Abstract:Aiming at the measurement requirements of high radiation and attached space microthrusters, such as alpha decay microthrusters, a new vacuum dynamic microforce measuring platform based on high temperature superconducting maglev device is proposed in this paper. An experiment condition of low temperature, low pressure and low resistance is established by liquid nitrogen, molecular pump and high temperature superconductors, which avoids the existence of contact resistance. In the experiment, the hard magnetic rotor will suspend on the superconducting guide rail for a single degree of freedom plane rotation. A photoelectric speed measurement system is used to perform long term monitoring on the motion state of hard magnetic rotor remotely, the micro force measurement is achieved and the possible radioactive hazard is reduced. The paper introduces the key subsystems of the microforce measuring platform, analyzes the motion characteristics and force measuring mechanism of the microforce measuring platform. In addition, the experiment flow chart and data processing method are given. Calibration test was conducted, and after calibration the platform can realize the measurement of the thrust less than 1 μN. The resistance of the platform is as low as 511±35 nN, and the bottom boundary of micro force measurement is 66 nN. .txt