Stator of a rotating electrical machine

Abstract

In the structure in which the laminated iron core (1) is embedded and fixed in the frame (3), the frame (3) has a portion composed of only the frame cylindrical portion (3a) having a predetermined thickness in the axial direction and includes In the case of the frame high rigidity part (30) of the frame extension part (3b) in which the outer peripheral part of the frame cylindrical part (3a) protrudes outward, the frame cylindrical part fixed in the laminated iron core (1) On the inner diameter side of (3a), the second iron core (12) provided with riveting parts (2a) arranged on the entire length of the laminated iron core (1) is fixed on the inner diameter side of the high rigidity part (30) of the frame The first iron core (11) is not only provided with the riveting part (2a) but also additionally provided with the riveting part (2b), and the number of riveting parts is increased only in necessary parts.

Description

technical field [0001] This application relates to stators for rotating electric machines. Background technique [0002] Against the background of global warming, in order to reduce carbon dioxide emissions of automobiles, it is required to improve fuel efficiency, or to promote electrification of automobiles equipped with motors. [0003] Furthermore, in order to improve fuel efficiency, higher output of motors is required. Generally, a laminated core made of laminated steel plates is used for a stator of a motor, and riveting is provided on the laminated core in order to fix the laminated steel plates to each other. [0004] In addition, as a prior art, there is disclosed a technique in which, for a laminated iron core embedded in a frame having the same cross-sectional shape continuous in the axial direction, riveting members are provided at both ends in the axial direction of the laminated iron core. The stacked iron cores are fixed in the axial direction by a rivet (f...

AI Technical Summary

Problems solved by technology

[0007] When the iron core deforms out of plane, the magnetic flux that should have interlinked at the deformed portion flows to the surrounding iron core, which increases the magnetic flux density of the iron core around the deformed portion, resulting in a decrease in motor efficiency

In addition, when the iron core is plastically deformed due to out-of-plane deformation, the iron loss will deteriorate

[0008] In addition, the rivets are set so as to plastically deform the iron core, so if the number of rivets increases, the iron loss will worsen, resulting in a decrease in motor efficiency

[0009] In the example of Patent Document 1, when the shape of the frame maintains the same cross-sectional shape in the axial direction, and the stress on the laminated iron core embedded in the inner diameter side of the frame is uniform in the axial direction, by limiting the The two axial ends of the core are provided with riveting parts to suppress the out-of-plane deformation of the core, but the shape of the frame is not formed to maintain the same cross-sectional shape in the axial direction, and the stress on the laminated core is in the axial direction. Depending on the shape of the frame, simply providing rivets at both ends of the laminated core in the axial direction is not suitable for suppressing out-of-plane deformation of the core.

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