Lorentz Magnetic Bearing for Novel Vernier Gimballing Magnetically Suspended Flywheel

To remedy the limitations of the magnetic resistance type magnetic bearing with negative deflection torque and Lorentz magnetic bearing with poor gas flux density uniformity, a novel vernier gimballing magnetically suspended flywheel is presented. And its composition, operating principle and scheme of the Lorentz magnetic bearing are introduced. The equivalent magnetic circuit method is applied to the magnetic analysis of the Lorentz magnetic bearing, and its mechanics models of the radial deflection torque and translational levitation force is got. By comparatively analyzing the magnetic density with the electromagnetic numerical analysis method, the sphere trapezoid permanent magnet is adopted. Upon this, by combining the technical index of the vernier gimballing magnetically suspended flywheel with an angular moment of 15 Nms, the Lorentz magnetic bearing is designed in detail. According to design results, the vernier gimballing magnetically suspended flywheel is manufactured, and the air gap magnetic density is dynamically measured by the linear magnetic density hall sensors. The results have a good agreement with the design values, which has important significance in the design of flywheel system.