Variable reluctance actuators having improved constant force con

Details Variable reluctance actuators having improved constant force con Variable reluctance actuators having improved constant force con

1985-07-08

1987-04-07

Duggan, Donovan F.

Electricity: motive power systems

Linear-movement motors

310 14, 361154, H02K 4100

Patent

active

046564004

ABSTRACT:
A variable reluctance actuator, of either the linear or rotary type, having a moving element operated by a solenoid, is controlled by a Hall effect sensor signal representative of flux density in the magnetic circuit of the actuator. The actuator may be operated in either a constant-force control mode, or a position-sensing or control mode. Substantially constant force, independent of position of the actuator's movable element, is obtained by varying, rather than stabilizing, the sensed magnetic field during movement. Position sensing, independent of actuator force, is obtained by variably controlling the magnitude of the excitation current of the Hall effect sensor in response to the magnitude of the coil current and Hall sensor output.

REFERENCES:
patent: 3413457 (1968-11-01), Wieder
patent: 3671814 (1972-06-01), Dick
patent: 3857081 (1974-12-01), Gebelein, Jr.
patent: 4434450 (1984-02-01), Gareis
patent: 4450427 (1984-05-01), Gareis
U.S. Patent Application Serial No. 639,187, filed Aug. 9, 1984, Joseph J. Stupak, Jr.

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