Actuator retraction circuit

Details Actuator retraction circuit Actuator retraction circuit

1994-06-24

1996-02-27

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318364, 318678, 360 70, 369 32, H02K 710

Patent

active

054951569

ABSTRACT:
Method and apparatus for retracting an actuator comprising determining back emf voltage generated by the actuator motor; applying the determined voltage to a capacitor-resistor network; applying a holding voltage to the capacitor-resistor network. The application of the determined voltage and the holding voltage together charges a capacitor in the capacitor-resistor network to develop a charged capacitor voltage. The method and apparatus further comprises terminating application of the determined voltage to the capacitor-resistor network upon charging of the capacitor, and discharging the capacitor through the capacitor-resistor network to provide a forcing voltage to the actuator for retract operation. The forcing voltage initially forces a high deceleration current in the actuator. Further, the forcing voltage decays with time to a predetermined holding voltage to complete the retract operation.

REFERENCES:
patent: 4104684 (1978-08-01), Wakami et al.
patent: 4682314 (1987-07-01), Nakagaki et al.
patent: 4835754 (1989-05-01), Yamamoto et al.
patent: 4860271 (1989-08-01), Yokogawa et al.
patent: 4885517 (1989-12-01), Pennock
patent: 5150346 (1992-09-01), Minakuchi

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