Analysis of a Novel Consequent-Pole Dual-Stator Linear Permanent Magnet Vernier Machine Employing Mover Slot PM

Abstract

This paper proposes a novel consequent-pole dual-stator linear permanent magnet vernier machine (DS-LPMVM) with PM in the mover slot opening, which has a bi-directional flux modulation effect. The novelty of the proposed machine consists of consequent-pole double-sided topology with toroidal windings placed in the mover slot, as well as PMs both on the stator and mover slot to improve the air gap magnetic field. The dual-stator adopts misalignment structure to suppress detent force and produce steady thrust. The electromagnetic parameters of the proposed DS-LPMVM are evaluated and quantitatively compared with the conventional linear permanent magnet vernier machine (C-LPMVM) in terms of air-gap flux density, no-load back EMF, inductance, and thrust. The geometrical parameters are designed to reduce the detent force. By analyzing the optimized structure parameters of the two machines, the good electromagnetic performances of the proposed machine are verified by the finite element method (FEM) and semi-analytical method, and both results of the two methods are basically the same. It is found that the amount of PMs for the proposed machine is reduced by 20% compared to the C-LPMVM, but the average thrust is increased by 20.7% and the thrust ripple is reduced to 4.04%. The results show that the proposed DS-LPMVM has better flux modulation effect and thrust characteristics than C-LPMCM. Finally, a 12-slot, 10-pole pairs prototype was manufactured and tested. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.