BRUSHLESS MOTOR

WIPO Patent Application WO/2017/002873

A1

Provided is a brushless motor in which a rotor comprises a plurality of segmented permanent magnets (7) that are each formed on the outer circumference of a rotating shaft so as to have a fan shape in an axial cross section, that are magnetized from the inner radial surface toward the outer radial surface thereof, and that are arranged at even intervals so the magnetic poles of the outer radial surfaces are disposed in an alternating manner with respect to the polarities thereof along the circumferential direction. The outer radial surface (71) of each of the permanent magnets (7) comprises a center of curvature (TR2) on a line segment (TL) connecting a center point (TP) in the circumferential width on the outer radial surface (71) with the axial center (L1) of the rotating shaft, and said outer radial surface (71) is formed as a cylindrical surface having a radius of curvature (R2) smaller than the distance of the segment (TL) connecting the center point (TP) in the circumferential width on the outer radial surface (71) with the axial center (L1) of the rotating shaft. Each of the permanent magnets (7) is magnetized in parallel orientation so that the orientation of magnetized magnetic flux is parallel to the segment (TL) connecting the center point (TP) in the circumferential width on the outer radial surface (71) with the axial center (L1) of the rotating shaft.

OHORI RYO (JP)
SHIODA NAOKI (JP)

PCT/JP2016/069314

January 05, 2017

June 29, 2016

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MITSUBA CORP (JP)

H02K1/27; H02K21/14; H02K29/03

JP2002262533A	2002-09-13
JP2001045682A	2001-02-16
JP2005253146A	2005-09-15
JP5714189B2	2015-05-07
JP2001275285A	2001-10-05
JPH08111968A	1996-04-30

SHIGA Masatake et al. (JP)

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