Influence of Stator Core Manufacturing Displacement on the Electromagnetic Performance of Modular Permanent Magnet Machine

This paper investigates the influence of manufacturing tolerances of modular stator core, including radial, circumferential and axial displacements, on the electromagnetic performance of a modular permanent magnet machine. First, the analytical analysis of no-load back electromotive force, circulating current, cogging torque and unbalanced magnetic force is derived. Second, several typical cases are selected to investigate the effects of the three displacement faults. Then, the effects of a single module under the same displacement amplitude fault are compared, and the results reveal the tolerance of electromagnetic performance to different displacements. Finally, references for the design, processing and manufacturing of modular motors are provided by the analysis results of this paper.