Variable magnetic field coupling circuit and rotary transducer u

Details Variable magnetic field coupling circuit and rotary transducer u Variable magnetic field coupling circuit and rotary transducer u

1985-06-17

1986-09-09

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

73773, 336120, H01F 2300, G01L 310

Patent

active

046101683

ABSTRACT:
An improved rotary transducer (60) featuring a rotary member (2) rotatably mounted in a housing (4). Member (2) is preferably provided with a section (8) adapted to enhance measurement of stresses or other parameters of interest imposed upon member (2) under operating conditions preferably by means of one or more strain gages (32) forming one or more legs of a wheatstone bridge preferably mounted on member (2). Excitation voltage for the wheatstone bridge and/or the output voltage therefrom is delivered across an electromagnetic field between a magnetic stator member (16) fixed to housing (4) and a rotor member (18) secured to member (2). Stator member (16) comprises two magnetic stator members (34, 34') having respective asymmetrical facing surface portions adapted such that selective rotation of one relative to the other changes the configuration of an air gap therebetween within which rotor member 18 rotates and thereby changes the electrical reluctance of the magnetic coupling field between rotor member 18 and stator members (34, 34' ) to provide control over the magnetic coupling field and the excitation voltage or signal being transferred thereacross.

REFERENCES:
patent: 3519969 (1970-07-01), Hoffman
patent: 3717029 (1973-02-01), Tveter

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