Problem 102-3    Source:  Problem prepared by the website author.

Be an armature winding of a 4-pole DC machine, lap winding, having 960 active conductors and rotates at a speed of 1,200 rpm. Since the flux per pole is equal to 0.07 Wb, find:

b) the number of paths for the electric current;

a) the voltage induced in the armature winding.

Solution of the Problem 102-3   

Item a   

The number of current paths in this machine is given by eq. 102-08, as the winding is imbricated. Let's repeat the equation below.

So, replacing the variables by their respective values, remembering that the armature is simplex, so m = 1, we found

Item b   

We are now in a position to calculate the constant K_a using eq. 102-13, shown below and knowing that Z = 960.

Then, replacing the variables by their respective values, we find