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Principle of Operation of the Induction Motor

The induction electric motor is an engine that bases its working principle on creating a rotating magnetic field.

Magnetic fields are measured through a magnitude called magnetic induction (symbolized by the letter B), whose unit is the Tesla (T). The value of B is greater in regions where the lines are more concentrated.

The field winding can be single-phase or three-phase. The way this winding is built determines the number of motor poles, among other operational features. Its ends (terminals) are extended to a terminal box, where the connection can be made to the mains power supply.

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In the region around a magnet happen some special phenomena, like the attraction of iron fragments or the deviation of the needle of a compass. It is said that in this region there is a magnetic field, which can be represented by induction lines.

In an induction electric motor, the speed of rotation is different from the speed of synchronism. This fact is because there is a difference in speed between the rotor and the rotating field of the stator. At this speed difference is given the name slip.

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