A DC motor can be operated as a motor or a generator in principle. This principle is called the reversible principle in motor theory. When the prime mover drives the armature windings to rotate between the main magnetic poles N and S, electromotive force is induced on the armature windings, and after being rectified by the brush and commutator device to direct current, it is led to an external load (or power grid) for power At this time, the motor operates as a DC generator. If an external DC power source is used to direct the DC current to the armature winding through the brush commutator device, this current interacts with the magnetic field generated by the main magnetic pole NS to generate torque, which drives the rotor to work with the mechanical load connected to it. At this time, the motor operates as a DC motor.
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