能量法求解电磁力的理论基础  

THEORETICAL BASIS OF SOLVING ELECTROMAGNETIC FORCE BY ENERGY METHOD

作　　者：骆超艺 LUO Chaoyi(Fujian Key Laboratory of Opto-electronic Technology and Devices,School of Opto-electronic and Communication Engineering,Xiamen University of Technology,Xiamen 361024)

机构地区：[1]厦门理工学院光电与通信工程学院福建省光电技术与器件重点实验室,福建厦门361024

出　　处：《物理与工程》2021年第6期38-41,共4页Physics and Engineering

基　　金：福建省中青年教师教育科研项目(JAT190678)。

摘　　要：为了证明磁场能公式适用于媒质运动的情况,在磁准静态条件下,推导了磁场力对运动媒质做的机械功率和感应电场对自由电流做的功率,验证磁场能量公式满足普遍情况下的功能关系。结果表明,对于磁各向同性的刚性媒质,磁场能与媒质运动和电流建立的过程无关,只与系统的状态有关。该结论为虚位移法计算磁场力或磁力矩提供重要的理论依据。In order to prove that the magnetic energy formula is suitable for the case of medium motion,under quasi-static magnetic conditions,the mechanical power of magnetic force on moving medium and the power of induced electric field on free current are derived,and it is validated that the magneticenergy formula satisfies the general work-energy relation.The results show that for rigid media with magnetic isotropy,the magnetic energy has nothing to do with the movement of the medium and the establishment of the current,but only with the state of the system.This conclusion provides an important theoretical basis for the virtual displacement method to calculate the magnetic force or magnetic torque.

关 键 词：虚位移法 电磁力 电磁功率 电磁能量 

分 类 号：O441[理学—电磁学]