Abstract: An electromagnetic stepper motor has a drum-type rotor rotatable about an axis and provided with a plurality of permanent magnets distributed over its circumference, a stator surrounding the rotor and comprising a plurality of permanent magnets and an electromagnet provided on each of the permanent magnets of the stator and connectable with a commutator, wherein each of the electromagnets including a plurality of electromagnet members located one after the other in a circumferential direction so that during an interaction of the permanent magnets of the rotor and the electromagnets of the stator the electromagnet members are switched on one after the other.

Abstract: An alternator has a rotor with a plurality of permanent magnets disposed between opposing claw pole members and a field coil. The plurality of permanent magnets are secured to at least one ring-shaped carrier which surrounds the field coil and locates the magnets into appropriate positions between the fingers of the claw pole members.

Abstract: An automotive alternator has a rotor including a first single coil Lundell portion and a second permanent magnet portion. Permanent magnet poles are axially aligned in spaced adjacency with the fingers of the magnetic members of the Lundell portion of the machine. The current through the field coil of the Lundell portion is controllable in magnitude and direction to control the output of the machine.

Abstract: A switched reluctance motor has groups of adjacent poles of the same polarity. A starting magnet is fitted to one side of one or more of the poles in one or more of the groups. The polarity of the magnet can be the same as that of its host pole. The starting magnet influences the rest position of the rotor when it is not being driven so that the rotor will not be in an orientation such that it will not start when the stator poles are energized.

Abstract: An engine-driven generator having a battery powered starter motor includes a permanent magnet battery charger/pre-exciter for charging the starting battery and for exciting the main alternator field winding of an AC synchronous alternator included in the engine-driven generator. A first winding in the permanent magnet battery charger/pre-exciter provides power to a first voltage regulator that, in turn, maintains a desired load voltage substantially independently of alternator loading. A second winding within the permanent magnet battery charger/pre-exciter supplies power to a second voltage regulator that maintains a desired battery charging voltage substantially independently of the alternator loading. Use of the permanent magnet battery charger/pre-exciter maintains a desired battery charge current and a desired main alternator field excitation substantially independently of the load current supplied by the alternator.

Abstract: A brushless, permanent magnet dynamo-electric machine (50) has a stator assembly (52) and a rotor assembly (RA). The rotor assembly includes a rotor (R) mounted on a rotor shaft (RS). The stator assembly has a plurality of inwardly salient poles (54) and the rotor has a plurality of outwardly salient poles (RP). The rotor is comprised of a plurality of stacked rotor laminations (L) defining the rotor poles, and there is an air gap (G1) between the rotor and stator poles. An improvement (56) of the present invention controls the available flux coupled between the rotor and stator assemblies. A coil (70) is supported on a magnetic mounting structure (66) which is connected to an endwall (W) of the motor housing and fits the coil over the rotor shaft. D.C. current is supplied to the coil. A plurality of magnets (82a, 82b) extend the length of the lamination stack and the magnets are positioned adjacent an outer face of one pole for each set of rotor poles.

Abstract: A hybrid alternator includes a stator and a rotor, with the rotor having longitudinally separate wound field and permanent magnet rotor portions. A rotor excitation circuit applies a forward polarity to the wound field rotor portion to increase output in a boosting mode at low RPMs and a reverse polarity to decrease output at high RPMs in a bucking mode to maintain a constant voltage output. Alternative embodiments combine a magnetic flux concentrating design for efficient low speed operation with integral strength for high speed capability. Dual voltage output is provided either through dual stator windings or through a voltage converter circuit. Single voltage output is provided using only one stator winding. A three state voltage regulator allows voltage regulation without inducing reverse currents onto the power bus in the lightly loaded or no battery conditions. The regulator has automatic interlocking to automatically turn on and off without risking damage to the vehicle electrical system.

Abstract: A motion producing device using permanent magnets as the source of energy including one or more permanent magnets at least one having a coil mounted on it, and an electric circuit for connecting the coil to a source of electric energy whereby application of the energy to the coil changes or modifies the magnetic characteristics of the permanent magnet on which it is mounted in such a manner that when another permanent magnet is in the field of the controlled permanent magnet, the interaction between the permanent magnets will be modified so as to change the coupling force therebetween. The present device can be used to produce rotational motion, linear motion, oscillating motion, and combinations of these.

