JP2014045641A - Stator core of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core of dynamo-electric machine consisting of a laminated core, that can ensure high quality and high strength with simple and inexpensive configuration.SOLUTION: In a yoke 13 of a strip core sheet 10, a thick wall part 14 having a thickness equivalent to the board thickness, and a thin wall part 15 formed thinner than the board thickness by plastic deformation processing are arranged so as to be located alternately in the circumferential direction on the outer peripheral side of each winding layer of a laminated core 1. Since the thin wall part 15 deforms plastically in a process for forming the laminated core 1 cylindrically, a cylindrical laminated core 1 can be formed well, and since the thick wall parts 14 are laminated while being arranged in the lamination direction of the laminated core 1 and in tight contact with each other at the outer peripheral edge of each winding layer thereof, no gap appears at the outer peripheral edge of each laminated core 1, and thereby high quality and high strength can be ensured.

Description

  The present invention relates to a stator core suitable for a stator core of a rotating electrical machine, particularly a stator of an automotive alternator.

[Conventional technology]
In recent years, this type of stator core is formed by punching a ring-shaped plate having teeth and slots on the inner peripheral side from a magnetic plate (for example, a steel plate) and laminating a large number of this ring-shaped plate into a cylindrical shape. Instead of a laminated core, a belt-shaped core sheet with a tooth part and a slot part punched out on one side and wound into a spiral shape (helical) over a plurality of layers for the reason that there is little waste material and the material yield is good A laminated core formed by winding and laminating has come to be employed exclusively (for example, see Patent Document 1).

The conventional stator iron core described in Patent Document 1 will be outlined based on FIG.
The greatest feature of this stator core is that a core sheet 100 formed of a strip-shaped magnetic plate (for example, a steel plate) is used as the core material.
As shown in FIGS. 10A and 10B, the core sheet 100 includes teeth (teeth) portions 101 and slots (grooves) portions 102 for winding a stator coil on one side in the length direction. And has a yoke (joint) portion 103 for connecting the teeth portion 101 and the slot portion 102 at a predetermined pitch on the other side in the length direction, and the teeth portion 101 and the slot are formed from a belt-like magnetic plate. Since the pair of (two) strip-shaped core sheets 100 can be produced by alternately placing the portions 102 and punching out, it is possible to minimize the waste material portion at the time of manufacturing the core sheet 100 and to improve the material yield. The material cost can be reduced.

Then, the core sheet 100 is wound and laminated over a plurality of layers while being spirally wound so that the yoke portion 103 is on the outer peripheral side as shown in FIG. 10C, thereby forming a cylindrical shape as shown in FIG. The laminated core 200 is used.
In the process of winding the laminated core 200, the yoke portion 103 of the core sheet 100 is rolled, and the outer peripheral edge of the yoke portion 103 is thinly extended with a rolling roll as shown in FIG. By using the tapered portion 104, the substantial winding peripheral length on the yoke portion 103 side of the core sheet 100 is generally increased to facilitate winding in a spiral shape.

[Problems of the prior art]
However, as described above, the cylindrical laminated core 200 spirally wound with the tapered portion 104 has a thickness (plate thickness) of the outer peripheral edge of each winding layer of the yoke portion 103 as compared with the tooth portion 101. As shown in FIG. 10 (f), the gap S between the winding layers of the yoke portion 103 is viewed in a virtual cross section cut along the radial direction (the CC cross section in FIG. 10 (e)). As a result of the existence of this gap S, there are various problems as listed below.

(1) The laminated core 200 is subjected to outer peripheral welding for fixing the winding layers or ironing for adjusting the outer peripheral shape as the final step, but it becomes thin due to the presence of the gap S and is subjected to external force. On the other hand, the outer peripheral edge that has become a fragile part is deformed or damaged in the process of transporting to the final process. When the ironing process is performed, it is deformed or damaged, which causes problems in strength and quality.
(2) Further, when the stator core is used as a part of the casing of the rotating electrical machine as in the case of an automotive alternator, the presence of the gap S at the outer peripheral portion of the laminated core 200 becomes a big problem.
That is, when the both ends of the laminated core 200 are clamped and fixed from the lamination direction (axial direction) by a cup-shaped housing (also referred to as a frame), a bending moment acts on the housing in the direction of reducing the gap S. Excessive stress will be applied to the assembly bolt and housing. As a countermeasure, for example, as described in Patent Document 2, a method of disposing a special annular sheet having a large thickness at both ends of the laminated core has been proposed. Incurs high costs and is difficult to put into practical use.
(3) Further, since the gap S reduces the thickness of the outer peripheral portion of the laminated core 200 in the stacking direction, the magnetic flux density is high in the yoke portion 103 when the rotating electrical machine is required to be small and have high output. There is a risk that the effective magnetic path area of the portion will be reduced, resulting in a decrease in magnetic performance and a decrease in the output of the rotating electrical machine.

