In this paper, an investigation into different magnetisation topologies for a Long Stator Tubular Permanent Magnet Linear Generator (LS-PMLG) is performed through a comparison based on the cogging force disturbance, the power output and the cost of the raw materials of the machines. The results obtained from the FEA simulation are compared with an existing linear generator described in [1]. To ensure accurate results, the generator developed in [1] is built with 3D CAD and simulated using Finite Element Method (FEM) and the obtained results are verified with the source.