Abstract: The invention relates to a kinetic wheel arrangement comprising a stator and a rotor, magnetic bearings formed by cooperating parts respectively connected to the stator and to the rotor in order magnetically to suspend the rotor with respect to the stator, mechanical bearings to allow the stator to support the rotor when the latter is not suspended magnetically, an inertia flywheel constituting a part of the rotor, and means for monitoring, along the axis of rotation Z--Z defined by the stator, the axial position of the rotor with respect to the stator. According to the invention, this arrangement is characterized in that it comprises a magnetic system for giving the radial rigidity of the rotor with respect to the stator, in at least one fixed radial direction, a value different from that presented by said radial rigidity in the other radial directions. The invention is more particularly applicable to the kinetic storage of energy.

Abstract: A permanent magnet rotary dynamo electric machine wherein each permanent magnet pole is equipped with a flux shunt which provides a direct flux path between the airgap at the strong tip region of the pole and the iron circuit upon which the pole is supported, the direct flux path shunting magnetic flux to the iron circuit when the current in the associated winding is low, but being saturated by flux flowing in the opposite direction at high values of winding current.

Abstract: A two axis linear motor for carrying the objective lens for optical focusing and optical tracking in an optical recording system has a stationary structure for providing a magnetic field and a moving armature structure. The stationary structure may have two permanent magnets and several pole pieces to properly shape the field with respect to the armature. In one embodiment, a central elongated pole piece and two parallel adjacent elongated pole pieces which are associated with two permanent magnets to form flux gaps with the central pole piece. Flux returns to the magnets through a lower pole piece to which the central pole piece is attached. The central and lower pole pieces have an aperture through which the laser beam may pass on its way to and from the objective lens.

Abstract: A linear magnetostrictive actuator with feedback compensation including a force train that has at least one magnetostrictive element, an excitation component disposed on or within the actuator, a feedback apparatus whose output signal is proportional to the magnetic induction within the magnetostrictive element, and actuator control circuitry for providing the difference signal resultant between the feedback output signal and the external signal, such that positional displacement error is compensated by closed loop operation of the actuator.

Abstract: To counteract the effects of centrifugal force on internal blades or vanes positioned in gaps (31) between adjacent claws (22, 23) of a claw-pole rotor (R) of a claw-pole alternator, a plastic sleeve (33) is fitted over the field winding (20) and has cooling fins or vanes or blades (32) projecting radially therefrom, at an inclination with respect to the axis of rotation of the rotor, and located between the inclined faces of the claw poles. The end portions (36, 37) projecting beyond the sleeve may be straight (FIG. 4) or the end portions (38, 39) may be curved (FIG. 5). Preferably, a curable casting compound is cast within the sleeve and secures the winding (20) in position, the sleeve being fitted in form of a circular bandage over the winding.

Abstract: A linear electric motor having an oscillating linear armature disposed in proximity to a stationary stator and provided with an output member which can be directly coupled to a load. A power supply and control circuit is provided for matching the power input to the linear motor according to changing load conditions at the output.

Abstract: A brushless DC motor, most especially a linear motor, has a wound and an unwound part, one part forming the stator and the other the armature, and includes a permanent field magnet arrangement to generate flux and windings linked by the flux. One motor part is provided with a series of flux-conducting portions and the other part is provided with a plurality of flux-carrying portions forming an air gap with the flux-conducting portions. By making the distance from one flux-conducting portion to the next small, and the distance from one flux-carrying portion to the next small, it becomes possible to minimize the distance through which the armature need move to go from a position linking maximum first-polarity flux with a respective winding to a position linking maximum second-polarity flux with that winding.

Abstract: A dynamoelectric machine of the type having a cylindrical rotor including electrical conductors having radial portions and radially extending magnetic portions and including permanent and/or electromagnets to form axial end air gaps between the rotor and the stator, to provide interaction between the magnetic fields in the axial end air gaps and the electrical conductor radial portions and the radially extending magnetic portions to increase the magnetic inductance of the lateral or end stator fields and the armature or rotor.

Abstract: A stator for magnet-type rotating machines comprises projections formed in the inner circumferential surface of a fixed frame in the circumferential direction at a predetermined distance. Position determining pieces, each having elasticity and engaging parts, are fitted to the projections. Permanent magnets are secured between the position determining pieces in such a manner that the raised portions of the position determining pieces are in contact with end surfaces extending in the radial direction of the permanent magnets and the engaging parts are in contact with end surfaces in the circumferential direction of the permanent magnets to effect determination of position of the same.

Abstract: Solenoid actuators which include a stator assembly comprising a plurality of spaced parallel poles having coplanar end faces and symmetrically spaced side faces. An armature is mounted for attraction to and motion with respect to said stator, at least a component of which is perpendicular to the coplanar stator pole end faces and parallel to the pole side faces. The armature comprises a generally flat plate having a surface in parallel opposition to the pole end faces, and a plurality of integral ribs which extend between adjacent pairs of stator poles and have side faces opposed to and parallel to the pole side faces. Thus, the air gap between the stator and armature has a variable dimension component between the pole end faces and the opposing armature, and a fixed dimension component between the rib and pole side faces. The resulting output power versus stroke characteristic exhibits high output power at the beginning of the stroke, followed by a substantially constant power versus stroke function.

