The Three Phase Induction Motor

Electric motors act from the moment the electric current produces a magnetic field, in which when it varies in relation to a conductor, it causes an electric current. The rotor current causes a magnetic field that must oppose the motion that generated the poles opposite to that of the stator. The result is that the stator field impels the rotor at the moment of rotation, but always at a higher speed, causing the rotor to slip relative to the rotating field.    5600 OMP

When a load is placed on the motor shaft, the rotor slows down, increasing slipping. Generally, two magnets are formed, one in the stator and the other in the rotor, in which, their interaction causes the movement of the motor. In the three-phase induction electric motor, the distribution of the coils of the three phases in the stator, are lagged at 120º, and ends up making the sum of the magnetic fields generated by each of them a uniform and rotating field. This field circulates in the magnetic stator and rotor cores, and generates a current flow in the rotor bars.