在电机和变压器内，常把线圈套装在铁芯上。当线圈内通有电流时，就会在线圈周围的空间形成磁场，由于铁芯的导磁性能比空气好得多，所以绝大部分磁通将在铁芯内通过，这部份磁通称为主磁通。
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电流通过其在电机中产生主磁通的绕组称为励磁绕组。
The winding through which a current is passed to produce the primary source of flux in the machine is called the field winding.
提出采用主磁通与漏磁通相结合的方法检测在用油管剩余壁厚的方法。
A measuring method combining main magnetic flux and magnetic flux leakage for approaching the residual wall thickness of the oil well tubing in-service was presented.
该原理通过消去变压器回路方程中直接体现主磁通的非线性项，构造了仅含漏电感和绕组电阻的二端网络。
On basis of transformer loop equation, a novel principle of transformer protection using equivalent instantaneous leakage inductance is presented.
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