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| Number | Title | Issue Date |
| 8084911 | Motor A motor including a stator and a rotor is disclosed. The rotor includes a first unit and a second unit. The first unit includes an N-pole first magnet and an S-pole second magnet. The first and the second magnets are alternately arranged along a circumferential dire... | 12/27/2011 |
| 7965008 | Servo motor and rotor thereof A servo motor, comprising a stator and a rotor disposed within the stator. The rotor has a core and magnets, covering the periphery of the core, forming a plurality of axially extending rotor poles. The rotor poles comprise a plurality of the magnets arranged axiall... | 06/21/2011 |
| 7906880 | Brushless motor with skewed rotor segments In a brushless motor including a rotor having 2n poles and a stator having 3n slots, segment magnets are arranged in three columns in the axial direction, thus constituting rotor poles. The segment magnets of adjacent columns, which are identical in po... | 03/15/2011 |
| 7439644 | Hybrid induction motor A hybrid induction motor comprises a stator fixedly installed in a casing, an induction rotor rotatably inserted into a center of the stator and having a shaft at a center thereof, a first synchronous rotor installed between the stator and the induction rotor in a c... | 10/21/2008 |
| 7348707 | Electromechanical device having three-dimensional stator laminations In certain embodiments, an electromechanical device includes a rotor having a rotational axis, and a stator disposed about the rotor. The stator may include a circumferentially laminated section comprising a plurality of circumferential segments disposed one after a... | 03/25/2008 |
| 7342338 | Permanent magnet electric motor with reduced cogging torque A permanent magnet electric motor 10 comprises a rotor 30 provided with two stages of permanent magnets in the axial direction on an outer circumferential face of a rotor iron core, and having a shaft shifted by a stage skew angle θr in electrical ang... | 03/11/2008 |
| 7336007 | System and method to control a rotary-linear actuator A system and method are disclosed for controlling an integrated rotary-linear actuator system that may be coupled to a network via a network interface. The integrated rotary-linear actuator system includes a control system and a rotary-linear actuator having a movea... | 02/26/2008 |
| 7301310 | Excitation controlled synchronous permanent magnet machine The present invention provides an apparatus and methods for providing constant voltage from a permanent magnet generator at varying prime mover speeds or under varying loads. A constant voltage permanent magnet generator includes a housing, a magnetized rotor, a pri... | 11/27/2007 |
| 7245054 | Permanent magnet electric machine having reduced cogging torque A permanent magnet electric machine includes a stator with salient stator poles. A rotor includes two or more axial rotor sections that are rotationally offset by an offset angle equal to the cogging angle divided by the number of axial rotor sections. The axial rot... | 07/17/2007 |
| 7218017 | System and method to control a rotary-linear actuator A system and method are disclosed for controlling an integrated rotary-linear actuator system that may be coupled to a network via a network interface. The integrated rotary-linear actuator system includes a control system and a rotary-linear actuator having a movea... | 05/15/2007 |
| 7190101 | Stator coil arrangement for an axial airgap electric device including low-loss materials A dynamoelectric, rotating electric machine includes a stator assembly that includes stacked stator coil windings. The machine is preferably a polyphase, axial airgap device. Improved slot filling results from the stacked stator coil configuration. Device performanc... | 03/13/2007 |
| 7157827 | Spoke permanent magnet rotor A spoke permanent magnet rotor that includes a shaft defining a rotor axis. A first non-magnetic end portion is coupled to the shaft and a ferromagnetic pole piece defines an aperture therethrough. A second non-magnetic end portion is positioned to dispose the pole ... | 01/02/2007 |
| 7071592 | Rotor for motor A rotor for motor is disclosed to have a plurality of protruding portions arranged in two rows around the periphery of the body thereof and spaced by magnetic gaps, and a plurality of magnets of semicircular cross section respectively covered on the protruding porti... | 07/04/2006 |
| 6958556 | Structure of rotors in stepping motors 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 mag... | 10/25/2005 |
| 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 |
| 6891287 | Alternating current axially oscillating motor 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 substant... | 05/10/2005 |
| 6800970 | Motor and optical apparatus using the same 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 ... | 10/05/2004 |
| 6771000 | Electric rotary machine and power generation systems using the same 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... | 08/03/2004 |
| 6713936 | Stepping motor The present invention relates to a stepping motor. The stepping motor includes a rotor having a cylindrical magnet with a plurality of N-S poles being radially magnetized thereto and a shaft having one end coupled to the center of the magnet and rotationally support... | 03/30/2004 |
| 6710502 | Rotary electric motor having at least three axially aligned stator poles and/or rotor poles 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 leas... | 03/23/2004 |
| 6710491 | Roller device with dynamic function 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 roto... | 03/23/2004 |
