Abstract: In an example, a rotor for an electric motor includes an inner hub, an outer rim, and a plurality of slats. Each slat of the plurality of slats has a first end at the inner hub and a second end at the outer rim. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle. Additionally or alternatively, a rotor for an electric motor includes a housing that includes a first retaining structure and a second retaining structure that are configured to apply a force that is directed radially outward against a magnet to hold the magnet against the housing. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle.

Abstract: A rotating device according to an embodiment includes a motor, an output gear to transmit the rotation of the motor to the external device, and a housing accommodating the motor and the output gear. The motor is held by holding parts formed at the housing via an adhesive having elasticity. The adhesive having elasticity is disposed between surfaces perpendicular to an axial direction in the holding parts of the housing, and a first end part and a second end part-of a frame.

Abstract: A motor includes a stator having a winding, and a rotor. The rotor rotates by receiving a rotational magnetic field generated by drive current supplied to the winding. The winding includes a first winding and a second winding, the first and second windings both being excited at the same timing by the drive current. The first winding and the second winding are connected in series. The rotor includes a first pole section and a second pole section. The second pole section faces the second winding at the rotation position of the rotor at which the first pole section faces the first winding. The magnetic force exerted on the stator by the second pole section is weaker than that exerted by the first pole section.

Abstract: A brushless direct-current (BLDC) motor is provided with a stator assembly including a stator core and stator windings wound around stator teeth, a rotor shaft extending along a longitudinal axis, and a rotor including a rotor core mounted on the rotor shaft supporting at least one permanent magnet. A circuit board is provided including a main body and at least one leg radially projecting from the main body to support at least one magnetic sensor near the permanent magnet. The leg of the circuit board oriented along a radial plane that intersects the stator windings.

Abstract: A radial flux electric machine includes a rotor configured to rotate about an axis of rotation, a plurality of electromagnetic coils, and a stator. The stator may have an annular stator ring and a plurality of core tooth-portions extending in a radial direction. The annular stator ring and the plurality of core tooth-portions may be integrally formed of a Soft Magnetic Composite (SMC). The SMC may include one or more isotropic ferromagnetic materials, a magnetic saturation induction of greater than or equal to about 1.6 Tesla, and an electrical resistivity greater than 10 micro-ohm/m.

Abstract: A sensor magnet includes a first magnetic pole part including a magnetic pole of a first polarity and a second magnetic pole part including a magnetic pole of a second polarity. A thickness of the first magnetic pole part in a direction toward a magnetic sensor is larger than a thickness of the second magnetic pole part in a direction toward the magnetic sensor.

Abstract: The rotor of a rotor assembly for an electric machine includes first magnetic structures utilized for torque production in the electric machine. Second magnetic structures including second magnetic poles not utilized for torque production in the electric machine are polymer-bonded to at least one of the rotor and the rotor shaft.

Abstract: A stator to which a power supply lead wire for supplying electric power is connected, includes a stator core, a winding wound around the stator core, a winding terminal connected to the winding, a circuit board connecting the power supply lead wire and the winding terminal to each other and having a surface facing the stator core, a power supply terminal provided on the surface and connected to the power supply lead wire, and a wiring pattern provided on the surface and connecting the winding terminal and the power supply terminal to each other.

Abstract: A motor comprises: a shaft; a permanent magnet rotor in which a permanent magnet and a gear member 32 are united; and a stator, arranged facing the permanent magnet. The gear member 32 has a pinion 33 and a mounting part 34. The mounting part 34 has: a circumferential-direction constraining part 34a, which constrains the circumferential movement of the permanent magnet; axial-direction constraining parts 34b, 34c, which abut both the top and bottom surfaces of the permanent magnet, so as to constrain the axial movement of the permanent magnet; and a plurality of elastic pieces 34d that apply a radially outward biasing force to the inner peripheral face of the permanent magnet.

Abstract: An electric actuator includes: a motor part, having a motor shaft that extends in an axial direction and is rotated in both directions; a deceleration mechanism, connected to the motor shaft; a circuit board, electrically connected to the motor part; an output part, having an output shaft to which rotation of the motor shaft is transmitted through the deceleration mechanism; a sensor magnet, attached to the motor shaft; and a motor part sensor, detecting a magnetic field of the sensor magnet and detecting rotation of the motor shaft. The motor part has a rotor magnet that is fixed to the motor shaft. The rotor magnet and the sensor magnet each have multiple magnetic poles in a circumferential direction around the motor shaft. The magnetic poles of the rotor magnet and the magnetic poles of the sensor magnet are disposed to be shifted from each other in the circumferential direction.

