A study on the design of an outer rotor and spoke type PMSM for improving power density

Abstract

Object: This paper proposes an outer rotor and spoke-type permanent magnet synchronous motor (outer rotor spoke-type PMSM) to increase the power density compared to the inner rotor spoke-type permanent magnet synchronous motor(inner rotor spoke-type PMSM) used in washing machines. Method: In order to investigate the output characteristics of the Outer Rotor Spoke-type PMSM, comparison and analysis were conducted on three models of 16-poles/9-slots, 20-pole/9-slots and 22-poles/9-slots. Compare models were conducted with the limited condition which applies the same current density, phase voltage limit, and stator. The final model was optimized based on the model with the best output characteristics among three compare models. Conclusion: Finally, output characteristics are compared between compare models and the final model.