A comparative investigation and evaluation of different methods for experimental determination of parameters for saturated induction machines with current-displacement rotor

The intention of this work is, in a practical way, to determine the motor parameters of a deep bar induction motor with the purpose to design suitable equivalent circuits and mathematical models that take skin effect and saturation into account. Only in particular cases the T-parameters of a deep bar motor are given by the manufacturer, in most cases the customer has to find a method to determine them. The present report gives a comparison and an evaluation of the results from the following methods: variable speed test; variable frequency test with sinusoidal voltage; and variable frequency test with nonsinusoidal voltage from inverter supply. The methods are discussed on the base of the motors equivalent circuit for harmonic voltage components when a nonsinusoidal voltage is impressed, and losses, saturation and skin effect are taken into account.