In principle on a DC motor can either run as a motor, brushless DC motor can be used as hair motor running. Just different external conditions. If you drag the armature with a constant speed of rotation of the prime mover, it can lead to a DC electromotive force from the brush end. As the DC power supply to the load. If the DC voltage is applied to the brush terminal, the motor can drive the mechanical load of the rotary shaft, thereby to convert electrical energy into mechanical energy. This same principle motor or motors can make the motor run for the hair, in theory, called reversible motor works.
　　DC gear motors, gear motors that are based on the common DC motor on, plus ancillary gear box. Gearbox's role is to provide a low speed, large torque. Meanwhile, a different reduction ratio gear box can provide different speed and torque. This greatly improves, nidec motor DC motor usage in the automation industry. Refers to the integration of body gear motors and gear motors. This integration may also be referred to as the body usually geared motor or gear motor. After integration usually assembled by a professional supplier of complete sets of gear production plant. Gear motors are widely used in the steel industry, machinery industry and so on. The advantage of using the deceleration of the motor is to simplify the design, servo save space.