Numerical analysis of eddy current loss of high-speed axial magnetic drive spindle

Abstract

Eddy currents will be generated in the spindle baseplate to cause energy loss when the axial magnetic force drives the spindle to rotate. Based on the magnetic field theory, the eddy current loss of the outer spindle baseplate of the axial magnetic drive spindle is analysed and calculated in the paper, and the mathematical model is established. The eddy current loss calculation method of axial magnetic drive spindle is proposed, and the factors affecting eddy current loss are analysed by finite element method. According to the analysis results, measures are presented to reduce the eddy current loss: under the condition of meeting the working strength, the outer spindle baseplate should be made of materials with small conductivity and permeability, and the thickness of the outer spindle baseplate should be as small as possible. The analysis results provide theoretical support for the optimisation design and energy consumption reduction of axial magnetic drive spindle.