- When DC voltage is applied to the DC motor, there is a flow of current through the armature windings.
- The current flowing in the armature interacts with the magnetic field produced by the stator either through field windings or permanent magnets.
- The rotor or armature is a current-carrying conductor placed inside a magnetic field.
- When a current carrying conductor is placed in a magnetic field, it experiences a force that makes the rotor rotate.
- The working principle of a DC motor is governed by Fleming’s left-hand rule. According to this rule, if the thumb, forefinger, and middle finger of the left hand are stretched out mutually perpendicular to each other, the thumb represents the direction of motion (force), the forefinger represents the direction of the magnetic field, and the middle finger represents the direction of current.
- The commutator changes the direction of current periodically so that rotation is continuous in one direction.
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