WO2014136145A1

WO2014136145A1 - Stator core of rotating machine, rotating machine and method for manufacturing same

Info

Publication number: WO2014136145A1
Application number: PCT/JP2013/001496
Authority: WO
Inventors: 健太郎堀坂; 興起仲; 信一山口; 雅哉原川; 和秋安藤; 健太尾崎
Original assignee: 三菱電機株式会社
Priority date: 2013-03-08
Filing date: 2013-03-08
Publication date: 2014-09-12

Abstract

The purpose of the present invention is to solve a problem pertaining to the stator core of a conventional motor, generator and so forth, that is, a problem of the increase in loss of the stator core split into two parts, a tooth-side core and a core back-side core, caused by the increase in magnetic resistance due to the cutout and the gap in the core back-side core which are provided to bend the linear stator core into an annular shape. The split section where the tooth-side core (101a) and the core back-side core (102a) fit each other has a perimeter longer than the outer peripheral perimeter of the stator core (100).

Description

Stator core of rotating electrical machine, rotating electrical machine, and manufacturing method thereof

The present invention relates to a stator iron core of a rotating electrical machine, a rotating electrical machine, and a manufacturing method thereof.

A conventional stator iron core of a rotating electric machine such as an electric motor or a generator uses a stator iron core punched in a straight line and is bent into an annular shape in order to improve the space factor and productivity of the stator winding. Further, the loss of the stator core is reduced by using a directional electrical steel sheet in which the linear stator iron core is divided into two portions on the teeth side and the core back side, and the respective magnetic flux directions and the easy magnetization directions are matched.

For example, the core back material constituting the core back side divided into two is provided with a fitting portion where the base end portion of the teeth is fitted to one long side of the band-shaped grain-oriented electrical steel sheet whose longitudinal direction is the direction of easy magnetization. The number of teeth is equal to the number of teeth, and has a notch with a taper from the back end of the fitting portion toward the other long side of the band-shaped directional steel plate, and is connected by a thin-walled bent portion. , Stamped and formed. The bent part is thin and short enough to be bent into an annular shape with a slight processing force, and a substantially elliptical gap between the tip of the notch and the bent part is easy to bend. Is formed. Also, when the core back material is bent into an annular shape by bending the notch side inward until both ends are joined inside, the notch part is joined without a gap, and the fitting part is not spaced from the base end part of the tooth. It has a shape to be combined.

On the other hand, the tooth material constituting the tooth side divided into two parts is a base end part where one end part is a joint part with the fitting part of the core back, and the other end part is a tooth expansion part facing the rotor. The teeth are arranged so that the leg portions of the teeth, which are formed between the base end portion and the tooth expansion portion, are arranged in the width direction of the band-shaped directional electrical steel sheet whose longitudinal direction is the direction of easy magnetization. The end of the tooth expansion part of the matching teeth is connected by a thin part and punched. The thin portion is formed thin and short enough to be bent into an annular shape with a slight processing force. Further, the band-shaped tooth material is bent into an annular shape so that both ends are joined with the side on which the teeth are provided being outside to form a teeth sheet, and a laminated tooth body is formed by laminating to form an inner core. The laminated core back body forming the outer core and the laminated tooth body forming the inner core are coupled and fixed at the fitting portion and the base end portion to form the stator core of the rotating electrical machine (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-271716 (page 11, FIG. 1)

A conventional stator of a rotating electric machine such as an electric motor or a generator is configured as described above. Therefore, in order to bend a linear stator iron core into an annular shape, a core back constituting the core back side of the stator iron core divided into two parts There are notches and voids in the material. As a result, each of the notches and the voids increases the magnetic resistance, which increases the loss of the stator core.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a notch portion of a core back material that constitutes a core back side of a two-part stator core that causes an increase in magnetic resistance. Provided is a stator core that reduces the loss by bending the stator core into an annular shape without providing a gap and suppressing deterioration of the magnetic characteristics of the stator core.

In the stator core of the rotating electrical machine according to the present invention, the stator of the rotating electrical machine formed by fitting the first iron core on the teeth side formed by stacking the steel plates and the second iron core on the core back side formed by stacking the steel plates. An outer periphery of the stator core is longer than an outer periphery of the stator core.

According to the present invention, the loss can be reduced by bending the stator iron core divided into two into an annular shape and suppressing the deterioration of the magnetic characteristics of the stator iron core, so that a highly efficient and low heat generating rotating electrical machine can be realized.

