Liu Guangdou, Hou Shiqin, Xu Xingping, Xiao Wensheng
College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China.
Sensors (Basel). 2021 Apr 4;21(7):2522. doi: 10.3390/s21072522.
In the linear and planar motors, the 1D Halbach magnet array is extensively used. The sinusoidal property of the magnetic field deteriorates by analyzing the magnetic field at a small air gap. Therefore, a new 1D Halbach magnet array is proposed, in which the permanent magnet with a curved surface is applied. Based on the superposition of principle and Fourier series, the magnetic flux density distribution is derived. The optimized curved surface is obtained and fitted by a polynomial. The sinusoidal magnetic field is verified by comparing it with the magnetic flux density of the finite element model. Through the analysis of different dimensions of the permanent magnet array, the optimization result has good applicability. The force ripple can be significantly reduced by the new magnet array. The effect on the mass and air gap is investigated compared with a conventional magnet array with rectangular permanent magnets. In conclusion, the new magnet array design has the scalability to be extended to various sizes of motor and is especially suitable for small air gap applications.
在直线电机和平面电机中，一维哈尔巴赫磁体阵列得到了广泛应用。通过分析小气隙处的磁场发现，磁场的正弦特性会变差。因此，提出了一种新型的一维哈尔巴赫磁体阵列，其中应用了具有曲面的永磁体。基于叠加原理和傅里叶级数，推导了磁通密度分布。得到了优化的曲面并用多项式进行拟合。通过与有限元模型的磁通密度进行比较，验证了正弦磁场。通过对永磁体阵列不同尺寸的分析，优化结果具有良好的适用性。新型磁体阵列可显著降低力脉动。与具有矩形永磁体的传统磁体阵列相比，研究了其对质量和气隙的影响。总之，新型磁体阵列设计具有可扩展性，可扩展到各种尺寸的电机，尤其适用于小气隙应用。
