| Patents for H02P 21 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation (7,114) |
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| 03/15/1995 | EP0491881B1 Process for correcting the reference flux of a converter-powered multi-phase machine and circuit for implementing the process |
| 03/09/1995 | DE4330181A1 Method for continuous guidance of the rotor flux of an asynchronous motor which is supplied via a controllable invertor, including its operation in the weak flux region |
| 03/07/1995 | US5396161 Temperature compensator circuit for an induction motor |
| 02/22/1995 | CN1099200A Method for controlling induction motor |
| 02/14/1995 | US5390102 Parallel running control apparatus for PWM inverters |
| 02/08/1995 | EP0637870A1 Vector control apparatus for induction motor |
| 02/07/1995 | US5388052 Method of operating an induction motor |
| 02/07/1995 | US5387855 Induction motor control system |
| 02/02/1995 | WO1995003649A1 Process and device for compensating a fault voltage at a pulse-controlled inverter |
| 01/31/1995 | US5386186 Stator flux oriented control |
| 01/11/1995 | EP0633653A1 Method of current regulation and device for a voltage converter |
| 01/11/1995 | CN1027414C Apparatus for controlling of parallel-working pulse with modulating inverters |
| 01/10/1995 | CA2127728A1 Method and apparatus for current regulating in a voltage-injecting converter |
| 12/28/1994 | EP0631373A2 Method and apparatus for controlling hybrid excitation type permanent magnet synchronous motor |
| 12/06/1994 | US5371458 Method for determining the stator flux of an asynchronous machine |
| 11/30/1994 | EP0401386B1 Method of controlling slip frequency of induction motor |
| 11/15/1994 | US5365158 Driving control apparatus for induction motor |
| 11/03/1994 | DE4413809A1 Method for controlling an induction motor, and devices driven by such an induction motor |
| 11/02/1994 | CN1026401C Apparatus for contrelling elevator speed |
| 09/29/1994 | WO1994022213A1 A method for determining a stator flux estimate for an asynchronous machine |
| 09/28/1994 | EP0617504A1 Discrete-time current control method of an inverter-fed asynchronous motor |
| 09/13/1994 | US5347206 Vector control method of 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 | US5341081 Vector control apparatus for induction motor |
| 08/03/1994 | EP0608571A2 Vector control system for induction motor |
| 08/02/1994 | US5334924 Induction motor control system |
| 08/02/1994 | US5334923 Motor torque control method and apparatus |
| 07/12/1994 | US5329217 Compensated feedforward voltage for a PWM AC motor drive |
| 06/28/1994 | US5325036 Elevator speed sensorless variable voltage variable frequency induction motor drive |
| 06/15/1994 | EP0601419A1 Circuit to control a brushless DC motor |
| 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 |
| 06/01/1994 | EP0598921A1 Vector controller of induction motor |
| 05/31/1994 | US5317246 Device for controlling the torque of an asynchronous electric motor by controlling the phase of the motor stator voltage |
| 05/17/1994 | US5313151 Induction type electric motor drive actuator system |
| 05/11/1994 | CN1024456C Elevator operating device for power break-off |
| 05/03/1994 | US5309353 Multiple reference frame controller for active filters and power line conditioners |
| 05/03/1994 | US5309075 Digital servo-control apparatus for preventing torque variations |
| 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 |
| 04/20/1994 | CN1085697A Circuit for controlling power converting apparatus |
| 04/19/1994 | US5304912 Control apparatus for induction motor |
| 04/14/1994 | DE4233804A1 Control of permanent magnet synchronous machine - adjusting pilot angle between armature current and voltage in proportion to output of phase current regulator |
| 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. |
| 03/29/1994 | US5298847 Counter EMF detector for use in electric motor controllers |
| 03/23/1994 | EP0588213A2 Method for measuring characteristic constants of alternating current motor and controller thereof based on said method |
| 03/22/1994 | US5296794 State observer for the permanent-magnet synchronous motor |
| 03/22/1994 | US5296793 State observer for synchronous motors |
| 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 |
| 02/17/1994 | WO1994003965A1 A method of determining a residual flux of an inverter-supplied squirrel cage induction machine |
| 02/15/1994 | US5287045 Fully digital apparatus for controlling operation of electric motor |
| 02/08/1994 | US5285145 Current-limit system for voltage-type inverter |
| 02/08/1994 | US5285029 Device for driving elevator at service interruption |
| 02/02/1994 | EP0581396A1 Method for self-controlling a converter-powered three-phase machine |
