Wound-field rotating electric machine

A wound-field rotating electric machine comprising:

• a stator including a stator coil;
• and
• a rotor including a rotor core and a field coil, the rotor core having main pole portions provided respectively for magnetic poles, which are aligned in a circumferential direction, and each protruding in a radial direction, the field coil being wound on the main pole portions of the rotor core,
• wherein:
• the wound-field rotating electric machine is configured to have high-frequency current flowing through the stator coil for inducing field current in the field coil;
• the field coil has a first coil section and a second coil section that are connected in series with each other to form a series connection unit;
• each of the first and second coil sections is wound on all of the main pole portions of the rotor core such that the first coil section is located on a side closer to the stator in the radial direction, whereas the second coil section is located on a side farther from the stator in the radial direction;
• the second coil section has a greater number of turns than the first coil section;
• and
• an electrical conductor wire used for the second coil section has a smaller conductor cross-sectional area than an electrical conductor wire used for the first coil section.