Solenoid having multistage plunger

Details Solenoid having multistage plunger Solenoid having multistage plunger

1997-09-08

1998-11-10

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335264, 335255, H01F 300

Patent

active

058360018

ABSTRACT:
A solenoid has a multistage telescoping plunger which together produce a single stroke. Each plunger stage has a separate air gap individually associated therewith. As the first air gap closes responsive to movement of a first telescoping plunger stage, a portion of the stator becomes magnetically saturated; however, magnetic material has moved with the first plunger stage in order to bridge the saturated position which switches the flux path to a second air gap via a second of the telescoping plunger stages. An advantage is that the solenoid has a long stroke with a high pulling force on both the initial and the final ends of a continuous stroke formed by the separate movements of the first and second plunger stages.

REFERENCES:
patent: 3665353 (1972-05-01), Campbell
patent: 3890587 (1975-06-01), Field
patent: 4538129 (1985-08-01), Fisher
patent: 5010312 (1991-04-01), Motykiewicz

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