Auto tuning of parameters and magnetization curve of an induction motor at standstill

Abstract

Determination of motor parameters using the conventional no-load and locked-rotor tests are not applicable in many situations due to the difficulty in removing the mechanical load. In this paper, an off-line parameter auto-tuning method for an induction motor at standstill using a PWM inverter is investigated. Each parameter of the motor including the magnetization curve are identified by the injection of an appropriate stator voltage or current of a predetermined pattern whilst the motor is kept at standstill. The dead-time effect and device voltage drop are taken into consideration in the identification procedure. Also the recursive least-square algorithm is adopted in the calculation to reduce the effect of noises.