Micro-torque sensor calibration instrument based on magnetic levitation effect

The utility model discloses a micro-torque sensor calibration instrument based on magnetic levitation effect. A micro-torque sensor to be calibrated is fixed on a base through a positioning block and a clasping block, a circular arc edge force arm is mounted on a rotating shaft; a high supporting leg used for adjusting the height is mounted on the bottom surface of the base fabricated, and a guide column and a guide rail are mounted on the upper surface of the base; a bearing pedestal is mounted on the guide rail, a groove is formed on the edge of the bearing pedestal, and a micro-bearing is mounted in the groove; a lead wire penetrates through the groove formed on the bearing pedestal and is hung on the micro-bearing with one end fixed on the circular arc edge at both ends of the force arm and the other end hung with a counter poise; a magnetic support is mounted on the guide column; and disc-shaped magnets are respectively mounted in the central positions of the force arm and the magnetic support. The micro-torque sensor calibration instrument can eliminate the bending moment on the rotating shaft of the micro-torque sensor to be calibrated applied by the force of gravity of the force arm in the horizontal placing status, the pure torque loading is realized, the torque is maintained at the constant value, and at the same time, the force arm stays under the levitation condition, thereby having the characteristics of simple structure, high precision and good stability and meeting the calibration requirements of the micro-torque sensor.