It is a type of electric motor that is coupled in charges, which should move without the use of reduction gears, belts and gears. There are applications that can provide suitable resolution and the model torque while others are modified in both the speed and the torque according to the required design specifications.
Among the direct drive motor of advantages there is the friction of the gears and the elimination of friction that cause the major power losses, as this type of engine has precision components and feedback system in a very compact housing.
The torque of the direct drive motor is dependent firstly, of its diameter, and the second number of teeth of which are created magnetic field so as to obtain the greatest number of drive steps. Finally, this type of motor has advantages such as high precision, higher torque at higher speeds, higher response speed and smooth rotation. https://www.mrosupply.com/electrical/plugs-and-receptacles/gfci-receptacles/1016116_cr20ip1_hubbell-wiring-devices/