Motor speed controlling device capable of correcting for speed d

Details Motor speed controlling device capable of correcting for speed d Motor speed controlling device capable of correcting for speed d

1992-06-17

1993-06-15

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

388902, H02P 700

Patent

active

052202666

ABSTRACT:
A motor speed controlling device controls the rotational speed of a motor by feeding back an actual rotational speed detected by a photocoupler. An encoder disk formed with equi-pitch slits in the periphery thereof is attached to the drive shaft of the motor, and a photocoupler is provided in association with the encoder disk. CPU computes ON duration Ton and OFF duration Toff of pulse trains produced from the photocoupler when the motor is rotating at a constant speed. If the ON duration Ton and OFF duration Toff are unequal, ON correction factor and OFF correction factor are computed based on the measured ON and OFF durations, whereas if the ON duration and OFF duration are equal to each other, the ON and OFF correction factors are set to one (1). The CPU corrects the ON and OFF durations Ton and Toff based on the ON and OFF correction factors.

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patent: 4833588 (1989-05-01), Schauder
patent: 5029263 (1991-07-01), Rozman

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