US 12,341,399 B2
Motor with a stepped rotating body
Hitoshi Iwata, Nagano (JP); Naoki Ohsawa, Nagano (JP); Shoma Yamanishi, Nagano (JP); Toshiyuki Nishikata, Nagano (JP); Seiji Mitamura, Nagano (JP); Michihiro Shimizu, Nagano (JP); and Yuta Amagi, Nagano (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Appl. No. 17/595,517
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
PCT Filed May 29, 2020, PCT No. PCT/JP2020/021484
§ 371(c)(1), (2) Date Nov. 18, 2021,
PCT Pub. No. WO2020/241887, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-103237 (JP), filed on May 31, 2019.
Prior Publication US 2022/0200392 A1, Jun. 23, 2022
Int. Cl. H02K 5/173 (2006.01); H02K 7/08 (2006.01); H02K 21/22 (2006.01)
CPC H02K 5/1732 (2013.01) [H02K 7/083 (2013.01); H02K 21/22 (2013.01); H02K 2207/03 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A motor comprising:
an axial member;
a tubular rotating body rotatable in relation to the axial member;
a first bearing supporting a first part of the rotating body with respect to the axial member; a second bearing supporting a second part of the rotating body with respect to the axial member;
a stator inside the rotating body; and
a magnet fixed at a third part of the rotating body; wherein
the stator is fixed at the axial member,
a radial dimension of the first bearing and a radial dimension of the second bearing are larger than a radial dimension of the magnet,
an outer surface of the rotating body includes
a first stepped part between an outer surface of the third part of the rotating body and an outer surface of the first part of the rotating body in an axial direction of the axial member, and
a second stepped part between the outer surface of the third part of the rotating body and an outer surface of the second part of the rotating body in the axial direction of the axial member, and
a radial dimension of the outer surface of the third part of the rotating body is smaller than a radial dimension of the outer surface of the first part of the rotating body and a radial dimension of the outer surface of the second part of the rotating body.