DC motors for direct current running through and turns the rotary motor Roto result, if we reverse the motor current will turn in the opposite direction. So can adjust the direction of rotation of the motor. Technical characteristics of most motor motor rotation speed (Cycle / min), high torque and low torque. But most robots need slow-motion speed and high torque moment. Therefore a gearbox that can be inserted in the DC motor to reduce the rotational speed and torque moment mourning. On the gearbox actuator specify indicators before and after the transmission only.
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