Abstract: The rotary machine is composed of the rotor having magnetic poles and the stator having the stator yoke portion constituting the iron core tooth portion wound by the stator winding and the flux flow path of the magnetic poles. The rotor is composed of a metallic material having ferromagnetic parts and non-magnetic parts as a member and has a magnetic barrier area composed of the slit portion for blocking the bypath magnetic path in the periphery of the rotor and the non-magnetic parts. The rotary machine that produced torque can be increased sufficiently and the mechanical strength during high-speed running is improved and an electrical vehicle using it.

Abstract: To provide a bearing assembly having an electric power generating capability, that can be assembled compact in size and easily incorporated in a drive transmission system of an internal combustion engine, the bearing assembly having an electric power generating capability includes a rolling bearing 1 including an outer race 7 and an inner race 6 rotatable relative to the outer race 7, and an electric power generator 2 interposed between the inner and outer races 6 and 7 for generating an electric power by a rotation of the inner race 6 relative to the outer race 7. This bearing assembly may be used as a bearing in the drive transmission system of the internal combustion engine for rotatably supporting, for example, a crankshaft 4.

Abstract: A TPSRM may include a stator, having a plurality of poles and a ferromagnetic or iron back material, and a rotor having a plurality of poles and a ferromagnetic or iron back material. A current flowing through coils wound around a first set of the plurality of stator poles induces a flux flow through the first set of stator poles and portions of the stator back material during a first excitation phase. A current flowing through coils wound around a second set of the plurality of stator poles induces a flux flow through the second set of stator poles and portions of the stator back material during a second excitation phase. The numbers of stator and rotor poles for this TPSRM are selected such that substantially no flux reversal occurs in any part of the stator back material as a result of transitioning between the first and second excitation phases.

Abstract: A double variable reluctance resolver in which a redundancy is given to a variable reluctance resolver to improve reliability. The double variable reluctance resolver also functions as a multiple speed resolver system.

Abstract: A segmented arc generator is adapted to convert mechanical power such as wind or water power into electrical power at a wide range of wind or shaft speeds. A rotor has a plurality of salient poles disposed about a periphery of a rotor ring. A stator has a stator ring disposed radially about and in close proximity to the rotor ring. The stator ring includes a plurality of stator coils wound on a ferromagnetic structure and having permanent magnets imbedded within the structure. Relative motion between a rotor pole and a corresponding stator coil induces a coil voltage across that coil. A phase controlled converter in electrical communication with the stator coils rectifies the output voltage. A pulse width modulated inverter is in electrical communication with the phase controlled converter for converting the D.C. voltage output by the phase controlled converter to an A.C. voltage of controlled amplitude and phase relationship determined with respect to a voltage waveform present on a connected utility grid.

Abstract: An electric motor is equipped with a rotor having multiple rows of slits arranged along a radial direction. A permanent magnet is buried only in some of the slits, namely the ones closest to the center of the rotor or the innermost slits, to drive the motor using both magnet torque and reluctance torque. This improves the torque output.

Abstract: A motor (1) has a stator (2) and a rotor (10) mounted for rotation in the stator. A commutating salient pole (11) of the stator as a winding (7), and a field-producing salient pole (12) has a winding (8). The rotor has at least two salient poles (10a,b). An outer back-iron (13) magnetically joins bases of said stator poles. An inner back-iron (14) extends from the field pole around the rotor to such an extent that a substantial amount of the magnetic field in the rotor between its poles is short-circuited by the inner back-iron, at least for a part of its rotation. An electrical circuit powers the windings to drivingly rotate the rotor.

Abstract: A linear pulse motor includes primary stators (1) in which a plurality of excitation units (3a -3d) and excitation coils (5a -5d) wound on the excitation coils are lined up in a row, and a secondary movable element (12) arranged at a predetermined gap from the stators (1) to face side surfaces of the stators (1). The stators (1) are arranged in a traveling direction of the movable element (12), and the stators (1) and the movable element (12) are supported to be movable relative to each other in the traveling direction of the movable element (12). A plurality of pole teeth (16) arranged on the movable element (12) are partitioned and integrally connected to each other by a nonmagnetic member (17). The secondary movable element is made lightweight and the response performance is improved.

