Digitalized position control for a D.C. motor

Details Digitalized position control for a D.C. motor Digitalized position control for a D.C. motor

1984-05-31

1986-05-13

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Multiple mode systems

318602, 318603, 318599, G05B 1118

Patent

active

045889368

ABSTRACT:
A D.C. motor position control system operates either in the motor speed detection mode or in the motor position detection mode. A rotary encoder develops an approximate sinusoidal position indicating analog signal in response to the rotation of the D.C. motor. A waveform shaping circuit receives the approximate sinusoidal position indicating analog signal and develops a rectangular position indicating digital signal to a phase comparator which compares the phase of the rectangular position indicating digital signal with the phase of a speed instructing pulse signal so as to control the motor speed in a phase-locked-loop (PLL) manner in the motor speed detection mode. A slice level determination circuit divides the voltage level of the approximate sinusoidal position indicating analog signal into 16 (sixteen) degrees to obtain a sliced position indicating digital signal which is used to control the motor position in the motor position detection mode.

REFERENCES:
patent: 3686547 (1972-08-01), Kelling
patent: 3786333 (1974-01-01), Sommeria
patent: 3932796 (1976-01-01), Kreithen et al.
patent: 4021714 (1977-05-01), Jones
patent: 4221998 (1980-09-01), Haught
patent: 4355273 (1982-10-01), DuVall
patent: 4423365 (1983-12-01), Turner
patent: 4429267 (1984-01-01), Veale
patent: 4486693 (1984-12-01), Hamati et al.
patent: 4511830 (1985-04-01), Yamada et al.

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