The design of the force actuator used in extreme low temperature environment

摘要

The existing force actuators cannot work properly in the Antarctic under the condition of low temperature. In this paper, a new design scheme of force actuator is put forward. Combined with the actual situation and the requirement of thin mirror active optical experiment system, we design the force actuator structure which combined the active support and passive support, and use a s-shaped load-cell to realize the force feedback controlling. Passive support part is responsible for the adjustment of large travel with low precision, and active support part driven by PZT is responsible for the adjustment with high accuracy. Finally, test was carried out through the open loop and closed loop experiment in low temperature environment. The experimental results show that: The force actuator's output force is 120 ~ 280N, the accuracy is better than 0.05 N, meeting the requirement for the high precision under low temperature. The new kind of force actuator can be applied to the active optical support system in the Antarctic, and at the same time can also be applied to other structures of precision adjustment.