Ningbo Beyond Magnet Co., Ltd
+86 18967864428 / +86-17706613572

Permanent magnet, NdFeB magnet, Rare earth magnet, Pot magnet, Rubber magnet and more……

We are not only supply customized magnets and magnetic assembly as per particular requirements, but also would love to get involved in design and technical support through whole project lifetime, we are the reliable magnetic solutions partner.

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      • 1. The plating of sintered NdFeB magnets.
      • 2. Introduction of rare earth elements
      • 3. Why powder size and oxygen content have to be controlled
      • 4. What is LD ratio
      • 5. Advantages of NdFeB magnet
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      • 9. Introduction of sintering Nd-Fe-B related parameters
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      • 13. Mainly consider the following to select sintered NdFeB magnets
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      • 21. What is HD strip
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4. What is LD ratio
L/D is a ratio to analyze the shape of a magnet, and it is a very important parameter to judge the temperature resistance ability of the magnet basically.

Normally, we advise L/D ratio＞0.5 (≥0.7 will be even better )

L/D ratio was calculated as follow:

（1） e g, D10*6 disc magnet, magnetized direction is 6, its L/D ratio： 6/10 = 0.6, it has a good L/D ratio, it would stand the high temperature as we designed.

（2） e g, 15*15*3 block magnet, magnetized direction is 3, its L/D ratio: 3 /（2* = 3 / 16.92 = 0.17, L/D ratio is very low，so it would not stand the high temperature as we designed, we have to revise something to improve it.

For more details, please consult our professional engineers.
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Ningbo Beyond Magnet Co., Ltd
Luao Industrial Park, Hengjie town, Haishu District,, Ningbo, PC315181, CHINA 315181 Ningbo China
+86-574-56114004
+86 18967864428 / +86-17706613572
info@bymagnets.com
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