An induction motor is a motor that uses an AC power source and its working principle is based on the law of magnetic induction. In the exhaust fan, the main function of the induction motor is to drive the fan blades to rotate, so as to make the air flow. Below we will detail how induction motors work on exhaust fans.
1. Composition of induction motor
An induction motor consists of two parts, a stator and a rotor. The stator is a stationary magnetic field system consisting of stacked iron cores and coils. The rotor is a rotating part consisting of an iron core and copper coils. When energized, the current in the stator generates a rotating magnetic field, which interacts with the copper coils on the rotor to generate an induced current, which causes the rotor to spin.
2. Working principle of induction motor
In an exhaust fan, the operation of an induction motor can be divided into the following steps:
(1) Energizing: Connect the induction motor to the power supply, and current starts to flow in the stator coils, thereby generating a rotating magnetic field.
(2) Rotating magnetic field induction: The rotating magnetic field will interact with the copper coil on the rotor to generate an induced current. This induced current creates a rotating magnetic field in the rotor, which causes the rotor to turn.
(3) Rotor movement: The movement of the rotor will drive the fan blades to rotate together, so that the air will flow and play the role of exhaust.
(4) Braking: When the power is disconnected, the rotor of the induction motor will continue to rotate due to inertia. In order to stop the rotor, it is necessary to use a brake or apply a recoil electromotive force to stop the rotor.
3. Characteristics of induction motors
Induction motors have the following advantages in exhaust fans:
(1) Good stability: The stator coil of the induction motor is not affected by the rotor, so the stability of the motor can be guaranteed.
(2) High efficiency: Induction motors have higher efficiency than other types of motors.
(3) Low maintenance cost: The induction motor has no wearing parts such as carbon brushes and oil-immersed bearings, so the maintenance cost is low.
(4) Long service life: Since there are no wearing parts such as carbon brushes and oil-immersed bearings, the service life is long.
4. Application field of induction motor
Induction motors are widely used in household appliances such as exhaust fans, air conditioners, refrigerators, washing machines, and rice cookers. Its stability, high efficiency and durability make it one of the most common types of motors.
In short, the working principle of the induction motor on the exhaust fan is based on the AC power supply to generate a rotating magnetic field, so that the rotor rotates, and then drives the fan blades to rotate together to play the role of exhaust. Its stability and high efficiency make it one of the most common motor types used in a wide variety of household appliances.
