Abstract: An electric motor includes a stator and a rotor rotatably mounted to the stator. The stator includes a housing having an open end, a plurality of adhesive strips applied on an inner surface of the housing, a plurality of magnets bonded to the inner surface of the housing by the adhesive strips, and an end cap assembly mounted to the opening end of the housing. The adhesive covers at least 70% of the area of the outer surface of each magnet after the magnets are assembled to the housing.

Abstract: The present teaching relates to a method/apparatus for a magnetic sensor. The apparatus of the magnetic sensor resides in a housing and includes an input port and an output port, both extending from the housing. The apparatus also includes an electrical circuit which comprises a magnetic field detecting circuit, configured to detect an external magnetic field and output a magnetic induction signal that is indicative of information related to the external magnetic field, an output control circuit coupled between the magnetic field detecting circuit and the output port, and a state control circuit coupled with the output control circuit and configured to determine whether a predetermined condition is satisfied and signal the same to the output control circuit.

Abstract: The present teaching relates to a magnetic sensor that comprises a housing, an input port and an output port, both extending from the housing and the input port being connected to an external alternating current (AC) power supply, and an electrical circuit. The electrical circuit comprises an output control circuit coupled with the output port and configured to be responsive to a magnetic induction signal to control the magnetic sensor to operate in a state in which a load current flows through the output port when a predetermined condition is satisfied, and operate in another state when the predetermined condition is not satisfied. The operating frequency of the magnetic sensor is positively proportional to the frequency of the external AC power supply.

Abstract: Systems and methods for the construction of components such as laminations for the stator core of an ESP motor wherein particles of different materials are mixed and pressed together at an elevated temperature to form a composite material in the desired lamination shape. The materials are selected to provide characteristics such as high magnetic permeability from one material and high thermal conductivity from the other material. The particles of the different materials are pressed together at a temperature that is sufficiently high to fuse the particles together and form a composite material, but is also sufficiently low that the materials are not sintered. The individual materials therefore retain their original characteristics, and the composite material benefits from the high magnetic permeability of the first material and the high thermal conductivity of the other material.

Abstract: A rotor assembly comprises a number of rotor segments forming a rotor structure and a central structure connected to the rotor structure and at least partially arranged between at least two of the rotor segments, for example surrounded by the rotor structure. A wind turbine generator comprising a stator assembly and said rotor assembly and a wind turbine comprising such a generator are also provided.

Abstract: A sensor apparatus for detecting a wheel speed of a vehicle has a rod-shaped sensor carrier and a sensor, which is introduced into the sensor carrier and, in order to detect the wheel speed, senses the rotation of a rotor rotating together with the wheel. The sensor apparatus has a carrier structure for accommodating the sensor and a potting compound for filling the sensor carrier. The surface, in particular the lateral surface, of the sensor carrier is formed by a plurality of interrupted, metal surface areas of the carrier structure and areas filled with the potting compound, wherein at least two metal surface areas are in the form of contact surfaces.

Abstract: A PWM motor drive device includes: a time counter that counts a time of a polarity of a motor phase signal; a register that retains the time; a zone setting circuit that splits the time into arbitrary zones and generates an arbitrary zone set for which a phase of motor current is adjusted; and a zone correction circuit that compares a motor current phase signal indicating the phase of the motor current with the motor phase signal to correct the zone set.

Abstract: A rotor has a projection part projected from an inner wall of a central hole part toward a central axis and a rib part defined between opening parts adjacent with each other in a circumferential direction. A first imaginary straight line is defined to extend from the central axis outward in a radial direction through a center of the projection part. The projection part is formed so that the first imaginary straight line passes the opening part. A second imaginary straight line is defined to extend from the central axis outward in the radial direction through a center of the rib part. The rib part is formed so that the second imaginary straight line passes a center of a pole part or an intermediate position between pole parts adjacent with each other in the circumferential direction.

Abstract: A motor rotor and a method for manufacturing a motor rotor, enabling crimping of the resolver rotor at low cost with less influence on the detection accuracy. A motor rotor includes a resolver rotor and a rotor shaft to which the resolver rotor is affixed by crimping. The rotor shaft includes a first stepped section with which a crimping punch makes contact to deform the first stepped section, a second stepped section with which an end surface of the resolver rotor makes contact, and a cutout groove formed in a surface which is located near the first stepped section and with which an inner peripheral hole section of the resolver rotor makes contact. In the crimping operation, the first stepped section of the rotor shaft is bent within the cutout groove to form a crimping protrusion which presses the end surface of the resolver rotor.

