The thesis deduces the formulas to calculate the eddy current density through the Electromagnetic field theory and analyses the distribution of the eddy current in the cotyloid rotor. The result provides theory foundation for the design and analysis of the electromagnetic damper. 运用电磁场理论推导出了电磁阻尼器转子杯内的涡电流密度计算公式,分析了涡电流的分布图,为电磁阻尼器的设计和研究提供了基础。