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Hallo all
I would like to know how to calculate the inductance ofa
rotor-bar in a Squirrel cage induction motor using FEMM. I thought about using
the block integral for magnetic field energy, and then calculate L from E =
1/2 L I^2. But I do not know what I must do do get the right flux density (which
is neccesary since the inductance will change with B) in the motor without
having the stator currents (which cannot be included if I want to use the
magnetic field energy). I thought to distribute the rotor-bar currents
sinusoidally according to the number of pole-pairs and then use a high
rotor-bar current which will give the right flux distribution in the motor,but
that will make it very difficult to use the method E = 1/2 L I^2. (what value
must I then use for I in the equation)
I also am not sure if one can actually use the above
method to determine the inductance of a rotor-bar.
(What I want to determine eventually, is the angle by which
the bar-current will lag the induced emf in the bar)
I would appreciate any help!
(Sorry that I don't know so much about this field - I am still
an undergraduate student in Engineering)
Ivan Slabbert
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