Sun Shouqun

College of Mechanical Engineering,

University of Shanghai for Science

and Technology,

Shanghai 200093, China

Geng Haipeng

Institute of Mechatronics and

Information Systems,

Xi'an Jiaotong University,

Xi’an 710049, China

Guo Keqian

School of Mechanical Engineering &

 Automation,

Beihang University,

Beijing 100083, China

Abstract: A transient temperature field model in a thrust magnetic bearing is built in which the heat resources come mainly from the eddy-current loss of solid cores and the copper loss of coils. The transient temperature field, system temperature rise and the thermo-equilibrium state during the rotor starting-up are calculated considering only the copper loss and the eddy-current loss. The numerical results indicate that the temperatures in coils and in magnets rise rapidly, their thermo-equilibrium states are formed within a short time. The temperatures in a thrust-disk and in a rotor rise slowly, their thermo-equilibrium states are formed after a long period time. The temperatures of the thrust-disk and the rotor are far higher than the temperatures of coils and/or magnets after the thermo-equilibrium state has come into being.