Controlled force variable reluctance actuator

Details Controlled force variable reluctance actuator Controlled force variable reluctance actuator

H - Electricity

01

F

318/1

H01F 7/18 (2006.01)

Patent

CA 1238082

CONTROLLED FORCE VARIABLE RELUCTANCE ACTUATOR ABSTRACT A controlled force variable reluctance position-sensing 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 den- sity 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 con- trolling its duty cycle, however, continuous control of the current may also be employed. The position of the moving element may be monitored and selectively con- trolled in response to measured electric and magnetic parameters of the actuator. 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.

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