Abstract: A stepping motor which includes: exciting coils; a rotor provided with a plurality of N/S poles so as to rotate following a change of an excitation state of the exciting coils; and a detecting coil provided separately from the exciting coils so as to generate induction voltage according to rotation of the rotor.

Abstract: The present invention provides a linear motor, which can improve motor efficiency and which can be manufactured by a simplified procedure. The linear motor of the present invention includes a movable unit of cylindrical shape and having the central axis at the intersection of the X-axis and the Y-axis. An inner yoke is arranged on an inner side of the movable unit with a given spacing in the radial direction of the movable unit and is formed by laminating a multiple of thin plates each in approximately rectangular in shape and having strong magnetic permeability arranged in the direction of the X-axis. An outer yoke is arranged on the outer side of the movable unit with a given spacing in a radial direction of the movable unit and is formed by laminating a multiple of thin plates, each approximately rectangularly shaped and arranged in the same direction as the thin plates of the inner yoke. A pair of permanent magnets are magnetized in a direction from the inner yoke to the outer yoke.

Abstract: A linear direct current motor comprises a center yoke (1) ending in the longitudinal direction X, an outer yoke (31) arranged parallel to the center yoke, a peat magnet (41) for generating magnetic field between the outer yoke and the center yoke, and a coil assembly (10) that is movable in the longitudinal direction X having an opening through which the center yoke passes. This coil assembly includes a flat cooling pipe (7) having a cross section elongated in the longitudinal direction and a U-shaped fold for passing the center yoke through, a manifold (9) having a cooling medium inlet (9A) and a cooling medium outlet (9B) and being connected to both ends of the cooling pipe, and a coil (5) wound around the cooling pipe and the manifold.

Abstract: A rotor for an electric motor includes a frame previously formed and fixed to a rotational shaft of the motor so as to be rotated with the rotational shaft, and a magnet molded from a molten magnetic resin so as to be disposed at a stator side of the frame and so as to be integrated with the frame.

Abstract: A magnet machine includes a magnet rotor. The rotor includes a sleeve and a magnet. The magnet is positioned within the sleeve. A highly electrically conductive, nonmagnetic shield surrounds the magnet. The shield reduces rotor eddy current losses and lowers rotor operating temperature, thereby improving efficiency of the machine.

Abstract: A vehicle AC generator comprises a metal bush (43) having a bushing part (43a) loosely fitted onto an output terminal bolt (26) and a fixed part (43b) fixed to the output terminal bolt (26) on the opposite side of a vehicle side connecting terminal (42) of the bushing part (43a), wherein a fastening nut (44) is screwed onto a screw part (26b) on the take-out end part side of the output terminal bolt (26) so that the vehicle side connecting terminal (42) is held between the bushing part (43a) and the fastening nut (44).

Abstract: In a turbo generator with a rotor with direct gas cooling, which rotor is provided with a rotor winding arranged around a central rotor body, said rotor winding being on the front sides covered by one each annular cap plate, and in which rotor cold cooling gas for cooling the rotor flows into ring gap segments between the cap plate and the rotor body, whereby the ring gap segments are bordered, when seen in circumferential direction, on the sides in each case by the section of an end spacer plate provided between the cap plate and the rotor winding, whereby this section is projecting into the ring gap, improved cooling is achieved in that separations of the cooling gas stream on flowing into the ring gap segments are avoided by designing the sections of the end spacer plates, whereby these sections adjoin the ring gap, in a manner that is advantageous with respect to the flow.

Abstract: A wiper motor has brushes slidable in contact with a commutator, choke coils connected in series with the brushes, and a circuit breaker for preventing burn-out caused by excessively high current. The circuit breaker is disposed in the vicinity of the choke coils and operates based on heat generated by the choke coils.

Abstract: A wind or ocean turbine has an input-power shaft-mounted, rotating bull-gear with smaller stationary pinion-driven powertrains including generators mounted around the periphery of the bull-gear. A controller regulates torque experienced by each powertrain to balance torque between generators at any system load. Regulation includes controlling local voltage at each generator by a transformer configured as a reactor. Coils of the transformers are wired in parallel and actively modulated with an SOR, solid-state, switching device. Each generator output is connected to a respective primary coil of a transformer and a respective secondary coil is connected to an SCR. By using pulse width modulation, the SCR is gated on and off for a portion of a 60 Hz cycle. By adjusting the duty cycle of SCR gating, any voltage between 80% and 100% is attained to satisfy immediate torque requirements.

Abstract: A linear motor includes tubular outer yoke (4), tubular inner yoke (3) disposed in outer yoke (4), coil (2) provided to inner yoke (3), permanent magnet (5a, 5b) vibrating following a magnetic flux produced by coil (2), and vibrator (6) made of magnetic material and supporting permanent magnets (5a, 5b). Magnetic loop produced by outer yoke (4) and inner yoke (3) travels through vibrator (6) free from interference by vibrator (6) because vibrator (6) is made of magnetic material. As a result, the linear motor vibrates efficiently.

Abstract: In accordance with the present invention, a system controller and method for monitoring and controlling a plurality of generator sets are provided. Each generator set generates electrical power and includes a generator communications link for connecting a generator set to a network. A user interface allows a user to select a generator set and set values for various predetermined operating parameters of the selected generator sets. Thereafter, a communications link connectable to the network transmits the user set values of the predetermined operating parameters to the selected generator set.

