Development ofLow-Voltage, High-Current and High-Frequency Slotless Ultra High-Speed Motor

本研究旨在开发一种超高速马达，使车用增压器与涡轮增压器电气化或混合化。由于汽车应用的需要，需要极其特殊的设计来实现低电压、高电流和高频工作。此外，高功率密度和高效率设计必须符合上述要求。利用基于有限元的电磁分析，原型已经开发，它具有1.5-kW的额定输出功率，3-kW的峰值输出和150,000 r/min的最高转速规格时，与12 V直流电源操作。该型号采用2匝无槽结构，功率密度达到22.2 W/cm 3（额定输出功率），电气效率达到98.1%，达到世界顶级水平。

This study focuses on development of an ultra high-speed motor to make automotive superchargers and turbochargers electrified or hybridized. Extremely special design is required to achieve low-voltage, high-current and high-frequency operation because of the automotive application. In addition, high-power density and high-efficiency design must be consistent with the above requirements. Using FEM based electromagnetic analyses, a prototype has been developed, which has 1.5-kW rated output power, 3-kW peak output and 150,000 r/min top speed specifications when operated with a 12-V DC power supply. This model has achieved the world’s top level power density of 22.2 W/cm3(at the rated output power) as well asthe 98.1 % electrical efficiency by employing a 2-turn slotless configuration.