It is sectional drawing perpendicular | vertical to the axial direction of the stator iron core which shows Example 1 of this invention. It is sectional drawing perpendicular | vertical to the axial direction of the iron core by the side of the teeth of the stator iron core divided into 2 which shows Example 1 of this invention. It is sectional drawing perpendicular | vertical to the axial direction of the iron core of the core back side of the stator iron core divided into 2 which shows Example 1 of this invention. It is sectional drawing when the iron core by the side of the teeth which shows Example 1 of this invention is made linear. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a layout view of iron cores for punching out a straight teeth-side iron core showing Embodiment 1 of the present invention. It is sectional drawing when the iron core by the side of a core back which shows Example 1 of this invention is made linear. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a layout diagram of iron cores for punching out a straight core back side iron core according to Embodiment 1 of the present invention. It is sectional drawing perpendicular | vertical to the axial direction of the stator iron core which shows the modification of Example 1 of this invention. It is sectional drawing perpendicular | vertical to the axial direction of the stator iron core which shows the modification of Example 1 of this invention. It is sectional drawing perpendicular | vertical to the axial direction of the stator iron core which shows the modification of Example 1 of this invention. It is detail drawing of the cross section perpendicular | vertical to the axial direction of the stator iron core which shows Example 2 of this invention. It is a figure which shows the circumference dependence of the division part of the magnetoresistive which shows Example 2 of this invention. It is detail drawing of the cross section perpendicular | vertical to the axial direction of the stator core which shows Example 3 of this invention. It is a figure which shows the magnetic flux dependence of the deformation | transformation part which occupies the magnetic flux of the core back part of the loss of a stator iron core which shows Example 3 of this invention.

Example 1.
1 is a cross-sectional view perpendicular to the axial direction of a stator iron core showing Embodiment 1 of the present invention. In FIG. 1, 100 is a stator iron core, 101a is a first iron core on the teeth side, has a plurality of teeth, 102a is a second iron core on the core back side, and the outer circumference of the iron core 101a on the teeth side A plurality of core back pieces to be fitted to the portion. Reference numeral 111 denotes a thin portion of the iron core 101a on the teeth side which is the first thin portion, and reference numeral 112 denotes a thin portion of the core 102a on the core back side which is the second thin portion. In the thin portion 111 and the thin portion 112, the magnetic flux flows in a direction parallel to the circumferential direction of the stator core 100. The stator core 100 is divided into two parts at the core back portion, and is composed of a teeth side iron core 101a and a core back side iron core 102a. The inner peripheral part of the core core 102a on the core back side and the outer peripheral part of the iron core 101a on the teeth side are formed so as to fit together such as press-fitting, adhesion, shrink fitting and the like. The circumferential direction of the stator core 100 is such that the peripheral length of the split portion where the teeth-side iron core 101a and the core-back-side core 102a, which are the split portions of the stator core 100, fit together is longer than the outer peripheral length of the stator core 100. It is formed in a triangular shape.

2 is a cross-sectional view perpendicular to the axial direction of the iron core on the teeth side of the stator core divided into two parts showing Embodiment 1 of the present invention, and FIG. 3 is a core of the stator core divided into two parts showing Embodiment 1 of the present invention. It is sectional drawing perpendicular | vertical to the axial direction of the iron core of a back side. In FIG. 2, the iron core 101a on the teeth side includes the same number of thin portions 111 as the teeth, and is formed in an annular shape. In FIG. 3, the core core 102a on the core back side includes the same number of thin portions 112 as the teeth, and is formed in an annular shape.

Thus, in the first embodiment of the present invention, compared to the case where the stator core 100 is divided into two in a circular shape, the teeth-side iron core 101a and the core-back-side iron core 102a, which are divided portions of the stator core 100, are fitted together. Since the circumferential length of the divided portion is divided into two so as to be longer than the circumferential length of the outer periphery of the stator core 100, the surface area of the circumferential length of the divided portion is one side and the length of the axial stator core 100 is one side. Can be increased. For this reason, the magnetic resistance of the stator core 100 is reduced, and as a result, the loss of the stator core 100 is reduced. Therefore, a highly efficient and low heat generating rotating electrical machine can be realized.

