Direct modeling of starting process of skewed induction motors using a multi-slice technique

The starting current and the starting torque are still difficult to evaluate and test precisely. The geometrical features of skewing in the rotor bars also make the simulation particularly difficult. By using a multi-slice technique, a time stepping 2-D eddy-current finite element method to study the starting process of skewed rotor induction machines is described. Since the fields of the multi-slices are coupled together, the eddy current effects can be taken into account directly. The basic formulas for the multi-slice model are derived and shown in this paper. Simulation results from the developed software show very good correlation with test data.