I am building a circuit, where a MCU will drive an unipolar stepper motor through MOSFETs and constant current source (not included in the schematic).
The MOSFETs will switch at a frequency of somewhere in 10's or 100's kHz square wave. To design a constant current source, I need to measure the inductances of the coils and also their ESR. I have a LCR meter and multimeter at hand, but am unsure of how exactly to measure it.
If I measure the resistance of the coils (L1, L2, L3 or L4) with a multimeter I get around 5.5Ohms, if I do the same with the LCR meter set at 10kHz or 100kHz, I get like 500Ohm and 450uH.
How should I measure inductance and ESR of the coils?