Development of divided core motor production technique featuring assembly by press fitting

To make motors compact and lightweight yet producing high efficiency, the research on high density winding has been carried out. As a result, two new divided cores are proposed — one is a divided sliding core and the other is a divided core assembled by partial press fitting. Most conventional divided cores use welding to make the cores as a single body after winding. This conventional technique, however, reduces productivity and in some cases makes the cores less accurate because of the strain caused by welding. Instead of using welding, both of proposed cores feature press fitting to put together the divided cores. This easier method of assembly makes possible the series production of motors commensurate with the scale of production.