Method and apparatus therefor in motor speed control

Details Method and apparatus therefor in motor speed control Method and apparatus therefor in motor speed control

1986-01-31

1987-01-20

Dobeck, Benjamin

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345E, H02P 506

Patent

active

046382259

ABSTRACT:
A pulse width control apparatus and method for controlling motor speed wherein the number of pulses relating to more speed feedback data is counted so as to control the speed of the motor in accordance with a speed command data and a pulse width modulation signal based on the counted number of pulses. A free-running hardware timer and a soft-timer on a program controlled by an instruction execution time of a microcomputer are arranged so that ON-time data and OFF-time data of the pulse width modulation signal are selectively set in one and the other of the hardware and soft-timers in dependence on values of the ON and OFF times, respectively. The ON and OFF states of the pulse width modulation signal are changed when the contents of the hardware and soft-timers reach predetermined values so as to control the pulse width thereof.

REFERENCES:
patent: 4090115 (1978-05-01), Franz
patent: 4201936 (1980-05-01), Roumanis
patent: 4263557 (1981-04-01), Jarvinen
patent: 4346434 (1982-08-01), Morinaga
patent: 4409534 (1983-10-01), Bose
patent: 4413212 (1983-11-01), Okamoto et al.

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