A new-type active touchdown bearing (TDB) system integrated with a centering device to eliminate the protective clearance after rotor drop in an active magnetic bearing (AMB) system is proposed. A rotor dynamic model is established on the basis of rigid rotor theory. A collision model between the support base and outer race of the ball bearing and a real-time ball bearing elastic supporting force model are established on the basis of Hertz contact theory. The dynamic model of the new-type TDB is established on the basis of vibration theory. Using these established theoretical models, the dynamic responses after rotor drops onto the new-type TDB are simulated and compared with the responses after rotor drops onto traditional TDB. Relevant experiments are conducted on an AMB test platform to verify the simulation results. The results show that the proposed new-type TDB can rapidly eliminate the protective clearance after rotor drop and can thus effectively reduce the following rotor vibrations and impacts.

提出了一种与定心装置集成的新型主动触地轴承（TDB）系统，以消除主动磁轴承（AMB）系统中转子掉落后的保护间隙。基于刚性转子理论建立了转子动力学模型。基于赫兹接触理论，建立了滚珠轴承的支撑座与外圈之间的碰撞模型和实时的滚珠轴承弹性支撑力模型。基于振动理论建立了新型TDB的动力学模型。使用这些已建立的理论模型，模拟了转子掉落到新型TDB上之后的动态响应，并与转子掉落到传统TDB上之后的动态响应进行了比较。在AMB测试平台上进行了相关实验，以验证仿真结果。