Permanent magnet segment for use with a BLDC motor assembly
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United States of America Patent
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Mar 24, 2015
Grant Date -
Jan 3, 2013
app pub date -
Sep 14, 2012
filing date -
May 9, 2007
priority date (Note) -
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Abstract
A BLDC electric motor assembly (24) includes a rotor (42) having a plurality of magnet segments (50) securely retained thereabout by an annular ring (68) which is shrunk in situ in an electromagnetic forming operation. The magnet segments (50) are formed with tongues (62, 64) on their upper and lower ends (56, 58). One tongue (64) seats in a retaining pocket (48) molded on the rotor shaft (40), whereas the other tongue (62) provides a ledge into which the ring (68) seats. After the magnet forming operation, wherein the ring (68) is shrunk, the outer surface of the ring (68) is flush with the outer surfaces (54) of the magnet segments (50).
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