Research on Optimization Design of Double-Sided Consequent-Pole Permanent Magnet Synchronous Linear Motor

This paper proposes a double-sided consequent-pole permanent magnet synchronous linear motor (DS-CP-PMSLM) with interleaved permanent magnets (PMs). It can adjust the detent force period and symmetry, as well as suppress even harmonics of the back electromotive force (EMF). By designing the PM (<tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$W_{\text{PM}}$</tex>) and iron pole (<tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$W_{\text{IP}}$</tex>) with unequal widths and optimizing the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\alpha$</tex> coefficient (<tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\alpha_{1}=W_{\text{PM}}/\tau, \alpha_{2}=W_{\text{IP}}/\tau$</tex>) to adjust the sine of the detent force, combined with optimizing the length of the primary iron core, it is possible to suppress the detent force and thrust ripple. In order to obtain a DS-CP-PMSLM with interleaved PMs outputing greater thrust, the primary can be expanded from a single module to two or more modules. Modular optimization and resting winding phase can be used to minimize thrust ripple and maximize average thrust.