Design and Analysis of a Dual-Stage Magnetic Geared Machine with Halbach Arrays

This paper presents the design and analysis of a Halbach dual-stage magnetic geared machine (Halbach-DS-MGM), which integrates a consequent-pole Vernier machine (CP-VM) and a coaxial magnetic gear (CMG) with Halbach arrays. The proposed structure addresses magnetic flux leakage and transmission ratio limitations in single-stage magnetic gears through a dual-stage transmission mechanism. By leveraging the unidirectional flux concentration effect of Halbach arrays, the stator yoke thickness is significantly reduced while achieving a total gear ratio of 29.45. Comparative analysis with a commercial mechanical planetary gear module reveals that the Halbach-DS-MGM achieves equivalent rated torque (10.2 Nm) while eliminating gear backlash.