Abstract: Provided is a device for optimizing a diffusion section of an electron beam, comprising two groups of permanent magnets, a magnetic field formed by the four magnetic poles extending the electron beam in a longitudinal direction, and compressing the electron beam in a transverse direction, so that the electron beam becomes an approximate ellipse; another magnetic field formed by the eight magnetic poles optimizing an edge of a dispersed electron-beam bunch into an approximate rectangle; by controlling the four longitudinal connection mechanisms so that the upper magnetic yoke and the lower magnetic yoke of the first group of permanent magnets move synchronously towards the center thereof thereby longitudinally compressing the electron beam in the shape of an approximate ellipse, and the upper magnetic yoke and the lower magnetic yoke of the second group of permanent magnets move synchronously towards the center thereof thereby longitudinally compressing the electron beam in the shape of an approximate rectangl

Abstract: A magnetic encoder structure according to an exemplary embodiment of the present invention includes: a back plate; and a magnet rubber which has a ring shape, and is vulcanized and attached to a rear surface of the back plate, in which the magnet rubber has a plurality of protruding portions which protrudes from an adhesive surface that is attached to the back plate, and groove portions which are formed between the protruding portions, and the protruding portions and the groove portions are repetitively disposed in a rotation direction of the magnet rubber.

Abstract: A motor of a ceiling fan includes a stator, a shaft, a linking seat, and a rotor. The stator has a core with an assembly hole. The linking seat couples with the core and has an axial hole in alignment with the assembly hole in an axial direction of the shaft firmly resting in the axial hole. The rotor is rotatably arranged around the shaft.

Abstract: An electric motor (1), comprising a primary part (2a, 2b) having an iron-free winding device (3) that comprises at least two phases (6), wherein one phase (6) comprises at least two phase windings (4) and at least one electrical connecting element (5), a secondary part (7a, 7b) having an even number of magnetic poles (8), which are arranged alternatively on the secondary part (7a, 7b), wherein the winding device (3) is arranged in an air gap (9) between the primary part (2a, 2b) and the secondary part (7a, 7b) relative to an axis (10a, 10b), in such a manner that each phase winding (4) of a phase (6) is arranged opposite a respective magnetic pole (8) and all magnetic poles (8) are usable simultaneously for force formation.

Abstract: The present invention relates to a resolver having a stator for detecting the rotational position of a rotor rotating at the inner center thereof. The stator includes: a stator core having a cylindrical shape; a plurality of excitation windings attached to the inner surface of the stator core at a predetermined distance in the circumferential direction, each of the plurality of excitation windings being tightly wound; a plurality of sine output windings stacked and attached to the patterns of the excitation windings in the circumferential direction, each of the plurality of sine output windings being loosely wound; and a plurality of cosine output windings stacked and attached to the patterns of the excitation windings in the circumferential direction, the sine output windings and the cosine output windings being alternately attached such that the sine output windings and the cosine output windings have the same winding distribution.

Abstract: A brush-less motor is disclosed, comprising a stator, a rotor, a plurality of field-effect tubes, a commutation circuit board, a control circuit board and a motor end cap, wherein the motor end cap comprises a front end cap and a rear end cap which are mutually fixedly connected to form an integrated motor; the plurality of field-effect tubes is directly fixed at the motor front end cap; the commutation circuit board and the control circuit board are both connected to the motor front end cap. The field-effect tubes of the brush-less motor are directly installed on a housing of the motor, ensuring good heat dissipation, saving heat sinks and cost; the integrated brush-less motor runs more smoothly and imposes requirements which are not as high as those imposed by the split brush-less motor on the accuracy of the housing. Thus, the reject ratio of products during batch production is reduced.

Abstract: A synchronous motor includes a stator with a stator winding, and a rotor on which magnetic poles made of permanent-magnetic material are formed, each pole having a cambered outer contour, especially an outer contour cambered radially outwards, in particular, 2×p individual poles being salient in the circumferential direction, p being the number of pole pairs.

