SIMULATION OF SATURATED DOUBLE-CAGE INDUCTION MACHINES

Abstract

ABSTRACT By using space-vector theory the effects of saturation of the main and leakage flux paths are incorporated into various transient models of a double-cage induction machine. The first two models utilize the currents as the state-variables and the equations are expressed in the stationary and synchronously rotating reference frames respectively. These models also incorporate the effects of cross-magnetization. The new terms in the impedance matrices are caused by main and leakage flux saturation and depend on both the position and the modulus of the appropriate space vector of currents. The third model which uses the flux linkages as the state-variables is simpler than the first two, but it conceals the effects of cross-magnetization and also some other effects due to saturation. The fourth model also uses the flux linkages as state-variables, but the equations are formulated in a special reference frame and it is suitable for application in a drive employing magnetizing-flux-oriented control. Results of digital computer simulations are also presented