Rotor magnet, motor and stepping motor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 31, 2005
Grant Date -
Sep 27, 2001
app pub date -
Jan 23, 2001
filing date -
Mar 24, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To provide a rotor magnet which is small in size and provided with high magnetic energy, a rotor magnet is formed by adding a SmFeN magnetic powder to a binder such as a polyaxnide. The SmFeN magnetic powder is provided in a size of about one-tenth that of an NdFeB magnetic powder. Therefore, the density of the magnetic powder in the magnet can be made uniform. Accordingly, there is not any dispersion of the magnetic poles when a number of poles are magnetized and the magnet can be made smaller since the maximum energy product of the magnet is higher than that of an SmCo series magnet.
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