Abstract: In one embodiment, a generator includes a rotor configured to rotate in cooperation with a stator to generate electrical power. An exciter of the generator includes at least one circuit board, a stationary exciter stator, and a control circuit. The circuit board is mechanically coupled to a rotor of the generator and includes at least one coil of an electrical conductor. The stationary exciter stator is configured to induce a current in the at least one coil of the at least one circuit board. The control circuit is configured to modify the current from the at least one coil and provide the modified current to a field of the generator.

Abstract: A permanent-magnet electric motor includes an annular stator core, a rotor core, and a rotating-position detection sensor. In each of a plurality of magnet insertion holes formed in the rotor core, a rare-earth magnet and a ferrite magnet are disposed adjacent to each other in an axial direction of the rotor core. The rotor core has an axial length longer than an axial length of the stator core. The rare-earth magnet is disposed in each of the magnet insertion holes to be opposed to the stator core in a radial direction of the stator core. The ferrite magnet disposed in each of the magnet insertion holes is disposed between the rare-earth magnet disposed in the corresponding magnet insertion hole and the rotating-position detection sensor.

Abstract: The present invention relates to the field of motor technologies, and provides a motor, a gimbal and a mechanical arm having same. The motor includes a rotary shaft, a first magnetic element, a first circuit board and a second circuit board. The first magnetic element is mounted on the rotary shaft and is capable of rotating with the rotary shaft. The first circuit board is mounted on the rotary shaft and disposed opposite to the first magnetic element. The first circuit board includes a coil circuit and the coil circuit faces toward the first magnetic element. The second circuit board is mounted on the rotary shaft, the second circuit board including an electronic speed control circuit, the second circuit board being electrically connected to the first circuit board. In the motor in the present invention, the second circuit board including the electronic speed control circuit is mounted on the rotary shaft, so that space of the motor can be properly used, thereby making a structure of the motor compact.

Abstract: An electro-hydraulic motor-pump unit, MPU, having a pump for conveying a hydraulic fluid in a hydraulic system, an electric motor coupled to the pump for driving, a control coupled to the electric motor and arranged for actuating and/or feedback-controlling the electric motor, and a housing, wherein at least one sensor is disposed in a sensor receiving means integrated in the housing and is electrically connected with the control. Additionally, the invention relates to a hydraulic system comprising hydraulic lines and connected to the hydraulic lines an MPU of the invention with at least one integrated pressure sensor.

Abstract: A record player includes a turntable, a drive motor, a non-contact transmission mechanism, a tone arm, and a housing. The non-contact transmission mechanism includes a drive-side rotor and a magnetic member. The drive-side rotor is rotated by a driving force of the drive motor. The drive-side rotor is formed of a permanent magnet. The magnetic member is constituted of a soft magnetic body. The turntable is rotated according to the rotation of the drive-side rotor by an attraction force acting on the magnetic member from the permanent magnet.

Abstract: In a brushless motor having a rotor in which a drive magnet 43 and a position detection magnet 44 are fixed to the inside of a rotor case 44, along the axial direction, an annular separation plate 45 having positioning parts 45a and 45b for positioning these in the circumferential direction is disposed between the drive magnet 43 and the position detection magnet 44. Thereby, the magnetic influence of the drive magnet can be limited, and thus a highly reliable position detection signal can be obtained.

Abstract: A brushless motor includes a case fixed onto a yoke to cover an outer surface of the yoke except one end of the yoke in the axial direction, a frame fixed onto the one end of the yoke, a first bearing fixed onto the frame and configured to rotatably support a first end of a rotating shaft in the axial direction, a second bearing fixed onto the case, and configured to rotatably support a second end of the rotating shaft which is closer to the magnet than the first end, the second bearing including a receiving surface that contacts the second end in the axial direction, an energizing member configured to force the rotating shaft from a first bearing side to a second bearing side, and a wiring substrate disposed between the stator and the case in the axial direction and configured to electrify the coil.

Abstract: There is provided a motor drive control device comprising: a temperature detection unit to detect a temperature of a motor; a rotational frequency detection unit to detect a rotational frequency of the motor based on an output of a rotational position sensor provided in the motor; a supply voltage detection unit to detect a supply voltage; a load calculation unit to calculate a magnitude of a load of the motor based on a detection result of the supply voltage detection unit; an advance angle instruction unit to set an advance angle instruction value based on a detection result of the temperature detection unit, a detection result of the rotational frequency detection unit and a calculation result of the load calculation unit; and a motor drive unit to supply a driving electric power to the motor based on a speed instruction value relevant to a rotational speed of the motor and the advance angle instruction value set by the advance angle instruction unit.

