Buy electrical fan motors, the basic working principle of DC fan motors. According to the different power supply methods, there are two types of motors: DC motors and AC motors. The fan motor used in the computer is a DC motor with a power supply voltage of +12V and a rotation speed between 1000 and 10000 revolutions per minute. A DC motor is a rotating machine that converts DC electrical energy into mechanical energy. It consists of three parts: a stator, a rotor and a commutator. The stator (that is, the main magnetic pole) is fixed on the fan bracket and is the non-rotating part of the motor. There are more than two sets of coils in the rotor, which are wound by enameled wire, called windings. When a current flows through the winding, a magnetic field is generated, and the magnetic field interacts with the magnetic field of the stator to produce force. Since the stator is fixed, the rotor rotates under the action of force. The commutator is a special device of the DC motor, which is composed of many commutator segments, and an insulating sheet is located between every two adjacent commutator segments. The fixed brush is pressed by a spring on the surface of the commutator, so that the rotating armature winding can be connected with the external circuit. When the rotor rotates through a certain angle, the commutator connects the supply voltage to another pair of windings and continues to generate a magnetic field in this winding. It can be seen that due to the existence of the commutator, the electromagnetic torque received in the armature coil remains unchanged, and the armature can be rotated under the action of this electromagnetic torque.