Abstract: A switched reluctance electrical machine comprising a rotor 2 and coils 4 is arranged to provide constant power or torque output over a wider range of operational speeds. The coils 4 each include a tap T or a number of taps in order to allow the effective number of turns in each coil 4 to be altered dependent upon rotor 2 speed.

Abstract: A single phase induction motor and a compressor utilizing the single phase induction motor wherein the motor has a stator having a plurality of slots; a rotor being rotated by a magnetic field generated by an electric force between the stator and the rotor; and a main winding and a sub winding wound through the plurality of slots of the stator to form a revolving magnetic field of the rotor. The main winding and the sub winding form a centralized type of winding structure so that the main winding and the sub winding are wound in an alternate pattern via adjacent slots. Since the centralized winding structure of the main winding and the sub winding which are wound through the slots of the stator, the coil end is greatly reduced, and as a result, the material costs and copper loss can be greatly reduced. Further, the main winding and the sub winding, which are wound through the slots of the stator, do not protrude from opposite sides of the stator too much.

Abstract: The invention concerns a machine forming a motor or generator including a stator and a rotor. The rotor is a passive rotor, consisting of two ferromagnetic discs whereof at least one is toothed. The stator includes a fixed polyphase field coil arranged in an air gap defined by the space provided between the two discs and generating a rotating magnetic field, and a field coil likewise fixed. The invention is applicable to a cylindrical rotary machine or to a machine with linear displacement.

Abstract: An electrical motor or generator comprises a rotor 79 without windings, a stator 78 having armature windings comprising at least two coils A1, A2 having active portions positioned within armature winding slots 81 in a stator iron, and field windings F having active portions positioned within field winding slots 80 in the stator iron. An electronic control circuit is provided for controlling the currents in the coils A1, A2 in synchronism with rotation of the rotor such that periods in which a magnetomotive force is generated in one direction by current flow in one of the coils alternate with periods in which a magnetomotive force is generated in the opposite direction by current flow in another of the coils. The armature winding slots and the field winding slots are equal in number and alternate with one another in the stator iron.

Abstract: A motor for reducing torque ripple includes a shaft having a shaft axis, a rotor positioned about the shaft, a first magnet ring positioned on the rotor, the first magnet ring having magnets each occupying a magnet angle &dgr; on the rotor, and a second magnet ring positioned on the rotor, the second magnet ring having magnets each occupying a magnet angle &dgr; on the rotor, wherein the second magnet ring is shifted a non-zero number of degrees relative to the first magnet ring and wherein ends of each magnet within the second magnet ring are located at different angular positions than ends of each magnet within the first magnet ring relative to the shaft axis of the shaft. The magnet angle &dgr; is preferably an optimal magnet angle for minimizing cogging torque and line to line back emf harmonics.

Abstract: An invention is a new type of motor, a multi-circular flux motor. The invention has simple structure and comprises of a salient pole rotor and the silent pole stator. The stator pole is subdivided into plural teeth with the individual winding. A group of windings of each stator pole is connected in either series or parallel and is driven by one excitation phase. The movement of the invention uses multi-circular flux loops to produce reluctance torque to make the rotor moves. The multi-circular flux loops comprise of a series of flux loops that every flux loop is inversely rotation direction to each other adjacent. The invention can apply in a linear and rotating machine. By having plural winding poles and phases, the invention can be a poly-phase machine. The invention can be designed to be any number of poles and phases because all flux loops are separated. The invention is applied in both AC and DC machine and both linear and rotating machine.

