| Patents for H02P 27 - Arrangements or methods for the control of ac-motors characterised by the kind of supply voltage (13,284) |
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| 09/19/1990 | EP0388274A1 Torque control system for an asynchronous motor |
| 09/19/1990 | CN1045491A Method and apparatus for controlling ac current regulator of single-phase or polyphase |
| 09/19/1990 | CN1009698B Method and apparatus for controlling voltage type convertor by p.w.m. |
| 09/18/1990 | US4958269 Current control for microprocessor motor drive |
| 09/13/1990 | DE4005679A1 Time point switching determination for AC motor control - comparing phase position of voltage falling across switching elements to mains voltage phase position |
| 09/11/1990 | US4956596 Variable speed drive system |
| 09/11/1990 | CA1273988A1 Power converter for a.c. load |
| 09/04/1990 | US4954764 Circuit and method for power efficiency improvement of induction motors |
| 08/29/1990 | EP0383949A1 Current limiting system for a voltage-type inverter |
| 08/23/1990 | WO1990009695A1 A device with a multi-phase load, a static converter and choke coils |
| 08/22/1990 | CN1044879A Method and arrangement for controlling single-phase or multiphase ac current regulator |
| 08/21/1990 | CA1273115A1 Method and apparatus for controlling power converter |
| 08/16/1990 | EP0381789A1 Control method and device for single or multiphase AC voltage converters |
| 08/15/1990 | CN1009236B Gating speed regulation method and apparatus thereof |
| 08/08/1990 | WO1990009701A1 Process and device for controlling single-phase or multiphase a.c. controllers |
| 08/08/1990 | EP0381094A1 Motor controller having SCR's |
| 08/08/1990 | CN1044551A Method and apparatus for controlling ac current regulator of singl-phase or polyphase |
| 08/07/1990 | US4947099 Motor controller with optical SCR's |
| 08/07/1990 | US4947088 Method and apparatus for controlling reel tension |
| 08/01/1990 | EP0379608A1 Method and device for controlling single or multiphase AC voltage converters |
| 07/26/1990 | WO1990008424A1 Device for controlling antiductors |
| 07/18/1990 | EP0377771A1 Torque control method for multiphase electronically commutated electric motors, especially for synchronous motors |
| 07/18/1990 | CN1008867B Control apparatus for pwm converter |
| 07/18/1990 | CN1008866B Control method for electric power converting apparatus and their arrangement |
| 07/12/1990 | WO1990007822A1 Method of controlling slip frequency of induction motor |
| 07/10/1990 | CA1271349A1 Continuous mill plant for rolling steel plates |
| 06/28/1990 | WO1990007228A1 Drive mechanism of induction motor |
| 06/28/1990 | WO1990007226A1 Method of controlling pwm inverter and an apparatus therefor |
| 06/28/1990 | WO1990007220A2 Electrically switched synchronous motor drive |
| 06/27/1990 | EP0374805A2 Electronically commutated synchronous driving motor |
| 06/20/1990 | EP0373227A1 Current control device for pwm control |
| 06/19/1990 | US4935684 Control system for induction motor |
| 06/19/1990 | CA1270518A1 Asynchronous motor regulated supply frequency converter |
| 06/14/1990 | WO1990006623A1 Control system for a motor |
| 06/06/1990 | EP0371442A1 Control method of pulse width modulation inverter and pulse width modulation inverter system |
| 05/30/1990 | EP0370896A1 Power interrupting device, particularly for a frequency convertor |
| 05/22/1990 | CA2003657A1 Power switching circuit, in particular for a frequency converter |
| 05/17/1990 | WO1990005407A1 A process and device for changing the actual rotation speed of a multi-phase non-synchronous motor and a suitable motor system for applying the process |
| 05/15/1990 | US4926105 Method of induction motor control and electric drive realizing this method |
| 05/15/1990 | US4926104 Adjustable speed AC drive system control for operation in pulse width modulation and quasi-square wave modes |
| 05/10/1990 | DE3931935A1 Reference current cascade for drive motor regulation - provides limit value inputs for limiting devices connected to revolution regulator |
| 05/09/1990 | EP0171415B1 Current sense demodulator |
| 05/08/1990 | US4924373 Apparatus and method for controlling switching elements in a PWN-controlled voltage source inverter |
| 05/02/1990 | CN1007807B Apparatus for operating elevator of winding drum type |
| 05/01/1990 | CA1268420A1 Solid phase diffusion assay |
| 04/24/1990 | US4920306 Method for controlling the torque of a synchronous machine supplied by a frequency converter |
