Electric generator system

An aircraft comprising:

• an airframe;
• an engine on-board the airframe, the engine comprising a rotatable shaft that is configured to rotate about a central longitudinal axis of the shaft;
• and
• an electric generator system on-board the airframe, the electric generator system comprising:
• a pilot permanent magnet generator (PMG) mounted to the shaft of the engine such that the pilot PMG is configured to rotate about the central longitudinal axis with the shaft;
• and
• a wound field flux-switching electric machine comprising a rotor and a stator, the rotor being mounted to the shaft of the engine such that the rotor is configured to rotate about the central longitudinal axis with the shaft, the stator comprising both a direct current (DC) field coil and an alternating current (AC) armature coil, the DC field coil being operatively connected to the pilot PMG for exciting the DC field coil.

An electric generator system comprising:

• a rotatable shaft that is configured to rotate about a central longitudinal axis of the shaft;
• a direct current (DC) source;
• and
• a wound field flux-switching electric machine comprising a rotor and a stator, the rotor being mounted to the shaft such that the rotor is configured to rotate about the central longitudinal axis with the shaft, the stator comprising both a DC field coil and an alternating current (AC) armature coil, the DC field coil being operatively connected to the DC source for exciting the DC field coil.