rotor time constant or magnetizing inductance identification
rotor time constant or magnetizing inductance identification
(OP)
I need to find an induction motor's rotor time constant or magnetizing inductance (Lm) via inverter and while motor is at standstill. One way which i know is using bemf. But this method requires transient voltage measurement and the filter attached to the sensor doesn't allow to measure this transient and damps it. Are there any other methods to find either of them?





RE: rotor time constant or magnetizing inductance identification
So your filter will not influnce your measurement at all. Just go on measure!
Gunnar Englund
www.gke.org
RE: rotor time constant or magnetizing inductance identification
RE: rotor time constant or magnetizing inductance identification
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RE: rotor time constant or magnetizing inductance identification
RE: rotor time constant or magnetizing inductance identification
Rotor current decays proportional to Lrotor/Rrotor.
Stator voltage is proportional to rate of change of rotor current. Characteristic of exp(-t*L/R) is the derivative is still proportional to exp(-t*L/R).
How this Lrotor would related to equivalent circuit parameter rotor leakage inductance L2 = X2/(2*pi*f) I'm not sure. I would think it would be a different parameter. Leakage inductance relates to flux not linked from rotor current to stator current. No stator current in this experiment so now way to tell what's linked or not.
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RE: rotor time constant or magnetizing inductance identification