Technical index of FE-2100HAB permanent magnet material automatic measuring device
※ The equipment meets the test initial magnetization curve (need to test the samples that have not been tested).
※ The equipment satisfies the test demagnetization curve (the rare earth permanent magnet sample needs to be pre-saturated and magnetized in the solenoid).
※ The equipment meets the test recovery curve (the user sets the H value to be less than Hcb according to the demagnetization curve of the material).
※ The equipment meets the test hysteresis loop (generally permanent magnets can be saturated magnetized in electromagnets and can be directly measured, and materials with good orientation and low Hcj, such as Hcj less than 1000kA/m, can also be directly measured).
※ The measurable parameters include: remanence Br, coercivity HcB, intrinsic coercivity HcJ, maximum energy product (BH) max, recoil permeability μrec, knee point Hk (H90) and squareness Hk/Hcj, etc. Characteristic parameters. Refer to the company's traceable flux meter Lakeshore480, Gauss meter BELL 6010 and AlNiCo standard samples tested with Magre C-750 permanent magnetic material hysteresis loop tester.
※ Measurable bulk material thickness: normal temperature coils can provide coils with a thickness of 1mm, and have already provided a thickness of 1.8mm for many companies (such as Ningbo Yunsheng, Fujian Changting Rare Earth, Chengdu Chenhang, Hangzhou Haisheng Technology, etc.) The H&J test coil is used for the measurement of thin devices. It can process thin coils with a thickness of 1mm at room temperature and temperature-resistant coils with a thickness of 2.5mm.
Note: For users with 1.8mm thin coils, the deviation of the thin coil test samples:
1. Using thin coils to test samples requires uniform orientation of the samples;
2. Corresponding to the rare earth permanent magnet samples with larger coercivity. As the thickness of the sample decreases, the Hcj will be larger. It can be extrapolated by testing samples of different thicknesses. This aspect has been done for more than a year. Research and publication of related papers require attention.
3. The powder sample test tool can be configured to measure the sample that is simply pressed with the binder. The measured data can be converted through the actual density and the density of the standard sample, providing a relevant reference for the magnetic properties of the standard sample. At present, the test powder in the products provided to users is bonding NdFeB magnetic powder, and the user unit: Zhejiang Institute of Metrology.
Precautions:
Because the powder material is not oriented, the required maximum magnetic field strength Hmax is higher.
Refer to the company's traceable flux meter Lakeshore480, Gauss meter BELL 6010 and AlNiCo standard samples tested with Magre C-750 permanent magnetic material hysteresis loop tester.
※ Accuracy of test parameters
Br: ±1%; HcB, HcJ: ±1.0%; (BH)max: ±2%
Test repeatability: Br: 0.3%; HcB, HcJ: 0.3%; (BH)max: 0.5%
※ Program-controlled excitation power supply:
Bipolar output power supply; output power: 2KVA; output voltage: ±100V; output current: ±20A; power control Hmax repeatability: better than 0.3%.
※ Fluxmeter:
1. Test range: 2.5mWb, 5mWb, 10mWb, 20mWb four gears, according to the input sample material and size, as well as the parameters of the test coil, automatically switch to the appropriate range.
2. Minimum resolution: 1uWb;
3. Zero drift: ≤1uWb;
4. Accuracy: better than 0.5%;
5. JH coil + flux meter can be used to measure magnetic polarization intensity J, and H coil + flux meter can be used to measure magnetic field intensity H.
6. The Hall probe can also be used to test the magnetic polarization intensity of H, B or J coils. The Hall probe has been strictly corrected, and its linearity is better than 0.3% (-2.5T~2.5T), which is convenient for users when there is no suitable test coil condition. Need for the next test;
7. The software is equipped with a standard magnetic field generation function. The user can use this function to complete the verification of the Gauss meter; the verification of the effective area of the B coil and the area of the residual turns of the J coil.
※ Measuring coil:
1. 1.8mm thin coil users:
2. The deviation description of the test sample using thin coils:
2-1. Using thin coils to test samples requires uniform orientation of the samples;
2-2. Corresponding to rare earth permanent magnet samples with larger coercivity. As the thickness of the sample decreases, the Hcj will be larger. It can be extrapolated by testing samples of different thicknesses. This aspect has been done for as long as one year. Many researches and related papers need to be paid attention to.
The relevant certificates of the Nationally Accredited Laboratories of China Institute of Metrology and Zhejiang Institute of Metrology (Zhejiang Fangzheng Calibration Co., Ltd.) can be provided. The material is permanent ferrite or AlNiCo samples with stable temperature characteristics. We use more calibration certificates provided by Zhejiang Fangzheng Calibration Co., Ltd., which are closer to the recognition of European users, and complete a series of scientific research at the same time.
The pure nickel sample is used to verify or calibrate the flux meter, but it has been cancelled as a passable standard sample due to the current NIST. Contact with the Chinese Academy of Metrology. At present, they do not have a pure nickel sample, so I will explain here.
※ Room temperature measurement parameters
The iron-cobalt alloy pole tip electromagnet with a 60mm shrinkage pole face at room temperature satisfies:
1. With a gap of 5mm, the magnetic field strength is greater than 2.8T;
2. With a gap of 10mm, the magnetic field strength is greater than 2.5T;
3. There is a temperature probe to measure the temperature of the pole or sample, and it is automatically recorded in the measurement software.
The iron-cobalt alloy pole electromagnet with a 100mm shrinkage pole face at room temperature is used to provide sufficient uniformity for the measurement of larger samples. The magnetic field meets the following requirements:
1. With a gap of 5mm, the magnetic field strength is greater than 1.8T;
2. With a gap of 10mm, the magnetic field strength is greater than 2.0T;
3. There is a temperature probe to measure the temperature of the pole or sample, and it is automatically recorded in the measurement software.
※ High temperature measurement parameters
Shrink the iron-cobalt alloy pole head with a pole face of 80mm under high temperature conditions:
1. The highest temperature: 220℃;
2. With a gap of 5mm, the magnetic field strength is greater than 2.1T;
3. The sample is clamped and the sample is heated by the upper and lower poles;
4. There is a temperature probe to measure the temperature of the pole or sample, and it is automatically recorded in the measurement software.
