to be entirely fitted with one of the annular positioning stepped portions of the stator core. An annular positioning projecting portion is formed at a second end bracket to be entirely fitted with the other annular positioning stepped portion of the stator core.

Abstract: A stator for an electric rotating machine includes a hollow cylindrical stator core, a stator coil, an outer cylinder, and at least one restraint. The stator core is comprised of a plurality of stator core segments that are arranged in the circumferential direction of the stator core to adjoin one another in the circumferential direction. The stator coil is mounted on the stator core. The outer cylinder is fitted on the radially outer surfaces of the stator core segments so as to fasten the stator core segments together. The restraint is arranged on an axial side of the stator core and retained by the outer cylinder so as to restrain axial deformation of the stator core segments due to the fastening force of the outer cylinder.

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: [Object] An object of the present invention is to provide a substrate support structure which can prevent a crush rib from damaging components other than a substrate and brings excellent workability. [Means to solve] In a substrate support structure, a box-shaped resinous case 2 provided with a holding space section 23 is separated into a first case 21 and a second case 22, and a substrate 3 is housed in the holding space section 23. A first crush rib 41 and a second crush rib 42 are provided in the second case 22, and press and fix the substrate 3 to first case 21 by reaction force that is generated by being pressed against the substrate 3 and crushed when the both cases 21, 22 are joined together. A first guide 51 is provided in the first case 21, and guides the first crush rib 41 to the substrate 3 mounted in the first case 21 when the both cases 21, 22 are joined together.

Abstract: An electrical power supply device (10) for electrically powering equipment on a rotary rotor (2) of an aircraft (1), which rotor is driven by a shaft (5), said device (10) comprising a removable stick (11). The stick (11) includes an upper alternator (20) and an upper tube (12) secured to said shaft (5) so as to be constrained in rotation therewith, said upper alternator (20) having a plurality of upper coils (21) fastened to an upper inside peripheral surface (12?) of said upper tube (12), said stick (11) having a rod (13) carrying an upper permanent magnet (22), said device (10) having a mechanism (30) so that said rod (13) and said upper tube (12) move with distinct rotary movements, said mechanism (30) having connection means (31) so as to be connectable to a reference member (8, 9) of an aircraft (1).

Abstract: Some embodiments relate to a generator that includes an alternator and an engine. The engine includes an output shaft that is coupled to a rotor of the alternator. The generator further includes a first fan that initially directs air in a first direction which is parallel to a longitudinal axis of the output shaft. A second fan that directs air in a second direction that is orthogonal to the longitudinal axis of the output shaft. The generator further includes an enclosure such that the alternator, the engine, the first fan and the second fan are within the enclosure. In some embodiments, the generator may further include a third fan that directs air in the direction that is orthogonal to the longitudinal axis of the output shaft and a fourth fan that directs air in a direction that is parallel to the longitudinal axis of the output shaft.

Abstract: A mounting arrangement for locating a stator (10) within a casing (16) of a rotating machine comprises at least one mounting plate (12) adapted to engage with the stator (10) and the casing (16). The mounting plate (12) has a series of discrete apertures (20) therein. The apertures (20) extend through the plate (12) and are arranged in an array to provide a convoluted path which impedes the transmission of the dynamic forces through the plate (12) and into the casing (16). The apertures (20) render the plate (12) more resilient to the dynamic forces that the stator (10) experiences in operation. Each aperture (20) divides the plate (12) into portions which provide anisotropic stiffness in the radial and tangential directions.

Abstract: A common mode coil can be installed without having to increase the planar area for an inverter accommodating section so that high performance and size reduction and compactness of an inverter device can be achieved.

Abstract: A stator (32, 132, 232) or rotor for an electrodynamic machine, in particular for a torque motor acting as an internal or external rotor, comprises a plurality of partly annular plate segments (10, 110, 210) which are stacked in a manner to constitute several partly annular plate segment blocks (34, 134, 234). Combined into a ring, said blocks constitute the stator (32, 132, 232) or rotor the particular adjacent plate segment blocks (34, 134, 234) being mutually clamped by a clamping means. This clamping means already may be integrated into said plate segment blocks or it may be constituted by a housing (145, 245) of which the segments (148, 248) can be clamped against one another. If illustratively the housing (145) is emplaced externally around the stator (132) then the inside diameter of said housing may be varied during installation of the stator (132) or rotor in a manner that the housing may be positioned around the installed plate segment blocks (34, 134) and also may be radially clamped against them.

