摘要：以一台0.6 kW、200 000 r/min的微细切削超高速电主轴内装式永磁无刷直流电机为例，引入等效导热系数，有效地解决了电机定转子之间气隙热交换问题。建立超高速电主轴内装式电机电磁场与温度场二维有限元模型，通过电磁场与温度场的单向耦合，计算了高速电主轴电机额定负载定转子瞬态温度场，分析了转子永磁体和合金钢护套的温度分布，研究了不同材料护套和换热方式对电机温度场分布的影响，对超高速电主轴永磁电机的优化设计具有一定的指导意义。

关键词：高速电主轴；永磁无刷直流电机；温度场；等效导热系数
Abstract: A 0.6 kW, 200 000 r/min ultra fine cutting speed spindle built-in permanent magnet brushless DC motor, for example, the introduction of effective thermal conductivity and effective solution to the air gap between the motor stator and rotor heat exchange problems . Built ultra high-speed spindle motor built-in electromagnetic field and temperature field in two-dimensional finite element model of the electromagnetic field and temperature field through a one-way coupling, calculated the speed spindle motor rated load transient temperature field of the stator and rotor, permanent magnet rotor analysis and alloys steel sheath temperature distribution of different materials, sheathing and heat transfer way of the motor temperature distribution influence on the ultra-high-speed spindle permanent magnet motor optimal design has a certain significance.

Key words: high-speed electric spindle; permanent magnet brushless DC motor; temperature field; effective thermal conductivity