  As a result of repeating various experiments and researches to find out such a problem, the present inventor devised the structure of the thickness change region applied to the yoke portion while using a strip-shaped core sheet as an iron core material. The present inventors have found an effective means that can realize a stator core having high strength, high quality, and high magnetic performance while sufficiently satisfying a simple and inexpensive configuration.

Japanese Patent No. 4497187 JP 2001-112197 A

  The present invention has been made in view of the above circumstances, and its purpose is to fix a rotating electrical machine that can ensure high strength, high quality, and high magnetic characteristics while having a simple and inexpensive configuration. To provide a child iron core.

[Means of Claim 1]
The invention according to claim 1 (a stator core of a rotating electrical machine) uses a belt-shaped core sheet made of a magnetic plate as an iron core material, and includes a tooth portion and a slot portion for winding a stator coil on the inner peripheral side. It has a basic structure consisting of a cylindrical laminated core. The core sheet has a tooth portion and a slot portion on one side in the length direction, and a yoke portion that connects the teeth portion and the slot portion at a predetermined pitch on the other side in the length direction. The core is formed by winding the core sheet in a cylindrical shape by spirally winding the yoke portion on the outer peripheral side. Arranged so that thick portions having the same thickness and thin portions formed thinner than the thickness of the core sheet by plastic deformation are alternately positioned in the circumferential direction on the outer peripheral side of each winding layer of the laminated core The thin-walled portion is plastically deformed in the process of forming the laminated core into a cylindrical shape, and the thick-walled portion is aligned in the laminating direction of the laminated core, and in each winding layer of the laminated core Mutually on the entire surface including the outer periphery It is characterized in that it is laminated in close contact with the.

  According to the invention of claim 1 having the above-described configuration, the belt-shaped core sheet can be wound in a spiral shape by the thin-walled portion formed by plastic deformation processing on the yoke portion, so that the configuration is simple and inexpensive. The stator core can be provided as well as the following effects.

(1) In the laminated core, the outer peripheral edge of each winding layer only has a concave part locally, and the thick parts are laminated in close contact with each other. In addition, the laminated core can be transported without damaging it to the final process, and the final process (peripheral welding to fix the winding layers, ironing to adjust the outer peripheral shape, etc.) can be carried out well, resulting in poor welding In addition, it is possible to obtain a high-strength, high-quality stator core by preventing irregular deformation and breakage of the outer periphery.
(2) In addition, even when the stator core is used as a part of the casing of the rotating electrical machine, the laminated core is laminated in close contact with each other at the thick part, and there is a gap over the entire circumference. Therefore, when the both ends of the laminated core are clamped and fixed by the cup-shaped housing from the lamination direction (axial direction), excessive stress is not applied to the housing and the assembly bolt.
(3) Further, since only the thin wall portion is locally provided on the outer peripheral edge of each winding layer of the laminated core, by providing the thin wall portion corresponding to the arrangement position of the teeth portion, A sufficient effective magnetic path area can be ensured in a portion where the magnetic flux density is high, and the output is not reduced even in a small and high output rotating electric machine.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically shows an automotive alternator to which a stator core of the present invention is applied, in which (a) is a half sectional view showing the overall configuration of the alternator, and (b) is a cross-sectional view taken along line AA in (a). (Example 1) which is a front view of the upper half part which shows the form of a stator iron core single-piece | unit. The main part of the stator core of this invention is shown, (a) is a front view of the core sheet before winding, (b) and (c) are the front view and side surface of the core sheet which are used for description of a winding process. Figures (d) and (e) are cross-sectional views taken along lines AA and BB in (b), (f) is a side view of the laminated core, and (g) is a CC line in (f). (Example 1) which is sectional drawing which follows this. The principal part of the stator core of this invention is shown, (a) and (b) are the front view and side view of a laminated core which are used for description of the winding process and the characteristic matter of a core sheet, (c) and (d) () Is sectional drawing which follows the AA line and BB line of (a) (Example 2). The principal part of the stator core of this invention is shown, (a) and (b) are the front view and side view of a laminated core which are used for description of the winding process and the characteristic matter of a core sheet, (c) and (d) () Is sectional drawing which follows the AA line and BB line of (a) (Example 3). The principal part of the stator core of this invention is shown, (a) and (b) are the front view and side view of a laminated core which are used for description of the winding process and the characteristic matter of a core sheet, (c) and (d) () Is sectional drawing which follows the AA line and BB line of (a) (Example 4). The principal part of the stator core of this invention is shown, (a) And (b) is the front view and side view of a laminated core which are used for description of the winding process and the characteristic matter of a core sheet, (c), (d) (E) is sectional drawing which follows the AA line of FIG. (A), a BB line, and CC line (Example 5). The principal part of the stator core of this invention is shown, (a) and (b) are the front view and side view of a laminated core which are used for description of the winding process and the characteristic matter of a core sheet, (c) and (d) (A) is sectional drawing which follows the AA line and BB line of (a) (Example 6). The principal part of the stator core of this invention is shown, (a) and (d) are the front view and side view with which it uses for description of the characteristic matter of a core sheet, (b) and (c) are A of (a). Sectional views along the lines -A and BB, (e) is a side view for explaining the features of the laminated core, and (f) is a sectional view along the CC line in (e) (Example 7). ). The principal part of the stator core of this invention is shown, (a) is a front view with which it uses for description of the characteristic matter of a core sheet, (b) and (c) are the expansion front views and side views of a thin part ( Example 8). It serves for explanation of a conventional stator core of a rotating electric machine, (a) is a front view of a core sheet before winding, (b) is a cross-sectional view taken along the line AA of (a), (c) is Front view of core sheet after winding, (d) is a sectional view taken along line BB in (c), (e) is a side view of the laminated core, and (f) is a line CC in (e). It is sectional drawing which follows (conventional example).

