Zhang Xiangyong, Liu Haipeng, He Yunli, Peng Tingrui, Su Bin, Guan Huiyuan
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
Micromachines (Basel). 2021 Dec 11;12(12):1541. doi: 10.3390/mi12121541.
Due to the particular arrangement of permanent magnets, a Halbach array has an significant effect of magnetism and magnetic self-shielding. It can stretch the magnetic lines on one side of the magnetic field to obtain an ideal sinusoidal unilateral magnetic field. It has a wide application range in the field of energy harvesting. In practical applications, magnetic induction intensity of each point in magnetic field is not only related to the induced current and conductor but also related to the permeability of the medium (also known as a magnetic medium) in the magnetic field. Permeability is the physical quantity that represents the magnetism of the magnetic medium, which indicates the resistance of magnetic flux or the ability of magnetic lines to be connected in the magnetic field after coil flows through current in space or in the core space. When the permeability is much greater than one, it is a ferromagnetic material. Adding a ferromagnetic material in a magnetic field can increase the magnetic induction intensity B. Iron sheet is a good magnetic material, and it is easy to magnetize to generate an additional magnetic field to strengthen the original magnetic field, and it is easy to obtain at low cost. In this paper, in order to explore the influence of ferromagnetic material on the magnetic field and energy harvesting efficiency of the Halbach array energy harvesting structure, iron sheets are installed on the periphery of the Halbach array rotor. Iron sheet has excellent magnetic permeability. Through simulation, angle between iron sheet and Halbach array, radian size of iron sheet itself and distance between iron sheet and Halbach array can all have different effects on the magnetic field of the Halbach array. It shows that adding iron sheets as a magnetic medium could indeed change the magnetic field distribution of the Halbach array and increase energy harvesting efficiency. In this paper, a Halbach array can be used to provide electrical power for passive wireless low-power devices.
由于永磁体的特殊排列，哈尔巴赫阵列具有显著的磁效应和磁自屏蔽效果。它可以拉伸磁场一侧的磁力线，以获得理想的正弦单边磁场。它在能量收集领域有着广泛的应用范围。在实际应用中，磁场中各点的磁感应强度不仅与感应电流和导体有关，还与磁场中介质（也称为磁介质）的磁导率有关。磁导率是表示磁介质磁性的物理量，它表示磁通量的阻力或线圈在空间或铁芯空间中流过电流后磁场中磁力线的连通能力。当磁导率远大于1时，它是一种铁磁材料。在磁场中添加铁磁材料可以增加磁感应强度B。铁片是一种良好的磁性材料，它很容易被磁化以产生一个附加磁场来增强原始磁场，并且很容易以低成本获得。在本文中，为了探究铁磁材料对哈尔巴赫阵列能量收集结构的磁场和能量收集效率的影响，在哈尔巴赫阵列转子的周边安装了铁片。铁片具有优异的磁导率。通过模拟可知，铁片与哈尔巴赫阵列之间的夹角、铁片本身的弧度大小以及铁片与哈尔巴赫阵列之间的距离都会对哈尔巴赫阵列的磁场产生不同的影响。结果表明，添加铁片作为磁介质确实可以改变哈尔巴赫阵列的磁场分布并提高能量收集效率。在本文中，哈尔巴赫阵列可用于为无源无线低功率设备提供电力。
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