Device and method for measuring temperature coefficient of permanent magnet material based on accelerometer

Abstract

The invention discloses a device and a measuring method for measuring the temperature coefficient of a permanent magnet material based on an accelerometer, wherein the device includes a flexible pendulum accelerometer, and the flexible pendulum accelerometer includes a housing and a housing respectively located at the top of the housing. And the measured permanent magnet at the bottom, the housing includes a hollow body, and a cover at both ends of the body that matches the body and is detachably connected. The body is detachably connected, and also includes a thermostat, a turntable, a signal acquisition circuit and a controller. The invention proposes a new measuring device and method. The permanent magnet used to generate the magnetic field in the flexible pendulum accelerometer is used as the measured permanent magnet to measure its temperature coefficient. The invention adopts the closed magnetic circuit structure of the flexible pendulum accelerometer, which overcomes the influence of the external environment on the measurement accuracy and repeatability to the greatest extent, and realizes the high precision, high accuracy and high repeatability of the measurement.

Description

technical field [0001] The invention relates to a temperature coefficient measuring device and method, in particular to a device and a measuring method for measuring the temperature coefficient of a permanent magnet material based on an accelerometer. Background technique [0002] In the application field of permanent magnet materials, permanent magnets in some special application fields, such as high-stable rare earth permanent magnets used in key components of aircraft in the field of defense such as aviation, aerospace and spacecraft, have magnetic properties that directly affect the technical level of related fields. Due to the special high requirements of accuracy, reliability and safety, the above-mentioned fields require that the magnetic properties of permanent magnet materials do not fluctuate with temperature changes. The inertial navigation devices of aircraft and spacecraft must use permanent magnet materials with extremely low temperature coefficients. Therefore...

AI Technical Summary

Problems solved by technology

Among them, the measurement resolution of the closed magnetic circuit method is 10-4 / °C. With the development of the research and application of extremely low temperature coefficient permanent magnet materials to the order of 10-5 / °C or even 10-6 / °C, the existing closed magnetic The road scanning method cannot meet the measurement requirements

Although the measurement resolution of the open magnetic circuit method can reach the order of 10-5 / °C, due to the open magnetic circuit method such as the magnetic flux method and the magnetic balance method, the measurement has too high requirements for the measurement environment. For example, the measurement instrument system requires Various surrounding electromagnetic, power supply circuits, geomagnetic and other factors need to be specially treated to establish a shielding room. At the same time, there are also special requirements for the measurement operator. Therefore, the existing open magnetic circuit method is difficult to overcome the interference of the surrounding environment, and there are measurement problems. Repeatability and accuracy cannot meet the measurement requirements

And there is no published literature report on the measurement method of extremely low temperature coefficient

At present, there is a lack of methods and equipment for permanent magnet materials with extremely low temperature coefficients in China, and foreign countries strictly keep confidential and embargo such technical measurements, thus limiting the research and application technology development of extremely low temperature coefficient permanent magnet materials.

[0004] At present, the open magnetic circuit method and the closed magnetic circuit scanning method for measuring the temperature coefficient of permanent magnet materials are limited by the measurement principle and measuring instruments. For permanent magnet materials with extremely low temperature coefficients, the resolution and accuracy of temperature coefficient measurement , the repeatability cannot meet the requirements

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