考虑漏磁的永磁电机磁路建模方法及特性分析

Magnetic circuit modeling method and electromagnetic characteristics analysis of permanent magnet synchronous motor considering flux leakage

在建立了永磁同步电机2D有限元仿真模型的基础上,采用等效磁路法对4极24槽永磁同步电机的各项特性进行分析.根据表贴式永磁同步电机在空载和负载状态下的磁力线分布情况,分别建立空载状态下的简化等效磁路模型和负载状态下的交直轴等效磁路模型,分析电机磁场分布、电机绕组磁链、电枢反电动势、对于等效磁路模型同时采用节点磁位法来求解分析,在考虑漏磁影响的情况下,对比有限元模型计算结果和简化等效磁路模型的分析,验证该等效磁路模型的可行性.分析永磁体极弧系数对永磁同步电机特有的齿槽转矩特性进行参数化计算,得出极弧系数为0.85时,齿槽转矩最小。

Based on the establishment of the 2 D finite element simulation model of permanent magnet synchronous motor(PMSM),the equivalent magnetic circuit method was used to analyze the characteristics of the 4-pole 24 slot PMSM.According to the distribution of magnetic force lines of the table-type permanent magnet synchronous motor(PMSM)under no-load and load conditions,the simplified equivalent magnetic circuit model under no-load and the equivalent magnetic circuit model of the AC and DC axis under load conditions are established respectively to analyze the distribution of the motor′s magnetic field,the winding flux link of the motor and the armature back electromotive force.For the equivalent magnetic circuit model,the node magnetic potential method is used to solve and analyze the model.Under the condition of considering the influence of magnetic leakage,the calculation results of the finite element model are compared with the analysis of the simplified equivalent magnetic circuit model to verify the feasibility of the equivalent magnetic circuit model.By analyzing the pole-arc coefficient of the permanent magnet,the parameter calculation is carried out to calculate the special cog torque of the permanent magnet synchronous motor,and the conclusion is that the cog torque is the minimum when the pole-arc coefficient is 0.85.