铁心中就产生交变磁场。
该方法包括 对线圈施加交流电以产生交变磁场；
The method includes the following steps: exerting alternating current on the coil to generate an alternating magnetic field;
通过动力电缆给井下直线电机供电后产生交变磁场，永磁体动子在交变磁场作用下带动泵柱塞上下往复运动，从而达到举升抽油的目的。
Under the action of variation magnetic field, the permanent magnet moving-coil drives the plunger pump to move up and down and lift oil up to ground.
铁磁材料在交变磁场的作用下，产生的巴克·豪森效应，可作为无损检测材料残余应力的一种新方法。
Barkhausen effect is produced by ferromagnetic material under varying magnetic field, it can be used as a new method for nondestructive testing of residual stress.
分析了处于交变磁场中的磁性杂质颗粒的受力情况，比较了由交变磁场和稳恒磁场产生的磁场力。
The force acting on the magnetic impurities in alternative magnetic field was analyzed , and the magnetic forces formed in alternative and steady magnetic field were compared.
实验表明，该模型在交变磁场的作用下，微执行器将做高频率划动，使水下微机器人模型能够在水中产生运动。
Through these experiments, we find that the micro actuators vibrate in high frequency under the action of the alternating magnetic field, which make the micro robot model move forward in the water.
当振管垂直立于磁场环境中时，在交变磁场的作用下产生磁致伸缩，即沿振管的轴向作简谐振动。
Vibration tube in the magnetic field vertically brings about magnetostriction under the effect of alternate magnetic field, that is axis resonance.
结果表明，此现象产生于螺线管交变磁场中的自感应作用，对于碰聚焦点不产生影响。
It is shown that the phenomenon is due to self-induced action in alternative magnetic field of electric solenoid and is of no effect to the point of magnetic focusing.
结果表明，此现象产生于螺线管交变磁场中的自感应作用，对于碰聚焦点不产生影响。
It is shown that the phenomenon is due to self-induced action in alternative magnetic field of electric solenoid and is of no effect to the point...
该装置包括位于所述的交变磁场中的多个探头，用来感应所述的交变磁场以产生感应电动势；
The device includes a plurality of probes in the alternation magnetic field for inducing the alternating magnetic field to generate the induced electromotive force;
该装置包括位于所述的交变磁场中的多个探头，用来感应所述的交变磁场以产生感应电动势；
The device includes a plurality of probes in the alternation magnetic field for inducing the alternating magnetic field to generate the induced electromotive force;
应用推荐