Development of Nd-Fe-B Magnet Generator for Small Hydraulic Power Station

建立了一种分析永磁发电机磁特性的方法。研究了永磁体的最佳磁体结构、磁化方式和磁化强度。并通过实验对数值分析进行了验证。主要研究成果如下：1.仿真方法的发展对有限元方法进行了改进，使其能够对永磁发电机的性能特性进行分析。此外，还建立了一种分析电容-放电脉冲充磁器磁场的新方法。磁体的优化配置研究表明，为了提高磁通密度，应将永磁体设置在径向或倾斜方向。永磁体组装后的磁化强度。单极磁化效果较好。磁体的退磁为防止短路时电枢反应引起的退磁，给出了最佳的磁体结构。实验制作了一个模型发生器，并将测量的通量密度与计算结果进行了比较。

A method for analyzing magnetic characteristics of permanent magnet generator is established. The optimal configuration of magnets, magnetization methods Nd-Fe-B permanent magnets are investigated. The verification of numerical analysis is also carried out by experiments. The results obtained can be summarized as follows:1. Development of Simulation Method The finite element method is improved so that the performance characteristics of permanent magnet generator can be analyzed. Moreover, a new method for analyzing the magnetic field in a capacitor-discharge impulse magnetizer is established.2. Optimal Configurations of Magnets It is shown that the permanent magnet should be set in the radial or inclined direction in order to increase the flux density. The magnetization of permanent magnet after assembling. and one-pole magnetization are preferable.3. Demagnetization of Magnet The optimal configuration of magnet to prevent the demagnetization due to the armature reaction under short-circuit is shown.4. Experiments A model generator is manufactured, and the measured flux densities are compared with calculated results.