A.1 A 3$\phi$, star-connected synchronous generator has four rotor poles, which produce a space flux density distribution as follows:
$B(\theta) = 1.00 \sin \theta + 0.4 \sin 3\theta + 0.2 \sin 5\theta$
The stator has 36 slots and a balanced three-phase double-layer winding. The coil pitch is 140°.
Determine, in terms of the rms fundamental voltage $E_1$:
(a) The rms value of the phase voltage $E_{LN}$.
(b) The rms value of the line-to-line voltages $E_{LL}$.