变磁阻可控磁通永磁游标电机电磁性能分析

Electromagnetic Performance Analysis of Reluctance-Variable Flux-Controllable Permanent Magnet Vernier Machines

为了兼顾永磁电机低速、大转矩特性和恒功率区的运行范围,提出一种变磁阻可控磁通永磁游标(RVFCPMV)电机。以1台三相22/2对极RVFCPMV电机为例,介绍了RVFCPMV电机的拓扑结构。基于气隙磁通密度的调制,揭示了该电机具有低速、大转矩特性的实质,突破在电枢绕组中通入直轴去磁电流分量的传统弱磁方式,提出一种利用铁磁材料非线性导磁特性,通过调节励磁电流进而改变磁路磁阻方式实现永磁电机弱磁升速的方法。通过有限元方法对RVFCPMV电机进行了计算和分析,验证了该电机基速以下的低速、大转矩输出特性和基速以上的弱磁调速能力。

In order to take both of the low-speed and high-torque characteristics of permanent magnet machines and the operating range of constant power range into account, a flux-controllable permanent magnet vernier（RVFCPMV） machine was proposed. Taking a three-phase RVFCPMV machine with 22/2-pole as an example,the RVFCPMV machine topology was introduced firstly. The equivalent magnetic circuit method was used to reveal the characteristics of low-speed and high-torque. Different with the traditional flux weakening method by injecting d-axis demagnetization current component into armature windings,a new flux weakening control method was proposed,of which the key was to change the magnetic circuit reluctance based on the nonlinear performance of ferromagnetic materials by adjusting the excitation current. The electromagnetic performances of RVFCPMV machine were calculated and analyzed using finite element analysis,which verified the characteristics of low-speed and high-torque output and the capacity of flux weakening control.