Computation of inductances of the brushless doubly-fed machine

For the purpose of accurate calculation of differential inductances in brushless doubly-fed machine, an improved energy perturbation method is proposed based on conventional finite-element energy perturbation method. The new method may greatly decrease the number of times to solve nonlinear equations and have some other advantages, such as only employing first derivation and direct calculating the increment of energy perturbation. The experimental results on a test motor in comparison to the values calculated show that the proposed method, with higher computing efficiency and accuracy, are practically suitable for inductances calculation of brushless doubly-fed machine. © 2009 Chin. Soc. for Elec. Eng.