A DC motor is any of a class of rotary electrical machines that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electro-mechanical or electronic, to periodically change the direction of current flow in part of the motor.
High Speedy and high Energetic DC Motor is DC 4 v High quality diameter & low noise high torque Carbon brush motor /long Dual shaft high power DC motor for Robotics, Small drill, Fan, Pump, Generator, etc. Specially For Small Drill Chuck.