Eddy-Current Losses in the Stator Winding of Cage Induction Motors

摘要

Coupled Finite Element Method - electric circuit analysis is carried out for estimation of the power losses in cage induction motor when taking into account the eddy currents in the stator winding. For this purpose existing code for time-dependent analysis of cage induction motors has been developed introducing adequate mesh generation of the conductors in the stator slot and adding equations for each conductor of the stator winding. The technique has been applied to analyze 355 kW cage induction motor under different conditions: sinusoidal supply voltage for loaded and nonloaded motor and nonsinusoidal supply voltage from frequency converter for loaded motor. The results have been compared with those obtained assuming constant current density in the stator winding.