Abstract: A voice coil actuator includes a magnetic flux conductive material core, a magnet and an electrical current conductive coil. The core has a first surface and a continuous channel disposed in the first surface. The channel has a pair of opposing walls. The magnet is disposed in intimate contact with a first one of the walls and spaced from a second one of the walls so that a gap remains between the magnet and the second one of the walls. The magnet has a first face of a first magnetic polarity facing the first one of the walls and a second face of a second, opposite magnetic polarity facing the gap. The magnet is further spaced from a bottom of the channel so that magnetic flux is substantially normal from the second face across the gap to the second one of the walls.

Abstract: A dc power supply (1) for a dc arc torch (6) comprising: an input port (4, 8) for connection to a source of direct current and an output port for connection to the electrodes (5, 7) of an arc torch; a controlled switch (2) and an inductance (3) connected in series between the input port and the output port; a free-wheeling diode (9) connected such that, in use, it is reverse biased when the switch (2) is ON, and forward biased when the switch (2) is OFF to maintain direct current flow through the arc and the inductance (3); and a feedback circuit (10) having a current sensor (11) to sense the instantaneous value of current flowing through the arc, and a control terminal (26) connected to the switch (2), the feedback circuit, in use, operating to provide a control signal at the control terminal (26) to turn the switch (2) ON when the instantaneous value reaches a first level and OFF when the instantaneous value reaches a second level.

Abstract: A plural output power supply comprises a converter transformer having a first primary winding and first and second secondary windings. A first DC output circuit is driven by the first secondary winding and comprises a first series rectifier, a first series inductor wound on a first core and a first parallel capacitor. A second DC output circuit is driven by the second secondary winding and comprises a second series rectifier, a second series inductor wound on a second core and a second parallel capacitor. A sense transformer or series resistor senses a current in the first primary winding of the converter transformer. Circuitry subtracts the current in the second secondary winding from current sensed from the primary winding. If the first DC output is used to drive the stable load and the second DC output is used to drive the noisy load, the difference in the two currents represents the stable current and is used to control the drive to the primary of the converter transformer.

Abstract: In a radial gap dynamoelectric machine a composite stator ferromagnetic structure having reduced losses is formed using thin section metallic glass or electrical steel strips folded or otherwise periodically deflected on one side or another of one or more planes perpendicular to the machine longitudinal axis edge wound to form a ring-like magnetic structure surrounding separate stator tooth assemblies formed of traditional or thin-section sheet or powdered ferromagnetic materials. Alternative structures are described.

Abstract: In a power supply for use with electronic equipment, the power supply includes a dynamic transformer having a single rotary element with permanent magnets attached, magnetic bearings to support the rotary element during operation, primary and secondary windings linking the flux of the magnets, circuit means to drive the primary windings, and means of using the secondary AC output to provide DC power at the point of use.

Abstract: An engine has a flywheel which has a high peripheral speed even when the engine rotates at a low speed. The flywheel has a plurality of permanent magnets mounted on an outer circumference thereof and having alternately different magnetic poles. A stator is disposed in confronting relation to radially outer ends of the permanent magnets. Electric energy induced by the stator upon rotation of the flywheel is supplied to a rotary electric machine combined with a turbocharger to assist the turbocharger in supplying air under pressure to the engine when the engine rotates at low speed.

Abstract: This invention relates to high-density discoidal brushless induction open frame motors and generators with multistacking, multiphasing and multistaging capability. These motors may be in the range from 10 hp to 25,000 hp or more and these generators may range from 10 kVA to 10 megawatts or more. Rare earth permanent magnets or wound DC field poles are arranged about a disk shaped rotor. A rectangular toroidal lamination core within the stator element serves as the mounting for numerous flat wound armature coils. The heat generated by the high flux and current densities is dissipated by a liquid cooling arrangement built into the toroidal stator element. The absence of the need to use the frame as a flux return path allows light weight aluminum to be used without a loss in efficiency. The open frame structure allows for easy cascading of multiple units along the same shaft for higher capacity.

Abstract: An electrically-energized rotary actuator includes an annular stator ring having a plurality of slot-like magnetic flux obstructions spaced around the ring circumference. An associated rotor has two permanent magnets that are polarized along the rotor diameter to form a south pole at one point on the rotor periphery and a north pole on a diametrically-opposed point on the rotor periphery. Two pole pieces are located at diametrically spaced points on the stator ring, each pole piece having a magnetic winding so that, when the windings are energized, a north pole and a south pole will be established for interaction with the poles formed by the rotor magnets. The flux obstructions in the stator ring cause the rotor to be deflected in steps so that the rotor has various discrete positions centered on the flux obstructions. The rotor can maintain a stable position uninfluenced by minor variations in the current applied to the stator windings.

Abstract: An electric motor used especially for driving windshield wipers of motor vehicles which includes a gear pot and a metal cover with an outside and an inside and a plastic component which is injection-molded substantially at the outside of the cover and into which at least one conductive strip punched out from a metal blank and positioned substantially at the outside is embedded. In order to achieve an exact position of the conductive strip, the conductive strip is supported by a holding device from the inside of the cover through an aperture in the cover during the injection molding process. The plastic component includes at least one recess within the aperture in the cover which is open towards the inside of the cover and extends up to the conductive strip, unless the recess is filled with material afterwards.

