| Patents for H02P 23 - Arrangements or methods for the control of ac-motors characterised by a control method other than vector control (5,487) |
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| 02/14/1990 | EP0354411A1 Suppression method for mechanical vibrations, superimposed on the actual speed value, and circuitry for carrying out the process |
| 02/13/1990 | US4901000 Variable rate stepper motor driver circuit and method |
| 01/30/1990 | US4897778 Motor control device |
| 01/17/1990 | CN1006513B Lift control apparatus |
| 01/10/1990 | EP0349924A2 A control means for a universal electric motor |
| 12/27/1989 | EP0347703A1 Motor controller |
| 12/27/1989 | EP0347702A1 Motor controller |
| 12/27/1989 | EP0347465A1 Method controlling servomotor |
| 12/27/1989 | CN1006265B Method of stepless speed control of a.c. motor and the motors |
| 12/21/1989 | DE3820562A1 Power supply source for a pulse-supplied electric motor |
| 12/20/1989 | EP0346488A1 Device for driving and controlling the spindle of a machine tool |
| 12/13/1989 | EP0345556A1 Counter circuitry for motor rotation speed control circuitry |
| 12/12/1989 | US4887307 Speed control apparatus for electric motor |
| 12/12/1989 | US4887015 Position control system |
| 12/05/1989 | US4885793 Digital servo system using microcomputer for controlling phase and speed of rotary body |
| 12/05/1989 | US4885515 Velocity control apparatus |
| 11/29/1989 | EP0183687B1 Electric rotating apparatus |
| 11/29/1989 | CN1005910B Control device for elevator |
| 11/14/1989 | US4880474 Method and apparatus for operating vacuum cleaner |
| 11/08/1989 | EP0340833A1 Method and device for accelerating test samples in an orbit, and use of the device |
| 11/08/1989 | EP0340480A1 Method to determine the speed of a machine |
| 11/07/1989 | US4879754 Speed controller |
| 11/07/1989 | US4879639 Power converter for driving an AC motor at a variable speed |
| 11/01/1989 | CN1036742A Method of and apparatus for accelerating reserved web |
| 10/25/1989 | EP0252948A4 Motor system. |
| 10/19/1989 | DE3911389A1 Servosystem fuer einen motor Servo system for a motor |
| 10/19/1989 | DE3910869A1 Control unit for gas turbines |
| 10/12/1989 | DE3905401A1 Verfahren und anordnung zum beschleunigen einer ersatz-wickelrolle Method and arrangement for accelerating a spare roll wrapper |
| 10/10/1989 | US4873473 Modular motor controller |
| 10/05/1989 | WO1989009511A1 Digital motor control system |
| 10/04/1989 | EP0335599A2 Inverter speed control unit |
| 10/04/1989 | CN1036110A Method and apparatus for controlling voltage type convertor by p.w.m. |
| 09/26/1989 | US4869610 Carriage control system for printer |
| 09/26/1989 | US4869347 Speed control apparatus for elevators |
| 09/12/1989 | US4866364 Power circuit for switching the number of poles on the rotor of synchronous machines by using rotative diodes |
| 09/05/1989 | US4864200 Motor speed control apparatus |
| 08/30/1989 | EP0329796A1 Servo motor controller |
| 08/24/1989 | WO1989007858A1 Motor output change-over control unit |
| 08/22/1989 | US4859917 Speed control device for an electric sewing machine |
| 08/17/1989 | DE3803119A1 Electronic rotation direction control device for an AC motor |
| 08/15/1989 | US4857814 Electronic motor controls, laundry machines including such controls and/or methods of operating such controls |
| 08/08/1989 | US4855661 Motion control apparatus for induction motor |
| 08/08/1989 | US4855654 Rotary body drive device |
| 07/27/1989 | WO1989006892A1 System for controlling servo motor |
| 07/26/1989 | EP0324806A1 Switch arrangement for controlling motors |
| 07/25/1989 | US4851754 Velocity control system |
| 07/25/1989 | US4851747 Non-precise heat control operation periodic positive & reverse circulating fan |
| 07/19/1989 | EP0324388A2 Speed control method and circuit of a rotor |