Abstract: A vacuum cleaner assembly includes a motor having a rotor and a stator for providing motive power to the assembly. The rotor and stator each include armatures having tips. In one aspect, the widths of the rotor and stator tips are different. In another aspect, the rotor armatures have a non-constant width. Another aspect discloses the motor being a two-phase brushless motor having an even number (N) of stator armatures and N+2 rotor armatures. In another aspect, a rotor armature includes an aperture. In another aspect, each rotor armature includes a plurality of layers laminated together, with one layer being dimensionally different than the other layers. In another embodiment of the present invention, a control circuit energizes the windings of the stator so as to toggle the rotor in a first direction before alternately energizing the windings to drive the rotor in a second direction.

Abstract: A resolver-integrated motor has a radial irregular shape which is formed at an end on a non-load side of its motor shaft. This radial irregular shape is used as a resolver rotor. The radial irregular shape is formed by grinding or turning the motor shaft made of a carbon steel material in the same holding state as portions in which a bearing on a load side and a bearing on the non-load side are inserted. Accuracy of rotation center position of the resolver rotor to the motor shaft can be greatly improved, and detection accuracy does not require precise assembly of the resolver stator yoke to the motor bracket. The resolver stator yoke can be directly fixed to the motor bracket an intermediate part. A compact and inexpensive motor having a resolver is provided without sacrificing the accuracy of position detection.

Abstract: In order to improve the torque per weight ratio in electrical machines for a lower price it is proposed to use a segmented stator design. The segmented stator design is based on general E shaped cores traditionally used for single-phased transformers and inductors, The E-cores has a coil around the centred leg and is assembled parallel to the rotor axis, which means it will function with the transverse flux principle. A radial flux principle can also be performed with the E-cores if the E-cores are divided into two U-sections with a full pitch winding in between them. A clear extra advantage with the E-cores is short flux paths meaning less steel has to be magnetised. For a low volume production standard E-cores can be used making the investment in production facilities smaller. The E-core machines using the transverse principle can have different pole-shapes such the normal force between the rotor and stator are significantly reduced.

Abstract: An electric motor is equipped with a rotor having multiple rows of slits arranged along a radial direction. A permanent magnet is buried only in some of the slits, namely the ones closest to the center of the rotor or the innermost slits, to drive the motor using both magnet torque and reluctance torque. This improves the torque output.

Abstract: A rotor for a synchronous reluctance motor of flux barrier type and manufacturing method thereof constructs a rotor for a synchronous reluctance motor by forming a magnetic core steel plate of disc shape on which a shaft hole is formed at center part, and a plurality of flux barrier groups are formed centering around the shaft hole and automatic stacking points are formed; manufacturing a plate stacked body by stacking the core steel plates continuously using the automatic stacking points; disposing end plates on both sides of the plate stacked body; and coupling the end plates and the plate stacked body integrally with each other as inserting a coupling member into the flux barrier groups, whereby the manufacturing process can be made easy and automatic stacking of the core steel plates can be made regardless of the types such as a skew type or a non skew type, and therefore manufacturing cost is reduced and the rotor can be mass produced.

Abstract: A switched reluctance motor has a stator with a first set of poles directed toward levitating a rotor horizontally within the stator. A disc shaped portion of a hybrid rotor is affected by the change in flux relative to the current provided at these levitation poles. A processor senses the position of the rotor and changes the flux to move the rotor toward center of the stator. A second set of poles of the stator are utilized to impart torque upon a second portion of the rotor. These second set of poles are driven in a traditional switched reluctance manner by the processor.

Abstract: The invention provides a reluctance generator for an eddy current braking system in a vehicle. The reluctance generator has a field winding and a compensation winding, which induce magnetomotive forces. The magnetomotive force induced by the compensation winding balances the magnetomotive force generated by a rotor in the reluctance generator. The field winding has less inductance.

Abstract: A switched reluctance machine has a stator which has an array of alternate wide and narrow poles around its inner circumference. Coils are wound around the wide poles only. The rotor includes segments of soft magnetic material carried on a non-magnetic core. The segments are so proportioned at the air gap that the flux produced by one stator coil passes through two or more segments and returns through the adjacent narrow poles. The machine is capable of producing a high output.

