Motor speed control arrangement

Details Motor speed control arrangement Motor speed control arrangement

1984-09-26

1986-04-22

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, 318317, 318341, 318326, H02P 500, H02P 540

Patent

active

045845077

ABSTRACT:
A variable motor speed control arrangement of the tachogenerator feedback loop type comprises a triac (5) connected in series with the motor (M). The triac is fired in each half cycle of the AC mains supply. The firing angle of the triac is varied to provide the required control. The arrangement employs a single cycling counter (CT) to time the interval between two output pulses of the tachogenerator (T) in order to determine the current motor speed and also to provide a count-down from the beginning of each half cycle to the required firing instant. The control processes are carried out in periods beginning at each counter overflow instant. This breaking up of the processing, together with the use of the single counter allows a microcomputer (1), which is running other programs to provide the speed control in addition.

REFERENCES:
patent: 4054820 (1977-10-01), Foster
patent: 4216419 (1980-08-01), Van Dam et al.
patent: 4254367 (1981-03-01), Sakamoto
patent: 4287458 (1981-09-01), Nakamura et al.
patent: 4311949 (1982-01-01), Pelkmann et al.
patent: 4323832 (1982-04-01), Okamura
patent: 4371819 (1983-02-01), Kaufmann
patent: 4427933 (1984-01-01), Wagener et al.
patent: 4479078 (1984-10-01), Kidd et al.

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