Question

The breadth factor of 3rd harmonic emf of a 3-phase, 4-pole,synchronous machine having 36 stator slots is(a) 0.47 (b) 0.53 (c) 0.67 (d) 0.73

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Answer 1

The value of Kd factor is 0.67

Explanation:

We are given that:

Harmonic factor "n" = 3

Number of slots = 36,

Phase" P " = 4 and 3

Solution:

Kd  = sin mn  θ / 2 ÷  m sin n θ / 2

Kd  =  sin 3 x 3 x 20/2 ÷ 3 sin^3 x 20 / 2

Kd = 0.666

Kd = 0.67

Thus the value of kd factor is 0.67