基于多场量的笼型感应电机三维瞬态磁热固耦合计算分析

发布时间：2019-01-01 19:00

【摘要】：以一台小型感应电机为例,参考样机转子斜槽结构,利用有限元法,对电机进行了三维瞬态磁-热-固单相耦合计算。首先计算了电机在额定负载情况下的三维电磁场,计算中考虑了端部绕组对电机的影响。以三维电磁场节点的损耗密度结果为载荷,耦合到三维温度场模型中作为热源,施加边界条件,模拟了电机在额定负载情况下的瞬态温度变化过程,得到了不同时刻电机温度分布及各点温度随时间变化曲线。对比不同时刻温度分布,总结出电机内部传热规律,通过温升实验验证了仿真计算结果的准确性。最后,以转子的瞬态温度场结果为载荷,施加相应约束条件,计算并得到了转子鼠笼热应力分布情况,找到了鼠笼易断裂的位置并分析受力的原因。该文采用的计算方法可为电机多物理场耦合计算,及研究该类电机断条故障原因及导条断裂过程分析提供参考。
[Abstract]:Taking a small induction motor as an example, with reference to the rotor slant structure of the prototype, the three-dimensional transient magnetic-thermal-solid single-phase coupling calculation of the motor is carried out by using finite element method (FEM). Firstly, the three dimensional electromagnetic field of the motor under rated load is calculated, and the effect of the end windings on the motor is considered. Taking the result of loss density of 3D electromagnetic field node as load, coupled to 3D temperature field model as heat source and applying boundary conditions, the transient temperature change process of motor under rated load is simulated. The temperature distribution of the motor at different times and the temperature variation curves of each point with time are obtained. By comparing the temperature distribution at different times, the internal heat transfer law of the motor is summarized, and the accuracy of the simulation results is verified by the temperature rise experiment. Finally, taking the transient temperature field of the rotor as the load and applying the corresponding constraint conditions, the thermal stress distribution of the rotor cage is calculated and obtained, and the position where the cage is prone to fracture is found and the cause of the force is analyzed. The calculation method used in this paper can be used as a reference for the multi-physical field coupling calculation of the motor and the analysis of the fault cause of the broken bar and the fracture process of the guide bar for this kind of motor.
【作者单位】：哈尔滨理工大学电气与电子工程学院;
【基金】：国家自然科学基金项目(51107022) 黑龙江省杰出青年科学基金(JC2016010) 哈尔滨市科技创新人才研究专项资金(青年后备人才)项目(RC2014QN007005)~~
【分类号】：TM346

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