Rotary electric machine

A brushless field winding type rotary electrical machine disposed between an engine and a transmission along a rotational axis and positioned between a case housing a starting apparatus and the starting apparatus, comprising:

• a stator held by the case, the stator including therein an AC coil that generates a rotating magnetic field with an alternating current;
• a field core held by the case, the field core including therein a field coil that is excited by a direct current;
• and
• a rotor disposed on an outer circumference of the starting apparatus and held rotatably about the rotational axis relative to the stator and the field coil, wherein
• a first air gap is formed between the stator and the rotor, the first air gap configured to allow a magnetic flux to flow between the stator and the rotor,
• a second air gap is formed between the field core and the rotor, the second air gap configured to allow a magnetic flux to flow between the field core and the rotor, the second air gap configured to define an interval extending along a direction that intersects an axial direction of the rotational axis on one end surface of the rotor in the axial direction of the rotational axis
• the rotor includes
• a first magnetic pole having a plurality of claw portions protruding from a first annular portion in the axial direction of the rotational axis,
• a second magnetic pole having a plurality of protrusions that protrude in a radial direction and are arranged on an outer circumferential surface of a second annular portion at circumferential intervals in a circumferential direction thereof, the second annular portion disposed inside the first annular portion with a radial interval interposed between the second annular portion and the first annular portion and partially overlapping the first annular portion, and
• a magnetic pole holding member with an annular shape having a fitting portion where the claw portions of the first magnetic pole and the protrusions of the second magnetic pole are fixedly fitted to each other,
• each of the claw portions of the first magnetic pole is inserted into the interval between the protrusions of the second magnetic pole to alternately arrange the claw portion of the first magnetic pole and the protrusion of the second magnetic pole in the circumferential direction, and
• the first magnetic pole and the second magnetic pole are fixedly fitted to the magnetic pole holding member without contacting each other.