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Introduction to Measurement of Magnetic Properties of Permanent Magnet Materials
Release time:
2019-08-02
Source:
Www.fe2100.com
In this paper, the object of measurement of permanent magnet materials is various types of permanent magnet materials, including AlNiCo, permanent magnet ferrite, rare earth permanent magnet materials and other types, the shape of the material is mainly: round, square, ring, tile, etc.
Ferromagnetic or ferrimagnetic materials are generally considered to be magnetic materials, and these magnetic materials can be further divided into two separate categories:
soft magnetic material,
permanent magnetic materialThe main judgment is based on the coercivity of the material. According to the recommendations of the IEC404-1 standard, the coercivity of 1000A/m is the boundary between the two materials.
In this paper, the object of measurement of permanent magnet materials is various types of permanent magnet materials, including AlNiCo, permanent magnet ferrite, rare earth permanent magnet materials and other types, the shape of the material is mainly: round, square, ring, tile, etc.
Currently commonly used important permanent magnet materials are:
(1) Rare earth permanent magnet materials, which are a large class of permanent magnet materials in the current magnetic energy product, are intermetallic compounds (also known as intermetallic compounds) with rare earth elements and iron elements as the main components. NdFeB rare earth alloy permanent magnet material developed and produced in China.
(2) metal permanent magnet materials. This is a large class of development and application of iron and iron group elements (such as nickel, cobalt, etc.) as an important component of the alloy type permanent magnet materials, mainly aluminum nickel cobalt (AlNiCo) and iron chromium cobalt (FeCrCo) two major categories of permanent magnet alloys. The performance and cost of aluminum-nickel-cobalt alloy permanent magnet are medium, developed earlier, and the performance varies with the chemical composition and manufacturing process in a wide range, so the application range is also wide. Iron-chromium-cobalt permanent magnetic alloy is characterized by medium permanent magnetic properties, but its mechanical properties can be a variety of mechanical processing and cold or hot plastic deformation, can be made into tubular, sheet or linear permanent magnetic materials for a variety of special applications.
(3) Ferrite permanent magnet materials. This is a composite oxide strong magnetic material with Fe2O3 as the main component (narrow sense) and magnetically ordered materials such as antiferromagnetic materials (broad sense). It is characterized by high resistivity, which is particularly beneficial in high frequency and microwave applications. For example, barium ferrite (BaFe12O19) and strontium ferrite (SrFe12O19) have many applications. In addition to the above three types of permanent magnet materials, there are some permanent magnet materials with their own characteristics of manufacturing, magnetism and application. For example, micro-powder permanent magnet materials, nano permanent magnet materials, plastic permanent magnet materials (can be applied to the refrigerator door closed), can be processed permanent magnet materials.
According to GBT 3217-2013 "Magnetic Test Method for Permanent Magnetic Materials,Measurement of magnetic properties of permanent magnet materialsThe contents mainly include the following magnetic properties parameters: saturation magnetization field strength Hmax and remanence Br; Coercive force Hcb, intrinsic coercive force Hcj; Maximum magnetic energy product (BH)max, recovery permeability μrec; Hysteresis loop or demagnetization curve
The measurement of magnetic properties of permanent magnetic materials requires a dedicated test system to measure the magnetic properties of permanent magnetic materials. Compared with the DC test of soft magnetic materials, the measurement of permanent magnetic materials has the following differences:
a) The permanent magnetic material measurement will produce a higher magnetic field strength H, the magnetic field strength should be at least 5 times greater than the coercivity Hcj, and the magnetic field should be established slowly enough to avoid problems related to eddy currents.
B) Electromagnet is generally used as the magnetic field source for the measurement of permanent magnet materials, and its structure shall be specially designed, and the tapered magnetic pole shall be composed of iron-cobalt alloy.
c) The measurement of permanent magnetic materials not only needs to determine the magnetic field strength H and magnetic induction B, but also needs to determine the polarization J that is significantly different from B (usually not suitable for soft magnetic materials).
The permanent magnetic material measuring device is mainly composed of excitation power supply, electromagnet, B & H measuring instrument, computer and software, suchHunan Yongyi Technology Co., Ltd.FE-2100H permanent magnetic material measuring device, Completely follow GB/T3217-2013 and IEC60404-5, as shown in the following figure:
Automatic measuring device for FE-2100H permanent magnetic materialsHardware Features
● measurable materials: ferrite, aluminum nickel cobalt, neodymium iron boron and samarium cobalt, rare earth and other permanent magnet materials;
● Measured sample shapes: permanent magnetic materials in the shape of cylinders, squares, rings and tiles;
● Measured magnetic properties: magnetic properties parameters such as remanence Br, coercivity Hcb, intrinsic coercivity Hcj and maximum magnetic energy product BHmax;
● Measurable temperature range: meet the normal temperature to 200 ℃ permanent magnet material temperature curve measurement; (optional)
● Electromagnet design features: the use of pole lock structure design, changed the traditional electromagnet locking difficult physical problems;
● Easy to operate: In addition to setting permanent magnet measurement parameters and placing samples, the test process is completed at one time and the measurement time is short;
Automatic setting range: the use of microcomputer control and A/D, D/A conversion technology, automatic setting of test magnetic field and test range;
Accuracy: automatic correction of integral drift and Hall probe nonlinear, so as to ensure the accuracy of measurement data;
● Optional test tooling:
(1) Different tooling can be selected according to sample testing needs;
(2) Provide flat pole head, shrinking pole head, heating pole head or tile pole head required for testing;
(3) Provide a fixed J-coil that matches the sample.
Automatic measuring device for FE-2100H permanent magnetic materials
Software Features
● Operating system: Win XP/7/8/10 Chinese or English operating system;
Language display: support Chinese or English bilingual display;
● Operating characteristics:
(1) The test waveform curve is displayed in real time during the measurement, and the measurement can be stopped at any time;
(2) The software can display up to 4 measurement curves at the same time, and compare the differences under different conditions more intuitively;
(3) The software has built-in temperature coefficients of various materials, which can provide data reference for temperature correction;
(4) The measurement cycle is 30-120 seconds (depending on the sample type and the proficiency of the operator);
● Storage Features:
(1) The measurement results are automatically saved (saved by test number or saved by manual intervention)
(2) sample number, size, parameters and other data can be automatically saved to reduce manual errors;
(3) The software has a print preview function, and can also directly print the measurement results and test curves;
(4) The measurement results and test curves can be output in graphic formats such as BMP, and can also be exported in the form of data tables, and can be used for statistical processing by software such as Excel;
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