2. Magnetic circuit

2.1 Role

The torque C developed in an electric machine is proportional to the product of the magnetic flux Φ and the induced current I; it is expressed by the relation :

There are therefore two main components in the active part of a machine:

• a set of conductors to carry the currents;

• a magnetic circuit whose main functions are :

  • the channelling of magnetic induction lines,

  • maintaining drivers,

  • heat conduction from conductors to cooling zones (ventilation ducts, air gap)....