Rotor core of rotating electrical machine

Abstract

Provided is a rotor core of a rotary electric machine, which is capable of suppressing transmission of tensile stress caused by centrifugal force to a shaft holding part and suppressing transmission of compressive stress caused by a fastening load of a rotor shaft to an electromagnetic part without disposing two ribs in the radial direction. A rotor core (10) of a rotary electric machine is provided with a rotor shaft hole (11), a shaft holding part (13), an electromagnetic part (17), and a plurality of ribs (20) connecting the shaft holding part and the electromagnetic part. The rib is provided with a first end surface (21) and a second end surface (22) that form both end surfaces in the circumferential direction. A lightening hole (40) is arranged between the first end face and the second end face of the rib. The first end surface and the second end surface of the rib have: concave curved sections (213, 223) that extend in the radial direction from the outer end sections (212, 222);and convex curved sections (214, 224) that extend in the radial direction continuously with the concave curved sections (213, 223).

Description

technical field [0001] The present invention relates to a rotor core constituting a rotor of a rotating electric machine. Background technique [0002] Conventionally, as a rotor used in a rotating electrical machine, there is known a rotor comprising: a substantially annular rotor core on which a rotor shaft is fastened on an inner peripheral surface; and a plurality of permanent magnets on which the rotor core The outer peripheral parts are arranged at predetermined intervals in the circumferential direction. [0003] In the rotor core of such a rotating electrical machine, the outer peripheral surface of the rotor core is deformed radially outward due to the tightening load of the rotor shaft, and the output performance of the rotating electrical machine is degraded. In addition, due to the centrifugal force generated in the rotor core and permanent magnets due to the rotation of the rotor of the rotating electric machine, the inner peripheral surface of the rotor core m...

AI Technical Summary

Problems solved by technology

[0008] However, since the rotor core of the rotating electric machine in Patent Document 1 has inner and outer peripheral ribs, it is necessary to arrange the two ribs in the radial direction, so it is difficult to reduce the size of the rotor core, and it is also difficult to increase the inner circumference of the rotor core. face diameter

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