Method and apparatus for determining the position of an armature

Details Method and apparatus for determining the position of an armature Method and apparatus for determining the position of an armature

1995-06-07

1996-11-26

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420724, G01B 714, G01R 2726

Patent

active

055789048

ABSTRACT:
An apparatus for determining the position of an armature of an electromagnetic actuator having a coil, the armature being movable to and between first and second positions in response to a current flowing in the coil. The apparatus includes circuitry for measuring the magnitude of current in the coil and producing a magnitude signal, measuring the rate of change of current in the coil and producing a rate of change signal, and measuring the derivative of flux linkage versus current in the coil in response to the rate of change signal and producing a flux linkage signal. The apparatus additionally includes circuitry for determining the position of the armature with respect to the coil in response to the magnitude and flux linkage signals.

REFERENCES:
patent: 5424637 (1995-06-01), Ouyden et al.

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