FIG. 4 is a cross-sectional view when the teeth-side iron core showing the first embodiment of the present invention is linearized. In FIG. 4, 101 b is a linear teeth-side iron core before the teeth-side iron core 101 a is bent into an annular shape. The linear iron core 101b shown in FIG. 4 is bent into an annular shape with the teeth at the inner peripheral side at the position of the thin portion 111, thereby forming the iron core 101a on the teeth side. The thickness of the thin portion 111 may be any thickness that can be maintained without breaking and separating the annular shape of the iron core 101a on the teeth side. For example, the thickness of the thin portion 111 is 1/10 (1 / 10).

FIG. 5 is a layout diagram of iron cores for punching out the iron core on the straight teeth side according to the first embodiment of the present invention. The teeth of the iron core 101b on the straight tooth side are arranged and punched so as to fit within the slot of another linear tooth core 101b on the other side of the upside down, thereby improving the yield compared to punching in an annular shape. be able to. Further, in the state of the iron core 101b on the straight tooth side, the winding is wound around each tooth and then bent into an annular shape. Therefore, in the straight state, a space for winding the winding can be increased, Productivity and productivity can be improved. Furthermore, by using a magnetic steel sheet in which the magnetic flux direction of the teeth is aligned with the rolling direction or a directional electromagnetic steel sheet in which the direction of easy magnetization is aligned with the rolling direction, the magnetic properties are improved and the loss of the stator core 100 can be reduced.

FIG. 6 is a cross-sectional view when the core core on the core back side showing the first embodiment of the present invention is linearized. In FIG. 6, reference numeral 102b denotes a linear core back side iron core before the core back side iron core 102a is bent into an annular shape. The core core 102b on the core back side is formed by bending the core core 102b on the linear core back side shown in FIG. 6 into an annular shape at the position of the thin portion 112. The thickness of the thin portion 112 may be any thickness that can be maintained without breaking and separating the annular shape of the core 102a on the core back side. For example, the thickness of the thin portion 112 is 1/10 of the core back portion ( 1/10) in thickness.

FIG. 7 is a layout diagram of iron cores for punching out the iron core on the linear core back side, showing Embodiment 1 of the present invention. The thin core portion 112 of the core core 102b on the straight core back side is arranged and punched out so as to fit in the center of the adjacent thin core portion 112 of the other core core 102b on the straight core back side that is turned upside down. Yield can be improved compared to punching. Further, by using a magnetic steel sheet in which the magnetic flux direction of the core back coincides with the rolling direction or a directional magnetic steel sheet in which the magnetic direction of the core back coincides with the easy magnetization direction, the magnetic characteristics can be improved and the loss of the stator core 100 can be reduced. .

Although the case where the shape of the divided portion of the stator core 100 is triangular has been described with reference to FIG. 1, for example, the same effect can be obtained even if the stator core has a convex shape in the radial direction as shown in FIG. 8. . In FIG. 8, 200 is a stator iron core, 201a is a iron core on the teeth side, 202a is an iron core on the core back side, 211 is a thin part of the iron core 201a on the teeth side, and 212 is a thin part of the iron core 202a on the core back side. The stator iron core 200 is divided into two at the core back portion, and is constituted by a teeth side iron core 201a and a core back side iron core 202a. The shape of the divided portion of the stator core 200 is formed as a convex shape based on the triangular divided portion shown in FIG.

In addition, although the case where the shape of the divided portion of the stator core 100 is a triangular shape has been described with reference to FIG. 1, for example, as shown in FIG. 9, the same is true even if the shape has a plurality of wave shapes in the radial direction of the stator core. The effect of can be obtained. 9, 300 is a stator iron core, 301a is a iron core on the teeth side, 302a is an iron core on the core back side, and 311 is a thin portion of the iron core 301a on the teeth side. The stator iron core 300 is divided into two at the core back portion, and is composed of a teeth side iron core 301a and a core back side iron core 302a. The shape of the divided portion of the stator core 300 forms a plurality of wave shapes on the outer peripheral portion of one tooth of the iron core 301a on the tooth side. The core core 302a on the core back side of the stator iron core 300 does not have a thin portion, and is formed in an annular shape having a wave shape that can be fitted to the iron core 301a on the inner peripheral side.