Abstract: A synchronous electric motor having a structure for reducing cogging torque generated by the positioning error of a permanent magnet. Protrusions are alternately arranged in regions A and B in the circumferential direction of an iron core. Therefore, with respect to neighboring magnets positioned on both sides of the first protrusion, in region B, where the protrusion does not exit, ends of the neighboring magnets are attracted to each other by magnetic force. On the other hand, with respect to the neighboring magnets positioned on both sides of the second protrusion, in region A, where the protrusion does not exit, ends of the neighboring magnets are attracted to each other by magnetic force resulting in being inclined in opposing directions, and thus the generated cogging torque is significantly reduced.

Abstract: An electric motor is provided. The electric motor comprises a stator and a rotor rotatable about an axis and spaced at least in part radially outside the stator. The rotor includes a plurality of arcuately spaced apart pole segments, a plurality of arcuately spaced apart magnets alternately arranged with the pole segments such that each of the pole segments is positioned between an adjacent pair of the magnets, a rotor can at least in part supporting the pole segments and the magnets, and a plurality of pegs. Each of the pole segments defines an opening therethrough and includes a generally arcuately extending wall structure positioned radially outside of and at least in part defining the opening. Each of the pegs extends through a corresponding one of the openings to secure a corresponding one of the pole segments relative to the can.

Abstract: A rotor (100) having a first plurality of laminates (110), comprising a first plurality of protrusions (120) located at a periphery of each of the first plurality of laminates, and a second plurality of laminates (1101), arranged differently from the first plurality of laminates (110) around a shaft hole (132), comprising a second plurality of protrusions (120?) located at a periphery of each of the second plurality of laminates, wherein the first plurality of protrusions are asymmetric and/or angularly offset from the second plurality of protrusions, and wherein the second plurality of protrusions are asymmetric and/or angularly offset from the first plurality of protrusions. The rotor further having a plurality of magnets (115), each inserted between the first plurality of protrusions and/or the second plurality of protrusions, wherein reactive forces operate to hold the plurality of magnets.

Abstract: In an electromechanical energy converter having an outer body and an inner body, which are mounted movably relative to one another about an axis of rotation, an outer body according to the invention surrounds an annular structural element, a permanent magnet and a support ring which is received concentrically in the structural element. The support ring comprises a recess to receive the permanent magnet, and the recess has a boundary surface which extends parallel as to a radius of the axis of rotation.

Abstract: A rotor arm for an electrical machine having a support pot, which includes a hub for the mounting of a drive shaft, for mounting at least one magnetic element is provided. The rotor arm includes a supporting disk arranged on a support pot at a distance axially from the hub. The supporting element has a passage aligned with the hub for mounting the drive shaft.

Abstract: A rotor includes a rotor body and a plurality of permanent magnet received in the rotor body. The rotor body separately defines a plurality of recess troughs on an outer wall of the rotor body. Side surfaces of each recess trough include a bottom surface and two side surfaces. The bottom surface is coupled between the two side surfaces. The bottom surface is a planar surface, and each side surface is a curved surface. The rotor body further defines a plurality of receiving grooves around a circumferential direction of the rotor body and extends along the vertical axis of the rotor body. Each receiving groove receives at least one permanent magnet. Each two adjacent receiving grooves are positioned under one bottom surface, and sidewalls of each two adjacent receiving grooves and the corresponding one bottom surface cooperatively form a T-shaped region.

Abstract: A motor for washing machines having a first insulator of the motor which surrounds a lower portion of a stator core of a stator of the motor and includes a ring-shaped mounting unit including a plurality of connection bosses so as to mount the stator on a tub of a washing machine, and at least one heat dissipation hole is provided on the mounting unit, thereby improving a cooling effect of the stator core.

Abstract: A method for manufacturing an interior magnet rotor core motor is described herein. The method includes attaching a resilient material to an inner rigid structure configured to engage a shaft associated with the motor, engaging the structure with the motor shaft, positioning the shaft and structure assembly with respect to the rotor core, and affixing the resilient material to the rotor core.

