Design and Analysis of Permanent Magnet Linear Generator Using FEM Based Software

Abstract

This paper presents the design of an efficient Permanent Magnet Linear Generator (PMLG). This linear generator is used for extraction of ocean wave energy. Among all, linear machines have highest efficiency because of direct wave energy conversion without need of intermediate stage. The free-piston linear generator (FPLG) is one of the major applications of PMLG. It is an energy converter which offers benefits including good efficiency, high power density, and reduced emissions. Therefore, for Hybrid Electrical Vehicles (HEVs), the FPLG is considered as a potential alternative hybrid power system. In this paper, construction and operation of PMLG is explained first. Implementation of 2D PMLG design is done using MAXWELL 2D. For designing this machine, standard design steps/methods are followed. Implementation of calculated design parameters of linear generator is done using Ansys & Maxwell software to validate output results and various flux patterns. Various design parameters such as stroke length, interior stator diameter, slot pitch, air gap, pole pitch etc. are calculated and then these analytical results used for implementation of design in Ansys and Maxwell software. 3D model of PMLG includes helix coil and magnet. Helix coil is considered as stator part and magnet will move inside it. Various results such as induced voltage, position of magnet, induced current etc. are presented in this paper.