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| Number | Title | Issue Date |
| 7425785 | Permanent magnet motor In a permanent magnet motor consisting of a rotor 1, which is supported on a rotating shaft 2 and has twelve permanent magnets 3 arranged at fixed intervals in the circumferential direction in the peripheral edge portion thereof, and a stator | 09/16/2008 |
| 7417347 | Skeleton type BLDC motor A rotor of a BLDC motor includes: a rotor divided into a north pole and a south pole on the basis of a magnetic pole separating line; and a stator at which the rotor is disposed with an air gap, the stator having a first pole shoe, a second pole shoe and a pair of d... | 08/26/2008 |
| 7355312 | Brushless Motor Small brushless motor having high output and small torque ripple. The brushless motor includes induction voltage adjusting means. With this, induction voltage of each phase of the stator is adjusted into a flatly spread waveform having no abrupt variation where odd-... | 04/08/2008 |
| 7321177 | Synchronous electric motor A synchronous electric motor including a rotor having a rotation axis, and a stator surrounding the rotor through a gap. The rotor includes a rotor core having an outer circumferential surface extending about the rotation axis and a plurality of permanent magnets at... | 01/22/2008 |
| 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 |
| 7183684 | Permanent magnet rotary motor A permanent magnet rotary motor that can maintain higher torque density and reduce cogging torque more greatly than a conventional permanent magnet rotary motor. A pair of end surfaces of each of permanent magnets used for a rotor are substantially parallel to a vir... | 02/27/2007 |
| 7109623 | Motor and electrically-driven fan employing the same An electrically-driven fan 1 comprises a base portion 2; a bearing portion 11; a stator 13 including iron core portions 15 and coils 16; a rotor 4 including a rotary shaft 20 and a cylindrical magnet 22;... | 09/19/2006 |
| 7078840 | Brushless rotary electric machine having tandem rotary cores A brushless rotary electric machine includes a stator having an annular armature core with first radial teeth at the outer periphery thereof and second radial teeth at the inner periphery thereof and an armature winding wound between the teeth, a rotor having a pair... | 07/18/2006 |
| 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 |
| 7057316 | Downhole torque generator A torque-generating apparatus includes a first assembly (10, 25) including a generally cylindrical member of magnetically soft material and having a longitudinal axis and a second assembly (2) arranged coaxially within the first assembly and including ... | 06/06/2006 |
| 7009319 | Controlling electric motor cogging A method of determining magnet pole geometry for controlling cogging in an electric motor includes defining the magnet pole geometry in terms of at least one design parameter, predicting cogging as a function of the design parameter, and from the predicted cogging, ... | 03/07/2006 |
| 6998748 | Motor rotor and manufacturing method thereof A motor rotor includes a magnetic yoke and a rubber magnet located within the magnetic yoke. At least one pattern is formed on a surface of the rubber magnet, which faces the magnetic yoke. The manufacturing method of the motor rotor is to provide a rubber magnet ha... | 02/14/2006 |
| 6977453 | Electric rotating machine provided with a field control coil In a rotating electric machine using permanent magnets and a field control coil, to allow the properties of the rotating electric machine to be readily changed and the rotating electric machine to be adapted to various applications even when it is made of common com... | 12/20/2005 |
| 6960847 | Electromagnetic actuator and composite electromagnetic actuator apparatus An electromagnetic actuator with high performance such as high speed and high resolution is inexpensively provided with solutions to problems associated with power supply and leakage flux, which have been involved in the structure of a moving coil type and have been... | 11/01/2005 |
| 6921999 | Electric motor An electromagnetic rotary actuator is driven by a single-phase voltage. Permanent magnets on a rotor interact over a part-cylindrical small airgap with a soft-iron stator having pole teeth that carry at least one winding for rotating the rotor within a limited angul... | 07/26/2005 |
| 6891296 | Magnetizing structure of motor The present invention provides a structure for magnetizing a rotor magnet of a motor, which includes a rotor having a magnet cylinder with a wavy curve surface and a stator having a plurality of silicon steel sheets wound by a plurality of winding coils. The present... | 05/10/2005 |
| 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 |
| 6867524 | Rotor skew methods for permanent magnet motors A permanent magnet motor to reduce torque ripple includes a rotor having at least three segments. Each of the three segments is formed sequentially adjacent and aligned along an axis of the rotor. Each segment has at least one pair of permanent magnets disposed at a... | 03/15/2005 |
| 6864616 | Method and apparatus for forming an electric motor having stacked laminations An electric motor including a stator, a rotor, and a housing adapted to support the stator and the rotor is provided. The stator includes a stator core, a first and second lamination stack, a flux tube extending therethrough, and windings on the stator core. The rot... | 03/08/2005 |
| 6858960 | Low cogging permanent magnet motor The present invention minimizes variations in torque due to cogging in a permanent magnet brushless electric motor and, among other things, specifies a topology of a rotor and a stator in relation to one another. According to one embodiment, a permanent magnetic mot... | 02/22/2005 |
| 6817507 | Capstan motor for magnetic recording and reproducing apparatus A capstan motor for a magnetic recording and reproducing apparatus includes a stator having a coil disposed on outer peripheral direction thereof, and a rotor having a magnet to correspond to coil and rotated by an electromagnetic interaction between the coil and th... | 11/16/2004 |
