| 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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| 11/30/1994 | EP0626753A1 Control device for induction motor |
| 11/30/1994 | EP0401386B1 Method of controlling slip frequency of induction motor |
| 11/24/1994 | WO1994027360A1 Method for controlling current for synchronous motor |
| 11/24/1994 | WO1994027358A1 Method for controlling feedback for regenerated current |
| 11/16/1994 | CN1026644C Electric power converter arrangement and electric rolling stock control device using the same |
| 11/09/1994 | EP0623991A1 Dimming device for a load |
| 11/09/1994 | CN1094872A Device for controlling the variation of the power and/or the speed of a load |
| 11/06/1994 | CA2122648A1 Power and/or speed control device |
| 11/01/1994 | US5361196 Power converter for converting DC voltage into AC phase voltage having three levels of positive, zero and negative voltage |
| 10/26/1994 | EP0620920A1 Method for determining the short-circuit inductance of an asynchronous machine |
| 10/25/1994 | US5359278 Zero current switching circuit and converting apparatus using the same |
| 10/18/1994 | US5357181 Failure detection method for electric vehicles and fail-safe control method using this method |
| 10/18/1994 | US5355749 Control apparatus and control method for motor drive vehicle |
| 10/12/1994 | EP0619639A1 Electronically commutated synchronous driving motor |
| 10/12/1994 | CN1093507A Method and apparatus for controlling single phase induction motor |
| 10/11/1994 | US5355297 Three-level three-phase inverter apparatus |
| 10/11/1994 | US5355136 Analog-to-digital converter circuit |
| 10/06/1994 | DE4310485A1 Method for the operation of a circuit arrangement for controlling or regulating the acceleration (starting), braking and rotation speed of a three-phase asynchronous motor |
| 09/29/1994 | DE4310043A1 Circuit arrangement for controlling or regulating the starting (acceleration), braking and rotation speed of a three-phase asynchronous motor |
| 09/22/1994 | DE4308836A1 Method for operating a three-phase motor using a converter with a variable frequency and voltage |
| 09/21/1994 | EP0616417A1 Method for control of ac motor |
| 09/20/1994 | US5349142 Energy conservation type hydraulic elevator and speed control method of hydraulic elevator |
| 09/15/1994 | DE4307467A1 Electronically commutated asynchronous motor |
| 09/14/1994 | EP0615336A1 High-efficiency power supply control apparatus for variable-speed induction motor |
| 09/13/1994 | US5347443 Inverter apparatus and a restarting method at an instantaneous power failure |
| 09/09/1994 | CA2118550A1 High-efficiency power supply control apparatus for variable-speed induction motor |
| 09/06/1994 | US5345158 Electrical distribution equipment with torque estimating capability |
| 08/31/1994 | EP0515469B1 Method and apparatus for controlling an ac induction motor by indirect measurement of the air-gap voltage |
| 08/23/1994 | US5341080 Apparatus and three phase induction motor starting and stopping control method |
| 08/02/1994 | US5334924 Induction motor control system |
| 08/02/1994 | US5334922 Asynchronous motor speed control method and device |
| 07/27/1994 | EP0607646A1 Elevator velocity control |
| 07/27/1994 | CN1090100A Method for driving of electric motor |
| 07/06/1994 | EP0605328A1 Optimal power supply for electric motor |
| 06/29/1994 | EP0603683A2 Frequency converter, procedure for controlling it and motor control using a frequency converter |
| 06/28/1994 | US5325036 Elevator speed sensorless variable voltage variable frequency induction motor drive |
| 06/28/1994 | US5323613 Motor-generator voltage controller for turbocharger |
| 06/22/1994 | EP0602490A2 Procedure and apparatus for compensating the slip of an induction machine |
| 06/21/1994 | US5323097 Method for producing a speed reference signal for crane motor control |
| 06/17/1994 | CA2110465A1 Procedure and apparatus for compensating the slip of an induction machine |
| 06/14/1994 | US5321599 Control apparatus for suppressing a third harmonic neutral point voltage in a three level inverter |
| 06/09/1994 | DE4341135A1 Control of synchronous motor used e.g. in machine tool - controlling magnitude and phase of currents in winding carrying both field and armature current components |
| 06/08/1994 | EP0451287B1 Main shaft motor control method |
| 06/01/1994 | EP0599608A2 Method and apparatus for driving motor |
| 06/01/1994 | EP0598921A1 Vector controller of induction motor |
| 05/18/1994 | EP0597132A1 Power converter |
| 05/18/1994 | EP0597118A1 Control method for synchronous motor |
| 05/18/1994 | CN1086938A Method for controlling of operation of compressor |
| 05/17/1994 | US5313151 Induction type electric motor drive actuator system |
| 05/17/1994 | US5313150 Drive control apparatus for an air conditioner having a modular inverter and a control circuit mounted on a common substrate |
| 05/11/1994 | CN1024456C Elevator operating device for power break-off |
| 05/05/1994 | DE4337501A1 Controlling three=phase currents of inverter applied at induction motor - converting to two=phase current in arithmetical manner and obtaining peak value of two=phase currents in first step |
