... 9,12 Slots Armature--Silicon-steel Lamination with Epoxy Coating--High-Carbon Steel Shaft--Cu-Ag Alloys Commutator--Copper-graphite Brushes--Be ... Ball Bearing in Output Side4,EMI Suppression5,Low-Cogging Design6,High Degree of Protection7,Small Mechnical Time Constant8,Resist Intense ... Axial Gap10,Low noise Design11,Fast Response(Small Tm)12,High Torque at a Low Speed13,PTC Protection14,Penolic Resin ...