Analysis on the Magnetic Force Characteristics of Segmented Magnet Used in Large Permanent-Magnet Wind Power Generator

It is important to increase the production efficiency of large wind power generators. Because magnet segmentation reduces the size of each magnet, the segmented magnets can be fabricated relatively easily. It also features the advantages of reducing the cogging torque and improving the efficiency of permanent-magnet machines by decreasing the eddy-current loss. Despite this benefit, a disadvantage exists as the side segmented magnets could be detached from the rotor because of the magnetic force between the magnets, such as the attractive force or repulsive force. Hence, in this study, we will analyze the characteristics of the magnetic force acting on the segmented magnets and predict the events they can possibly cause.