强永磁体实验的准静态电磁分析
A quasi-static electromagnetic analysis for experiments with strong permanent magnets
摘要：
本文提出了一种用强永磁盘形磁铁进行实验的电磁分析方法。该分析基于众所周知的实验，该实验通过将强磁体通过垂直放置的金属圆柱体落下并观察磁体如何以恒定速度缓慢地通过圆柱体落下来演示循环涡电流的效果。这个实验是相当壮观的超强钕磁铁和铜或铝制成的厚金属圆柱体。这个实验的严格理论是基于准静态近似的麦克斯韦方程组，一个无限长的圆柱体（无边缘效应）和均匀磁化的圆盘磁铁。结果是有用的教师和学生在电磁学谁希望获得更深入的了解到分析和实验有关这一现象，或与工业应用，如分级和校准强永磁体或测量各种金属的导电性，等几个实验和数值计算包括验证和说明的理论。
英文摘要：
An electromagnetic analysis is presented for experiments with strong permanent disc magnets. The analysis is based on the well known experiment that demonstrates the effect of circulating eddy currents by dropping a strong magnet through a vertically placed metal cylinder and observing how the magnet is slowly falling through the cylinder with a constant velocity. This experiment is quite spectacular with a super strong neodymium magnet and a thick metal cylinder made of copper or aluminum. A rigorous theory for this experiment is provided based on the quasi-static approximation of the Maxwell equations, an infinitely long cylinder (no edge effects) and a homogeneous magnetization of the disc magnet. The results are useful for teachers and students in electromagnetics who wish to obtain a deeper insight into the analysis and experiments regarding this phenomenon, or with industrial applications such as the grading and calibration of strong permanent magnets or with measurements of the conductivity of various metals, etc. Several experiments and numerical computations are included to validate and to illustrate the theory.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
