如果有一个电流通过线圈，并激发出磁场，相应的，根据另一个方程激发出电场，并产生电流。
If you have a current passing in the loop that causes a magnetic field and, in turn, for the other equation that causes an electric field, which in turn causes a current.
铁磁性轴颈处在由激发线圈激发的磁场内。
A ferromagnetic shaft journal is suspended in a magnetic field which is excited by surrounding excitation coils.
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