模块化定子混合励磁同步电机磁网络建模与分析

Modeling and analysis of magnetic network of modular stator hybrid excitation synchronous motors

以一台模块化定子交替极转子结构的混合励磁同步电机为研究对象,提出了一种三维磁网络模型,综合考虑了定子齿顶局部饱和问题、定子槽漏磁、转子端部漏磁、轴向漏磁、电枢反应、转子转动等因素。利用所搭建的三维磁网络模型分别计算分析了电机的气隙磁通密度、磁链与电动势等特性,并通过有限元分析验证了模型的准确性,同时,还对混合励磁同步电机的性能包括调磁能力、电磁转矩、铁耗等进行了对比分析,得出了该电机调磁能力良好,在通以2 A与4 A励磁电流时,相磁链相较于无励磁时分别增加了22.68%与45.36%,而在通以-2 A与-4 A励磁电流时,相磁链分别降低了13.45%与24.9%;功率调节灵活,在低速工作时可以通过增加电励磁电流来提升电机的输出功率;以及采用非晶合金可以有效降低铁耗,提高效率的结论。该解析模型与有限元方法相比节约了大量时间,为更高效准确地分析混合励磁同步电机的性能提供了新的思路。

A three-dimensional magnetic equivalent circuit(MEC)model was proposed,which is based on a modular stator and alternating pole rotor structure motor.In this model,the local saturation problem of stator tooth top,stator slot magnetic leakage,rotor end magnetic leakage,axial leakage flux,armature reaction,rotor rotation and other factors were comprehensively considered.The three-dimensional mag-netic network model was used to calculate and analyze the characteristics of the air gap magnetic flux den-sity,flux and EMF,etc.At the same time,a comparative analysis was conducted on the performance of the hybrid excitation synchronous motor,including magnetic regulation ability,electromagnetic torque,i-ron loss,etc.It is found that the motor has good magnetic regulation ability.When applying 2 A and 4 A excitation currents,the phase flux is increased by 22.68%and 45.36%respectively compared with when there is no excitation,while when applying-2 A and-4 A excitation currents,the phase flux is decreased by 13.45%and 24.9%respectively;Power regulation is flexible,and the output power of the motor can be improved by increasing the excitation current when working at low speeds;And the conclu-sion using amorphous alloys can effectively reduce iron consumption and improve efficiency.Compared with the finite element method,this analytical model saves a lot of time and provides a new idea for more efficient and accurate analysis of the performance of the new HESM.