Measurement and analysis of hysteresis torque in a high-speed induction machine

Hysteresis torque is analysed in a high-speed induction machine where the rotor is solid and made of a semihard magnetic material. The hysteresis torque is investigated at first with no load and experimental and numerical methods are considered. The analysis of hysteresis torque is then extended to rated conditions. The numerical modelling is conducted with accurate Preisach hysteresis models coupled with the finite-element method. The hysteresis torque is found to be relatively significant and represents 8% of the rated torque of the studied machine.