Abstract: A variable-voltage electrical generator.

Abstract: An electric machine has a stator body formed of a coil of concentric layers of amorphous metal tape and slots are formed in one end of the coil for receiving a stator winding. A rotor structure having permanent magnet poles embedded therein is placed adjacent the end surface of the stator and is coupled thereto through the axial gap between the stator and rotor. The magnets are held in place in a nonmagnetic matrix which consists of an epoxy fiber laminate material. By enlarging the outer diameter of the rotor with the epoxy fiber laminate material, the rotor serves as an integral flywheel structure.

Abstract: A linear pulse motor includes: a primary body including first magnetic circuit forming members provided with coils; a secondary body including a second magnetic circuit forming member, one of the primary body and the secondary body being movable relative to the other in one direction; the first magnetic circuit forming members including plural pole surfaces in each of which first plural teeth are formed at constant pitch, the groups of the first plural teeth of the plural pole surfaces being shifted from one another in a predetermined order by the pitch length x the reciprocal of the number of the pole surfaces (P/n, where P and n represent the pitch length of the first plural teeth and the number of the pole surfaces, respectively); the second magnetic circuit forming member including second plural teeth of the same pitch as the first plural teeth of the plural pole surfaces; and guide members for guiding the one of the primary body and the secondary body movably in the one direction, arranged between the pr

Abstract: Electric motor with a system for speed monitoring, especially for ventilators, fans, blowers and compressors, where the speed is monitored with the help of a speed-proportional signal, consisting of a stator and a rotor which can rotate in the stator, where the system for speed monitoring consists of a permanent magnet (16) which is mounted in the front end (14) of the rotor (2) which faces the stator (3) and a detector (12) which can be triggered by the magnetic field of the permanent magnet and is located on a circle with its midpoint in the axis (4) of rotation of the rotor (2) and with a radius corresponding to the radius of the circular path of the permanent magnet (16).

Abstract: A brushless, self-commutating DC motor including a tachogenerator for producing speed control signals, the motor having a cup-shaped housing fixed to an output shaft and carrying a cylindrical annular permanent magnet. The motor also includes a stator assembly having six rotor drive coils paired to provide a three phase driving coil system and a tachogenerator yoke and coil assembly forming part of the stator system. The rotor magnet has two tracks of multipolarization formed of an outer track of a plurality of driving magnetic poles and an inner track of tachogenerator magnetic poles of a greater number than the driving poles.

Abstract: An electric motor having two stator sections having co-planar central parts extending between first and second co-planar pole pairs. An excitation coil is provided around each stator central part, and the pole shoes forming the pole pairs are spaced from the coil ends. The stators are preferably laminated from iron sheets, corresponding parts of the sheets of the two sections being co-planar.

Abstract: An improved electric actuator is provided, having in association therewith a resolver. The actuator includes a stationary and a rotatable housing, and an electric motor within it. The electric motor drives the rotary housing through a speed reducing harmonic drive mechanism. The actuator has an opening in the rotary housing, and a cavity inwardly of the opening having a mating anchoring element connected with the stationary housing. A modular resolver is provided, of a shape and size to have a major portion of it occupy the cavity provided in the actuator, and having a mating part for engaging the mating part of the stationary housing, upon assemblage of the resolver to the actuator. A rotatable part of the resolver is secured to the rotary housing. A heat dissipation system is provided, including a fan mounted on a rotary member of the actuator and a closed circuit for the passage of air between the fan and a heat conductive plate forming a part of the stationary housing.

Abstract: A permanent magnet motor having a highly nonuniform reluctance gap between rotor and stator creating reluctance torque which aligns the rotor in narrowly-defined detent zones when the motor coils are de-energized. To overcome the high reluctance torque present at the detent zones upon energizing of the coils, small auxiliary coils are provided adjacent the high reluctance regions of the gap to give the rotor a high immediate starting torque to escape the detent zones and rapidly achieve steady-state angular velocity.

Abstract: An electric rotary device of permanent magnet type has a stator including a plurality of permanent magnets and a rotor rotatably mounted within the stator and including an armature core and a plurality of windings wound around the armature core, said permanent magnets each having an axial length in the direction of the central rotation axis of the rotor, said axial length being a maximum at the center of the permanent magnet and progressively reduced towards both side ends of the permanent magnet.

Abstract: The permanent magnet rotor of a brushless d.c. motor is provided with regions of reduced magnetization in the mid-portion of the poles and spaced from the pole gaps, these regions being offset towards the extremity of the rotor where a portion of the rotor extending beyond the air gap of the motor serves to control a Hall I C sensor for control of the current in the stator windings. The regions of reduced magnetization do not interfere with the rapid switching of the Hall I C, but in a cylindrical air gap motor reduce the axial thrust on the rotor resulting from the asymmetric extension of the rotor out of the air gap which is provided for commutation control. Since this thrust is of a pulsating character, its reduction is important and permits simpler bearings to be used for the rotor shaft. Apart from reducing the axial thrust, the pattern of magnetization above described reduces non-uniformity in the current flow in the windings and therefore also variation in torque during a revolution of the motor.