Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1990-07-31
1992-06-23
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318603, 318606, G05B 1128, H02P 0736
Patent
active
051246236
ABSTRACT:
A speed control circuit for a servo motor for counting frequencies generated in response to a revolution of the servo motor and for converting the frequency to a control voltage of the servo motor, including a controller for receiving a basic clock signal after outputting a latch control signal every period of a frequency generator signal and for outputting a load signal following a period of the basic clock signal, a counter for counting the basic clock signal after loading an initial value once the load signal is output from the controller, a latch for latching the counted value of the counter when the latch control signal is output from the controller, a digital/analog converter for converting the counted value latched to an analog signal a, and a speed error control ouput section for performing buffer amplification on the analog signal and for outputting a as a speed error control signal the buffer amplified analog signal.
REFERENCES:
patent: 3742326 (1973-06-01), Okuda et al.
patent: 4259626 (1981-03-01), Nomura et al.
patent: 4283671 (1981-08-01), Nakano et al.
patent: 4360767 (1982-11-01), Akiyama et al.
patent: 4441061 (1984-04-01), Yoshida et al.
patent: 4885793 (1989-12-01), Tabuchi
Cabeca John W.
Goldstar Co. Ltd.
Shoop Jr. William M.
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