Abstract: A method for assembling rotors which is applicable to a large axial gap type permanent magnet rotating machine is provided. A permanent magnet rotating machine comprising: a rotating shaft; at least two rotors comprising a table-like structure and permanent magnets attached thereto, the table-like structures being connected to the rotating shaft and being disposed in an axial direction of the rotating shaft; and a stator comprising a table-like structure and stator coils around which a copper wire is wound, said stator being disposed in a gap formed by the rotors so that the stator being separated from the rotating shaft, is manufactured by the following steps of: assembling the two rotors such that a predetermined gap is formed therebetween; and mounting the magnets on the table-like structures by inserting the magnet from the radially outer side of the table-like structures towards the center of the rotation with the assembled state being maintained.

Abstract: An electric motor that generates mechanical energy whilst increasing both the motor efficiency and the mechanical power density. The electric motor includes: a plurality of disk surfaces having a main longitudinal axis; a plurality of stationary support structures; and a rotating shaft affixed to the disk surfaces. Each disk surface is coupled to an array of offset magnets. The magnets are arranged as matching magnetic pairs on two adjacent disk surfaces to create a plurality of magnetic fields between the matching magnetic pairs. The magnetic fields are titled at an angle A with respect to the main longitudinal axis. Each stationary support structure has an electromagnetic coil array located in-between each of the matching magnetic pairs, which provides an axial magnetic field when voltage is applied on the electromagnetic coil. Each of the electromagnetic coil array is titled at said angle A with respect to the main longitudinal axis.

Abstract: The invention concerns a rotor (1) for an electric drive motor of a refrigerant compressor with a cylinder ring (2), several permanent magnets (14) resting on the radial inside of the cylinder ring (2), each permanent magnet (14) forming a ring section, and fixing elements (15) between the permanent magnets (14), said fixing elements (15) engaging a fixing geometry (4, 16) of the cylinder ring (2). It is endeavoured to simplify the manufacturing of such a rotor. For this purpose, the cylinder ring (2) is located in a carrier (5), which comprises a bottom (6) and a circumferential wall (7), the permanent magnets (14, 14a, 14b) resting on the bottom (6), and each fixing element (15, 15a, 15b) comprising at least one projection (17, 18), which covers a side (24) of the permanent magnet (14, 14a, 14b) facing away from the bottom (6).

Abstract: An electric machine can include a stator, a rotor frame and a pole arrangement with: plural segment pieces disposed circumferentially around, and fastened to, the rotor frame; permanent magnet pieces positioned on inclined side edges of each segment piece; and plural pole pieces disposed circumferentially around the rotor frame and disposed alternatingly with the segment pieces. The magnet pieces are pressed between inclined side edges of the pole pieces and the inclined side edges of the segment pieces. The segment pieces, the permanent magnet pieces and the pole pieces form a closed ring around the outer surface of the rotor frame, with plural such rings being arranged after each other in an axial direction. An axial air channel can pass through the rings, and at least one radial air duct (R1, R2) between the rings.

Abstract: An electric motor includes: a ring-shaped stator including a field coil; and a rotor holding a permanent magnet in a magnet holding portion on an outer circumference thereof in an exposed state and being supported to be rotatable about a rotary shaft core in an inner space of the stator, wherein the magnet holding portion is configured to have a magnet insertion portion and a pair of regulation bodies, and the permanent magnet is configured to include a cylindrical outer wall surface, a rear wall surface, a pair of side wall surfaces, and a pair of engaged surfaces.

Abstract: According to aspects of the present invention there are provided synchronous electric machines including a stationary electromagnetic stator, a rotor having a rotational axis, wherein the rotor includes a cylindrically shaped structure comprising a plurality of concentric layers, and a plurality of permanent magnets disposed on the cylindrical shaped structure.

Abstract: An object of the present invention is to provide a motor rotor support suitable for an axial gap motor and a method for manufacturing the same. The motor rotor support for supporting a magnetic body disposed on a rotor of the motor is configured by laminating single materials each formed from a hot-worked material or a cold-worked material preferably composed of an 18Mn-18Cr nonmagnetic steel.

Abstract: Rotor for motor or generator, which rotor (11) includes a rotor ring (12), which rotor includes a yoke formed by yoke segments (13) which by arrangement to the rotor ring (12) forms a complete yoke. The yoke segments (13) are provided with one or more magnet blanks (19), which magnet blanks (19) are formed by one or more permanent magnets (18).

