Variable force linear actuator

Details Variable force linear actuator Variable force linear actuator

1986-04-29

1987-10-06

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335223, H01F 708

Patent

active

046986081

ABSTRACT:
A linear electromechanical actuator having a variable drive force. The actuator includes a moving coil which moves along a stroke path in response to an input current. A magnetic circuit provides a magnetic flux through which the coil is driven. The flux density along the stroke path is non-uniform, with a higher flux density being present only in that region of the stroke path where a higher actuator drive force is required. Thus, less expensive magnetic material can be used. Since the overall flux density in the magnetic circuit is reduced, the dimensions of the soft iron elements of the magnetic circuit can be reduced without magnetic saturation so as to further reduce construction costs.

REFERENCES:
patent: 3467925 (1969-09-01), Masuda
patent: 3723779 (1973-03-01), Gillum
patent: 3723780 (1973-03-01), Gillum
patent: 3743870 (1973-07-01), Hunt
patent: 3751693 (1973-08-01), Gabor
patent: 3787890 (1974-01-01), Bonny
patent: 3869930 (1975-03-01), Forest

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