Fan Motors by Bringsmart. Details:Description: This type is miniature Worm Gear DC Motor, which can change shaft rotation direction while the wiring positive andnegative be changed . It is also have addition two characteristics: 1. With self-locking, the output shaft can not rotation when switch off, that is self-locking. 2. Gearbox output shaft and motor shaft are come to be a rectangle, it is widely used in various of occasions that require special install size.Apply to robot, display cabinets, electric door, electric curtains, electric racks, barbecue machine, barbecue pits, electric toys,hands-on DIY, etc.What does motor torque mean? The standard torque of the motor is 10kg.cm. If the belt wheel is used for transmission, the belt wheel has a radius of 1cm, and the output tension of the belt is 10kg. If the belt radius is 2cm, the output tension of the belt is 5kg, and so on.