基于时步有限元分析的超高效电机定子槽形优化设计

Stator Slot Optimal Design of Premium Motors Based on Time-stepping Finite Element Method

在我国,中小型电机的定子槽形通常为梨形槽,且不同机座号的槽形尺寸已沿用了数十年。为研究有利于降低电机损耗的定子槽形尺寸,建立了基于时步有限元法的损耗计算模型,以一台5.5 kW异步电机为例,分析了槽口宽度、槽口高度、槽肩角、槽宽、槽高及槽半径等6个槽形尺寸对损耗的影响程度。结果表明,槽口宽度、槽宽和槽底半径对损耗影响较大。在槽满率基本不变,且确保电机原有起动性能的前提下,提出了基于时步有限元法的定子槽形优化设计方法,利用该方法对上述5.5 kW电机定子槽进行改进设计。经改进后,电机空载损耗降低了约7%,满载损耗降低了约2%。

In our country, the peariform slot was usually adopted as the stator slot of medium and small asynchronous motor, and its size of different machine base number has been used for several decades. In order to study the stator slot size for loss reduction, taking a 5.5 kW motor as an example, the loss prediction model was established based on time stepping finite element method （T-S FEM）, and the influence of six stator slot size on the losses were analyzed, which were slot opening width, slot opening height, slot tip angle, slot width, slot height, slot radius. It is found that slot opening width, slot width and slot radius have significant effect on total losses. Further, on the premise of basically unchanged slot fill factor and original starting performance, a stator slot optimal design method, which is based on T-S FEM, is presented. With this method, the total loss of 5.5 kW motor under no-load and full-load conditions can be reduced about 7% and 2% respectively.