Single phase AC motor speed control system

Details Single phase AC motor speed control system Single phase AC motor speed control system

1993-01-06

1994-01-04

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Reversing

318774, 318817, H02P 528, H02P 5415

Patent

active

052763927

ABSTRACT:
A variable speed control system for a single phase AC induction motor wherein a controllable switch is in series with the main winding of the motor, while the auxiliary winding of the motor, which is in series with a capacitor, is continuously energized. The switch is opened whenever the current through the main winding passes through zero. While the switch is open, the back e.m.f. in the main winding is sensed to provide a measure of the speed of the motor. This is compared with a desired speed signal and the comparison is utilized to control closure of the switch. The speed of the motor then remains constant at the desired speed, even with a varying load.

REFERENCES:
patent: 3740631 (1973-06-01), Fricker et al.
patent: 4455521 (1984-06-01), Day et al.
patent: 4651077 (1987-03-01), Woyski
patent: 5159255 (1992-10-01), Weber

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