Electric motor controller with bypass contactor

Details Electric motor controller with bypass contactor Electric motor controller with bypass contactor

H - Electricity

02

P

318/65

H02P 1/28 (2006.01) H02P 3/18 (2006.01) H02P 3/20 (2006.01) H02P 27/02 (2006.01)

Patent

CA 2036026

A three-phase motor is operated by a controller having sets of thyristors which when triggered switch electricity from each phase of a supply to the motor. The motor is started by triggering the thyristors to be conductive during successively greater portions of each cycle of the AC power. In order to reduce the cooling requirements for the controller, a contactor is connected in parallel with the thyristors to apply power to the motor once it reaches full speed. When the controller receives a signal to stop the motor, the contactor is deactivated and the controller goes through a sequence to synchronize the thyristor triggering process to the phase of the AC power supply. The synchronizing process provides a smooth transition from contractor control back to thyristors control of the electricity application to the motor. Once the thyristor control resumes, the controller executes a triggering routine which decreases the voltage applied to the motor.

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