The mechanical transmission generally present in the current prolific systems of any economic activity of a country, is based on the application of electric motors in its drive.
Nowadays these energy transformation systems, both at the domestic and industrial level, are superior in the performance of various practical applications and therefore correspond to 95% of all the main effective drives, especially in the event of combining the advantages of electric energy.
Electric motors can be assembled in several classes and types, this is mainly due to: construction quality, cooling system, electrical factors and safety situations in their employability. The main distribution is defined by the application of the type of electric current in its power, which will be alternating current or continuous.
Within each of these models it can be divided according to the type of network, that is, it requires one or three phases of excitation being in this order single-phase or three-phase and within each of these types may also be synchronous or asynchronous, obeying if the speed Of its rotor is proportional or not to the synchronism frequency. The type of motor most frequently employed in the industry is the three-phase induction motor.