Permanent Magnet Combined Thrust Magnetic Bearing Simulation and Experiment

Korea Electric Power Corporation(Received September 17, 2010; Revised April 15, 2011; Accepted April 20, 2011)Abstract − In this paper , an actuator model of the thrust magnetic bearing for the flywheel energy storage isderived using magnetic circuit theory. And we compared this result with finite element magnetic field analysisresult. Based on the actuator model, we made a simulation model of the thrust magnetic bearing system. Weshowed the closed loop transfer function and sensitivity function of the thrust magnetic bearing system using boththe simulation model and the experiment. The experimental result at rotation velocity 18,000rpm of thrust mag-netic bearing system is included.Keywords − thrust magnetic bearing(축방향자기베어링), flywheel(플라이휠), magnetic circuit(자기회로)