Abstract: A tubular linear motor is provided having a secondary and a primary. The primary consists of a plurality of laminations and coils. Each lamination has a width with a plurality of notches removed therefrom, and a first end and second end, with a length extending therebetween. When the laminations are aligned, the notches collectively form channels which receive the coils. The plurality of coils are arranged in poles, each pole having a discrete number of coils corresponding to the number of phases in the current driving the linear motor, or a multiple thereof. A percentage of the coils corresponding to the phase closest to the first end of the primary, is positioned at the second end of the primary.

Abstract: The invention relates to a monophase electromagnetic actuator which includes a rotor (1) with a cylindrical magnetized section (5) divided into two N poles transversely magnetized in alternate directions. The actuator also includes a stator structure consisting of a first magnetic circuit (2) and a second magnetic circuit (3), which are joined only by non-magnetic linking parts. Application: miniature actuators for precision and instrumentation work.

Abstract: A covering for electrical machines has at least one film which is placed around a pole housing and around parts attached to the pole housing and which is permanently shrunk onto the pole housing and the parts.

Abstract: A rotor for rotary electrical machinery comprising a permanent-magnet member made of a mixture having ferromagnetic material powder and a binder resin for chief ingredients, and a shaft, in which a recess whose projected contour on a plane orthogonally intersecting the axial line of the permanent-magnet member is of a non-circular shape is provided at least an end face of the permanent-magnet member, and a shaft is press-fit into a metallic bush fitted to the recess, thereby ensuring high coaxiality tolerance between the permanent-magnet member and the shaft, easy assembly and low manufacturing cost.

Abstract: A dynamoelectric machine rotor comprising a plurality of substantially trapezoidal prism-shaped permanent magnets mounted on a magnetic yoke. Each of the magnets has magnetic pole faces in circumferential plane, side surfaces in a plane perpendicular to the rotary shaft and a front and a rear skewed surface slanted in different directions with respect to a plane parallel to the shaft. The magnetic pole faces of the magnets have alternating magnetic polarities in the circumferential direction, and the front and rear skewed surfaces of the neighboring permanent magnets are in parallel to each other. A ferromagnetic end material may be attached on the magnetic pole face of the magnets, and a ferromagnetic side material may be attached to at least a front and a rear skewed side surfaces of the magnets for increasing of the magnetization of the magnets by a stator flux.

Abstract: A miniature motor including a housing formed into a bottomed hollow cylindrical shape, on the inner circumferential surface of which a permanent magnet is fixedly fitted; A rotor is provided having an armature, a spark-quenching element and a commutator. An end bracket is provided having brushes fitted to the open end of the housing and making sliding contact with the commutator. Input terminals are electrically connected to the brushes; The rotor is rotatably supported by bearings provided on the housing and the end bracket, in which the spark-quenching element is formed by a laminated ceramic capacitor formed into a ring shape, having on the outer surface thereof the same number of electrodes as the number of poles of the armature; The electrostatic capacity of the capacitor is more than 1 .mu.F.

Abstract: The stator of the alternator has a delta winding with each winding having twelve coils. Three diode bridges are provided with each bridge being connected to the junction of two of the windings. Each bridge has four positive diodes connected in parallel and four negative diodes connected in parallel. Two of the positive diodes of each bridge and two of the negative diodes of each bridge are connected to a first output member and the other two positive diodes and the other two negative diodes of each bridge are connected to a second output member. Two heat sink plates are connected to the inside of one wall of the alternator housing and a third heat sink plate is connected to the outside of the wall. Each plate supports diodes from three of the bridges.

Abstract: A miniature motor including a housing formed into a bottomed hollow cylindrical shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, an end plate engaged with an opening of the housing, and a rotor rotatably supported by bearings provided on the housing and the end plate. Power is fed to the motor by bringing a commutator constituting the rotor into sliding contact with brushes, in which a plurality of brush pieces branched from the brush are formed in such a manner that tangential lines formed by the brush pieces with respect to the commutator at predetermined contact points are made different at the tips of the brush pieces, and that the tips of brush pieces make different angles from the lines extended in the longitudinal direction of the brush pieces. The tips of brush pieces are bent to form a V shape in cross section. The tips of the brush pieces come in contact with the commutator at the opened legs of the V-shaped cross section.

Abstract: A micro electrostatic cooling fan arrangement is provided which includes a heat source having a planar surface, a stator attached to the heat source, an axle attached to the heat source and spaced from the stator, a rotary element including a hub having an aperture therein and a fan blade, the axle passing through the aperture of the hub and the fan blade having a major surface thereof disposed at an angle with respect to the surface of the heat source and attached to the hub at one end, with the other end of the fan blade being adjacent to but spaced from the stator and a voltage source applied to the stator having sufficient voltage to charge the fan blade.

Abstract: A rotor assembly for a synchronous reluctance dynamo/motor machine has a plurality of axial laminations comprised of alternate magnetic and non-magnetic materials. The rotor has an end cap on each axial end which engages the stepped axial ends of the laminations.