Abstract: The present invention relates to an apparatus having spaced permanent magnets positioned so that there is magnetic interaction between them, and controlling the interaction by having a coil in the space between the permanent magnets connected to a source of electric potential and a controllable switch in series such that closing the switch places a voltage across the coil and predeterminately affects the magnetic interaction between the spaced permanent magnets. The invention also teaches mounting one of the permanent magnets on a rotatable structure so that the spaced permanent magnets can move relative to each other, the controllable switch operating to control the application of electric potential across the coil in such a manner as to produce relative rotational movement between the spaced permanent magnets.

Abstract: An electromagnetic vibration generator includes a housing, a U-shaped magnet core disposed in the housing and having parallel-extending legs each terminating in a pole face, and an excitation winding inserted on each core leg. The magnet core is encased in cast resin in the housing. The vibration generator further has an armature adapted to be vibrated by an excitation current flowing through the excitation winding. The armature is separated from the pole faces by an air gap. Arrangements are provided for reducing effects of heat expansion of components of the vibration generator on the air gap width.

Abstract: A hybrid alternator includes a stator and a rotor, with the rotor having longitudinally separate wound field and permanent magnet rotor portions. A rotor excitation circuit applies a forward polarity to the wound field rotor portion to increase output in a boosting mode at low RPMs and a reverse polarity to decrease output at high RPMs in a bucking mode to maintain a constant voltage output. Alternative embodiments combine a magnetic flux concentrating design for efficient low speed operation with integral strength for high speed capability. Dual voltage output is provided either through dual stator windings or through a voltage converter circuit. Single voltage output is provided using only one stator winding.

Abstract: A brushless polyphase DC motor is applied to a spindle motor for a disk device and has a stator generating a magnetic field in an excited state and a rotor obtaining turning force by the electromagnetic interaction with the stator. When an electrical charge current is intermittently and alternately supplied to the coil of the stator in opposite directions, for example, if electrical charge is stopped after current in the normal direction is supplied, a residual magnetic field density is generated in the stator during the stopping period. The residual magnetic flux density is employed for performing electrical charge in the reverse direction by supplying current in the reverse direction. In this case, a high torque is generated by increasing a change in the magnetic flux density.

Abstract: A superconducting rotating machine comprises a cylindrical frame, a stator installed integrally around an inner periphery of the cylindrical frame and a rotor arranged concentrically and rotatably within the stator in a juxtaposed spaced relationship to the inner surfaces of the stator and with a cylindrical clearance between the inner periphery of the stator and the outer periphery of the rotor. The stator coil includes a primary coil having extra fine Cu filaments and a secondary coil having extra fine filaments made of a superconducting alloy containing Cu, Nb.sub.3 Sn, V.sub.3 Ga, V.sub.3 Ge, Bi, Ca, CuO and Sr. The secondary coil is covered with an insulating layer. Even if a conventional rotatable cryogenic container is not provided, a strong anomalous pseudo-Josephson effect can be obtained. A superconducting generator for use in lighting equipment is also disclosed.

Abstract: A rotary electric motor has a stator core (1) with salient poles (4, 3), some of them ferromagnetic and some of them permanent-magnetic, which are spaced-apart and which are all simultaneously magnetizable by means of a magnetizing winding (5A, 5B). The rotor core has either reluctance poles (7) with intervening pole gaps and constant pole pitch, or permanent-magnetic poles (10) with constant pole pitch and without intervening pole gaps, alternating poles being of opposite polarities. Each reluctance pole (7) or permanent-magnetic pole (10) has a width which over a portion of the pole corresponds to respectively one-half of or the full pole pitch and is smaller over the remaining portion so that each pole (7 or 10) has a part (7B or 10A) which projects in a direction common to all poles. The ferromagnetic and permanent-magnetic poles (3, 4) of the stator (1) have a width corresponding to the width of the narrower portion of the poles (7 or 10) of the rotor (2).

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 hybrid single-phase variable reluctance motor (31) has a stator (33) having a plurality of inwardly salient teeth (41A-41D) terminating at a central bore (37). The teeth are arranged in generally diametrically opposed pairs of teeth and are generally evenly spaced around the bore. A phase winding (43) is operatively associated with one pair of the stator teeth. The winding, when energized, causes a temporary magnetization of the stator teeth. A rotor (35) is disposed for rotation in the bore and has outwardly salient teeth (45A, 45B) generally diametrically opposed to each other. A permanent magnet (53) is disposed adjacent the bore at the end of one tooth (41D) of a second pair (41C, 41D) of stator teeth. One tooth (41D) of the second pair of stator teeth is offset with respect to a longitudinal axis (A.sub.1) of the second pair of teeth. This offset acts to eliminate a stable detent position in which the rotor could otherwise "park" itself when it stops running.

