【作者】 鲁峰； 陈朗； 冯长根； 伍俊英；

【Author】 Feng Lu~1,Lang Chen~1,Changgen Feng~1,Junying Wu~1 (1.State Key Laboratory Explosion Science and Technology,Beijing Institute of Technology,Beijing, 100081(China)

【机构】 北京理工大学机电学院,爆炸科学与技术重点实验室；

【摘要】 采用炸药平面波冲击加载钕铁硼永磁体的方法,进行了爆炸冲击去磁脉冲放电实验,测量了输出电压及电流曲线。采用磁化电流理论模型,计算了柱形永磁体的空间磁场分布,建立了感生电动势的理论计算模型,推导了感生电动势随时间变化的动态函数。建立了爆炸冲击去磁脉冲放电实验的等效电路模型,给出了输出电流及电压的理论计算方法。计算表明,感生电动势的大小取决于磁体内的冲击波传播速度、磁体的剩余磁化强度、磁体的矫顽力、磁体半径以及线圈匝数,而和磁体的长度及最大磁能积无关,但磁体的长度会影响输出电压或电流的脉宽。更多还原

【Abstract】 The shock-induced demagnetization discharge experiments were conducted by explosive planar shock wave loading Nd-Fe-B hard ferromagnetic and the output voltage and current curves were acquired. The magnetic field of permanent magnet column was calculated according to magnetization circle current. The induced electromotive force variation with time was derived from the theoretical calculation model. Equivalent circuit model of the experiments was established to derive output current and the voltage profile. The computing results show that induced EMF depends on the shock wave velocity in magnet,remanence, coercive force,magnet radius and coil turns instead of the length and maximum magnetic energy product of the magnet.However,the length of the magnet affects impulse width of output voltage or current pulse.更多还原