BH Curve of NdFeB Magnet, Grade N50
2

Question

BH Curve of NdFeB Magnet, Grade N50

IssamBM (Mechanical)

(OP)

15 Feb 15 15:38

Every magnet manufacturer provides his own BH-demagnetazation curve of the Neodymium Iron Boron (NdFeB) permanent magnet, grade N50, differently from other manufacturers.

Is there a trusted literature source or reference (material handbook) where one can find the BH-demagnetazation curve of reference of the Neodymium Iron Boron (NdFeB) permanent magnet, grade N50?

MagMike (Materials) · Answer 1 · 2015-02-16 12:57:10

No. Organizations such as ASTM and IEC only publish minimum specifications for selected magnetic properties such Br and Hci, since these are usually the only specifications that a magnet supplier will guarantee.

The reality is the BH curve of any magnet material (not just N50) will vary from batch to batch, so determining a 'reference' BH curve isn't practical. Guaranteeing minimum magnetic properties is much more feasible and accepted in the industry.

When I design a magnet circuit, I design to minimum specifications of Br and Hci. Except for unusual applications, this is sufficient.

Since this is the 2nd time you asked this type of question, it must be important to you. If that is the case, I suggest you take all the N50 curves from the various suppliers you have contacted and average them together. This will approximate a reference curve for your own applications.

israelkk (Aerospace) · Answer 2 · 2015-03-17 05:29:42

try,

MMPA STANDARD No. 0100-00 STANDARD SPECIFICATIONS FOR PERMANENT MAGNET MATERIALS,

available here

http://www.intemag.com/pdf/MMPA0100-00.pdf

israelkk (Aerospace) · Answer 3 · 2015-03-17 05:34:50

Try too,

MMPA PMG-88 Permanent Magnet Guidelines

Available here,

http://www.intemag.com/pdf/MMPAPMG-88.pdf

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BH Curve of NdFeB Magnet, Grade N50
2