Coupling Analysis of Multi-physical Fields of Magnetic Gear Motor with Nonuniform Air-gap Halbach Array Magnetization

|In this paper, a novel magnetic gear motor (MGM) with nonuniform air gap Halbach array magnetization is proposed to study the in(cid:13)uence of temperature change on its electromagnetic performance. The inner PM adopts the Halbach array magnetization structure, which makes the inner rotor air gap have an uneven air gap structure, thereby improving the air gap (cid:13)ux density. In addition, the air gap magnetic (cid:12)eld of MGM is analyzed by the (cid:12)nite element method (FEM), and the 3D model of the motor is established. The main losses of the motor, including copper loss, eddy current loss, and hysteresis loss are coupled to each component as a thermal source and studied by magneto-thermal coupling. The transient variation characteristics of loss distribution during MGM operation are comprehensively considered. The temperature variation of each component of the MGM with time during load operation is studied in detail. The results show that the temperature of the PM of the MGM is close to 91.8 ◦ C when the rated load is running, and the PM of the motor does not undergo irreversible demagnetization.