A rotor for a rotary electric machine, comprising:
- a rotor core having a substantially annular shape in which a plurality of magnetic pole portions is provided at predetermined intervals in a circumferential direction, wherein
- each of the magnetic pole portions includes:
- at least one magnet insertion hole that penetrates the rotor core in an axial direction,
- a permanent magnet that is inserted into the magnet insertion hole,
- a central axis referred to as a d-axis, and
- an axis referred to as a q-axis that is separated from the d-axis by an electric angle of 90 degrees,
- when viewed from the axial direction, the magnet insertion hole
- is formed on a side of the magnetic pole portion in the circumferential direction relative to the d-axis,
- extends in the circumferential direction as going radially outward from the d-axis to the q-axis,
- and includes:
- an outer-diameter-side wall surface extending in the circumferential direction;
- an inner-diameter-side wall surface extending in the circumferential direction so as to face the outer-diameter-side wall surface from a radially inner side;
- a d-axis-side end portion connecting the outer-diameter-side wall surface and the inner-diameter-side wall surface at an end portion on the d-axis side in the circumferential direction;
- and a q-axis-side end portion connecting the outer-diameter-side wall surface and the inner-diameter-side wall surface at an end portion on the q-axis side in the circumferential direction,
- the permanent magnet includes:
- an outer-diameter-side end surface facing the outer-diameter-side wall surface of the magnet insertion hole and extending in the circumferential direction inside the magnet insertion hole;
- an inner-diameter-side end surface facing the inner-diameter-side wall surface of the magnet insertion hole and extending in the circumferential direction inside the magnet insertion hole;
- a d-axis-side end portion connecting the outer-diameter-side end surface and the inner-diameter-side end surface at an end portion on the d-axis side in the circumferential direction;
- and a q-axis-side end portion connecting the outer-diameter-side end surface and the inner-diameter-side end surface at an end portion on the q-axis side in the circumferential direction,
- a d-axis-side space portion penetrating in the axial direction is provided inside the magnet insertion hole between the d-axis-side end portion of the permanent magnet and the d-axis-side end portion of the magnet insertion hole,
- a q-axis-side space portion penetrating in the axial direction is provided inside the magnet insertion hole between the q-axis-side end portion of the permanent magnet and the q-axis-side end portion of the magnet insertion hole,
- the permanent magnet further includes:
- a first communication portion provided at a predetermined distance from a first end portion on one side in the axial direction toward a center in the axial direction, the first communication portion being configured to communicate the d-axis-side end portion with the q-axis-side end portion;
- and a second communication portion provided at a predetermined distance from a second end portion on the other side in the axial direction toward the center in the axial direction, the second communication portion being configured to communicate the d-axis-side end portion with the q-axis-side end portion,
- the d-axis-side space portion includes:
- a first opening portion opened in a first end surface on the one side in the axial direction of the rotor core, and a second opening portion opened in a second end surface on the other side in the axial direction of the rotor core, and
- a coolant is introduced from the first opening portion of the d-axis-side space portion into the d-axis-side space portion, at least a part of the coolant is supplied to the q-axis-side space portion through the first communication portion to flow to the other side in the axial direction, supplied again to the d-axis-side space portion through the second communication portion, and discharged from the second opening portion of the d-axis-side space portion.