The operation of a three-phase induction electric motor is based on the principle of electromagnetic Gates A73 Hi-Power II Belts coupling between the stator and the rotor, as there is an electromagnetic interaction between the rotating field of the stator and the induced currents in the rotor bars when they are cut by the rotating field . The spinning field is created because of the windings of each phase which are spaced apart from each other by 120 °. When feeding the windings with a three-phase system, the currents I1, I2 and I3 will cause their respective magnetic fields H1, H2 and H3, also spaced 120 ° apart.

Moreover, as the fields are proportional to their respective currents, they will be time lagged, also 120 ° apart. The vector sum of the three fields H1, H2, and H3 will be equal to the resulting total field H. The composition of the field generated by the current induced in the rotor with the rotating field of the stator will result in a force of magnetic origin which generates a torque on the motor shaft, tending to cause the rotor to rotate in the direction of the rotating field. If the torque is satisfactory to overcome the strong torque applied to the shaft, the rotor begins to rotate.