Abstract: A stepper motor is provided in which a permanent ring magnet is sandwiched in an outer part of the stator winding assembly located far from the gap between rotor and stator teeth, so that magnetic flux in the gap is dominated by the Ampere-turns of energized stator coils and therefore more easily controlled for reduced vibration at low stepping speeds. The rotor need not contain any permanent disk magnet. If one is provided, it can be completely embedded within the rotor and merely supplement the primary flux from the stator to enhance torque. In most cases, where the rotor lacks any permanent magnet, the motor's axial shaft can have a larger diameter and may, together with the rotor, form a linear actuator.

Abstract: In precision mechanical actuators, wherein a high precision stepping motor can notably be used in the actuating mechanisms of artificial satellites, a stepping motor comprises two rotors that rotate in opposite directions to generate a low-amplitude movement between one of the rotors and a stator. The first rotor comprises a first set of teeth distributed at a first pitch p1 and a second set of teeth distributed at a second pitch p2. The stator comprises N stator contacts comprising a plurality a of teeth distributed at the pitch p1, distributed at a third pitch equal to p1(a+1/N), and able to cooperate with the teeth of the first set. The second rotor comprises N rotor contacts comprising a plurality b of teeth distributed at the pitch p2, distributed at a fourth pitch equal to p1(b+1/N), and able to cooperate with the teeth of the second set of the first rotor.

Abstract: This patent describes a three-phased reluctance motor (10) of stepper type with six coils placed in six slots (151-156) in a stator (5), n*6 teeth (7) in rotor (5) where n is an integer equal to or larger than 3, typically 8-16 and were the teeth (18) in stator (4) are shifted unsymmetrical so the motor (10) can produce torque at every angle between rotor (5) and stator (4).

Abstract: A system and method of manufacturing an electric machine comprising a rotor and a stator, wherein the stator comprises a fractional-slot concentrated winding having two sets of terminals, wherein a first set of terminals configures the fractional-slot concentrated winding to have a first pole-number (P1), and wherein a second set of terminals configures the fractional-slot concentrated winding to have a second pole number (P2) different from the first pole-number (P1).

Abstract: Disclosed herein is a switched reluctance motor including: a rotor part including a rotor core and rotor poles each formed to be protruded from the rotor core; and a stator part including a stator yoke rotatably receiving the rotor part therein and stator salient poles each formed to be protruded from the stator yoke so as to face the rotor poles, wherein a ratio of the number of stator salient poles to the number of rotor poles is (6×n+9):((6×n+9)+1) or (6×n+9):((6×n+9)?1), (n=0, 1, 2 . . . ), (where n=0, 1, 2 . . . ).

Abstract: A system and method of manufacturing an electric machine comprising a rotor and a stator, wherein the stator comprises a fractional-slot concentrated winding having two sets of terminals, wherein a first set of terminals configures the fractional-slot concentrated winding to have a first pole-number (P1), and wherein a second set of terminals configures the fractional-slot concentrated winding to have a second pole number (P2) different from the first pole-number (P1).

Abstract: A permanent-magnet rotary electric machine preferably includes a stator and a rotor opposed thereto via an air gap. The stator includes a stator core having 4m (m is an integer equal to or larger than 2) main poles each having inductor teeth at a tip thereof. The rotor includes two rotor units adjacent to each other in the axial direction. Each rotor unit includes a pair of rotor magnetic poles and a permanent magnet arranged therebetween. The permanent magnets in the rotor are axially magnetized in opposite directions to each other. Each rotor magnetic pole has magnetic teeth on its outer periphery at a regular pitch. The rotor magnetic poles in each rotor unit are arranged such that the magnetic teeth of one rotor magnetic plate are offset by half a pitch from those of the other rotor magnetic pole, and the magnetic teeth of adjacent rotor magnetic poles are aligned with each other in the axial direction.

Abstract: A motor and a control unit therefor comprise: salient rotor poles and salient stator poles, which are arranged along circumferences of phases A, B and C with an even interval therebetween; magnetic paths for passing magnetic fluxes, the paths permitting the magnetic fluxes passing through the salient rotor and stator poles of each phase to return to the rotor side; and substantially looped windings arranged between the salient stator poles of individual phases and the magnetic paths for passing magnetic fluxes, wherein currents are supplied to the windings in synchronization with the rotational position of the rotor to thereby output torque. Since the structures of the stator, the rotor and the windings are simple, productivity is enhanced, whereby high quality, small size and low cost can be realized.

Abstract: A system and method of manufacturing an electric machine comprising a rotor and a stator, wherein the stator comprises a fractional-slot concentrated winding having two sets of terminals, wherein a first set of terminals configures the fractional-slot concentrated winding to have a first pole-number (P1), and wherein a second set of terminals configures the fractional-slot concentrated winding to have a second pole number (P2) different from the first pole-number (P1).

Abstract: A switched reluctance machine (SRM) having a rotor and stator pole numerical relationship of S number of stator poles and R number of rotor poles, where R=2S?2, when S is greater than 4; provides improved power density, torque production, torque ripple, and is readily adaptable to existing hardware such as known controllers and the like.