Abstract: The motor comprises a rotary unit, a stationary unit disposed around the rotary unit, and a bearing mechanism. The rotary unit comprises a plurality of magnets, a rotor core, a resin portion which covers the plurality of magnets and the rotor core. The rotor core comprises a ring-shaped inner core portion disposed at a radially inner side of the plurality of magnets, an outer core portion, and a plurality of connecting portions which radially connects the plurality of core elements, which are disposed between the plurality of magnets, and the inner core portion. The resin portion comprises an upper resin portion and a lower resin portion. The upper resin portion includes a plurality of gate holes.

Abstract: An electronically commuted electric motor with a stator and a rotor is disclosed that has permanent magnets distributed a circumferential direction to determine the magnetic field of the rotor, whereby at least one sensor makes the position or speed of the rotor recordable through direct sampling of the magnetic field of the rotor. The sensor is spaced from the stator in a way that the stator field is recorded by the sensor only to a low extent or not at all, and whereby magnetic flux-guiding elements are disposed on a front side of the rotor, which move along with the rotor and guide at least a part of the magnetic field of the rotor to the sensor. The flux-guiding elements viewed in the circumferential direction of the rotor are positioned respectively between two permanent magnets of the rotor.

Abstract: A brushless motor 5 of the present invention comprises: a rotor magnet 13 having a magnetized circumferential surface 13a comprising an upper circumferential surface 13a1 magnetized with a plurality of magnetic poles and a lower circumferential surface 13a2 magnetized with a plurality of magnetic poles; and a stator 30 having a stator stack 31 at least partially facing the lower circumferential surface 13a2, wherein the upper circumferential surface 13a1 of the rotor magnet 13 has a surface magnetic flux density of substantially the same level from a center of a magnetic pole until a vicinity of an adjacent magnetic pole, and the lower circumferential surface 13a2 of the rotor magnet 13 has a surface magnetic flux density decreasing from a center of a magnetic pole toward an adjacent magnetic pole.

Abstract: The present application relates to an electric machine (1) including a rotor (13) and a stator (11). The stator has a first set of teeth and each tooth in the first set has a first winding (21) The stator also has a second set of teeth and each tooth in the second set has a second winding (41). The first winding (21) has a first winding count and the second winding (41) has a second winding count. The first and second winding counts are different from each other. The electric machine has particular application in cranking an internal combustion engine. The present application also relates to a related control apparatus (50) and a vehicle.

Abstract: A fan motor includes a stationary portion, a rotary portion, and an impeller. The rotary portion is configured to rotate about a center axis with respect to the stationary portion through a bearing mechanism. The impeller is configured to rotate together with the rotary portion. The stationary portion includes an armature including a coil positioned around the center axis, a metal base plate arranged below the armature, and a circuit board located above or below the base plate and provided with a lead wire electrically connected to the outside. The base plate and the lead wire are isolated from each other by a protection member. By installing the protection member between the metal base plate and the lead wire, the lead wire is prevented from making direct contact with the inner peripheral edge of the metal base plate.

Abstract: Conductor terminals of a plurality of conductor wires that constitute a stator winding each extend outward at a first axial end of a stator core, and among the conductor terminals, conductor terminals through which same-phase electric power flows are respectively connected by crossover wires, and circumferential regions that are occupied by the crossover wires are separated from each other in a circumferential direction.

Abstract: A polarity-switching magnetic diode provides a method of gating or “rectifying” N and S polarized flux contained within the closed-loop flux circuit of a magnetic flux element. Gaps separate the opposing magnetic polarities, and strategically placed control coils are disposed to break the magnetic circuit in at least two places upon electrical activation of the device—forming high density flux zones of opposite polarity. Switching the control coil's magnetic flux flow allows for the high density flux zones to alternate N and S polarity.

Abstract: Disclosed is a stator assembly, which includes a stator core having a circular base part, a plurality of teeth radially formed on an outer face of the base part, and a tooth end portion at the end of the teeth, the stator core comprising a first coating layer formed on an entire surface of the base part and the teeth; and a second coating layer formed on a surface of the first coating layer, wherein the entire surface of the base part and the teeth is coated with the first coating layer and the entire surface coated with the first coating layer is coated with the second coating layer, and wherein the first coating layer and the second coating layer are made of insulating powder.