Further, FIG. 1 illustrates the case where the shape of the divided portion of the stator core 100 is a triangular shape. For example, as illustrated in FIG. 10, the stator core 100 has a triangular shape having a number larger than the number of teeth in the radial direction of the stator core. The same effect can be obtained. In FIG. 10, 400 is a stator iron core, 401a is a teeth side iron core, 402a is a core back side iron core, 411 is a thin portion of the teeth

side iron core

401a, and 412 is a thin portion of the core back side iron core 402a. The stator core 400 is divided into two at the core back portion, and is constituted by a teeth side iron core 401a and a core back side iron core 402a. The shape of the divided portion of the stator core 400 is formed in a triangular shape having a number larger than the number of teeth so that the circumferential length of the divided portion is longer than the circumferential length of the outer periphery of the stator core 400.

As described above, the shape of the divided portion of the stator core 100 is a triangular shape shown in FIG. 1, a convex shape shown in FIG. 8, a plurality of wave shapes shown in FIG. 9, and a triangular shape having a number larger than the number of teeth shown in FIG. The shape is not limited to this, and the peripheral length of the divided portion where the teeth side iron core 101 a and the core back side iron core 102 a are fitted may be longer than the outer circumference of the stator core 100. Further, since the shape of the divided portion of the stator core 100 is not circular, the mating portion of the teeth-side iron core 101a and the core-back-side iron core 102a has an effect of preventing rotation.

A method for manufacturing the stator core 100 will be described. First, as shown in FIG. 5, a plurality of teeth in a single steel plate, a plurality of teeth are connected in a straight line by thin portions 111 perpendicular to the direction in which the magnetic flux flows, and the iron core 101b on the teeth side, FIG. As shown in FIG. 4, core back-side cores 102b, each having a plurality of core back pieces that are connected in a straight line by thin-walled portions 112 in parallel with the direction in which the magnetic flux flows, are punched out. . Next, the iron core 101b on the teeth side and the iron core 102b on the core back side are respectively laminated, and the winding is wound around a plurality of teeth of the iron core 101b on the teeth side. Next, the iron core 101b on the teeth side and the iron core 102b on the core back side are each formed into an annular shape, and the stator core 100 is formed by fitting the laminated core iron core 101a with the laminated core back iron core 102a.

Example 2
Next, Example 2 will be described. In the first embodiment of the present invention, the circumferential length of the divided portion where the teeth-side iron core 101a and the core-back side iron core 102a, which are divided portions of the stator core 100, are longer than the outer circumferential length of the stator core 100. As described above, it is better if the circumferential length of the divided portion of the stator core 100 is in a range of 1.1 to 1.5 times the circumferential length of the average diameter of the divided portion quantitatively. FIG. 11 is a detailed view of a cross section perpendicular to the axial direction of the stator core showing Embodiment 2 of the present invention. In FIG. 11, 20 is the circumference of a division part, 21 is the circumference of the average diameter of a division part.

FIG. 12 is a diagram showing the peripheral length dependence of the divided portion of the magnetoresistance showing the second embodiment of the present invention. In FIG. 12, the vertical axis represents the magnetic resistance of the stator core 100, and the horizontal axis represents the ratio of the peripheral length 20 of the divided portion to the peripheral length 21 of the average diameter of the divided portion, that is, (peripheral length 20 of the divided portion / average of the divided portions). The perimeter of the diameter 21). From the results shown in FIG. 12, the magnetic resistance of the stator core 100 is 1.1 to 1.5 times the value of (peripheral length 20 of the divided portion / periphery length 21 of the average diameter of the divided portion). The magnetoresistance value when the circumference is equal to the circumference of the outer shape of the stator core, that is, the magnetoresistance value of the stator core 100 when the teeth side iron core 101a and the core back side iron core 102a are divided into circular shapes. It turns out that it becomes a low value.

Thus, by setting the peripheral length of the divided portion of the stator core 100 to a range of 1.1 to 1.5 times the peripheral length of the average diameter of the divided portion, the magnetic resistance of the stator core 100 is reduced, and as a result. Since the loss of the stator core 100 is reduced, a highly efficient and low heat generating rotating electrical machine can be realized.

Example 3
Next, Example 3 will be described. FIG. 13 is a detailed view of a cross section perpendicular to the axial direction of the stator core, showing Embodiment 3 of the present invention. In FIG. 13, 30 is a magnetic flux flowing in the circumferential direction through the core-back side iron core 102a on the radially extending line of the thin-

walled portion

111, and 31 is a magnetic flux flowing in the circumferential direction through the thin-walled portion 111 of the teeth-side iron core 101a.

