DC motor


DC motor




A DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy. The main principle behind the workings of a DC motor is the electromagnetic law according to which a current carrying conductor placed in magnetic field experiences a force. The applied direct current converts the electrical energy into the mechanical energy because of the interaction of two magnetic fields. One field is produced by the permanent magnet and the other is produced by the electric current flowing through the armature winding. Because of the interaction of these two fields, the armature experiences a force which tends to rotate the rotor. A DC motor is equipped with magnets, either permanent magnets or electromagnetic windings, that produce a magnetic field. In a DC motor, the magnet forms the stator, the armature is placed on the rotor, and a commutator switches the current flow from one coil to the other. The commutator connects the stationary power source to the armature through the use of brushes or conductive rods.