Variable speed control for a brushless direct current motor

Details Variable speed control for a brushless direct current motor Variable speed control for a brushless direct current motor

1985-06-03

1986-07-29

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

046032835

ABSTRACT:
A variable speed control for an encoderless, brushless, direct current motor. An input signal, representing a desired speed of the motor, is received by both a variable power supply and a counter. The counter responsively issues a sequence of signals corresponding to particular motor windings to be energized. The variable power supply issues a motor supply voltage in accordance with the input signal as well. An error corrector circuit is connected to both the counter and the windings of the motor. The corrector circuit senses a voltage waveform on a winding when the counter signal indicates that the winding is not energized. If the winding voltage waveform deviates from a predetermined standard, the corrector circuit gives a correction command to the variable power supply. The variable power supply accordingly increases or decreases the motor supply voltage.

REFERENCES:
patent: 3581173 (1971-05-01), Hood
patent: 3783357 (1974-01-01), Ichiyanage
patent: 3795848 (1974-03-01), Schaub
patent: 3997823 (1976-12-01), Machida
patent: 4107595 (1978-08-01), Campe
patent: 4162435 (1979-07-01), Wright
patent: 4169990 (1979-10-01), Lerdman
patent: 4229682 (1980-10-01), Goddijn
patent: 4233548 (1980-11-01), Kirtley, Jr.
patent: 4262237 (1981-04-01), Gelenius
patent: 4403177 (1983-09-01), Weber

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