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: An electrical generator (10) having particular utility as a vehicle alternating generator includes a planetary gear set (32) for providing counter rotation of a pair of fields (80,82) with respect to a coil (60) so as to provide high power output even at relatively low speeds of driving without providing excessive rotational speed at high speeds of driving. In one embodiment, the planetary gear set (32) includes a ring gear (36), a sun gear (44), and a planet carrier (50) whose planet gears (52) rotate about associated axes parallel to the rotational axis A about which the planetary gear set operates. In another embodiment, the planetary gear set has a bevel gear construction including first and second bevel gears (36',44') rotatable about the rotational axis of the planetary gear set and meshed with bevel type planet gears (52') of the planet carrier (50') so that the two field (80',82') have counter rotation with respect to each other at the same rotational speed.

Abstract: An improved salient pole configuration for a dynamoelectric machine is disclosed, particularly for a permanent magnet brushless DC motor wherein cogging torque is a problem. One or more apertures or "reluctance holes" are disposed within the head portion of the salient poles in the stator such that the reluctance holes are substantially adjacent but not adjoining the pole face, thereby forming a bridge between the aperture and the pole face. The reluctance hole bridge provides a substantially constant air gap flux density to reduce cogging, while at the same time, provides a low reluctance shunt path for the armature reaction flux around the permanent magnet to improve the demagnetization margin. The efficiency of the machine is also improved.

Abstract: A fine tracking miniature galvanometer actuator is used as a fine tracking positioner for a read/write head in the optical disk drive of an information storage and/or retrieval system. An efficient magnetic circuit is used in conjunction with a small and lightweight rotor design which offers high performance characteristics in terms of frequency response and sensitivity. No mechanical springs or torsion bars are necessary to maintain the rotor in a neutral or zero position. The present invention is also useful in other systems using electro-optical transducers including reflecting-type galvanometer recording systems used for producing variable-area sound tracks .

Abstract: The invention presents a novel magnetic bearing device of a simple design and construction, so that it can be attached to the ends of the driving shaft of a synchronous motor or a servomotor. The device consists of: a rotor having a number of permanent magnets, mounted on a central shaft where the central shaft is connected to a driving shaft of a rotating load of an external apparatus; and a stator surrounding the rotor with an airgap. The stator of the bearing device is provided with a number of electromagnets on the inner circumference which can be energized successively so as to create a rotating magnetic field constituted by opposing or attracting polarities to the field effect polarities created by the moving permanent magnets. An integration of the vertical force components over the inner circumference of the stator provides the total magnitude of the levitation force to support the external load.

Abstract: An axially compact rotational sensor adaptable to a drive axle for determining the rotational speed of the differential case which is the average speed of the wheels associated therewith. In a second embodiment dual rotational sensors are incorporated in the drive axle for determining the rotational speed of the differential and one axle shaft permitting calculation of the speed of both axle shafts.

Abstract: A DC brushless motor which includes a hollow cylindrical stator (2) having a plurality of exciting coils (6) secured to an inside thereof; a solid cylindrical rotor (7) provided within the stator and having at least two permanent magnets (30) therein so as to form a magnetic circuit with the stator; a rotary shaft (8) secured concentrically with said rotor; and a pair of bearings (10, 12) secured to opposite ends of the stator for supporting the rotary shaft for rotation. The permanent magnet is placed between a pair of high permeability yoke portions or pole pieces each extending in a radial direction to form a magnetic circuit and made of a rare earth element-transition metal-boron alloy.

Abstract: An electric machine includes an armature which has a permanent-magnetic excitation part of the machine and a stator which has an induction part of the machine. The induction part includes a first and a second region, each region equipped with current conductors. The armature and the stator are movable relative to each other. The machine includes an electronic commutator which has electronic components. An adjustment to purposefully change a voltage induced in the induction part during operation of the machine, by adjustment of the relative phase of the voltages induced in the two regions of the induction part is achievable due to the first region of the induction part being physically adjustable relative to the second region of the induction part in the direction of relative movement of the armature and the stator. In addition, a sensor is provided in the second region for detecting the instantaneous relative position of the armature and the stator.

Abstract: An adjustable speed drive system is provided which employs a unique induction machine which includes a rotor assembly mounted on a shaft, and associated cooperative first and second stators. The two stators are angularly adjustable, relative to each other, about the axis of the shaft. The net excitation of the rotor and thus the operating point of the machine on the torque-speed curve of a load on the shaft of the machine is a function of the relative angular displacement of the two stators. A third stator may be employed to enhance the efficiency of the machine by feeding excess rotor power back into the power line.

