A new parallel-hybrid-excitation linear vernier permanent-magnet machine: Improved solution for direct-driven power generation

Abstract

Tn this paper, a parallel-hybrid-excitation linear vernier permanent-magnet (LVPM) machine is proposed for direct-driven power generation. The novelty is that the air-gap flux of the proposed L VPM machine can be adjusted flexibly by injecting the appropriate DC current into the equipped DC field winding. Therefore, a high flexibility for controlling under different conditions can be achieved. Firstly, the proposed LVPM machine topology is presented. The PM segments are mounted on the mover using the consequent-pole configuration, while the DC field winding is wound in the stator yoke. Secondly, based on the magnetic network, the mathematical modeling of the air-gap flux control due to the hybrid excitation is established. Then, using the 3-D finite element method, both steady and transient performances of the proposed LVPM machine are assessed. Finally, the control for different operating conditions by adjusting the air-gap flux is also presented and discussed.