Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1978-03-27
1980-08-26
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318592, 318603, 318692, G05B 1118
Patent
active
042197660
ABSTRACT:
A dual mode servo-system providing improved motion characteristics and improved noise immunity. A relatively movable member is driven by control signals derived from actual velocity feedback signals during coarse mode operation. At the beginning of fine mode operation the actual velocity signal is sampled and used to generate a synthetic velocity signal used to control motion of the member during final deceleration, along with an actual position feedback signal, the synthetic velocity signal having a decreasing magnitude tailored to a particular application. At a predetermined maximum time period, after detent of the member, a time out circuit re-inserts the actual velocity feedback signal.
Control signals for the driven member are also derived from the actual motor current by integrating the motor current, the integrated current signals being used to control motion of the member during coarse mode operation only. During fine mode operation, the member is controlled by an actual position feedback signal and an actual velocity signal derived from the position signal.
REFERENCES:
patent: 3736485 (1973-05-01), Scarrott et al.
patent: 3739158 (1973-06-01), Woodward
patent: 3828168 (1974-08-01), O'Callaghan
patent: 3976929 (1976-08-01), Rodier
patent: 4006394 (1977-02-01), Cuda et al.
patent: 4021714 (1977-05-01), Jones et al.
patent: 4031443 (1977-06-01), Droux
Dobeck B.
Kristofferson Thomas E.
Qume Corporation
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