Determining the maximum operating temperature of permanent magnets via in-situ measurement of the magnetic flux

被引：4

作者：

Gao, Weibo ^{[1
]}

Kang, Xuyang ^{[2
]}

Zhang, Junliang ^{[2
]}

Chi, Zhenhua ^{[3
]}

机构：

[1] Ningbo Inst Measurement & Testing, Ningbo Inspect & Testing Ctr New Mat, Ningbo 315048, Peoples R China

[2] Ningbo Univ, Fac Elect Engn & Comp Sci, Ningbo 315211, Peoples R China

[3] Ningbo Univ, Sch Phys Sci & Technol, Inst High Pressure Phys, Ningbo 315211, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2022年 / 562卷

基金：

中国国家自然科学基金;

关键词：

Temperature stability; Maximum operating temperature (T-o(m)); B(H) curve; Irreversible flux loss; In-situ measurement; Magnetic flux; STABILITY;

D O I：

10.1016/j.jmmm.2022.169744

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature stability of a magnet is crucial for applications. Traditionally, the designers determine the maximum operating temperature (T-o(m)) of a permanent magnet by either the linearity of the B(H) curve or the irreversible flux loss. However, the reliability and efficiency of the traditional methods are challenging. Here, a new method of "in-situ measurement of the magnetic flux at elevated temperature" is introduced. By studying the temperature-dependence of magnetic flux for the Nd-Fe-B magnet, we find that the magnetic flux declines linearly as the temperature increases. Upon approaching a specific temperature, there occurs a rapid and nonlinear decline of magnetic flux.This temperature can be defined as T-o(m). Furthermore, the magnetic flux dependence on time at elevated temperature is also investigated, wherein the logarithmic relaxation is observed. The decay rate of magnetic flux could be related to the exposure temperature. If the decay rate of maximum magnetic flux loss is acceptable below a given temperature, we can also define the temperature as T-o(m).

引用

页数：5