| 01/26/1994 | EP0579694A1 Process and circuits for determining machine-related electromagnetic and mechanical state variables on electrodynamic induction machines supplied via converters. |
| 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 |
| 01/18/1994 | 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 |
| 01/11/1994 | US5278486 Method of operating slip angular velocity of induction motor |
| 01/11/1994 | US5278485 Control circuit for induction motor |
| 12/23/1993 | WO1993026081A1 Vector controller of induction motor |
| 12/22/1993 | EP0575140A1 Speed sensorless variable voltage variable frequency induction motor drive |
| 12/21/1993 | US5272429 Method of maximizing efficiency of an alternating current machine |
| 12/15/1993 | EP0574322A1 Method to control a pulse width modulated polyphase voltage inverter and device to carry out the method |
| 12/14/1993 | US5270498 Elevator speed control apparatus with drive motor residual secondary magnetic flux control |
| 12/07/1993 | US5268628 Phase voltage measuring device of an AC motor and a measuring method thereof |
| 11/24/1993 | EP0570602A2 Three-phase machine regulation method with high quality dynamical determination of its statorvoltages in the electrical steady state |
| 11/18/1993 | EP0569556A1 Variable speed wind turbine |
| 11/11/1993 | WO1993022828A1 Method of controlling pwm inverter |
| 11/04/1993 | DE4313545A1 Control circuit for inverter depending on one or several desired values - includes excitation producing unit for producing excitation current correlative from measured signal for each phase of induction motor prim. current |
| 11/02/1993 | US5258904 Dither control method of PWM inverter to improve low level motor torque control |
| 10/26/1993 | US5256944 Motor speed control method and apparatus with drooping compensation independent of acceleration or deceleration current and time constant of motor |
| 10/20/1993 | EP0566322A2 Automatic motor torque and flux controller for battery powered vehicle drive |
| 10/20/1993 | EP0566320A2 Reconfigurable AC induction motor drive for battery-powered vehicle |
| 10/06/1993 | CN1077065A Apparatus for chang of electric power |
| 09/30/1993 | DE4209305A1 Field oriented control of asynchronous machines - having integrator for U delta -Uref, output with I eta subtracted and input to proportional amplifier to give Uref. |
| 09/15/1993 | CN1076168A Device for controlling speed of elevator |
| 08/18/1993 | EP0555844A1 Motor drive control apparatus having a plurality of motor characteristics |
| 08/04/1993 | EP0553370A1 Apparatus for controlling the rotational speed of an induction machine |
| 07/21/1993 | EP0551450A1 Four quadrant motor controller |
| 07/06/1993 | US5225712 Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation |
| 07/06/1993 | CA1319949C Method and apparatus for controlling the magnetic flux of an induction motor |
| 06/30/1993 | EP0548676A1 Flux regulator particularly for drivers of asynchronous electric motors |
| 06/16/1993 | CN1073308A Driving control apparatus for induction motor |
| 06/10/1993 | WO1993011604A1 Variable speed wind turbine with reduced power fluctuation and a static var mode of operation |
| 06/09/1993 | EP0545222A1 Torque control device for electrical asynchronous motor |
| 05/18/1993 | US5212438 Induction motor control system |
| 04/28/1993 | EP0539029A2 Temperature compensated circuit for induction motor |
| 04/27/1993 | US5206574 Vector control apparatus for induction motor |
| 04/20/1993 | US5204607 Process for correcting the reference flux of a converter-powered multi-phase machine and circuit for implementing the process |
| 04/14/1993 | EP0536569A2 AC motor control apparatus and control apparatus of electric rolling stock using the same |
| 04/07/1993 | EP0535281A1 Torque feedback system |
| 04/07/1993 | EP0535280A1 Flux feedback system |
| 04/06/1993 | US5200682 Motor current phase delay compensating method and apparatus thereof |
| 03/18/1993 | DE3744985C2 Induction motor control method e.g. for robotics |
| 03/17/1993 | EP0218729B1 Method of controlling a three-phase induction motor |
| 03/16/1993 | US5194797 Procedure for the regulation of an asynchronous motor |
| 03/04/1993 | DE4129053A1 Controlling inverter-fed synchronous machine drive - using decoupling transformation to calculate stator flux components for two axes from electric torque and stator flux linkage |
| 03/03/1993 | EP0529120A1 Control method for the drive of a lifting device |
| 02/25/1993 | DE4127865A1 Evaluating slip-frequency dependent load-condition variable in induction motor drive - deriving flux linkage components by integration, then squaring and dividing into torque using first order delay stage |