Abstract: A multi-pole electric pulse generator contains poles having a pseudo-random distribution. Preferably, poles are equally sized and spaced, and polarity corresponds to a pseudo-noise binary sequence, which is specifically a primitive polynomial m-sequence. At one point in the rotor's revolution, all rotor poles are aligned with corresponding stator poles to provide maximum net magnetic flux through the armature windings. At all other rotor positions, the poles are misaligned so that the net flux through the armature windings is small. In operation, rotation through the misaligned rotor positions produces essentially no flux change so that no electric power is generated. When the rotor reaches the aligned position, there is a sudden, large flux change which generates a high-energy electric pulse. The exemplary application is for generating an ignition spark of an internal combustion engine.

Abstract: A superconducting PM machine has a stator, a rotor and a stationary excitation source without the need of a ferromagnetic frame which is cryogenically cooled for operation in the superconducting state. PM material is placed between poles on the rotor to prevent leakage or diffusion of secondary flux before reaching the main air gap, or to divert PM flux where it is desired to weaken flux in the main air gap. The PM material provides hop-along capability for the machine in the event of a fault condition.

Abstract: A reluctance motor with a stator (1) which has a three-phase current stator winding for generating a rotary magnetic field and a rotor (3) which is located on the shaft (2) and which is made primarily of a ferromagnetic material. The rotor is formed of a predetermined number of angular regions of the same peripheral angle which adjoin one another in a circumferential direction and preferably have at least one pair of flux guidance regions (10, 11) facing the stator (1), with flux guidance properties which differ in the main direction of the rotary field.

Abstract: A switched, brushless reluctance motor (10) has a radial flux stator (12), on whose radial flux poles (15 through 18) electrical radial flux coils (21 through 24) are situated for generating a radial magnetic flux (13) acting in the radial direction upon a rotatably mounted armature (11) having at least two armature poles (19, 20), a rotating motion being impartable to the armature (11) by applying a cyclically switched power to the radial flux coils (21 through 24); during said rotation the at least two armature poles (19, 20) are rotated in the direction of the radial flux poles (15, 17) which are magnetically excited at the time in order to shorten the particular radial magnetic flux path passing through the armature poles (19, 20).

Abstract: A homopolar generator includes a plurality of rotor elements arranged adjacent to one another on a single circumference of a circle around an axis of rotation for generating an electric current in at least one of the plurality of rotor elements when the plurality of rotor elements is rotated about the axis of rotation in a magnetic field that extends radially through the plurality of rotor elements relative to the axis of rotation. A first brush ring encircles the axis of rotation and is coupled to the at least one of the plurality of rotor elements. A second brush ring encircles the axis of rotation and is coupled to the at least one of the plurality of rotor elements wherein the second brush ring maintains continuous electrical contact with the first brush ring through the at least one of the plurality of rotor elements for all angles of rotation of the at least one of the plurality of rotor elements about the axis of rotation.

Abstract: The invention provides a reluctance generator for an eddy current braking system in a vehicle. The reluctance generator has a field winding and a compensation winding, which induce magnetomotive forces. The magnetomotive force induced by the compensation winding balances the magnetomotive force generated by a rotor in the reluctance generator. The field winding has less inductance.

Abstract: An electromechanical linear actuator that contains an electric servo motor mounted within a compact housing. A thermally conductive path of travel is provided to efficiently transfer heat out of the housing into the surrounding ambient. A further mechanism is provided for holding the stator windings of the motor in undisturbed contact with the inner wall of the housing when the motor is subjected to thermal stress. The motor is arranged to linearly position a push rod through means of a ball screw unit. The ball screw nut and the push rod ride on bearings within guideways to insure that the push rod tracks along a linear path of travel.

