SINTERED MAGNET, ELECTRICAL MACHINE, USE OF THE SINTERED MAGNET FOR AN ELECTRICAL MACHINE AND MANUFACTURING METHOD OF A SINTERED MAGNET
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United States of America Patent
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Issued Date -
Oct 10, 2019
app pub date -
Jun 24, 2019
filing date -
Dec 23, 2016
priority date (Note) -
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Abstract
A sintered magnet, the sintered magnet including a core portion, a shell portion arranged at an outer part of the sintered magnet, and a diffusion portion arranged at least partially between the core portion and the shell portion. The shell portion has a coercivity, which is at least 30 kA/m larger than the coercivity of the core portion. In the diffusion portion, the coercivity is not less than the coercivity of the core portion and not larger than the coercivity of the shell portion and the value of the coercivity gradually increases from the core portion towards the shell portion. The thickness of the core portion is not less than 1 mm and the total thickness of the shell portion and the diffusion portion is at least 5 mm.
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