径向-轴向复合气隙外转子永磁电动机的新型磁路研究

Research on a New Magnetic Circuit of the Radial Axial Composite Air Gap External Rotor Permanent Magnet Motor

基于永磁材料本身磁导率低的特点,通过变换铁心结构获得低磁阻磁路,达到提高外转子永磁电动机功率密度的目标。运用Magnet软件对现有表贴式永磁电动机磁路进行静磁场分析,验证了相邻永磁体互为对方磁路中的大磁阻及漏磁大的缺陷。通过比较永磁材料、铁心材料和空气的磁导率特性,创新设计了一款径向-轴向复合气隙磁路的外转子永磁电动机。用Magnet软件对创新结构进行了对比静态磁场仿真,将气隙处的磁通量密度显著提高了20%。该结构如获得应用,则能提高外转子永磁电动机的功率密度,且能实现外转子永磁电动机目标应用对象的轻量化。

Based on the low permeability of permanent magnet materials themselves,the goal of improving the power density of external rotor permanent magnet motors is achieved by transforming the iron core structure to obtain a low reluctance magnetic circuit.Using Magnet software to analyze the static magnetic field of the existing surface mounted permanent magnet motor magnetic circuit,it is found that adjacent permanent magnets have defects such as high magnetic resistance and leakage in each other's magnetic circuit.A radial axial composite air gap magnetic circuit external rotor permanent magnet motor is innovatively designed by comparing the permeability characteristics of permanent magnet materials,iron core materials and air.A comparative static magnetic field simulation is conducted on the innovative structure using Magnet software,which significantly increases the magnetic flux density at the air gap by 20%.If this structure is applied,it will improve the power density of external rotor permanent magnet motors,and achieve the goal of lightweight application of external rotor permanent magnet motors.