What happens when the rotor winding of the control transformer is perpendicular to the magnetic field?

When the rotor winding of the control transformer is positioned perpendicular to the magnetic field, no coupling occurs. This is due to the fact that electromagnetic induction relies heavily on the alignment of the magnetic field with the conductive loops of wire in the rotor. For induced voltage to be generated, the rotor must cut through the magnetic lines of force effectively, which cannot happen when positioned perpendicularly. In this orientation, the magnetic field does not link with the rotor windings, thereby preventing induced currents and resulting in a complete lack of electromagnetic coupling between the rotor and the stator.

In contrast, when the rotor is aligned with the magnetic field, a stronger interaction occurs, aiding in the efficient transfer of energy. This difference in orientation is crucial for the function of transformers and similar devices, highlighting the importance of aligning components in a manner that optimizes electromagnetic interactions.