Consider the two-phase synchronous machine of Problem 4.22. Derive an expression for the torque acting on the

Question:

Consider the two-phase synchronous machine of Problem 4.22. Derive an expression for the torque acting on the rotor if the rotor is rotating at constant angular velocity, such that θ0 = wt + δ, and the phase currents become unbalanced such that ia = √2Ia cos wt ib = √2 (Ia + I')sin wt. What is the instantaneous and time-averaged torque under this condition?