The permanent magnet synchronous motor (PMSM) is a frequent choice for battery electric vehicle (BEV) traction purposes. In order to cover torque demand of common drive cycles with single gear transmission, a very wide field weakening operation range is necessary. This paper introduces a modified per unit system description, which takes advantage of a novel definition of base quantities. The presented method allows easy assessment of PMSM drive torque curve shape in the field weakening region based on only two variables, i.e., the drive characteristic factor and the electrical machine saliency factor. These two factors are also sufficient to describe all qualitatively different torque vs. speed curve shapes, which can be achieved using PMSM variable speed drives. It is a well known fact that the motor power factor affects inverter power rating and its current demand. The presented approach links this dependency with a particular qualitative drive torque vs. speed curve shape. It allows further to predict machine equivalent circuit parameters and the inverter power rating for every feasible torque vs. speed curve shape meeting particular application requirements. This method provides then an analytical basis for preliminary system design and dimensioning.
Per Unit Approach Based Assessment of Torque Production Capability of PMSMs Operating in the Field Weakening Region
2019-05-01
757765 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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