Abstract: The present invention provides a molded motor in which the axial center of an inserted body can easily be aligned with the axial center of the rotor of the mold motor.The molded motor of the present invention is provided with: a stator 30 having a stator core 31 laminated from a plurality of layers of thin metal coldrolled steel plate and stator coils 8 mounted in the stator core 30; a rotor 2 rotatably disposed inside the stator 30; and a molded main body 4 made of resin which covers the stator 30 and has a receiving portion 17 in which an annulus 16 is received, wherein guide portions 34 are formed in the cold-rolled steel plate closest to the annulus 16 to align the axial center of the annulus 16 with the axial center of the rotor 2.

Abstract: A miniature motor with a two-pole stator, and a rotor having three or more salient poles each having a core with flanges extending toward both sides thereof and a winding. The rotor is adapted to simulate a two-pole construction by cutting off at least the tip of a flange on either side on a part or all the salient rotor pole cores, thereby limiting the spontaneous-stop angular positions of the rotor to two. One insulating spacer is provided between a plurality of commutator segments of the commutator in such a positional relationship as to come in contact with one of the two brushes when the rotor is at a spontaneous-stop angular position. The motor is prevented from burning and restarting suddenly after a stop since the motor has a self-inactivating function by interrupting current supply at spontaneous-stop angular positions while maintaining motor torque by minimizing the angle of non-conduction to the rotor.

Abstract: A two-phase electro-mechanical stepper motor having 1) a high ratio of torque per mass and torque per power draw, to be able to develop required rotating torque, 2) a magnetic circuit that allows developing of a significant holding torque while using a limited amount of electric power, and 3) two disk rotors positioned on either side of the stator with aligned poles. The actuator has a shaft extending into the actuator, and a first and second rotor, each fixedly mounted on the shaft, and each having a permanent magnet mounted thereon in opposing fashion. Additionally, there is a stator, loosely mounted around the shaft and positioned between the opposing permanent magnets, and having at least a first and second pole extending toward the first and second rotors respectively.

Abstract: A spindle-drive motor, especially for driving a hard drive, with a stator, a rotor, an axle between them having at least one bearing, and a drive, where the rotor or stator is provided with a bushing which accommodates at least one bearing. The bushing and bearing together form a sealing gap which seals the rotor and the stator with respect to each other.

Abstract: A vehicle alternator is provided with a metal plate 133a to allow a resin fan 133 to be secured to an end surface of a polar core by welding. The metal plate may comprise an flat annular plate insertion molded into the resin fan, or disks disposed in a circle concentric to the resin fan, which is insertion molded into the resin fan an annular flange portion 343b which clamps the resin fan to the polar core and a cylindrical portion 343a may be provided, or a flange portion 443b and a cylindrical portion 443a may be provided. An annular flange portion 543b which clamps the resin fan to the polar core and a hollow cylindrical portion 543a and a flat annular plate portion 543d which extends radially inwards therefrom may be provided.

Abstract: A magnetic bearing (10) is provided for supporting a rotor (12) for rotation about an axis (14). The magnetic bearing (10) includes a plurality of actuator cores (16) spaced circumferentially about the axis (14), and a plurality of non-magnetic spacers (18A, 18B). Each of the cores (16) has a pair of circumferentially spaced end surfaces (28). Each of the spacers (18A, 18B) is positioned between the end surfaces (28) of adjacent pairs of the cores (16) and has an interference fit with the end surfaces (28) to form a circumferentially preloaded ring (19) of the cores (16) and spacers (18A, 18B) centered on the axis (14). At least one of the non-magnetic spacers is a multi-piece assembly (18A) including a shim (32, 49) having a width selected to provide the circumferential preload within a predetermined range.

Abstract: Disclosed is an insulated bobbin for stator which has good insertability of a stator iron core with no reduction of coil winding space.A first bobbin and a second bobbin each comprise a bobbin inner rim wall, provided along an outer rim face of an iron core main body, and a projections projecting from the bobbin inner rim wall in the diameter direction in correspondence with a plurality of projecting poles, each projection being U-shaped in cross-section with an opening on the division side, and a pair of side walls of the projections being of different height in the central axial direction so that a step is created by their edges.

Abstract: In a permanent magnet rotor type electric motor having a stator core generating a rotation magnetic field and provided therein with a rotor core in which each magnetic pole is formed by a permanent magnet, the rotor core is fabricated by coaxially and unitedly joining a first core member and a second core member, in which a first permanent magnet of a predetermined cross-section shape is embedded per magnetic pole in the first core member, and a second permanent magnet which is made of a different material and has a different cross-section shape from those of the first permanent magnet is embedded per magnetic pole in the second core member, thereby achieving the permanent magnet rotor type electric motor having the performance and size appropriate for the intended use.

Abstract: To facilitate manufacture of casings of a stepping motor and simultaneously to enhance the performance thereof, a rotor (5) is mounted on a rotary shaft (1), the rotor (5) is supported to the casings (6) and (7) by pressing a metal plate, a bush (13) made of non-magnetic material is retained to at least one of the casings (6) and (7), and an inner circumferential portion of a stator core (10) provided between the casings (6) and (7) is supported by the bush (13). Since a gap between the outer circumferential portion of the rotor (5) and the inner circumferential portion of the stator core (10) may be kept constant by the bush (13), a performance of rotation is enhanced, and since the bush is made of non-magnetic material, magnetism generated in the stator core (10) does not leak to the casings (6) and (7).

Abstract: An electric motor assembly includes an output shaft with a fixed large gear, a driving shaft with a fixed small gear, a motor for rotating the driving shaft, and a gear box. The gear box includes a housing and a reduction gearing, which is disposed within the housing. The gearing includes a plurality of speed-reducing members, each of which includes a rotating shaft journalled in the housing, a large gear sleeved fixedly on the rotating shaft, and a small gear sleeved fixedly on the rotating shaft and with a tooth number and a diameter that are smaller than those of the large gear. The large gears of the output shaft and the speed-reducing members mesh respectively with the small gears of the driving shaft and the speed-reducing members. One of the large and small gears of the speed-reducing members has a side surface.