Sensorless measurement of electromagnetic actuator...

Details Sensorless measurement of electromagnetic actuator... Sensorless measurement of electromagnetic actuator...

G - Physics

05

D

G05D 7/06 (2006.01) G01D 5/20 (2006.01) G05D 19/02 (2006.01)

Patent

CA 2143768

This invention pertains to sensorless measurement of electromagnetically induced displacement in actuators and similar units. Primarily, the device imposes a constant frequency and amplitude excitation sine wave on a coil through a fixed impedance of a drive isolation network. The amplitude and phase of the voltage across the coil fluctuate depending upon the coil's inductance. This variation in the value of the inductance is dependent upon the change in magnetic flux density generated by the coil current and the displacement in air gap between the coil pole and armature. Accordingly, a measurable magnitude of displacement can be controllably imposed upon a system of solenoids. The displacement is thus measured and set without the use of extrinsic sensors.

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