Comparison of induction motor FEM simulations fed by measured and reconstructed DTC inverter voltages

A coupled system simulator, based on analytical circuit equations and a finite element method (FEM) model of the motor, is used to analyze a direct-torque-controlled (DTC) frequency-converter-fed industrial 200 kW squirrel-cage induction motor. The measured stator voltage waveforms are used as inputs to the FEM motor model, and the results are compared with the measured ones. Comparison is also made for the simulation results obtained by reconstructed stator voltages. The converter switch states are solved from the measured voltage waveform, and used as inputs of the simulator inverter bridge. The performance of the FEM motor model is analyzed, and the amplitudes of the measured stator current harmonics are kept as references.