| 07/18/1989 | US4849871 Three-phase PWM inverter with speed control and load compensation for an induction motor |
| 07/05/1989 | EP0322460A1 Housing structure of amplifier unit for ac spindles |
| 07/04/1989 | US4845608 Digital speed controller using a single-chip microcontroller |
| 07/04/1989 | CA1256943A1 Apparatus for controlling a turbo generator |
| 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 | US4843297 Microprocessor speed controller |
| 06/21/1989 | EP0321124A2 Speed control means and apparatus for a repeatable material processing apparatus |
| 06/20/1989 | US4841206 Speed control device for an electronic sewing machine |
| 06/06/1989 | US4837486 DC motor speed stabilizing method and apparatus |
| 05/23/1989 | US4833586 PWM control for power converter system utilizing pulse dropping at minimum pulse widths |
| 05/23/1989 | US4833388 Method of and arrangement for controlling an asynchronous motor |
| 05/23/1989 | US4833375 Digital motor control system |
| 05/23/1989 | CA1254612A1 Induction motor control system |
| 05/18/1989 | DE3737951A1 Pivot-wheel drive |
| 05/16/1989 | US4831317 Method for controlling a servomotor |
| 05/10/1989 | EP0314812A1 Alternating current motor control system with emergency control. |
| 05/10/1989 | EP0314801A1 Power source regeneration circuit |
| 05/10/1989 | EP0314800A1 Device for controlling speed of servo motor |
| 05/03/1989 | EP0313671A1 Temperature compensative revolution speed control for an induction motor. |
| 05/02/1989 | US4827203 Rotor rotational position detector for a motor |
| 04/25/1989 | US4825133 Electromechanical actuator control system |
| 04/25/1989 | CA1253202A1 Microprocessor based motor speed control |
| 04/20/1989 | WO1989003611A1 Method controlling servomotor |
| 04/18/1989 | US4823067 Energy conserving electric induction motor control method and apparatus |
| 04/18/1989 | US4823060 Circuit arrangement for generating a measurement signal associated with the frequency of an alternating current signal |
| 04/18/1989 | US4823055 Electronic control circuit for command systems |
| 04/12/1989 | EP0310892A1 Slip measurement device for electric induction machine |
| 04/11/1989 | US4821168 Control system with improved robustness to disturbances |
| 04/04/1989 | US4818927 Acceleration/deceleration control apparatus using slip speed |
| 04/04/1989 | US4818923 Method of, and apparatus for, regulating the rotational speed of an electric motor in a four quadrant mode of operation |
| 03/29/1989 | EP0308517A1 Vaccum cleaner |
| 03/28/1989 | US4816734 Speed control system |
| 03/28/1989 | US4816723 Variable speed motor control method and apparatus |
| 03/21/1989 | US4814679 Motor speed control |
| 03/21/1989 | US4814678 Speed control apparatus for motor |
| 03/14/1989 | US4812730 Variable-speed generator/motor system |
| 03/09/1989 | WO1989002185A1 Servo motor controller |
| 02/28/1989 | US4808895 Acceleration control apparatus |
| 02/22/1989 | EP0303717A1 Drive control system for electric motor. |
| 02/21/1989 | US4806838 A.C. induction motor energy conserving power control method and apparatus |
| 02/14/1989 | US4804894 Motor rotation servo control apparatus |
| 02/09/1989 | DE3725398A1 Device for operating a three-phase asynchronous motor |
| 02/07/1989 | US4803568 Motor control apparatus effecting phase control on rotating body |
| 02/07/1989 | US4803409 Acceleration signal corrected motor speed control system |
| 01/31/1989 | US4801854 Adjustment and dialogue device more particularly for speed variators |
| 01/25/1989 | EP0300673A2 Closed loop control system |
| 01/24/1989 | US4800326 Apparatus and methods for controlling induction motors |
| 01/12/1989 | WO1989000307A1 Switch arrangement for controlling motors |
| 01/11/1989 | EP0298278A1 Power supply device connected by a junction cable to at least one electrical tool |
| 01/04/1989 | EP0297472A1 Drive circuit for motors |
| 01/03/1989 | US4795950 Phase controller for motor |