Abstract: A rolling bearing, which includes a first bearing ring, a second bearing ring, an intermediate element, which can be a rolling body, or a cage for a rolling body, arranged movably between both bearing rings, and a reluctance stepper motor, which has a rotor and a stator. The stator is formed by at least one pole shoe, which is arranged between the two bearing rings and has magnetic field that can be electrically controlled. The intermediate element is designed as a rotor of the reluctance stepper motor.

Abstract: A rotary reluctance motor includes a set of inner disks each having an inner diameter root, an outer diameter free end, and a plurality of alternating high permeability teeth and low permeability material segments. A set of outer disks is interleaved with the inner disks to form a disk stack. Each outer disk has an outer diameter root, an inner diameter free end, and a plurality of alternating high permeability teeth and low permeability material segments. The inner and outer disks are configured to bear against and support each other in response to axial magnetic forces. Flux return portions are disposed axially adjacent the disks at each end of the disk stack. A coil is associated with the roots of one of the sets of disks and configured to provide axial flux through the disk stack to rotate one set of disks with respect to the other set of disks.

Abstract: A hybrid type stepper motor preferably includes a two-phase eight-main-pole stator and a rotor defined by two rotor units each having a pair of rotor magnetic poles with a permanent magnet interposed therebetween. Each rotor magnetic pole has fine teeth at a regular pitch. The permanent magnets are magnetized in opposite directions to each other. The adjacent rotor magnetic poles of the rotor units are arranged with their fine teeth aligned with each other in the axial direction. Each main pole has six inductor teeth including: a pair of innermost inductor teeth arranged at the first pitch in the central portion of the main pole; a pair of intermediate teeth on the outside of the innermost inductor teeth at the second pitch therefrom; and a pair of outermost inductor teeth on the outside of the intermediate inductor teeth at the third pitch therefrom. The first, second, and third pitches are all different from the pitch of the fine teeth of the rotor magnetic pole.

Abstract: Disclosed are single- and poly-phase transverse and/or commutated flux machines and components thereof, and methods of making and using the same. Exemplary devices, including polyphase devices, may variously be configured with an interior rotor and/or an interior stator. Other exemplary devices, including polyphase devices, may be configured in a slim, stacked, and/or nested configuration. Via use of such polyphase configurations, transverse and/or commutated flux machines can achieve improved performance, efficiency, and/or be sized or otherwise configured for various applications.

Abstract: A permanent-magnet rotary electric machine preferably includes a stator and a rotor opposed thereto via an air gap. The stator includes a stator core having 4m (m is an integer equal to or larger than 2) main poles each having inductor teeth at a tip thereof. The rotor includes two rotor units adjacent to each other in the axial direction. Each rotor unit includes a pair of rotor magnetic poles and a permanent magnet arranged therebetween. The permanent magnets in the rotor are axially magnetized in opposite directions to each other. Each rotor magnetic pole has magnetic teeth on its outer periphery at a regular pitch. The rotor magnetic poles in each rotor unit are arranged such that the magnetic teeth of one rotor magnetic plate are offset by half a pitch from those of the other rotor magnetic pole, and the magnetic teeth of adjacent rotor magnetic poles are aligned with each other in the axial direction.

Abstract: To realize reduction in vibration and noise while utilizing reluctance torque, a rotating electrical machine includes: a rotor having permanent magnets disposed in a cylindrical surface coaxial with a rotary shaft; and a stator having an annular stator core disposed coaxially with the rotary shaft, and a annular coil for magnetizing the stator core. The stator core has an annular part covering the annular coil, claws disposed at equal intervals in an inner radius surface of the annular part and extending axially, and magnetic gaps formed between neighboring claws. The number of claws is equal to the number of permanent magnets, and magnet flux in a direction orthogonal to a center axis of the magnetic pole of the permanent magnet at right angles in electric angle is larger than magnetic flux in the center axis direction generated between neighboring permanent magnets. Metal interpoles are provided between neighboring permanent magnets.

Abstract: A hybrid type stepper motor preferably includes a two-phase eight-main-pole stator and a rotor defined by two rotor units each having a pair of rotor magnetic poles with a permanent magnet interposed therebetween. Each rotor magnetic pole has fine teeth at a regular pitch. The permanent magnets are magnetized in opposite directions to each other. The adjacent rotor magnetic poles of the rotor units are arranged with their fine teeth aligned with each other in the axial direction. Each main pole has six inductor teeth including: a pair of innermost inductor teeth arranged at the first pitch in the central portion of the main pole; a pair of intermediate teeth on the outside of the innermost inductor teeth at the second pitch therefrom; and a pair of outermost inductor teeth on the outside of the intermediate inductor teeth at the third pitch therefrom. The first, second, and third pitches are all different from the pitch of the fine teeth of the rotor magnetic pole.

Abstract: A rotary reluctance motor includes a set of inner disks each having an inner diameter root, an outer diameter free end, and a plurality of alternating high permeability teeth and low permeability material segments. A set of outer disks is interleaved with the inner disks to form a disk stack. Each outer disk has an outer diameter root, an inner diameter free end, and a plurality of alternating high permeability teeth and low permeability material segments. The inner and outer disks are configured to bear against and support each other in response to axial magnetic forces. Flux return portions are disposed axially adjacent the disks at each end of the disk stack. A coil is associated with the roots of one of the sets of disks and configured to provide axial flux through the disk stack to rotate one set of disks with respect to the other set of disks.