Study on Causes and Compensation for Speed Attenuation of a Spherical Superconducting Rotor

When the superconducting magnetic suspension device is in operation, the spherical superconducting rotor will keep rotating at a high speed above 200 Hz. It brings the rotor a large angular momentum and high orientation stability, which is one of the preconditions for achieving high accuracy of the device. However, in engineering practice, due to the influence of some factors, the speed of the rotor will decay, which affects the precision of the device. In this paper, main factors that arouse the speed attenuation of the rotor were analyzed. Experiments on speed attenuation with different pressures were carried out. Compensation for the error of the drift rate arising from speed attenuation was carried out after a drift test for the device. After compensation, the drift rate decreased by 4.95% compared with the value without compensation.