A novel iron-loss-model for permanent magnet synchronous machines in traction applications

Abstract

In this paper, a novel model considering iron losses for calculating synchronous machines is presented. The model is used for a study on a permanent magnet synchronous machine (PMSM) for traction applications. However, the main idea is a general approach and can be transferred to other types of synchronous machines. The introduced iron loss model is implemented as an extension of the calculation method presented in [1] for calculating torque-speed characteristics of permanent magnet synchronous machines. In [1], the iron losses are only included in the calculation of the efficiency map. In this paper, the iron losses are additionally included into the equivalent circuit diagram, taking effect on the current and the voltage of the machine. The main idea is to calculate iron loss resistances based on numerically calculated iron losses from a finite element identification and to add these resistances as new elements to the equivalent circuit diagram. The results of this procedure are compared to measurements of a permanent magnet synchronous machine and to a calculation done without considering iron losses in the equivalent circuit diagram.