Novel force ripple eduction method for a moving-magnet linear synchronous motor with a segmented stator

This paper concerns the analysis of and force ripple reduction method for a moving-magnet linear motor with a segmented stator. The system consists of multiple individually excited three-phase stator segments with an iron core and coils with concentrated windings and one translator with permanent magnets. Because of the segmentation of the stator, the translator experiences force ripples when it moves from one stator segment to the next. A segment of the structure, consisting of one stator segment and one translator, has been analyzed using 2D and 3D FEM and the sources of the force ripples have been identified. A novel commutation algorithm, which calculates the three-phase currents based on the EMF waveforms, to compensate the force ripples has been implemented, experimentally verified, and compared to a traditional (dq0-based) commutation algorithm.