| 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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| 12/03/1991 | US5070420 Magnetic disk drive |
| 12/03/1991 | US5070291 Connection switching apparatus for three-phase induction motor |
| 11/28/1991 | DE4016836A1 Safety system for asynchronous motor drive - monitors wide range of operating and function parameters to allow rapid detection of abnormality |
| 11/27/1991 | EP0458052A1 Regulator for an electric motor |
| 11/26/1991 | US5068777 Pulse width modulation type inverter having temperature compensation |
| 11/26/1991 | US5068587 Spindle drive control apparatus for a machine tool |
| 11/21/1991 | EP0456828A1 Drive control method for variable reluctance type motor |
| 11/19/1991 | CA1292272C Current source inverter control system for load commutated induction motor drive |
| 11/13/1991 | EP0456239A1 Method for electroless changeover switching of supply-segments of long stator motors supplied through a frequency converter |
| 11/13/1991 | EP0455869A2 Circuit arrangement for driving a centrifuge |
| 11/13/1991 | EP0455632A1 Linear motor propulsion system. |
| 11/13/1991 | EP0285637B1 A motor energizing circuit |
| 11/07/1991 | DE4014448A1 Capacitor motor speed preselection circuit for centrifugal drive |
| 11/06/1991 | EP0455578A2 Hybrid single-phase variable reluctance motor |
| 10/24/1991 | DE4012561A1 Electronically-controlled electric motor - uses induced current in stator control poles for switching motor winding current |
| 10/17/1991 | WO1991015894A1 Device for driving variable reluctance motor |
| 10/02/1991 | DE4010376A1 Ring spinner spindle drive - has three phase synchronous motor with permanently energised rotor for control through switches |
| 10/02/1991 | DE4010139A1 Connection of starting capacitor for starting single phase motor - using switch with magnet coil connected to voltage of operating capacitor |
| 09/17/1991 | US5049801 Dual speed controller for attic ventilator |
| 09/17/1991 | US5049800 Motor output changeover control apparatus |
| 09/11/1991 | EP0446058A2 Constant current reluctance motor drive systems |
| 09/04/1991 | EP0444203A1 Three-phase reluctance motor |
| 09/04/1991 | EP0444198A1 Reluctance type motor |
| 09/04/1991 | CN1054296A Operation control circuit for pump motor |
| 09/03/1991 | US5045766 Excitation device for electromagnetic actuator |
| 09/03/1991 | CA1288467C Load commutated inverter and synchronous motor drive embodying the same |
| 09/03/1991 | CA1288466C Motor control and power systems and methods of operation thereof |
| 08/28/1991 | EP0443032A1 Power supply control apparatus of inductance load |
| 08/27/1991 | US5043643 Energizing system for a variable reluctance motor |
| 08/27/1991 | US5043594 High torque-high speed universal power control console with attached foot pedal controller |
| 08/13/1991 | US5039973 Electronic foot pedal controller with booster power for universal motors |
| 08/08/1991 | DE4003455A1 Single-phase synchronous motor with stator control poles - has semiconductor controlled switch with gate electrode connected to winding of secondary control pole of pair |
| 08/06/1991 | US5038091 Electronic control for an appliance |
| 08/06/1991 | US5038084 Drill motor control |
| 07/31/1991 | EP0438827A1 Apparatus comprising an electric motor having a variable motor power |
| 07/24/1991 | CN1053328A Three-phase magnetic resistance motor |
| 07/23/1991 | US5034746 Analog-to-digital converter for computer disk file servo position error signal |
| 07/23/1991 | US5034675 Polyphase machine fed by a pulse-controlled a.c. converter |
| 07/20/1991 | CA2034252A1 Apparatus comprising an electric motor having a variable motor power |
| 07/17/1991 | EP0436742A1 Reluctance motor |
| 07/16/1991 | US5032773 Drive system with a drive motor |
| 07/12/1991 | WO1991011052A1 Improved motor controller having a control loop for neutralizing rotor leakage and magnetizing reactances |
| 07/12/1991 | CA2073438A1 Motor controller having a control loop for neutralizing rotor leakage and magnetizing reactances |
| 07/11/1991 | WO1991010281A1 A method and an arrangement for starting an electrical machine having varying reluctance |
| 07/11/1991 | DE4100341A1 Sewing machine control - uses motor speed and needle position to regulate motor speed according to the situation and prevent slip |
| 07/02/1991 | US5029265 Motor controller having a control loop for neutralizing rotor leakage and magnetizing reactances |
| 07/02/1991 | CA1285609C Induction motor control apparatus and method |
| 06/13/1991 | WO1991008611A1 Drive control method for variable reluctance type motor |
| 06/12/1991 | EP0431176A1 Stepping motor |
| 06/05/1991 | EP0430535A2 Electronic control circuit for A/C motors |
