Method for sensing and controlling the position of a variable re

Details Method for sensing and controlling the position of a variable re Method for sensing and controlling the position of a variable re

1984-12-19

1987-05-12

Duggan, Donovan F.

Electricity: motive power systems

Linear-movement motors

361154, 310 14, H02K 4100

Patent

active

046653481

ABSTRACT:
A controlled force variable reluctance actuator. A variable reluctance actuator having a moving element operated by a solenoid is provided in which the current in the solenoid is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced by a Hall effect device placed in the magnetic circuit. Preferably, the Hall effect device controls the current in the solenoid by controlling its duty cycle; however, continuous control of the current may also be employed. Alternative embodiments are provided for a constant force actuator, an actuator whose force-displacement characteristic is altered, and an actuator in which the force may be selectively controlled. An embodiment is also provided for selectively controlling the position of the moving element based upon measured electric and magnetic parameters of the actuator.

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