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Permanent magnet magnetic performance temperature coefficient measurement and variable temperature/high temperature permanent magnet magnetic performance monitoring device

A technology of temperature coefficient and monitoring device, applied in the direction of magnetic performance measurement, measurement device, measurement of magnetic variables, etc., can solve the problems of difficulty in measuring and monitoring the magnetic performance of permanent magnets, complicated methods, etc., and achieve cost saving, simple method and long life. long lasting effect

Active Publication Date: 2021-01-26
HEBEI UNIV OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the measurement and monitoring of the magnetic properties of permanent magnets under variable temperature / high temperature is difficult and the method is complicated, the invention proposes a device for measuring the temperature coefficient of magnetic properties of permanent magnets and monitoring the magnetic properties of variable temperature / high temperature permanent magnets

Method used

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  • Permanent magnet magnetic performance temperature coefficient measurement and variable temperature/high temperature permanent magnet magnetic performance monitoring device
  • Permanent magnet magnetic performance temperature coefficient measurement and variable temperature/high temperature permanent magnet magnetic performance monitoring device
  • Permanent magnet magnetic performance temperature coefficient measurement and variable temperature/high temperature permanent magnet magnetic performance monitoring device

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Embodiment 1

[0083] Embodiment 1: Experiments were conducted using FeCo waveguide wires and a device capable of adjusting the magnitude of the axial magnetic field under normal temperature conditions. The purpose of this embodiment is to measure the relationship between the output voltage and the axial magnetic field using FeCo waveguide wire at room temperature (25°C).

[0084] The construction of the experimental platform: the permanent magnet is placed 60cm away from the left side of the detection coil. The circular permanent magnet used in the experiment is made of samarium cobalt YX28. The measuring device is taken out to facilitate the experiment, and the output voltage value of the detection coil is observed and recorded by a computer.

[0085] Experimental process and results: such as Figure 9 As shown, at 25°C, the pulse current increases from 2A to 40A with a step size of 2A, and the axial magnetic field strength increases from 5kA / m to 100kA / m with a step size of 5kA / m. The ex...

Embodiment 2

[0088] Example 2: Using figure 1 The shown device measures the temperature coefficient of a permanent magnet with a temperature coefficient of -0.05%, to verify the accuracy and feasibility of the experimental device.

[0089] The construction of the experimental platform: put the permanent magnet on the measuring rod 60cm away from the left side of the detection coil, put it into the heating furnace, fix it with a permanent magnet fixing device, and then control the temperature of the heating furnace to rise from 20°C to 270°C with a step size of 50°C , measure the axial magnetic field at each temperature, and then calculate the temperature coefficient according to the measured data, and compare it with the known temperature coefficient of the permanent magnet.

[0090] Experimental process and results: The experimental results are as follows: Figure 11 As shown, the minimum temperature coefficient in the temperature range of 220-270°C is -0.0571%, and the maximum temperat...

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Abstract

The invention relates to a permanent magnet magnetic performance temperature coefficient measurement and variable-temperature / high-temperature permanent magnet magnetic performance monitoring device.The device comprises an ampere meter, a temperature display, an insulating brick, a thermocouple, a computer, a measuring device, a heating furnace and a fixing device, the measuring device comprisesa measuring rod, a connecting device, an elastic device and a magnetic shielding device; the connecting device is composed of a hoop and a base; the base is in a cuboid shape, and the hoop is arrangedon the left portion of the base. a rectangular groove is formed in the right part, two sliding rails are arranged in the groove, and an elastic device is mounted in the groove; the tail end of the measuring rod is placed in a groove in the inner wall of the heating furnace; and the head end extends out of the heating furnace, is arranged on the left side of the damper and is horizontally fixed bythe hoop. The device can be used for measuring the temperature coefficient of a permanent magnet at high temperature and monitoring the magnetic performance of the permanent magnet at high temperature, the working temperature can reach 600 DEG C, the price is low, the service life is long, and the method is simple.

Description

technical field [0001] The invention relates to a technique for measuring the magnetic properties of permanent magnets, which can be used for measuring the temperature coefficient of the magnetic properties of permanent magnets under variable temperature / high temperature and for monitoring the magnetic properties of permanent magnets used in actual devices in variable temperature / high temperature working environments. Background technique [0002] In recent years, with the development of permanent magnet materials, it has been widely used in traveling wave tubes, inverter air conditioners, new energy vehicle motors, wind power, aerospace and national defense and other fields. In these fields, permanent magnets generally work in variable temperature environments or even high temperature environments, and the magnetic properties of permanent magnets will change with temperature changes. The magnetic performance of permanent magnets is an important factor affecting the performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12G01R33/00
CPCG01R33/12G01R33/007
Inventor 李明明程天宇王千牛小东李保良张原野
Owner HEBEI UNIV OF TECH
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