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Neodymium-iron-boron bonded magnet, preparation method thereof and motor

A bonded magnet, NdFeB technology, used in magnetic objects, inductance/transformer/magnet manufacturing, circuits, etc., can solve the problem that the strength cannot meet the high-speed use requirements of the motor, and achieve high-speed use and good dispersion uniformity. Effect

Pending Publication Date: 2022-04-29
麦格昆磁(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a NdFeB bonded magnet, its preparation method and motor, to solve the problem that the strength of the NdFeB bonded magnet in the prior art cannot meet the high-speed use requirements of the motor

Method used

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  • Neodymium-iron-boron bonded magnet, preparation method thereof and motor
  • Neodymium-iron-boron bonded magnet, preparation method thereof and motor
  • Neodymium-iron-boron bonded magnet, preparation method thereof and motor

Examples

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preparation example Construction

[0025] In a typical embodiment of the application, a preparation method of NdFeB bonded magnet is provided, which comprises the following steps: S1, mixing phenolic resin, curing agent and NdFeB magnetic powder under heating conditions to obtain mixed rubber powder; S2, mixing the rubber powder and lubricant, and pressing to obtain a magnet compact, wherein the content of phenolic resin, curing agent, NdFeB magnetic powder and lubricant in the magnet compact is 2.5-6.0 wt%, 0.25-0.6 wt%, 93.3～97.15wt％% and 0.1-0.2 wt%, respectively; S3, performing sectional heating and curing on the magnet compact to obtain the NdFeB bonded magnet, wherein the sectional heating and curing is 2 to 4 sections of step-by-step heating and curing, the temperature of the sectional heating and curing is 105 to 195 DEG C, and the time is 30 to 60 minutes.

[0026] In this application, when mixing phenolic resin, curing agent and NdFeB magnetic powder, the heating and smelting method is adopted, which is d...

Embodiment 1

[0047] Mixing phenolic resin, curing agent and NdFeB magnetic powder in a reciprocating mixer at 95-105℃ for 30min to obtain mixed rubber; The mixed rubber and lubricant are mixed and pressed to obtain a magnet compact, and the pressing pressure is 10 tons / cm. 2 The types and contents of phenolic resin, curing agent, NdFeB magnetic powder and lubricant in magnet compacts are recorded in Table 1, and the internal mixing process and magnet manufacturing process are recorded in Table 2. Heating and curing the magnet compacts in sections to obtain NdFeB bonded magnets. The heating and curing steps are as follows: curing at 110℃ for 10min, curing at 130℃ for 10min, curing at 160℃ for 10min and curing at 190℃ for 10min, and the heating rate is 8℃ / min. Polyamide wax was purchased from Sentuo, Anhui.

[0048] The flow and process conditions of Examples 2 to 8 are the same as those of Example 1.

Embodiment 9

[0050] Mixing phenolic resin, curing agent and NdFeB magnetic powder in a reciprocating mixer at 70-80℃ for 30min to obtain mixed rubber powder; The rubber powder and lubricant are mixed and pressed to obtain a magnet compact, and the pressing pressure is 10 tons / cm. 2The composition of the magnet compact is the same as that of Example 2; Heating and curing the magnet compacts in sections to obtain NdFeB bonded magnets. The heating and curing steps are as follows: curing at 110℃ for 10min, curing at 130℃ for 10min, curing at 160℃ for 10min and curing at 190℃ for 10min, and the heating rate is 8℃ / min.

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Abstract

The invention provides a neodymium iron boron bonded magnet, a preparation method thereof and a motor. The preparation method comprises the steps that S1, phenolic resin, a curing agent and neodymium iron boron magnetic powder are smelted under the heating condition, and mixed rubber powder is obtained; s2, the mixed rubber powder and a lubricant are mixed and then pressed, a magnet pressed blank is obtained, and the content of phenolic resin in the magnet pressed blank is 2.5 wt%-6.0 wt%, the content of a curing agent in the magnet pressed blank is 0.25 wt%-0.6 wt%, the content of neodymium iron boron magnetic powder in the magnet pressed blank is 93.3 wt%-97.15 wt%, and the content of the lubricant in the magnet pressed blank is 0.1 wt%-0.2 wt%; and S3, the magnet pressed blank is subjected to segmented heating curing, the neodymium-iron-boron bonded magnet is obtained, segmented heating curing is 2-4 segments of step-by-step heating curing, the temperature of segmented heating curing ranges from 105 DEG C to 195 DEG C, and the time ranges from 30 min to 60 min. The strength of the obtained neodymium-iron-boron bonded magnet is greater than 120MPa, and the neodymium-iron-boron bonded magnet can pass a continuous operation test of a 100,000-speed motor.

Description

Technical field [0001] The invention relates to the technical field of preparation of bonded magnets, in particular to a NdFeB bonded magnet, a preparation method thereof and a motor. technical background [0002] Rare earth bonded magnet is made by pressing the mixture of rare earth iron boron magnetic powder, thermosetting epoxy resin and lubricant in a press mold, and then it is cured and coated, and finally applied to the motor. The existing mixing methods of bonded magnetic powder include dry mixing and wet mixing. [0003] Generally, in the dry mixing process, rare earth permanent magnet powder, thermosetting epoxy resin powder and lubricant are directly mechanically dispersed and mixed, and then the obtained rubber powder is subjected to magnet molding, curing, chamfering and coating treatment in turn. Dry mixing rare-earth magnetic powder with resin powder and lubricant, because of vibration and other factors in the charging process, and the weak binding force between lub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F1/10B22F3/02B22F3/10
CPCH01F1/0578H01F41/0266H01F41/0253B22F3/02B22F3/10
Inventor 何峰仝成利罗玉亮孙宝利
Owner 麦格昆磁(天津)有限公司
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