Hello, I am trying to estimate the stator resistance of an induction motor (online) by using back emf of stator quantities and the rotor quantities respectively and a PI compensator. The problem that i am facing is that as the operating conditions ( as increase / decrease in speed or increase / decrease in load torque ) the value of resistance varies from (0 to 15 ohms)? Can i get any suggestions how to estimate the stator resistance?
Thanks in advance
No, the stator resistance does not vary!
What you might experience (due to your statement about variation depending on motor speed) is the influence of the inductance resp. back EMF. The stator resistance can be measured with an ohmmeter while the motor is not connected to the grid.
Your motor seems to be quite big with a measured resistance of 0 Ohms (when standing still).
Hope this helps...
Are you sure that you are talking about stator (dc) resistance and not about the motor equivalent resistance (impedance) measured from the stator side during the motor preration. The motor equivalent impedanse (resistance) is changing with a speed.
yes its about the stator resistance not the motor equivalent resistance
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