Analysis of the Output Characteristics of a Superconducting Torquer for Drift Test

To determine the precision of a superconducting magnetic suspension device, drift test for the device should be carried out with a torque feedback loop. The torquer is one of the crucial actuators of the loop. To design the torque feedback loop, the function relationship between the output torque of the torquer and the input current is required to be found out as well as the ability of the superconducting torquer to adjust the rotor at rated speed. In this paper, influences of two key factors on the output characteristics of the superconducting torquer were analyzed. The output torque of the torquer was calculated when the input current ranged from 0 to 10 A. The result showed that the output torque was proportional to the square of the input current of the torquer. Based on this, the ability of the superconducting torquer to adjust the rotor at high rotary speed was analyzed. All of these provide a necessary basis for the design of the torque feedback loop next step.