The first way to increase the working surface area is to enlarge the surface area ofthe pole caps. But by enlarging it, the flux will be distributed over the cross sectionand in the working surface, there will be less magnetic flux density. However, the mainconcern is the change in the braking torque generated, so the flux flow over the fluid,not over the surface area of the pole caps. Due to nonlinear behavior of magneticproperties, one cannot conclude that the braking torque will increase by enlargingpole caps’ surface area and it will decrease by reducing it. Therefore, the surface areaof the pole caps has to be optimized for maximum braking torque generation by usingproper optimization method and constraints.
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