Phase angle difference between the induced EMF in the rotor and the rotating magnetic field in three phase induction motor

Question

I have been studying the three phase induction motor and in the process I could not exactly understand the EMF generation in the rotor.

From figure(2) below, it is understood that the maximum EMF is produced in the rotor's coil when the maximum flux density is interacting with that particular phase.

So,does that mean the EMF so produced is in phase with the flux density wave?

From the figure below, if the induced EMF lags the RMF by 90 degrees then how come the EMF can be of maximum where the flux density wave is maximum in the first case ?

Does the above situation have anything do with understanding the term phase angle and mechanical angle?

If the induced EMF lags the flux wave that produced it by 90 degrees, then why do the figures above show that the maximum voltage is induced where the flux wave cutting action is maximum?

Answer 1

From Fitzgerald, Kingsley, Umans, Electric Machinery, 4th ed.:

Fig 9-5(a) shows voltage in each bar induced by flux-density wave. Fig 9-5(b) shows current lagging rotation and voltage by power factor angle. Fig 9-5(c) shows MMF wave lagging rotation by 90 degrees plus power factor angle.