Abstract: A plane commutator is comprised of a plurality of commutator segments, a plurality of base plate and a resinous boss member. The commutators are made of sintered carbon compound and disposed to provide a plane commutator surface at an end thereof and a base portion at the other end. Each commutator segment has a projection extending from the base portion. The resinous boss member is disposed in contact with the base portion. Each base plate has an engagement hole, to which one of the projections is fitted, and a terminal portion that extends along an outer periphery of the boss member. A powder-accommodation pocket is formed around a foot of each the projection so that the projection can be shaved by a corner edge of the hole. This ensures good contact of the commutators with the metal base plates and provides a sufficient manufacturing tolerance.

Abstract: A method and apparatus for controlling the power output of an internal combustion engine in a vehicle, wherein a motor/generator or a generator/motor is coupled to the output shaft of the engine and the positive and negative torque of the motor/generator or the generator/motor is varied to control the power output of the engine as a function of speed for all manners of performance of the vehicle. The engine operates along a predetermined ideal operating line at all speeds of the vehicle.

Abstract: A rotor for a synchronous machine is disclosed that comprises a rotor core having a rotor axis, and a pair of super-conducting coil windings mounted on the rotor core, each of said coil windings in a respective plane that is parallel to and offset from the rotor axis.

Abstract: A piezoelectric device is disclosed, which includes a first element of porous crystalline material, a second element being attached to, or integrally formed with, the first element, and at least one electrode being in electrical contact with the first element, such that subjecting the first element to an electric potential via the at least one electrode results in a strain induced by the first element on the second element. Also disclosed is a piezooptic device which includes a first element of porous crystalline material, a second element being attached to, or integrally formed with, the first element, and a light source, such that subjecting the first element to light originating from the light source results in a strain induced by the first element on the second element.

Abstract: A piezoelectric/electrostrictive device that includes a base having a pair of right and left movable parts and a fixing part disposed at one end thereof, and piezoelectric/electrostrictive elements disposed on the sides of the movable parts of the base. Accordingly, the piezoelectric/electrostrictive device is fabricated to have a construction with fewer components. The piezoelectric/electrostrictive device having a construction with fewer components is provided by adopting a base having an integral structure formed by bending an original plate stamped into a shape that delineates a plane development of the base.

Abstract: An electrical motor or generator comprises a rotor 79 without windings, a stator 78 having armature windings comprising at least two coils A1, A2 having active portions positioned within armature winding slots 81 in a stator iron, and field windings F having active portions positioned within field winding slots 80 in the stator iron. An electronic control circuit is provided for controlling the currents in the coils A1, A2 in synchronism with rotation of the rotor such that periods in which a magnetomotive force is generated in one direction by current flow in one of the coils alternate with periods in which a magnetomotive force is generated in the opposite direction by current flow in another of the coils. The armature winding slots and the field winding slots are equal in number and alternate with one another in the stator iron.

Abstract: A motor includes a motor unit and a speed reducing unit. The speed reducing unit has a gear housing. The gear housing includes a circuit board receiving portion and an opening that faces the motor unit. A control circuit board is received in the circuit board receiving portion through the opening in an axial direction of a rotatable shaft. When the motor unit is assembled to the speed-reducing unit, the control circuit board is clamped between the speed-reducing unit and a cover connected to the motor unit.

Abstract: With the disclosure shaft drive device, has a PCB device (1, 1′); a rotor device (50; 5, 51) with a rotor (5) and a rotor shaft (51) attached to it; and a stator device (40) for driving the rotor (5) with the rotor shaft (51); an attachment device (60) for attaching the rotor device (50; 5, 51) and the stator device (40) to the PCB device (1, 1′) in such a way that the PCB device (5) forms part of the frame, surrounding the rotor shaft, of the shaft drive device.

Abstract: A brush assembly for an electric motor has a base which secures the brush assembly to a motor spider. A brush housing is associated with the base and has first and second open ends. A brush defining an axis is movably positioned in the housing between the first and second open ends. The brush extends from one of the open ends of the housing. The brush includes a surface which is at a desired angle with respect to the brush axis. A biasing member exerts a force on the brush to bias the brush into an electrical connection with a commutator. An electrical connector electrically couples the brush to provide an electrical connection between the commutator and a power supply.

Abstract: A vibration type actuator has an elastic member in which a shaft center portion is formed in hollow shape along an axial direction and in which driving vibration is generated in a driving portion, a fastening member which fastens the elastic member to an electro-mechanical energy conversion element, an output shaft which penetrates the shaft center portion of the elastic member, a moving member which is kept in press contact with the driving portion of the elastic member and which rotates together with the output shaft, and a bearing member which is located between an inner periphery portion of the elastic member and a distal end portion of the fastening member and which journals the output shaft.

