Rotation control system

Details Rotation control system Rotation control system

1977-07-25

1978-09-12

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 318327, H02P 516

Patent

active

041140753

ABSTRACT:
Rotation of a rotary machine, e.g. a dc motor is controlled with higher accuracy by the system comprising a rotation speed detector for generating a signal having a repetition frequency dependent on the rotation speed of the rotary machine, a phase comparator having two input terminals one of which is applied with the output signal of the rotation speed detector, a voltage controlled oscillator applied with the output signal of the phase comparator, a frequency divider applied with the output of the voltage controlled oscillator and supplying the output to the other input terminal of said phase comparator, and a rotation speed controlling circuit having an input terminal applied with the output of the voltage controlled oscillator, i.e. a detection signal with a multiplied frequency.

REFERENCES:
patent: 3215918 (1965-11-01), Lichowski
patent: 3970909 (1976-07-01), Minakuchi

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