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Finite element modeling of the magnetizing inductance of an induction motor as a function of torque

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3 Author(s)
Nerg, J. ; Dept. of Electr. Eng., Lappeenranta Univ. of Technol., Finland ; Pyrhonen, J. ; Partanen, J.

The torque dependency of the magnetizing inductance of an induction motor is studied. A calculation procedure based on accurate finite element (FE) modeling solution of the air-gap flux linkage to obtain the magnetizing inductance of an induction motor at different load conditions is introduced. Two-dimensional nonlinear time stepping FE analysis is used to calculate the instantaneous rotor and stator currents as well as the flux density distribution in the air-gap. The amplitude of the magnetizing current vector is calculated using the sum magnetomotive forces of the rotor and the stator. The magnetizing inductance is calculated from the air-gap flux linkage and the magnetizing current vector. It is shown that the magnetizing inductance of an induction motor decreases as a function of torque.

Published in:

Magnetics, IEEE Transactions on  (Volume:40 ,  Issue: 4 )