1. Role of an electrical machine

The rotating electrical machine is an electromagnetic device designed to transform mechanical energy into electrical energy (generator operation) or, conversely, to transform electrical energy into mechanical energy (motor operation). It mainly comprises two parts that move relative to each other: the inductor, which creates a magnetic field, and the armature, in which this induced field creates an electromotive force; these two parts are separated by an air gap.

Depending on the type of machine considered, for technological reasons the inductor is located either in the stator or in the rotor.

The electric generator is irreplaceable and can scarcely be compared with other modes of production. Where there is a sufficiently powerful supply network, the electric motor has a number of advantages over other drive systems. These advantages mean...