The common principle is the use of the induction of an electromotive force by the variation of the magneticflux through a coil.
一般原理均是使用通过线圈的磁通量变化感应的电动势。
2
Magneticinduction intensity, magneticflux, Gauss theorem of magnetic field, Biot-Savar law, magnetic field of moved charge.
磁感应强度，磁通量，磁场的高斯定理。毕？萨定律，运动电荷产生的磁场。
3
When the vibration inductor does not vibrate, the magneticinduction element induces a fixed magneticflux of the magnetic body, and the magnetic flux is a definite value.