3. Vg = 4.44 Φ ƒNkdKp

4. Where:
Vg = generated voltage per phase (r.m.s.)
Ф = flux per pole in webers
f = frequency in hertz
N = number of turns per phase
Kd = a constant, dependent on winding
distribution
Kp = a constant, dependent on coil pitch

5. Example:
Calculate the line voltage of a 50 Hz star-
connected alternator given the following
details:

6. Ф = 0.67 Wb/pole
N = 36 turns/phase
Kd = 0.85
Kp = 0.98

7. Answer:
Vg = 4.44 x 0.67 x 50 x 36 x 0.85 x 0.98

8. Vg = 4460 V

9. Then the line voltage for a star-connected
alternator = √3 x Vg

10. = 1.732 X 4460 = 7725 V.