  Hereinafter, the best mode for carrying out the present invention will be described in detail according to six embodiments shown in the drawings.

Each example shows a stator core of an alternator for automobiles as a representative example of a stator core to which the present invention is applied. In the following description, first, the basic configuration of an alternator for automobiles is shown. In the following, features in each embodiment of the present invention and basic functions of the present invention will be described in order, and finally, effects of each feature of the present invention will be summarized.
Note that, in each embodiment, the same or equivalent parts are denoted by the same reference numerals, and redundant description is omitted.

[Example 1]
A first embodiment of the present invention will be described with reference to FIGS.

[Basic configuration of AC generator G]
As shown in FIG. 1 (a), an AC generator G includes a rotor GR attached to a rotating shaft J driven by an engine, and a pair of cup-shaped housings (also referred to as frames) H. And a stator GS sandwiched and fixed by an assembly bolt F. The stator GS has a cylindrical shape as shown in FIG. 1B as an iron core to which a stator coil (multiphase winding) D is attached. A stator core E having a laminated core is used.

  The stator core E is used as a part of the casing of the AC generator G by being sandwiched and fixed by a pair of cup-shaped housings H, and is disposed on the inner peripheral side of the stator. A plurality of teeth (teeth) E1 and slots (grooves) E2 around which the coil D is wound are alternately provided, and yokes (relays) that connect the teeth E1 and the slots E2 in an annular shape at a predetermined pitch on the outer peripheral side. ) The cylindrical laminated core 1 is provided with a portion E3. The annular yoke portion E3 is a non-winding portion around which the stator coil D is not wound, and a plurality of plate thickness changing regions E4 which will be described in detail later are arranged in the circumferential direction.

[Basic structure of laminated core 1]
The laminated core 1 uses a belt-like core sheet 10 as shown in FIG. 2A as an iron core material. This core sheet 10 is produced as a pair (two sheets) of band-shaped core sheets by punching out from the band-shaped magnetic plate (for example, a steel plate) so that the teeth and slots are alternately arranged. A tooth (tooth) portion 11 and a slot (groove) portion 12 for winding the stator coil D on one side in the length direction are provided, and the teeth portion 11 and the slot portion 12 are provided on the other side in the length direction. Are provided at a predetermined pitch.
Then, as shown in FIG. 2 (b), the core sheet 10 is wound and laminated over a plurality of layers while being spirally wound so that the yoke portion 13 is on the outer peripheral side. A cylindrical laminated core 1 as shown in FIG.

