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Establishment of Simulation Methodology for Fabrication of High Performance Magnet

高性能磁体制造仿真方法的建立

基本信息

批准号：
11555184
负责人：
SHIMA Susumu
金额：
$ 8.7万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The objective of this research project is to establish a simulation scheme for fabrication of high performance magnets ; the higher the magnetic performance, the smaller the motor itself. However, there has been no scientific methodology for predicting or determining the optimum process for high magnetic performance. The concrete objectives are as follows :1) Establish a magneto-Cosserat continuum theory and a scheme based on this theory for simulating magnetic alignment during compaction of NdFeB magnetic powder in magnetic filed2) Carry out simulation based on paniculate modeling by developing a model that describes characteristics of NdFeB powder; thus compare with results of experiment on compaction in magnetic field.3) Investigate and study the relationship between magnetic alignment and conditions of compaction in magnetic field. The obtained results are as follows :1) Based on the determined parameters in the developed magneto-Cosserat theoy, we developed a simulation scheme tha … More t incorporated a model for describing the magnetic field that is induced by the magnetized particles. We then simulated compaction of NdFeB powder in magnetic field and found that under the applied magnetic field the effect of the field due to the magnetized particles is not influential, while thisgives quite a large effect on powder behvior when the applied magnetic field is removed. It was also observed that up to a relative density of 0.4 the density was higher at the upper part of the compact and lower at the bottom part; this agreed with experimental results.2) For a case where an initial density variation was given in the simulation, the magnetic alignment, which was best just after application of a magnetic field, became worse as compaction proceeded; this is in good agreement with experimental result.3) In-situ observation of the behavior of magnetic powder during compaction in an applied magnetic field revealed that the displacement of the particles were continuous and that the applied magnetic field displaced the powder more significantly near the bottom part of the powder.4) After compaction up to a relative density of 0.4, the density at the upper part was higher in compaction in magnetic field than in without magnetic field.Development of 3-D simulation scheme, which was one of the objectives, was not realized. This should be done for future work, so that actual application will become possible. Less

本研究的目的是建立一个高性能磁体制造的模拟方案;磁性能越高，电机本身就越小。然而，目前还没有科学的方法来预测或确定高磁性能的最佳工艺。具体目标如下：1）建立磁-Cosserat连续介质理论和基于该理论的NdFeB磁粉磁场压制过程磁取向模拟方案; 2）通过建立描述NdFeB磁粉特性的模型，进行基于粒子模型的模拟，并与磁场压制实验结果进行比较; 3）研究磁取向与磁场压制条件的关系。1）在已确定的磁-Cosserat理论参数的基础上，提出了一种模拟方案， ...更多信息它结合了一个模型，用于描述由磁化粒子引起的磁场。然后对NdFeB粉末在磁场中的压制进行了模拟，发现在外加磁场作用下，磁化颗粒产生的磁场对粉末的压制效果没有影响，而当外加磁场消失时，磁化颗粒产生的磁场对粉末的压制效果有很大的影响。还观察到，当相对密度达到0.4时，压坯上部的密度较高，而底部的密度较低，这与实验结果一致。2）对于在模拟中给出初始密度变化的情况，在施加磁场后刚达到最佳的磁取向，随着压实的进行而变得更差; 3）对磁粉在外加磁场中压制过程中的行为进行了原位观察，发现磁粉的位移是连续的，且在磁粉底部附近，外加磁场对磁粉的位移更明显在相对密度为0.4的情况下，有磁场时上部的密度比无磁场时高，但作为目标之一的三维模拟方案的开发没有实现。今后的工作应该这样做，以便实际应用成为可能。少