As a result , the electromagnetic field intensity is changed accordingly and fluctuating current in the damper coil is created . damping force is mostly produced because of the phase difference between fluctuating current and displacement of rotor . the formulas of fluctuating current and damping coefficient are deduced theoretically , and the calculated results are consistent with the experimental results 通过分析发现电磁阻尼器线圈内由于转子涡动时变化的磁场而产生的波动电流与转子位移间的相位差是产生阻尼的主要原因，推导了波动电流、阻尼系数的计算公式，并通过实验展示了被动式电磁阻尼器的阻尼效应。
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