| 6669416 | Driving head for the numerically controlled setting movements of a tool spindle or workpiece table around at least one axis of rotation 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... | 12/30/2003 |
| 6664688 | Rotor for a motor 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 c... | 12/16/2003 |
| 6215206 | Rotary-linear actuator An actuator, with two independent degrees of freedom, rotates a stage about an axis and moves the stage along the axis, the range of motion defining a cylinder or cylindrical section. The stage is mounted on a hollow cylindrical plunger fitting in an annu... | 04/10/2001 |
| 6166473 | Dynamo-electric machine and generator and motor wherein the machine is used A rotary electric apparatus functions as either a generator or a motor and has a rotary shaft defining an axial direction and a stator disposed around an external periphery of the rotary shaft. The stator has coil assemblies including coils wound around c... | 12/26/2000 |
| 6105630 | Electrical rotating actuator for forming a weaving loom shed An electrical rotating apparatus for controlling a harness cord associated with the shed of a weaving loom which includes an actuator including a rotor and a stator. The rotor is formed of at least two permanent magnets which are mounted within a tube so ... | 08/22/2000 |
| 6104115 | Method for fabricating a permanent magnet rotor, and rotor obtained by said method In a method for fabricating a permanent magnet rotor for an electrical machine, a rotor support having an axis of rotation is provided. At least two poles are provided on the rotor support, each pole having at least one permanent magnet. A screen made ess... | 08/15/2000 |
| 6081053 | Motor A motor of an increased output is provided by forming a rotor, composed of a permanent magnet circumferentially divided into equal sections and alternately magnetized in different magnetic poles, in a cylindrical shape, positioning a first coil, the rotor... | 06/27/2000 |
| 6057622 | Direct control of air gap flux in permanent magnet machines A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34... | 05/02/2000 |
| 6034463 | Stator for an electric machine A process for fabricating a stator for an electric machine having a tubular unslotted ferromagnetic flux collector ring (16) and stator winding coils (18, 19, 20) with two legs which extend substantially axially along the inner cylindrical surface of the ... | 03/07/2000 |
| 5939813 | Gap tube motor The gap tube motor comprises a rotor, a stator and a gap tube which is arranged between the rotor and the stator, with at least two bearing apparatuses being arranged with a spacing in the axial direction (A) with respect to the rotor, and with at least o... | 08/17/1999 |
| 5923111 | Modular permanent-magnet electric motor A modular permanent-magnet electric motor assembly having a predetermined maximum power output for a submersible pump assembly, a stator having a plurality of electric coils adapted to be energized to create a magnetic field, and a rotor assembly disposed... | 07/13/1999 |
| 5892311 | Induction generator having a pair of magnetic poles of the same polarity opposed to each other with respect to a rotation shaft An induction generator having a pair of magnetic poles of the same polarity opposed to each other with respect to a rotation shaft is characterized by a high energy conversion efficiency. The induction generation has a rotation shaft driven by an external... | 04/06/1999 |
| 5874797 | Permanent magnet generator providing alternating current which has a selected frequency An electrical generator has at least one rotating ring of field magnets which produce a circular array of magnetic fields, and a ring of generator output coils which are in the magnetic fields. The field magnets are permanent magnets. The generator output... | 02/23/1999 |
| 5854521 | Multi-phase transverse magnetic flux machine A multi-phase transverse flux machine includes a primary component having individual bundles of lamination elements which are spaced at a mutual separation distance in a direction defined as the longitudinal direction of the transverse flux machine. Each ... | 12/29/1998 |
| 5777413 | Bearing installation in a floppy disk driver motor A bearing installation for a Floppy Disk Driver motor which is simple in structure and high in accuracy of a rotating action of a rotary shaft, thus hardly impairing the read and write characteristics of a Floppy Disk Driver device. A bearing installation... | 07/07/1998 |
| 5726517 | Magnetoelectric claw rotor, and a method of manufacturing such a rotor The invention relates to a magnetoelectric claw rotor of the type comprising parts made of magnetic material forming the poles of the rotor, and parts made of non-magnetic material for separating poles of opposite polarity, all confined in a common hollow... | 03/10/1998 |
| 5710474 | Brushless DC motor An improved, brushless, slot-less DC motor is disclosed which includes a plurality of ring shaped permanent rotor magnets affixed to the motor shaft and magnetized to have contiguous pole faces extending about the circumference thereof. A module plastic h... | 01/20/1998 |
| 5682073 | Hybrid excitation type permanent magnet synchronous motor A hybrid excitation type permanent magnet synchronous motor is provided with an armature and a rotor core arranged to be rotated relative to the armature. Permanent magnets are installed on the rotor core and generate magnetic flux which passes through th... | 10/28/1997 |
| 5594289 | Magnetic rotating apparatus On a rotor which is fixed to a rotatable rotating shaft, a plurality of permanent magnets are disposed along the direction of rotation such that the same magnetic pole type thereof face outward. In the same way, balancers are disposed on the rotor for bal... | 01/14/1997 |
