| 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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| 06/23/1994 | CA2151829A1 Power control system for an a.c. induction motor |
| 06/22/1994 | EP0602490A2 Procedure and apparatus for compensating the slip of an induction machine |
| 06/21/1994 | US5323096 Servomotor control device using servomotor rotation speed extrapolation |
| 06/17/1994 | CA2110465A1 Procedure and apparatus for compensating the slip of an induction machine |
| 06/15/1994 | CN1025065C Operation control circuit for pump motor |
| 06/01/1994 | EP0599190A2 Motor speed control apparatus |
| 05/31/1994 | US5317668 Motor control device for controlling motor speed depending on imparted load |
| 05/31/1994 | US5317242 Motor-driving circuit and wire-bonding apparatus |
| 05/24/1994 | CA1329827C Motor controller |
| 05/19/1994 | DE4238965A1 Electric motor with incorporated rpm sensor - uses motor control voltage for providing earth voltage for rotation sensor via diode half-bridge |
| 05/18/1994 | EP0597370A2 Machine for comminuting materials or for pressing with electric motor. |
| 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 |
| 05/05/1994 | 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 |
| 05/05/1994 | DE4335917A1 Device for creating an oscillating movement, such as for ringing a bell - has motor with static relay and reversing relay in two phases, plus relay in third phase |
| 05/05/1994 | DE4237013A1 Electrically-adjustable X-ray device - uses setting motor for servo-assistance of manually guided positioning movement |
| 05/04/1994 | EP0595560A1 Speed control arrangement for electric motors |
| 05/04/1994 | CN1024441C Method and apparatus for optimization of thyristor power supply transport time delay |
| 05/03/1994 | US5309079 Digital three-phase PWM signal |
| 04/28/1994 | DE4334148A1 Optimising phase accuracy of belt drive - incrementally measuring driven and drive shaft positions, and compensating for angular deviation of driven shaft position |
| 04/19/1994 | US5304911 Power control system for an A.C. induction motor |
| 04/19/1994 | US5304907 Servo system that controls a motor and compensates for system irregularities |
| 04/14/1994 | WO1994008389A1 Method for control of ac motor |
| 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. |
| 04/06/1994 | EP0590653A1 Motor control system |
| 04/05/1994 | US5301131 Apparatus and method for controlling the rotational speed of a motor |
| 03/30/1994 | EP0388464B1 Control device |
| 03/29/1994 | US5299277 Flexible disk drive device |
| 03/17/1994 | WO1994006203A1 Servo waveform display system |
| 03/16/1994 | EP0587404A2 Electronic motor protection apparatus |
| 03/15/1994 | US5294872 Method and apparatus for operating vacuum cleaner |
| 03/02/1994 | EP0584748A2 Control apparatus for an induction motor |
| 02/17/1994 | WO1994003966A1 Power regeneration system |
| 02/15/1994 | US5287045 Fully digital apparatus for controlling operation of electric motor |
| 02/03/1994 | WO1994002988A1 Method for estimating inertia and disturbance torque, and method for detecting abnormal load |
| 01/26/1994 | EP0579694A1 Process and circuits for determining machine-related electromagnetic and mechanical state variables on electrodynamic induction machines supplied via converters. |
| 01/13/1994 | DE4222431A1 Device for switching between windings of a single-phase electric motor - has Triacs across each auxiliary winding in chain parallel to main winding, with control unit for gates |
| 01/12/1994 | EP0577839A1 Servo control method |
| 01/12/1994 | EP0577626A1 A method and a device for altering of the angular velocity of a driven rotating media carrier |
| 01/05/1994 | DE4221619A1 Motor revolution rate stabilising arrangement - contains phase comparator with sample=and=hold element, pulse shapers, reference signal generator and motor control circuit. |
| 01/05/1994 | DE4221060A1 Vehicle erroneous processor signals filtering device - has signals derived from monitors passed thorough line of filters with signal processed through monitoring circuit after each tapping |
| 01/04/1994 | US5276392 Single phase AC motor speed control system |
| 01/04/1994 | CA1325735C Method and device for accelerating test pieces on a circular path, and the use of the device |
| 12/22/1993 | EP0575140A1 Speed sensorless variable voltage variable frequency induction motor drive |
| 12/22/1993 | CN1079849A Power converting apparatus with power regenerative control function |
