Induction motor (Asynchronous Machine) is also known as AC asynchronous motor, that is, a rotating conductor-the rotor is placed in a rotating magnetic field, and under the action of the rotating magnetic field, it obtains a rotational torque and rotates.
The rotor of the asynchronous motor is a rotatable conductor, and the stator is the non-rotating part of the motor, whose main task is to generate a rotating magnetic field. Rotating magnetic fields are not achieved mechanically. Instead, alternating current is passed through several pairs of electromagnets to make the magnetic pole properties change cyclically, so it is equivalent to a rotating magnetic field.
Through the relative movement of the rotating magnetic field generated by the stator and the rotor winding, the rotor winding cuts the magnetic induction line to generate an induced electromotive force, thereby generating an induced current in the rotor winding. The induced current in the rotor winding interacts with the magnetic field to generate electromagnetic torque to make the rotor rotate.
When the rotor speed gradually approaches the synchronous speed, the induced current gradually decreases, and the generated electromagnetic torque also decreases accordingly. When the asynchronous motor works in the motor state, the rotor speed is lower than the synchronous speed.
The rotational speed of the rotor is always slower than the rotational speed of the stator’s rotating field, so it behaves asynchronously. Due to the existence of slip, the conductor cuts the magnetic field line in the magnetic field, and induces current in the conductor, and the name “induction motor” comes from this.