Rotating transformer for supplying the field winding in a dynamoelectric machine

An apparatus for transmission of electrical power includes an AC voltage source configured to produce AC voltage. A stator includes a primary winding arrangement electrically fed from the AC voltage source, the primary winding arrangement having at least two primary windings. A rotor includes a secondary winding arrangement inductively coupled to the primary winding arrangement of the stator, the rotor being rotatable in a rotation direction about a rotation axis. The rotation axis does not pass through the at least two primary windings, and the at least two primary windings each extend over a predetermined sector with respect to the rotation direction and are disposed offset with respect to one another with in the rotation direction.