Iron Loss Calculation for High-Speed Permanent Magnet Machines Considering Rotating Magnetic Field and Thermal Effects

Abstract

Thanks to their many merits such as high power density and fast dynamic response, the high-speed permanent magnet machines (HSPMMs) have attracted increasing industrial and domestic applications. However, the iron loss may become significantly higher at higher operating speed and frequency and it should be carefully considered in the machine design and analysis. In this paper, an advanced iron loss analytical calculation method is applied for HSPMMs in which the influences of rotating magnetic field and thermal field are both considered. A 30 kW, 45000 r/min HSPMM is studied to demonstrate that the proposed model is feasible and advantageous. Analysis results reveal that the predicted iron loss by using the proposed method has satisfactory accuracy with small errors (maximum error of 3.73% and absolute average error of 3.03%) under different operating conditions. The proposed method can also be applied in other electromagnetic devices such as superconducting electrical machines.