Abstract: The invention concerns a machine forming a motor or generator comprising a stator and a rotor, characterised in that the rotor (6) is a passive rotor, consisting of two ferromagnetic discs whereof at least one is toothed, and the stator comprises a fixed polyphase (P1,P2,P3) field coil (13) arranged in an air gap defined by the space (12) provided between the two discs (8,9) and generating a rotating magnetic field, and a field coil (14) likewise fixed. The invention is likewise applicable to a cylindrical rotary machine or to a machine with linear displacement.

Abstract: A brake includes a rotating element and a magnet wheel mounted on the rotating element so as to rotate with the rotating element about an axis of rotation. The magnet wheel has a first side extending transversely of the axis of rotation and facing the rotating element and a second side extending transversely of the axis of rotation and facing away from the rotating element. A first axial stop interacts with a first stop section located on the first side of the magnet wheel and a second axial stop interacts with a second stop section located on the second side of the magnet wheel for limiting an axial movement of the magnet wheel relative to the rotating element to a first predetermined amount. Along each line extending parallel to the axis of rotation and extending through the first or the second axial stop, the distance between the first stop section and the second stop section is smaller than the distance between the first axial stop and the second axial stop.

Abstract: A speed-sensing system for a differential assembly, wherein a tone ring positioned on the ring gear flange is eliminated and the speed-sensing equipment is specially placed in the form of a thrust washer and/or slinger with a tone sensing ring disposed between the yoke and the inner race of the pinion shaft to avoid bending distortions of the ring gear under various dynamic load conditions.

Abstract: A dynamo-electric machine includes: a stator having an iron core constructed by linking outer peripheral portions of a plurality of teeth arranged at equiangular pitches in a circumferential direction by an annular core back, and a plurality of coils wound around the teeth; and a rotor constructed by a plurality of magnetic poles composed of magnetic members arranged at equiangular pitches in the circumferential direction, the magnetic poles being formed into one piece by a base portion composed of a nonmagnetic member, and the rotor being rotatably disposed around an axis of the stator and adjacently to an inner periphery of the stator. The plurality of coils are composed of a plurality of first coils that are excited by alternating current and a plurality of second coils that are excited by direct current, each of the coils being wound around each of the teeth without involving any other teeth.

Abstract: A brushless electric machine comprising a housing fabricated from a magnetically permeable material and having an interior region, a stator mounted within the interior region and attached to the housing wherein the stator has a stator winding, a rotor mounted for rotation about

Abstract: A reluctance-type motor include a stator having a plurality of salient stator-poles, a rotor having a plurality of salient rotor-poles, a multi-phase coils mounted in the stator, and a driver circuit for driving said multi-phase coil. The driver circuit starts to supply drive current to the multi-phase coils when the salient rotor-poles and the salient stator-poles come across each other. In other words, the drive current is supplied to the multi-phase coils when the inductance thereof is zero.

Abstract: A resolver (20, 21) is provided with redundant excitation windings in which only a single excitation winding (E1) is energized externally. Cross coupling from the externally energized winding (E1) excites the other excitation winding (E2). A control circuit (27, 28) monitors the excitation of the redundant excitation winding (E2) and switches the excitation to the redundant excitation winding (E2) in the event of a failure of the externally winding (E1).

Abstract: An rotary electric machine 1 comprises stator 2 having a stator core 4 wounded with stator windings 5 and a rotor 3 having a rotor core 7 rotatable and opposite to the stator core 4 through a gap. The rotor core 4 of the roraty electric machine 1 is composed of a plurality of projecting pole magnetic core portions 73 arranged in a side of the gap and along the circumferential direction and a plurality of rotor yoke portions 76 for forming a magnetic path conducting magnetic fluxes of each of the projecting pole magnetic core portions 73, and the rotor core is divided in the circumferential direction on a unit of each of the projecting pole magnetic core portions 73 and each of the rotor yokes 76 opposite to each of the projecting pole magnetic core portions 73. It is possible to provide a rotary electric machine which is high in material use factor at manufacturing a rotor core and small in size and light in weight, and to provide an electric vehicle using the rotary electric machine.

