Founded in 1995, Zhejiang MaEr Fan Motor Co., Ltd., has specialized in manufacturing external-rotor fans for approximately 25 years. The YWF series external rotor produced by the company has three-phase motor(S type), single-phase capacitor running motor(D type), shaded pole motor, energy-saving EC fan and motor. The rate motor speed is between 500r/min and 3000r/min, while the output power range is between 5w and 3000w, widely used in centrifugal fans axial fans.