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 direct current motor having one or more armatures supported between magnetic pole plates having pairs of pole pieces extending, in diametric opposition with respect to the periphery of an armature between the plates adjacent the perimeter of the armature or armatures, and is energized by direct current through one or more iron coil cores interposed between and connected with the magnetic pole plates. Wiring and electrical current controls connect a DC source to the coils and armatures for selectively operating the armatures and providing a selected torque with a minimum of ampere drain from the DC source.

Abstract: An improved armature for a small motor comprising a stator core constructed by laminating a plurality of magnetic plates having a plurality of salient poles projecting radially from a ring section, driving coils wound around coil winding sections created on the salient poles, winding slots created at positions where the salient poles adjoin each other and an insulating holder for insulating connecting sections for connecting end wires of the driving coils and lead wires from the driving coils; wherein the insulating holder comprises a plurality of insulating sections created in a manner communicating with each other in the lamination direction of the stator core to be mounted to the slots; holes penetrating through the insulating sections in the lamination direction for inserting the connecting sections and the vicinity thereof and a linking section for linking an end of each of the plurality of insulating sections.

Abstract: An electric generation system includes an electric generator swung in a orbit and having an external contact surface for rotation of its armature by a rolling engagement with an enlarged band. The band can be turned relative to the generator within a larger diameter retaining ring so that the band is constantly radially inclined at its contact point with the generator contact surface.

Abstract: A starter motor with an intermediate gear wheel. The starter motor includes an interposition member interposed between the front end of a clutch cover fitted onto an overrunning clutch and the rear end of an intermediate gear wheel, a movable connecting member including a boss portion which is loosely fitted onto the outer circumference of an extended boss portion projecting backwardly from the rear end portion of the intermediate gear wheel, and a circular-arc-shaped fitting portion which is formed integrally with the rear end portion of the boss portion to extend upwardly and which is fitted to a lower half portion of a fitting groove formed at the rear end portion of the overrunning clutch so as to be movable in the axial direction of the clutch.

Abstract: A brush holder for an electrical brush includes a brush holder body and an improved spring clip arrangement. Included in the brush holder body is a spring clip pocket and a brush pocket. The brush pocket slidably guides an electrical brush therein and a spring clip assembly, including a generally V-shaped spring clip with a shoulder stop, is sized to be received in the spring clip pocket. The shoulder stop on the spring clip engages a stop in the brush holder body when the spring clip is seated in the spring clip pocket. The spring clip assembly includes a constant force spring for applying a constant force to an electrical brush in the brush pocket when the spring clip is in the seated position. A latch pin engages a latch aperture in one leg of the spring clip, when the spring clip is seated, and a cross pin removable from the top of the brush holder body, controls separation of the spring clip from the brush holder body when the spring clip is retracted from the spring clip pocket.

Abstract: An electromagnetic thrust bearing couples a rotatable member relative to a stationary member utilizing a combination of arcuately shaped constant flux permanent magnets and controllable electromagnets, each physically associated with the stationary member. More particularly, the rotatable member comprises a shaft having a radially extending thrust disc fixed thereto. A pair of solenoids are disposed about the rotatable member in facing relation on opposite sides of the thrust disc. The facing solenoids are capable of generating a controllable electromagnetic field. A constant flux high density magnetic field is generated between the solenoid housings and the thrust disc by a pair of axially polarized arcuately shaped permanent magnets disposed on each side of the thrust disc. Each pair of permanent magnets has an inner magnet and an outer magnet radially separated from one another. Each permanent magnet is linked magnetically to the adjacent solenoid housing by respective ferromagnetic pole pieces.

Abstract: In a safety system for a stepper-motor drive, a stepper motor for operating a throttle valve has poles with windings. Each pole winding is divided into part-windings, each of which is driven by a dedicated output stage. As a result, in the event of a failure of a part-winding or an output stage, it remains possible to control the stepper motor.

Abstract: A two compartment motor has a frame, a pair of end shields disposed adjacent opposing ends of the frame to define a first compartment, a stator winding supported by the frame within the first compartment, an armature rotatably supported by the end shields and disposed within the first compartment adjacent the stator winding, a cover mounted to the motor adjacent one of the end shields to define a second compartment between the cover and the end shield, and a control plate mounted within the second compartment. The control plate serves as a mounting surface for securing a plurality of electrical components used in the control and operation of the motor in position within the second compartment. The control plate is a molded plastic component having integrally formed mounting mechanisms for at least one of the electrical components. The electrical components may include a starting capacitor, voltage and/or speed control switches, an overload device and electrical terminals.

Abstract: A piezoelectric ink droplet ejecting device drivable with a low voltage, simple in structure, less costly to manufacture and capable of producing printed data with high resolution. A piezoelectric ink droplet ejecting device has a plurality of ink ejectors each composed of a piezoelectric transducer for varying the volume of an ink passage to eject ink out of the ink passage. A single piezoelectric ceramic panel which is polarized in a thickness direction has a plurality of through holes parallel to the polarized direction. The through holes serve as ink passages. When a driving electric field is applied in a direction perpendicular to the polarized direction, the piezoelectric ceramic panel is elastically deformed under thickness shear effect, thus varying the volume of the ink passages to eject ink droplets therefrom.

Abstract: A brush unit having a brush, a lead extending from the brush, a metal terminal plate connected to the lead, and a compression spring interposed between the brush and the metal terminal plate. The brush unit is assembled in advance of mounting the brush unit within a blush box. Thereafter, the brush unit is inserted into and held by the brush box through a solder connection between the metal terminal plate and an electrode portion projecting from the brush box. Accordingly, the brush can be easily assembled within the brush box.