Rotor for rotary electric machine having a gap for alleviating stress during rotation

A rotor for a rotary electric machine, comprising:

• a rotor core which rotates around an axial line and includes a magnet insertion hole extending in parallel to the axial line;
• and
• a permanent magnet which is housed in the magnet insertion hole, wherein
• the permanent magnet has an arc shape which is convex toward the axial line when viewed from a direction of the axial line,
• the rotor core includes:
• an outer-circumference core part which is positioned on an outer-circumference-side of the magnet insertion hole;
• an inner-circumference core part which is positioned on an inner-circumference-side of the magnet insertion hole;
• and
• connection ribs which are positioned in both circumferential ends of the magnet insertion hole and connect the outer-circumference core part and the inner-circumference core part,
• the permanent magnet is supported in the rotor core in such a manner that circumferential ends which are positioned on both circumferential sides of the permanent magnet abut on an inner surface of the magnet insertion hole,
• a circumferential center portion of the permanent magnet is separated from an outer-circumference-side inner surface of the magnet insertion hole,
• in the circumferential center portion of the permanent magnet, a gap is provided between an outer-circumference-side outer surface of the permanent magnet and the outer-circumference-side inner surface of the magnet insertion hole, and
• a whole of circumferential end side lateral surfaces of the permanent magnet do not abut on circumferential lateral inner surfaces of the magnet insertion hole.