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Measuring set and method for degree of orientation of ring axial charging permanent magnet

A technology of axial magnetization and measurement method, applied in the direction of the size/direction of the magnetic field, which can solve the problems of the influence of the orientation degree, and achieve the effect of ensuring quality and high degree of automation

Active Publication Date: 2014-02-12
SANVAC BEIJING MAGNETICS +1
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Problems solved by technology

[0003] However, in the orientation of magnetic powder pressing, in the "rounding" of machined squares, in the slicing of cylindrical blanks, and in the hollowing of cylindrical blanks, it is possible to affect the final annular axially magnetized sintered NdFeB The degree of orientation of the magnet in the finished stage affects the

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  • Measuring set and method for degree of orientation of ring axial charging permanent magnet
  • Measuring set and method for degree of orientation of ring axial charging permanent magnet

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[0033] Example: Measure the orientation degree of the axially magnetized ring with the specification of D18-d13.3-3

[0034] In this device, the rotation speed of the engine rod 10 is 3500 rpm, thus the frequency of the induced voltage is 58.3Hz, ω=366.5rad / s, and the Helmholtz coil constant is k=1.522*10 -4 m.

[0035] Substitute the above values ​​into the formula: Ueff=0.01234mαω / k

[0036] Get: Ueff=2.972*10 4 *m*α / mV

[0037] The magnetic moment of this ring 100 is 500*10 -9 , the misorientation will cause the voltmeter to read 14.86mV / degree.

[0038] According to the above derivation, the voltage indication value of the multimeter 15 can be converted into the orientation degree of the ring-shaped axially magnetized sintered NdFeB magnet 100 in the finished product stage: α=Ueff / 14.86

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Abstract

A measuring device for the orientation degree of an annular axial direction magnetizing permanent-magnet, which is characterized by comprising a Helmholtz coil connected with a multimeter in series, wherein, the input / output end of the multimeter is connected with a capacitor in parallel; a rotary table with a drive rod thereof vertical to the rotary table and arranged at the geometric centre of the Helmholtz coil, the rotary table is driven to rotate by a drive motor; and a frock clamping apparatus which is provided with a part for fixing the annular axial direction magnetizing permanent-magnet at the center of the upper surface of the rotary table and the geometric centre of the Helmholtz coil vertical to the rotary table direction. The invention can fast, simply and legibly carry out precise detection to the orientation degree of the annular axial direction magnetizing permanent-magnet so as to guarantee the quality of the products.

Description

technical field [0001] The present invention relates to a device and method for measuring the degree of orientation of a ring-shaped axially magnetized permanent magnet. More specifically, the present invention relates to a device for measuring the degree of orientation of a ring-shaped sintered NdFeB magnet that has undergone axial magnetization. and measurement methods. Background technique [0002] The orientation degree of circular axially magnetized sintered NdFeB magnets in the finished product stage is an important indicator to measure the quality of products. [0003] However, in the orientation of magnetic powder pressing, in the "rounding" of machined squares, in the slicing of cylindrical blanks, and in the hollowing of cylindrical blanks, it is possible to affect the final annular axially magnetized sintered NdFeB The degree of orientation of the magnet in the finished stage is affected. [0004] For this reason, it is particularly important to be able to quick...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/02
Inventor 杨雁蔡喆伦赵玉刚李原孙立柏俞健苑
Owner SANVAC BEIJING MAGNETICS