Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1985-10-11
1987-05-26
Miller, Charles D.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318603, 318327, 318 85, 318 7, G05B 102
Patent
active
046689001
ABSTRACT:
A digital servo apparatus according to the present invention latches a count output of a counter (11) for counting reference clock signals in response to output of a speed detecting pulse from a speed detecting pulse generator (10a) in a latch circuit (141), thereby to latch the count output latched in the latch circuit (141) in another latch circuit (142) upon output of a subsequent speed detecting pulse. The digital servo apparatus further latches the count output of the counter (11) in a latch circuit (16) in response to output of a phase detecting pulse from a phase detecting pulse generator (10b). A comparator (15) compares difference between the count outputs latched in the latch circuits (141) and (142), so that the compared output difference and the count output latched in the latch circuit (16) are converted into analog signals to be sampled and held respectively thereby to produce a speed error signal and a phase error signal, which are added up to be supplied to a driving circuit (22). On the basis of the speed error signal and the phase error signal, the driving circuit (22) controls the speed and phase of a motor (10). Thus, only one counter (11) may be provided for producing the speed error signal and the phase error signal.
REFERENCES:
patent: 4270077 (1981-05-01), Swartz
patent: 4371921 (1983-02-01), Cushman
patent: 4498034 (1985-02-01), Shirakawa
patent: 4500822 (1985-02-01), Tajima
patent: 4514671 (1985-04-01), Louth
patent: 4536806 (1985-08-01), Louth
patent: 4584507 (1986-04-01), Taylor
Keane Patrick C.
Miller Charles D.
Sanyo Electric Co,. Ltd.
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