The main methods to reduce the no-load eddy current loss of permanent magnets of axial magnetic field motors include: reducing the width of the stator slot opening

increasing the length of the air gap

dividing the permanent magnet into blocks

using shielding layers and magnetic slot wedges

etc. Based on a simplified 2D analysis model of a permanent magnet axial field motor

the effects of reducing stator slot opening width and increasing air gap length

using shielding layers and magnetic slot wedges to reduce no-load eddy current losses are analyzed. The effects of different segmentation methods of permanent magnets on reducing noload eddy current losses are studied through three-dimensional electromagnetic field simulation. The research results indicate that reducing the width of the stator slot opening has the best effect; although increasing the length of the air gap can significantly reduce eddy current losses

the amount of permanent magnets used increases rapidly; the segmented permanent magnet has a better effect on reducing eddy currents

and the circumferential segmentation method is the best; the shielding layer has a counterproductive effect; the effect of using segmented magnetic slot wedges is slightly worse than reducing the width of stator slot openings

but the processing technology difficulty is lower.