| Patents for H02P 25 - Arrangements or methods for the control of ac-motors characterised by the kind of ac-motor or by structural details (7,591) |
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| 04/04/1990 | EP0361834A2 Current source inverter control system for load cummutated induction motor drive |
| 04/04/1990 | EP0361786A2 Disk file digita servo control |
| 04/03/1990 | US4914644 Disk file digital servo control system with coil current modeling |
| 04/03/1990 | US4914371 Apparatus for controlling AC servo motor |
| 04/03/1990 | US4914327 Circuit arrangement for controlling the alternating current through a load |
| 03/28/1990 | EP0360499A2 Analog-to-digital converter |
| 03/13/1990 | US4908561 Servo amplifier circuit |
| 03/06/1990 | US4906911 Electrical machine driven by a pulse-controlled a.c. converter |
| 02/28/1990 | CN1007028B Method of controlling transducer arrangement |
| 02/27/1990 | US4905300 Motor control and power systems and methods of operation thereof |
| 02/07/1990 | EP0354095A1 Speed controlling chain of a washing-machine drum |
| 02/01/1990 | DE3832149C1 Method and device for switching over a three-phase drive |
| 01/25/1990 | WO1990000831A1 Motor drive system |
| 01/23/1990 | US4896089 Fault management system for a switched reluctance motor |
| 01/23/1990 | US4896088 Fault-tolerant switched reluctance machine |
| 01/17/1990 | EP0350716A2 Method for reduction of a current breakdown in a non-commuting phase belt of a three-phase block current supplied synchronous machine and circuit arrangement therefor |
| 01/16/1990 | US4894599 deadbeat control of disk drive actuator |
| 01/11/1990 | WO1990000325A1 Reluctance motor |
| 01/10/1990 | EP0349924A2 A control means for a universal electric motor |
| 01/10/1990 | EP0349923A2 A control means for a universal electric motor |
| 01/10/1990 | EP0349888A2 Apparatus having an automatic switch-on device for a parallel appliance at the time a main appliance is put into operation |
| 01/10/1990 | CN1038729A Method and apparatus for controlling carriage of linear motor |
| 12/28/1989 | WO1989012926A1 Coil winding structure of a.c. motor coil |
| 12/28/1989 | WO1989012562A1 Method and apparatus for controlling the carriage of a linear motor |
| 12/26/1989 | US4890181 Short-circuit protection device for an electrical machine fed by a pulse-controlled A.C. converter |
| 12/20/1989 | EP0346488A1 Device for driving and controlling the spindle of a machine tool |
| 12/19/1989 | US4888543 Drive arrangement, and motor-energizing system for use in the arrangement |
| 12/19/1989 | US4888513 Reluctance electric machine having a decreased cross section of rotor ferromagnetic material |
| 12/14/1989 | DE3819097A1 Circuit arrangement for supplying a reluctance motor |
| 12/13/1989 | EP0345539A1 Speed control circuit of a series-wound motor using torque braking |
| 12/12/1989 | US4887307 Speed control apparatus for electric motor |
| 12/05/1989 | US4885511 Drive control with overload protection for a drill device |
| 11/29/1989 | EP0343363A2 Motor control system |
| 11/29/1989 | EP0183687B1 Electric rotating apparatus |
| 11/23/1989 | EP0342452A1 One phase induction with a one strand winding |
| 11/22/1989 | CN1037435A Linear motor propulsion system |
| 11/16/1989 | WO1989011177A1 Single-phase induction motor with single-strand stator winding |
| 11/15/1989 | EP0342130A2 Servo amplifier circuit |
| 11/07/1989 | US4879503 Blower motor control for an air conditioner |
| 11/02/1989 | DE3813226A1 Motor mit einer selbstregelnden vorrichtung fuer die motorausgangsleistung Motor with a self-regulating device for the engine output |
| 10/31/1989 | US4878006 Multi-voltage motor and timer clock |
| 10/25/1989 | CN1036528A Method and system for controlling a machine tool such as a turning machine |
| 10/11/1989 | EP0336389A2 Method for controllably positioning a solenoid plunger |
| 10/04/1989 | EP0335650A2 Sampled servo motion control system |
| 09/27/1989 | EP0334112A1 Pulse converter driven induction machine |
| 09/20/1989 | EP0332974A1 Short circuit protection for a pulse converter powered electric machine operated both motorically and generatingly |
| 09/20/1989 | EP0332973A1 Pulse converter-operated electric machine |
| 09/19/1989 | US4868479 Low loss permanent magnet motor |
| 09/19/1989 | US4868478 Motor energizing circuit |
