Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1986-06-23
1989-07-25
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318811, H02P 541
Patent
active
048517518
ABSTRACT:
An AC power supply circuit for an AC motor having a main winding and an auxiliary winding includes a capacitor between the auxiliary and main windings to produce a signal having a phase related to the deviation of the motor from a desired rpm. A rectifier receives the phase signal to generate an error signal of magnitude related to the deviation of the motor rpm from the desired operating rpm. A pulse width modulator circuit generates a square wave having a variable duty cycle for connection to the motor, the duty cycle being minimum at the desired operating rpm. The pulse width modulator circuit is responsive to the error signal to increase the duty cycle of the square wave as the motor rpm deviates from the desired operation rpm, so that the motor rpm is maintained over a range of power supply voltages and other operating conditions.
REFERENCES:
patent: 3906320 (1975-09-01), Doemen
patent: 4006391 (1977-02-01), Deering et al.
patent: 4078192 (1978-03-01), Fultz
patent: 4300081 (1981-11-01), Van Landingham
patent: 4465961 (1984-08-01), Landino
patent: 4642535 (1987-02-01), Hucker
Aviation Instrument Manufacturing Corp.
Ro Bentsu
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