Hi
I’m working with linear switched reluctance actuators. Motor phase inductance parameter change with mover position and phase current. From a finite elements software tool or experimental work, a map of L(i,x) can be obtained.
My idea is to measure the inductance and DC current, in real time, to know where the mover is.
Inductance can be measured using an low level AC signal. The mean value from the signal obtained multiplying the voltage across the inductance by the current advanced by pi/2 give an result proportional to the inductance.
If someone is interested in an more complete explanation please let me know.
Best regards