Problem 102-7
Source: Problem prepared by the website author.
A machine with 6 poles generates an armature voltage EA = 300 V when operating at a speed of 1,200 rpm.
The number of slots in the armature is 25 and the flux per pole is 0.02 Wb. The armature winding is of the wavy type
with multiplicity 2. Find:
a) the machine constant Ka;
b) the number of active conductors, Z, in the rotor;
c) the number of conductors per slot.
Solution of the Problem 102-7
Using eq. 102-13 and, after some algebraic work, we can calculate the constant Ka of the machine, or:
To find the number of active conductors in the armature, we will use eq. 102-14.
Working algebraically the equation, we obtain:
Because the winding is duplex wave, we use eq 102-10, where we find a = 2 m = 2 x 2 = 4.
And to find the number of conductors per slot, simply divide the number of active conductors by the number of slots in the rotor. So:
