... rotor axial fan,ventilation fan, Duct fan, shaded pole motor, external rotor fan motor,aluminum die casting parts, stator and rotor, Developing ... , high efficiency production lines and scientific management, "low noise, high air volume, stable running and long life time" Fans has been ... (10) Illustration of Model YDK-12-41.YDK: Asynchronous motor 2. 12: Power4: 4 : Motor pole numbe, 2,4,6,8 poles 3 ...