Research on Analysis and Compensation Method of Remnant Magnetic Moment for Magnetically Suspended Reaction Flywheel

To analyze and minimally design the remnant magnetic moment(RMM) for a magnetically suspended reaction flywheel,a method based on the equivalent magnetic dipole model is proposed.Firstly,the space magnetic field distribution can be achieved by finite element analysis,and then through selecting the magnetic field distribution of three feature planes,the RMM can be derived.The values and range of the RMM of a prototype are investigated in different operation situations.Based on the above analysis,an optimal design and magnetic compensation method for reducing the RMM is proposed.The analytical results show that the RMM can be effectively reduced to a certain range by a magnetic symmetric design of the magnetic bearings and compensation with a permanent magnet.The experimental results of a prototype demonstrate the validity of the analysis and compensation method.