Reducing power consumption and monitoring synchronous running of

Details Reducing power consumption and monitoring synchronous running of Reducing power consumption and monitoring synchronous running of

1985-10-03

1987-07-28

Salce, Patrick R.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318729, 323910, H02P 528

Patent

active

046834133

ABSTRACT:
A control system for a three-phase motor has two triac switches connected in respective supply lines to the motor. Both switches are initially closed so that power is supplied to the motor on all three lines. After a predetermined time, when the motor has reached its operating speed, one switch is opened by a logic unit so that single phase power is supplied to the motor on two lines. One of the switches is subsequently periodically closed for short intervals, and the other switch is periodically opened for short intervals under control of a monostable unit, so as to produce hunting of the motor. Hunting of the motor is detected by a speed monitor responsive to the counter EMF of the motor. The system has a phase detector responsive to the phase relationship between signals on the supply lines which prevents the switches being closed if there is not the desired phase relationship between the signals.

REFERENCES:
patent: 3536957 (1970-10-01), Iverson et al.
patent: 3684936 (1972-08-01), Graf
patent: 3976919 (1976-08-01), Vandevier et al.
patent: 4242625 (1980-12-01), Hedges
patent: 4333046 (1982-06-01), Lee
patent: 4422030 (1983-12-01), McAllise
patent: 4482853 (1984-11-01), Bhavsar

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