I have attached a picture of Reluctance motor setup. When I turn on the AC source, Magnetic flux lines will build up. My question is, will the magnetic flux will be a function of the angle turned by the ferromagnetic rotor w.r.t. d-axis? Magnetic flux is undoubtedly varying in the time domain. Is it the only variable its depending on? Or it will be a function of $\theta$ also? Please explain.