US 11,990,807 B2
Electric rotating machine
Hironori Tsuiki, Tokyo (JP); and Jumpei Yasutomi, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Feb. 22, 2022, as Appl. No. 17/677,423.
Claims priority of application No. 2021-163245 (JP), filed on Oct. 4, 2021.
Prior Publication US 2023/0108657 A1, Apr. 6, 2023
Int. Cl. H02K 3/14 (2006.01)
CPC H02K 3/14 (2013.01) 4 Claims
OG exemplary drawing
 
1. An electric rotating machine comprising:
an armature iron core provided with two or more teeth arranged in a ring-shaped manner and with a ring-shaped yoke for connecting the two or more teeth;
an armature coil mounted on the armature iron core; and
a rotor that has a magnetic-field pole and whose outer circumferential portion faces an inner circumference portion of the armature iron core through an air gap,
wherein the armature coil includes two or more armature-coil elements whose cross sections are each formed in a rectangular shape,
wherein the armature-coil element has
a first coil conductor portion and a second coil conductor portion that are contained, at a predetermined pitch, in respective slots formed between the teeth that are adjacent to each other, and
a coil end portion that connects the first coil conductor portion with the second coil conductor portion and that is disposed at an axis-direction end portion of the armature iron core,
wherein the coil end portion has
a crank portion that is provided in an apex portion of the coil end portion and is displaced in a radial direction of the armature iron core,
a first oblique side that connects the first coil conductor portion with the crank portion and slants with respect to an axis-direction endface of the armature iron core, and
a second oblique side that connects the second coil conductor portion with the crank portion and slants with respect to the axis-direction endface of the armature iron core, and
wherein at least one of the first oblique side and the second oblique side has an inflection point, before being connected with the crank portion, that functions as a base point of a bending portion that is bent toward a radially outside of the armature iron core,
wherein the bending portion includes
a bending portion ranging from the first coil conductor portion or the second coil conductor portion to the inflection point, and
a bending portion ranging from the inflection point to the crank portion, and
wherein a curvature of the bending portion ranging from the first coil conductor portion or the second coil conductor portion to the inflection point and a curvature of the bending portion ranging from the inflection point to the crank portion are formed to be different from each other.