Electric motor controller with bypass contactor

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

1990-03-16

1991-02-26

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Braking

318763, 318779, H02P 318, H02D 540

Patent

active

049964690

ABSTRACT:
A three-phase motor controller includes a bidirectional thyristor switch to couple each phase of an electrical supply to a motor. The motor is started by rendering the thyristors conductive during successively greater portions of each cycle of AC electricity from the supply. In order to reduce the cooling requirements of the controller, a contactor is connected in parallel with the thyristors to provide apply electricity 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 to the AC electricity. The synchronizing process provides a smooth transition from contractor control back to thyristor control of the application of electricity to the motor. Once thyristor control resumes, the controller executes a triggering routine which decreases the voltage applied to the motor and produces a braking effect.

REFERENCES:
patent: 3897595 (1975-07-01), Fearno
patent: 4100469 (1978-07-01), Nelson et al.
patent: 4417191 (1983-11-01), Schmidt
patent: 4456867 (1984-06-01), Mallick et al.
patent: 4540921 (1985-09-01), Boyd, Jr. et al.
patent: 4560913 (1985-12-01), Min
patent: 4683411 (1987-07-01), Hamilton et al.
patent: 4833386 (1989-05-01), Unsworth et al.
patent: 4857814 (1989-08-01), Duncan

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