Abstract: An electromagnetic accelerator arrangement includes a stationary arrangement including at least one stationary primary coil, and a movable arrangement including at least one moveable secondary coil. The planes of the stationary and the moveable coils are parallel to a direction of movement of the moveable arrangement. The coils of the stationary and the movable arrangements have approximately the same coil width in the direction of movement of the moveable arrangement and transversely thereto, as well as the same coil separation in the direction of movement of the moveable arrangement. The at least one stationary primary coil includes at least two layers between which the at least one secondary coil of the movable component is movably disposed, the distance between the layers being kept small transversely to the direction of movement of the moveable arrangement.

Abstract: In order to compensate for the effects of mechanical oscillations of the salient pole rotor in a synchronous machine in a simple manner, control coils are provided which generate a controllable quadrature-axis magnetic field. The control coils are arranged on the salient pole rotor in such a way that the quadrature-axis magnetic field generated by the control coils is superimposed in the air gap on the controllable direct-axis magnetic field generated by exciting coils enclosing each pole body of the salient pole rotor.

Abstract: A magnetic bearing is provided which may be utilized in a fine position control or movement system. Stability is enhanced by providing separate mechanisms for supporting the weight of a platen or other object being controlled with electromagnets utilized to control or compensate for motion of the platen in N degrees of freedom. The support mechanism is preferably one or more permanent magnets having an air gap with the platen which is greater than the air gap for the electromagnets. The mechanisms for supporting the weight of the platen may be made adjustable so as to support the weight of the platen regardless of any changes in such weight by, for example, adjusting the air gap for the permanent magnet to compensate for weight changes. Resonant vibration is reduced by constructing the platen of a hollowed, cellular structure, for example, a honeycomb structure.

Abstract: A small D.C. motor (1) provided with a flat circular or square PTC thermistor (8) between an input terminal (7) and phosphor bronze plate (6) connected to the motor brush (5). The thermistor has electrodes on both faces and an opening provided substantially in its central portion, and it is fitted on the inside or outside of the motor casing (2). The motor shaft (9) or an extension thereof is passed through the opening in the thermistor in such a manner that the plate surface of the PTC thermistor (8) is nearly perpendicular to the shaft (9).

Abstract: A switching current converter is connected in parallel with each controlled power switch in an electric circuit so that it is allowed to operate from the input voltage and transfer energy from input to output during the turn-on periods of the controlled power switch, whereby each power switch is allowed to be turned ON when a near-to-zero voltage is present across it. The switching converter serves as an active power switch stress relieving means, resulting in minimizing the switching loss in the power switch while providing the energy for operation of the power switch in a very efficient way.

Abstract: A limited large angle dynamoelectric machine generates a constant torque over an arc greater than 180 degrees without discontinuity and zero cogging. At any given location of the rotor, the flux path of the machine only crosses the stator coil at a single location. This results in the elimination of any type of commutation of the stator coil.

Abstract: A moisture-proof coupling, which is simple in design and easy to assemble, is disposed between a motor housing and a bearing plate, with the electrical leads running out through the moisture-proof coupling. The electrical leads are integrally molded in an insulated lead-insert, which can be inserted into an opening on the end face of the bearing plate. A circumferential sealing ring is molded on the insulated lead-insert. The sealing ring is injection-molded together with the lead-insert on a brush plate so that it can be pre-positioned and, when the motor is assembled, can be pressed between the motor housing and the bearing plate to form a seal. The brush plate can be fixed together with the lead-insert and the sealing ring in the bearing plate in the manner of a pre-assembled component.

Abstract: A method and an apparatus for symmetrically modulating a controlled series compensation system (2) in electrical networks (6). Impedance manipulated variables determined from a current control for the series compensators (14) of the system (2) are limited by determining an upper or lower limiting value (Z.sub.OO,Z.sub.OU). The upper and lower limiting values are respectively determined by adding a positive or negative deviation (.DELTA.Z.sub.+,.DELTA.Z.sub.-) to and subtracting it from a reference manipulated variable (Z.sub.O) for impedance. The reference manipulated variable (Z.sub.O) for impedance is selected from the impedance manipulated variables (Z.sub.y1,Z.sub.y2,Z.sub.y3). Thus, small asymmetries can be corrected and, given network faults of generally only a brief duration, unnecessary control deviations can be avoided.

Abstract: A stepping motor having two stator units axially arranged. Each of the stator units includes an inner yoke and an outer yoke having a plurality of pole teeth circumferentially formed at a predetermined pitch around a rotor having magnetic poles. The outer yoke of one of the stator units is asymmetrically arranged so that the pole teeth thereof are shifted from center between the pole teeth of the inner yoke in a specific direction. As a result, a cogging torque is reduced, constant speed rotation is attained and variations in the output torque are eliminated. Variation in the generated torque are also reduced by controlling the drive pulse width, the drive voltage or the drive current during the driving operation in accordance with the number of excitation phases.

Abstract: The brush holder 12 of a brush device for a d.c. machine is provided with plural pairs of brush boxes 12a each having an open front portion and an open inner diameter portion, and a pair of projections 12d at outer portions; lead wires 14a, 14b for each pair of brushes 13a and 13b have such length that they can avoid interference with the projections 12d, and the brushes 13a, 13b can be fitted to the brush boxes 12 from the front side and in the axial direction of the brush holder 12; brush springs 15 are put at the top portion of the brushes 13a, 13b; and an insulating plate 16 is attached to the front of the brush holder 12, whereby assembling work for the brushes 13a, 13b can be automated.