Brushed DC electric motor

Brushed DC Electric Motor

Brushed DC electric motor

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A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source.

Simple two-pole DC motor

The following graphics illustrate a simple, two-pole, brushed, DC motor.

<table border="0" cellspacing=10><tr><td colspan=3><center>DC Motor Rotation</center></td></tr><tr align="center"><td width=40%></td><td></td><td width=40%></td><td></td></tr><tr><tr valign="top"><td>A simple DC electric motor. When the coil is powered, a magnetic field is generated around the armature. The left side of the armature is pushed away from the left magnet and drawn toward the right, causing rotation.</td><td>The armature continues to rotate.</td><td>When the armature becomes horizontally aligned, the commutator reverses the direction of current through the coil, reversing the magnetic field.</td><td>The process then repeats.</td></table>

When a current passes through the coil wound around a soft iron core, the side of the positive pole is acted upon by an upwards force, while the other side is acted upon by a downward force. According to Fleming's left hand rule, the forces cause a turning effect on the coil, making it rotate. To make the motor rotate in a constant direction, "direct current" commutators make the current reverse in direction every...
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