Rotor of permanent-magnet embedded motor, and compressor, blower, and refrigerating/air conditioning device using the rotor
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
Dec 26, 2011
filing date -
Dec 26, 2011
priority date (Note) -
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Abstract
A rotor of a permanent-magnet embedded motor includes a rotor core having magnet insertion holes along a circumferential direction and a magnet inserted into each of the holes, wherein a gap is formed at opposite ends of a hole at a time of inserting the magnet therein, an outer peripheral face of the core is formed by a first curved surface formed from a magnetic pole center to between poles, with a radial distance from a shaft center of the core being largest at the pole center on the peripheral face, and a second curved surface formed from an interpolar portion toward the pole center to intersect with the first curved surface, with the radial distance from the shaft center being smallest in the interpolar portion on the peripheral face, and wherein a length of the first curved surface is larger than a length of the second curved surface.
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