FIG. 14 is a diagram showing the magnetic flux dependence of the deformed portion occupying the magnetic flux of the core back portion of the stator core loss according to the third embodiment of the present invention. In FIG. 14, the vertical axis represents the loss of the stator core 100, and the horizontal axis represents the ratio of the magnetic flux 31 to the sum of the magnetic flux 30 and the magnetic flux 31, that is, (magnetic flux 31 / (magnetic flux 30 + magnetic flux 31)). From the results of FIG. 14, the loss of the stator core 100 is less than 1.1 times the loss of the stator core 100 when the value of (magnetic flux 31 / (magnetic flux 30 + magnetic flux 31)) is 10% or less and there is no bending stress. can do. Since the thin-walled portion 111 and the thin-walled portion 112 are deformed when the linear iron core is bent into a circular shape, stress associated with the bending is applied. Such deformed portions of the thin-walled portion 111 and the thin-walled portion 112 are distorted to have a large magnetic resistance, and as a result, the loss of the stator core 100 increases. If more magnetic flux flows through the deformed portions of the thin wall portion 111 and the thin wall portion 112, the loss of the stator core 100 will increase.

As in Example 3 of the present invention, by setting the value of (magnetic flux 31 / (magnetic flux 30 + magnetic flux 31)) to 10% or less, the loss of the stator core 100 is reduced to the loss of the stator core 100 when there is no bending stress. As a result, a rotating machine with high efficiency and low heat generation can be realized.

20 perimeter of divided part, 21 perimeter of average diameter of divided part, 30, 31 magnetic flux, 100, 200, 300, 400 stator core, 101a, 101b, 201a, 301a, 401a teeth side iron core, 102a, 102b, 202a, 302a, 402a Core core on the core back side, 111, 112, 211, 212, 311, 411, 412 Thin portion.

Claims

In a stator core of a rotating electrical machine formed by fitting a first iron core on a teeth side formed by laminating steel plates and a second iron core on a core back side obtained by laminating steel plates, the first iron core and the second iron core The stator core of the rotating electrical machine is characterized in that the circumferential length of the divided portion that fits is longer than the circumferential circumference of the stator core.
In the first iron core, a plurality of teeth are linearly connected to each other at a first thin portion perpendicular to the direction in which the magnetic flux flows, and the first thin portion is deformed in an annular shape with the teeth on the inner peripheral side. The stator iron core for a rotating electrical machine according to claim 1, wherein the stator iron core is formed of
The magnetic flux flowing through the first thin portion is 10% or less of the sum of the magnetic fluxes flowing through the second iron core on the radial extension line of the first thin portion and the first thin portion. The stator iron core of the rotating electrical machine described in 1.
In the second iron core, a plurality of core back pieces are connected in a straight line at the second thin wall portion in parallel with the direction in which the magnetic flux flows, and the second thin wall is formed in an annular shape so as to be fitted to the outer periphery of the first iron core. The stator core of the rotating electrical machine according to claim 1, wherein the stator iron core is formed by deforming a portion.
The peripheral length of the divided portion where the first iron core and the second iron core are fitted is 1.1 to 1.5 times the outer peripheral circumferential length of the teeth side iron core whose outer diameter is the average diameter of the divided portion. The stator iron core for a rotating electrical machine according to any one of claims 1 to 4, wherein the stator iron core is a rotating iron machine.
The said steel plate is a magnetic steel sheet in which the magnetic flux direction of the said 1st iron core and said 2nd iron core and a rolling direction correspond, or a directionality electrical steel sheet in which a magnetic flux direction and a magnetization easy direction correspond. Item 6. A stator iron core for a rotating electrical machine according to any one of Items 5 to 6.
The rotary electric machine provided with the stator iron core in any one of Claims 1 thru | or 6.
The first iron cores connected in a straight line at the first thin portion perpendicular to the direction in which the magnetic flux flows are arranged in a row, and there are a plurality of rows in one steel plate, and a plurality of the core backs The second iron cores connected in a straight line at the second thin portion parallel to the direction in which the magnetic flux flows are arranged in a row, and there are a plurality of rows in another sheet of the steel plate, each of the steel plates is punched, 8. The stator iron core is formed by stacking and winding a plurality of teeth around each of the teeth to form an annular ring and fitting the laminated first iron core and the second iron core laminated together. The manufacturing method of the rotary electric machine provided with the stator iron core of description.