Eddy-Current Loss Modeling for Induction Motor with a Form-Wound Stator Winding

摘要

The eddy-current in the form-wound multi-conductor stator winding of a 1250-kW cage induction motor (form-wound IM) was modeled by using time-discretized finite-element analysis (FEA). The voltages and currents from the FEA simulation are used to estimate the equivalent circuit parameters instead of measuring those of the real motor. The traditional T-equivalent circuit is not enough to take the eddy-current effect of the motor with a form-wound multi-conductor stator winding into account. Additional circuit branches are necessary to obtain an appropriate circuit for the form-wound IM. The parameters of the circuit are estimated by using a numerical approach and used to determine the eddy-current losses of the motor. The losses and torque calculated from the circuit are compared to those of the time-discretized FEA to verify the feasibility of the circuit model.