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Mike Howell EASA Technical Support Specialist
Induction motor stator cores can be manufactured using single-piece laminations (see Figure 1 left) up to an outside diameter of about 48 inches (1200 mm). For larger stators, or when minimizing scrap material, the stator laminations are segmented (see Figure 1 right). The typical circumferential gap between segmented laminations is only around 0.012 inches (0.3 mm), so it is exaggerated in the included figures. The number of segments chosen by a manufacturer for a given design can depend on several factors, some technical and some economic. For most service center repair activities, machines with segmented lamination stators are processed no differently than those with single-piece laminations. However, there are a few areas worth exploring that could be helpful when working with segmented lamination stators.
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