Three-phase electric motor with a low detent torque
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United States of America Patent
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Dec 6, 2016
Grant Date -
May 3, 2012
app pub date -
May 11, 2010
filing date -
May 11, 2009
priority date (Note) -
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Abstract
The disclosure relates to a three-phase electric motor that uses high magnetic energy permanent magnets and that has a low detent torque. The motor consists of a rotor with N pairs of poles and of a stator portion with teeth extending radially from an annular gear. The teeth have windings and the ends thereof comprise an arc of circle, the middle of which is located on a radius R1 and two sides defining an alpha angle, the vertex of which is located on a radius R2. The ratio R2/R1 is substantially equal to (1+/−0.26/N), and the alpha angle is between 110 and 135°.
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