I. Introduction
In order to meet the requirements of low loss, especially in the application of high-speed speed in vacuum environment, such as the energy storage flywheel on satellite, a new homopolar RPMB is proposed in this paper, which is called homopolar bipolar RPMB. Compared with the equalizer quadrupole RPMB, its lower magnetic field fluctuation frequency can achieve lower rotation loss, replacing the equalizer quadrupole RPMB installed in the magnetic levitation energy storage flywheel[1].