【摘要】 提出一种适用于永磁无刷直流电动机的场路耦合运动时步有限元分析方法,解决了电机在非正弦供电时的场路耦合分析问题。电路中考虑了开关元件换流重叠过程和绕组中点的电位波动。给出了控制电路与电磁场方程耦合的时步有限元单元分析方法,采用改进的有限元运动边界处理方法——插值运动边界法解决转子运动问题。应用上述模型对1台无刷直流电动机的进行分析,计算结果和样机的实测波形吻合。该方法也适用于其他非正弦供电电机的场路耦合有限元分析。更多还原

【Abstract】 A time stepping finite element analysis(FEA) model coupled circuit field and movement used in analyzing permanent magnet brushless DC(BLDC) motors is presented in this paper,which can solve the problem of non-sinusoidal power supply in field-circuit coupled FEA. The converting process of switching element operation and electric position fluctuation of the circuit winding neutral point are taken into account in circuit equation. The element analysis about the coupling problem of control circuit and field is researched. An improved moving finite element method,interpolation moving boundary method,is adopted to solve rotation problem. The performance of a BLDC motor is analyzed using above model. The calculation result is very close to the measure results. This method can be used in analyzing other non-sinusoidal power supply machines.更多还原