Abstract: The invention relates to a method for controlling a closed loop linear position servo-motor having an armature including a first group of excitation windings and a second group of excitation windings, and a stator including field magnets disposed radially opposite the first winding group, and feedback windings disposed radially opposite the second winding group.

Abstract: An electromagnetic reciprocating motor or pump for use for providing mechanical force for actuation of other fluids or components, and includes a cylinder provided with closures at each end, at least a pair of electromagnets operatively associated with the cylinder, and surrounding the same, a magnetically responsive piston provided within the cylinder and capable of longitudinal shifting reciprocally within the cylinder upon the sequential energization of the electromagnets, and either a mechanical actuator or electronic triggering components cooperating with electrical circuitry and connecting with the electromagnets which upon energization charging the electromagnets in timed sequence for inducing their reciprocal shifting of the piston within the cylinder means.

Abstract: A vibration wave motor for driving a movable member by a travelling vibration wave generated in a vibration member having an electrostrictive element by applying a periodic voltage to the vibration member, intermittently applies the periodic voltage to the electrostrictive element to reduce a moving speed of the movable member without reducing an amplitude of the periodic voltage.

Abstract: To eliminate rotor reaction in an induction motor, double ring coils are wound on and through the rotor core in addition to the main coils at right angles to the main coil plane. By placement of a nonmagnetic material at the center of the rotor, the flux of the stator and rotor flows in separate paths at opposite sides of the rotor core and not through the shaft, to produce a transformer (induced) m.m.f. in the double ring coils. The flux which occurs due to the current of the transformer (induced) m.m.f. of the double ring coils extends substantially into the air gap by virtue of the nonmagnetic material to abate the effect of the rotor reaction in the air gap.

Abstract: The invention relates to a process for the generation of a plasma by heating up a flowing gas and an MHD generator for performing the said process in order to achieve the generation of electrical power in an economical manner.

Abstract: An electro-expulsive system 20 has one or more overlapped conductors OC1-OCN each comprising a flexible ribbon conductor 32 which is folded back on itself. The conductors are embedded in an elastomeric material 33. Large current pulses are fed to the conductors OC1-OCN from power storage units 1-N. As a result of the antiparallel currents I and I', the opposed segments of a conductor 32 are forcefully separated and the elastomeric material is distended. Void 34 in the elastomer aids the separation of the conductor segments. The distention is almost instantaneous when a current pulse reaches the conductor and the distention tends to remove any solid body on the surface of the elastomeric material.

Abstract: Electric machine has at least one coil with ends of the coil wire fixed to separate connection elements. The connection elements are provided with a relatively thick soft-solder layer of at least approximately 30.mu. thickness. The soldered connection between an end of a coil wire and a connection element can be made by means of a laser.

Abstract: Disclosed is a power supply apparatus for a linear motor transportation system having a number of discrete linear motor units serially arranged along a track to generate a moving magnetic field for driving vehicle.

Abstract: A low inertia, speed variable induction motor comprises a frame, a stator fixedly placed in the frame, a yoke fixedly placed in the frame in opposition to the stator with a predetermined gap and a cup-shaped rotor which is inserted into the gap and is fixedly mounted on an output shaft supported in the frame in a freely rotatable manner. Rotating magnetic field is produced in the gap by the stator and the yoke to generate a rotational torque of the cup-shaped rotor. The cup-shaped rotor is formed of a material or materials having a hysteresis characteristic and an eddy current producing characteristic to obtain a large torque.

Abstract: There is disclosed a linear stepping motor provided with a stationary member; a movable member having a face opposed to the stationary member; a first magnetic device for suspending the movable member in a floating state by magnetic attractive force with respect to the stationary member; a second magnetic device for magnetically displacing the movable member with respect to the stationary member; and a control device for controlling the first and second magnetic devices to determine the position of the movable member with respect to the stationary member.

Abstract: The present invention is a one-phase stepping motor having a predetermined direction of rotation. The motor comprises a rotor having 2p permanently magnetized poles on its outer surface. The rotor is surrounded by a coil, which when energized forms the main stator poles. Auxiliary pole arms extend into the space between the coil and the rotor.The rotor and coil are stored in a two-part housing which magnetically isolates the motor. The auxiliary pole arms extend inward from the top and bottom surfaces of the housing and are formed integrally therewith.The arrangement of the auxiliary pole arms serves to determine the direction of rotation of the rotor. Illustratively, the auxiliary pole arms are divided into groups. Within each group, the auxiliary pole arms are at a distance from the rotor that decreases gradually or in stages in the direction of rotation of the rotor.This one-phase stepping motor is especially suitable for driving counting mechanisms in electricity meters.

Abstract: A small sized fan motor is disclosed, wherein an armature is supported by a disk-shaped support in a cantilever fashion, a rotor has an outer periphery for fixedly mounting a fan having a plurality of blades thereon and an inner periphery for fixedly mounting a permanent magnet thereon in a manner that the permanent magnet surrounds the armature with a clearance being provided therebetween, and a rotational bearing having an inner race secured to the disk-shaped support and an outer race secured to the inner periphery of the rotor in a manner that the rotational bearing is arranged coaxial with the permanent magnet within the rotor.

