转子风刺对高速永磁电机永磁体温升的抑制作用

Suppression Effect of Rotor Wafters on Permanent Magnet Temperature Rise for High-speed Permanent Magnet Motor

为了研究转子风刺对高速永磁电机内部流体流动与温度分布的影响,以一台15k W,30000r/min的高速永磁电机为例,基于流体力学和传热学理论,建立三维流体场与温度场的求解域模型,并给出基本假设与边界条件,采用有限体积法对流体场与温度场进行耦合求解,得到转子有无风刺时电机内流体流动特性及各部件的温度分布。在此基础上,研究风刺长度、风刺数量变化对流体场及温度场的影响。计算结果表明,选择合适的风刺长度和数量可以有效降低永磁体温升,对提高高速永磁电机的运行可靠性具有一定的参考意义。最后,对一台10k W水冷永磁电机永磁体温升进行了试验,并将试验数据与计算结果进行对比,验证了耦合场计算结果的正确性。

In order to study the influence of rotor wafters on internal fluid flow and temperature distribution for high speed permanent magnet motor（HSPMM）, a 15 kW, 30000r/ min high-speed permanent magnet motor was taken as an example. On the basis of computational fluid dynamics（CFD） and heat transfer theory, the computation model of fluid and temperature field was established, and calculated using finite volume method by giving fundamental assumptions and corresponding boundary conditions. The temperature distribution of each part and air flow characteristics in the motor with and without wafters were obtained. Then, the influence of different wafter length and number on fluid and temperature field were studied. The calculated results show that the temperature rise of permanent magnet is reduced effectively by adding reasonable wafter, which provides certain guidance for improving heat dissipation capacity of HSPMM. At last, temperature rise test for a water-cooling 10 kW permanent magnet motor was conducted, and the test data were compared with the calculated results, which validates the correctness of the coupled field computing method adopted in this paper.