[Features of laminated core 1]
As shown in FIGS. 2B and 2C, the laminated core 1 of the present invention is subjected to plastic deformation processing for forming a plate thickness changing region E4 as shown in FIGS. The greatest feature is that the core sheet 10 is rounded into a circular shape by using the region E4.
As shown in FIGS. 2 (b) to 2 (e), the plate thickness changing region E 4 is formed by a thick portion (non-plate thickness reducing portion) 14 having a thickness equivalent to the plate thickness of the core sheet 10 and plastic deformation. It is comprised by the thin part (plate thickness reduction | decrease part) 15 formed thinner than the plate | board thickness of the core sheet 10, and as shown in FIG.2 (f), in the outer periphery of each winding layer of the laminated core 1, The thin wall portions 15 are arranged so as to be alternately positioned in the circumferential direction.
Here, the thick portion 14 and the thin portion 15 are in a relative relationship in which all the remaining plate thickness portions after forming the thin portion 15 in the yoke portion 13 form the thick portion 14. Therefore, a plurality of plate thickness changing regions E4 are arranged in the yoke portion 13 over the entire circumference.

  In particular, in the present embodiment, the thick portion 14 and the thin portion 15 correspond to the arrangement positions of the teeth portion 11 and the slot portion 12 in the yoke portion 13 of the core sheet 10, that is, behind the teeth portion 11. The thick portion 14 is provided behind the slot portion 12 and the thin portion 15 is provided in the same number as the teeth portion 11 and the slot portion 12, respectively.

Further, the thin portion 15 has a radial width O shorter than the radial width Q of the yoke portion 13 (O <Q), and a virtual cross section cut along the radial direction (cross section AA in FIG. 2B). As shown in FIG. 2 (d), the plate thickness is composed of a double-sided tapered portion 15 a that gradually decreases from both end surfaces toward the outer peripheral edge of the laminated core 1.
The double-sided tapered portion 15a has a trapezoidal shape in which the width in the circumferential direction increases toward the outer peripheral edge.

  Thus, the thin portion 15 is formed by plastic deformation processing in the “process of winding the laminated core 1 into a cylindrical shape”, and the outer peripheral portion of the laminated core 1 (on the yoke portion 13 side of the core sheet 10). The side has a function of making the core sheet 10 spirally wound up.

  Here, “the process of forming the laminated core 1 in a cylindrical shape” means a process from the stage before the core sheet 10 is spirally wound (pre-process) until the core sheet 10 is further wound. As a specific method for forming the thin portion 15 in the process, there are the following two methods. In the first method, when the core sheet 10 is wound in a spiral shape, for example, a rolling part is locally provided on a winding roller that sandwiches the core sheet 10, and the thin portion 15 is formed at the same time in a spiral shape. The second method is a method in which the thin portion 15 is stamped and formed on the core sheet 10 shown in FIG.

On the other hand, the thick wall portion 14 is aligned in the stacking direction (axial direction) of the stacked core 1 as shown in FIGS. The entire surface including is laminated in close contact with each other.
Therefore, although the concave portion M is locally formed at the thin portion 15 on the outer peripheral surface of the laminated core 1, the entire laminated core 1 including the outer peripheral edge of the laminated core 1 is substantially dense in the laminating direction. In a stacked state.

[Basic Functions of Example 1]
Next, the basic function of the laminated core 1 (stator core E) having the above configuration will be described.
The core sheet 10 is provided with a plate thickness changing region E4 in the yoke part 13, and the thick parts 14 and the thin parts 15 are alternately arranged. Therefore, when winding the core sheet 10 in a spiral shape, Each winding layer can be favorably rounded into a circular shape by plastic deformation of the thin-walled portion 15, and a high-quality cylindrical laminated core 1 can be obtained.

  In particular, the thin-walled portion 15 is a tapered double-sided tapered portion 15a, and the tapered portion 15a has a trapezoidal shape in which the width in the circumferential direction increases toward the outer peripheral edge. When rounding 10, it can be bent into a circular shape closer to a perfect circle while increasing the outer peripheral length.

Moreover, although this laminated core 1 has the recessed part M by the thin part 15 locally on an outer peripheral surface, the thick part 14 exists in each winding layer, and this thick part 14 is a laminated core. 1 are aligned in the laminating direction and are laminated in close contact with each other on the entire surface including the outer peripheral edge of the laminated core 1, so that all the layers as shown in FIG. There is substantially no gap S over the circumference.
Therefore, even if an external force is applied in the process of transporting the laminated core 1 to the final manufacturing process of the stator core E, the outer peripheral edge of the laminated core 1 is not deformed or damaged.
Similarly, when performing the welding process for fixing the winding layer and the ironing process for adjusting the outer peripheral shape on the outer peripheral portion of the laminated core 1 in the final manufacturing process, the welding failure and the outer peripheral edge are not detected. The stator core E can be secured with high strength and high quality without being deformed or damaged.

  Further, in order to use the stator core E as a part of the housing of the AC generator G, as shown in FIG. Since the core 1 can be tightened in parallel from both end surfaces in the stacking direction, excessive stress is not applied to the housing H and the assembly bolt F.

