Research on Influencing Factors of Air Friction Loss of High-speed Magnetic Suspension Motor

The air friction loss on the rotor surface of high-speed magnetic suspension motor is quite large in value. But it is difficult to be determined theoretically. Based on the fluid field analysis, this paper explores the influencing factors of air friction loss on the rotor surface of high-speed magnetic suspension motor, including rotating speed, outer radius of rotor, axial airflow velocity, air gap length, axial length, and roughness height of rotor surface. In addition, the air friction loss can be separated by measuring the total losses. Finally, the accuracy of the analysis is verified by the air friction loss experiment on a high-speed magnetic suspension motor.