An efficient PMSM high speed drive for electric vehicle application

Abstract

: This paper presents an efficiency optimization for a permanent magnet synchronous motors (PMSM) driven at a high speed range under direct torque control strategy (DTC). This goal needs parameter estimation to hold a new adaptive field weakening control algorithm. For high speeds operating rang a novel adaptive field weakening technique is here performed. The conventional DTC uses a reference flux which is kept constant. In order to improve the motor efficiency when going up to high speeds this later is varying according to operating points. The flux magnitude calculation is sensitive to the stator resistance values. Therefore, it is necessary to compensate this parameter mismatch and variation. An online estimated and tuned stator resistance is done. Simultaneously motor parameters are estimated and the field weakening is then online adjusted. The MRAS estimator analysis is performed and presented up on the POPOV hyperstability condition. Simulation results are given in a way to prove the overall drive and optimization algorithm.