In addition, in the laminated core 1 having the above-described configuration, the following effects can be expected with respect to heat flow and strength in the radial direction.
That is, the yoke portion 13 is provided with a region where the thickness is reduced and the thermal resistance is large (region of the thin portion 15) and the other region where the thermal resistance is relatively small (region of the thick portion 14). By concentrating the region on the region where the core temperature becomes high, the heat dissipation effect can be promoted, and the cross-sectional area of the region requiring strength against the external force received from magnetic attraction force or external vibration is thick. It can be increased in the region of the portion 14 and can further contribute to the improvement of performance and reliability as the stator core E (rotary electric machine).

[Example 2]
Next, a second embodiment of the present invention will be described based on FIG. 3 with a focus on differences from the first embodiment.
The laminated core 1 (stator core E) shown in Example 2 has a basic configuration of the plate thickness changing region E4 formed in the core sheet 10 and a spiral shape so that the yoke portion 13 is on the outer peripheral side. Although it is exactly the same as that of the first embodiment in that the cylindrical laminated core 1 is formed by winding, the thin-walled portion 15 itself has a feature.

As shown in FIGS. 3A and 3B, the plate thickness changing region 4 </ b> E has a thick portion 14 and a thin portion 15 in the yoke portion 13 of the core sheet 10, as in the first embodiment. In correspondence with the arrangement positions of the slot portions 12, the same number as the teeth portions 11 and the slot portions 12 are arranged.
However, the thin wall portion 15 has a trapezoidal shape in which the circumferential width becomes wider toward the outer peripheral edge, but the radial width O is equal to the radial width Q of the yoke portion 13 (O = Q). It substantially crosses the yoke portion 13. That is, the thin portion 15 has a groove shape in which the plate thickness of the full width in the radial direction is thinner than the plate thickness of the core sheet 10.
And in the virtual cross section (AA cross section in Fig.3 (a)) cut | disconnected along a radial direction, the thin part 15 is plate | board thickness from the inner periphery of the lamination | stacking core 1 to an outer periphery as shown in FIG.3 (c). A groove-type taper portion 15b having a double-sided taper shape that gradually decreases from both side surfaces toward the end is formed.
Thus, the cooling passage 2 is formed in the yoke portion 13 through the groove of the groove-type taper portion 15b. The cooling passage 2 crosses the inner peripheral side and the outer peripheral side of the laminated core 1.

According to the second embodiment having the above-described configuration, the same function as that of the first embodiment can be obtained, and the cooling passage 2 is provided on the outer peripheral side and the inner peripheral side (in the slot portion 12) of the yoke portion 13 in each layer of the laminated core 1. Therefore, cooling air is taken into the slot portion 12 from the outer periphery of the laminated core 1 to cool the stator coil D, and loss due to heat generation of the stator coil D can be reduced.
Therefore, the stator core E that contributes to improving the performance of the AC generator G can be provided.

[Example 3]
Next, a third embodiment of the present invention will be described based on FIG. 4 with a focus on differences from the first embodiment.
In the laminated core 1 (stator core E) shown in the third embodiment, the plate thickness changing region E4 formed in the yoke portion 13 of the core sheet 10 is divided into the thick portion 14 and the thin portion 15 as in the first embodiment. Although the basic configuration is configured, it is characterized in that the arrangement of the thick portion 14 and the thin portion 15 with respect to the teeth portion 11 and the slot portion 12 is reversed from that of the first embodiment.

  That is, as shown in FIGS. 4A and 4B, the plate thickness changing region 4 </ b> E configured by the thick portion 14 and the thin portion 15 is the yoke portion 13 of the core sheet 10, and the thin portion 15 is the teeth. The same number of the thick portions 14 as the teeth portions 11 and the slot portions 12 are formed so as to correspond to the arrangement positions of the portions 11 and the arrangement positions of the slot portions 12, respectively.

  Note that the structure of the thin wall portion 15 itself is substantially the same as that of the first embodiment, and the radial width P is shorter than the radial width Q of the yoke portion 13 (P <Q) and is cut along the radial direction. In the virtual cross section (the BB cross section in FIG. 4 (a)), as shown in FIG. 4 (d), the double-sided taper taper in which the plate thickness gradually decreases from both end surfaces toward the outer peripheral edge of the laminated core 1. Part 15a is formed. Further, the double-sided tapered portion 15a has a trapezoidal shape in which the width in the circumferential direction becomes wider toward the outer peripheral edge.

