An assembly for transferring electrical energy comprises a stator. A rotor is separated from the stator for relative rotation with respect to the stator. An axial gap is defined between the rotor and the stator. A transmitter is associated with or on the stator, where the transmitter is configured to transmit an alternating current (AC) wireless signal. An annular clamp comprises a first semi-elliptical portion and a second semi-elliptical portion that define an opening for receipt of the rotor. The annular clamp has fasteners to secure the first semi-elliptical portion to the second semi-elliptical portion about the rotor. A receiver is associated with of the annular clamp.