风力变小是电机那块绕组有断路的地方造成的，无锡风力风机制造有限公司电阻丝发出热量不能及时排除，所以很烫 ...可能轴承松动了,使转子碰壳,这样的话就要拆开换轴承了　无动力风机是利用自然界的自然风速推动风机的涡轮旋转及室内外空气对流的原理，将任何平行方向的空气流动，加速并转变为由下而上垂直的空气流动，以提高室内通风换气效果的一种装置。该风机不用电，无躁音，可长期运转。其根据空气自  无动力风机然规律和气流流动原理，合理化设置在屋面的顶部，能迅速排出室内的热气和污浊气体，改善室内环境。涡轮通风机是利用自然风力及室内外温度差造成的空气热对流，推动涡轮旋转从而利用离心力和负压效应将室内不新鲜的热空气排出。（图/文http://www.wxfengli.com/）
（中译英）
The wind is smaller that block motor windings are open circuit where it caused, the resistance wire heating can not be eliminated in time, so it is very hot... May loose bearing, so that the rotor shell, it will open for bearing unpowered fan is to use natural wind driven fan rotation of the turbine and interior external air convection principles, will either parallel to the direction of the air flow from bottom to top, accelerate and change the vertical air flow, so as to improve the indoor ventilation effect of a device. The fan is not electricity, no noise, long term operation. Based on the air since no fan power natural laws and air flow principle, reasonable positioned on the roof top, can quickly discharge the indoor hot and dirty gas, improve indoor environment. Turbine fan is to use natural wind and indoor and outdoor temperature difference caused by air convection, pushes the turbine to rotate thereby utilizing the centrifugal force and the negative effect of indoor fresh hot air exhaust.