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CN-224218166-U - Motor rotor and die

CN224218166UCN 224218166 UCN224218166 UCN 224218166UCN-224218166-U

Abstract

A motor rotor comprises an iron core, a permanent magnet assembly, a plurality of radial magnetizing permanent magnets and an elastic support piece, wherein the permanent magnet assembly comprises a plurality of circumferential magnetizing permanent magnets and a plurality of radial magnetizing permanent magnets, the circumferential magnetizing permanent magnets generate a magnetic field in the approximately circumferential direction, the radial magnetizing permanent magnets generate a magnetic field in the approximately radial direction, the radial magnetizing permanent magnets and the plurality of circumferential magnetizing permanent magnets are alternately arranged on the radial periphery of the iron core, the radial periphery of the iron core is provided with a plurality of grooves, the grooves are inwards concave in the radial direction, the circumferential magnetizing permanent magnets are partially assembled in the corresponding grooves, and the elastic support piece is arranged in the grooves and is configured to support the radial inner wall of the circumferential magnetizing permanent magnets.

Inventors

  • LI YUEBIN
  • Yao Dingchao
  • MAO LIJUN

Assignees

  • 浙江智源智控科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250422

Claims (16)

  1. 1. An electric motor rotor, comprising: an iron core; a permanent magnet assembly including a plurality of circumferential magnetization permanent magnets that generate a magnetic field in a substantially circumferential direction and a plurality of radial magnetization permanent magnets that generate a magnetic field in a substantially radial direction, the plurality of radial magnetization permanent magnets and the plurality of circumferential magnetization permanent magnets being alternately arranged at a radial outer circumference of the iron core; Wherein, the radial periphery of the iron core is provided with a plurality of grooves, the grooves are inwards recessed along the radial direction, and the circumferential magnetizing permanent magnets are partially assembled in the corresponding grooves; And wherein an elastic support is provided in the groove, the elastic support being configured to support a radially inner wall of the circumferentially magnetized permanent magnet.
  2. 2. The motor rotor of claim 1, wherein adjacent circumferentially-oriented and radially-oriented permanent magnets are in contact with each other.
  3. 3. The electric machine rotor of claim 2, further comprising an injection molded body filled within the electric machine rotor to secure the permanent magnet assembly and the core together.
  4. 4. A motor rotor according to claim 3, characterized in that the radially inner side of the elastic support forms an injection hole, a part of the injection body being filled in the injection hole.
  5. 5. The motor rotor of claim 4, wherein the resilient support comprises two supports symmetrically disposed about the recess, the two supports defining a gap therebetween.
  6. 6. The motor rotor of claim 5, wherein the injection molded body in the injection molded hole is in contact with a radially inner wall of the circumferentially magnetized permanent magnet via the notch.
  7. 7. The electric machine rotor according to claim 5, characterized in that the support body comprises a support end portion and a support root portion, the support end portion being located circumferentially inside the groove with respect to the support root portion, the gap being formed between two support end portions, the support end portions being configured to support a radially inner wall of the circumferentially magnetized permanent magnet during assembly of the electric machine rotor, the support root portion being connected to a circumferential side wall of the groove.
  8. 8. The motor rotor of claim 1, wherein the core is provided with a plurality of protrusions, the protrusions are located at both sides of the corresponding grooves, and two protrusions between adjacent grooves form an assembly space of the radial magnetizing permanent magnet.
  9. 9. The electric machine rotor of claim 1, wherein the outer diameter of the circumferentially-charged permanent magnets is smaller than the outer diameter of the radially-charged permanent magnets.
  10. 10. The motor rotor of claim 1, wherein a radially outer portion of the circumferentially-charged permanent magnet forms a detent.
  11. 11. The electric machine rotor of claim 10, wherein the length of the detent groove in the radial direction is between 0.45mm and 0.55 mm.
  12. 12. The electric machine rotor of claim 1, wherein the outer circumferential length of the circumferentially magnetized permanent magnets is between 5.5mm and 10.5 mm.
  13. 13. The electric machine rotor of claim 7, wherein the circumferential length of the gap is greater than the length of the support root.
  14. 14. The electric machine rotor of claim 7, wherein the radial width of the support ends is less than the radial width of the support roots.
  15. 15. A mold for manufacturing the motor rotor according to any one of claims 1 to 14, characterized in that the mold has a receiving space for receiving the motor rotor; The die is provided with a plurality of bosses, the bosses protrude inwards along the radial direction, and the circumferential magnetizing permanent magnet is located between the corresponding bosses and the grooves.
  16. 16. The mold of claim 15, wherein the boss mates with the detent.

