Induction engine , also known as "asynchronous motor", is the rotor placed in the rotating magnetic field, under the action of the rotating magnetic field, to obtain a rotating torque, so the rotor rotation device.A rotor is a rotatable conductor, usually in the shape of a squirrel cage.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 used in a pair of electromagnets to change the properties of their poles in a circular manner, thus acting as a rotating magnetic field.Unlike dc motors, this type of motor does not have a brush or collector ring. Depending on the type of alternating current used, there are single-phase motors and three-phase motors. Single-phase motors are used in washing machines, electric fans, etc.Three-phase motors are used as the plant's power equipment.
The working principle of induction motor is as follows: through the relative motion of the rotating magnetic field generated by the stator (its rotational speed is synchronous speed N1) and the rotor winding, the rotor winding cuts the magnetic sensing line to generate the induced electromotive force, so as to generate the induced current in the rotor winding.The induction current in the rotor winding interacts with the magnetic field to produce electromagnetic torque and rotate the rotor.When the rotor speed gradually approaches the synchronous speed, the induction current gradually decreases, and the electromagnetic torque generated also decreases accordingly. When the asynchronous motor is working in the motor state, the rotor speed is less than the synchronous speed.Slip is introduced to describe the difference between rotor speed N and synchronous speed N1.