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| Number | Title | Issue Date |
| 8134273 | Electrical machine with skew-running magnet pole boundaries According to the invention, the torque ripple of electrical machines is supposed to be further reduced. For this purpose, it is provided to dispose the magnetic poles, for example, on the surface of a rotor in a plurality of sections (A1, A2) at differ... | 03/13/2012 |
| 7928622 | Brushless motor with skewed rotor segments In a brushless motor including a rotor having 2n magnetic poles and a stator having 3n slots, the magnetic poles of the rotor are composed of segment magnets arranged in three columns extending in an axial direction. The magnets of each column are displaced from the... | 04/19/2011 |
| 7902709 | Brush-less motor and electric power steering device having brush-less motor A permanent magnet included in a rotor of a brush-less motor is a radial anisotropic magnet in which multi-poles are magnetized in the circumferential direction and is skew magnetized along the axial direction in such a manner that a surface to one end part of an up... | 03/08/2011 |
| 7876013 | Brushless motor A brushless motor has rotor cores dividedly formed as plural sections in an axial direction, segment magnets secured to outer circumferential surfaces of the rotor cores, and magnet holders secured to the rotor cores, respectively, for holding the segment magnet. Ea... | 01/25/2011 |
| 7859159 | Electric motor An electric motor having a stator and a mover is disclosed. The stator has excitation coils of three phases, and the mover is movable relative to the stator. The mover has an opposed surface facing the excitation coils. Field poles or protrusions are provided on the... | 12/28/2010 |
| 7569961 | Rotor for motors The present invention provides a rotor for motors, in which motor torque is kept high and generation of torque ripples is reduced, and what is more, detecting accuracy of a magnetic pole position is not deteriorated. The present invention provides a rotor assembly h... | 08/04/2009 |
| 7541710 | Rotating electric machine Provided is a rotating electric machine which can restrain vibration and noise induced by a radial electromagnetic force of the rotating electric machine, and in which a rotor is divided into first to fourth four rotating pieces having axial lengths of 0.29L, 0.71L,... | 06/02/2009 |
| 7518277 | Electric motor The vibration and noise excited by the electromagnetic exciting force in the radial direction of an electric motor are suppressed. In an electric motor 100, a rotor 1 is divided into four rotor pieces 3, 4, 5, and 6 for an axial le... | 04/14/2009 |
| 7443061 | Driving device A driving device which is capable of delivering higher power and can be reduced in size. A hollow-cylindrical magnet (1) is magnetized so as to have circumferentially alternately different poles. First and second coils (2 and 3) are arranged con... | 10/28/2008 |
| 7397159 | Rotary electric apparatus with skew arrangement A rotary electric apparatus comprises a rotor including a first and second rotor members, a stator including a first stator and second stator members with armature coils to which armature current is supplied for synchronous rotation. The first and second rotor membe... | 07/08/2008 |
| 7364174 | Magnetic motor axle for skateboards A magnetic motor axle for magnetically augmenting the propulsion efficiency and duration of a skateboard is disclosed. The magnetic motor axle includes a truck for mounting on a step board of a skateboard. Multiple truck magnets are provided in the truck. An elongat... | 04/29/2008 |
| 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 |
| 7332845 | Spoke permanent magnet rotor A rotor includes a shalt that defines a rotor axis, a first end portion coupled to the shaft, and a pole piece that defines an enclosed aperture therethrough. A second end portion is positioned to dispose the pole piece between the first end portion and the second e... | 02/19/2008 |
| 7327062 | Rotor for rotary electric machine A rotor (10) for a rotary electric machine (1) comprises a rotation shaft (11), and a plurality of rotor cores (120-129) fixed to the rotation shaft (11) and axially split. The rotor cores (120-129) have outer ... | 02/05/2008 |
| 7307366 | Brushless permanent magnet machine with axial modules of rotor magnetization skew and method of producing the same An electrical machine having a machine output rating. The electrical machine including a shaft rotatable about an electrical machine axis, a rotor coupled to the shaft and rotating with the shaft, and a stator including a stator core. The rotor is configurable to in... | 12/11/2007 |
| 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 |
| 7247964 | Electrical machine with magnetized rotor An electrical machine comprises a stator and a rotor. The rotor is adapted to magnetically interact with the stator to promote rotation of the rotor about an axis. The rotor includes a rotor core and a plurality of magnetized arcs supported by the rotor core. The pl... | 07/24/2007 |
| 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 |
| 7208908 | Apparatus and method to control torque and voltage of an AC machine A method of controlling a power converter (258) of a synchronous machine drive system (100) determines position and speed of a rotor (350) of the synchronous machine (300); regulates a current vector relative to a reference frame, having ... | 04/24/2007 |
| 7202585 | Brushless motor A brushless motor is capable of increasing output torque while suppressing an increase in iron loss. A plurality of magnets are magnetized in reverse radial orientation in such a manner that magnetic fields directed toward a stator converge toward the stator, and ea... | 04/10/2007 |
