| Patents for H02K 21 - Synchronous motors having permanent magnet; Synchronous generators having permanent magnet (17,141) |
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| 02/21/1991 | DE3927454A1 Electromagnetically efficient machine with transverse flux path - has high density airgap flux, low magnetic leakage, fast commutation properties and superconducting potential |
| 02/21/1991 | DE3927453A1 Permanent magnet machine with high efficiency transverse flux path - has high density airgap flux, low leakage and convenient construction for cooling of superconducting materials |
| 02/20/1991 | EP0412993A1 Tape drive machines. |
| 02/13/1991 | EP0412340A1 Synchronmotor, preferably electronically commutated servomotor with permanent magnet excitation |
| 02/07/1991 | WO1991001584A1 Radial drive for implantable centrifugal cardiac assist pump |
| 02/06/1991 | EP0411563A1 Same polarity induction generator |
| 02/06/1991 | EP0411051A1 Electromagnetic shutter apparatus |
| 02/05/1991 | US4990806 Pulse motor |
| 01/30/1991 | EP0410293A1 Spindle motor |
| 01/30/1991 | CN2070512U Bicycle wheel axle generator |
| 01/30/1991 | CN1048957A Miniaturized electromagnetic monophase actuator |
| 01/23/1991 | CN2070056U New-type generator for lighting of the cycle |
| 01/22/1991 | US4987329 Motor magnet arrangement |
| 01/15/1991 | CA1279092C Magnetic structure for use in a chain saw or string trimmer ignition system or the like |
| 01/11/1991 | CA2020735A1 Radial drive for implantable centrifugal cardiac assist pump |
| 01/01/1991 | US4982128 Double air gap alternator |
| 12/27/1990 | WO1990016107A1 Compact monophase electromagnetic actuator |
| 12/27/1990 | EP0404299A1 Brushless motor |
| 12/26/1990 | CN2068295U Bicycle axle driven generator |
| 12/26/1990 | CN1048129A 同步机 Synchronous machine |
| 12/25/1990 | US4980608 Electric motor rotator for Christmas tree ornaments |
| 12/25/1990 | US4980595 Multiple magnetic paths machine |
| 12/25/1990 | US4980592 Flywheel magnet rotor assembly |
| 12/20/1990 | DE3915623C1 Permanent magnet electrical machine - has magnetic flow direction crossing direction of motor movement and permanent magnetic excitation |
| 12/18/1990 | US4978878 Electric multipolar machine |
| 12/12/1990 | EP0402179A1 An electric motor |
| 12/12/1990 | EP0401680A1 Current supply device for bicycles |
| 12/12/1990 | EP0243425B1 Current converter-fed synchronous machine with permanent magnet excitation |
| 12/05/1990 | CN2067044U Vehicle generator |
| 12/04/1990 | US4975608 Switched reluctance motor with full accommutation |
| 12/02/1990 | WO1990015467A1 Synchronous machine |
| 11/28/1990 | EP0226586B1 A synchronous servomotor |
| 11/28/1990 | CN2066636U Magnetogenerator |
| 11/27/1990 | US4973869 Brushless coreless DC motor |
| 11/27/1990 | US4973868 Electrical machine with permanent magnet excitation |
| 11/22/1990 | EP0397682A1 A rotating electrical machine. |
| 11/20/1990 | US4972112 Brushless DC motor |
| 11/14/1990 | EP0397143A1 Electronically commutated direct-current motor |
| 11/12/1990 | CA2015605A1 Electronically commutated dc motor |
| 11/01/1990 | WO1990009698A3 Revolving field motor excited by permanent magnets |
| 10/31/1990 | EP0394528A1 Synchronous machine |
| 10/31/1990 | EP0394527A1 Heteropolary excited synchronous machine |
| 10/23/1990 | US4965476 Stabilized disk drive spin motor |
| 10/17/1990 | CN2064130U Plane suspension motor and its controller |
| 10/17/1990 | CN2064129U Rare-earth permanent-magnetism synchronous motor |
| 10/10/1990 | EP0391791A1 Multi-phase synchronous machine with permanent magnets |
| 09/30/1990 | CA2013512A1 Circumferential motor |
| 09/25/1990 | US4959605 Hybrid permanent magnet and variable reluctance generator |
| 09/25/1990 | US4959577 Alternating current generator |
| 09/19/1990 | CN2062520U Permanent magnetic flying wheel generator |
| 09/18/1990 | US4958099 Brushless motor |
| 09/13/1990 | DE4004306A1 Permanent magnet generator incorporating magnetic shunt - has 2 magnetic cores mounted side by side with limbs forming closed magnetic yoke |
