Pulse width modulation speed control

Details Pulse width modulation speed control Pulse width modulation speed control

1980-12-11

1983-02-01

Truhe, J. V.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 318327, 318329, 318345E, H02P 506

Patent

active

043718191

ABSTRACT:
A pulse width modulation (PWM) speed control for a DC electric motor includes an encoder for providing encoder pulses in reponse to incremental rotation of a shaft driven by the motor. A timer senses a time period between encoder pulses. After three consecutive sensed time periods, a microcomputer compares the sensed time periods with a desired time period corresponding to a desired motor speed, and provides a digital value which is a function of the comparison of the sensed and desired time periods. The ditigal value is supplied to a timer, which applies an energizing pulse to the DC motor for an interval which is a function of the digital value.

REFERENCES:
patent: 4066941 (1978-01-01), Foster
patent: 4078192 (1978-03-01), Fultz
patent: 4153863 (1979-05-01), Schachte et al.
patent: 4258300 (1981-03-01), Fromont
patent: 4260936 (1981-04-01), Sun
patent: 4278924 (1981-07-01), Mawatari et al.
patent: 4280082 (1981-07-01), Acharya et al.
patent: 4298832 (1981-11-01), Acker et al.
"Microprocessor-Based Controller", by Y. T. Chan et al., IEEE vol. IECI-27, No. 3, Aug. 1980, pp. 169-176.

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