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Manufacturing method and clamping tool of a combined magnet with low eddy current heating

An eddy current heating and clamping tooling technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as easy generation of air bubbles, affecting the bonding and residual of magnet components, and achieve improved bonding force and simple structure. , reduce the effect of bubble generation

Active Publication Date: 2022-07-15
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above method, when coating and curing, the glue will remain on the surface of the magnet, which needs to be processed. In addition, the magnet components are easily bonded to produce air bubbles, which will affect the bonding between the magnet components.

Method used

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  • Manufacturing method and clamping tool of a combined magnet with low eddy current heating
  • Manufacturing method and clamping tool of a combined magnet with low eddy current heating
  • Manufacturing method and clamping tool of a combined magnet with low eddy current heating

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Ten-ten combined magnets (ie, combined magnets consist of ten magnet assemblies) were fabricated by electrophoretic coating. The magnet components used are all NdFeB magnets, such as commercially available N42 NdFeB magnets. In this embodiment, the thickness of each magnet assembly is the same, and the size is 26mm×20mm×15mm (the 15mm direction is the orientation direction).

[0043] The fabrication of combined magnets mainly includes four steps, namely magnet assembly pretreatment, electrophoretic coating, lamination and baking.

[0044] The magnet assembly pretreatment includes four steps: degreasing, rust removal, activation and phosphating:

[0045] 1) Degreasing: degreasing in a degreasing tank at 70°C for 5min-10min, followed by ultrasonic cleaning and deionized water cleaning;

[0046] 2) Derusting: After dipping the degreasing NdFeB sample in 4% nitric acid solution for 30s-60s, ultrasonic cleaning and deionized water cleaning were performed;

[0047] 3) Acti...

Embodiment 2

[0065] Ten-ten combined magnets (ie, combined magnets consist of ten magnet assemblies) were fabricated by electrophoretic coating. The magnets used are all NdFeB magnets, such as commercially available N42 NdFeB magnets. The size of each magnet assembly is 26mm×20mm×15mm (the 15mm direction is the orientation direction). The production process is as follows figure 1 shown.

[0066] The fabrication of combined magnets mainly includes four steps, namely magnet assembly pretreatment, electrophoretic coating, lamination and baking.

[0067] The magnet assembly pretreatment includes four steps: degreasing, rust removal, activation and phosphating:

[0068] 1) Degreasing: degreasing in a degreasing tank at 70°C for 5min-10min, followed by ultrasonic cleaning and deionized water cleaning;

[0069] 2) Derusting: After dipping the degreasing NdFeB magnet assembly in 4% nitric acid solution for 30s-60s, ultrasonic cleaning and deionized water cleaning are performed;

[0070] 3) Acti...

Embodiment 3

[0086] Ten-ten combined magnets (ie, combined magnets consisting of ten magnet assemblies) were fabricated by electrophoretic coating. The magnets used are all NdFeB magnets. Commercially available N42 and N48 NdFeB magnets are used. The size of each magnet assembly is 26mm×20mm×15mm (the 15mm direction is the orientation direction).

[0087] The fabrication of combined magnets mainly includes four steps, namely magnet assembly pretreatment, electrophoretic coating, lamination and baking.

[0088] The magnet assembly pretreatment includes four steps: degreasing, rust removal, activation and phosphating:

[0089] 1) Degreasing: Degrease in a degreasing tank at 70°C for 5min-10min, and then perform ultrasonic cleaning and deionized water cleaning;

[0090] 2) Derusting: After dipping the degreasing NdFeB sample in 4% nitric acid solution for 30s-60s, ultrasonic cleaning and deionized water cleaning were performed;

[0091] 3) Activation: The rust-removed NdFeB magnet assembly ...

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Abstract

The invention discloses a manufacturing method and a clamping tool for a combined magnet with low eddy current heating. The method comprises the following steps: pretreatment of a magnet assembly; forming an incompletely cured thermosetting resin on at least one surface of the pretreated magnet assembly The magnet assemblies are stacked with a clamping tool, the incompletely cured thermosetting resin layer is formed on the stacked surface of the magnet assemblies, and the stacked magnet assemblies are pressed, and the pressing force is 0.01MPa-2.5MPa; the stacked magnet assemblies together with the clamping tool are baked and solidified in an oven, the baking temperature is 150°C-200°C, and the baking time is 10min-24h; the combined magnet is obtained after cooling. The invention also discloses a clamping tool used for the preparation of the combined magnet with low eddy current heating. In the present invention, a resin layer is formed on the surface of the magnet assembly, which is heated and cured after stacking, and there is no need for additional processing of excess glue.

Description

technical field [0001] The invention relates to a manufacturing method and a clamping tool for a combined magnet with low eddy current heating. Background technique [0002] Magnets, especially permanent magnets, are widely used in generators, motors and other fields. In order to reduce the eddy current heating and improve the performance of the permanent magnet motor, it is necessary to combine the magnets. In the existing manufacturing method of low eddy current heating magnets, the magnet components are usually bonded by adhesive, and liquid resin adhesive is generally used, such as: [0003] CN103021610A discloses a composite permanent magnet magnetic material. The material is formed by splicing more than one permanent magnetic material, and the permanent magnetic material is an adhesive. The permanent magnet magnetic material is activated before bonding: (1) electrophoresis of each permanent magnet magnetic material respectively; (2) immersion of each permanent magne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/0253
Inventor 张炜叶瀚棽施尧童庆坤蓝琴周燕
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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