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An electrical power generation apparatus is embedded in a contra-rotating propulsion system that includes overlapping first and second shafts operatively connected for counter-rotation about a common axis. The electrical power generation apparatus includes a winding mounted to one of the shafts and

An electrical power generation apparatus is embedded in a contra-rotating propulsion system that includes overlapping first and second shafts operatively connected for counter-rotation about a common axis. The electrical power generation apparatus includes a winding mounted to one of the shafts and a field array mounted to the other of the shafts adjacent to the winding. Relative rotation of the winding and the field array induces electrical current in the winding.

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1. An electrical power generation apparatus comprising: a first shaft;a first winding mounted to said first shaft and including a plurality of coils arranged for revolution about said common axis;a first electrical load mounted to said first shaft and electrically connected to receive electrical cur

1. An electrical power generation apparatus comprising: a first shaft;a first winding mounted to said first shaft and including a plurality of coils arranged for revolution about said common axis;a first electrical load mounted to said first shaft and electrically connected to receive electrical current from said first winding;a second shaft; anda first field array mounted on said second shaft, adjacent to said first winding, said first field array including first and second flat circular Halbach arrays with mutually-opposing working surfaces facing said first winding, N poles on the working surface of the first flat circular Halbach array being aligned with S poles on the working surface of the second flat circular Halbach array to form shielded magnetic dipoles between the working surfaces of said field array,wherein said first shaft and said second shaft are operatively connected for contra-rotation of said second shaft relative to said first shaft, so that rotation of said first field array relative to said first winding induces an electrical current in said first winding to power said first electrical load. 2. The apparatus of claim 1, wherein said first field array is a permanent magnet field array. 3. The apparatus of claim 1, wherein said first field array includes magnetically soft material for flux guidance. 4. The apparatus of claim 1, further comprising: a second winding mounted to said second shaft and extending toward said first shaft; a second field array mounted to said first shaft and extending toward said second winding; and a second electrical load mounted to said second shaft and electrically connected to receive electrical current from said second winding. 5. The apparatus of claim 1, wherein said first winding and said first field array are disposed in a liquid-cooled volume adjacent to said first and second shafts. 6. An electrical power generation apparatus embedded in a contra-rotating propulsion system including overlapping first and second shafts operatively connected for counter-rotation about a common axis, the apparatus comprising: a first winding mounted to one of said first and second shafts;a first electrical load mounted to the one of said first and second shafts and electrically connected to receive electrical current from said first winding; anda first field array mounted on the other of said first and second shafts adjacent to said first winding, wherein relative rotation of said first winding and said first field array induces electrical current in said first winding to power said first electrical load,wherein said first field array includes first and second circular Halbach arrays with mutually-opposing working surfaces facing said winding, N poles on the working surface of the first circular Halbach array being aligned with S poles on the working surface of the second circular Halbach array to form shielded magnetic dipoles between the working surfaces of said field array. 7. The apparatus of claim 6, wherein said first field array includes magnetically soft material for flux guidance. 8. The apparatus of claim 6, wherein said first field array is a permanent magnet field array. 9. The apparatus of claim 6, wherein said first and second shafts overlap radially, said first winding extends from the one of said first and second shafts toward the other of said first and second shafts, and said first field array includes first and second flat circular Halbach arrays that extend from the other of said first and second shafts toward the one of said first and second shafts so as to bracket said winding. 10. The apparatus of claim 6, wherein said first winding and said first field array are air-cooled. 11. A contra-rotating open rotor aircraft propulsion system including first and second overlapping shafts operatively connected for counter-rotation about a common axis, said first and second shafts including respective first and second rotor blade sets protruding therefrom, the propulsion system further including a de-icing apparatus, the de-icing apparatus comprising: a first de-icing element mounted to one of said first rotor blade set and said second rotor blade set;a first winding mounted on the one of said first shaft and said second shaft including the one of said first rotor blade set and said second rotor blade set, and electrically connected to provide an electrical current to said first de-icing element;a first field array mounted adjacent to said first winding on the other of said first shaft and said second shaft, wherein relative rotation of said first winding and said first field array induces an electrical current in said first winding to power said first de-icing element, thereby de-icing the one of said first rotor blade set and said second rotor blade set;a second de-icing element connected to the other of said first rotor blade set and said second rotor blade set;a second winding mounted on the other of said first shaft and said second shaft, and electrically connected to provide an electrical current across said second de-icing element; anda second field array mounted on the one of said first shaft and said second shaft adjacent to said second winding, wherein relative rotation of said second winding and said second field array induces an electrical current in said second winding to power said second de-icing element, thereby de-icing said second rotor blade set. 12. The system of claim 11, further comprising: a first power control unit electrically connected between said first winding and said first de-icing element to modify said electrical current. 13. The system of claim 11, further comprising: a first power control unit electrically connected between said first winding and said first de-icing element to modify said electrical current; and a second power control unit electrically connected between said second winding and said second de-icing element to modify said electrical current. 14. The system of claim 13, wherein said first field array includes first and second flat circular Halbach arrays with mutually-opposing working surfaces facing said first winding, N poles on the working surface of the first circular Halbach array being aligned with S poles on the working surface of the second circular Halbach array to form shielded magnetic dipoles between the working surfaces of said field array through the coils of said first winding, said second field array includes third and fourth flat circular Halbach arrays with mutually-opposing working surfaces facing said second winding, N poles on the working surface of the third circular Halbach array being aligned with S poles on the working surface of the fourth circular Halbach array to form shielded magnetic dipoles between the working surfaces of said field array through the coils of said second winding, and said first field array, said first winding, said second field array, and said second winding are disposed in an oil-free volume and are air-cooled.