US 11,735,963 B2
Polygonal frame structure with armature core with connected and open core sheets inside the frame
Manabu Horiuchi, Tokyo (JP); Yasushi Misawa, Tokyo (JP); Jun Kitajima, Tokyo (JP); and Mai Shimizu, Tokyo (JP)
Assigned to SANYO DENKI CO., LTD., Tokyo (JP)
Filed by SANYO DENKI CO., LTD., Tokyo (JP)
Filed on Dec. 16, 2020, as Appl. No. 17/123,681.
Claims priority of application No. 2019-235835 (JP), filed on Dec. 26, 2019.
Prior Publication US 2021/0203198 A1, Jul. 1, 2021
Int. Cl. H02K 1/18 (2006.01); H02K 15/12 (2006.01); H02K 29/03 (2006.01)
CPC H02K 1/185 (2013.01) [H02K 15/12 (2013.01); H02K 29/03 (2013.01); H02K 2213/03 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A frame structure of a motor, comprising:
a frame including a polygonal outer periphery, and a circular inner periphery; and
an armature core to be inserted into the inner periphery of the frame, wherein
the armature core includes a plurality of first core sheets stacked on top of each other, or a plurality of the first core sheets and second core sheets, which are stacked on top of each other,
in the first core sheet, distal end portions of adjacent magnetic poles on a rotation axis side of the frame are coupled by bridges,
in the second core sheet, openings are formed between the distal end portions of the adjacent magnetic poles on the rotation axis side without coupling the distal end portions,
the number of angles of the polygon of the outer periphery of the frame is defined on the basis of the number of peaks of the thickness of the frame in cross section as viewed in a radial direction from the rotation axis of the frame,
the armature core is inserted into the frame in such a manner as to form a variation θ within a predetermined range in a circumferential direction between a reference line that is orthogonal to two opposing sides of the frame and passes through the rotation axis, and a straight line linking magnetic poles symmetric about a point with respect to the rotation axis, assuming that the number of angles of the frame is 4M where M is a natural number and M≥1, and the number of slots of the armature core is 6N where N is a natural number and N≥1 and
the variation θ is an angle θ1 determined by the following equation:

OG Complex Work Unit Math
where a case of M=1 and N=1 is excluded.