| 09/12/1990 | CN2062130U Outer rotary permanent magnet a.c. generator |
| 09/11/1990 | US4955128 Method for inserting rotor of electric motor |
| 09/11/1990 | CA1273981A1 Electric motor having rotor and stator provided with conical portions loosely fitted with each other |
| 09/11/1990 | CA1273980A1 Electrical machine with unequal pole faces |
| 09/05/1990 | EP0385203A1 Canned motor |
| 08/23/1990 | WO1990009698A2 Revolving field motor excited by permanent magnets |
| 08/23/1990 | WO1990009697A1 A permanent-magnet-excited electric motor |
| 08/23/1990 | DE3905013A1 Small electric motor |
| 08/22/1990 | EP0382867A1 Control device for the torque-constants of a permanent magnet excited tree-phase motor |
| 08/16/1990 | EP0382221A2 Light deflecting device |
| 08/16/1990 | DE3939081A1 Increased efficiency electric generator - uses magnet ring surrounding coil and having exchangeable rubber layer |
| 08/14/1990 | US4949002 Rotor for printed-wiring motor |
| 08/14/1990 | US4949000 D.C. motor |
| 08/14/1990 | US4948999 Self-starting two-pole single-phase synchronous motor |
| 08/09/1990 | WO1990009051A1 Under-the-hub disk drive spin motor |
| 08/09/1990 | DE4002714A1 Permanent magnet excited rotating field motor - has fractional slot winding and rotor with uniformly distributed even number of permanent magnets of alternating polarity |
| 08/08/1990 | EP0380744A1 Electric machine |
| 08/02/1990 | DE4001273A1 Small motor for tape recorder - has frequency generator with cylindrical section in contact with circumferential surface of housing to detect RPM |
| 07/31/1990 | US4945273 High efficiency electrical machine |
| 07/25/1990 | EP0378596A1 Two-phase or multiphase synchronous electric motor with disk-shaped rotor. |
| 07/24/1990 | US4943748 Motor with cup-shaped rotor having cylindrical portions of different diameter |
| 07/24/1990 | US4943747 Brushless unequal poles controlled electric motor |
| 07/18/1990 | EP0378162A1 Synchronous motor adapted to operate at constant power, and control for this motor |
| 07/17/1990 | US4942325 Electric motor |
| 07/17/1990 | CA1271802A1 Variable reluctance polyphase electric motor |
| 07/10/1990 | CA1271510A1 Brushless d.c. dynamoelectric machine with decreased magnitude of pulsations of air gap flux |
| 07/05/1990 | DE3844074A1 Synchronous machine |
| 07/04/1990 | EP0376530A2 Integrated electronically commutated motor and control circuit assembly |
| 07/03/1990 | US4939398 Laminated assemblies with in situ molded magnets |
| 06/28/1990 | WO1990007222A1 Magneto construction |
| 06/27/1990 | EP0375228A1 Electronically commutated motor and stationary assembly therefor with teeth faces having notches and having a skew between the slots and the permanent magnet field to reduce cogging |
| 06/27/1990 | CN1008582B Rotating electric motor |
| 06/20/1990 | EP0373987A1 Strong magnetic thrust force type actuator |
| 06/19/1990 | US4935656 High speed motor/generator for turbocharger |
| 06/13/1990 | CN2058285U Synchronous micromotor with coaxial gear reduction unit |
| 06/13/1990 | CN1008419B Rotating electric motor |
| 06/12/1990 | US4933585 High performance electric machine resistant to losses caused by the joule effect |
| 06/12/1990 | US4933584 Electronically commutated motor having skewed magnetics |
| 06/12/1990 | US4933581 Large air gap motor with rotor heat shield |
| 06/12/1990 | CA1270297A1 Regulatable permanent magnet alternator |
| 06/06/1990 | EP0260317B1 Lighting device for vehicle |
| 06/06/1990 | CN1008314B Synchronous a.c. motor |
| 05/29/1990 | CA1269693A1 Explosion-proof electrical generator system |
| 05/23/1990 | EP0368930A1 A motor or alternator. |
| 05/23/1990 | CN2057540U Butterfly type single-phase mini-generator |
| 05/17/1990 | WO1990005404A1 Electric generator for inducing current in the field coil |
| 05/08/1990 | US4924128 High-efficiency electric motor with low torque variation |
| 05/02/1990 | EP0365689A1 Synchronous motor |