计及结构特征的TEFC感应电动机温度敏感性研究

Temperature Sensitivity Investigation of Considering the Structural Characteristics of TEFC Induction Motor

为研究小型感应电动机温升分布与其结构特性的数值关系,以一台TEFC(Total enclosed fan-cooled)感应电动机为研究对象,根据流体力学和传热学基本理论,并结合感应电动机定子绕组散下线等结构特点,建立包含离心式风扇及接线盒等结构部件的三维流动与传热耦合数学模型及物理模型,采用有限体积元法,对其三维流体场及温度场进行耦合计算,在利用试验数据佐证本研究精准性的基础上,详细地阐明电动机内部温升随结构特性的敏感性,结果表明,机壳底脚上的横向拉筋对电动机内部的温升分布有着较大的影响,导致与其位置对应的定子绕组存在温升二次升高的现象,同时,转子上具有自力性的风扇对定子绕组端部表现出良好的散热效果,以上结论为中小型电动机的机械结构优化提供了一定参考。

To study the numerical relationship between temperature distribution and structural characteristics of the small induction motor, taking a set of total enclosed fan-cooled（TEFC） induction motor as the research object, on the basis of fluid mechanics and heat transfer theories, considering the structural characteristics that the induction motor stator winding is offline, a flow and heat transfer coupled mathematical and physical 3D model is built and the model contains the centrifugal fan and junction box structure, etc. Using the finite volume element method, the three-dimensional fluid field and temperature field coupling calculation.Based on the precise experimental data, the sensitivity of the temperature rise affected by the internal structure of the motor is illustrated in detail. The results show that the transverse brace on the temperature distribution of the motor has a great influence and lead to its position corresponding to the winding exist secondary temperature rising process. At the same time, the fan with the self-reliance in rotor has good heat dissipation effect for stator end windings, The above results for the mechanical structural optimization of small and medium-sized motor provides a certain practical reference.