Direct drive servovalve with rotary force motor

Details Direct drive servovalve with rotary force motor Direct drive servovalve with rotary force motor

1986-06-27

1988-05-03

Duggan, Donovan F.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

310 29, 310 36, H01F 708

Patent

active

047423226

ABSTRACT:
The limited angle rotary force motor includes an inner pole member having multiple permanent magnets disposed on the exterior thereof and a longitudinal bore in which a rotor shaft is journaled for rotation. An annular low inertia coil assembly is positioned in spaced relation around the permanent magnets by sets of spoke-like arms extending from the rotor shaft through transverse openings in the inner pole means. An annular ferritic stainless steel outer pole sleeve is located in spaced relation around the coil assembly to complete the magnetic circuit and withstand hydraulic system pressure to which the motor components are exposed. The outer pole piece is part of the casing or housing for the servovalve.

REFERENCES:
patent: 2645728 (1953-07-01), Willson et al.
patent: 3118076 (1964-01-01), Held
patent: 3426224 (1969-02-01), Esters
patent: 3591815 (1971-07-01), Grootenhuis
patent: 3845338 (1974-10-01), Fawzy
patent: 4019075 (1977-04-01), Kagami
patent: 4048502 (1978-04-01), Heyraud et al.
patent: 4086508 (1978-04-01), Masamoto et al.
patent: 4398167 (1983-08-01), Dickie
patent: 4507634 (1985-03-01), Vanderlaan
patent: 4530487 (1985-07-01), Tew et al.
patent: 4533891 (1985-08-01), Vanderlaan
patent: 4560967 (1985-12-01), Lindsey

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