Abstract: An electrical motor has a ring with a plurality of stepped portions in at least one surface. There are plurality of C-shaped cores spaced along the ring, the C-shaped cores each having at least one surface provided with stepped portions which oppose the surface of the first member having the stepped portions. Each of the C-shaped cores has a permanent magnet and a ring providing a flux path joining the magnets.

Abstract: An inductance machine having a rotor assembly electromagnetically coupled to first and second synchronous magnetic fields. The first and second synchronous magnetic fields have a relative angular displacement about the rotor axis which may be adjusted.

Abstract: An a.c. generator having a stator including an armature core and a polyphase output winding wound around the armature core. A plurality of rotors mounted on a rotary shaft to establish a first and a second field magnetic circuits are arranged in parallel with respect to the armature core. The first field magnetic circuit includes permanent magnets acting as a source of exciting magnetomotive force, while the second field magnetic circuit includes a field winding acting as a source of exciting magnetomotive force. The magnetic fluxes generated from the first and second field magnetic circuits penetrate the armature core inducing an output voltage across the polyphase output winding. The magnetic flux from the second field magnetic circuit is changed so as to increase or decrease the total magnetic flux penetrating the armature core thereby controlling the induced output voltage.

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: In an AC generator having a plurality of claw-shaped magnetic pole portions in a rotor, a pair of projected portions which extend toward an outer circumference from both ends of boss portions on an outer circumference of a shaft are provided, and permanent magnets are also provided so as to abut against the projected portions so that magnetic flux is applied in the same direction as the magnetic flux applied to the projected portions when an electric current is applied to a field winding which is wound around the boss portions. With a magnetic path thus constructed, it is possible that the magnetic flux if permanent magnets is put on the magnetic flux produced by a field winding, thus applying much magnetic flux to the stator. As a result, the output per weight can be increased.

Abstract: A hybrid single-phase variable reluctance motor includes a stator with four inwardly salient teeth evenly spaced around a central core. A phase winding is operatively associated with two diametrically opposed stator teeth. Energization of the phase winding causes a temporary magnetization of those two teeth. A rotor disposed for rotation in the central bore has two outwardly salient teeth disposed generally at 180 degrees with respect to each other. A single permanent magnet is disposed adjacent the central bore at the end of one of the stator teeth other than the two having phase windings. A position sensor is disposed at the fourth stator tooth for detecting the rotational position of the rotor in the central bore. The position sensor is disposed in one quadrant of the motor in which the flux resulting from the permanent magnet and the flux resulting from the energization of the phase winding are in the same direction.

Abstract: A low noise brushless dc motor has a rotor with a permanent magnet and a stator with a bearing system mounting a shaft for rotating the rotor. The bearing system includes at least one axially extending bearing surface that terminates in axially spaced apart ends defining the outer axial limits of the bearing surface. Magnetic components of the rotor and the stator define a magnetic circuit. the magnetic components have an eccentricity creating an asymmetry in the magnetic circuit that causes a resultant lateral magnetic force to be applied on the shaft at a point axially inside the outer axial limits of the bearing surface, whereby the shaft exerts a pressure along the bearing surface between both ends of the bearing surface in a direction perpendicular to the rotor axis.

Abstract: A device which rotates an armature through a sequence of angular positions cyclically, using control of the current in a second stator winding while maximum current is applied to a first stator winding. The magnetic poles associated with the two windings are circumferentially offset from each other.

Abstract: A motor having flux-concentrating permanent magnets, the motor including a stator with windings and a rotor including a shaft, a sleeve surrounding the shaft for holding rotor laminations, and permanent magnets. The motor being characterized in that said sleeve is constituted by unitary sleeves (2) separated by disks (5), the sleeves and the disks being clamped together by tie bars (6) connected to at least one end cheek plate (7) which is fixed to the shaft (1).

Abstract: A variable reluctance motor (10, 100, 200) for providing holding torque in accordance with the invention includes a magnetically permeable rotor (12); a stator (18) axially aligned with the rotor having at least one phase winding (22) for producing a magnetic field causing the rotor to rotate; and a first cylindrical magnet (26) mounted coaxial with and outboard from a first side of the rotor which creates a permanent magnetic field coupling the rotor to the magnet to provide holding torque.

