A new chapter 10 has been added to report KD 718. The title of this chapter is: “Use of a 4-pole motor frame size 112 and a 28-pole original armature”. So the original short-circuit armature is used. Grooves are made just in between the aluminium short-circuit bars and 84 magnets size 40 * 7 * 3 mm are glued into these grooves.