Abstract: A permanent magnet rotor comprising a rotor rim and a plurality of permanent magnet modules arranged on the outer or inner circumference of the rotor rim, the permanent magnet modules extending generally along an axial direction and being of substantially constant axial-cross section, and comprising a base adapted to be fixed to the rim of the generator rotor, one or more permanent magnets, and one or more pole pieces, wherein each of the permanent magnets has a circumferential magnetic orientation and is substantially rectangular in axial cross-section and wherein each of the permanent magnets is inclined with respect to the central radial plane of the module.

Abstract: Systems for improving electric storage batteries and their use for powering vehicles.

Abstract: A permanent magnet rotor comprising a rotor rim and a plurality of permanent magnet modules arranged on the outer or inner circumference of the rotor rim, the permanent magnet modules extending generally along an axial direction and being of substantially constant axial-cross section, and comprising a base adapted to be fixed to the rim of the generator rotor, one or more permanent magnets, and one or more pole pieces, wherein the permanent magnet modules comprise an axial cooling channel extending substantially along the length of the modules.

Abstract: A motor may include a stationary section and a rotating section. The stationary section may include a stator core having a plurality of teeth and a coil including a conducting wire wound around each tooth. The rotating section may include a plurality of magnets arranged radially inside the coil, a rotor core, and a magnet holder holding the magnets. Each magnet may have a circumferential end face at each of both end portions in the circumferential direction. The magnet holder may include a columnar portion axially extending between adjacent magnets, and a wall surface spreading in the circumferential direction from the columnar portion. The wall surface may come into contact with a surface arranged radially outside the circumferential end face of the magnet. The circumferential end face on at least one side of the magnet may face the columnar portion with a gap interposed therebetween in the circumferential direction.

Abstract: A rotating device includes: a hub that is rotatably supported by a base, on which a recording disk is to be mounted; a stator core fixed to the base, the core having a ring portion and multiple salient poles that radially extend from the ring portion; and a magnet fixed to the hub, the magnet having multiple magnetic poles arranged along its circumference on its side surface on the salient pole side. The magnet is arranged such that its side surface on the salient pole side faces a side surface of each salient pole and a side surface of a portion of the hub that faces the stator core along a rotational axis direction.

Abstract: A permanent magnet rotor for use on an electrical generator comprises a hub having an outer peripheral surface and an inner peripheral bore centered on an axis. The inner peripheral bore is provided with a screw thread at least over a portion of an axial dimension. Permanent magnets are mounted on the outer peripheral surface of the hub. A containment band is positioned radially outwardly of the magnets, holding the magnets and the hub together. The hub, a generator rotor incorporating the permanent magnet rotor, and a generator incorporating the permanent magnet rotor are also disclosed and claimed in this application.

Abstract: A brushless permanent-magnet motor includes a rotor, a magnet set mounted at the rotor, a stator coaxially surrounding the magnet set in a coaxial manner relative to the rotor, and a bushing set between the magnet set and the stator in a coaxial manner relative to the rotor and the stator. The stator has a plurality of teeth spaced around the inner perimeter thereof and a retaining crevice defined between the distal front end portions of each two adjacent teeth remote from the inner perimeter. The bushing has a plurality of locating ribs respectively engaged into the retaining crevices of the stator. Thus, the brushless permanent-magnet motor has a high level of structural stability, and can effectively reduce the air-gap flux density variation and instant cogging torque and torque ripples and solve vibration and noise problems.

Abstract: A brushless permanent-magnet motor includes a stator, a rotor rotatably mounted within the stator in a coaxial manner, a magnet set including a plurality of magnet components mounted around the periphery of the rotor and leaving a gap between the magnet set and the stator, and two locating plates made from a magnetically conductive material and respectively mounted at two opposite sides of the rotor for synchronous rotation with the magnet set and the rotor. Thus, the brushless permanent-magnet motor has a high level of structural stability, and can effectively improve the air-gap flux density and electromagnetic torque under the rated revolving speed to further enhance the performance of the motor.

Abstract: A rotor for an electric machine includes a base body and a plurality of support bodies that are fixed on the base body and support permanent magnets. The rotor is characterized in that two first support bodies that are located at a distance from one another form a receiving region for a second support body, allowing the first support body to be positively connected to the second support body.