Abstract: Disclosed is an anti-separating structure of a sensing magnet for EPS motor, the structure being a coupling structure between the sensing magnet and a plate of the EPS motor, the structure including a disk-shaped plate formed with a magnet accommodation unit protrusively formed near at a rotation shaft, a ring-shaped sensing magnet centrally formed with a through hole having a diameter corresponding to the magnet accommodation unit, and magnet grip units each formed at a predetermined gap along a circumferential surface of the magnet accommodation unit.

Abstract: Provided is a pump that includes an annular molded stator having a substrate mounted with a Hall element and that includes a rotor having an annular rotor unit rotatably housed in a cup-shaped partition component, with one end thereof in an axial direction facing the Hall element and the other end thereof in the axial direction provided with an impeller attachment unit. The rotor unit includes a resin magnet, a sleeve bearing, and a resin portion. The resin magnet includes a rotor-position detecting magnetic-pole portion protruding axially with a predetermined height in an annular shape having a predetermined width in a radial direction on an outer periphery of an end face opposite to the Hall element. The rotor-position detecting magnetic-pole portion includes a plurality of arc-shaped notches on the same circumference on an inner diameter side thereof.

Abstract: In an electronically commutated DC motor having a stator unit (5) and a rotor unit (1) which is in the form of an external rotor, and having stationary sintered bearings (8, 9), the invention proposes that the rotor unit (1) is conductively connected to the shaft (3) in order to connect a conductive shielding, which is formed on the rotor unit (1), to a defined electrical potential, and that the sintered bearing (8, 9) is conductively connected to the potential, so that the shielding of the rotor unit (1) is capacitively coupled to the potential by means of the electrically insulating, oil-filled bearing gap which is arranged between the shaft (3) and the sintered bearing (8, 9). Therefore, a sliding contact is not required.

Abstract: Disclosed are a hydrodynamic bearing structure for bearing a cooling fan and a method of assembling the same. The hydrodynamic bearing structure comprises a housing, a hydrodynamic bearing, a rotation shaft, a thrust member and a bottom plate. The hydrodynamic bearing is mounted in an accommodating space within the housing. The rotation shaft is disposed through a rotation shaft hole of the hydrodynamic bearing. The thrust member is disposed on an end portion of the rotation shaft and accommodated between a bottom surface of the hydrodynamic bearing and a top surface of the bottom plate. A plurality of guiding grooves are disposed in a surface of the thrust member, so that an oil layer applied with pressure is formed on the surface of the thrust member to maintain stable rotation of the rotation shaft and reduce the deflection and vibration of the fan during rotation.

Abstract: A fluid dynamic bearing motor and method are provided for use with various disc drive memory device products differently rated by operational rotational speed. The operational speeds are those speeds measured during reading and writing memory operations to the memory device. In an aspect, the present invention meets full operating requirements, including stiffness and power requirements, at multiple rated speeds for use with either standard or high-end performance disc drive products. Costs associated with a dedicated manufacturing line for high-end products are substantially reduced. A single manufacturing line can serve both standard and high-end disc drive memory device products. The present invention is especially useful in reducing costs of 2.5 inch notebook products that are typically marketed in two levels of performance, namely, 5400 RPM standard performance products and 7200 RPM high performance products.

Abstract: A permanent magnet motor includes a rotor including a rotor core formed with magnet insertion holes and permanent magnets inserted into the insertion holes. The rotor core includes a plurality of pairs of divided cores. The divided cores of each pair are adjacent to each other, and one divided core of each pair has two ends formed with respective engagement convexities and the other divided core has two ends formed with respective engagement concavities. The permanent magnets included permanent magnets having a lower coercive force and permanent magnets having a higher coercive force. A number of the permanent magnets having the lower coercive force and a number of the permanent magnets having the higher coercive force for each of the divided cores are the same as the other divided cores such that the divided cores have an equal total flux such that the divided cores have an equal total flux.

Abstract: An actuator assembly includes a housing having a central axis, a motor compartment on one end defined about the central axis, a gear compartment on the other end. An electronic rotational position sensor is fixed relative to the housing proximate the motor compartment. A motor assembly is disposed in the motor compartment and has a hollow input shaft extending along the central axis into the gear compartment. An output shaft extends along the central axis and has a lower end extending out of the gear compartment and an upper end extending freely through the hollow input shaft to a point proximate to the electronic rotational position sensor. A gear assembly is supported within the gear compartment for translating rotation of the input shaft to the output shaft. A sensed object is disposed on the upper end of the output shaft opposed to the speed sensor.

