Comparative Study on a Novel Consequent-Pole Modular Linear Vernier Machine with PMs on Both Mover and Stator Iron Cores

Linear permanent magnet vernier machine (LPMVMs) are attracting more and more attentions recently due to its high thrust density, high efficiency and simple structure at low speed operation, which make it a preferable solution for the direct-drive linear motion applications. In order to further reduce the thrust ripple of the LPMVM, a novel consequent-pole modular linear permanent magnet vernier machine (CM-LPMVM), in which the dual flux modulation effect is adopted, is proposed and analyzed in this paper. Albeit the structure is simple, the proposed CM-LPMVM exhibits a low thrust ripple (~3.2% of the average thrust) and high thrust density (~340kN/m
³
) at a low current density of 3A/mm
²
at the same time. The superiority of the proposed CM-LPMVM is verified by the results of finite element method (FEM).