Rotor for rotary electric machine

Abstract

A rotor for a rotary electric machine is provided and can avoid a situation that excessive stress is generated on the circumferential center portion of an outer-circumference-side inner surface of a magnet insertion hole during rotor rotation. The rotor (10) includes: a rotor core (20) which includes a magnet insertion hole (40); and a permanent magnet (30) housed in the magnet insertion hole. Thepermanent magnet has an arc shape which is convex toward an axial line. The rotor core includes: an outer-circumference core part (21); an inner-circumference core part (22); and connection ribs (23a, 23b) which 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 abut on aninner 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, 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.

Description

technical field [0001] The present invention relates to a rotor mounted in a rotating electrical machine such as an electric vehicle. Background technique [0002] Conventionally, there is known a so-called IPM motor in which a plurality of permanent magnets are arranged at predetermined intervals in a circumferential direction inside a rotor core as a rotor used in a rotating electric machine. In such an IPM motor, arc-shaped permanent magnets are arranged so as to protrude toward the axis of rotation. As methods for fixing the arc-shaped permanent magnets to the rotor core, for example, patent documents 1 and 2 are known. documented technology. [0003] Patent Document 1 discloses a structure in which holes for riveting are provided on the outer peripheral side of the rotor, and the rotor core is deformed by pressing while riveting the rotor core with rivet pins, whereby the rotor core and the arc-shaped permanent magnet pass through the surface. contact for fixation. ...

AI Technical Summary

Problems solved by technology

Therefore, if there is a manufacturing error on the permanent magnet, when the rotor rotates at high speed, due to the centrifugal force of the permanent magnet, excessive stress will be generated in the circumferential center of the inner surface of the outer peripheral side of the magnet insertion hole, and the connecting rib of the rotor core may be damaged. will be deformed

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