The Double Permanent Magnet Vernier (DPMV) machine is well known for its high torque density and magnet utilization ratio. This paper aims to investigate the torque generation mechanism and its improved design in DPMV machines for hub propulsion based on the field modulation principle. Firstly. the topology of the proposed DPMV machine is introduced. https://www.findingthestory.com/product-category/hole-reamer/