US 12,081,088 B2
Axial-gap-dynamoelectric machine
Takayuki Kobayashi, Shizuoka (JP); Hirotaka Kurita, Shizuoka (JP); Tatsuya Hagiwara, Shizuoka (JP); and Takumi Sugimura, Shizuoka (JP)
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed by YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed on Jul. 7, 2022, as Appl. No. 17/859,412.
Application 17/859,412 is a continuation in part of application No. PCT/JP2020/047363, filed on Dec. 18, 2020.
Claims priority of provisional application 62/961,130, filed on Jan. 14, 2020.
Prior Publication US 2022/0352777 A1, Nov. 3, 2022
Int. Cl. H02K 1/2793 (2022.01); H02K 1/16 (2006.01); H02K 1/2713 (2022.01); H02K 3/12 (2006.01); H02K 3/34 (2006.01); H02K 21/24 (2006.01); H02K 29/03 (2006.01)
CPC H02K 29/03 (2013.01) [H02K 1/16 (2013.01); H02K 1/2713 (2013.01); H02K 1/2793 (2013.01); H02K 3/12 (2013.01); H02K 3/34 (2013.01); H02K 21/24 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An axial-gap-dynamoelectric machine comprising:
a rotor rotatable about a rotation axis, the rotor including a plurality of field magnets arranged around the rotation axis;
a cylindrical stator core, aligned with the rotor in an axial direction of the stator core, such that the rotation axis of the rotor is in the axial direction, the stator core including
a base yoke, and
a plurality of teeth formed of pressed particles and arranged along a circumferential direction of the stator core around the base yoke;
a plurality of resin bobbins, respectively for the plurality of teeth to be individually inserted therein; and
a plurality of stator coils respectively wound around the plurality of resin bobbins, wherein
each of the plurality of resin bobbins includes
a side surface,
a bottom surface, and
a positioning protrusion protruding from the side surface in the axial direction of the stator core;
the base yoke includes
a plurality of tooth holes respectively for the plurality of teeth to be individually inserted therein, and
a plurality of positioning holes respectively located outward or inward of the plurality of tooth holes in a radial direction of the stator core, and configured for the plurality of positioning protrusions to be respectively inserted therein;
in a view of the stator core in the axial direction,
each of the plurality of tooth holes extends along the radial direction, and has
a tooth-hole-radial-direction-outer-end surface located at an outer end of said each tooth hole in the radial direction, and
a tooth-hole-radial-direction-inner-end surface located at an inner end of said each tooth hole in the radial direction,
a circumferential length of the tooth-hole-radial-direction-outer-end surface being larger than a circumferential length of the tooth-hole-radial-direction-inner-end surface, and
each of the plurality of teeth extends along the radial direction, and has a columnar shape including
a tooth-radial-direction-outer-end portion located at an outer end of said each tooth in the radial direction, and
a tooth-radial-direction-inner-end portion located at an inner end of said each tooth in the radial direction,
a circumferential length of the tooth-radial-direction-outer-end portion being larger than a circumferential length of the tooth-radial-direction-inner-end portion; and
in a state where the plurality of positioning protrusions is respectively inserted in the plurality of positioning holes, the plurality of positioning protrusions respectively press the plurality of teeth against the base yoke inward in the radial direction of the stator core, such that, for each of the plurality of teeth inserted in a corresponding one of the plurality of tooth holes,
the tooth-radial-direction-inner-end portion of said each tooth is in contact with the tooth-hole-radial-direction-inner-end surface of said corresponding one tooth hole,
a tooth-circumferential-direction-end portion located at an end of said each tooth in the circumferential direction of the stator core is in contact with a tooth-hole-circumferential-direction-end surface located at an end of said corresponding one tooth hole in the circumferential direction of the stator core, and
the tooth-radial-direction-outer-end portion of said each tooth is not in contact with the tooth-hole-radial-direction-outer-end surface of said corresponding one tooth hole.