车用液冷机壳电机定子绕组热性能直接设计法

电动汽车驱动电机极力追求高密度轻量小型化,不断推进电机的冷却散热与热传导技术的进步与发展。为此,开展车用驱动电机的电-磁-热一体化设计方法研究,通过构建一种工程化定子热路模型提出了定子绕组热性能直接设计法及其关键热参数,并直接融入电磁设计中,强化热性能设计的同时也弥补了传统电磁设计热负荷AJ值评估热性能的缺陷。通过快速评估电机的热传导能力和绕组温升,可评估比较不同设计方案的热性能,得到电-磁-热一体化设计的最佳解决方案,从而提升电机持续运行的输出转矩。采用定子绕组热性能直接设计法,改进设计了一台液冷机壳车用永磁同步驱动电机样机,显著降低了定子绕组温升。样机温升试验验证了定子绕组热性能直接设计法及其关键热参数评估热性能的有效性。

Direct Approach to Thermal Performance Design of Electrical MachineStator Winding with LiquidCoolingHousing

Electric vehicle traction motor is in the pursuit of high density, small and light weight, which constantly promotes the cooling and heat transfer technology and the development of the motor. So electromagneticthermal codesign method of traction motor was researched. By constructing an engineering stator thermal circuit model, the direct design method of stator winding thermal performance and key thermal parameters were proposed and directly applied to the electromagnetic design, which strengthened thermal performance design as well as made up for the defect of assessing the thermal performance by thermal load value in the traditional electromagnetic design. Thermal performance of different designs could also be compared through the rapid assessment of motor heat transfer ability and winding temperature rise, thus, get the best solution of electromagneticthermal codesign and enhance output torque during the motor continuous operation. A permanent magnet synchronous motor with liquidcoolinghousing was optimized by the direct design method of stator winding thermal performance, which could significantly reduce the stator winding temperature rise. At last, the temperature rise experiment verified the effectiveness of the direct design method of stator winding thermal performance as well as the evaluation of the thermal performance by the key thermal parameters.