由高速驱动电机与压气机组成的电动增压系统，空气经系统压缩进气缸参与燃烧以提升动力输出。但高速电机的高损耗密度和高频特性会引起永磁体高温退磁和绕组阻感变化，不利于系统长时间稳定工作。基于受阻感影响小的基波／三次谐波磁链复合信号设计了新型高速电机无位置控制策略。同时在电机设计时将提升三次谐波信噪比，减小转子径向力和涡流损耗作为优化目标，对极弧系数等电机结构参数进行了设计优化。采用三维温度场方法分析电机温升，发现不同阶段热量传播路径存在不同。样机性能实验显示系统负载运行动态响应迅速，有效降低动力迟滞；温升实验结果表明热平衡时永磁体温度远低于极限温度，可靠性提升；亦验证了热量传播路径的观点。%The electric supercharger system which is decoupled from the combust engine naturally, is composed of a high⁃speed brushless DC motor and a compressor. However the high loss density of high⁃speed motor would cause the heat concentration and demagnetization, also the resistance⁃inductance of winding is liable to get affected by high frequency, which generates commutation errors. In this paper, a novel sensorless control consisted of funda⁃mental and 3rd harmonic flux is proposed. Simultaneously, rising the signal⁃to⁃noise ratio of 3rd harmonic flux, re⁃ducing the radial force of rotor and decline in motor loss and temperature rising are employed as the conditions, to optimize main parameters such as pole arc to pitch ratio. Three dimensional temperature field calculation method is adopted and heat propagation paths are different in different temperature rising stages is revealed. Performance ex⁃perimental results of load condition indicate that the dynamic response of system is swift. The temperature of perma⁃nent magnet is much lower than the limited temperature, the view of heat propagation path is also verified.
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