stator of a rotating electric machine

By adjusting the number of rivets in the laminated iron core according to different axial areas of the frame shape, the problem of out-of-plane deformation and iron loss caused by uneven stress in the iron core is solved, and the efficiency and stability of the motor are improved.

CN111585364B9Active Publication Date: 2022-04-05MITSUBISHI ELECTRIC CORP
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Patent Information

Application Number
CN202010066934.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2019-02-18
Filing Date
2020-01-20
Publication Date
2022-04-05
Estimated Expiration
2040-01-20

AI Technical Summary

Technical Problem

In the prior art, in a stator with a laminated iron core, as the shape of the frame changes along the axial direction, the iron core is subject to uneven stress, resulting in out-of-plane deformation and deterioration of iron loss, thereby reducing motor efficiency.

Method used

By arranging different numbers of rivets in different areas along the axial direction according to the shape of the frame in the laminated core, the number of rivets is increased in areas with high stress and reduced in areas with low stress to suppress the plastic deformation and deformation of the core. Iron loss.

Benefits of technology

It effectively suppresses the out-of-plane deformation and iron loss of the iron core and improves the efficiency and stability of the motor.

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Abstract

In a structure in which the stacked iron core (1) is embedded and fixed to the frame (3), when the frame (3) has a portion consisting only of a frame cylindrical portion (3a) having a predetermined thickness in the axial direction and a frame high rigidity portion (30) including a frame extension portion (3b) extending outward from the outer periphery of the frame cylindrical portion (3a), for the second iron core (12) fixed in the stacked iron core (1), on the inner diameter side of the frame cylindrical portion (3a) and provided with a rivet (2a) disposed along the entire length of the stacked iron core (1), the first iron core (11) fixed on the inner diameter side of the frame high rigidity portion (30) is not only provided with the rivet (2a) but also additionally provided with a rivet (2b), and the number of rivets is increased only where necessary.
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