Parameter Estimation in Sensorless Vector controlled Induction motor Drives

Induction motor drives operating on the sensorless vector control mode are widespread in the industrial sector, owing to the better dynamic performances it provides over the other methods and the significant reduction in cost, mounting space and maintenance it provides due to the lack of encoder. But the method's performance is hugely dependent on the accurate measurement or estimation of motor parameters. This paper deals with the estimation of essential motor parameters for the proper operation of the control mode. It is a combination of standstill and rotational modes to estimate parameters by developing a self-commissioning method for industrial drives using the already existing current sensors and DC voltage sensor such that the estimated parameters can be used for both star and delta connections without any further recalculations and minimal motor name plate data. The paper deals with the verification of sensorless vector control method with the estimated parameters by using simulation results for a 15kW motor. Further hardware results on 5.5kW motor load setup are detailed which further validate the method's effectiveness.