The electric motor is a machine designed to transform electrical energy into mechanical energy and has evolved over time to serve diverse applications. In 1885 the Italian physicist Galileo Ferraris, based on the studies of Michael Faraday’s electromagnetic induction law shown in 1831, developed the asynchronous electric motor of alternating current which can also be synchronous or asynchronous, single-phase or three-phase.
With regard to the power supply of electric motors we have two items that we must consider; the dimensioning of the power cables and the characteristics of the service network. NBR is the acronym for Brazilian Standards of Regulation. The standards of NBR 17094 indicated for the voltages and frequencies must be complied with in relation to the characterization of the power grid. Already for the sizing of power cables of the electric motors determined by its nominal current, they must obey the indications of the NBR 5410.
As time passed, various types and models of electric motors were developed, and these were being refined according to the needs that were appearing. Today, electric motors are found in the most diverse shapes and sizes, each suited to their task, no matter how much torque or power an engine needs to develop.