Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor
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United States of America Patent
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May 24, 2011
Grant Date -
Jan 28, 2010
app pub date -
Oct 6, 2009
filing date -
Oct 31, 2001
priority date (Note) -
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Abstract
A radial anisotropic sintered magnet formed into a cylindrical shape includes a portion oriented in directions tilted at an angle of 30° or more from radial directions, the portion being contained in the magnet at a volume ratio in a range of 2% or more and 50% or less, and a portion oriented in radial directions or in directions tilted at an angle less than 30° from radial directions, the portion being the rest of the total volume of the magnet. The radial anisotropic sintered magnet has excellent magnet characteristics without occurrence of cracks in the steps of sintering and cooling for aging, even if the magnet has a shape of a small ratio between an inner diameter and an outer diameter.
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