Design of an Eccentric Pole Type Magnetic Geared Composite motor

A novel magnetic geared composite motor is proposed based on magnetic field modulation, integrating multiple advantages of magnetic gears. To reduce axial size, a coaxial structure is adopted, embedding a permanent magnet synchronous motor inside the magnetic gear. To minimize torque ripple, a novel structure is designed: a high-speed inner rotor with eccentric magnetic poles is connected to a cup skeleton featuring radial magnetized poles on its inner and outer walls. The outer rotor employs a magnetic geared composite motor structure arranged in a Halbach array. The magnet modulation ring skeleton is 3D printed with PLA materials to reduce weight. To assess its effectiveness, finite element method is employed for electromagnetic simulation. The comparison with traditional magnetic geared composite motors which use various magnetization methods, indicates that the novel magnetic geared composite motor effectively reduces torque ripple and also demonstrates an improvement in output torque.