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| Number | Title | Issue Date |
| 7309939 | Current limiting means for a generator The invention provides means of limiting maximum current conducted through windings of an electric machine having a rotor and a stator. By encouraging an appropriate leakage flux around a winding, a leak impedance can be achieved which may be used, according to the ... | 12/18/2007 |
| 7270591 | Electric sander and motor control therefor A hand held orbital sander has a housing having an electronically commutated motor disposed therein and an orbit mechanism disposed beneath the housing. A motor controller is coupled to the motor. The motor controller changes the speed of at which it runs the motor ... | 09/18/2007 |
| 7190549 | Slim spindle motor and micro-drive apparatus comprising the same A slim spindle motor and a micro-drive apparatus including the slim spindle motor are provided. In the spindle motor, a hub is rotatably mounted on a base plate by ball bearings. The hub is used to seat a disk thereon. A ring-shaped magnet is engaged to the outer bo... | 03/13/2007 |
| 7034477 | Domestic electrical appliance including an electric motor Domestic electrical appliance, including a universal electric motor powered by direct current via an electrical circuit linked to a DC electrical voltage source, said circuit including a chopper arrangement, including a capacitor in parallel with the DC voltage sour... | 04/25/2006 |
| 6946768 | Pole winding pattern having parallel wound paths The winding (W1) comprises at least two poles and at least one phase, with which the poles are wound. The phase comprises at least two parallel-wired winding branches (1WA, 1WB, 1WC, 1WD). At least two of the winding branches (1... | 09/20/2005 |
| 6906490 | Starting of switched reluctance generators A switched reluctance drive is operated as a generator on a high voltage supply which has no long-term energy storage capability. A low voltage supply is used to start the generator through the use of a dedicated priming winding, which provides sufficient energy to ... | 06/14/2005 |
| 6777847 | Rotor core utilizing laminations having slots with dual direction skew portions Divided magnet rotors R having a stepped skew rather than a helical skew are described. The stepped skew enables the use of straight magnet sections (44) that can be inserted into the rotor core notches (38) thereby eliminating the need to produce a he... | 08/17/2004 |
| 6737783 | Sealed motor compressor A sealed motor compressor in which a motor running efficiency is largely enhanced with a single-phase bipolar constitution, an electromotive element is fixed to a sealed container, and formed of a stator provided with a stator winding, and a rotor which rotates in t... | 05/18/2004 |
| 6628034 | Brushless DC motor with armature windings compensated by auxiliary windings A brushless DC motor with armature windings is compensated by auxiliary windings wound around linking parts of each pair of adjacent teeth of the slotted stator, to increase the number of effective turns, thus improving the torque constant and efficiency ... | 09/30/2003 |
| 6232691 | DC electric starter-generator The present invention provides an improved DC electric starter-generator having high starting torque, compact size and weight, increased efficiency and reliability, and being particularly suitable for a starter-generator for aircraft engines but also suit... | 05/15/2001 |
| 6177746 | Low inductance electrical machine A low inductance electrical machine that may be used as an alternator or motor with low armature inductance is disclosed. Arrangements of complementary armature windings are presented in which the fluxes induced by currents in the armature windings effect... | 01/23/2001 |
| 6175178 | Low inductance electrical machine for flywheel energy storage A low inductance electrical machine which may be used as an alternator or motor with low armature inductance is disclosed. Arrangements of complementary armature windings are presented in which the fluxes induced by currents in the armature windings effec... | 01/16/2001 |
| 5994813 | Rotary electric machine A stator winding has a plurality of conductor members forming coil ends, and each of the conductor members of the coil ends is hardened and heat treated to have hardness which changes along the length of conductor members. Therefore, the stiffness of the ... | 11/30/1999 |
| 5959387 | Method for winding a field assembly for a universal motor and apparatus produced thereby A method for winding a field assembly for a universal motor and apparatus produced thereby is disclosed. The method involves winding both a field winding and a brake winding over different field poles within a field core simultaneously. After the first fi... | 09/28/1999 |
| 5783891 | Brushless synchronous machine A brushless synchronous machine, for example a synchronous generator, having an exciter, whose field excitation winding is powered via a regulator connected to a separate auxiliary winding in the stator of the main machine in which the auxiliary winding h... | 07/21/1998 |
| 5642010 | Rotor construction for alternating current induction motor The present invention pertains to an improved rotor bar design and method of fabrication of asynchronous motors using such rotor bars. The rotor bar design employs "T"-shaped rotor bars that are interleaved around a magnetic core forming a rotor having a ... | 06/24/1997 |
| 5402026 | Rotor for a short circuited alternating current motor A rotor for short-circuited alternating current motors, having a pack of circular rotor blades fixedly mounted on a shaft, the plates have, uniformly around the peripheral edges thereof, a number of recesses which, when the plates are packed, form general... | 03/28/1995 |
| 5294857 | Synchronous machine having control coils for compensating mechanical oscillations of the rotor In order to compensate for the effects of mechanical oscillations of the salient pole rotor in a synchronous machine in a simple manner, control coils are provided which generate a controllable quadrature-axis magnetic field. The control coils are arrange... | 03/15/1994 |
| 5063319 | Universal motor with secondary winding wound with the run field winding In a 2 pole universal motor for a circular saw a secondary winding provides dynamic braking. Both run and brake windings are split electrically with respect to the armature. All windings are double-ended and wiring and winding is arranged so that all wind... | 11/05/1991 |
| 4075543 | Method of determining the position and connection of multi-pole windings for multi-speed electric machines The invention relates to a novel method for determining the multipole windings of electric induction machines. This method is based on the operational modulation, which consists in modulating a 2p-pole basic winding by q sequences of complex operators (a | 02/21/1978 |
