Patent ID: 7262679
Filing Date: 2007-08-28
Classification: H01F

Abstract:
1. A high power rotary transformer for coupling electrical energy at a high power level into at least one electrical load mounted on a rotor rotatable about an axis of rotation, the transformer comprising: a stationary primary mounted in surrounding relationship with respect to the rotor, an electromagnetic shield mounted to the rotor, the shield having an exterior surface thereon, and a secondary mounted on the exterior surface of the shield, the secondary being connected in an electrical circuit with the load, whereby the application of an alternating current having a frequency of at least one (1) kilohertz to the primary produces an alternating electromagnetic field having flux lines in the secondary oriented generally parallel to the axis of rotation, the alternation of the electromagnetic field inducing a voltage in the secondary thereby generating an electric current to the load, and whereby the shield isolates the rotor from the alternating electromagnetic field to prevent eddy current heating of the rotor.