Permanent magnet materials according to the processing technology is divided into: sintering, bonding, casting, other. Sintering processing materials are ferrite, aluminum nickel cobalt, samarium cobalt and neodymium iron boron. The material for casting processing is Alnico. The bonding process can be divided into calendering, extrusion, injection molding, and molding. The materials for molding are NdFeB, samarium cobalt, ferrite, and samarium iron nitrogen; the materials for calendering and extrusion are ferrite, NdFeB, samarium iron nitrogen; injection molding materials are NdFeB, samarium ferrite, cobalt, and samarium iron nitrogen. Other processed materials are copper-nickel-iron permanent magnet alloy, iron-cobalt-vanadium permanent magnet alloy, iron-chromium-cobalt permanent magnet alloy, etc.
The testing items of permanent magnet products mainly include four parameters of surface magnetism (maximum, center point, surface magnetic field distribution), magnetic flux, magnetic moment, magnetic declination angle and material. Its testing instrument for the application: the surface magnetic has.
Gaussiometer, Teslar meter, magnetic field distribution tester.
Permanent magnet products commonly used magnetic performance measuring instruments and equipment (1) above for portable handheld gauss meter.
Magnetic performance measuring instruments and equipment commonly used in permanent magnet products (1) desktop gaussmeter on the map.
Multi-pole rings can be tested, and the results include the peak, angle, area, width, and full width at half maximum for each pole. Displays the maximum, minimum and average values of the magnetic field peaks for each pole.
The instruments for measuring the magnetic flux of permanent magnet products are
magnetic flux meterIntegrating coil and test tooling, Helmholtz coil. The magnetic flux of the permanent magnet was measured by the Cedar method. The magnetic moment of the permanent magnet was measured with a Helmholtz coil. Use closed-circuit tooling to test the overall magnetic flux of the motor stator and rotor. Flux coil with a fluxmeter to detect permanent magnets usually use the "pull method", the magnetized sample with a magnetic flux coil using this method is intuitive and effective, in the magnetic flux measurement is a classic measurement method. Another good measurement technique is to rotate the sample 180 degrees without removing the sample, so that the magnetic flux voltage will be twice the original.
FE-210B high precision magnetic flux meter
Helmholtz coil(Helmholtz) can be used for open-circuit sample flux measurement. The measured magnet is removed from the center of the coil, the magnetic flux in the Helmholtz coil changes and the induced voltage generated in the coil is uploaded to the digital fluxmeter, which obtains the flux change through data processing, thus solving the problem of inaccurate measurement of small samples with Hall components.
Helmholtz coil(Helmholtz) is composed of two identical thin parallel coils, the distance between the two coils is equal to the radius of the coil, and the signals of the two coils are connected in series. The frame and support system of the coil must be non-metallic, and the radius of the coil is selected to be at least 2.5 times the maximum sample to be measured. This restriction can make all the samples in the uniform area of the coil. The number of turns of the coil is generally 100 turns or more. A Helmholtz (Helmholtz) coil is used for open-circuit sample flux measurement. Measurements should be made away from areas with magnetic interference, such as other magnets, transformers, or fluorescent sources.
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