Mechanical fixed magnetic steel structure, rotor assembly and motor

By adopting a circular core section design and a clearance structure and fin structure in the motor, the problem of insulation layer scratching during magnet insertion is solved, thus achieving efficient operation and performance improvement of the motor.

CN119276034APending Publication Date: 2025-01-07HEFEI JUYI POWER SYST CO LTD
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Patent Information

Application Number
CN202411221986.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-02
Publication Date
2025-01-07

AI Technical Summary

Technical Problem

Existing mechanically fixed magnet structures are prone to scratching the insulation layer during the insertion process, leading to increased eddy current losses in the motor, higher magnet temperature, and reduced efficiency.

Method used

The design adopts a circular iron core section, with a void-avoiding structure and fin structure. The cross-sectional area of ​​the deformable part of the fin is smaller than that of the contact part. The deformation part reduces the contact pressure and avoids direct contact between the magnet and the inner wall of the channel, ensuring tight connection and integrity of the insulation layer.

Benefits of technology

This reduces scratching on the magnet surface, lowers eddy current losses, increases the motor's output torque and power, and improves the motor's operating efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention belongs to the field of motors, and particularly relates to a mechanical fixed magnetic steel structure. Comprising a plurality of iron core sections, each iron core section is in a circular ring shape, a plurality of groups of magnetic steel grooves are formed in the ring surface in the circumferential direction, the iron core sections are coaxially stacked, notches of the corresponding magnetic steel grooves are oppositely combined to form a channel for magnetic steel to be inserted, and the length direction of the channel is parallel to the axial direction of the iron core sections; the inner wall of each channel is concaved inwards to form a receding structure, the receding structure of at least one channel is provided with a sheet-shaped fin in a protruding mode, each fin comprises a deformation part integrally formed with the corresponding receding structure, and the deformation parts extend in the direction away from the receding structures, so that the cantilever ends of the fins abut against the magnetic steel to form contact parts. And the sectional area of the deformation part is smaller than that of the contact part, so that the magnetic steel is matched with the channel in an inserting manner, the deformation part deforms, the contact pressure between the contact part and the magnetic steel is reduced, scraping to the surface of the magnetic steel is reduced, an insulating layer on the magnetic steel is prevented from being damaged, and the influence degree of the insulating property is reduced.
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Claims

1. A mechanically fixed magnetic steel structure, characterized in that: The invention comprises a plurality of core segments (1), wherein the core segments (1) are in an annular shape, and a plurality of groups of magnetic steel grooves (11) are arranged on the annular surface along the circumferential direction. The plurality of core segments (1) are coaxially stacked so that the notches of the corresponding magnetic steel grooves (11) are aligned to form a channel for inserting the magnetic steel (2), and the length direction of the channel is parallel to the axial direction of the core segment (1); The inner wall of the channel is concave to form a void avoidance structure (12); a sheet-shaped fin (13) is protruded from the void avoidance structure (12) of at least one channel; the fin (13) comprises a deformation portion (130) integrally formed with the void avoidance structure (12); the deformation portion (130) extends in a direction away from the void avoidance structure (12), so that the cantilever end of the fin (13) contacts the magnetic steel (2) to form a contact portion (131); and the cross-sectional area of ​​the deformation portion (130) is smaller than the cross-sectional area of ​​the contact portion (131), so that the magnetic steel (2) and the channel are plugged together, and the deformation of the deformation portion (130) reduces the contact pressure between the contact portion (131) and the magnetic steel (2).

2. A mechanically fixed magnetic steel structure according to claim 1, characterized in that: The deformation portion (130) and the contact portion (131) are connected to each other to form a T-shaped or inverted L-shaped sheet structure.

3. A mechanically fixed magnetic steel structure according to claim 1, characterized in that: A slot or a hole is provided on the deformation portion (130), so that the cross-sectional area of ​​the deformation portion (130) is smaller than the cross-sectional area of ​​the contact portion (131).

4. A mechanically fixed magnetic steel structure according to claim 1, characterized in that: The magnetic steel slots (11) are inclined slots, and a group of magnetic steel slots (11) are symmetrical to each other along the axis of the core segment (1) to form a ∧ shape.

5. A mechanically fixed magnetic steel structure according to claim 4, characterized in that: A clearance groove (120) is provided in the inner wall of a group of magnetic steel grooves (11) that are far away from each other. The cross section of the clearance groove (120) is W-shaped, and the top is cut flat to form the clearance structure (12).

6. A mechanically fixed magnetic steel structure according to claim 1, characterized in that: The outer contour of the magnetic steel (2) is adapted to the channel, and a conductive layer and an insulating layer are attached to the plug-in mating surface with the channel.

7. A mechanically fixed magnetic steel structure according to claim 1, characterized in that: The fins (13) are arranged at intervals in a plurality of channels.

8. The mechanically fixed magnetic steel structure according to claim 5, characterized in that: The corners of the air avoidance groove (120) are all provided with arc chamfers, and the corners of the fin (13) are also provided with arc chamfers.

9. A rotor assembly, using the mechanically fixed magnetic steel structure according to any one of claims 1 to 8, characterized in that: It comprises a rotating shaft (3), on which a plurality of core segments (1) are connected axially via a mechanically fixed magnetic steel structure to form a motor rotor assembly.

10. A motor, using a rotor assembly according to claim 9, characterized in that: The motor uses a motor rotor assembly to output torque.