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This is a round hole magnet with an outer diameter of 70mm, an inner diameter of 32mm, and a thickness of 15mm. The material is sintered ferrite, anisotropic, and the surface is uncoated. It is mainly used for speakers, speakers, and thickness magnetization.
At present, the magnets on the speakers mainly include sintered neodymium magnets and ceramic ferrite magnets. The magnetic properties of ferrites are relatively poor, and a certain volume is required to meet the driving force of the speakers, so they are generally used in larger audio speakers.
Rare earth magnetic materials (such as NdFeB), the magnetizing flux is much larger than that of ferrite, so using NdFeB magnets does not require a large diameter, so NdFeB is mostly used for small volume speakers, such as automobiles Audio.
For the same magnetic material, the larger the diameter, the saturation of magnetization, the greater the magnetic field strength, the greater the power of the speaker, the higher the sensitivity of the speaker, and the better the transient response.
Speaker magnets of other sizes;
Ferrite grade, sintered ferrite magnetic property parameter table
NdFeB magnet grade, Sintered neodymium magnet performance grade parameter table
Neodymium(Ndfeb) Magnet Material Safety Data Sheet
Sintered Ferrite Material Safety Data Sheet Pdf
Magnetic properties grade parameters of smco rare earth magnets
This product is a ring ferrite magnet with an outer diameter of 13.5mm, an inner diameter of 10mm, and a thickness of 4mm. The grade is Y10, the surface magnetic field strength is about 650 Gauss, and the magnetism is not very strong....
This product is a ferrite block magnet with a length of 50mm, the N pole is marked, and the surface is gray, Around 1100 Gauss, The specific size is 50mm in length, 5mm in width and 5mm in height. This material is cheap and high temperature resistant, and the size can be processed according to your needs. Magnetization...
This product is a very small ferrite cylindrical magnet, radially magnetized, with a diameter of only 1.4mm, a thickness of 3.4mm, and a surface magnetic field strength of 300-350 Gauss. Have you ever seen such a small ferrite magnet?...
This is a round ferrite magnet with a square sink hole, which is different from most of the sink hole magnets. If you are interested in this type of magnet, you can contact the website customer service....
This is a circular ferrite magnet for electronic firecrackers. Performance: Y30BH Chinese standard, C8 American standard, HF28/26 European standard, The size is 8mm in diameter, 5mm in thickness, plus or minus 0.05mm in diameter, strong magnetic surface N pole, with concave mark,...
To buy round ferrite magnets, welcome to contact Courage permanent magnet manufacturers in China, our company has many sizes of ceramic round, block, arc, hole ferrite magnets, factory direct sales, low price, welcome Inquiries from customers all over the world....
Introduction of anisotropic diameter 20 thickness 20mm ferrite，Supplier: Courage Magnet，Magnet grade: Y30BH，Magnetization: yes，Coating: No coating required，Packaging: Magnetically isolated packaging，Place of Origin: Mainland China...
This is a large round ferrite magnet with a performance class of C10, normal axial magnetization, the size of the magnet is 72mm (2.83 inches) in outer diameter and 15mm in thickness, with strong magnetic properties, operating temperature -40 to 250 ℃ , The delivery time is 7-20 days, suitable for industry, machinery and equipment....