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: A rotor of an electric motor is provided in which a permanent magnet holding member can be assuredly fixed to a rotor main body and the rotor main body can be easily worked and inexpensively manufactured. In the rotor, a plurality of permanent magnets 21 are held in a permanent magnet holding member 29 made of a synthetic resin and fixed to an outer peripheral part of a cylindrical rotor main body 28. An outer peripheral surface of the rotor main body 28 is a cylindrical surface. Rotation prevention recessed parts 30 are formed at a plurality of parts in the circumferential direction of the outer peripheral part in both end parts of the rotor main body 28. The permanent magnet holding member 29 includes annular parts 31 which come into close contact with the outer peripheral parts of both end faces of the rotor main body 28 and connecting parts 32 which connect both the annular parts 31 on the outer peripheral surface of the rotor main body 28 and hold the permanent magnets 21.

Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes an iron core and permanent magnets. The iron core includes a cylindrical connection portion and ten magnetic pole portions. The cylindrical connection portion surrounds a rotation shaft. The ten magnetic pole portions, the number of which corresponding to the number of poles, are disposed radially outside the connection portion. The connection portion and the magnetic pole portions are integrated with each other. The permanent magnets are disposed between the magnetic pole portions. The magnetic pole portions include flange portions that cover parts of radially outer surfaces of the permanent magnets while allowing at least parts of the radially outer surfaces to be exposed. Each of the permanent magnets includes a tapered portion in at least a part thereof, and the tapered portion has a length in a direction perpendicular to the radial direction that decreases radially inward.

Abstract: A rotator member 300 includes a tubular sleeve 301 having a first end surface and a second end surface, a plurality of magnet segments 311 circumferentially disposed at a radially outside of the sleeve 301, and a tubular member 321 adapted to cover the magnet segments 311 from a radially outside to hold the magnet segments 311 between the tubular member 321 and the sleeve 301. The sleeve 301 has an inner circumference surface that includes a tapered surface that gradually and outside the radial direction expands in a direction from the first end surface toward the second end surface.

Abstract: The present disclosure relates to a radial and axial flux motor using integrated windings, which includes a rotor which includes a rotor core having a shape of a hollow cylindrical case, and permanent magnets for an inner lateral surface and permanent magnets for a ceiling surface that are coupled to the inner lateral surface and the ceiling surface of the rotor core respectively, and which is rotated about a shaft, and a stator which includes a stator core and windings coupled to the stator core and which is installed in the rotor. Therefore, a radial flux motor and an axial flux motor are integrated into one motor to be able to increase both efficiency and output.

Abstract: A motor includes: a rotor comprising: a rotary shaft; a magnetic body rotatable together with the rotary shaft; and first and second permanent magnets fixed on an outer circumference or an inner circumference of the magnetic body, and a stator comprising: an iron core arranged around the rotor; and a coil for exciting the iron core.

Abstract: In one aspect, a moisture resistant rotor sleeve is provided. The rotor sleeve includes a plurality of stacked laminations forming a sleeve having an outer periphery, an inner periphery, and spaces between adjacent laminations. The rotor sleeve also includes a sealant applied into the spaces between the adjacent laminations, wherein the sealant seals the spaces to prevent air from traveling through the spaces of the sleeve between the inner periphery and the outer periphery.

Abstract: Permanent magnet type rotating electrical machine with rotor core including a plurality of magnet insertion holes, each having a substantially rectangular cross section, for each magnetic pole. A nonmagnetic section is formed at both ends of the magnet insertion hole in a circumferential direction. Between adjacent magnet insertion holes, a bridge section mechanically connects a rotor core section on the outside of the magnet insertion hole and a rotor core section on the inside thereof. Clearance sections for a corner of the permanent magnet inserted in magnet insertion hole projected in the circumferential direction and a radial direction of the rotor are provided at a corner between surface of the magnet insertion hole on the bridge section and a surface on the outside of the rotor and at a corner between surface of the magnet insertion hole on the bridge section and a surface on the inside of the rotor.

Abstract: An electric motor, especially a brushless PMDC motor, has a stator and a rotor rotatably installed inside of the stator. The stator has a housing with an open end, an end cap fixed to the open end of the housing, a stator core fixed to an inner surface of the housing, and windings wound on the stator core. The rotor includes a plurality of permanent magnetic poles. The housing has a flange bent inwardly from the open end of the housing and abutting against the end cap inwardly and axially to thereby fix the end cap to the housing. The length of the flange measured along the circumferential direction of the housing is greater than half of that of the housing.