7-Variable Speed Driver

The equivalent diagram gives the equations of the shunt DC machine:

, ,

• : number of pairs of poles

• number of winding paths;

• : number of active drivers;

• : useful flow by poles in Webers;

• : speed of rotation in rps;

• : speed constant;

• : power absorbed in W;

• : electromagnetic power in W;

• : electromagnetic torque in Nm

A phase of an asynchronous machine brought back to primary allows us to define the following equivalent schema:

The power transmitted to the rotor is given by the relations:

and

From there we can write:

The study of this relationship shows that the maximum torque is

and

• : electromagnetic torque;

• : number of pairs of poles;

• : rotor resistance;

• : pulsation of the network;

• : rotor reactance;

• : supply voltage;