| Patents for H02K 21 - Synchronous motors having permanent magnet; Synchronous generators having permanent magnet (17,141) |
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| 10/02/1991 | CN1055088A 永久磁铁型同步电动机 Permanent magnet synchronous motors |
| 10/01/1991 | US5054009 Motor, in particular, for driving a clockwork |
| 10/01/1991 | US5053667 Di- or polyphase synchronous electric motor with a disc-shaped rotor |
| 10/01/1991 | US5053659 Centrifugal force magnetic field variator |
| 10/01/1991 | US5053656 Sensing ring for rotational sensing system |
| 09/26/1991 | DE4107962A1 AC generator for automobile - has permanent magnet rotor with axial and radial cooling |
| 09/24/1991 | US5051641 Transversal flow machine in accumulator arrangement |
| 09/24/1991 | US5051640 Heteropolar excited synchronous machine |
| 09/19/1991 | DE4107867A1 Alternator for motor vehicle current supply - has permanent magnet rotor and electromagnet motor for flux-voltage regulation |
| 09/18/1991 | EP0447257A2 Two-stator induction synchronous motor |
| 09/18/1991 | EP0298958B1 Brushless electric motor |
| 09/18/1991 | CN1054688A Energization coil device, method of making such device and electromagnetic micromotor fitted therewith |
| 09/17/1991 | WO1991014308A1 Low-profile disk drive motor |
| 09/17/1991 | CA2081375A1 Low-profile disk drive motor |
| 09/11/1991 | EP0445733A1 Spindle motor |
| 09/11/1991 | CN2084679U Petal type great coil winding disk motor |
| 09/10/1991 | US5047682 Permanent magnet excited electric motor |
| 09/10/1991 | US5047681 Constant power synchronous motor with microprocessor control |
| 09/10/1991 | US5047680 Rotating electrical machine |
| 09/10/1991 | US5047677 Aluminum disk motor having thermal compensation and magnetic sealing |
| 09/10/1991 | CA1288796C Permanent magnet assembly and method of making same |
| 09/04/1991 | EP0444539A1 Exciting coil set, method of fabricating the same and micromotor equipped therewith |
| 09/03/1991 | US5044897 Radial drive for implantable centrifugal cardiac assist pump |
| 09/03/1991 | CA1288461C Structure of a flat-type brushless dc motor |
| 08/28/1991 | EP0443403A1 Electromagnetic micro-motor for equipping a small clockwork-movement |
| 08/20/1991 | US5041749 High speed, high power, single phase brushless DC motor |
| 08/20/1991 | US5040285 Method of manufacturing a motor element of an electric motor |
| 08/14/1991 | EP0441376A2 Frequency generator |
| 08/14/1991 | CN1013537B High-speed motor generator |
| 08/13/1991 | WO1991012646A1 Lightweight high power electromotive device |
| 08/13/1991 | US5040085 Disk storage drive directed to disk drive details |
| 08/06/1991 | US5038240 Thin apparatus for etched on apparatus body recording medium with wiring pattern |
| 08/06/1991 | US5038065 Permanent magnet reversible synchronous motor |
| 08/02/1991 | WO1991011842A1 Stator for dynamoelectric machine |
| 08/02/1991 | CA2024384A1 Double air gap alternator |
| 07/23/1991 | US5034670 Control circuit for electromagnetic actuator |
| 07/23/1991 | US5034642 Permanent magnet rotor and motor |
| 07/23/1991 | US5033265 Coaxial hydraulic actuator system |
| 07/18/1991 | DE4001042A1 Bicycle dynamo with centrifugal force regulation - applied so that with increasing RPM air-gap is automatically widened to reduce effective flux |
| 07/18/1991 | DE4000592A1 Permanent magnet force converter producing electrical energy - moves permanent magnets by flywheel and linkage rod to induce current in coil wound on magnetic core |
| 07/17/1991 | EP0436721A1 Method of assembling a brushless motor |
| 07/16/1991 | US5031587 Internal combustion engine with integral stator and regulator |
| 07/11/1991 | WO1991010144A1 A variable reluctance sensor with multiple tooth coupling |
| 07/11/1991 | DE3943369A1 Encased medical gear pump - has pump wheel driven electromagnetically by stationary coil and rotating magnet on pump shaft |
| 07/10/1991 | EP0435906A1 Arrangement for generator windings, especially in ignition systems. |
| 07/09/1991 | US5030867 Same polarity induction generator |
| 07/09/1991 | US5030864 Three-phase electrical machine with reduced cogging torque |
| 06/27/1991 | WO1991009449A1 Slotless, brushless, large air-gap electric motor |
