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

该研究项目的目的是建立制造高性能磁铁的模拟方案。磁性性能越高，电动机本身越小。但是，没有科学方法来预测或确定高磁性性能的最佳过程。混凝土目标如下：1）建立一个磁磁通连续理论和基于该理论的方案，用于在磁性命中的NDFEB磁粉压实过程中模拟磁对齐的方案2）进行基于恐慌建模的模拟模型，以开发一种描述NDFEB粉末特征的模型；因此，与实验结果相比，磁场中的压实结果。3）研究和研究磁场中磁比对与压实条件之间的关系。所获得的结果如下：1）基于开发的磁粘合式Theoy中确定的参数，我们开发了一个模拟方案，其中更多的t融合了一个模型，用于描述由磁性颗粒引起的磁场。然后，我们模拟了磁场中NDFEB粉末的压实，发现在施加的磁场下，由于磁性颗粒而引起的磁场的效果没有影响，而当去除施加的磁场时，这对粉末行为产生了很大的影响。还观察到，在紧凑型上部的相对密度达到0.4的相对密度较高，底部的密度较高。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，随着压实的进行，磁比对最好的磁比对变得更糟； 3）3）在应用磁场中压实过程中磁粉的行为的原位观察表明，颗粒的位移是连续的，并且所施加的磁场在压实的粉末底部更明显地取代了粉末。4）压实在压实的底部附近。4）在压实的相对密度下，在磁场上，磁性在磁场上的相对密度更高，在磁性领域中，磁性在磁性领域中，磁性在磁性领域中，在磁性领域中，磁性在磁性领域中，在磁性领域中，在磁性领域中，磁性在磁性领域中，在磁性领域中，在磁性范围内，磁性在磁场上均高于磁性。没有实现目标之一。应该为将来的工作做到这一点，以使实际的应用变得可能成为可能。较少的