Speed control apparatus having means for changing reference sign

Details Speed control apparatus having means for changing reference sign Speed control apparatus having means for changing reference sign

1990-08-13

1991-03-19

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318811, 318599, H02P 122

Patent

active

050014072

ABSTRACT:
An apparatus for controlling an operating speed of an electrically controlled device including an electrically operated member. The apparatus includes an error signal generator for generating an error signal indicative of an error between an actual and a target value of the operating speed, a reference signal generator for generating a reference signal, a comparator for generating an output signal based on a result of comparison between the error and reference signals, and an energy control device for controlling an energy supplied to the electrically controlled device by controlling the duty cycle of an electric current applied to the electrically operated member such that the energy varies with the output signal of the comparator. A device is provided for changing the reference signal depending upon a load currently applied to the electrically controlled device.

REFERENCES:
patent: 3624475 (1971-11-01), Smith
patent: 4471276 (1984-09-01), Cudlitz
patent: 4893067 (1990-01-01), Bhagwat et al.

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