Abstract: A spindle motor adapted to be loaded with a disk provided with an attracted plate and to rotate the disk is provided which comprises a turn table having a flange portion on a front surface of which the disk is to be mounted and on a back surface of which a rotor yoke is supported, and a cylindrical portion a distal end of which is to be opposed to the attracted plate, the turn table being supported on a housing of a stator through a rotational shaft; an attraction magnet fixed to the distal end of the cylindrical portion of the turn table, and an aligning member an inner periphery of which is engaged with an outer periphery of the cylindrical portion and an outer periphery of which is to be brought into contact with an inner periphery of a center hole of the disk to align the disk; and an urging member interposed between the aligning member and the flange portion of the turn table to urge the aligning member by restoration force, wherein the urging member is comprised of an annular spring material with a plur

Abstract: An inexpensive, small, high-efficiency actuator having a single-phase claw pole structure permits easy assembly or winding and enables a rotor to act in a fixed direction by detent torque even in a deenergization mode.

Abstract: An electromagnetic machine includes a rotor having a plurality of poles and a stator also having a plurality of poles. The poles for the rotor are divided into a first and second set of radially opposed pairs. The first set has uniform faced poles. The second set has a notched face. The stator includes radially opposed pairs of poles having uniform faced poles. The rotor and stator are disposed for movement relative to each other such that the first and second sets of poles for the rotor are movable in relation to the radially opposed pairs of the stator. The electrical interaction between uniform faced poles of the rotor with uniform faced poles of the stator produces a first normal force profile. The electrical interaction between notched faced poles of the rotor with uniform faced poles of the stator produces a second normal force profile. The first and second normal forces act dynamically in time or position on the stator as the rotor moves in relation to the stator.

Abstract: Disclosed is a permanent magnet generator incorporated in a 3.5″ diskette that can be used as an input/output adapter for memory cards that can generate a power generation output of 40 mW or more when the rotor of the generator is rotated at 300 rpm. The permanent magnet generator has such a construction that rotor magnetic poles are provided only on one end face of a disc-shaped permanent magnet serving as a rotor, a plurality of stator magnetic poles are provided only on that end face of the permanent magnet in such a manner as to face the rotor magnetic poles, and a soft magnetic hub is fixedly fitted to the other end face of the permanent magnet. Even when a bonded NdFeB magnet is used as the permanent magnet, a sufficient power can be produced.

Abstract: An electromotive device includes an outer casing, a shaft supported by the outer casing, a bobbin disposed inside the outer casing so as to be disposed around the shaft on a common axis with the shaft, and a coil embedded in an outer molding, the coil being constructed by winding a conducting wire onto the bobbin, the bobbin and the outer molding being composed of an epoxy resin, which is an electrically-insulating material resistant to permeation by sulfur compounds.

Abstract: A rotor for a flywheel magneto generator comprising a flywheel having a reluctor of projection provided on an outer face of a peripheral wall portion of the flywheel and a hole provided in a bottom wall portion of the flywheel at a position close to the reluctor for correcting static unbalance of the flywheel caused by a presence of the reluctor, the flywheel further comprising at least one recess provided in the peripheral wall portion of the flywheel on an end face thereof on the opening side of said peripheral wall portion for getting dynamic balance of the flywheel.

Abstract: A motor has plural through-holes punched in a top surface of its frame. A cap made of magnetic material is placed at a location on a stator which corresponds to the through-holes, and the cap is spaced axially from the through holes. An attracting magnet is placed outside the cap. This structure allows a bearing to hold its oil, and generates attracting force in an axial direction without adversely affecting driving-magnetic-circuits. As a result, an apparatus using this motor can be low in profile and run at a high speed.

Abstract: In a hybrid drive device which drives an electrical motor with electrical power from a storage device and/or from a generator driven by an engine, a secondary battery is generally used as the storage device. However, the storage device must be replaced at fixed intervals due to a short battery life. In addition, the low charging/discharging efficiency of a secondary battery limits improvements in fuel economy of the drive device. The present invention avoids these shortcomings by providing a storage device that includes a condenser bank with a plurality of condenser cells connected in series, parallel monitors which are connected in parallel to each condenser cell and which bypasses the charging current when the respective terminal voltages exceed a fixed value, and a switching converter with fixed current output characteristics which controls the charging electrical power to the condenser bank.

Abstract: A pneumatically driven electric power generator includes a cylinder having one end connected to an air supply passage for receiving pressurized air and a piston having an associated magnetic moment. A portion of the piston is free to move into and out of the open end of the cylinder. An O-ring prevents airflow between the piston and the cylinder when a portion of the piston is located within the cylinder. A spring forces the piston from a position outside of the cylinder to a position inside the cylinder, so that the piston oscillates, moving into and out of the cylinder, driven by air supplied through the air supply passage. One or more electric coils are placed to enclose changing magnetic flux caused by the magnetic moment associated with the oscillating piston whereby an emf is generated in the coil(s) so that an external circuit connected to the coil(s) to complete a circuit through the coil(s) may receive electric power from the coil(s).

Abstract: A rotor for an automotive alternator comprises a cylindrical bobbin fitted over the base portions of a pair of field cores having a cylindrical portion and a pair of first and second annular flange portions projecting perpendicularly from both ends of the cylindrical portion, and a field winding wound a predetermined number of turns into multiple layers on the cylindrical portion of the bobbin, wherein the field winding has a flat shape in which a pair of opposite flat surfaces are parallel, the field winding being wound onto the cylindrical portion of the bobbin such that the pair of opposite flat surfaces face the inner circumferential side and the outer circumferential side, respectively, relative to the radial direction.