Abstract: A rotor type brushless motor comprises a drive magnet having an indexing pole part that extends on one axial side thereof. This indexing pole part is formed at least in the range from the circumferential center of one north pole to the circumferential center of one adjacent south pole, and over no greater than the range from one circumferential end of the one north pole to the other circumferential end of the one south pole. A magnetic flux detector is arranged at a position axially facing the indexing pole part.

Abstract: A motor includes a rotor including a rotor core provided with a plurality of permanent magnets in the circumferential direction and a stator including a stator core on which multi-phase stator coils are wound. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes in the circumferential direction, and the stator has a structure in which first and second stator coils of the stator coils are wound on the stator core for each phase in such a manner that passage of current is optionally switched, and when the passage of current is switched to the second stator coil, the distribution pattern of a magnetic field formed on the inner circumferential side by the stator has uniqueness over the whole circumference.

Abstract: The motor includes: a rotor that includes a rotor core provided with a plurality of permanent magnets in a circumferential direction; and a stator that includes a stator core on which multi-phase stator coils are wound and is arranged facing the rotor with a predetermined air gap therebetween. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes stepwise in the circumferential direction. The stator has a structure in which the distribution pattern of a magnetic field generated by the stator coils with one phase or with a combination of the phases has uniqueness over a whole circumference.

Abstract: A single phase electromagnetic servo-actuator that includes a rotary actuator which moves a mobile member along a limited travel including a 2N ferromagnetic pole stator structure and at least one excitation coil, the stator structure being made of a material with high magnetic permeability and a rotor having ferromagnetic yoke and a thin magnetized portion of 2N pairs of axially magnetized poles, in alternate directions, and a rotor angular position sensor, the thin magnetized portion being a separate element from the ferromagnetic yoke.

Abstract: A variable field magnet rotating electrical machine includes a stator, a rotor, and a rotary position detector. The stator includes a stator winding coil and a stator iron core. The rotor includes a field magnet, a first field magnetic pole portion, and a second field magnetic pole portion. The first field magnetic pole portion is configured to turn relative to the second field magnetic pole portion. The first and second field magnetic pole portions include signal generators each configured to generate a signal to detect a rotary position of a corresponding one of the first and second field magnetic pole portions. The rotary position detector is configured to detect a rotary position of the rotor.

Abstract: A brushless motor stator is provided that may be applied to a plurality of types of motors having different rotational speeds, merely by providing one type of a circuit substrate. A pair of fitting convex portions that project radially outside of a virtual circle centering on a center line C are formed on one insulator divided body of a slot insulator. Three pairs of diagonally located fitting concave portions are formed in an inner circumferential wall portion surrounding a through-hole of a circuit substrate. The pair of fitting convex portions of the one insulator divided body are fitted in one of the three pairs of fitting concave portions. With this, a positional relationship between three hall elements and stator magnetic poles is selected, corresponding to the speed range of a motor to be used.

Abstract: A motor positioning structure is constructed by providing a plurality of positioning pins 28, 29 for positioning a circuit board 22 on a case 21 of a circuit main body 3 and also providing receiving holes 35, 36 for receiving the positioning pins 28, 29 in a frame 4 on the side of a stator in a motor main body 2.

Abstract: A motor rotor system including: an axis of rotation, a rotor iron core mounted on the axis of rotation, a permanent magnet, a magnetic ring bracket, and a magnetic ring. The permanent magnet, the magnetic ring bracket, and the magnetic ring are mounted on the rotor iron core. The magnetic ring is sheathed on the magnetic ring bracket. The magnetic ring bracket is located at one end of the rotor iron core and connected with an end face of the rotor iron core. The motor rotor system has excellent batch-to-batch consistency, simple structure, and convenient installation. It is suitable for large batch production and can be controlled using sine-wave driving control methods with a position sensor.

Abstract: A rotor 14 is rotatably disposed around a stator 13 that is provided with a plurality of magnetic poles 13a. The inner circumferential face of the rotor is provided with a magnet 15 on whose face opposing the stator main magnetization is performed, and on whose face opposing the substrate FG magnetization is performed. The outer circumferential ends of the magnetic poles of the stator are provided with extended portions 13b and 13c that vertically extend from the magnetic pole base 13d. A face of the substrate opposing the rotor is provided with a FG pattern 19 opposing the magnet 15. The FG pattern is disposed on an outer side in a radial direction of the outer circumferential face of the stator.