Description

Motor rotor and die Technical Field The present utility model relates to a motor rotor and a mold, and more particularly, to a motor rotor and a corresponding mold that are more convenient to assemble. Background During assembly of the motor rotor, the permanent magnet assembly is first arranged at the radial outer periphery of the iron core and placed in a mold, and then injection molding material is injected into the injection molding holes to fix the rotor assembly and the iron core together. However, the permanent magnet may have tolerance during processing, resulting in uneven length of the permanent magnet, so that the permanent magnet with too large length cannot be put into the mold, and the permanent magnet with too small length may form a larger gap to reduce the performance of the electrode rotor. For this reason, it is desirable to propose a motor rotor that ameliorates the drawbacks of the prior art described above. Disclosure of utility model According to a first aspect of the utility model, an electric motor rotor is provided, comprising an iron core, a permanent magnet assembly comprising a plurality of circumferential magnetizing permanent magnets and a plurality of radial magnetizing permanent magnets, the circumferential magnetizing permanent magnets generating a magnetic field in a substantially circumferential direction, the radial magnetizing permanent magnets generating a magnetic field in a substantially radial direction, the plurality of radial magnetizing permanent magnets and the plurality of circumferential magnetizing permanent magnets being alternately arranged at a radial outer periphery of the iron core, wherein the radial outer periphery of the iron core is provided with a plurality of grooves, the grooves being recessed inwards in the radial direction, the circumferential magnetizing permanent magnets being partially fitted in the respective grooves, and wherein elastic supports are provided within the grooves, the elastic supports being configured to support a radial inner wall of the circumferential magnetizing permanent magnets. According to this solution, by providing recesses on the core, the positioning of the permanent magnets during assembly of the motor rotor is facilitated. In addition, through setting up the elastic support piece in the recess for during the assembly permanent magnet, the elastic support piece is all the time against the permanent magnet, thereby has avoided the permanent magnet length inhomogeneous and has led to assembly difficulty or performance decline. In some aspects, adjacent circumferentially-oriented permanent magnets may be in contact with the radially-oriented permanent magnets. In some aspects, the motor rotor may further include an injection molded body that fills the motor rotor to secure the permanent magnet assembly and the core together. In some aspects, the radially inner side of the resilient support may form an injection hole in which a portion of the injection body fills. In some aspects, the elastic support may include two supports symmetrically disposed about the groove, with a gap formed therebetween. In some aspects, the injection molding body in the injection molding hole may contact the radially inner wall of the circumferentially magnetized permanent magnet via the notch. According to the scheme, after the injection molding body fills the injection molding hole, the radial inner wall of the circumferential magnetizing permanent magnet can be closely contacted, so that the radial positioning strength and the connecting strength of the permanent magnet are increased. In some aspects, the support body may include a support end portion and a support root portion, the support end portion being located circumferentially inward of the groove relative to the support root portion, the gap being formed between the two support end portions, the support end portion being configured to support a radially inner wall of the circumferentially magnetized permanent magnet during assembly of the motor rotor, the support root portion being connected to a circumferential side wall of the groove. According to this scheme, during the assembly of permanent magnet, the support tip of elastic support piece is all the time against the permanent magnet to avoid the permanent magnet length inhomogeneous and lead to assembly difficulty or performance degradation. In some schemes, a plurality of protrusions can be arranged on the iron core, the protrusions are positioned on two sides of the corresponding grooves, and two protrusions between adjacent grooves form an assembly space of the radial magnetizing permanent magnet. In some aspects, the outer diameter of the circumferentially-charged permanent magnet may be less than the outer diameter of the radially-charged permanent magnet. In some aspects, the radially outer portion of the circumferentially magnetized permanent magnet may form a detent. In some aspects, the length of the detents in the ra