Abstract: A reluctance-type motor comprises, for each of its rotor and stator, a core that has a cylindrical ring and a plurality of salient poles protruding from the ring in a radial direction of the ring. Each pole has a bottom width and a top width in a circumferential direction of the core at its bottom and at its top, respectively. The bottom width is sized to be larger than the top width, and the ring has a width sized to be larger than a half of the top width of the pole. The pole may be shaped to have a round corner at the bottom or in a trapezoid in which the bottom width is larger than the top width. The core may have a plurality of thin magnetic plates stacked in an axial direction of the core, each plate has a plurality slits in each protrusion which forms the pole, and each plate has a thickness which is less than 5 times of a maximum width of each slit.

Abstract: A controller for a switched reluctance machine utilizing a feedforward neural network in combination with either a fuzzy logic controller or a proportional-integral controller to provide output control signals (e.g., turn-ON angle, turn-OFF angle and peak current) for controlling the energization of a switched reluctance machine. In an alternate embodiment, a fuzzy logic controller is utilized by itself to control a switched reluctance machine.

Abstract: The present invention relates to a method and apparatus for reducing noise and vibration generated by a variable reluctance motor. The relative positions of paired opposing modules in each phase unit are adjusted relative to a stator, even after assembly of the motor, to reduce the noise and vibration.

Abstract: A generator or a 3-phase motor is arranged to provide multipolar permanent magnet excitation in combination with multipolar reluctance distribution wherein different numbers of poles are used for the permanent magnet excitation and for the reluctance distribution so that the principal working flux has a finite waveform. An annular rotor rotates about a cruciform stator. The magnets are buried in pole pieces of the stator so they converge radially inwardly with a triangular pole piece between them. Each pole piece is joined to the remainder of the stator by a bridge piece. The inner periphery of the rotor is formed as a circumferential array of teeth separated by recesses. The rotor may be within an annular stator or the machine may be linear.

Abstract: A reluctance type motor comprising a rotor (1), which has n units (n is an integer of 2 or more) of salient poles (1a, 1b).of the same widths and arranged at regular intervals, and a stator armature (16) including a polyphase magnetic poles (16a, 16b, 16c, . . . ) with armature coils (9a, 9b, 9c, . . . ) arranged confronting the outer periphery of the rotor (1). Two sets of adjacent magnetic poles (16a-16b, 16b-16c, . . . ) are successively excited to magnetically attract the salient poles (1a, 1b) so that all of the salient poles act to contribute to torque output without interruption.

Abstract: The invention relates to a motor comprising a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a single turn, and a rotor incorporating plural permanent magnets, which is rotated and driven by utilizing reluctance torque in addition to magnet torque. By turning thus divided teeth by a single winding, the occupation rate of the winding in the slots can be raised. As a result, a motor of small size and large output can be presented.

Abstract: This switched reluctance machine has at least six magnet yokes (11) on the stator side. The yokes are placed circularly and they carry windings (112). These yokes (11) can be placed at the inner side and/or the outer side of the rotor (12). These yokes which are magnetically insulated to each other interact with the salient poles (121) of the rotor (12). The two phases (X, Y) of this machine are push-pull controlled by a Hall sensor (31). This way the electronic circuitry becomes very simple.

Abstract: A reluctance motor is described in which stator coils are driven with sinusoidal, or substantially sinusoidal, waveforms. Preferably, the spread angle of the stator poles is less that the spread angle of the rotor poles. More preferably, the spread angles of the stator poles &thgr;S and the rotor poles &thgr;r are set such that &thgr;S is approximately equal to 2&pgr;/(m·Nr) and &thgr;r is about (&thgr;S+&pgr;/Nr)/2≦&thgr;r≦(&pgr;/Nr), respectively, wherein Nr is the number rotor poles and m is the number of phases of electric current. By supplying a sinusoidal, or substantially sinusoidal-like, driving waveform to the stator coils, torque becomes relatively constant and does not depend on the angular position of rotation of the rotor. Therefore, torque ripple is effectively decreased.

