科研之友
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摘要
In order to further improve the output torque and transmission stability of coaxial magnetic gear (CMG), a new topology of embedded permanent magnets (PMs) is proposed in this paper, which has large torque and low ripple. In the structure, the PMs of the inner rotor are embedded into the yoke and radial magnetization is adopted. On the outer rotor, the PMs are magnetized by the Halbach array. At the same time, in this magnetization mode, the PMs with radial magnetization are moved a certain distance towards the outer rotor yoke. At this time, the gap between the PMs and the outer air gap is filled with silicon steel, so that part of the PMs is embedded in the yoke, and the parallel magnetization PMs is still in the original position. Finally, a two-dimensional model is established, and the magnetic field and torque of the model are optimized. Compared with the conventional CMG model, it is found that the improved model increases the average output torque of the inner and outer rotors by 16.08% and 16.87%, respectively, and reduces the ripple by 18.85% and 43.26%, respectively. It is proved that the topology is an effective attempt to improve the operation efficiency of CMG.