Abstract: An electromagnetic linear drive including at least two stators divided into motor elements which constitute two paths of movement for movable vehicles in opposite directions is disclosed. An energy supply unit, including a power control unit, is associated with each of two opposed motor elements belonging to one or the other path of movement. The energy supply unit is selectively connectable to the motor element of one path of movement or to the motor element of the other path of movement, as required. When a vehicle is located above both motor elements associated with a single energy supply unit, the common energy supply unit is connected, according to a predetermined selection, to one of the two motor elements or alternated between both motor elements.

Abstract: An electromagnetic motor apparatus is used for converting electrical energy into rotary motion and includes a housing having a crankshaft rotably mounted therein. A plurality of stators form cylinders and are mounted onto the housing. A plurality of armatures form the pistons and are movably mounted to slide in the stators. Each armature has an armature piston rod connected to each armature and to the crankshaft for turning the crankshaft responsive to the movement of the armatures in a timed sequence. A distributor is operatively connected to the crankshaft for distributing electrical energy applied to the distributor from the distributor to the stator windings. The distributor has at least one pair of electrical contacts moving in a liquid bath responsive to the rotation of the crankshaft to direct electrical energy to the stator in timed sequence so that electrical arcing is reduced in the distribution of the electrical energy in an electromagnetic motor.

Abstract: The invention relates to an electric motor having armature means including a plurality of armature segments each rendered into a flat form and arranged in a same plane around a center rotation axis in a manner as to form a circular outline; magnet means including a plurality of permanent magnet segments arranged in a same plane opposite to the armature segments coaxially on one side thereof with an air gap being provided therebetween, each of the permanent magnet segments having end portions in the radial direction defined by a geometrical line dividing the permanent magnet segments one from another, the dividing line being designed to extend in avoidance to be in parallel with a normal extended from the center rotation axis of the armature segments, said dividing line of each permanent magnet segment extending in parallel with another dividing line of the adjacent magnet segment to provide therebetween a groove of a predetermined width.

Abstract: An eddy current coupling has a field coil (42) for magnetically coupling an inductor drum (26) and rotor (28). The thickness of the supporting arm (48) for the coil increases in a step-wise manner in a direction away from the end of the arm. The diameter of the adjacent portions (30) of the rotor is reduced in a corresponding manner to provide a plurality of air gaps (54a, 54b, 54c) across which the flux passes in radial directions. The flux passage and heat removal characteristics of the coupling are enhanced.

Abstract: A dynamoelectric machine of the type having a distributed armature winding in a cylindrical rotor wound to form axial and substantially radial winding portions and including permanent and/or electromagnets to couple magnetic flux into the peripheral or circumferential surface of the rotor, and to provide interaction between a magnetic field formed beyond the rotor axial surfaces and the rotor to thereby enhance the total induction of flux into the rotor for improved, more efficient operation.

Abstract: The present invention relates to a synchronous electric motor of the type comprising at least one rotor part of substantially annular disc form, magnetized axially so as to present, on its opposite flat faces, a series of magnetic poles of alternate polarities, disposed regularly along an annular zone of each face, the rotor part being mounted on a rotary shaft, the motor also comprising an assembly of several elementary magnetic circuits which are insulated magnetically from one another, an annular electric energizing coil which is coupled with the said assembly of elementary magnetic circuits, each of said circuits providing an air-gap and the assembly of these air-gaps forming an annular region in which are disposed the magnetized zones of the rotor part, each of the elementary magnetic circuits having substantially flat C-configuration, being placed substantially radially with respect to said rotor shaft and having a central opening in which is placed said annular coil.

Abstract: An audio frequency electromechanical vibrator comprising a flat plate permanent magnet magnetized in a predetermined direction and a coil wound around the permanent magnet for crossing the direction of magnetization. The permanent magnet and coil are fixedly disposed in a yoke which is elastically supported in a case through a spring plate. The case partly consists of a magnetic plate which is placed for opposing the permanent magnet to form a magnetic flux circuit, whereby the vibrator can generate a vibration corresponding to an audio signal applied to the coil.

Abstract: A linear motor comprises a first magnetic pole having a plurality of uneven magnetic pole teeth of magnetic material arranged longitudinally at predetermined regular intervals of length, and a second magnetic pole having a yoke and plurality of uneven magnetic pole teeth made of magnetic material opposed to the first magnetic pole with a slight gap and a coil wound on each magnetic pole tooth and the permanent magnets, in which the relative position of the first and second magnetic poles in the longitudinal direction can be varied. The longitudinal lengths of the protruded portion of the second magnetic pole are substantially equal with each other. The longitudinal length of the recessed portion of the second magnetic pole is set to about one-third of the longitudinal length of the protruded portion of the first magnetic pole. The number of the protruded portions of the first magnetic pole is set to be a multiple of two.