Permanent magnet rotor for brushless D.C. motor
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United States of America Patent
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N/A
Issued Date -
Jan 6, 2005
app pub date -
Jul 1, 2003
filing date -
Jul 1, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A permanent magnet rotor for a dc brushless motor generally comprised of a non-insulated shaft and and a permanent magnet is formed in one embodiment by compacting a powdered permanent magnet material substantially about a non-insulated shaft of relatively incompressible material utilizing dynamic magnetic compaction (DMC) techniques. In other embodiements, the rotor is comprised of a non-insulated shaft, a magnetic core and a permanent magnet and is formed by first compacting a powdered core material substantially about the non-insulated shaft of relatively incompressible material to form a magnetic core and then compacting a powdered permanent magnet material substantially about the core to form a permanent magnet, with the compaction of the powdered materials occurring by DMC. Other embodiments may be formed by simultaneously compacting a powdered core material and a powdered permanent magnet material about a non-insulated shaft of relatively incompressible material utilizing DMC techniques.
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