Abstract:
An oblique air-gap tubular transverse flux switching permanent magnet linear motor (OATTFS-PMLM) was proposed in this paper, which synthesized advantages of both the flux switching linear motor and transverse flux linear motor. The permanent magnet and armature winding both installed on the primary of the motor. The electrical load and the magnetic load were structurally decoupled from each other. The oblique air-gap and cylindrical structure were adopted to reduce air gap reluctance and avoid transverse end effect. It has the advantages of a simple secondary structure, high reliability, and strong load capacity. The structure and driving principle of this motor were introduced. A permeance model was presented, and analytical expression of magnetic flux, no-load back-EMF, and the thrust were derived. In addition, the magnetic field and thrust were analyzed by finite element method (FEM), and the rationality and effectiveness of the proposed motor structure were analyzed by comparing with the traditional cylindrical primary permanent magnet linear motor. A prototype was tested, with back-EMF and static thrust experiments. The theoretical analyses agreed with the experimental results, which can verify the validity of the theoretical analysis and the new structure motor's principle.