Rotating electrical machine
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United States of America Patent
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Apr 3, 2018
Issued Date -
N/A
app pub date -
Apr 22, 2013
filing date -
Apr 22, 2013
priority date (Note) -
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Abstract
According to an electric motor, a cooling hole is formed outside of a circular arc-like region having an intersection between extension lines from inner side surfaces of adjacent permanent magnets as a center of the circular arc-like region and a distance between the intersection and an intermediate point on the side surface of the permanent magnet as a radius of the circular arc-like region. Thus, heat generation by a magnetic resistance due to the cooling hole is suppressed to improve efficiency.
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