BIG DC TOY MOTOR
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A Big DC motor is a mechanically commutated electric motor powered from direct motor (DC). It is of 2000 rpm. The stator is stationary in space by definition and therefore its current. The current in the rotor is switched by the commutator to also be stationary in space. This is how the relative angle between the stator and rotor magnetic flux is maintained near 90 degrees, which generates the maximum torque.