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This paper describes a relationship and compatibility between the mechanical proportion and anti-demagnetization characteristic of an ultra-high-speed permanent magnet (PM) motor of which rated output power is 15 kW and rated speed is 150,000 r/min. The ultrahigh-speed motor must be designed to achieve outstanding electromagnetic characteristics under various server mechanical constraints. In the paper, three motor models having different characteristics of 15 kW, 150,000 r/min are investigated from the viewpoints of electromagnetic and mechanical compatibility. all the motor models designed here achieve high efficiency over 95 %, but it is found that anti-demagnetization characteristics are different among the three. In addition, rotor shaft material is discussed for anti-demagnetization. As a result, stainless steel is found to be a better material than carbon steel for anti-demagnetization.

Study on mechanical proportion and anti-demagnetization characteristic of 15 kW, 150,000 r/min PM motor