Study On Low Power Novel 12-Pole E-Type Tooth Hybrid Magnetic Bearing

This paper presents a novel 12-pole E-type tooth hybrid magnetic bearing (HMB) designed for high-efficiency and low-power suspension applications. The proposed HMB integrates sheet-type NdFe35SH permanent magnets with a symmetrical E-shaped stator structure to reduce energy consumption while maintaining high levitation precision. An equivalent magnetic circuit model is established to analyze the flux distribution and force generation mechanisms. Finite element simulations confirm that the magnetic force varies linearly with current, and a prototype system was built to experimentally evaluate performance. Test results show that the rotor displacement remains within ±15 μm up to 3000 rpm, and the total power loss is reduced by over 90% compared to conventional fully active magnetic bearings. These findings demonstrate the feasibility of the proposed design in compact and energy-sensitive systems such as kitchen ventilation motors and flywheel energy storage devices.