Abstract: A rotary electric machine comprising a stator and a rotor arranged opposedly of the stator. A magnet is provided on the stator or a frame for holding the stator at a position so as to be constantly opposed during rotation to a portion of the magnetic body of the rotor. The magnet is disposed at a position other than at a portion at which the magnetic action for rotation of the rotor occurs. The rotor is therefore constantly biased so that rotor play is minimized and non-repeatable deflections of the spindle are eliminated.

Abstract: A Wiegand-effect shaft position sensor is excited by an alternating magnetic field generated by stationary magnets or solenoids interacting with a high-strength, toothed wheel that is fixed to the rotor. A set of three stationary poles are situated proximate to the rotor and are connected together by a yoke. The magnets or solenoids are mounted in the outside poles of the set of three stationary poles. The central stationary pole contains a Wiegand-effect device. In operation, a flux reversal in the Wiegand-effect device occurs at twice the frequency at which the poles of the toothed wheel pass the stationary poles, resulting in the generation of sharp voltage pulses indicative of rotor position.

Abstract: The present invention discloses a same polarity induction generator comprising a casing, a stator composed of a plurality of magnetic poles spaced away at a predetermined mechanical angle, a rotary shaft, a rotor mounted on said rotary shaft and composed of two pairs of ferrite magnets each pair having one polarity located outwardly of a circumference of the rotor and the other polarity located inwardly of the circumference, the respective pairs being arranged so as to have different polarities on the outer circumference of the rotor, magnetic cores fixedly mounted on the casing, and coil wirings each wound around said respective magnetic cores so as to intersect magnetic fluxes formed among said ferrite magnets.

Abstract: A multiphase, synchronous, electrical machine with a permanent magnet incorporates a stator winding that is supplied with power through a static converter in such a way that, apart from the primary excitation field produced by the permanent magnets, there is an additional magnetic longitudinal field that is generated by the armature winding through which current flows, this additional longitudinal field being added to or subtracted from the primary excitation field in the longitudinal axis of the pole, and in which there are permanent magnets arranged within the winding-free rotor, as well as soft magnetic materials with intervening spaces of non-magnetic material which form loops that lie within each other and that are open towards the air gap, enclosing the air gap.

Abstract: An electrical multi-pole machine comprises a stator (1) having a soft-magnetic outer body (7) with permanent magnets comprising pole faces (9A-9D, 10A-10D, 11A-11D) arranged along a circular path, a rotor (3) which is coaxial with the stator and which comprises a soft-magnetic inner body (13) with teeth (15-22) comprising regularly spaced tooth surfaces (15A-22A) disposed along a circular path and which cooperate with the pole faces via an air gap (23), at least three active coils (29, 30, 31), and a machine shaft (5). The pole faces are arranged in groups, at least three groups (9, 10, 11) of magnets being provided, which groups are spaced from each other by coil slots (25, 26, 27) in which coil sides (29A, B, 30A, B, 31A, B) of the active coils are accommodated. Adjacent pole faces in each of said groups have opposite polarities.

Abstract: A force motor having four magnetic lanes arranged annularly around an axially movable central shaft, where the shaft is connected to an armature which also moves axially with the shaft within a gap located between two coils forming each lane of the motor. The four magnetic lanes are electrically and magnetically independent and provide three levels of safety-redundancy in case of coil failure.

Abstract: Electric multipolar machine, comprising a first machine part (1) with a magnetically soft outer element, a second machine part (3) arranged coaxially relative to the first machine part, with a magnetically soft inner element, provided with at least three teeth (17-19) and active coils (23, 24, 25), permanent magnets arranged in a circular path and ending in pole faces (31A1-A4, 31B1-B4, 31C1-C4), which mate with tooth faces (15A-H) across an air gap (35, 37), and a machine shaft (5), about which one of the abovementioned machine parts is rotatable relative to the other machine part. The outer element of the first machine part has at least one toothed magnetically soft disc-shaped plate (9, 11), which is provided with tooth faces distributed uniformly over the periphery of the plate.

Abstract: A brushless DC motor includes a rotor assembly and a stator assembly. The rotor assembly includes a plurality of rotor permanent magnets of a first polarity. The stator assembly includes a plurality of stator magnetic field assemblies facing the rotor assembly. Each stator magnetic field assembly includes a box-like magnetic core having an opening facing the rotor assembly. A permanent magnetic core is disposed within the box-like magnetic core having a surface facing the rotor assembly and possessing a second polarity at this surface. A field coil is wound in proximity to the box-like magnetic core for energizing the stator magnetic field assembly. A boosting permanent magnet is provided along an outer surface of the box-like magnetic core.

