PLL motor controller

Details PLL motor controller PLL motor controller

1986-08-13

1988-04-19

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318603, G05B 102

Patent

active

047392371

ABSTRACT:
A PLL motor controller in accordance with the present invention comprises a driving system for driving a motor, a reference frequency generator for generating pulses with reference frequency that corresponds to the speed of motor rotation to be set, a counter which is run freely at the reference frequency from the reference frequency generator, a pulse generator for generating sampling pulses with a timing that responds to the actual rotation speed of the motor based on the pickup signal from the driving system, a latch circuit for latching a digital information in the counter at the timing of sending the sampling pulses from the pulse generator, and a D/A converter for analog-converting the digital information in the counter that is latched and for supplying the result to the driving system. The driving system is constructed so as to drive the motor to be rotated with a set speed of rotation according to the error signal from the D/A converter.

REFERENCES:
patent: 3989931 (1976-11-01), Phillips
patent: 4002962 (1977-01-01), Miller
patent: 4278925 (1981-07-01), Minakuchi
patent: 4500822 (1985-02-01), Tajima et al.
patent: 4543516 (1985-09-01), Kobori et al.
Patent Abstracts of Japan, vol. 8, No. 190, No. 59-80178; 9-5-1984.

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