Accuracy Analysis and Motion Control of Two-axis Nonmagnetic Turntable Based on Ultrasonic Motor

In the calibration process of the positioner, it is necessary to test the rotation accuracy of the turntable than the accuracy of the target gyroscope to achieve the test and calibration of the positioner so as to obtain the accurate angular position information of each axis of the turntable. Therefore, this study used the nonmagnetic technology to explore the pointing accuracy and motion control of the turntable. Meanwhile, the influence of grating installation error on precision detection was analyzed. The influence of the steady-state error of turntable on the motion accuracy of the turntable was also analyzed. Finally, the influence of servo control parameters on the dynamic performance of turntable and the influence on steady-state error were analyzed. The test of the corner positioning accuracy of the turntable was carried out. The positioning accuracy and motion control parameters of the two-axis precision nonmagnetic turntable were obtained, and the PID adjustment was introduced to make the accuracy index of the nonmagnetic turntable meet the requirements. The turntable could realize the nonmagnetic working environment and achieve the high precision required by the index under the driving of the ultrasonic motor.