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Induction Motor and Torque behaviour

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chaitanyab

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Hi,

I am simulating induction motor in MATLAB, I am just connecting 3 phase AC supply to the Motor and applying torque. I found out in the results that the torque varies with supply voltage and many times it is going higher than what I am applying, is that correct behavior? practically is that possible?

Regards,

CB Motor.jpg
 

Which quantity are you observing? Te?

YES, I was assuming it is same as Tm, why there are Two torques? Tm and Te what is the difference? can Te become higher than Tm? how to observe Tm? what is the relation ship between Te and Tm? thanks.
 

I'm not using the power electronics toolbox and not familiar with the details, but a cursory look at the documentation clarifies that Tm ("mechanical") and Te ("electrical") are not the same.

Studying the model design and relation of the different state variables should show why you observe the motor behavior as you do.
 

Search " asynchronous machine-mathworks". Down near the bottom of the page it has a section labeled Limatations. It says to add a parasitic load to prevent numerical oscillations. I wonder if this might be what your seeing. Hope this helps.
 

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