| 7196445 | Permanent-magnet rotating machine A permanent-magnet rotating machine includes a rotor having a rotor core carrying on a curved outer surface multiple permanent magnets arranged in two rows along an axial direction. The permanent magnets in one row are skewed from those in the other row in a circumf... | 03/27/2007 |
| 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 |
| 7183687 | Brushless permanent magnet machine with reduced cogging and torque ripple and method of producing the same An electrical machine including a rotor rotatable about an axis and a stator adapted to magnetically interact with the rotor. The stator including (t) teeth and one or more windings with compact coils disposed around the teeth. The one or more windings having (m) ph... | 02/27/2007 |
| 7173352 | Stepping motor A stepping motor includes a magnet ring 1 whose outer peripheral surface is circumferentially divided to form radial protrusions and recesses and whose outer peripheral surface consists of a cylindrical permanent magnet magnetized to the same polarity, first ... | 02/06/2007 |
| 7170209 | Rotor for reluctance type rotating machine A rotor for a reluctance type rotating machine includes a rotor core formed by stacking a number of annular core materials each of which includes magnetic concave and convex portions. The rotor core has two keys which are formed at two positions on an inner circumfe... | 01/30/2007 |
| 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 |
| 7148598 | Spoke permanent magnet rotors for electrical machines and methods of manufacturing same A rotor assembly for an electric motor includes a spoke permanent magnet rotor and a shaft connected thereto. The spoke permanent magnet rotor has an axis of rotation, permanent magnet material, and ferro-magnetic material. The permanent magnet material extends outw... | 12/12/2006 |
| 7143503 | Brushless permanent magnet machine with axial modules of rotor magnetization skew and method of producing the same An electrical machine having a machine output rating. The electrical machine including a shaft rotatable about an electrical machine axis, a rotor coupled to the shaft and rotating with the shaft, and a stator including a stator core. The rotor is configurable to in... | 12/05/2006 |
| 7135800 | Axial gap electronic motor An axial gap electronic motor includes a stator having a plurality of poles, and a rotor. Each pole is formed of a stator iron core made of a magnet body and a coil wound therearound. The rotor has a plurality of poles formed of permanent magnet and arranged along a... | 11/14/2006 |
| 7084540 | Magnet motor and method of assembly A magnet motor with rotor assembly is provided that has a plurality of magnet members that circumscribe a wall of the rotor core or stator in an orientation that minimizes or eliminates gaps therebetween. The magnet members can have non-parallel opposing sides to al... | 08/01/2006 |
| 7081696 | Polyphasic multi-coil generator A polyphasie multi-coil generator includes a drive shaft, at least first and second rotors rigidly mounted on the drive shaft so as to simultaneously synchronously rotate with rotation of the drive shaft, and at least one stator sandwiched between the first and seco... | 07/25/2006 |
| 7075265 | High phase order electrical rotating machine with distributed windings A rotating induction machine, containing five or more different phases, having windings distributed according to a sinc function with a cutoff frequency allowing low-order spatial harmonics but preventing higher order spatial harmonics from flowing. In a preferred e... | 07/11/2006 |
| 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 |
| 7067948 | Permanent-magnet rotating machine A permanent-magnet rotating machine includes a rotor having a rotor core carrying on a curved outer surface multiple permanent magnets arranged in two rows along an axial direction. The permanent magnets in one row are skewed from those in the other row in a circumf... | 06/27/2006 |
| 7057322 | Rotor for reluctance type rotating machine A rotor for a reluctance type rotating machine includes a rotor core formed by stacking a number of annular core materials each of which includes magnetic concave and convex portions alternately formed on an outer circumference thereof and a central through hole, th... | 06/06/2006 |
| 7053587 | Apparatus for controlling three-phase AC motor on two-phase modulation technique An apparatus is provided to control a three-phase AC motor and comprises an inverter and a controller. The inverter powers the motor in response to a three-phase PWM command. The control circuit controls the inverter based on two modulation techniques selectively sw... | 05/30/2006 |
| 7049723 | DC motor The disclosure describes a DC motor including a rotor unit arranged within the motor body and has a cylindrical field magnet fixed to an outer surface of a holder. The holder has a rotating shaft press-fitted through the center, and the cylindrical field magnet has ... | 05/23/2006 |
| 7034424 | Permanent magnetic rotating machine A permanent magnet rotating machine includes a rotor with a permanent magnet having circumferential magnetic poles with a skew at boundaries between magnetic poles of the permanent magnet, and a stator having a stator iron core in an almost cylindrical shape and con... | 04/25/2006 |
| 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 |
| 7002277 | Motor and motor manufacturing apparatus Flat rolled magnetic steel sheets and strip or a die is turned in the press forming process. Rotor cores are stacked with turning through an angle which is an odd number multiple of about (360°/(number of slots in the motor×natural number n×2)) and stator cores a... | 02/21/2006 |