Abstract: A starter motor for an engine includes a motor casing made of electrically conductive material and an end bracket fixed to one end of the motor casing. The end bracket comprises a base with brush cages integrally formed therewith, brushes mounted in the brush cages and a conductor electrically connected to the brushes and motor casing. The base is a single piece made of electrically insulating material and coaxial mounting holes are formed in the base and motor casing for fasteners to fix the starter motor to a housing of the engine.

Abstract: Alternating current electric induction motor, in particular a motor (12-22) which is fed by a frequency variator, comprising a casing (4) which supports a rotor (9) by means of roller bearings (8) and which supports a stator (13) with a coaxial ring-shaped core (16) made of a magnetic material, characterized in that the stator (13) is provided with an auxiliary closed loop toroidal winding (20).

Abstract: A single phase, rotary electromagnetic actuator comprising first and second stator assemblies, located in oppositely facing spaced apart positions along a common central axis, permits a magnetized disc magnet rotor to rotate about the common axis free of any magnetic attractive forces normally tending to move the disc magnet longitudinally along the axis, or alternatively to be located in a position to create a desired longitudinal attractive force. The entire assembly is maintained in operative positions by a circular belt which provides an inward facing lip on each side of which the stator assemblies are seated and which determines the magnetic airgap spacing for the disc. The invention may be implemented as a servo-actuator by the inclusion of an angular position sensor that uses the actuator rotor as the magnetic field emitter, and a receiver for the magnetic field and its contacts, located in the belt lip.

Abstract: An electric generator (1) includes a casing (2) that envelops a stator (3) and a rotor (4). The casing (2) has an aperture (5) through which the generator casing inside (7) is inspectable during generator operation. A method includes inspecting during generator operation, through the aperture (5) of the casing (2), the casing inside (7).

Abstract: A generator with relatively high (Length/Diameter) aspect ratio, which may be mounted within the rotating mast of a helicopter, and which may generate power that is conditioned by a rotating power conditioning unit and delivered to the rotating rotor blades without the use of slip rings, is disclosed. The generator may be arranged to take advantage of the available space within the mast. Temperature of the mast and generator may be controlled by varying the wall thickness of the mast wall and using cooling fins on the mast and a cooling dome.

Abstract: A drive device includes a motor, a control unit, a first fastener, and a second fastener. The control unit is arranged on a side of the motor in an axis direction of the motor. The first fastener is arranged in a wall part of a cylindrical motor case of the motor opposing to the control unit, on an inner side of a peripheral wall of the motor case in a radial direction. The second fastener is tightened with the first fastener so as to connect the motor and the control unit with each other.

Abstract: An electric machine includes a stator magnetic circuit and a rotor. The magnetic circuit includes electrical conductors, which form windings of the machine. Coils formed by the windings are connected to an external unit via connection conductors, which open into an end face of the magnetic circuit. A frame sleeve envelopes the magnetic circuit and, on an output side of the connection conductors, the sleeve is extended by a lateral wall of a lid, which is pierced with a lateral exit opening through which the connection conductors can exit towards an external connector. On assembly, the connection conductors exiting the stator can be directly inserted into the exit opening of the lid before the lid is fixed to the sleeve by passing into a space provided between an internal lateral wall of the lid and a flange element of the lid.

Abstract: An alternator includes a housing having an inner surface and an outer surface, a stationary field coil component fixedly mounted to the inner surface of the housing through one or more mechanical fasteners, and a heat sink component mounted to the outer surface of the housing. The heat sink component includes one or more openings that align with corresponding ones of the one or more mechanical fasteners.

Abstract: A rotating electrical machine includes a stator and a rotor both accommodate in a frame, on which is mounted a control case to house a drive unit including an inverter. In the machine, the control case has a vibration suppression structure that suppresses vibration of the control case. The vibration suppression structure includes honeycombed ribs formed integrally with a wall surface of the control case.

Abstract: A cover structure in a motor may include a rotor, a stator having a drive coil, a connector provided so that an engaging connector is engaged in a rotation shaft direction of the rotor, a main body cover covering outer peripheries of the stator and the connector and integrally formed with a connector cover, coil terminals extended from the stator to an outer side, connector terminals supported by a terminal support part integrally formed with the connector cover and are extended at a position offset from the coil terminals in the rotation shaft direction, and a wall part which is provided on a radially inner side of the terminal support part along the connector terminals. The wall part is located on an outer side in the radial direction with respect to the coil terminals, and a space is formed on a radially inner side of the wall part.

