Patent ID: 8063527

Claim:
A gas turbine assembly comprising; a fan, a compressor, a high pressure turbine and a low pressure turbine in serial flow communication, and an electrical machine arranged coaxially; the electrical machine comprising: a fixed stator element, a first rotor element and a second rotor element, the first and second rotor elements independently rotatable with respect to the stator element; the first rotor element mechanically connected with a shaft of the high pressure turbine, and the second rotor element being connected with a shaft of the low pressure turbine; the stator element having inner and outer multiple-phase winding sets wound thereon, each of the winding sets configured to generate separate power outputs or to receive a separate excitation power source, the inner and outer winding sets being mutually exclusive; wherein each of the first and second rotor elements are configured to generate electrical power through electromagnetic coupling with the stator element when driven by the associated high or low pressure turbine shaft, or to electrically drive the associated high or low pressure turbine shaft when excited by an external electrical power source.