Patent ID: 6987344

Claim:
A rotary transformer comprising: a rotatable shaft; a drive motor connected to the rotatable shaft to drive the shaft; a rotor assembly having a rotor connected with the rotatable shaft on a first side of the drive motor connection to the rotatable shaft, the rotor assembly having rotor end windings extending axially from opposing ends of the rotor with the first rotor end windings axially positioned adjacent the drive motor and with the second rotor end windings axially positioned remote from the drive motor; a stator assembly surrounding the rotor; a slip ring assembly mounted to the rotatable shaft, a bus duct assembly mounted within the rotatable shaft comprising three phases of isolated bus where each phase of isolated bus comprises an interior bus conductor surrounded by an outer housing, the bus duct assembly extending along the rotatable shaft between the slip ring assembly and the second rotor end windings positioned remote from the drive motor to electrically interconnect the slip ring assembly to the second rotor end windings positioned remote from the drive motor, and the bus duct assembly comprising first end leads extending through openings in the shaft axially adjacent the second rotor end windings positioned remote from the drive motor for connection with the second rotor end windings.