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Studies on Flux Controlling Method with Convergence and Divergence (Magnetic flux lens)

会聚发散磁通控制方法研究（磁通透镜）

基本信息

批准号：
03650354
负责人：
ENOKIZONO Masato
金额：
$ 1.34万
依托单位：
Oita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

To develop control elements in controlling magnetic flux, this study have been curried out for the use of flux convergence and divergence. The summary of the results is shown below.(1)Alternating magnetic fluxWe showed that it is possible to obtain convex and concave lens effect for alternating flux by using the eddy current effect. When a conductive plate with a central hole and one slit is placed in alternating magnetic field, the flux is concentrated in the hole(convex lens effect). In the case of the plate without slit, we can obtain the concave lens effect. The convex lens effect is very useful in generating a high magnetic field, and the concave lens effect can be applied to magnetic shielding.(2)DC magnetic fluxIn the case of dc magnetic field, it is possible to obtain the same effects above by using the permanent magnet. Combining a electromagnet and plural permanent magnet with high coercive force, the magnetic field can be designed. We have found that the exciting current value can reduce in the electromagnet covered by permanent magnets.(3)Switching of magnetic circuitThere are two kinds of permanent magnet which is used in electrical machinery and apparatus. The one is the alnico type magnets that the coercive force is small and the remanent flux density is large. The other is the ferrite type magnets that the coercive force is large and the residual magnetization is small. We developed a switching system of magnetic circuit by the combination of the different type magnets. Changing the magnetizing direction of the alnico type magnet, the flow of flux line can be controlled easily. This switching system has a wide application in the lifting magnet, the high magnetic field generator, and the electromagnetic brakes.

为了开发控制磁通量的控制元件，本研究已经进行了磁通量的会聚和发散的使用。结果总结如下所示。（1）交变磁通我们证明了利用涡流效应可以获得交变磁通的凸、凹透镜效应。当带有中心孔和一个狭缝的导电板置于交变磁场中时，通量集中在孔中（凸透镜效应）。在平板无狭缝的情况下，我们可以得到凹透镜效应。凸透镜效应在产生高磁场时非常有用，而凹透镜效应可应用于磁屏蔽。(2)DC磁通量在直流磁场的情况下，通过使用永磁体可以获得上述相同的效果。将一个电磁铁和多个高矫顽力永磁铁组合，可以设计磁场。研究发现，在电磁铁表面覆盖永磁体，可以降低电磁铁的励磁电流。（3）磁路的切换在电机和电器中使用的永磁体有两种。一种是铝镍钴型永磁体，矫顽力小，剩磁磁通密度大。另一类是矫顽力大、剩磁小的铁氧体类磁体。通过不同类型磁铁的组合，开发了一种磁路切换系统。通过改变磁钢的磁化方向，可以很容易地控制磁力线的流动。该开关系统在起重电磁铁、强磁场发生器和电磁制动器中有广泛的应用。