Ansoft Maxwell 3D magnetic FE modelling software was used
to optimise the magnet size in order to achieve maximum open
circuit voltage. Simulation results were obtained for a selection
of magnet widths (X) and heights (Y) as shown in figure 2. D is
the distance between the magnets and was fixed at 1mm. The
depth of the magnet was fixed at 1.5mm to conform to the
existing dimensions of the beam structure. The simulations