Solenoid actuator having a long stroke

Details Solenoid actuator having a long stroke Solenoid actuator having a long stroke

1978-09-25

1980-11-25

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

310 13, 335279, H01F 708

Patent

active

042361303

ABSTRACT:
A solenoid comprises an electric coil having an opening through it and an armature of permeable material having in fixed relative relationship a core passing through the opening of the coil and a sleeve surrounding the coil. The armature is unmagnetized except for magnetization induced by current flow through the coil. The coil and the armature are relatively movable in an axial direction to vary the extent of overlap therebetween. A pole piece of permeable material connects the sleeve to the core at one end. A pole piece of permeable material is fastened to the end of the coil opposite to the first named pole piece. In one embodiment the core is movable relative to the sheath prior to energization of the coil, to permit the coil to be preset to one of two positions in gapless relationship with the sheath.

REFERENCES:
patent: 473538 (1892-04-01), Weston
patent: 901974 (1908-10-01), Lindsey
patent: 1199921 (1916-10-01), Poth
patent: 3070730 (1962-12-01), Gray et al.
patent: 3467925 (1969-09-01), Masuda
patent: 3525963 (1970-08-01), Burdett
patent: 3676758 (1972-07-01), Mathews
patent: 3746937 (1973-07-01), Koike
patent: 3786383 (1974-01-01), Ludwig et al.
Text-Electro Magnetic Devices by Herbert C. Roters, 1941, pp. 238-240 and 317.

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