Question 4
A shunt motor has the following features:
Back e.m.f (Eb) = 220V ;
Field resistance (rf) = 150W;
Field current (If) = 1.5A;
Supply current (I) = 31.5A.
Calculate the:
(i) terminal voltage;
(ii) armature resistance;
(ii) power output at the motor shaft.
Observation
The expected answers were;
(i) Terminal voltage (Vt) = rfIf
= 1.5 x 150
.
(ii) Armature Resistance: Ia ra + Eb = Vt
(iii) Po = Eb x Ia
= 220 x 30