A study on determination of parameters for permanent magnet synchronous machine by comparing load tests and Finite Element Analysis

This paper presents a comparison between results, for two methods of obtaining the values of "d-axis" synchronous reactance X_sd and "q-axis" synchronous reactance X_sq, of the permanent magnet synchronous motor with radial magnets (RPMSM). The paper provides a background describing the benefits of using the RPMSM machine and how the synchronous reactance parameters are valuable in determining stability and control algorithms for the machine. The two methods described are a load test under constant frequency conditions and Finite Element Analysis (FEA). Results obtained from the load tests, including the internal load angle δ, have been used to calculate X_sd and X_sq and represent their values with respect to the armature current and internal angle δ. Comparative results have been extracted using FEA. Good agreement between results is illustrated. Future developments conclude the paper.