绕线转子无刷双馈电机齿驻波特性研究

Research on Tooth Standing Wave Characteristic of Wound Rotor Brushless Doubly-Fed Machine

由于无刷双馈电机定子包含两套绕组,电机转子需要与两套绕组进行耦合,所以其气隙合成磁场由两个极对数不同的基波磁场构成,导致其磁场特性相较于一般的交流电机更为复杂。该文以绕线转子无刷双馈电机为研究对象,将分析坐标系转换到转子坐标系分析气隙磁场,通过理论推导和有限元仿真提出该合成磁场具有与驻波类似的齿驻波特性,该特性表明合成磁场轴线相对转子静止,具有与同步电机相似的运行特性。同时,该特性对于无刷双馈电机的极数配合选择与性能优化具有指导意义。最后,通过在转子绕组中嵌入探测线圈并测量其感应电动势的方法进行了样机实验,结果证明了理论分析的正确性。

Since there are two sets of winding in the stator of brushless doubly-fed machine(BDFM)and the rotor needs to couple with both two sets of stator winding,the air-gap resultant magnetic field of BDFM is composed of two fundamental harmonic field with different pole pair numbers,which leads to a more complicated magnetic characteristic compared with normal AC machines.Taking wound rotor BDFM as the researching subject,the air-gap magnetic field is analyzed from rotor reference frame by theoretical derivation and finite element(FE)simulation in the paper.A characteristic similar to standing wave,which is called tooth standing wave,is proposed for the air-gap magnetic field.It indicates that the axis of resultant magnetic field is relatively static to rotor in wound rotor BDFM,which is similar with the operating feature of synchronous machine.Meanwhile,the tooth standing wave has great significance in selection of pole pair numbers and optimization of machine performance.At last,a prototype machine has been experimented by embedding detective coils in rotor winding to measure the air-gap flux density,which shows the validity of the theoretical analysis.