Abstract: A stepping motor having a rotor that includes a magnetic component whose circumferential part is magnetized in multipole along the circumferential surface thereof, the stepping motor being capable of forcing the rotor to rotate by magnetic force provided between magnetic poles of the rotor and excited salient poles of a stator, in which the magnetic component includes two magnetic component portions each shaped as an approximate ring, and the two magnetic component portions are either combined with each other or set up separately at an appropriate spacing between them. The stepping motor is capable of rotating with not only high speed but also less undesired vibration and noises, and enabling a simpler, smaller manufacturing equipment thereof to be constructed.

Abstract: An alternating current motor may include a rotor configured to rotate about a longitudinal axis, the rotor comprising a diametrically magnetized permanent magnet. Furthermore, the alternating current motor may include stationary coils having a magnetic axis substantially perpendicular to the rotor's longitudinal axis, the stationary coils adapted to the rotor's outer periphery and being substantially coaxial with the rotor's longitudinal axis. In addition, the alternating current motor may include a stator adapted to the stationary coils' outer periphery and being substantially coaxial with the rotor's longitudinal axis, wherein the diametrically magnetized permanent magnet is configured to cause the rotor's oscillation angle to vary no more than 30% between the rotor's oscillation angle at a beginning value of a frequency range of an alternating current in the stationary coil and the rotor's oscillation angle at an ending value of the frequency range of the alternating current in the stationary coil.

Abstract: A radial gap, transverse flux dynamoelectric machine comprises stator and rotor assemblies. The rotor assembly comprises at least two axially spaced, planar rotor layers having equal numbers of magnetic poles of alternating polarity disposed equiangularly about the rotor peripheral circumference. A magnetically permeable member optionally links adjacent rotor magnets. The stator assembly comprises a plurality of amorphous metal stator cores terminating in first and second polefaces. The cores are disposed equiangularly about the peripheral circumference of the stator assembly with their polefaces axially aligned. Respective first and second polefaces are in layers radially adjacent corresponding rotor layers. Stator windings encircle the stator cores. The device is operable at a high commutating frequency and may have a high pole count, providing high efficiency, torque, and power density, along with flexibility of design, ease of manufacture, and efficient use of magnetic materials.

Abstract: A radial gap, transverse flux dynamoelectric machine comprises stator and rotor assemblies. The rotor assembly comprises at least two axially spaced, planar rotor layers having equal numbers of discrete rotor magnets disposed equiangularly about the rotor peripheral circumference with alternating north and south poles. A magnetically permeable member optionally links adjacent rotor magnets. The stator assembly comprises a plurality of amorphous metal stator cores terminating in first and second polefaces. The cores are disposed equiangularly about the peripheral circumference of the stator assembly with their polefaces axially aligned. Respective first and second polefaces are in layers radially adjacent corresponding rotor layers. Stator windings encircle the stator cores. The device is operable at a high commutating frequency and may have a high pole count, providing high efficiency, torque, and power density, along with flexibility of design, ease of manufacture, and efficient use of magnetic materials.

Abstract: An electric motor, particularly an electronically commutated direct current motor, has a stator and a rotor. The stator and the rotor are arranged coaxially to a longitudinal axis of the electric motor. The stator features a plurality of electrical stator poles and a plurality of phase windings. The rotor features a permanent magnet with a least one magnetic pole pair which is dedicated to the phase windings. The phase windings and/or the permanent magnet are divided into several axial sections in the direction of the longitudinal axis of the electric motor and these sections are staggered around the longitudinal axis of the electric motor with respect to each other. Angular positions of the individual phases are offset with respect to each other is in such a way that torque ripple can be reduced and torque gaps can be prevented.

Abstract: A motor includes a cylindrical magnet, first outer magnetic pole portions which are formed by gapping part of a cylinder from the distal end in the axial direction of the motor, and which oppose the outer circumferential surface of the magnet, second outer magnetic pole portions which are formed by gapping part of a cylinder from the distal end in the axial direction, and which oppose the outer circumferential surface of the magnet, first inner magnetic pole portions opposing the inner circumferential surface of the magnet, second inner magnetic pole portions opposing the inner circumferential surface of the magnet, a first coil which is located at a position between the first outer magnetic pole portions and the first inner magnetic pole portions in the axial direction of the magnet, and which excites the first outer magnetic pole portions, a second coil which is located between the second outer magnetic pole portions and the second inner magnetic pole portions on the side opposite the first coil in the axia

Abstract: The present invention provides an electric rotary machine including a rotor having a field magnet provided on a shaft, the field magnet having magnetic poles of sequentially different polarities arranged in a rotational direction, a second field magnet with magnetic poles of sequentially different polarities arranged in a rotational direction wherein the second field magnet is rotatable on the shaft and displaced axially with respect to the first field magnet.

