... But when Z2machine is equipped with ride style fan or double fan and speed indicating generator, it has compact ... motor adopt drop-preventing, prevent drop, self fan cool, uniaxial structure. It is suitable for ... Armature: composed of shaft, magnetic core, coil, fan, commutator etc. Shaft is made of high quality ... , 7~11 made of traditional disport V style steel structure. 4.brand of bearing reference ...