Abstract: A rotary electric motor in which rotor and stator members are each configured as annular rings, concentric with respect to each other, about an axis of rotation. Either of the rotor or stator members is formed of groups of electromagnet poles, the groups substantially equidistantly distributed along the angular extent of the annular ring, each of the groups comprising magnetic material magnetically isolated and separated from the other groups. The other member comprises a plurality of permanent magnet poles substantially equidistantly distributed with alternating magnetic polarity along the angular extent of the radial air gap formed between the members, the permanent magnet poles having a common magnetic return path.

Abstract: A brush assembly (10) for a miniature electric motor has a beryllium copper strip brush arm (14) and a graphite material brush head (12) moulded to an end thereof. The brush arm (14) has a number of apertures. The brush head (12) has a number of projections which pass through the apertures and form one or more caps (24) on the reverse side of the brush arm to secure the brush head (12) to the brush arm (14). A method of forming the brush assembly is also provided.

Abstract: A disc drive design comprising a shaft and sleeve supported for relative rotation by a journal type fluid dynamic bearing utilizing grooves on one of the shaft or sleeve surfaces. At least a part of the shaft is generally conical in cross-section, so that a downward force component is developed to balance upward pressure on end of shaft; this conical region typically includes a fluid dynamic bearing (grooves being on either the shaft or sleeve). A grooved pattern of a design similar to that usually found on a thrust plate may be defined on an axial end surface of the shaft or the counterplate facing the axial end of the shaft, so that thrust is created to maintain separation of the end of the shaft and the facing counterplate plate during relative rotation. A diamond-like coating (DLC) may be applied to the counterplate surface or to the end of the shaft; further, either the counterplate or shaft may be made out of ceramic material to enhance this performance.

Abstract: An actuator coil with a race track winding that generates a magnetic field. A cooling tube has cooling liquid flowing therethrough and is wrapped around a periphery of said race track winding. A plurality of thermal conductive strips are arranged generally transverse to at least portions of said race track winding so as to conduct heat from said racetrack winding to said cooling tube.

Abstract: An electric rotating machine including a casing, two disk-shaped rotors arranged in concentric relation to each other within the casing, and a stator disposed concentrically with the rotors within the casing. The rotors include magnets, respectively. The magnet of one of the rotors and the magnet of the other of the rotors are disposed radially offset from each other. The stator includes a radially outer portion axially opposed to the magnet of one of the rotors and a radially inner portion axially opposed to the magnet of the other of the rotors.

Abstract: An improved cooling arrangement for an electric motor in a pump assembly, including a resilient fan baffle having a planar main surface and a pair of wings extending perpendicularly out from the main surface to direct airflow away from the motor when the fan baffle is installed on the motor. A method of installing the fan baffle includes bending two ends of the periphery of the fan baffle to clear obstructions on the motor, and then releasing the ends to allow them to come together in a planar arrangement.

Abstract: A cooling structure and a rotating electric machine with the cooling structure are provided. The cooling structure produces sufficient reductions in the temperature of the stator core while at the same time not causing a large reduction in the output of the rotating electric machine. The rotating electric machine is provided with a first cooling medium passage formed in the slot. In addition, a second cooling medium passage is provided which extends in parallel to the first cooling medium passage and allows flow of the same cooling medium as the first cooling medium passage. The stator core comprises at least a section of the passage wall of the second cooling medium passage. The second cooling medium passage is disposed so that the second cooling medium passage does not impede the flow of magnetic flux in the stator core.

Abstract: The machine included a rotor which is rotatably arranged about an axis of rotation with a superconducting winding in a winding carrier. In order to hold the winding carrier inside the outer housing of the rotor, a fixing device which extends axially on one-side is provided on the torque-transmitting side of the rotor. The fixing device can be at least partially made of a fiber-reinforced plastic.

Abstract: An electric motor having a stator arranged on a sleeve; and a rotor assembly having a rotor shaft and at least one permanent magnet arranged on the rotor shaft, the rotor shaft being rotatbly housed in the sleeve. An external dimension of the rotor assembly and an internal dimension of the stator are selected such that the rotor assembly is free to move in the axial direction while the rotor assembly is inserted into the stator. The rotor assembly is aligned within the stator in the magnetic center of the stator by self-centering magnetic forces.

Abstract: A permanent magnet embedded type concentrated winding motor generator, wherein of the mechanically and electrically independent first and second winding groups (4, 5), the plurality of first teeth (2) wound with the first winding groups (4) are divided into three groups (I, II, III) for example, and the winding directions of the windings of adjacent first teeth (2) within the same group (I, II, III) are opposite. Furthermore, one second tooth (3) wound with a second winding group (5) with a different winding specification from the first winding groups (4) is provided between each of the groups (I, II, III).

Abstract: A spherical motor (10) that includes an outer field sphere (12) and an inner armature sphere (14) rotatable therein. Field magnetic elements (26) are disposed on the field sphere (12) and sensor/actuator magnetic elements (42) are disposed on the armature sphere (14). The field magnetic elements (26) include two coils (28, 30) providing regularly varying magnetic fields in two axes. The sensor/actuator magnetic elements (42) include coils (44-54) providing magnetic fields in three axes. Each sensor magnetic element (42) senses its localized magnetic field variations and generates a torque relative thereto. Over one complete field variation of the field magnetic elements (26), each sensor magnetic element (42) can produce torque about all three axes.