| 12/21/1993 | US5272423 Velocity control method for a synchronous AC servo motor |
| 12/21/1993 | US5271348 Drive arrangement |
| 12/16/1993 | DE4319254A1 Regenerative power control for current regulator - blocks operation of upper or lower arm of rectifier stage when regenerative current is above given reference current |
| 12/15/1993 | EP0347465B1 Method controlling servomotor |
| 12/14/1993 | US5270634 Polyphase alternating current motor |
| 12/14/1993 | US5270632 Driving system for an induction motor having a circuit for generating a slip pulse and a phase shifting pulse |
| 12/09/1993 | WO1993024990A1 Control method for synchronous motor |
| 11/24/1993 | EP0570834A1 Circuit for varying a loop gain of a spindle servo |
| 11/23/1993 | US5264773 Controller for induction motor |
| 11/18/1993 | EP0569588A1 Device for controlling current application to inductance coil |
| 11/16/1993 | US5263113 Method and apparatus for controlling the speed of a motor |
| 11/16/1993 | CA1324427C Speed control for orbital shaker with reversing mode |
| 11/11/1993 | WO1993022717A1 Motor driven step switch |
| 11/11/1993 | DE4214431A1 Motorantrieb für Stufenschalter Motor drive for tap changers |
| 11/09/1993 | US5260631 For a rotatable element |
| 10/20/1993 | EP0371094B1 Digital motor control system |
| 10/13/1993 | EP0564771A2 Drive control apparatus for electrical machine and parameter display method in drive control apparatus for electrical machine |
| 10/12/1993 | US5252904 For connection to an AC power source; split capacitor motor |
| 10/07/1993 | DE4210933A1 Evaluating output signal of vehicle revolution rate sensor - involves sensing markings and evaluating pulse signal separations to detect reference marker |
| 10/06/1993 | EP0314800B1 Device for controlling speed of servo motor |
| 10/05/1993 | US5250885 Based on an encoding signal |
| 10/05/1993 | US5250883 Motor drive control apparatus |
| 09/29/1993 | EP0562633A2 Motor servo system |
| 09/29/1993 | CN1022277C Variable speed controlled induction motor |
| 09/22/1993 | EP0561425A1 Synchronous motor having selectable rotation direction |
| 09/22/1993 | EP0207172B1 Drive control system for servo motors |
| 09/16/1993 | WO1993018577A1 Method and apparatus for correcting hysteresis synchronous motor hunting |
| 09/14/1993 | US5245531 Multiplexed digital control device |
| 09/07/1993 | US5243268 Electric machine system |
| 09/02/1993 | WO1993017490A1 Controlling device for electric motors |
| 09/01/1993 | EP0557543A1 Variable speed motor control |
| 08/31/1993 | US5241256 Method and apparatus for controlling the supply of power to an induction motor to maintain high efficiency under varying load conditions |
| 08/31/1993 | US5241255 Failure detector for regeneration power absorbing means |
| 08/31/1993 | US5241252 Motor drive system for a polygon scanner |
| 08/26/1993 | DE4241941C1 Fuzzy logic controller for electric motors - has motor load parameters measured and fed back to select fuzzy actions to be interpreted for drive control |
| 08/25/1993 | EP0557242A1 Drive system for a woollen card and a card |
| 08/18/1993 | EP0556013A1 Energy-saving control apparatus and control method for induction motor |
| 08/18/1993 | CN1075384A Energy-saving control apparatus and control method |
| 08/10/1993 | US5235682 Port output controller for use in microcomputer |
| 08/10/1993 | US5235263 Method and apparatus for correcting hysteresis synchronous motor hunting |
| 08/05/1993 | WO1993015549A1 Servo control method |
| 08/04/1993 | EP0397818B1 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 |
| 08/04/1993 | EP0314812B1 Alternating current motor control system with emergency control |
| 08/04/1993 | EP0278988B1 Alternating current motor control apparatus |
| 08/03/1993 | US5233276 Motor control circuit |
| 07/28/1993 | EP0552184A1 Process for determining the load of an asynchronous motor fed via a frequency converter and a device for carrying out the process. |
| 07/27/1993 | US5231341 Limiter circuit of servo motor control apparatus |
| 07/27/1993 | US5231339 Control device for induction motor |
| 07/21/1993 | EP0551450A1 Four quadrant motor controller |
| 07/20/1993 | US5229700 Calibration of signal feedback through VCO's |
| 07/14/1993 | EP0551053A1 Stopping device for an induction machine with capacitor |
| 07/13/1993 | US5227942 Structure and method for distributing failure-induced transient currents in a multiphase electrical machine |
| 07/13/1993 | US5227711 Motor controller |
| 07/06/1993 | US5225754 Control system for a motor |