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High-performance dry-pressed permanent magnet ferrite rotor and manufacture method thereof

A technology of ferrite and a manufacturing method, which is applied in the manufacturing field of high-performance dry-pressed permanent magnet ferrite rotors, can solve problems such as performance that cannot meet market demands, and achieve the effects of improving performance indicators, easy operation, and excellent performance.

Inactive Publication Date: 2017-09-26
HANYU GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the miniaturization, high-density and high-definition requirements of electronic products, micro-special motors are small, light and thin, and realize energy saving / miniaturization to meet the needs of electronic product development. This undoubtedly requires higher magnetic properties, and dry-pressed products The performance is generally at the level of Br 360-375mT, HC 250-270KA / m, and the performance can no longer meet the market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 A high-performance dry-pressed permanent magnet ferrite rotor and its manufacturing method

[0027] A high-performance dry-pressed permanent magnet ferrite rotor is prepared from the following raw materials by weight percentage:

[0028] The ferrite magnetic powder is 97.4wt%, and the particle size of the magnetic powder is 0.8-1.0μm;

[0029] Accessories: camphor powder 1.2wt%, boric acid (H 3 BO 3 ) 0.2wt%, calcium stearate (C 36 H 70 CaO 4 ) 1wt%, silicon dioxide (SiO 2 ) 0.2%.

[0030] The manufacturing method of the high-performance dry-pressed permanent magnet ferrite rotor in this example includes the following steps:

[0031] (1) this example raw material is crushed and puffed to obtain powder;

[0032] (2) The powder obtained in step (1) is oriented and formed into a green body at one time, and the pressing method is bidirectional pressing, the pressure of the oil cylinder is 20MPa, and the size of the external forming magnetic field is: 16...

Embodiment 2

[0038] Embodiment 2 A high-performance dry-pressed permanent magnet ferrite rotor and its manufacturing method

[0039] A high-performance dry-pressed permanent magnet ferrite rotor is prepared from the following raw materials by weight percentage:

[0040] The ferrite magnetic powder is 94.8wt%, and the particle size of the magnetic powder is 0.8-1.0μm;

[0041] Accessories: camphor powder 2.0wt%, boric acid (H3 BO 3 ) 0.6wt%, calcium stearate (C 36 H 70 CaO 4 ) 1.6wt%, silicon dioxide (SiO 2 ) 1.0 wt%.

[0042] The manufacturing method of the high-performance dry-pressed permanent magnet ferrite rotor in this example includes the following steps:

[0043] (1) this example raw material is crushed and puffed to obtain powder;

[0044] (2) the powder obtained in step (1) is oriented and formed into a green body at one time, and the pressing method is two-way pressing, the pressure of the oil cylinder is 35MPa, and the size of the external forming magnetic field is: 1600 ...

Embodiment 3

[0050] Embodiment 3 A high-performance dry-pressed permanent magnet ferrite rotor and its manufacturing method

[0051] A high-performance dry-pressed permanent magnet ferrite rotor is prepared from the following raw materials by weight percentage:

[0052] The ferrite magnetic powder is 95.8wt%, and the particle size of the magnetic powder is 0.8-1.0μm;

[0053] Accessories: camphor powder 1.8wt%, boric acid (H 3 BO 3 ) 0.5wt%, calcium stearate (C 36 H 70 CaO 4 ) 1.2wt%, silicon dioxide (SiO 2 ) 0.7 wt%.

[0054] The manufacturing method of the high-performance dry-pressed permanent magnet ferrite rotor in this example includes the following steps:

[0055] (1) this example raw material is crushed and puffed to obtain powder;

[0056] (2) the powder obtained in step (1) is oriented and formed into a green body at one time, and the pressing method is bidirectional pressing, the pressure of the oil cylinder is 50MPa, and the size of the external forming magnetic field i...

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Abstract

The invention discloses a high-performance dry-pressed permanent magnet ferrite rotor and a manufacture method thereof; the high-performance dry-pressed permanent magnet ferrite rotor is made from, by weight, 94.8-97.4% of ferrite magnet powder, and the balance of auxiliaries, including camphor powder, boric acid, calcium stearate, and silicon dioxide. The components of the high-performance dry-pressed permanent magnet ferrite rotor are selected and matched appropriately, the manufactured high-performance dry-pressed permanent magnet ferrite rotor has excellent properties, the manufacture method is easy to perform, the production cost is lowered, the use of secondary orientation gives rise to reduced repelling and friction between magnetic poles during magnet powder forming and improved orientation degree of magnet powder, and the performance indexes of the permanent magnet ferrite rotor are effectively increased.

Description

technical field [0001] The invention relates to a permanent magnet ferrite rotor and a manufacturing method thereof, in particular to a manufacturing method of a high-performance dry-pressed permanent magnet ferrite rotor. Background technique [0002] The forming process of permanent magnet ferrite rotor is mainly divided into two methods: dry pressing and wet pressing. Although the performance of wet pressing permanent magnet is generally higher than that of dry pressing permanent magnet, the process of wet pressing from powder forming to finished product is cumbersome. The molding qualification rate is low and the production efficiency is slow, and the dry pressing molding method is better than the wet pressing molding, with fast molding efficiency and high qualification rate, which is convenient for the production of miniaturized and complex products. [0003] As one of the core components of micro-motors, permanent magnet ferrite rotors are widely used in home appliance...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/63C04B35/632C04B35/626
CPCC04B35/26C04B35/622C04B35/62605C04B35/6303C04B35/632C04B2235/3409C04B2235/3418C04B2235/449C04B2235/605
Inventor 梁中成
Owner HANYU GRP CO LTD
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