The three-phase induction electric motor is also known as an asynchronous motor, precisely because it does not operate at synchronous speed. The induction motor is the most commonly used AC motor, for simplicity, rugged construction, low manufacturing cost and good operating characteristics.
When the stator winding is energized through a three-phase supply, a rotating magnetic field is created.
According to Lenz’s Law, any induced current tends to oppose the variations of the field that produced it. In the case of an induction motor, the variation is the rotation of the stator field, and the force exerted on the rotor by the reaction between the rotor and the stator field is attempting to cancel the continuous motion of the stator field. This is why the rotor accompanies the stator field as much as it allows its weight and load. buy rab ffh70 white for the best price
The three-phase induction electric motor has inductive rotor current, and is similar to a transformer with secondary rotating. It is impossible for the rotor to rotate at the same speed as the magnetic field. If speeds were equal, there would be no relative motion between them. Without induced voltage there is no torque acting on the rotor.