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Measurement method of magnetic declination of permanent magnet
Release time:
2019-12-09
Source:
Www.fe2100.com
With the deepening of the application of permanent magnets, magnetic declination has become an important factor affecting the performance of precision magnetic devices. For example, in precision magnetic levitation devices, if the magnet has a large magnetic declination angle, the rotor and stator of the magnetic levitation bearing will also have a magnetic deviation angle of the same magnitude when they are suspended. The existence of this deviation angle will greatly affect the performance of magnetic levitation, and even cause the magnetic levitation bearing to be unable to suspend normally and stably. The existence of magnetic declination angle will cause adverse effects such as system asymmetry, eccentricity and poor dynamic performance.
magnetic declination of permanent magnetRefers to the offset angle of the final magnetization vector direction of the permanent magnet. In the process of magnetic orientation molding of permanent magnets, the orientation direction of the product is not parallel to the orientation magnetic field direction, resulting in magnetic declination, or in the process of handing over the product, the product geometry is not aligned when clamping the product.
Magnetic declination is generated between the axis of symmetry and the magnetic axis of the product.magnetic declinationThe existence of the magnet produces a magnetic field in the non-magnetized direction, forming a stray magnetic field. With the deepening of the application of permanent magnets,magnetic declinationIt has become an important factor in the performance of precision magnetic devices. For example, in precision magnetic levitation devices,
If the magnet has a large magnetic declination angle, the rotor and stator of the magnetic bearing will also have a magnetic deviation angle of the same magnitude when the magnetic bearing is suspended. The existence of this deviation angle will greatly affect the performance of the magnetic suspension, and even cause the magnetic suspension bearing to be unable to be suspended normally and stably.
The existence will cause adverse effects such as system asymmetry, eccentricity, and poor dynamic performance. In addition, in the application of the motor, the large magnetic declination not only makes the magnetic properties of the permanent magnet not fully utilized, but also deteriorates the performance of the motor. Therefore, magnetic declination has become a measure of permanent
An important indicator of magnetic properties, the measurement of magnetic declination has been paid more and more attention.
At present, in most of the production process of magnetic materials, the accuracy and consistency of the magnetizing direction of the material are not demanding. However, as the application field of magnetic materials becomes wider and wider, the precision of permanent magnets is also getting higher and higher. Compared with the requirements of traditional magnetic materials, the new application technology
Because the final magnetization vector direction (magnetic declination angle) of the permanent magnet has an extremely important influence on the performance of precision magnetic components, the magnetic declination angle of the permanent magnet is an important indicator to measure the performance of the permanent magnet, and the magnetic declination angle of the FE-2100AM permanent magnet is
The enterprise provides an effective measurement scheme to solve the production of high-end magnetic materials.
FE-2100AM permanent magnet magnetic declination measuring instrumentby three-dimensional
Helmholtz coilConnecting an independent three-component fluxmeter to form a hardware test part, a complete set of permanent magnet material quality test system is formed by microcomputer conversion of the test data of the three components. Put the magnet into the sample
On the stage, the magnetic flux component is tested by the pull method, and the magnetic moment and the magnetic field deviation angle value of the spindle direction are obtained by calculation. The total magnetic moment M, the main shaft declination α, Øx, Øy, Øz, and the coil constant of the corresponding test coil can be displayed.
We know that a single
Helmholtz coilIt can be used to measure the magnetic moment M generated by the magnetic moment of the permanent magnet on the magnetization direction axis. The magnetic moment M can be obtained by the relationship: M = k×Φ, where: k is the Helmholtz coil constant, Φ is the magnet pair coil
Induced magnetic flux. For the quality inspection of permanent magnetic material samples after magnetizing, the use of Helmholtz coils for quantitative transfer between buyers and sellers has become very popular and universal, and the design of single-dimensional and three-dimensional Helmholtz coils to participate in the mutual transfer between international counterparts.
The delivery parameters are especially important.
The direction of the magnetic moment of an anisotropic magnet is always along the direction of the anisotropy, but there may be a case where the direction of the anisotropy does not coincide with the direction of the magnet axis. When it is necessary to display the projection of the anisotropy direction of the magnetic block in the axis direction of the magnetic block itself, it is necessary to display the orthogonal direction at the same time.
Three axes of magnetic flux Øx, Øy, ØzHelmhorus coiland can be converted into orthogonal component magnetic moment Mx, My, Mz.
The magnetic moment M is a vector and can be divided into three parts in three directions, respectively: the three directions of X, Y, and Z are consistent. The projection relations are: cos α x = Mx/M, cos α y = My/M and cos α z = Mz/M.
By measuring the magnetic flux on the three-axis coil: Φx, Φy, Φz, the magnetic moments in three directions: Mx, My, Mz are calculated according to the constants corresponding to each coil. The total magnetic moment M of the permanent magnet material can also be obtained by finding the square of the magnetic moment of each component and the square of the square.
Measuring principle of FE-2100AM permanent magnet magnetic declination measuring instrument
FE-2100AM permanent magnet magnetic declination measuring instrument measuring software screenshot
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