Force Ripple and Cogging Force Minimisation Criteria of Single-Sided Consequent-Pole Linear Vernier Hybrid Machines

In this paper, the force ripple and cogging force minimisation of single-sided consequent-pole linear vernier hybrid machines is investigated through the use of the Taguchi method. The study focuses on obtaining robust designs that minimise the force ripple and cogging force through optimal tapering of the translator teeth, the soft ferromagnetic consequent poles and the permanent magnets. It is found that by minimising the force ripple a better overall design solution can be found, effectively minimising both the force ripple and cogging force, while limiting the reduction in average thrust force. The percentage contribution of each parameter is analysed, from which a trend is identified and broad criteria for the taper ratios are defined.