Halbach阵列同心式磁力齿轮参数分析与优化设计

Parameters analysis and optimization design for concentric magnetic gear with halbach permanent-magnet arrays

直驱式同心式磁力齿轮在低速大转矩领域有广泛的应用前景。为获得较正弦分布气隙磁场,所用永磁体采用Halbach阵列充磁,用二维全局解析法计算同心式磁力齿轮磁场分布;分析了调磁环铁心宽度、调磁环高度及外转子轭部厚度等参数与磁力齿轮最大静态转矩之间的关系。磁场全局解析法计算结果与有限元分析结果一致性较好,验证了解析模型的正确性;根据参数分析结果,制作了一台内转子4对极、外转子17对极的Halbach阵列同心式磁力齿轮样机,样机试验结果表明,合理选择结构参数可以提高磁力齿轮的转矩密度,对磁力齿轮的设计提供一种有益参考。

Concentric magnetic gears hold a promising future in low speed high torque field. In order to obtain a sinusoidal distribution of air gap magnetic field,exact 2-D analytical method was proposed to calculate the magnetic field distribution in a concentric magnetic gear with Halbach permanent-magnet arrays,and the relationship between the parameters and maximum static torque was analyzed. The parameters include width of modulating ring core,height of modulating ring and thickness of outer rotor yoke.Compared air-gap magnetic field distributions computed by the analytical method with those obtained from the 2-dimensional finite element method（ FEM）,the waveform shows good agreement with the measured waveform,which proves the proposed method is correct and effective. According to the results of parameters analysis,the concentric magnetic gear prototype was produced,which the numbers of pole pairs on the inner and outer rotors are 4 and 17,respectively. The test results show reasonable structural parameters improve the torque density of magnetic gears,and the design of magnetic gear provides a useful reference.