Rotary actuator having stationary armature and rotary field

Details Rotary actuator having stationary armature and rotary field Rotary actuator having stationary armature and rotary field

1975-05-15

1976-07-20

Duggan, Donovan F.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335229, 335272, 310 39, 310 67R, H01F 708

Patent

active

039709809

ABSTRACT:
A rotary actuator provides rotation of its rotor over predetermined angles. The rotor is a cylindrical housing in which are cylindrically curved permanently magnetized poles spaced apart at their ends and surrounding a fixed armature. The armature has magnetic arms angularly disposed with respect to each other which define fixed poles. Coils wound on the fixed poles generate magnetic fields when energized to drive the rotor. A holding coil may be provided to hold the rotor stationary when the holding coil is energized. The armature may have two, three or more fixed poles. The actuator can be operated in rotor latching or fail-safe return modes. Fixed stop members may be used to limit angular rotation of the rotor.

REFERENCES:
patent: 3142789 (1964-07-01), Rhodes
patent: 3388273 (1968-06-01), Davis
patent: 3466482 (1969-09-01), Peters
patent: 3479626 (1969-11-01), Silverman et al.
patent: 3671899 (1972-06-01), Clift
patent: 3761851 (1973-09-01), Nelson
patent: 3889219 (1975-06-01), Larner

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