全封闭永磁电机流体场和温度场的计算分析

Computational Analysis of Fluid Field and Temperature Field of the Totally Enclosed Permanent Magnet Motors

为提高全封闭永磁电机的功率密度,以一台全封闭空冷190 kW永磁电机为例,基于计算流体力学和传热学理论,建立电机的三维全域流体与固体耦合的数学模型,给出了电机各个部件的导热系数。采用有限体积法对流体场与温度场进行耦合计算,得到了电机的散热系数及整体的温度分布。此外,分析了不同结构参数对电机内部流线速度的影响,不同定子通风口数量和尺寸对电机温度分布的影响。研究结果表明,有效的通风孔数量和尺寸能够有效降低电机的温度,为全封闭永磁电机的通风系统设计提供了理论依据。

In order to increase the power density of the totally enclosed permanent magnet motor,a totally enclosed air-cooled 190 kW permanent magnet motor is taken as an example,the three-dimensional full-domain fluid-solid coupling mathematical model of the motor is established based on the theory of computational fluid dynamics and heat transfer,and then,the thermal conductivity coefficients of the various components of the motor are gained.The finite-volume method is applied to perform the coupling calculation of the fluid field and the temperature field,thus,the thermal coefficients of the motor and the temperature distribution of the motor as a whole are obtained either.In addition,influence on the internal flow velocity of the motor by different structural parameters as well as influence on the temperature distribution of the motor by different numbers and sizes of stator vents is analyzed.The results show that the effective number and size of vents is able to effectively reduce the temperature of the motor,providing a theoretical basis in the design of the ventilation system of the totally enclosed permanent magnet motor.