| 04/18/1990 | CN1007688B Induction motor control apparatus and method for restart when rotating in shutdown |
| 04/18/1990 | CN1007686B Apparatus for controlling ac elevator |
| 04/17/1990 | US4918367 Method for controlling the torque of an ac motor |
| 04/11/1990 | EP0363158A2 Electrically powered active suspension for a vehicle |
| 04/11/1990 | CN1007572B Inverter control apparatus |
| 04/11/1990 | CN1007571B Control apparatus for pwm-controlled, veriable voltage/variable frequency inverters |
| 04/10/1990 | US4916368 Controlling method and device for permanent magnet synchronous motor |
| 04/04/1990 | EP0361833A2 Load commutated invertor (LCI) induction motor drive |
| 04/04/1990 | CN1041073A Electric power convertor with pulse restrainer |
| 03/27/1990 | US4912390 Apparatus for controlling firing of thyristors relative to a current reaching zero by using a microcomputer and hardware responsive to voltage crossing zero |
| 03/20/1990 | US4910450 Low cost three phase energy economizer |
| 03/15/1990 | DE3830196A1 Method for using phase-gating controllers as frequency converters |
| 03/14/1990 | EP0358225A2 Power converting apparatus including beat suppressor |
| 03/08/1990 | WO1990002442A1 Current limiting system for a voltage-type inverter |
| 03/06/1990 | US4906912 Apparatus for controlling the load angle of a converter |
| 03/06/1990 | US4906911 Electrical machine driven by a pulse-controlled a.c. converter |
| 02/28/1990 | EP0355115A1 Process for regulating the speed of rotation of an electric motor. |
| 02/28/1990 | CN1007028B Method of controlling transducer arrangement |
| 02/27/1990 | US4905135 Inverter apparatus |
| 02/27/1990 | US4904920 Method and device for operating an induction machine |
| 02/27/1990 | US4904919 Dual mode control of a PWM motor drive for current limiting |
| 02/21/1990 | CN1006948B Control arrangement for induction motor |
| 02/20/1990 | US4903187 Control for variable frequency drive |
| 02/14/1990 | EP0354435A2 A drive circuit for an insulated gate transistor; and its use in a switching circuit, a current switching apparatus and an induction motor system |
| 02/13/1990 | US4901001 Power converter for AC load |
| 02/07/1990 | EP0353715A2 Frequency changer |
| 02/01/1990 | DE3920691A1 Method for continuous adjustment of the output voltage of a self-commutated DC voltage intermediate-circuit converter |
| 01/31/1990 | EP0352354A1 Compound short-circuit induction machine and method of its control |
| 01/24/1990 | EP0351821A2 Apparatus for the control of a three-phase a.c. motor, especially a squirrel-cage motor |
| 01/24/1990 | EP0351783A2 PWM inverter apparatus |
| 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 |
| 01/17/1990 | CN1006513B Lift control apparatus |
| 01/10/1990 | EP0349568A1 Improved control method of an ac induction motor and device therefor |
| 12/27/1989 | CN1006268B 逆变器 Inverter |
| 12/26/1989 | US4890181 Short-circuit protection device for an electrical machine fed by a pulse-controlled A.C. converter |
| 12/21/1989 | DE3820562A1 Power supply source for a pulse-supplied electric motor |
| 12/20/1989 | EP0347408A1 Drive for lifting devices or the like |
| 12/19/1989 | US4888676 Damping circuit for turn-off valves |
| 12/12/1989 | US4887307 Speed control apparatus for electric motor |
| 12/06/1989 | EP0344370A1 Controlling an alternating current motor particularly at low speeds |
| 12/05/1989 | US4885520 Induction motor controller |
| 11/28/1989 | US4884185 Pulse width modulation converter |
| 11/28/1989 | US4884184 Control apparatus for cascaded converter circuit |
| 11/28/1989 | US4882923 Continuous mill plant for rolling steel plates |
| 11/14/1989 | US4881022 Method and/or apparatus for controlling the motor speed of an electric AC motor and/or a method of determining torque |
| 11/07/1989 | US4879503 Blower motor control for an air conditioner |
| 11/02/1989 | WO1989010655A1 Current control device for pwm control |
| 11/02/1989 | EP0339381A1 Circuit arrangement for the generation of a dephased sine wave voltage |
| 11/01/1989 | CN1005624B Elevator rescue apparatus during stoppage of power supply |
| 10/25/1989 | EP0338777A2 Speed control system for elevators |
| 10/10/1989 | US4873478 Method and apparatus for controlling an alternating current motor particularly at low speeds |
| 10/05/1989 | WO1989009512A1 Method of calculating magnetic flux of an induction motor |
| 10/04/1989 | EP0335599A2 Inverter speed control unit |
| 10/04/1989 | EP0335580A2 Phase and frequency locked motor control system and method of motor control |