System for controlling the speed of an electric motor

Details System for controlling the speed of an electric motor System for controlling the speed of an electric motor

1986-02-04

1986-12-23

Dobeck, B.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318327, G05B 1928

Patent

active

046314628

ABSTRACT:
A system for controlling the speed of an electric motor (12) comprises two counters (1 and 2) which receive counting pulses from an oscillator (5) and control pulses from a tachogenerator (11). The first counter (1) is reset by a tacho-pulse and counts to a predetermined maximum value. The counting direction of the second counter (2) is reversed both when a tacho-pulse appears and when the predetermined fixed value is reached by the first counter (1). A control signal for the motor is obtained by comparing the count of the second counter (2) with a reference value (R) by means of a comparator (14) to derive an on-off signal.

REFERENCES:
patent: 3950682 (1976-04-01), Dohanich, Jr.
patent: 4376914 (1983-03-01), Kimura
patent: 4562394 (1985-12-01), Itoh

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