A new chapter 6 has been added to report KD 645. The tittle of this chapter is: “Alternative winding with 15 coils”. The original winding has a 1-layer winding with two coils per phase, so totally six coils. The alternative winding has no sleeves in the Delrin bush but thirty 8 mm holes. The armature has a length of 80 mm in stead of 100 mm and one magnet size 80 * 20 * 10 mm is used in each groove. It is expected that the reduction of the power because of the shorter armature is compensated because now per phase five coils are used in stead of two coils.