| 06/05/1991 | EP0429659A1 Driving system and controller therefor |
| 05/29/1991 | EP0429125A2 Circuit for controlling a free-piston engine, in particular of a refrigerator compressor |
| 05/29/1991 | DE4037072A1 Universal motor speed regulation by conduction angle - uses switched RC integrator to measure motor current |
| 05/28/1991 | CA1284518C Reluctance motor having h-shaped stator cores |
| 05/22/1991 | EP0427868A1 Reluctance-type electric motor |
| 05/21/1991 | US5016588 Throttle actuator and control system |
| 05/14/1991 | US5015939 Control circuit for switched reluctance motor |
| 05/14/1991 | US5015928 Universal series motor with speed limiting circuit to protect the motor from overspeeding during relatively-small loads |
| 05/02/1991 | EP0424467A1 Motor drive system |
| 04/30/1991 | US5012172 Control system for switched reluctance motor operating as a power generator |
| 04/30/1991 | US5012171 Control system for high speed switched reluctance motor |
| 04/30/1991 | CA1283698C Wound rotor motor control |
| 04/23/1991 | US5010425 Access controller for controlling the seek operation of a head relative to a recording medium |
| 04/17/1991 | EP0422226A1 Reluctance motor |
| 04/17/1991 | EP0146633B1 Numerical control system |
| 04/16/1991 | CA1283164C Control apparatus and method for operating a switched reluctance motor |
| 04/11/1991 | DE3933525A1 Inverter-fed motor excitation with isolated stator windings - involves switching between direct and indirect operations at different phases of sinusoidal cycle for separate inverters |
| 04/11/1991 | DE3933524A1 Inverter-fed motor operation with isolated stator windings - allows direct inverter operation at low speeds with quadrature sinusoidal currents from independent-fired thyristor bridges |
| 04/11/1991 | DE3933522A1 Frequency-dependent operation of parallel three=phase inverters - involves switching to indirect inverter operation at higher machine frequencies when one bridge current is zero |
| 04/11/1991 | DE3933520A1 Frequency-dependent operation of parallel three=phase inverters - involves switching to indirect inverter operation at higher machine frequencies by change of thyristor firing pattern |
| 04/09/1991 | US5006776 Gate-controlled electric drive |
| 04/09/1991 | US5006775 Method and apparatus for preventing a current collapse in a phase not participating in the commutation of a three-phase, block-current supplied synchronous machine |
| 04/09/1991 | US5006774 Torque angle control system for controlling the torque angle of a permanent magnet synchronous motor |
| 04/04/1991 | WO1991004602A1 Three-phase reluctance motor |
| 04/03/1991 | EP0419656A1 Speed controller |
| 03/21/1991 | WO1991003870A1 Power supply control apparatus of inductance load |
| 03/21/1991 | WO1991003868A1 Reluctance type motor |
| 03/20/1991 | EP0417956A2 Improvements in or relating to the control of linear motors |
| 03/06/1991 | CN1049760A Pulse width modulation type inverter having temp. compensation |
| 03/05/1991 | US4998053 Method and apparatus for reducing a current break in a leg that is not participating in the commutation of a three-phase block current fed synchronous machine |
| 02/27/1991 | EP0414643A2 Method and apparatus for monitoring and controlling linear motor robot apparatus and the like |
| 02/27/1991 | EP0414147A1 Circuit for rotating speed control of two-phase asynchronous motors |
| 02/27/1991 | EP0413966A2 Pulse width modulation type inverter having temperature compensation |
| 02/27/1991 | EP0413756A1 Method and apparatus for controlling the carriage of a linear motor |
| 02/27/1991 | EP0245395B1 Control circuit |
| 02/24/1991 | CA2023880A1 Electronic control for an appliance |
| 02/21/1991 | WO1991002402A1 Reluctance motor |
| 02/20/1991 | EP0413032A1 Method of controlling ac motor |
| 02/13/1991 | EP0412180A1 Drive device with a drive motor |
| 02/12/1991 | US4992709 Switching circuit providing adjustable capacitive series voltage dropping circuit with a fractional horsepower motor |
| 02/12/1991 | CA1280156C Inverter control apparatus for elevator motor |
| 02/12/1991 | CA1280146C Compound short-circuit induction machine |
| 02/06/1991 | EP0126778B1 Servomotor control system |
| 02/05/1991 | US4990843 Reluctance motor |
| 02/05/1991 | US4990002 Motor control circuit |
| 01/30/1991 | EP0409952A1 Control arrangement for a reluctance motor |
| 01/29/1991 | WO1991002401A1 A method and a device for sensorless control of a reluctance motor |
| 01/29/1991 | CA1279713C Linear drive motor multiple carrier control system |
| 01/24/1991 | DE4021098A1 Revolution regulation system for permanent magnet synchronous motor - switches from current regulation to load dependent regulation upon attaining required revs |
| 01/23/1991 | EP0409286A2 Overheat preventing system of A.C. motor |