Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1994-09-28
1996-12-24
Cabeca, John W.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318678, 318364, G05B 106
Patent
active
055876404
ABSTRACT:
A servomotor control system is set forth that assists in overcoming the problem of servomotor shut down during a failure of the programmable control system and/or servo-amplifier. The presently disclosed servomotor control system includes a programmable control system having one or more output signals connected to control a servo-amplifier. The system further includes a servomotor that is connected for control by the servo-amplifier. A safety switch is connected for detection by the programmable control system, the programmable control system controlling the servo-amplifier to brake the servomotor upon detection of the actuation of the safety switch. A delayed braking apparatus is disposed between the servo-amplifier and the servomotor. The delayed braking mechanism is also connected to detect the actuation of the safety switch, and acts to brake the servomotor after a predetermined time period from the detection of such actuation has lapsed.
REFERENCES:
patent: 4035705 (1977-07-01), Miller
patent: 4065074 (1977-12-01), Anderson et al.
patent: 4250440 (1981-02-01), Lee
patent: 4419973 (1983-12-01), Collonia
patent: 4494199 (1985-01-01), Lehmann
Ek Anders
Hegardt Johan
Burkhart Patrick N.
Cabeca John W.
Tetra Laval Holdings & Finance S.A.
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