According to the third embodiment having the above configuration, the same function as that of the first embodiment can be obtained, and the magnetic performance can be improved as compared with the first embodiment.
That is, in the yoke portion 13, the magnetic flux density is relatively higher in the vicinity of the slot portion 12 than in the vicinity of the tooth portion 11. Therefore, by providing the thin portion 15 behind the tooth portion 11, The yoke portion is the thick portion 14, and the effective magnetic path cross-sectional area of the portion behind the slot portion 12 where the magnetic flux density becomes high can be utilized to the maximum.
When there is a margin in the effective magnetic path area behind the tooth portion 11, the radial width P of the thin portion 15 may be substantially equal to the radial width Q of the yoke portion 13 (P = Q). .

[Example 4]
Next, a fourth embodiment of the present invention will be described based on FIG. 5 with a focus on differences from the first to third embodiments.
The laminated core 1 (stator core E) shown in Example 4 is a combination of the structure of Example 2 shown in FIG. 3 and the structure of Example 3 shown in FIG.

That is, in the plate thickness changing region E4, as shown in FIGS. 5A and 5B, the thin wall portion 15 is provided corresponding to the arrangement positions of both the tooth portion 11 and the slot portion 12, and the thick wall portion 15 It is characterized in that the number of arrangement of the portion 14 and the thin portion 15 is doubled.
And the thin part 15 corresponding to the arrangement position of the slot part 12 is implemented as shown in FIG.5 (c) in the virtual cross section (AA cross section in FIG.5 (a)) cut | disconnected along a radial direction. A double-sided tapered groove-type taper portion 15b similar to that in Example 2 is formed, and the cooling passage 2 is formed to communicate with the yoke portion 13 across the inner peripheral side and the outer peripheral side of the laminated core 1. Moreover, as shown in FIG.5 (d), the thin part 15 corresponding to the arrangement position of the teeth part 11 is implemented in the virtual cross section (BB cross section in Fig.5 (a)) cut | disconnected along a radial direction. The taper part 15a of the double-sided taper shape similar to Example 3 is comprised.

  According to Example 4 of the above configuration, the same function as in Example 1 can be obtained, and, of course, the number of thin portions 15 is doubled and increased, so when winding the core sheet 10 in a spiral shape , There is little fluctuation due to the part of curvature per turn, and it can be rounded into a circular shape closer to a perfect circle. Therefore, a higher quality cylindrical laminated core 1 can be obtained.

  In this embodiment, the dimensional relationship between the radial widths O and P of both the thin portions 15 (the width O of the tapered portion 15b and the width P of the tapered portion 15a) and the radial width Q of the yoke portion 13 is expressed as O = Q>. Although the relational expression of P is satisfied, as a modification, (1) Of course, it is possible to make all radial widths the same for the same reason as in the third embodiment (O = P = Q). Further, (2) the thin portion 15 corresponding to the slot portion 12 is a tapered portion 15a having the same structure (O <Q) as in the first embodiment, and the relationship between the radial widths O and P of both thin portions 15 is expressed as O The relational expression <P may be satisfied.

[Example 5]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
The laminated core 1 (stator core E) shown in the fifth embodiment corresponds to a modification of the second embodiment shown in FIG. 3 and is characterized in that the structure of the plate thickness changing region E4 is asymmetric on both sides. have.

  As shown in FIGS. 6A and 6B, the yoke portion 13 of the core sheet 10 is provided with a thick portion 14 and a thin portion 15 corresponding to the arrangement positions of the teeth portion 11 and the slot portion 12. However, as the thin portion 15 corresponding to the arrangement position of the slot portion 12, two types of thin portions 15A and 15B are employed.

As shown in FIGS. 6B and 6C, one thin portion 15A has a double-sided tapered groove-type tapered portion 15b similar to that of the second embodiment, whereas the other thin portion 15B. As shown in FIGS. 6 (b) and 6 (d), it has a groove-type taper portion 15c having a single-sided taper shape, and thin portions 15A and thin portions 15B are alternately provided.
Therefore, as shown in FIGS. 6 (a), (b), (d), and (e), one side of the core sheet 10 is connected to the one side of the thin part 15B with the adjacent thick part 14 A wide plane (flat surface) can be formed.
A cooling passage 2 is formed in the yoke portion 13 through the grooves of the groove-type taper portions 15b and 15c. The cooling passage 2 connects the inner peripheral side and the outer peripheral side of the laminated core 1 in a transverse manner.

