纯电动汽车驱动电机定子温度场仿真与散热优化

发布时间：2018-05-02 00:51

本文选题：电机 + 温度场　；参考：《合肥工业大学》2014年硕士论文

【摘要】：作为纯电动汽车的关键零部件，车用永磁同步电机具有体积小、功率密度高等特点，其发热和散热问题是电机设计过程中的关键问题之一。本文以一台永磁同步驱动电机为研究对象，以提高电机散热效率为目的，借助FLUENT分析软件，对电机进行了定子温度场仿真和散热优化。本文按照“发热功率计算—热仿真—散热优化—仿真验证”的思路对电机进行散热优化研究。首先采用公式法和样机实验数据结合的方法求出了样机主要发热部件的发热功率，然后对绕组、铁芯等复杂部件进行了等效和简化，建立了定子热仿真的有限元模型，仿真计算得到了电机定子在额定工况下的稳态和瞬态温度分布。经过与温升实验数据的对比，，验证了仿真结果的准确性和有效性。采用仿真方法对三种不同的散热水道结构、不同的冷却水流量进行了研究，得出平行水道和较高的流量有利于散热。为了进一步对平行水道的结构进行优化，建立了水道的热阻数学模型，通过求解目标函数最小值得到了最优的水道高度和宽度。提出了一种增大电机水道散热面积的方法，即在水道中设置三排散热肋片，该方法将水道内散热面积提高了40.16%。最后对上述优化结果进行了总结，得到了最终优化方案，仿真结果显示优化后电机温升降低了9.6%，优化方案的有效性得到了验证。
[Abstract]:As the key parts of pure electric vehicle, the permanent magnet synchronous motor (PMSM) used in vehicle has the characteristics of small size and high power density. The heating and heat dissipation is one of the key problems in the motor design process. In this paper, a permanent magnet synchronous drive motor (PMSM) is studied. In order to improve the efficiency of motor heat dissipation, the stator temperature field simulation and heat dissipation optimization are carried out with the help of FLUENT software. According to the idea of "heat power calculation-thermal simulation-heat dissipation optimization-simulation verification", this paper studies the heat dissipation optimization of motor. Firstly, the heating power of the main heating parts of the prototype is obtained by combining the formula method with the experimental data of the prototype, then the winding, iron core and other complex components are equivalent and simplified, and the finite element model of the stator thermal simulation is established. The steady and transient temperature distributions of the motor stator under rated working conditions are obtained by simulation. The accuracy and validity of the simulation results are verified by comparing with the experimental data of temperature rise. Three different cooling channel structures and different cooling water flow are studied by using simulation method. It is concluded that parallel waterways and high flow rate are beneficial to heat dissipation. In order to further optimize the structure of parallel waterways, a mathematical model of channel thermal resistance is established, and the optimal height and width of the channel are obtained by solving the minimum value of the objective function. In this paper, a method of increasing the radiating area of the motor waterway is presented, that is, three rows of radiating fins are arranged in the watercourse, and the heat dissipation area of the watercourse is increased by 40.16%. Finally, the optimization results are summarized and the final optimization scheme is obtained. The simulation results show that the temperature rise of the motor decreases by 9.6. the effectiveness of the optimization scheme is verified.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U469.72;TM303.3

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