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Gradual magnet with magnetic field distributed evenly along axial direction

An axial direction, uniform distribution technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of small magnetic field space, reduced bias magnetic field size and uniformity, and difficult to change the magnetic field value of permanent magnets flexibly , to achieve the effect of reducing production costs

Inactive Publication Date: 2008-02-20
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the magnetic field space is small, the uniformity is not high, the field value is not high, and the magnetic field value of the permanent magnet is not easy to change flexibly
[0003] In December 2000, published by Beijing University of Technology Press, Xia Pingchou's "Permanent Magnet Mechanism" on pages P76-P78, the use of permanent magnets is limited to the length-to-diameter ratio of active materials L / R≤3.5 (L means active The total length of the material, R is the radius of the active material), otherwise the size and uniformity of the corresponding bias magnetic field will be drastically reduced

Method used

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  • Gradual magnet with magnetic field distributed evenly along axial direction
  • Gradual magnet with magnetic field distributed evenly along axial direction
  • Gradual magnet with magnetic field distributed evenly along axial direction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Hollow ellipsoidal three-segment gradient magnet (as shown in Figure 2)

[0026] Different spherical outer diameters, the magnetic field is evenly distributed along the axial direction.

[0027] For the 80mm long smart material rod (TbDyFe rod), the 110mm long gradient permanent magnet of the present invention consisting of three sections is adopted in the present invention, and the upper and lower sections are respectively symmetrical with the central section. The design is based on the idea of ​​gradual change in shape, that is, with a certain size of spherical outer diameter as the design goal, by changing the size of each segment of the magnet, the magnetic field of the hollow ellipsoidal permanent magnet of the present invention is evenly distributed along the axial direction. The permanent magnet material is NdFeB, and the remanence B r =1.423T, the magnetic field of the hollow ellipsoidal permanent magnet is 450 Oe, and the center line of the magnet ...

Embodiment 2

[0041] Example 2: Hollow cylindrical five-segment gradient magnet (as shown in Figure 3)

[0042] Different remanence, the magnetic field is evenly distributed along the axial direction.

[0043] For the active material telescopic rod (TbDyFe rod) of 80mm long, adopt the 110mm long gradual change permanent magnet of the present invention that is made of five sections in the present invention, upper ball section 2, lower ball section 3 and upper transition section 4 and lower transition section 5 are respectively symmetrical to the central section 1. The design is based on the idea of ​​remanence gradient, that is, with a certain size of magnetic field as the design goal, by changing the magnetic field required by each segment of the magnet, the magnetic field of the hollow cylindrical permanent magnet of the present invention is evenly distributed along the axial direction. The permanent magnet material is NdFeB, and the remanence B r =1.42T, the magnetic field of the holl...

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Abstract

This invention relates to one anamorphism magnetism distributed evenly along magnetic field axis direction, which comprises upper sphere section, center section and down section with hollow center, wherein, the upper and down sections are located on the top and down position of the center section with different electrode binding; the upper and down sections have same inner and outer radium's lengths with same inner radium; the magnetic field distribution of each section as H(z,R2)=-Br / 2mu0[[(z. +l) / (z+l)2R22-(z-l) / (z-l)2+R22]. The invention is made by the requirements of the intelligent materials needed magnetic size to change magnetic sphere outer radium or remaining field size.

Description

technical field [0001] The present invention relates to a permanent magnet used in active material devices, more specifically, it refers to a multi-body gradient and remanence gradient multi-segment magnet with different polarity joints whose magnetic field is evenly distributed along the axial direction of the magnet Permanent magnets. Background technique [0002] For the bias magnetic field applied to active material devices (smart material rods), two methods are generally used: excitation coils or permanent magnets. The excitation coil is used to provide the bias magnetic field, its size is adjustable, and the magnetic field is relatively uniform, but it will continue to consume electric energy during use, and the DC coil is seriously heated. Therefore, in practical applications, permanent magnets are often used to provide bias magnetic fields. The permanent magnet uses the residual magnetism of the permanent magnet material to generate the magnetic field. Its main fea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/032
Inventor 张天丽徐惠彬蒋成保
Owner BEIHANG UNIV