According to the fifth embodiment having the above-described configuration, the same function as that of the second embodiment can be obtained. In addition, since the close contact area including the outer peripheral edge can be increased in each winding layer, each winding layer is inclined. And a stable posture can be maintained, and the laminated core 1 as a whole can maintain parallelism between both end faces in the laminating direction. Thereby, in assembling the stator core E, it is possible to contribute to a reduction in stress of the assembly bolt F and the housing H.
Further, since the two types of thin wall portions 15A and 15B are substantially different in thickness due to the difference in taper shape, the yoke portion 13 can be provided by alternately providing the thin wall portions 15A and the thin wall portions 15B. The cross-sectional area and strength in the region of the thin wall portion 15 can be varied in the circumferential direction. Therefore, the design freedom in terms of heat flow (heat dissipation) and strength in the laminated core 1 can be improved.

In addition, as a modified example of the fifth embodiment, which is characterized in that a thin-walled portion 15B having a single-side tapered shape is adopted as the thin-walled portion 15, the following structure may be employed.
(Modification 1)
The thin portions 15B having a single-side tapered shape are adopted for all the thin portions 15, and the thin portions 15B are arranged in the circumferential direction with respect to the core sheet 10 so that the tapered sides are alternately positioned on the front and back sides. That is, a double-sided symmetrical structure is formed by only the thin portion 15B.
(Modification 2)
By changing the arrangement pitch of the two types of thin portions (thin portion 15A and thin portion 15B) according to the purpose, the degree of freedom in design can be further increased.

[Example 6]
Next, Embodiment 6 of the present invention will be described with reference to FIG.
The laminated core 1 (stator core E) shown in the sixth embodiment corresponds to the modified example of the fifth embodiment in that two types of thin-walled portions 15C and 15D are employed, but the optimum design of the stator core E is described. The structural example for raising a freedom degree more is shown.

As shown in FIG. 7A, the yoke portion 13 of the core sheet 10 is provided with a thin portion 15 corresponding to the arrangement positions of both the teeth portion 11 and the slot portion 12 as the plate thickness changing region E4. Two types of thin portions 15C and 15D having extremely different radial widths are employed.
As shown in FIG. 7C, the thin portion 15C corresponding to the arrangement position of the slot portion 12 has a radial width O that is extremely short, for example, about half of the radial width Q of the yoke portion 13. The thin portion 15D corresponding to the arrangement position of the teeth portion 11 has, for example, a radial width P substantially equal to the radial width Q of the yoke portion 13 as shown in FIG. The two thin portions 15C and 15D are configured such that the radial widths O and P satisfy the relational expression of O << P.
The thick portion 14 is provided with notches 3 positioned on both sides of the thin portion 15. This notch 3 is provided in the outer peripheral part of the yoke part 13 so that the plastic deformation area | region of the thin part 15 may be defined before the board thickness change area | region E4 is formed with respect to a core sheet.

According to the sixth embodiment having the above-described configuration, the following functions are exhibited by providing the notch 3 specially.
That is, the material flow at the time of forming the thin portion 15 tends to cause distortion near the boundary of the thin portion region, and the plate thickness near the boundary of the thick portion 14 becomes thin, whereas the plate thickness changing region E4 is formed. Since the notch 3 is provided in the core sheet 10 so as to be located on both sides of the thin portion 15 in the previous stage, the material flow region is limited by the notch 3 so that the plastic deformation region of the thin portion 15 is substantially reduced. Can be partitioned. Therefore, a predetermined plate thickness can be ensured in the thick portion 14 over the entire region.

Furthermore, according to the present embodiment, in addition to the effect of the notch 3 described above, by selecting various widths (radial direction and circumferential direction) of the two types of thin portions 15C and 15D, It is possible to further increase the degree of design freedom for optimally balancing the magnetic resistance, roundness, core rigidity, and the like.
For example, (1) In the yoke portion 13, the magnetic flux density is relatively higher in the vicinity of the slot portion 12 than in the vicinity of the tooth portion 11, so two types of thin portions 15 </ b> C having a radial width relationship of O << P. , 15D, the effective magnetic path cross-sectional area of the portion behind the slot portion 12 where the magnetic flux density is high can be relatively increased (the magnetic resistance is reduced). (2) Moreover, even if the radial width O is small, the presence of the thin portion 15C can contribute to small-scale winding of the core sheet 10. (3) By providing the thin portion 15D having a large radial width P behind the teeth portion 11 where the bending rigidity is relatively high, the entire bending rigidity can be homogenized, and the circular shape is closer to a perfect circle. Can be formed. (4) Conversely, by reducing the radial width P and the circumferential width of the thin portion 15 provided behind the teeth portion 11, the thick portion 14 of the yoke portion 13 behind the teeth portion 11 is increased. A flat surface can be secured and the strength of the laminated core 1 in the stacking direction can be increased.

