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Magnetic material temperature feature testing method

A magnetic material and testing method technology, applied in the direction of magnetic performance measurement, etc., can solve the problems of low test accuracy, few structural elements of the magnetic flux test method, and unsuitable test requirements, etc., and achieve high test accuracy, high-precision closed-loop test, Wide range of effects

Active Publication Date: 2015-06-17
FLIGHT AUTOMATIC CONTROL RES INST
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Problems solved by technology

[0005] The magnetic flux test method has few structural elements and simple operation, but the test process is affected by the degree of heat dissipation of the sample, whether the coil section is perpendicular to the measured magnetic field, the coil pulling distance, that is, the residual magnetic field at the coil termination position, the coil temperature deformation, and the surrounding environment interference, etc. Influenced by factors, the test accuracy is not high, and the resolution is up to hundreds of ppm / °C, which is not applicable to the high-precision temperature coefficient test requirements

Method used

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Embodiment Construction

[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] A kind of embodiment step of the test method of magnetic material temperature characteristic of the present invention is as follows:

[0021] Step 1, build a special test device: the special test device is a force balance device, including a balance pendulum, one end of the balance pendulum is the input end, and the other end is the balance end. The working principle of the device is that the input quantity is applied to the balance The input end of the pendulum makes it deflect, and the balance end will generate a balance amount equal to the input amount to pull back the position of the pendulum to keep it in balance, see figure 1 , and the balance quantity will change with the change of the input quantity. In this force balance device, the balance end is a torque generator, which is composed of a measured magnetic material 4, a mag...

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Abstract

The invention relates to a magnetic material temperature feature testing method, which belongs to the technical field of material testing. The method comprises the following steps: 1, a special testing device is built; 2, n temperature sampling points are selected, wherein n is a natural number no smaller than 2; 3, the special testing device with tested magnetic material is fixed on a rotating table, the temperature environment is the ith temperature sampling point Ti, the rotating table is rotated, a weight m fixed at the input end of a compensation wheel enables the compensation wheel to deflect under the effect of a gravitational acceleration g, current Ii is then generated in a current coil, and the value of the current Ii is measured, wherein i=1, 2, to n; and 4, at different temperature sampling points, the tested magnetic material has different magnetic induction intensities B, I passing through a torque coil is different, and thus temperature features of the tested magnetic material can be obtained. The method of the invention is high in testing precision and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of material testing and relates to a testing method for temperature characteristics of magnetic materials. technical background [0002] Permanent magnet material is a kind of functional material. The magnetic performance parameters Br, Hcj, Hcb, (BH)max, etc. determine the type and performance of the permanent magnet material, and the temperature characteristics determine the applicability of the material. Therefore, the temperature characteristic test of magnetic materials is an important part of a comprehensive evaluation of the material. [0003] The magnetic flux test method is currently the most widely used method for testing the temperature characteristics of permanent magnet materials, that is, the temperature characteristics of the permanent magnet materials are evaluated by testing the magnetic flux values ​​of the permanent magnet materials at different temperatures. Put the rectangular or cylind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
Inventor 张珂白晓荣李鹏飞
Owner FLIGHT AUTOMATIC CONTROL RES INST
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