Experimental Study of the Magnetic Bearings for Supporting a HTR-10GT Helium Turbine

To verify the technical feasibility of the magnetic bearings for supporting a helium turbine,a small-sized rotor simulation test rig was built based on the basic theory of the kinetic similarity.The basic structure and key parameters of the test rig were described.On the test rig,completed were a static state levitation test,bending critical speed passing test and self-balance control algorithm test.The test results show that during the static state levitation period,the vibration amplitude of the rotor does not exceed 2 μm.The PID(proportional,integral and differential) controller of the tandem phase compensator can make the rotor successfully pass through the first and second order critical speed.The self-balance control method can effectively reduce and eliminate the vibration amplitude of the rotor and narrow the variation range of the current through the coils.By the simulation test,the design principle and control method of the magnetic bearings were verified and certain design and operation experience was accumulated.