Abstract: A godet roll for guiding, heating and conveying yarn on the circumference of a hollow-cylindrical godet roll casing. The godet roll casing is seated on a projecting support by at least one magnetic bearing having bearing pole windings, and a heating device with heating pole windings is arranged on the support. Some bearing pole windings and at least one heating pole winding are arranged together in one bearing plane, so that the bearing areas can be heated. Sensors provided for detecting the position of the godet roll casing are arranged outside of an annular chamber formed between the godet roll casing and the support in order to prevent a thermal overload of the sensors.

Abstract: An image reading apparatus used for a motor to scan an original for image reading, includes a first damper mounted on the drive shaft of the motor to reduce vibration caused during acceleration for raising up to a target speed at the start of the load driving of the motor, and a second damper mounted on the drive shaft of the motor to reduce vibration caused during the constant speed driving of the motor to thereby reduce vibration caused during the driving of the motor.

Abstract: An ordinance platform with a variable reluctance electric motor is provided. The motor has a stator integrated with a bearing race which is fixably connected with the tank body. The bearing race provides the function of a rotor and is fixably or integrally connected with the tank turret. The rotor is vertically supported by the stator for rotational movement by a plurality of ball bearings. The stator is formed having a plurality of individual phase segments which are arranged in an annular array. Each of the stator phase segments is provided with a phase winding and a plurality of stator pole teeth. The stator phase windings are connected individually to respective driver circuits so as to essentially create a plurality of individual stators about the rotor. The rotor race is formed and is provided with a plurality of rotor pole teeth which are disposed adjacent the stator pole teeth.

Abstract: The present invention relates to a stepping motor.

Abstract: An external connection structure for an electric motor in which basic members are able to be commonly used in an electric fan motor for which either a lead wire or a direct coupler are prepared as an external connection member. Tip end portions of first and third conductor plates and the tip ends of the second and fourth conductor plates are caused to extend between respective brushes which are adjacent to each other in the circumferential direction of the holder stay, and the tip end portions can be made visible through through-holes provided at the body portion of the end cover.

Abstract: To provide an orientation device capable of efficiently orientating resinous magnets filled in slits of a rotor core. An orientation device comprising a plurality of permanent magnets 5 disposed at the same intervals as slits 2 in the rotor core 1 with their magnetic poles of the same polarity adjacent to each other, along the outside circumference of a rotor core housing section 4 for housing the rotor core 1, and a plurality of pole pieces 6 disposed between the plurality of permanent magnets 5, wherein the width of the pole piece 6 at the end 6a on the side of the rotor core housing section 4 is no larger than the maximum width &agr; max of an outermost slit 2a of the rotor core 1 between opposite ends thereof.

Abstract: A compact electrical motor, particularly adapted to act as the driving component of a centrifugal pump, has a hemispherical rotor mounting the impeller and comprising at least two permanent magnetic poles. A thin, waterproof and static septum intimately surrounds the rotor. A circular stator includes a bowl-shaped yoke and a winding applied to the inner surface of the yoke and comprising segments running in successive, alternate sections obliquely to the motor's axis of rotation between the upper and lower rim of the yoke. The successive foldings of the strands about the upper and lower rim of the yoke substantially eliminates the electro-mechanically inactive and power-dissipating portions of the stator or winding found in motors of the prior art.

Abstract: A piezoelectric transformer including a piezoelectric body which includes a primary portion and a secondary portion, both the primary portion and the secondary portion being able to generate and transform piezoelectric vibrations in accordance with an AC Voltage fed to one portion while a transformed voltage can be delivered from the other portion, the piezoelectric body being constituted by a substantially annular body the primary and secondary portions of which have been polarized substantially perpendicular to the peripheral direction of the annular body, the transformer being adapted to be operated at a resonance frequency of a dimension of a cross-section of the annular body substantially perpendicular to the peripheral direction of the annular body.

Abstract: A voltage regulator of a vehicle AC generator is comprised of a field current switching circuit connected to a field coil, a control circuit for controlling the field current switching circuit according to an output voltage of the armature coil; a power circuit for supplying electric power to the control circuit, a power drive circuit for controlling supply of electric power of the power circuit to the control circuit, and a rotation speed sensor. The power drive circuit supplies electric power from the power circuit to the control circuit if the rotation speed becomes as high as a predetermined speed.

Abstract: An ultrasonic motor includes a stator having a piezoelectric element and a rotor facing the stator. The piezoelectric element is annular and is polarized into segments in the circumferential direction. A flexible plate is fixed to the piezoelectric element with an electrode plate in between. The flexible plate includes a flexible substrate, a conductor, and a reinforcement. The conductor is located on a part of the flexible substrate to be electrically connected to the electrode plate. The reinforcement is located on the flexible substrate at a position that is off the conductor. The reinforcement suppresses vibration generated at a part of the piezoelectric element that is off the conductor, thereby stabilizing vibration of the piezoelectric element in the circumferential direction.