Electronic control circuit for A/C motors

Details Electronic control circuit for A/C motors Electronic control circuit for A/C motors

1990-11-21

1992-02-04

Smith, Jr., David

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388919, H02P 516

Patent

active

050864912

ABSTRACT:
A control circuit for alternating current motors comprises a bidrectional controlled diode (TRIAC) connected in series to the motor and with its own control terminal connected to a fixed-phase actuating network in order to supply partial power to the motor. The control terminal is also connected to a switching device, piloted by a control signal to supply it, when closed, with a bias current which causes the continuous operation of the TRIAC, so as to supply full power to the motor. The control circuit can be used in conjunction with circuits which measure the current absorbed by the motor and give said control signal to make it switch from the full power condition to the partial power condition and vice versa whenever said current reaches pre-established thresholds. One of these circuits supplies partial power to the motor whenever the current it absorbs is too high, which indicates a mechanical overload. Another circuit supplies partial power to the motor whenever the current it absorbs is too low, which indicates no-load operation, so as to prevent overspeed.

REFERENCES:
patent: 3443188 (1969-05-01), Mortimer
patent: 3564372 (1971-02-01), Vogelsberg et al.
patent: 3634874 (1972-01-01), Mason
patent: 4369463 (1983-01-01), Lee
patent: 4392093 (1983-07-01), Paule et al.

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