Parameter identification of an inverter-fed induction motor at standstill with a correlation method

Two methods to identify the electrical parameters and the magnetization curve of a voltage source inverter-fed induction motor (IM) at standstill are presented. A special advantage of these methods is that the differences between the reference voltage values and the real phase voltage values caused by the unknown switching times of the PWM-inverter are completely suppressed. Therefore a measurement of the phase voltage is not necessary and the parameters of the induction motor can be estimated with a high accuracy. Thus, no additional hardware is necessary and therefore this identification method is a good solution for use in commercial self-commissioning drives