Integral type anisotropic multipolar ferrite bead and preparation method thereof

A ferrite magnetic ring, anisotropic technology, applied in the manufacture of inductors/transformers/magnets, magnets, magnetic objects, etc., can solve the failure of bonded magnetic tiles, increased cogging effect of motors, and shedding of magnetic tile parts, etc. question

Inactive Publication Date: 2013-04-24
NANTONG WANBAO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems in the design of such a magnetic tile bonded multi-pole magnetic ring: one is that the phenomenon of magnetic flux leakage is serious, and the uniformity of the magnetic flux distribution is also poor, which leads to an increase in the cogging effect of the motor; Or under high temperature, the glue bonding the magnetic tile may fail, causing the magnetic tile parts to fall off, which seriously affects the safety of the motor when it is used
However, due to the limitation of process conditions, compared with wet-pressed products, the magnetic properties of dry-pressed anisotropic ferrite products in my country are lower, and there is a lot of room for improvement.

Method used

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  • Integral type anisotropic multipolar ferrite bead and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Main component: Fe 2 o 3 : SrO=1: 5.5; Based on the sum of the quality of the main components, the kaolin addition: 0.35%; the calcium carbonate addition: 0.60%, and 1.0% of the nano-inorganic flux is batched, and the obtained mixture is ball milled, pre- Sintering, secondary formulation, secondary ball milling, pre-magnetization, dry pressing, sintering, grinding, inspection and other steps. Among them, the nano-inorganic flux is Bi with a mass ratio of 1:1 2 o 3 Powder and Bi 2 o 3 , and the DL602 silane coupling agent with a mass content of 3% relative to the inorganic flux is obtained by high-energy ball milling, the ball milling speed is 400 rpm, and the ball milling time is 10 hours.

[0025] In the above secondary ball milling process, 1.0 wt% camphor was added as a binder, and 0.5 wt% calcium stearate was added as a lubricant. Adhesive camphor is heated at 150°C and is in a molten state.

[0026] The dry pressing process is as follows: the ferrite magneti...

Embodiment 2

[0029] Main component: Fe 2 o 3 : SrO=1: 5.7; Based on the sum of the quality of the main components, kaolin add-on: 0.50%; Calcium carbonate add-on: 0.40%, nano inorganic flux 5.0% is batched, the mixture obtained is through ball milling, pre- Sintering, secondary formulation, secondary ball milling, pre-magnetization, dry pressing, sintering, grinding, inspection and other steps. Among them, the nano-modified flux is Bi 2 o 3 and WO 3 After the powder is mixed in a mass ratio of 2:1, it is obtained by adding γ-aminopropyltriethoxysilane accounting for 1% of the mass of the mixed powder and performing high-energy ball milling. The ball milling speed is 300 rpm and the ball milling time is 12 hours.

[0030] During the above secondary ball milling process, 0.8 wt% camphor was added as a binder, and 0.7 wt% calcium stearate was added as a lubricant. Adhesive camphor is heated at 180°C and is in a molten state.

[0031] The dry pressing process is as follows: the ferrite m...

Embodiment 3

[0034] Main component: Fe 2 o 3 : SrO=1: 5.6; Taking the mass sum of main components as a benchmark, kaolin add-on: 0.46%, calcium carbonate add-on: 0.53%, nanometer inorganic flux 5.0% carries out batching, the mixture that will be prepared is through ball milling, pre- Sintering, secondary formulation, secondary ball milling, pre-magnetization, dry pressing, sintering, grinding, inspection and other steps. Among them, the nano-modified flux is CuO, Bi 2 o 3 、WO 3After the powder is mixed in a mass ratio of 1:1:1, it is obtained by adding 3-aminopropyltriethoxysilane accounting for 4% of the mass of the mixed powder and performing high-energy ball milling. The ball milling speed is 300 rpm and the ball milling time is 12 hours.

[0035] In the above secondary ball milling process, 1.2 wt% camphor was added as a binder, and 0.3 wt% calcium stearate was added as a lubricant. Adhesive camphor is heated at 180°C and is in a molten state.

[0036] The dry pressing process is...

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Abstract

The invention discloses an integral type anisotropic multipolar ferrite bead and a preparation method thereof. The ferrite bead is composed of main composition and auxiliary composition. The main composition comprises ferric oxide and SrO by mass ratio of 1:5.5-1:5.7. On the basis of the sum of the mass of all main composition, the auxiliary composition comprises 0.35%-0.50% of kaolin, 0.40%-0.60% of calcium carbonate, and 1.0%-5.0% nanometer inorganic fluxing agents. According to the integral type anisotropic multipolar ferrite bead, residual magnetism Br is larger than or equal to 400mT, coercive force Hcb is larger than or equal to 245kA/m, intrinsic coercive force Hcj is larger than or equal to 250kA/m, and a maximum magnetic energy product (BH) is larger than or equal to 30kJ/m3.

Description

technical field [0001] The invention relates to an integral anisotropic multi-pole ferrite magnetic ring and a preparation method thereof. Background technique [0002] Anisotropic multi-pole ferrite magnetic rings are widely used in variable frequency air conditioner motors, mahjong machines, washing machines, oil pump motors, servo motors and stepping motors. In AC servo motors and brushless motors, as a permanent magnet of a stator or rotor, it is necessary to provide a periodically distributed surface magnetic field on one side around the rotating shaft, while ensuring that the difference in the magnetic flux distribution of each period is small. To provide the periodic magnetic field required above, the traditional method is: place magnetic tiles with the same shape, size, material properties and surface magnetic field around the main axis of rotation. The joint between the magnetic tiles is bonded with glue. There are two problems in the design of such a magnetic til...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/00H01F1/11H01F41/02
Inventor 周连明
Owner NANTONG WANBAO IND
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