Abstract: A brushless DC permanent magnet motor having a step skewed rotor including a rotor shaft having a portion having a substantially uniform cross sectional configuration defined by N planar sides of substantially equal length and width wherein N is equal to the number of poles of the motor, first and second annular sets of N number of substantially identically shaped bread loaf magnets one of which is attached to each of the N planar sides of the rotor shaft wherein the magnets of the first set have their orientation reversed with respect to the magnets of the second set and the magnets of the first set are offset or skewed by a predetermined skew angle from the magnets of the second set of magnets to form a stepped skewed rotor.

Abstract: A motor has twenty-four segments and a commutator. Each of eight short-circuit members short-circuits three of the segments with one another. Each short-circuit member includes an annular base portion and three arms radially extending from the base portion. Each arm is connected to one of the three segments to be short-circuited. Each arm has a segment connection portion at the distal end. The segment connection portion is connected to the corresponding segment. The base portions are laminated in the axial direction of the commutator such that the short-circuit members form a laminated body. The arms are formed such that all the segment connection portions are located in the same position with respect to the axial direction of the laminated body. As a result, the manufacture of the motor is facilitated.

Abstract: Disclosed herein is a kinetic pressure bearing motor, which is provided with an auxiliary dynamic pressure generating means, thus allowing a motor shaft to be stably rotated at a high speed, and considerably reducing vibration, therefore enhancing the performance of the motor. The kinetic pressure bearing motor includes a support unit which is provided at an outer surface of a motor shaft, and a shaft holder which is fitted over an upper portion of the motor shaft. Further, grooves for generating dynamic pressure are formed on an outer surface of the support unit. An extension is provided at the shaft holder to support the support unit in such a way as to be in contact with the outer surface of the support unit having the grooves.

Abstract: An electric motor includes: a stator having a plurality of first coils with a rotor receiving part formed inside thereof and generating a rotating magnetic field and a plurality of second coils making a pair with the first coils and generating an induction magnetic field induced by the magnetic field of the first coils; a first rotor formed as a hollow permanent magnet, installed in the rotor receiving part and rotated by the magnetic field formed in the first coils and the second coils of the stator; and a second rotor having a rotational shaft fixedly installed at a center of the second rotor, and being installed inside the first rotor so as to be rotated by rotation of the first rotor.

Abstract: A flywheel magneto generator which comprises a rotor having a magnet attached to an outer circumferential side of a flywheel and a stator constructed by winding a generating coil around a core having a magnetic pole portion opposed to a magnetic pole of the rotor, wherein a through hole is formed in a peripheral wall portion of the flywheel, a yoke plate is provided so as to block one end of the through hole which is opened on an inner circumferential side of a peripheral wall portion of the flywheel, the magnet to which a magnet cover is attached is supported on the yoke plate, and one magnetic pole face of the magnet is opposed to the yoke plate.

Abstract: A magneto-generator, a method of manufacturing the same and a resin molding die for manufacturing the same. In the magneto-generator, a guard ring is omitted with the performance of the magneto-generator being enhanced. The magneto-generator is manufactured by making use of a resin molding die (21) having an outer peripheral surface (21d) to be positioned in opposition to an inner peripheral surface of a flywheel (11) and projections (21a) provided in the outer peripheral surface (21d) for holding a plurality of magnets (12) at predetermined positions, respectively. The magnets (12) are positioned and held stationarily at predetermined positions by the aforementioned projections, respectively, and spaces defined between the resin molding die (21) and the inner peripheral surface of the flywheel (11) are filled with a resin. After hardening of the resin, the resin molding die (21) is detached from the flywheel (11).

Abstract: A rotor conductor upper portion positioned near to an outer periphery of a rotor has a trapezoidal, cross sectional shape, a rotor conductor lower portion positioned nearer to a center of the rotor than the rotor conductor upper portion has a rectangular, cross sectional shape, and the rotor conductor upper portion has a height h1=27 mm or more in the case where rotor conductors are made of brass, and a height h1=7 mm or more in the case where the rotor conductors are made of copper.

Abstract: A positioner has a first surface with a plurality of controlled electromagnets and a second surface having a circular cross-section movably positioned relative to the first surface. A plurality of magnetic positioners are disposed around the second surface. Control logic energizes a sequence of the controlled electromagnets to create magnetic interaction with the plurality of magnetic positioner and thereby move the second surface relative to the first surface. A rotor may be positioned to rotate relative to the second surface. Electromagnetic pickups in proximity with the rotor receive a time-varying electromagnetic field from rotor magnets as the rotor rotates, thereby generating electrical energy.

Abstract: An actuating device, specifically for actuating locking differentials on vehicles, having an actuating shaft, a drive unit to drive the actuating shaft, where the drive unit comprises an armature core mounted to the actuating shaft so as not to rotate, and a commutator mounted to the actuating shaft so as not to rotate and/or with an electromagnetic brake unit to slow and/or stop the actuating shaft, where the brake unit includes a brake hub flange mounted on the armature so as not to rotate and having a single- or multi-piece housing tightly enclosing the drive unit and the brake unit, where the free end of the actuating shaft extends from the housing and with a sensor to measure the angle of rotation of the shaft, where the sensor unit includes at least one trigger wheel indirectly coupled to the shaft and at least one sensor scanning the trigger wheel position and coupled indirectly to the housing.