双边永磁励磁游标电机运行原理及电磁特性仿真研究

为了进一步提高电机的功率密度和转矩密度,以满足直驱系统低速、大转矩的运行工况,提出一种新型双边永磁励磁游标(DPMEV)电机。该电机定子和转子上均放置有永磁体,利用定、转子齿对气隙磁导的双向调制作用,将两组永磁体产生的永磁磁场调制成少极数、高转速的有效谐波磁场,并根据有效谐波磁场设计电枢绕组,从而使定、转子上两组永磁体同时与电枢绕组耦合。介绍了DPMEV电机的拓扑结构。基于等效磁路法,对该电机的气隙磁通密度进行了分析,表明该电机可利用气隙磁导的双向调制作用,实现电机功率密度和转矩密度的有效提高。在深入分析电机工作原理的基础上,通过有限元法对DPMEV电机进行了计算和分析,验证了该电机具有适用于直驱系统的高功率密度和高转矩密度特性。

Simulation Study on the Operation Principle and ElectromagneticPerformance of DualPermanentMagnet Excited Vernier Machine

A new dualpermanentmagnet excited vernier (DPMEV) machine was proposed, in which the power density and torque density were further improved to meet the low speed and high torque operating conditions of direct drive systems. Two sets of permanent magnets (PMs) were placed on stator and rotor, respectively, and the PM magnetic field could be modulated to effective harmonic magnetic field components with low polepair number and high speed by the dualmodulation effect of stator and rotor teeth. Then the armature winding was designed according to the effective harmonic magnetic fields to achieve the coupling between the magnetic fields excited by two sets of PMs and armature windings. The topology of DPMEV machine was introduced. The air gap flux density was analyzed based on the equivalent magnetic circuit method, which proved the improvement potentiality of power density and torque density based on the dualmodulation effect. The performances of DPMEV machine were calculated and analyzed by the finite element method, verifying the advantages of high power density and high torque density which were suitable for the direct drive system.