Method and apparatus for sensing armature position in direct cur

Details Method and apparatus for sensing armature position in direct cur Method and apparatus for sensing armature position in direct cur

1997-10-06

1999-08-24

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420724, 137554, G01B 714, F16K 3700, G01R 2716

Patent

active

059428929

ABSTRACT:
An apparatus detects a position of an armature within a solenoid coil by superimposing a fixed frequency sensing signal onto the coil driver signal. The combined signal is applied to the solenoid coil and an alternating current component varies with changes in inductance of the solenoid coil that result from position changes of the armature. A current sensor produces an output signal indicating a level of current flowing through the solenoid coil and a filter extracts the alternating component of that output signal that results from the sensing signal. A position circuit determines the position of the armature from an output from the filter.

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