Abstract: A stepping motor includes stator coils on a stator sandwiched between a pair of covers, and a rotor shaft mounted for rotation on these covers and carrying a rotor composed of rotor yokes and rotor magnets. The rotor is rotated stepwise through a predetermined angle by drive signals supplied to the stator coils. The stator has stator magnets provided at an axially central position for cooperation with the rotor magnets, and the magnetic flux density in the gap between the stator and the rotor is increased by the stator magnets.

Abstract: A 1-phase energized disk-type brushless motor or fan motor comprises a single position detecting element located at a position on a printed circuit board corresponding to one of magnetically active conductor portions of one of stator coils of the stator armature. The magnetically active conductor portions include a width substantially equal to the width of each pole of the magnet rotor. A cogging generating magnetic member or plate having a width substantially equal to the pole width is located on the printed circuit board such that it is spaced by about three fourths of the pole width from one of the conductor portions of one of the stator coils so that the magnet rotor may stop with one pole thereof just opposed to the magnetic member, thereby assuring self-starting of the motor and uniform turning torque over the entire rotation of the motor.

Abstract: The present invention includes an electromagnetic motor having an asymmetric field stator. An aluminum rotor 6 includes a gorup 26 of permanent magnets that occupy a 153.degree. segment of the rotor 6 and are counterbalanced mechanically by brass counterweights 28 on the other side of the rotor 6. An aluminum stator housing 42 includes a large segment 48 of permanent magnets 54 separated by an electromagnet segment 50 from a small segment 52 of permanent magnets 54. The large segment 48 subtends an angle of 122.degree., the small segment 52 an angle of 22.degree.50' and the electromagnets 43.degree.. The permanent magnets 54 and electromagnets 56 and 58 of the staotr 42 produce a magnetic field that can have its center shifted from a first position or equator C by 32.degree.25' to a second position or second equator C'. As the rotor 6 spins the shifting of the center of the magnet field created by the stator 42 imparts momentum to the rotor 6 as it tries to align with the stator magnetic field.

Abstract: This alternator comprises an assembly of rotors (2), including a common shaft (3) on which are fixed a first rotor (4) having permanent magnets and a second, homopolar rotor (5), this assembly being disposed in a common stator whose power windings (7) surround the two rotors (4,5). An excitation coil (6) is disposed in confronting relation to the homopolar rotor and is supplied with direct current or alternating current as a function of the speed of rotation of the rotor assembly. In this way there is produced a magnetic flux which is added to that produced by the permanent magnets or is subtracted therefrom so as to maintain the output of the alternator constant.

Abstract: The electric motor includes a mover, which may be a rotor or actuator, and a stator having a number of poles projecting toward the mover. The poles have soft-magnetic teeth projecting toward the mover and extending transverse to the direction of mover movement, and the mover has soft-magnetic teeth projecting toward the stator teeth and extending transverse to the direction of mover movement. Windings energize the stator to move the mover. Dividing each pole transverse to the direction of mover movement to define two pole portions per pole, and locating permanent magnetic material between stator teeth in only one portion of each of the poles, enhances the motor torque while achieving a saving of permanent magnetic material. Preferably the magnetic material exists on alternate pole portions in successive poles.

Abstract: A linear pulse motor includes: a movable body having plural iron cores provided with coils, the iron cores extending along the moving direction of the movable body in parallel with each other and having plural magnetic poles arranged along the moving direction; a stationary body having magnetic circuit forming members for forming magnetic circuits with the iron cores across an air gap between the iron cores and the magnetic circuit forming members, the magnetic poles extending towards the magnetic circuit forming members; and a permanent magnet arranged such that magnetic fluxes therefrom interact with magnetic fluxes generated by energization of the coils, wherein the coils are so arranged and energized that magnetic forces are generated between one or more of the magnetic poles and the magnetic circuit forming members of the stationary body at both sides of the center of the movable body in the moving direction, the one or more of the magnetic poles being substantially at the same distance from the center,

Abstract: A full flux reversal variable reluctance machine is disclosed. The stator includes a plurality of poles and electrical windings surrounding a portion of the stator. The rotor comprises main and shunt components that have alternate sections of high and low magnetic permeability. The shunt and main components are magnetically isolated, and the sections of high and low magnetic permeability for one component are complementary to the sections on the other component. Variations in flux magnitude and direction are induced in the stator without reversing the flux direction in the rotor.