Ring magnet and method of manufacturing the magnet
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United States of America Patent
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Jun 23, 2009
Grant Date -
Jul 20, 2006
app pub date -
Oct 29, 2003
filing date -
Feb 27, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Radially oriented ring-shaped preliminarily molded pieces of a ring magnet are stacked in an axial direction to form a ring-shaped molded body, in which end faces of the ring-shaped preliminarily molded pieces are bonded together. This ring-shaped molded body is sintered and heat-treated to produce the ring magnet. Ring magnets which are less susceptible to deterioration of magnetic properties due to a disturbance of magnetic orientation near lamination boundary surfaces are produced. The invention provides a method of manufacturing such ring magnets with high efficiency.
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