Development and Performance of High-Speed SPM Synchronous Machine

This paper presents a performance evaluation for a 250 kW - 20,000 min^-1 high-speed permanent magnet (PM) motor for high-speed applications such as industrial blowers and compressors. The utilization of a high-speed motor for a direct drive system can contribute to making the system size more compact when compared to a geared system. However, this could cause the motor loss density to be high due to the high output power density in the high-speed motor. At this time, we evaluated the electrical characteristics and efficiency of the prototype 250 kW - 20,000 min^-1 high-speed PM motor and measured the temperature increase by carrying out a heat run test. Furthermore, loss separation was performed to improve the efficiency and design accuracy.

I. Introduction

Permanent magnet (PM) synchronous motors have been widely used in various industrial applications due to their compact size and high efficiency [1], [2]. For high-speed applications such as industrial blowers and compressors, we have developed a 250 kW – 20,000 min⁻¹ high-speed PM motor using an active magnetic bearing (AMB) [18]–[21].