Abstract: A motor includes a motor assembly, an end cap, a flexible insulating sleeve, and a flexible enclosure. The motor assembly includes a stator, a rotor, and wiring connected to the stator. The end-cap is coupled to the motor assembly to produce first sub-assembly. In addition, the end-cap includes an electrical fitting for feeding the wiring externally of the motor. The flexible insulating sleeve fits over at a least a portion the first sub-assembly to produce a second sub-assembly. The flexible enclosure includes a formed housing section and a connecting section. The formed housing section loosely fits over the second sub-assembly prior to tightening of the connecting section and, when the connecting section is tightened, the formed housing section tightly fits over the second sub-assembly compressing the flexible insulating sleeve to produce an insulating seal.

Abstract: An aluminum wire body, in which an aluminum or aluminum alloy electric wire and a metal to be joined are joined by solder, wherein the solder includes an oxide glass including vanadium and a conducting particle. Preferably, the conducting particle contained in the solder is 90% by volume or less and the oxide glass is 20% by volume to 90% by volume. Further preferably, the oxide glass includes 40% by mass or more of Ag2O in terms of oxides and the glass transition point is 180° C. or less.

Abstract: A heat-dissipation structure for a motor including a motor shell, a control box, and a coupling shell. One end of the coupling shell is connected to the bottom of the motor shell and the other end thereof is connected to the top of the control box and a plurality of air vents are arranged on a side wall of the coupling shell. The introduction of the coupling shell enlarges the inner space of the control box and achieves rapid heat dissipation and a better heat dissipation effect. The heat-dissipation structure features rapid heat dissipation, excellent heat dissipation effect, a simple structure, an attractive shape, and great universality.

Abstract: An axial groove is provided in an inner peripheral wall surface of a motor case of a housing of a motor actuator, and a spring installation opening is provided to the axial groove at a location adjacent to an opening end of a motor receiving hole of the motor case, which receives a motor. A damper spring is inserted into the groove through the spring installation opening. The damper spring urges the motor against first and second ridges formed in the inner peripheral wall surface of the motor case.

Abstract: An electric machine includes a plurality of windings, a stator core, and a housing. The stator core includes a substantially cylindrical outer surface with a plurality of protuberances extending from the outer surface. Each of the plurality of protuberances includes a flat side extending from the outer surface of the stator core in a radial direction and a rounded side opposite the flat side of the protuberance and extending from the outer surface of the stator core in the radial direction. The housing has a substantially cylindrical inner surface including a plurality of recesses configured to receive the plurality of protuberances on the outer surface of the stator core. Each of the plurality of recesses includes a flat side configured to engage the flat side of an associated protuberance and a round side having a contour matching the contour on the rounded side of the associated protuberance.

Abstract: A mechanically commutated electric motor is at least partially arranged in a closure apparatus for a housing. The closure apparatus includes at least a first rod-like throttle coil and a second rod-like throttle coil which are wound in opposite directions with coil wire and which are arranged parallel to one another. The first throttle coil is electrically directly coupled to a first coupling element provided for electrical coupling to the mechanically commutated electric motor, and the second throttle coil is electrically directly coupled to a second coupling element provided for electrical coupling to the mechanically commutated electric motor, such that, when the mechanically commutated electric motor is connected to the coupling elements and the mechanically commutated electric motor is operated, the magnetic fluxes (Phi1, Phi2) in the first throttle coil and second throttle coil at least partially compensate one another.

Abstract: Disclosed is a motor-driven compressor for a vehicle adapted to fix a connector of an electric motor for a vehicle compressor. The compressor for a vehicle includes a rotor configured be rotated by an electromagnetic force generated when a current flow through a coil, a stator having at least one connector fixing slot, and a connector having a body fixed to the connector fixing slot.

Abstract: A motor with an internal driver having a shell, having a stator, a rotor and a drive shaft attached to said rotor in an internal thereof; a front cover; a rear cover; ends of a drive shaft penetrating through holes of the front and rear covers to the external. The inner surface of the rear cover includes outer and inner circumferential walls and a receiving space defined by the outer and inner circumferential walls and the inner surface of the rear cover. A driver is provided within said receiving space and the outer surface of the rear cover is provided with a bearing slot to receive a bearing. An inner diameter of the inner circumferential wall is greater than the drive shaft. Said inner diameter of said inner circumferential wall is smaller than the annular diameter of the bearing in the bearing slot.

