Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1982-11-17
1985-01-29
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318600, G05B 2302
Patent
active
044968892
ABSTRACT:
A method of diagnosing a servomotor position control circuit which includes a pulse distributor for carrying out arithmetic operations for pulse distribution based on command data given by a control unit, a position detector for generating a positional pulse each time the servomotor rotates through a predetermined angular interval, an error storage unit for computing and storing the difference between the number of positional pulses generated by the position detector and the number of distributed pulses generated by the pulse distributor, and a D/A converter for converting the difference into an analog output, whereby the servomotor is controlled by the analog output from the D/A converter. The method comprises the steps of supplying a numerical value from the control unit to the pulse distributor to enable the latter to effect the arithmetic operations while the servomotor is being de-energized, reading a stored content of the error storage unit, supplied with the distributed pulses from the pulse distributor, into the control unit, and checking the servomotor position control circuit for normal and malfunctioning conditions by comparing the stored content as read by the control unit with the numerical value.
REFERENCES:
patent: 3576979 (1971-05-01), McCall
patent: 3633087 (1972-01-01), Vawter et al.
patent: 3934185 (1976-01-01), Schoonover et al.
patent: 4130787 (1978-12-01), Allaire et al.
patent: 4268783 (1981-05-01), Murray
patent: 4272711 (1981-06-01), Fukuyama et al.
Fukuyama Hiroomi
Isobe Shin-ichi
Dobeck B.
Fanuc Ltd.
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