Modeling and Analysis of Induction Machines Containing Space Harmonics Part III: Three-Phase Cage Rotor Induction Machines

This part of the paper deals with the application of the general model and equations derived in Parts I and II to the common three-phase, cage rotor induction machines. It describes the procedure used to identify the significant harmonics for a reasonable representation with a low order model. The effects of MIF harmonics on the steady-state and transient behaviors of three sample cage rotor induction machines that have rotors designed to give varying amounts of asynchronous and synchronous torques are examined. Skin effect, skewing of rotor bars, and the influence of slot opening on the MMF are all taken into account in the derivation of the parameters for-these machines. The computational requirement for the solution of the original phase equations is compared with those for the solution of the a-P and d-q component equations.