A P-pole machine has a sinusoidal field distribution as shown in Fig. P5.38. The armature carries a uniform current sheet of value J A/m causing a triangular mmf distribution as shown in the figure.
The machine has an axial length of l and a mean air-gap diameter of D.
(a) Find the peak value of the armature mmf.
(b) Derive an expression for the electromagnetic torque developed.
