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Temperature stability of NdFeb permanent magnet
Gauss Industrial Co.,Ltd | Updated: Dec 01, 2018

Wind turbines work in the wilderness, enduring extreme heat and cold; At the same time motor loss also causes motor temperature rise. The table above gives sintered ndfeb magnets can work under 120 ℃.
Nd-fe-b alloy Curie temperature about 310 ℃, when the temperature of the magnet over the Curie point, it's from ferromagnetism to paramagnetism. Below the Curie temperature, summary of remanence decreases with temperature rise, and its residual magnetism temperature coefficient alpha (Br) is 0.095 ~ 0.105% / ℃. Summary of coercive force decreases with the rise of temperature, and also the temperature coefficient of the coercive force (jHc) of 0.54 ~ 0.64% / ℃. Select the appropriate coercivity, at the highest operating temperature of motor design, the magnet still has enough coercivity; Otherwise, magnetic loss will occur.
Ndfeb permanent magnetic material remanence and coercivity are complementary. Adding dysprosium (Dy) and terbium (Tb) to the alloy can significantly improve the coercivity of magnets. With the increase of coercivity, the remanence and maximum magnetic energy products decrease correspondingly. Obviously, the selection of high coercivity magnetic steel for wind turbines must be at the cost of remanence and maximum magnetic energy product.

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