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| Number | Title | Issue Date |
| 7062160 | Monitoring current in a motor during acceleration to verify motor frequency lock Method and apparatus for accelerating a motor from an intermediate velocity to a final operational velocity. The motor is accelerated from rest to the intermediate velocity through application of fixed duration drive pulses to the spindle motor. Once the motor reach... | 06/13/2006 |
| 6992451 | Motor control apparatus operable in fail-safe mode In a motor feedback control, the current supply phase is set on the basis of the encoder count of an encoder and the current supply phase is also set on the basis of the encoder count by time-synchronous processing. In the feedback control, a maximum value or a mini... | 01/31/2006 |
| 6940250 | Synchronous motor control device and method of correcting deviation in rotational position of synchronous motor In a synchronous motor control device that corrects a deviation in rotational position which is related to a rotational position detector for a synchronous motor on which vector-control is performed, the synchronous motor control device includes: a current instructi... | 09/06/2005 |
| 6694232 | Control device for hybrid vehicle A control device for a hybrid vehicle which comprises an engine and a motor-generator that is capable of generating electrical power as power sources, and in which the power of at least one of the engine and the motor-generator is transmitted to an output... | 02/17/2004 |
| 6573672 | Fail passive servo controller The present invention provides apparatus, systems and methods for fail passive servo controllers. In accordance with an exemplary embodiment of the present invention, servo controller is used with an ALS to control an aircraft during landing procedures. I... | 06/03/2003 |
| 6448736 | Method for controlling switched reluctance motor, and controller A method to control a switched reluctance motor (SRM) with a first phase (1) and a second phase (2) comprises: aligning the rotor with the second phase (2); at a first time point (t1), energizing the first phase (1) with a phase voltage that is... | 09/10/2002 |
| 6150790 | Method for the starting and steady-state supply of a permanent-magnet synchronous motor particularly for driving a hydraulic pump A method for the starting and steady-state supply of a permanent-magnet synchronous motor, particularly for driving a centrifugal hydraulic pump. The method comprises three successive steps: a first learning step, a second starting step, and a third stead... | 11/21/2000 |
| 5905354 | Motor stopped verification sensor The present invention relates to a sensor for verifying that a motor has stopped rotating including rotation due to inertia. Respective signal input lines are connected to three power supply lines of a three phase AC motor. A high frequency signal current is s... | 05/18/1999 |
| 5475292 | Apparatus for restarting inverter for driving synchronous motor after momentary interruption An apparatus for restarting an inverter after momentary interruption by detecting a power restoration after a momentary outage of a power supply that supplies power to the inverter for driving a synchronous motor. The apparatus includes a frequency detect... | 12/12/1995 |
| 5015938 | Synchronizable drive system The drive system connects a servomotor via a clutch to a shaft after the motor has started up from a standstill to a speed in synchronism with the supply frequency to the servomotor. The clutch may also be actuated to disengage the servomotor from the sha... | 05/14/1991 |
| 4683411 | Synchronous motor protection A digital controller for synchronous motors prevents excessive heating of squirrel cage windings during motor starting. It reduces motor excitation if the actual accrued excitation time exceeds the maximum allowable excitation time of the controlled motor... | 07/28/1987 |
| 4641074 | Synchronous motor protection A digital controller for synchronous motors prevents excessive heating of squirrel cage windings during motor starting. It reduces motor excitation if the actual accrued excitation time exceeds the maximum allowable excitation time of the controlled motor... | 02/03/1987 |
| 4291263 | Amortisseur winding protection system This invention relates to a system for protecting an amortisseur winding during the starting of a synchronous motor. The system compares the actual slip frequency of the accelerating motor with predetermined slip frequencies. These predetermined slip freq... | 09/22/1981 |
| 4128792 | Control and protection of brushless synchronous motors Apparatus for controlling the starting of a three-phase, salient pole, synchronous motor employs a signal representing slip frequency obtained from a power sensor connected to the motor supply. It requires no connection to the field coil or to other motor... | 12/05/1978 |