Abstract: A stator (10′) for a power generator having a coil support finger plate (20′) and associated methods are provided. The stator (10′) preferably has a plurality of laminations or step irons having a plurality of spaced-apart stator coil slots (30′) formed therein and stator coil slot contents (40) positioned in each of the plurality of stator coil slots (30′). The stator coil slot contents (40) preferably include at least one stator coil (43). The stator (10′) also preferably has a coil support finger plate (20′) positioned at an end portion of the plurality of stator coil slots (30′). The coil support finger plate (20′) has a base (21′) and a plurality of fingers (26, 27) extending outwardly from the base (21′) between the plurality of spaced-apart stator coil slots (30′).

Abstract: A high-density stator core for use in electrodynamic devices is fabricated by the electromagnetic pressing of an iron-based powder coated with a dielectric material and methods for performing the electromagnetic pressing are disclosed. The stator core includes a yoke portion that may further include a plurality of integral poles extending either radially outward from an outer circumferential surface of the yoke portion or radially inward from an interior circumferential surface of the yoke portion. The stator core is formed as a near-net-shape compact by an electromagnetic pressing process and has an as-formed density of at least about 98% of the theoretical density.

Abstract: A spindle motor having a pivot which tip portion can easily be formed by a spherical surface having high precision, high hardness, the diameter of which can be determined as desired, the tip portion 6a of the pivot 6 is formed by cutting a steel ball used in a bearing or the like having any diameter. The pivot 6 having a spherical surface 6a is formed by fixing the pivot tip portion 6a to one side surface 6c of a substantially cylindrical shaft portion 6b. As a result, the spherical surface having a high precision, high hardness which diameter can be determined as desired can easily be formed at the tip portion 6a of the pivot 6.

Abstract: An electric motor operated by AC current, that includes a stator and a rotor supported for rotation about an axis relative to the stator. The stator is provided with field windings angularly distributed about the rotor axis and capable of producing a magnetic field vector in the space of the rotor. Circuitry delivers AC current to the windings in a manner that produces an AC magnetic field vector that moves around the axis of the rotor. The rotor has a construction, such as an axially extending conductive loop, that changes its reluctance in the AC magnetic field depending on its orientation to the AC magnetic field vector whereby the rotor is caused to rotate in synchronization with the movement of the AC magnetic field vector.

Abstract: In an electric-motor drive device for auxiliary devices in motor vehicles, such as sliding roofs, window controls, windshield wipers, and the like, having a gear housing (17) and a cup-shaped motor housing (13) that is slipped with its opening edge (131) onto the gear housing (17) and fixed thereon, to reduce manufacturing costs and the requisite installation space and improve force introduction from the motor housing (13) to the gear housing (17), the motor housing (13), in its slip-on region, is roller-burnished into the gear housing (17).

Abstract: This invention relates to an arrangement for detecting the driven state of a vibration wave actuator apparatus and provides an apparatus in which a waveform signal having an amplitude corresponding to a vibration state is generated by a monitor circuit, and this waveform signal is level-detected by a comparing circuit having a predetermined threshold so as to form a signal having a pulse width corresponding to the amplitude of the waveform signal, thereby detecting a vibration state from the pulse width.

Abstract: A magnetic levitation motor has a rotator body formed from a magnetic member and having segmented permanent magnets attached to a peripheral surface thereof. Two magnetic levitation motor sections are disposed in an axial direction of the rotator body. Each of the magnetic levitation motor sections having a first stator winding that generates a levitation control magnetic flux for levitating the rotator body and a second stator winding that generates a rotation magnetic flux for rotating the rotator body. The segmented permanent magnets are affixed to the rotator body at the two magnetic levitation motor sections with magnetic polarities thereof mutually opposite to each other. The segmented permanent magnets function as bias magnets that generate a direct-current magnetic flux that radially spreads from within the rotor.

Abstract: An axial gap motor-generator of the type coupled to a shaft having an axis of rotation. The motor-generator comprises a rotor having a rotor body rotatably disposed about the shaft and having an outer region. The rotor includes a plurality of openings disposed in the outer region and spaced from one another. Each of the openings includes an outer edge. The motor-generator also includes a plurality of magnets equal in number to the openings. Each of the magnets includes an outer edge corresponding to the outer edge of a corresponding one of the openings. The outer edge of the magnets generally is non-conformal to and is slightly smaller than the outer edge of the openings, and each of the magnets is shaped to be inserted into the corresponding one of the openings. The motor-generator further includes a stator assembly positioned adjacent to the rotor. The stator assembly includes windings positioned to be adjacent to the magnets when the rotor is rotated.

Abstract: A permanent magnet motor having a stator and a permanent magnet rotor facing the stator with a gap therebetween, the stator having a plurality of stator magnetic poles extending radially toward a peripheral surface of the rotor, s number of small stator teeth formed on a tip end of each of the magnetic poles, and exciting windings of m phases wound around the stator magnetic poles. The rotor having a cylindrical permanent magnet having pieces of N pole and pieces of S pole arranged alternately in a peripheral direction thereof at equal pitches, wherein a pitch of the small stator teeth is 1±1/(2ms) times larger than a pitch of the rotor magnetic pole pairs. The width of the small stator tooth is 37˜47% of the magnetic pole pitch. A depth of the groove formed between the adjacent small stator teeth is more than 15 times larger than the length of the air gap between the stator and the rotor.