Abstract: A permanent-magnet rotating machine includes a rotor having a rotor core carrying on its curved outer surface multiple permanent magnets arranged in two rows along an axial direction in such a manner that the permanent magnets in one row are skewed from those in the other row in a circumferential direction by a row-to-row skew angle (electrical angle) &thgr;e, and a stator having a cylindrical stator core in which the rotor is disposed, the stator core being provided with stator coils for producing a rotating magnetic field for rotating the rotor. A lower limit of the row-to-row skew angle &thgr;e is set at a value larger than 30 degrees (electrical angle).

Abstract: A permanent magnet motor has rotor structure that includes magnetically permeable backing material attached to magnets for enhancing flux density distribution. A plurality of permanent magnets are circumferentially distributed about an axis of rotation, adjacent magnets successively alternating in magnetic polarity. The magnetically permeable material is configured with apertures therethrough at areas of low flux density, such as at central portions of the magnets, while in contact with perimeter areas of the magnets. Additional apertures in the material may be located at spaced intersections at which no significant flux density exists. The apertures may be replaced with backing material portions of reduced radial thickness.

Abstract: The present invention relates to a stepping motor.

Abstract: A rotary electric motor has a stator with a plurality of separate and ferromagnetically isolated electromagnet core segments disposed coaxially about an axis of rotation. The core segments are supported by a non-ferromagnetic structure. Each core segment has at least three poles aligned in a direction parallel to the axis. Windings are formed on portions linking the poles so that, when energized, the center pole forms a magnetic polarity opposite to the magnetic polarity of the other poles. The rotor comprises a plurality of axial rows of permanent magnets disposed circumferentially along the air gap. Each axial row of rotor magnets comprises a center permanent magnet of one magnetic polarity and, at each axial side thereof, a permanent magnet of a magnetic polarity opposite to the polarity of the center magnet.

Abstract: The device includes at least a roller unit having a fixed immovable shaft rod combined with two coiled stator units having silicon steel stators respectively wound with a coil. Each coil stator unit has its outer circumference covered by a tubular-shaped magnet rotor unit having magnet rotors fitted inside, with every two abutting magnets axially and biasly positioned. A combination unit composed of a bearing and a bearing outer cover is fixed respectively at two ends of the magnet rotor unit. The roller unit includes gaps between the magnet rotors and gaps between the magnet rotors and the silicon steel stator. When the coiled stator units are electrically connected, the magnet rotor unit will rotate around the coiled stator unit.

Abstract: In a rotary electric machine capable of improving the reliability of an object provided with the same, a permanent magnet type synchronous rotary electric machine comprises has a stator provided with windings. A rotor arranged supported for rotation in the stator with a gap between the inner surface of the stator and the outer surface thereof, is divided into two rotor bodies each provided with permanent magnets of opposite polarities alternately arranged in a circumferential direction. In switching the permanent magnet type synchronous rotary electric machine from a motor to a generator, a second rotor body is moved axially relative to a first rotor body to an axial position that makes the intensity of a combined magnetic field created by the permanent magnets lower than that of a combined magnetic field created by the permanent magnets when the second rotor body is located at a predetermined position, and then the second rotor body is moved to the predetermined position.

Abstract: A driving head for the numerically controlled setting movements of a tool spindle or workpiece table around at least one axis of rotation. The basic structure of the driving head comprises a housing (1, 1′) and at least one multi-pole external rotor motor (2) arranged concentrically in relation to the axis of rotation (A, B). The rotor motor is comprised of a ring-shaped, soft-magnetic stator (3) with single-pole windings, which is inserted in the housing (1, 1′); as well as a ring-shaped rotor yoke (5) fitted with permanent magnets (4) On the end side, the rotor yoke (5) is connected to a rotor body (6), which is rotatably supported in the housing (1, 1′). Furthermore, the rotor yoke is arranged between the stator (3) and a segment of the housing that comprises a device (7) for blocking the rotor yoke (5). The device (7) for blocking the rotor yoke preferably consists of a deformable diaphragm (8) acted upon by fluid and placed against the rotor yoke (5) under the pressure of the fluid.

Abstract: To provide a rotor for a motor capable of effecting improved torque variation due to improvement in the induced voltage waveform and of effecting improved magnet torque in a permanent magnet type synchronous motor utilizing reluctance torque. A rotor 11 comprises a core 12 made of a ferromagnetic material, a given member of permanent magnets 14 are mounted in the outer surface of the core 12 circumferentially at equal intervals, and arrangement of the permanent magnets 14 is such that polarities N, S of the permanent magnets on the sides facing a stator are disposed alternately. Also, in the core 12 between the center axis of the core and the permanent magnets 14 are embedded arc-shaped permanent magnets 16 corresponding to the permanent magnets 14, respectively, and arrangement of the permanent magnets 14 is the same as that of the corresponding permanent magnets 16.