| 09/19/1989 | US4868477 Method and apparatus for controlling torque and torque ripple in a variable reluctance motor |
| 09/19/1989 | CA1259654A1 Control system for a power converter driving a synchronous motor |
| 09/19/1989 | CA1259653A1 Variable speed variable reluctance electrical machines |
| 09/13/1989 | EP0332200A2 Servo positioning apparatus |
| 09/12/1989 | US4866364 Power circuit for switching the number of poles on the rotor of synchronous machines by using rotative diodes |
| 09/08/1989 | WO1989008349A1 Two-state, bilateral, single-pole, double-throw, half-bridge power-switching apparatus and power supply means for such electronic power switching apparatus |
| 09/06/1989 | EP0331463A1 Improvements in electric machines |
| 08/30/1989 | EP0329926A1 Overload protection for electric motors |
| 08/29/1989 | US4862048 Speed control system |
| 08/24/1989 | WO1989007858A1 Motor output change-over control unit |
| 08/24/1989 | WO1989007789A1 Digital follow-up system |
| 08/23/1989 | EP0328972A2 Method and system for controlling a machine tool such as turning machine |
| 08/22/1989 | US4859917 Speed control device for an electric sewing machine |
| 08/17/1989 | DE3803821A1 Oscillating-armature motor with amplitude monitoring |
| 08/17/1989 | DE3803119A1 Electronic rotation direction control device for an AC motor |
| 08/10/1989 | WO1989007364A1 Speed controller |
| 08/08/1989 | US4855652 Speed control apparatus for a brushless direct current motor |
| 08/02/1989 | EP0326333A2 Variable speed ac drive |
| 08/01/1989 | US4853569 Noise suppression circuit for capacitor motors |
| 08/01/1989 | CA1258090A1 Servomotor control systems |
| 07/25/1989 | US4851751 Pulse width modulation power supply for loads such as artificial horizon indicator gyros and the like |
| 07/18/1989 | US4849651 Two-state, bilateral, single-pole, double-throw, half-bridge power-switching apparatus and power supply means for such electronic power switching apparatus |
| 06/29/1989 | WO1989006067A1 Device for driving and controlling the spindle of a machine tool |
| 06/29/1989 | WO1989006065A1 Device for switching connection of a three-phase induction motor |
| 06/27/1989 | CA1256488A1 Brushless exciter for controlling excitation of a synchronous machine |
| 06/21/1989 | EP0320560A1 Motor device for driving of vehicles and industriel machines |
| 06/20/1989 | US4841213 Current and torque feedback system and circuitry for sine-wave controlled brushless servo drive systems |
| 06/20/1989 | US4841206 Speed control device for an electronic sewing machine |
| 06/20/1989 | US4841188 Speed changing device for electric fans |
| 06/07/1989 | EP0318484A1 System for using synchronous secondaries of a linear motor to biaxially draw plastic films. |
| 05/31/1989 | EP0211011B1 Circuit for regulating the rotational speed of a series motor |
| 05/30/1989 | US4835408 Power conversion circuit |
| 05/23/1989 | US4833389 Current source inverter control system for load commutated induction motor drive |
| 05/16/1989 | US4831471 System for positioning a magnetic head at a center line of a floppy disk track |
| 05/11/1989 | DE3836647A1 Control device |
| 05/11/1989 | DE3836625A1 Control device |
| 05/11/1989 | DE3737406A1 Control device |
| 05/10/1989 | EP0315273A1 Circuit arrangement for controlling alternating current by a load |
| 05/10/1989 | EP0314793A1 Rectifier type electric drive |
| 05/03/1989 | EP0313929A1 Method to avoid current drop in a strand, not involved in commutation of a three phase synchronous machine with current block supply and circuit to execute the method |
| 05/03/1989 | EP0313870A1 Current phase angle control circuit for motors of electrical tools |
| 05/02/1989 | US4827203 Rotor rotational position detector for a motor |
| 05/02/1989 | US4827200 Velocity control unit of detecting head |
| 04/25/1989 | US4825111 Linear motor propulsion system |
| 04/25/1989 | CA1253202A1 Microprocessor based motor speed control |
| 04/18/1989 | US4823057 Variable speed motor control |
| 04/18/1989 | US4823054 Circuit for phase section control of an AC-DC motor |
| 04/13/1989 | DE3733293A1 Motor controller |
| 04/12/1989 | EP0311031A2 A method and an electric circuit for controlling an AC-motor, and a circulation pump driven by a motor controlled in this manner |
| 04/11/1989 | CA1252507A1 Control system of an ac motor |
| 03/29/1989 | EP0308621A2 Power system stabilizer |