Brushed DC electric motor

Common card · No. 320406

A brushed DC electric motor is an internally commutated electric motor designed to be run from a direct current power source and utilizing an electric brush for contact. Existing DC generators use a commutator to achieve DC output instead of AC output, without commutation of voltage or current. However, because the rotor rotates, the existing voltage-time curve resembles y = a |sin(t)|, causing the voltage to not always be at its maximum output voltage. If the rotor's motion were changed from rotation to repeatedly oscillating and cutting the magnetic field lines perpendicular to them, the voltage output efficiency could be increased, making it closer to a straight line, i.e., y = a. The higher the oscillation frequency, the closer it should be to a straight line. Brushed motors were the first commercially important application of electric power to driving mechanical energy, and DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings...

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