Parameter Estimation of Vsi Fed Permanent Magnet Synchronous Motor by Using Hartley Modulating Function

This paper discusses modeling and parameter estimation of PMSM. The design of a control system for a high performance drive requires a mathematical model of the motor. This is usually derived from physical principles, then the parameters of the motor are determined through off-line testing or estimated on-line from input/output operating records data. The dynamics of synchronous motor can be described by a set of differential equations relating voltages, currents, speed and torque. The equations represented in d-q axes variables in the rotor reference frame using park’s transformation are presented. A parameter estimation technique employing the Hartley modulating function (HMF) is detailed. Using the data obtained from open loop simulation physical parameters such as stator resistance and inductances as well as mechanical parameters such as moment of inertia and viscous friction coefficient have been estimated with a fair amount of accuracy. This estimate has been found to be quite sensitive to the choice of sampling period.