Abstract: An alternator for vehicles, provided with a stator, a rotor, a rectifier and a voltage regulator, and comprising turbulent flow generating members 22 provided on heat transfer surfaces, through which heat generated from a field coil is transferred to a side of a bracket from a rotor, to generate convection of an air and turbulence of flow on downstream regions of recesses and projections, whereby a heat transfer performance from the rotor to the bracket is enhanced with a rotational frequency of the rotor.

Abstract: The invention relates to a motor-driven pump unit, in particular for antilock systems of motor vehicles, with an electric motor that is arranged on one side of a pump unit and an electronic unit that is arranged on another side of the pump unit and fastened thereto. The main aspect of the invention is that means are provided for an axially movable attachment and contacting of carbon brushes in connection with an axial installation of the unit. In this way, the individual components of the unit can be assembled axially in a simple manner and at low cost. In addition, the unit requires very little space.

Abstract: A spindle motor incorporates a hollow shaft and a prewound stator having an interconnect ring attached to one end of the stator assembly. The interconnect ring is preferably a printed circuit or flexible printed circuit; it is bonded to the stator stack before the coils are wound, and the start and finish of each phase winding is terminated to the interconnect ring. Once the stator is assembled onto the shaft, connector wires can be fed up through the shaft and terminated at the interconnect ring. Traces on the interconnect ring join the wires to the proper phases and to the commons to control motor operation.

Abstract: A superconducting rotating machine includes a direct current field excitation source and an alternating current armature winding mounted on a stationary support member, at least one of which includes a superconducting material, a core member formed of a magnetic permeable material and rotatable around the static support member, and a refrigerator unit which cryogenically cools at least one of the field excitation source and the armature winding. The superconducting rotating machine may have a construction for providing polyphase (e.g., three-phase) power.

Abstract: The invention pertains to electrical machines of the electromagnetic type employing a stator and a rotatable rotor such as electric motors and generators wherein magnetic forces imposed upon the rotor produce rotor rotation. The invention utilizes permanent magnets in either the stator or rotor assembly to control the magnetic flux flow in one direction and encourage the flux in the opposite direction in certain areas of the stator and rotor assembly. Rotating flux conducting metal shunts are disposed adjacent permanent magnets creating magnetic flux to control the flux flow and pattern to most effectively use the flux forces on the rotor resulting in very high efficiencies in motor or generator operation.

Abstract: A stator assembly for a linear motor includes a plurality of interleaved modular pieces. Prewound coils and spacer pieces are alternately provided along the length of the stator. The spacer pieces have a generally trapezoidal cross section, complementary to a trapezoidal cross section of the prewound coils. Rims may be provided at an inner region of the spacer pieces. At the outer edge of the spacer pieces is provided a wall which mates with the identical wall on an adjacent spacer piece. The spacer piece may have radial slots cut entirely and/or partially through the piece in order to reduce the current and eddy currents induced when the prewound coils are energized.

Abstract: There is provided a driving unit of a welding equipment capable of reducing the size of the driving unit, of reducing the moment of inertia, and of being compact and having an excellent operability. The driving unit of a welding equipment provided with a pressure application shaft that is driven by a motor comprises a screw shaft provided integrally with or substantially integrally with a rotary shaft of the motor, a nut provided integrally with or substantially integrally with the pressure application shaft and is screwed with a screw of the screw shaft, and a baffling mechanism provided on the pressure application shaft, and wherein the rotary shaft of the motor is positioned substantially coaxially with the screw shaft and a rotary force outputted from the rotary shaft of the motor is converted into a reciprocating motion of the pressure application shaft.

Abstract: A vehicle rotary electric machine to be mounted in an engine is comprised of a rotor having a shaft, a stator, a front housing, a rear housing and a pulley. The front housing has a first mounting stay disposed at a side of the front housing to be fixed to a cylinder block of an engine by a bolt and a second mounting stay disposed at the opposite side of the front housing with respect to the shaft to be fixed to a cylinder head of the engine by a bolt having the same outside diameter. The rear housing has a third mounting stay to be fixed to the cylinder head at the same side of the rear housing as the second mounting stay. The first mounting stay has an elliptical first bolt-hole extending perpendicularly to the stack direction. The a major axis of the elliptical hole extends in parallel to the stack direction.

Abstract: A vibrating apparatus is disclosed, in which a plurality of actuators are provided between a base table and a motion table which are installed on installation parts, each of the actuators being selectively extended and retracted to give motions to the moved portion supported on the motion table, each of the actuators including a screw shaft having a base end provided on one of the base table and the motion table through a universal joint and having a spiral groove formed on an outer periphery; and an electric motor including a rotator which has a base fixed to the other base table or motion table through a universal joint and which is hollow shaft-shaped to permit penetration of the screw shaft and has a spiral groove formed on an inner periphery, the spiral groove being screwed to the spiral groove of the screw shaft. A simulator apparatus is also disclosed, including comprising the vibrating apparatus.

Abstract: A heat sink structure is provided for a rectifier assembly of an air-cooled generator. The heat sink structure comprises a substantially annular base having inner and outer edges. The inner and/or outer edges have (has) a cooling fin arrangement projecting out from the base. The heat sink structure is provided with diode mounts. Each diode mount is adapted to retain a respective diode in a thermally conductive (and preferably press-fit) manner. Heat from each diode is transferred to the base and cooling fin arrangement, to provide a heat sink effect. Also provided is a method of manufacturing a heat sink structure. The method comprises the steps of configuring a sheet of thermally conductive material to include a substantially annular base and radial extensions of the base, and bending the radial extensions so that the radial extensions are substantially perpendicular to the annular base. Perpendicular extensions or prongs thus are defined. A rectifier assembly is provided.