PROJECT TITLE :

Improved Design of IPMSM for Sensorless Drive With Absolute Rotor Position Estimation Capability

ABSTRACT:

In this paper, two styles of interior permanent-magnet synchronous machine (IPMSM) for sensorless drive with absolute rotor position estimation capability are proposed. A conventional IPMSM design proposed for the same purpose had a demerit that for the absolute position estimation, the rotor ought to initially stroke for 100 degrees in the worst case. Using the proposed IPMSMs that includes uneven winding and uneven rotor geometry, the initial stroke of the rotor can be reduced to 30 degrees. Moreover, basic characteristics of the motor like torque ripples and harmonics of electromotive force (EMF) are conspicuously improved. The proposed designs are evaluated by rigorous finite-part analyses and experimental tests. An analytical model of the proposed motors considering their asymmetric structures is additionally developed and provided during this paper.