Rotating electrical machine and producing method of rotating electrical machine

Patent metadata

Field	Value
Publication number	US-2018342913-A1
Application number	US-201816052620-A
Country	US
Kind code	A1
Filing date	Aug 2, 2018
Priority date	Feb 29, 2016
Publication date	Nov 29, 2018
Grant date	—

Abstract

A rotating electrical machine includes a frame, and a stator core fixed to an inner peripheral surface of the frame and including a plurality of split cores disposed in a peripheral direction. Each of the plurality of split cores includes a groove disposed along an axial direction on a central position in the peripheral direction on an outer peripheral surface of the split core, and a first protrusion disposed on a bottom of the groove and protruding outward in a radial direction.

First claim

What is claimed is:

1 . A rotating electrical machine, comprising:
a frame; and a stator core fixed to an inner peripheral surface of the frame and comprising a plurality of split cores disposed in a peripheral direction, each of the plurality of split cores comprising:
a groove disposed along an axial direction on a central position in the peripheral direction on an outer peripheral surface of the split core; and
a first protrusion disposed on a bottom of the groove and protruding outward in a radial direction.

2 . The rotating electrical machine according to claim 1 ,
wherein the groove comprises two side surfaces facing each other in the peripheral direction, and wherein a groove width between the two side surfaces in the peripheral direction decreases inward in the radial direction.

3 . The rotating electrical machine according to claim 2 ,
wherein the groove comprises two second protrusions contacting the inner peripheral surface of the frame and protruding in a mutually approaching direction from an outer end portion of each of the two side surfaces in the radial direction.

4 . The rotating electrical machine according to claim 3 ,
wherein the groove comprises two first notches respectively disposed between the first protrusion and the two side surfaces, and wherein each of the two first notches is formed to be an acute angle.

5 . The rotating electrical machine according to claim 4 ,
wherein the groove comprises two second notches respectively disposed between the two side surfaces and the two second protrusions, and wherein each of the two second notches is formed to be an acute angle.

6 . The rotating electrical machine according to claim 5 ,
wherein the split core is formed by laminating a plurality of steel sheets, wherein cross sectional shapes of the first notch and the second notch perpendicular to the axial direction are chamfered into an arc shape, wherein a radius of curvature of the first notch is smaller than a plate thickness of the steel sheet, and wherein a radius of curvature of the second notch is larger than the plate thickness of the steel sheet.

7 . The rotating electrical machine according to claim 2 ,
wherein the split core comprises two contact surfaces respectively being in contact with adjoining two split cores on end portions of both sides in the peripheral direction, and wherein the side surface is disposed such that a normal perpendicular to the side surface passes vicinity of an inner end portion of the contact surface in the radial direction.

8 . The rotating electrical machine according to claim 3 ,
wherein the split core comprises two contact surfaces respectively being in contact with adjoining two split cores on end portions of both sides in the peripheral direction, and wherein the side surface is disposed such that a normal perpendicular to the side surface passes vicinity of an inner end portion of the contact surface in the radial direction.

9 . The rotating electrical machine according to claim 4 ,
wherein the split core comprises two contact surfaces respectively being in contact with adjoining two split cores on end portions of both sides in the peripheral direction, and wherein the side surface is disposed such that a normal perpendicular to the side surface passes vicinity of an inner end portion of the contact surface in the radial direction.

10 . The rotating electrical machine according to claim 5 ,
wherein the split core comprises two contact surfaces respectively being in contact with adjoining two split cores on end portions of both sides in the peripheral direction, and wherein the side surface is disposed such that a normal perpendicular to the side surface passes vicinity of an inner end portion of the contact surface in the radial direction.

11 . The rotating electrical machine according to claim 6 ,
wherein the split core comprises two contact surfaces respectively being in contact with adjoining two split cores on end portions of both sides in the peripheral direction, and wherein the side surface is disposed such that a normal perpendicular to the side surface passes vicinity of an inner end portion of the contact surface in the radial direction.

12 . A producing method of a rotating electrical machine comprising a stator core including a plurality of split cores, each of the plurality of split cores comprising a groove disposed along an axial direction on an outer peripheral surface of the split core, and a first protrusion disposed on a bottom of the groove and protruding outward in a radial direction, the producing method comprising:
forming the stator core by disposing the plurality of split cores to connect in a peripheral direction; and fixing a frame to an outside of the stator core by shrink fit.

Assignees

• Yaskawa Electric Corp

Inventors

• Suzuki Takeo
• Hirata Kenichi
• Koga Hiroshi
• Ohto Motomichi
• SHIROZU Yosuke

Classifications

• H02K15/022

  with salient poles · CPC title

• H02K1/185

  to outer stators · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K5/00

  Casings; Enclosures; Supports · CPC title

• H02K1/14 Primary

  Stator cores with salient poles · CPC title