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CN-224232429-U - Neodymium-iron-boron magnet and motor rotor

CN224232429UCN 224232429 UCN224232429 UCN 224232429UCN-224232429-U

Abstract

The application relates to a neodymium-iron-boron magnet and a motor rotor. The neodymium-iron-boron magnet comprises a neodymium-iron-boron matrix, an anti-corrosion layer, an epoxy resin layer and an epoxy resin layer, wherein the neodymium-iron-boron matrix is coated with the anti-corrosion layer, the surface of the anti-corrosion layer comprises a first surface and a second surface, the first surface and the second surface are perpendicular to the orientation direction of the neodymium-iron-boron matrix, the epoxy resin layer is coated on the first surface and the second surface of the anti-corrosion layer, and the other surfaces of the anti-corrosion layer are not covered by the epoxy resin layer. According to the application, the epoxy resin layer is arranged on part of the surface of the anti-corrosion layer, the epoxy resin layer is not arranged on the other surfaces of the anti-corrosion layer, so that the use amount of epoxy resin in the NdFeB magnet is reduced, and the manufacturing cost of the NdFeB magnet is reduced.

Inventors

  • PAN GUANGHUI
  • CHEN YAJUN
  • FENG ZHIBING
  • HU BINHAO
  • SONG SHUTONG
  • BAI XIAOGANG

Assignees

  • 天津三环乐喜新材料有限公司

Dates

Publication Date
20260512
Application Date
20250408

Claims (9)

  1. 1. A neodymium-iron-boron magnet, comprising: A neodymium iron boron matrix; The surface of the anti-corrosion layer comprises a first surface and a second surface, and the first surface and the second surface are mutually perpendicular to the orientation direction of the neodymium iron boron matrix; And the epoxy resin layer is coated on the first surface and the second surface of the anti-corrosion layer, and the rest surfaces of the anti-corrosion layer are not covered by the epoxy resin layer.
  2. 2. A neodymium-iron-boron magnet according to claim 1, wherein the ratio of the area of the first surface covered by the epoxy resin layer to the area of the first surface is 50% -100%.
  3. 3. A neodymium-iron-boron magnet according to claim 1, wherein the ratio of the area of the second surface covered by the epoxy resin layer to the area of the second surface is 50% -100%.
  4. 4. Neodymium-iron-boron magnet according to claim 1, characterized in that the corrosion protection layer has a surface roughness Ra of 0.5-1.5 μm.
  5. 5. Neodymium-iron-boron magnet according to claim 1, characterized in that the surface roughness Ra of the epoxy resin layer is 1-2.5 μm and the thickness of the epoxy resin layer is 8-150 μm.
  6. 6. A neodymium-iron-boron magnet according to claim 1, wherein the corrosion protection layer comprises a passivation or phosphating layer, which coats the neodymium-iron-boron matrix.
  7. 7. Neodymium-iron-boron magnet according to claim 1, characterized in that the thickness of the corrosion protection layer is 1-4 μm.
  8. 8. A neodymium-iron-boron magnet according to claim 1, wherein the thickness of the neodymium-iron-boron matrix is 1-50mm.
  9. 9. An electric motor rotor, comprising: The rotor body is provided with a magnet groove; The neodymium-iron-boron magnet of any one of claims 1-8, disposed in the magnet slot of the rotor body.

Description

Neodymium-iron-boron magnet and motor rotor Technical Field The application relates to the field of magnet preparation, in particular to a neodymium-iron-boron magnet and a motor rotor. Background Sintered neodymium-iron-boron magnets are widely used due to their excellent magnetic properties. Neodymium iron boron magnets have poor chemical stability, are easy to oxidize under daily use conditions, and are easy to undergo electrochemical oxidation corrosion under damp and hot conditions, so that the neodymium iron boron magnets are required to be coated or coated for surface protection. The existing neodymium-iron-boron magnet is generally coated with an anti-corrosion layer outside a matrix, and is coated with an epoxy resin layer outside the anti-corrosion layer, so that the insulating property of the neodymium-iron-boron magnet can be improved, and the eddy current loss of the neodymium-iron-boron magnet can be reduced. But all surfaces of the neodymium iron boron magnet are provided with epoxy resin layers, and the mass production cost is high. Disclosure of utility model Based on the problems, the application provides a neodymium-iron-boron magnet and a motor rotor, which can reduce the manufacturing cost of the neodymium-iron-boron magnet. An embodiment of the present application provides a neodymium-iron-boron magnet, including: A neodymium iron boron matrix; The surface of the anti-corrosion layer comprises a first surface and a second surface, and the first surface and the second surface are mutually perpendicular to the orientation direction of the neodymium iron boron matrix; And the epoxy resin layer is coated on the first surface and the second surface of the anti-corrosion layer, and the rest surfaces of the anti-corrosion layer are not covered by the epoxy resin layer. According to some embodiments of the application, the ratio of the area of the first surface covered by the epoxy layer to the area of the first surface is 50% -100%. According to some embodiments of the application, the ratio of the area of the second surface covered by the epoxy layer to the area of the second surface is 50% -100%. According to some embodiments of the application, the corrosion protection layer has a surface roughness Ra of 0.5-1.5 μm. According to some embodiments of the application, the surface roughness Ra of the epoxy layer is 1-2.5 μm and the thickness of the epoxy layer is 8-150 μm. According to some embodiments of the application, the corrosion protection layer comprises a passivation or phosphating layer coating the neodymium iron boron matrix. According to some embodiments of the application, the corrosion protection layer has a thickness of 1-4 μm. According to some embodiments of the application, the thickness of the neodymium iron boron matrix is 1-50mm. An embodiment of the present application provides a motor rotor including: The rotor body is provided with a magnet groove; The neodymium iron boron magnet is arranged in the magnet groove of the rotor body. According to the application, the epoxy resin layer is arranged on part of the surface of the anti-corrosion layer, the epoxy resin layer is not arranged on the other surfaces of the anti-corrosion layer, so that the use amount of epoxy resin in the NdFeB magnet is reduced, and the manufacturing cost of the NdFeB magnet is reduced. Drawings In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings by a person skilled in the art without departing from the scope of the present application as claimed. FIG. 1 is a schematic diagram of a neodymium-iron-boron magnet according to an embodiment of the present application; Fig. 2 is a schematic view of a motor rotor according to an embodiment of the present application. Detailed Description The following description of the embodiments of the present application will be made more complete and clear by reference to the accompanying drawings of embodiments of the present application, wherein it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. As shown in fig. 1, one embodiment of the present application provides a neodymium-iron-boron magnet 100, wherein the neodymium-iron-boron magnet 100 includes a neodymium-iron-boron substrate 1, an anti-corrosion layer 2, and an epoxy layer 3. The neodymium iron boron matrix 1 is formed by sintering neodymium iron boron materials. The anticorrosive layer 2 covers all surfaces of the neodymium