Electromagnetic and FEM analysis of a novel electric driving knitting needle of moving coil stack PMLM schema

Abstract

Abstract A novel electric driving knitting needle of moving coil PMLM schema is put forward in this paper. Magnet elements are arranged in a matrix form and 3-phase coil windings are epoxy packaged as the knitting needles that reciprocating along the air gaps inside the magnet matrix. Both the static magnetic flux density in air gaps and the unbalanced magnetic force on each magnet element are put forward in analytical formula. 2D and 3D FEM analysis have been carried out both in static magnetic field analysis and transient electromagnetic field analysis. It’s verified that both the structure rigidity and the motion performance are safe, and the performance of approximately 7 N peak hauling force and 20 mm movement at 20 Hz are able to be fulfilled. Future research will be reported and focused on the prototyping and the driving circuit & control strategy.