| 06/27/1991 | WO1991009223A1 An arrangement in generators for ignition systems generating voltages for control and charging |
| 06/26/1991 | EP0433649A1 Fluid metering pump |
| 06/26/1991 | CN1052578A High efficiency electric machine |
| 06/25/1991 | US5027026 Brushless motor |
| 06/20/1991 | DE3941271A1 Induction generator with periodically screened excitation magnet - incorporates rotor bridge for screening pole pieces of induction coil to prevent reversal of its polarity |
| 06/19/1991 | EP0433037A1 Spindle motor and disk drive provided therewith |
| 06/19/1991 | EP0432852A1 Starting device for a two-pole single-phase synchronous motor with permanent magnet rotor |
| 06/13/1991 | WO1991008608A1 High efficiency electrical machine |
| 06/13/1991 | DE3940487A1 Electric machine with continuously variable mechanical adjustment - provided by relative movement of rotor and stator in conical configuration causing variation of air gap |
| 06/12/1991 | EP0431178A1 Synchronous machine |
| 06/12/1991 | EP0431006A1 An electric motor. |
| 06/11/1991 | CA1284812C Reinforced rotor assembly and method of making same |
| 06/05/1991 | EP0429729A1 Electric machines with ironcore disk armatures |
| 06/05/1991 | EP0248798B1 Synchronous electric motor with magnetized rotor and method for fabricating said motor |
| 06/04/1991 | US5021698 Axial field electrical generator |
| 05/22/1991 | EP0428301A1 Integral stator and rectifier for internal combustion engines |
| 05/21/1991 | US5017822 Three-phase magneto armature |
| 05/15/1991 | CA2028742A1 Integral stator and rectifier for internal combustion engine |
| 05/14/1991 | US5015902 Multiphase synchronous permanent magnet electric machine |
| 05/14/1991 | US5015901 Rotor of a magnetmotive device |
| 05/14/1991 | US5015893 Motor structure with magnetic interference shield |
| 05/14/1991 | US5015159 Fuel pump |
| 05/07/1991 | US5013947 Low-profile disk drive motor |
| 05/07/1991 | US5013946 Miniature motor with a frequency generator |
| 05/02/1991 | WO1991006147A1 Improvement to electric motor of the brushless direct current motor type |
| 05/02/1991 | EP0425132A1 Alternating current generator |
| 04/24/1991 | CN1050956A 迈斯纳效应发电机 Meissner effect generator |
| 04/24/1991 | CN1050955A High-performance rare-earth permanent-magnetic synchronous motor |
| 04/23/1991 | US5010268 Electrical multi-pole machine |
| 04/23/1991 | US5009436 Magnetic fluid seal assembly |
| 04/17/1991 | CN2075399U Dermanent magnet rotor rectification type generator |
| 04/17/1991 | CN1050799A Electric generator with magnetic energy |
| 04/10/1991 | EP0421346A2 Method for producing an electric rotary machine such as a motor of DC brushless type |
| 04/10/1991 | EP0420885A1 Tacho generator |
| 04/10/1991 | CN2074950U Three-phase low-speed synchronous electric motor |
| 04/09/1991 | US5006943 Disk storage drive |
| 04/09/1991 | US5006745 Polyphase direct current motor |
| 04/09/1991 | US5006744 Integrated electronically commutated motor and control circuit assembly |
| 04/02/1991 | US5004944 Lightweight high power electromagnetic transducer |
| 04/02/1991 | US5003686 Method of manufacturing a synchronous electric motor with magnetized rotar |
| 03/27/1991 | CN2074076U Special purpose ignition generator of motorcycle |
| 03/27/1991 | CN2074075U Planar motor without silicon steel plate |
| 03/21/1991 | WO1991003855A1 Permanent magnet excited rotating electrical high speed machine |
| 03/19/1991 | US5001581 Disk storage drive |
| 03/19/1991 | US5000524 Motor-driven anti-lock brake system having auxiliary field winding |
| 03/14/1991 | DE3930050A1 Alternator for charging vehicle battery or powering lighting system - maintains constant output over wide range of speeds regulating from self-compensating stator-rotor flux control |
| 03/07/1991 | DE4027782A1 Electricity generator - having permanent magnetic discs, coil discs and opt. rotary discs with urethane] elements |
| 03/05/1991 | US4998034 Low speed high torque motor with production method |
| 03/05/1991 | US4998032 A brushless DC |
| 02/27/1991 | CN2072294U Permanent-magnet synchronous generator |
| 02/26/1991 | US4996613 Spindle motor with non-contact seal |
| 02/26/1991 | US4996457 Ultra-high speed permanent magnet axial gap alternator with multiple stators |