工艺·技术·应用
2:17型稀土钴永磁体磁饱和度对其不可逆损失的影响 罗伯斯庇尔烷基铝沈安国
（西南应用磁学研究所，四川绵阳621000）电力系统运行与控制
摘 要：采用亥姆霍兹线圈测试不同磁饱和度及工作点（P c）的2:17型钐钴磁体温度老化前后的磁通，计算经温度老化后的不可逆损失，探讨了老化温度、永磁体磁饱和度及P c对其不可逆损失的影响。结果表明，永磁体的不可逆损失随老化温度的升高、磁体磁饱和度的降低及P c的降低而变大。不可逆损失绝对值小于1%时，老化温度为200℃，P c =0.27的磁体磁饱和度需要超过53.6%，而P c =1.78仅需超过31.5%，老化温度为300℃，P c =0.27的磁体的磁饱和度需要超过88.6%，而P c =1.78的磁体仅需超过68.1%。 播种希望的种子
关键词：稀土钴永磁体；磁饱和度；老化；不可逆损失
电视频道包装中图分类号：TM273 文献标识码：A 文章编号：1001-3830(2017)03-0043-02 Influence of degree of magnetization saturation on the irreversible loss of 2:17-type rare earth cobalt permanent magnets
SHEN An-guo
Southwest Institute of Applied Magnetics, Mianyang 621000, China
Abstract: In this paper, the magnetic flux of 2:17-type Sm-Co magnets was tested in different degree of magnetic saturation and working point (P c) by Helmholtz coil meter before and after aging, and their irreversible loss after temperature aging calculated. The influence of aging temperature, degree of magnetic saturation and working point on the irreversible loss was discussed. The results show that the irreversible loss of the magnet increases with increasing aging temperature, decreasing degree of magnetic saturation and working point. For the irreversible loss absolute value of less than 1% and the aging temperature of 200℃, the magnetic saturation of magnet of P c =0.27 require to be over 53.6%, while that of P c =1.78 only require to exceed 31.5%; for the irreversible loss absolute value of less than 1% and the aging temperature of 300℃, the magnetic saturation of magnet with P c =0.27 require to be over 88.6%, while that of P c =1.78 only require to exceed 68.1%.
Key words: 2:17-type rare earth-cobalt permanent magnet; degree of saturation magnetization; aging；
irreversible loss
建筑结构抗震论文1 引言
2:17型稀土钴永磁材料以其优异的磁性能和优良的温度稳定性以及较强的耐腐蚀性而广泛应用于电机、电真空器件、磁力耦合器件、传感器等领域。永磁体在使用前必须使用外加磁场对其进行磁化，使其本征的永磁磁特性得以显现，永磁体达到技术磁化饱和状态对应的外加磁场称之为饱和磁化场。一般认为，2:17型稀土钴永磁材料的饱和 收稿日期：2016-07-15修回日期：2017-01-23
通讯作者：沈安国 E-mail：sag918@163 磁化场是材料内禀矫顽力H cj的3~5倍[1]，据此，饱和磁化稀土钴永磁体需要很高的磁化场。对于辐向或多极充磁磁体、由于工艺限制而要求装配后磁化及超大尺寸磁体等，磁化场往往不能达到这一要求，即磁体不能被磁化饱和。为实现磁体的饱和磁化，通常的方法是降低材料的内稟矫顽力H cj，但是，低内禀矫顽力的永磁材料加大了高温长时间磁性能的减退风险[2]，并限制了磁体的工作温度。本文探讨了2:17型稀土钴永磁体磁饱和度对其不可逆损失的影响，以期为其磁化场设计提供参考。
磁性材料及器件2017年5月43
