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| Number | Title | Issue Date |
| 7321176 | Multi pole electrical machine with reduced cogging force A multi pole electrical machine includes an armature and a stator. The armature is movable in a direction of armature motion with regard to said stator and includes armature pole pairs. These armature pole pairs follow each other in the direction of armature motion.... | 01/22/2008 |
| 7119507 | Brushless DC motor and brushless DC motor controller A brushless DC motor has a stator and a rotor. An angle θ0 between an edge section of the flux barrier on a magnetic pole center side and an edge section on a side for coming in contact with the rib of adjacent flux barrier, with respect to the rotor cen... | 10/10/2006 |
| 7042126 | Rotary electric machine A rotary electric machine is disclosed having stator windings and a rotor incorporating permanent magnets distributed about the axis of the rotor to create a magnetic field having circumferentially alternating north and south poles. In the invention, the principal s... | 05/09/2006 |
| 6979918 | Actuator An actuator according to the present invention includes: a rotor that includes a magnet that has a cylindrical shape, and an outer peripheral surface alternately magnetized into different poles in a peripheral direction, and a soft magnetic member that is fixed to a... | 12/27/2005 |
| 6891295 | Flywheel magneto generator A flywheel magneto generator which comprises a rotor having a magnet attached to an outer circumferential side of a flywheel and a stator constructed by winding a generating coil around a core having a magnetic pole portion opposed to a magnetic pole of the rotor, w... | 05/10/2005 |
| 6841902 | Method and apparatus for minimization of magnetic bias force harmonics in a spindle motor A spindle motor is provided, which includes a stationary sleeve supported from a base, rotating shaft disposed through the sleeve, a fluid dynamic bearing between the sleeve and the shaft, a hub supported proximate a first end of the shaft, a stator supported from t... | 01/11/2005 |
| 6376958 | Permanent magnet type synchronous motor and air compressor Provided are a super-high speed permanent magnet type synchronous motor which causes less loss in a rotor even though it is driven by an inverter adapted to be operated with a fundamental frequency around 1 kHz, and an air compressor. The air compressor h... | 04/23/2002 |
| 5973431 | Reluctance machine with permanent magnet rotor excitations A reluctance machine system including a reluctance machine having a stator including at least one phase winding and a rotor defining rotor poles and inter-pole gaps, where permanent magnet inserts are positioned within the inter-pole gaps to interact with... | 10/26/1999 |
| 5760520 | Motor A motor has a stator and a rotor that is formed of two rotor parts fitted on a rotor shaft in a fashion preventing the rotor from rotating relative to the rotor shaft. The rotor parts carry permanent magnets arranged with a fixed pitch angle over their ou... | 06/02/1998 |
| 5670836 | Variable reluctance start permanent magnet motor A single-phase permanent magnet motor (10). A stator assembly (12) includes a stator (14) having a central bore (and a plurality of salient poles (18a-18d) extending into the bore. A rotor (13) is positioned within the bore and is rotatable relative to th... | 09/23/1997 |
| 5631512 | Synchronous motor having magnetic poles of permanent magnet and magnetic poles of a soft magnetic material Hard magnetic poles made of a permanent magnet and soft magnetic poles are alternately disposed on the periphery of a cylindrical rotor of a permanent magnet type synchronous motor. The arcuate length of the hard magnetic poles is equal to that of the int... | 05/20/1997 |
| 5038065 | Permanent magnet reversible synchronous motor A rotor of a permanent magnet type synchronous motor facing a stator having a number of slots comprises a rotor core fixed to a motor shaft and an even number of permanent magnets in a circumferential direction of the rotor core. Projecting portions are f... | 08/06/1991 |
| 4777397 | Permanent magnet generator apparatus including a consequent pole rotor A permanent magnet generator has a laminated rotor mounted to the driven shaft of a power alternator. The rotor is cylindrical and includes 10 circumferentially distributed elongated axial slots and 10 rotor teeth. Iron-boron-neodymium rare earth magnets ... | 10/11/1988 |
| 4758756 | Vernier-type electrodynamic machine The invention provides a machine based on a known type of vernier electrodynamic machine comprising two parts separated from one another by an air gap arranged along a surface, said parts being movable relative to one another in one direction of said surf... | 07/19/1988 |
| 4748360 | Rotor for a synchronous motor A rotor for a synchronous motor, having a plurality of first magnetic poles formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke fixed to a rotatable motor... | 05/31/1988 |
| 4691132 | Synchronous motor with two-pole permanent-magnet soft-magnetic-core rotor Single phase synchronous motor with a two-pole permanent-magnet rotor (5), coils (9) designed for nominal operation and a stator iron (7) which carries the coils (9) to produce a two-pole stator field between the stator poles (13). The rotor elements (19,... | 09/01/1987 |
| 4661736 | Rotor for a synchronous motor A rotor for a synchronous motor, having a plurality of first magnetic poles (19) formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke (18) fixed to a rotat... | 04/28/1987 |
