论旋转磁场式Π形电磁轭的提升力  

A DISCUSSION ON THE LIFTING POWER OF Π-SHAPED ELECTROMAGNETIC YOKE OF ROTATIONAL MAGNETIC FIELD

作　　者：林锡忠 

机构地区：[1]成都华林检测研究所,成都610051

出　　处：《无损检测》2003年第10期515-518,共4页Nondestructive Testing

摘　　要：导出相位角α与夹角为θ的两相交磁场合成的旋转磁场的一般关系式 ,得出提供两相交磁场的Π形电磁轭也能在工件中产生旋转磁场的结论。它的瞬间磁场B(t)是磁感应强度峰值Bm,α和θ的函数 ;而该电磁轭的提升力 F则是Bm 和磁轭铁心截面S的函数。因此 ,该电磁轭提升力的大小不能确切反映它所能提供的BmThe formula for the rotational magnetic field composed of the cross fields with phase angle α and included angle θ was derived. It was concluded that Π shaped magnetic yoke providing cross fields could produce rotational field. The instantaneous field B(t) was the function of the peak value of magnetic induction density B m, α and θ . And the lifting power of the yoke was the function of B m and the cross section of its iron core S . Therefore, could not exactly reflect B m and magnetic induction density B of the yoke.

关 键 词：电磁检验 旋转磁场 电磁轭 提升力 

分 类 号：TH878.3[机械工程—仪器科学与技术] TG115.284[机械工程—精密仪器及机械]