Abstract: A rotor 14 is rotatably disposed around a stator 13 that is provided with a plurality of magnetic poles 13a. The inner circumferential face of a rotor frame 14b of the rotor is provided with a magnet 15 magnetized to have alternately opposite polarities in a direction opposing the stator, and magnetized to have alternately opposite polarities in a direction opposing a substrate. The outer circumferential ends of the magnetic poles of the stator are provided with a first extended portion 13c that extends from a magnetic pole base 13d to a substrate 11 side, and a second extended portion 13b that extends from the magnetic pole base to a side opposite the substrate side. A face of the substrate opposing the rotor is provided with a FG pattern 19.

Abstract: The object of the invention is a rotor for a permanent-magnet synchronous machine in which a pole structure is fitted onto the surface of the rotor body structure facing the air gap. Each of the rotor's pole structures comprises at least one permanent magnet and a shell structure fitted on top of it. According to the invention, an intermediate layer made of magnetic composite is fitted between the permanent magnet and the shell structure.

Abstract: The motor of the invention is an outer rotor type motor, and a rotor includes a cylindrical rotor frame that is opened at one end thereof in an axial direction, and a hollow cylindrical magnet attached to an inner periphery of the rotor frame. The magnet has a joining portion joined to an inside cylindrical portion of the rotor frame, and a protruding portion that further protrudes in the axial direction from one end, the outer diameter of the protruding portion is larger than the inner diameter of the rotor frame, and the joining portion is directly brought into close contact with a portion ranging from the one end to at least a portion of the inside cylindrical portion.

Abstract: An integrated electric motor and controller assembly includes a motor, a controller mounted to the motor, and a sensor device disposed at an interface between the motor and the controller. The sensor device includes a sensor disposed at the controller and a magnet disposed at the motor. An alignment structure is provided at the interface between the motor and the controller for positioning the sensor relative to the magnet when the controller is mounted to the motor. The magnet is recessed in the motor and the sensor is protected by a controller housing of the controller. This arrangement has the advantages of protecting the sensor device from damage during shipment and assembly and providing a quick assembly and connection of the sensor device to the motor and the controller.

Abstract: An electric motor has a stator (12) as well as a rotor (14) rotatable about a rotation axis (85) and a sensor magnet (82) having an even number of sensor poles (71, 72, 73, 74). The sensor magnet (82) is configured to generate a magnetic flux having a magnetic flux density that changes sinusoidally with respect to the rotation angle. Two analog rotor position sensors (460, 465) are arranged on a support structure (468) at a distance from one another such that, during operation, they generate two sinusoidal signals (B_S1, B_S2) having a phase shift of 90° to each other. A signal generator (90) serves to generate at least one pulse-shaped signal (A, B) from the two sinusoidal rotor position signals (B_S1, B_S2) that are phase-shifted by 90°. The instantaneous rotation speed can be accurately determined from this pulse-shaped signal.

Abstract: An electric motor includes a rotor having a field permanent magnet, a board housing member fixed to a stator, and a magnetism detecting circuit that detects the magnetism of the field permanent magnet. The magnetism detecting circuit includes a circuit board that is discrete from the board housing member, a sensor case that is discrete from the circuit board and is supported on the circuit board, and a rotation sensor held by the sensor case. The board housing member has an engagement hole and a positioning surface. The sensor case has an engagement convexity corresponding to the engagement hole and an abutting surface corresponding to the positioning surface. When the circuit board has been located in the board housing member, the engagement convexity engages the engagement hole and the abutting surface abuts the positioning surface, resulting in that the rotation sensor is positioned relative to the board housing member.

Abstract: An electric motor has a stator (224) having a bearing tube (238) made of a magnetically transparent material; it also has a rotor (222) having a rotor shaft (234) that is at least partially journaled in the bearing tube (238), and has a ring magnet (250) that is fixedly arranged on the rotor shaft (234) inside the bearing tube (238). Two magnetic-field-dependent analog sensors (248?, 248?) are arranged on a circuit board (246) outside the bearing tube (238), at an angular distance (PHI) from one another, in order to generate rotor position signals as a function of the rotational position of the ring magnet (250). A corresponding device (150) that serves to control the motor is provided, in order to process these rotor position signals into a signal that indicates the absolute rotational position of the rotor (222).

Abstract: A magnet embedded motor includes a rotor, a plurality of magnets embedded in the rotor, and a yoke provided with the plurality of magnets for forming a magnetic path. The rotor is formed with the plurality of magnets and the yoke in a single member by means of a resin molding by making the plurality of magnet and the yoke as an insertion body.