| 05/04/1994 | EP0595560A1 Speed control arrangement for electric motors |
| 05/03/1994 | US5309089 Method of measuring unsaturated inductances of an equivalent circuit of a synchronous machine |
| 05/03/1994 | US5309079 Digital three-phase PWM signal |
| 05/03/1994 | US5309078 Synchronous rectification method for reducing power dissipation in motor drivers in PWM mode |
| 04/27/1994 | EP0593738A1 Programmed pwm inverter controller |
| 04/26/1994 | US5307259 Process for compensating a phase and amplitude response between a multiphase setpoint and actual value and circuit for implementing the process |
| 04/21/1994 | DE4306350C1 Current regulator for static frequency converter-fed sync machine - includes amplification adaptation stage having generator for characteristic defining max and min amplification. |
| 04/20/1994 | CN1085697A Circuit for controlling power converting apparatus |
| 04/19/1994 | US5304912 Control apparatus for induction motor |
| 04/14/1994 | WO1994008389A1 Method for control of ac motor |
| 04/12/1994 | CA1328498C Method for controlling the torque of a synchronous machine supplied by a frequency converter |
| 04/07/1994 | DE4332555A1 Overcurrent protection switch for electric motor-driven systems - computes estimate of output torque from measurements supplied by three=phase current and voltage transformers and potential dividers. |
| 03/31/1994 | WO1994007301A1 Process and device for regulating a converter-powered, permanently excited synchronous motor |
| 03/31/1994 | WO1994007188A1 Servo amplifier and servo system |
| 03/30/1994 | EP0589525A1 Switching device for driving an asynchronous two-phase motor |
| 03/29/1994 | US5298871 Pulse width modulation signal generating circuit |
| 03/29/1994 | US5298848 Large capacity variable speed PWM spatial vector type sub-harmonic system for driving AC electric motor |
| 03/23/1994 | EP0588388A2 Current-limiting system for voltage-type inverter |
| 03/23/1994 | EP0588320A2 Semiconductor device having planar junction |
| 03/17/1994 | WO1994006114A1 Process and device for controlling with pulsed signals |
| 03/16/1994 | CN1083985A Electric power changing apparatus |
| 03/16/1994 | CN1083984A Apparatus for controlling of parallel-working pulse width modulating inverters |
| 03/15/1994 | US5294876 Method and apparatus for controlling an AC induction motor by indirect measurement of the air-gap voltage |
| 03/15/1994 | US5294871 Electric motor control system |
| 03/10/1994 | DE4229342A1 Verfahren und Vorrichtung zur Ansteuerung mit gepulsten Signalen Method and apparatus for driving with pulsed signals |
| 03/09/1994 | EP0585703A2 Method and means for measuring electrical quantities, especially the current, in an electric motor fed by a frequency transformer |
| 03/09/1994 | CN1083637A Apparatus for restarting inverter for driving sync hronous motor after momentary interruption |
| 03/02/1994 | EP0584748A2 Control apparatus for an induction motor |
| 03/01/1994 | US5290975 Elevator controlling device |
| 02/24/1994 | DE4326187A1 Inverter regulating motor drive of winding machine - corrects calculated drive regulator output frequency in dependence on detected tension of wound material web |
| 02/23/1994 | EP0583560A2 Refrigerator and/or freezer equipped for connection to single phase alternating current |
| 02/22/1994 | US5289366 Method and apparatus for correction of a detected faulty actual valve of a signal affected by harmonic vibrations |
| 02/16/1994 | EP0500528B1 Process for correcting a detected faulty actual value of a signal with harmonic vibrations and circuit arrangement for implementing this process |
| 02/15/1994 | US5287051 Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive |
| 02/09/1994 | EP0582470A1 Synchronous motor control for electric vehicle |
| 02/09/1994 | EP0414865B1 Process for masking the noise signals emitted by the sound-emitting mechanical elements of a vehicle, in particular a submerged submarine, and submarine |
| 02/08/1994 | US5285145 Current-limit system for voltage-type inverter |
| 02/08/1994 | US5285029 Device for driving elevator at service interruption |
| 02/03/1994 | DE4325210A1 Re-starting device for sync drive motor inverter following short interruption - synchronises frequency and phase of motor terminal voltage and required inverter output voltage to provide re-starting command |
| 01/26/1994 | EP0579948A1 Control system for an asynchronous motor |
| 01/26/1994 | EP0474629B1 Process for compensating a phase and amplitude cycle between a multi-phase actual and set value and circuit for implementing the process |
| 01/19/1994 | EP0579513A1 Torque control system for AC motor |
| 01/18/1994 | US5280419 Method and switching arrangement for regulation of a two-dimensional vector of a segment by means of a value-discrete setting element with a limited switching frequency |
| 01/18/1994 | US5280228 Inverter circuit |
| 01/12/1994 | EP0578555A1 Pulse-controlled converter and electronic motor control |
| 01/12/1994 | CN1023530C Synchronous motor controlling system |
| 01/11/1994 | US5278486 Method of operating slip angular velocity of induction motor |
| 01/11/1994 | US5278485 Control circuit for induction motor |