Force motor with null centering and null position bias

Details Force motor with null centering and null position bias Force motor with null centering and null position bias

Filed on

1983-04-28

Date issued

1985-03-26

Examiner

Duggan, Donovan F.

Patent Class

Electricity: magnetically operated switches, magnets, and electr

SubClass

Magnets and electromagnets

SubSubClass

With magneto-mechanical motive device

Other Related Categories

335229, 310 36, 310 86, H01F 708

Type

Patent

Status

active

Patent number

045076340

Description

ABSTRACT:
Motor includes an internal torsion spring which provides for null centering of the rotor assembly while minimizing bearing load reactions and related friction. Two such centering springs may be provided whereby in the event one spring should fail, the other spring will still be operative to perform the desired null centering function. Also, an internal leaf spring interiorly of the rotor casing absorbs the full stroke rotor inertia without part damage or deformation. The null position bias of a motor driven valve may be established by adjustment of a pair of set screws which adjust the rotor assembly off null without inducing undesirable friction. The stator electrical torque null of the motor may also be set by providing an adjustable eccentric pin in the stator housing which is engageable in a notch in the rotor casing.

REFERENCES:
patent: 3164733 (1965-01-01), Molitor
patent: 3229170 (1966-01-01), Daugherty et al.
patent: 3435393 (1969-03-01), Meisel
patent: 3474313 (1969-10-01), Lucien
patent: 3486148 (1969-12-01), Christensen
patent: 3587016 (1971-06-01), Coakley
patent: 3644763 (1972-02-01), Skrobisch
patent: 3911300 (1975-10-01), Lebkuchner
patent: 4164722 (1979-08-01), Garvey
patent: 4282502 (1981-08-01), Nicholson
patent: 4329672 (1982-05-01), Stahl et al.
patent: 4345228 (1982-08-01), Idogaki et al.
patent: 4403204 (1983-09-01), Crawshaw et al.

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