| 6774520 | Thin inner rotor motor and disk device using the motor An inner rotor motor includes a rotor which has a plurality of circumferentially arranged magnetic poles and a stator which is positioned outside a circumference of the rotor and has a stator core which includes a plurality of magnetic pole teeth which face the roto... | 08/10/2004 |
| 6759777 | Permanent magnet type electric rotating machine A permanent magnetic type electric rotating machine includes: a stator having armature winding arranged in several slots formed in a stator core; and a rotor having permanent magnets held in several permanent magnetic insertion holes formed in a rotor core, in which... | 07/06/2004 |
| 6759776 | Permanent magnet type electric rotating machine A permanent magnetic type electric rotating machine includes: a stator having armature winding arranged in several slots formed in a stator core; and a rotor having permanent magnets held in several permanent magnetic insertion holes formed in a rotor core, in which... | 07/06/2004 |
| 6756871 | Actuator with number of stator teeth equal to number of rotor poles An inexpensive, small, high-efficiency actuator having a single-phase claw pole structure permits easy assembly or winding and enables a rotor to act in a fixed direction by detent torque even in a deenergization mode. The actuator includes a stator yoke composed of... | 06/29/2004 |
| 6727630 | Rotary permanent magnet electric motor with varying air gap between interfacing stator and rotor elements A permanent magnet motor is configured with selective variation of the radial distance between an interfacing pair of rotor permanent magnet and stator pole along the circumferential length of the pair. The effects of cogging torque on the overall torque signature c... | 04/27/2004 |
| 6700280 | Drive unit with an electric machine A drive unit with a drive and an electric machine, the drive being equipped with a drive shaft and the electric machine with a stator and a rotor. The rotor is coaxial to the stator and connected to the drive shaft for the transmission of torque, where th... | 03/02/2004 |
| 6433453 | Revolving speed increasing apparatus A revolving speed increasing apparatus in which the repulsion of the magnets acts effectively only in the rotational direction to increase the revolving speed by the magnets. A rotary plate, fixed to a rotary shaft so as to integrally rotate, and a fixed ... | 08/13/2002 |
| 6140736 | Anti-loosening outer rotor means for high-torque outer-rotor type electric motor An anti-loosening outer rotor device, adapted for use in an outer-rotor type electric motor, includes: a cylinder member having a plurality of recesses radially recessed in an inside wall of the cylinder member; a magnetic conductor annularly secured to t... | 10/31/2000 |
| 6093984 | Rotor for electric motor A rotor for an electric motor includes a frame made of a resin and having a cylindrical yoke mounting portion, a base covering one end side of the yoke mounting portion, and a shaft supporting portion located at the center of rotation of the base, all of ... | 07/25/2000 |
| 6081058 | Motor structure having a permanent magnet motor with grooves to reduce torque ripples A motor structure in a salient pole type DC motor in which torque ripple and cogging torque are reduced, without deceasing motor efficiency, and the torque constant and irregularity of the rotation are reduced. The magnetic flux density distribution of an... | 06/27/2000 |
| 5925963 | Magnetic circuit structure for a DC electrical machine having high resistance to cross magnetic flux A low armature reacting magnetic circuit includes of an integral combination of magnetic circuit structures, one for each magnetic pole including at least the two main magnetic field poles of the machine, to achieve magnetic flux circuits of two or more p... | 07/20/1999 |
| 5753991 | Multiphase brushless AC electric machine The multiphase brushless AC electric machine comprises a stator frame having a surface provided with parallel slots and projections disposed alternately, each of the openings being substantially as wide as the widest width of the corresponding slot; and a... | 05/19/1998 |
| 5753990 | Means for producing rotary motion A device for converting magnetic force to mechanical force including a member having an axis about which it is rotatable, the member having a peripheral edge portion formed of a material that is effected by the presence of a magnetic force adjacent theret... | 05/19/1998 |
| 5736803 | Synchronous machine rotor A synchronous machine rotor has a progressive magnetic airgap and a constant aerodynamic airgap.... | 04/07/1998 |
| 5682072 | Three-phase brushless motor A three-phase brushless motor includes a rotary shaft, a rotor fixed to an outer surface of the rotary shaft, and a drive coil of three phases disposed around the rotor. An outer surface of the rotor is magnetized to have alternately and equidistantly arr... | 10/28/1997 |
| 5677583 | Electric motor having rotor with offset against stator A electric motor is capable of increased output torque and efficiency in utilizing magnetic energy. The electric motor includes a plurality of electromagnets arranged annularly, each of the electromagnets having a magnetically permeable armature and a win... | 10/14/1997 |
| 5485045 | Rotor for permanent magnet-excited, high-speed electric machines and electric machine equipped with this rotor The present invention pertains to a rotor for permanent magnet-excited electric machines, on the circumferential surface of which permanent magnets are arranged, and fillers made of a nonmagnetic material are arranged between them, wherein the surface of ... | 01/16/1996 |
| 5473209 | Permanent magnet braking system for drive shafts A braking system adapted to be used on the drive shaft of a vehicle has a rotor containing permanent magnets mounted on the shaft and preferably has a pair of non-rotary electroconductive plates separated by air gaps from the rotor on opposite sides there... | 12/05/1995 |
| 5463263 | Permanent magnet control means A motion producing device using permanent magnets as the source of energy including one or more permanent magnets at least one having a coil mounted on it, and an electric circuit for connecting the coil to a source of electric energy whereby application ... | 10/31/1995 |