Abstract: An electric motor includes a motor casing formed with a shaft insertion hole and a motor output shaft extending in the shaft insertion hole and projecting to a speed reducing mechanism. An annular oil seal is disposed between the shaft insertion hole and the motor output shaft and the annular oil seal includes an annular seal retainer buried in the annular oil seal for reinforcement. A C-shaped stopper member extending circumferentially from a first end to a second end spaced from the first end, is held in a holding portion or a fitting groove of the shaft insertion hole, and arranged to prevent movement of the oil seal toward the speed reducing mechanism. The stopper member includes a plurality of beam segments confronting the seal retainer from an axial direction of the motor output shaft.

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 sealed electric generator includes a casing (2) housing a stator (3) and a rotor (4) connected to a shaft (5), wherein the shaft (5) is provided with a duct housing and a lead (10) carrying electric power from an exciter (8) to rotor field windings (9). The duct has a sealing unit for preventing gas contained inside of the casing (2) from reaching the exciter (8). The sealing unit has first and second seals (20, 21) defining between them a chamber (22), such that gas that leaks past a seal (20, 21) enters the chamber (22).

Abstract: A drive unit includes a motor disposed in a motor case, a controller, disposed in a controller case, and a lever. The lever includes a supported portion that is fitted on a support of the controller case in a rotatable manner, a first action point at a first distance from the supported portion, and a second action point at a second distance from the supported portion. When the lever rotates from a close state toward an open state according to an application of a first force to the first action point, the second action point abuts on a specific part on the motor case, thereby generating a second force from the second action point to the specific part in a parallel direction of the axis of the motor case, with its reaction force reversely applied from the supported portion to the support as a third force.

Abstract: In order to provide a vehicle AC generator capable of easily setting an attachment direction of a battery terminal and reducing the total shaft length of the generator, in the vehicle AC generator including a case composed of a front bracket and a rear bracket, and a rotor and a stator which are arranged in the case, the vehicle AC generator includes a battery terminal arranged on an outer circumferential portion of the rear bracket, an engaging body provided on the battery terminal, and a plurality of fitting portions to which the engaging body is fitted.

Abstract: The different electrical components and cables arranged in the B flange of an electric motor can be installed only with difficulties and are complicated and time-consuming due to the restricted space conditions in the B flange. In order to improve this, it is proposed to recess the B flange's 3 front side 10 facing away from the electric motor 1 at least in sections with respect to an imaginary surface normal to the longitudinal axis 15 of the electric motor 1 in the direction toward the motor housing 2, and to shape the B flange cover's 9 front face resting against the B flange 3 in a mirror-inverted manner to thereby improve the accessibility to the inside of the B flange 3.

Abstract: Hobby servo blocks are provided. In certain circumstances, servo blocks may increase a servo's load-bearing capabilities by helping to isolate the lateral load from the servo spline and case. The extreme versatility of servo blocks allow users to create complex, extremely rigid, structures with ease using standard servos. The robust framework acts as a servo exoskeleton, greatly enhancing the mechanical loads the servo can withstand. Additionally, servo blocks may include a hub pattern that is repeated throughout the framework to allow endless attachment options.

Abstract: An electromechanical device includes a rotor having a magnetic back yoke with a cylindrical shape, and at least one rotor magnet arranged along an outer periphery of the magnetic back yoke in a cylindrical manner, a stator having at least one air-core magnetic coil arranged along an outer periphery of the rotor in a cylindrical manner, and a coil back yoke with a cylindrical shape disposed on an outer periphery of the magnetic coil arranged in a cylindrical manner, and a casing adapted to cover the stator and the rotor, wherein at least a part of the casing is formed of carbon fiber reinforced plastic.

Abstract: A boat lift drive housing for containing a control box, electric motor and gear head for raising and lowering a boat lift. The housing includes front and rear coaxial openings for access to the gear head. The housing further includes an eyebrow cantilevered over an opening in the housing through which a key switch extends such that the key switch is protected from the sun, rain, snow and ice. The housing further includes a pair of bottom openings, with one bottom housing permitting access to a drive shaft of the electric motor and with the other bottom opening holding a tool for driving the drive shaft of the electric motor. The housing further includes a shape tailored to the control box, electric motor and gear head to minimize extra connections within the housing.

Abstract: A stator includes a stator core formed from a plurality of split cores arranged in a circumferential direction, and a cylindrical body that surrounds the stator core from a periphery and secures the stator core. The split cores each have a first end portion on one end in the circumferential direction, and a second end portion on the other end in the circumferential direction. The first end portion has a protruding portion that protrudes outward in the circumferential direction, and the second end portion has a depressed portion that is depressed inward in the circumferential direction and fits together with the protruding portion of the first end portion of an adjacent split core.