Abstract: To provide a reluctance type resolver which can reduce the influence by leakage magnetic flux and improve precision. A rotor 11, constructed from a magnetic material, includes magnetic salient sections opposing excitation teeth of a stator 31 and is fixed to an input axis 10, to be linked with the rotational motion of the input axis 10. Excitation teeth and bypass magnetic path teeth, both of which are constructed from a magnetic material, are provided on the inner periphery of the stator 31 with a predetermined spacing in between. Excitation windings are wound on the excitation teeth so that magnetic flux of the same direction with respect to the rotor 11 is generated at the excitation teeth.

Abstract: A roller is disposed rotatably on a roller shaft of a scooter, and has a housing which includes two housing halves that are interconnected to define an accommodation chamber therebetween. The housing halves define two shaft holes to permit extension of the roller shaft. A light-permeable rim element is sleeved fixedly on the housing. A light emitting unit is disposed within the rim element. An induction generator device is disposed within the accommodation chamber of the roller housing, and includes a mounting tube sleeved fixedly on the shaft, and a permanent magnet sleeved on the tube. A winding unit is disposed within the accommodating chamber, and includes a sheave and a coil unit that is wound on the sheave and that is in electrical connection with the light emitting unit. The sheave is sleeved rotatably on the magnet, and is fixed to the housing. Two ring-shaped conducting plates are mounted fixedly in the housing, and are in electrical and coaxial connection with the coil unit.

Abstract: This invention pertains to a rotor core (6) in which a plurality of core sheets (1) are laminated on one another on a rotor shaft (4). A plurality of slits (3, 7) and a plurality of strips (2) are alternately arranged in a radial direction of each of the core sheets (1) so as to convexly confront a center of each of the core sheets (1) such that an outer peripheral rim (10) is formed between an outer peripheral edge of each of the core sheets (1) and each of opposite ends of each of the slits (3, 7). A stress concentration portion (11) which is provided at a portion (10a) of the outer peripheral rim (10) and has a width (L1) larger than that of the remaining portions of the outer peripheral rim (10).

Abstract: A magnetic bearing apparatus for the journalling of a body (3), in particular of a rotor (3), comprises a stator (2) with a control winding (22) having at least three loops (22a, 22b, 22c) for the production of a magnetic control field by means of which the position of the body (3) relative to the stator (2) can be regulated, with each loop (22a, 22b, 22c) belonging to a different electrical phase, and a control device (4) which in a first operating mode supplies each loop (22a, 22b, 22c) with in each case a phase current (Ia, Ib, Ic) or in each case a phase voltage (Ua, Ub, Uc) as a control parameter. Means are provided in order to regulate the control parameter for each loop (22a, 22b, 22c) independently of the control parameter for the other loops (22a, 22b, 22c) as well as a monitoring unit (5) which can switch the bearing apparatus into a second operating mode in which a reduced number of phases, which is at least two, produces the magnetic control field.

Abstract: A motor with positive torque parking positions. The motor includes a rotor which is rotatable about an axis of rotation and a stator in magnetic coupling relation with the rotor. The stator includes a plurality of teeth each having a radially extending shaft and an axially extending face. The faces of the stator teeth define an aperture for receiving the rotor and the faces of the stator teeth and the rotor define a air gap therebetween. Each stator tooth has a notch in its face that is approximately at least as wide as the shaft of the stator tooth so that the stator has a magnetic configuration relative to the rotor for parking the rotor in a rest position corresponding to a positive torque starting position. The motor also includes a winding on the shafts of the stator teeth and a control circuit for controlling current in the winding whereby an electromagnetic field is produced for rotating the rotor at a desired speed or torque during the operation of the motor.