Analysis and Evaluation of a Linear Primary Permanent Magnet Vernier Machine With Multiharmonics

This article investigates a multiharmonics linear primary permanent magnet vernier machine. With the adoption of nonuniformly distributed PM arrays along the air gap, richer harmonics are achieved and make its performance superior to the conventional linear primary permanent magnet vernier machine. First, the structures are described and compared. Then, their operation principles are analyzed by the flux modulation theory. The electromagnetic performances of two machines are analyzed and compared through the finite element method and theoretical analysis. The results show that the multiharmonics linear primary permanent magnet vernier machine offers 15% higher thrust force density compared with the conventional linear primary permanent magnet vernier machine. Finally, the experiments on a prototype of the multiharmonics linear primary permanent magnet vernier machine are carried out for validation.