[Example 7]
Next, a seventh embodiment of the present invention will be described with reference to FIG.
The laminated core 1 (stator core E) shown in Example 7 corresponds to a modification of Example 1 shown in FIG. 2 or Example 3 shown in FIG. 4, and covers one end face in the lamination direction over the entire surface. Try to make it flat.
That is, in Example 1 and Example 3, the double-sided tapered portion 15a is employed as the thin portion 15, whereas in this embodiment, the single-side tapered portion 15e is employed in all the thin portions 15. And it has the characteristics in the point arranged in the core sheet | seat 10 so that the taper side may become the same side.

  In particular, in the example shown in FIG. 8, the thin portion 15 is formed so as to correspond to the teeth portion 11, which corresponds to a modification of the third embodiment, and will be supplemented below.

As shown in FIGS. 8A to 8C, the yoke portion 13 of the core sheet 10 is provided with a thin portion 15 formed of a tapered portion 15 e having a single-side tapered shape at a position corresponding to the tooth portion 11. .
Further, as shown in FIG. 8D, the taper portions 15e are arranged so that the taper side is the same side.
According to such a structure, one surface of the core sheet 10 can be a flat surface (flat surface) F over the entire circumference.
And the laminated core 1 as shown to FIG.8 (e), (f) is obtained by winding the said core sheet 10. FIG.
In this laminated core 1, although the concave portion N due to the thin portion 15 is locally present on the outer peripheral surface, each winding layer has a flat surface (plane F) on one side end surface in the laminating direction. Laminated closely over the entire surface including the periphery

According to the seventh embodiment having the above configuration, the same function as that of the third embodiment can be obtained, and the following special function can be obtained.
That is, since one side of the core sheet 10 is a plane F over the entire circumference, and one end face in the stacking direction of the stacked core 1 can be a flat surface (plane F), the stator core E is a pair of stacked cores. 1 and the pair of laminated cores 1 can be provided such that flat end surfaces (planes F) are provided as attachment surfaces of the stator core E (surfaces sandwiched and fixed by the housing H).
In such a configuration, the mounting surface of the stator core E and the housing H can be brought into close contact over the entire circumference, so that moisture or the like can be reliably prevented from entering from the mounting surface. An anticorrosion function can be obtained.

In addition, as a modified example in which the thin portion 15 formed of the tapered portion 15e having such a one-side tapered shape is employed, the following structure may be employed.
(Modification 1)
The thin portion 15e may be formed corresponding to the slot portion 12 as in the first embodiment shown in FIG. Of course, it may be formed corresponding to both the teeth portion 11 and the slot portion 12.
(Modification 2)
Also in other examples other than Example 1 and 2 mentioned above, all the thin parts 15 are made into the thin part 15 which consists of the taper part 15e of a single-sided taper shape, and the core sheet | seat 10 is set so that the taper side may become the same side. By arranging, the same effect as in the seventh embodiment can be obtained.

[Example 8]
Next, a special structural example of the thin portion 15 that can be employed in each of the above-described Examples 1 to 7 and its modifications will be described as Example 8 with reference to FIG.
This Example 8 shows a structural example for further improving the degree of freedom in the optimal design of the stator core E by devising the structure of the thin-walled portion 15 itself. The thin-walled portion 15 includes a plurality of thin-walled portions 15 extending in the radial direction. It is characterized by comprising a thin-walled portion 15E made up of the concave and convex strips 15f.

  In particular, in the example shown in FIG. 9, the thin portion 15 </ b> E is formed corresponding to the teeth portion 11, and the thin portion 15 </ b> E is configured by a one-side tapered shape. It is equivalent and will be described in detail below.

As shown in FIG. 9A, each thin portion 15E is composed of a plurality of ridges 15f extending in the radial direction, and the ridges 15f are aligned in the circumferential direction.
And as shown in FIG.9 (b), the some uneven | corrugated strip 15f has the space | interval X of the circumferential direction between the adjacent uneven strips 15f. The circumferential interval X between adjacent ridges 15f is smaller than the circumferential interval Y of adjacent thin portions 15E.
Further, as shown in FIG. 9C, the thin portion 15E is formed in a dish shape so that the thickness of the thin portion 15E gradually decreases from both ends in the circumferential direction toward the center by the plurality of concave and convex portions 15f. Has been. Since the plurality of concave and convex strips 15f are formed as inclined grooves whose depth gradually increases from the vicinity of the root of the teeth portion 11 to the outer peripheral edge of the yoke portion 13 behind the teeth portion 11 in the yoke portion 13, It can also be adjusted by adjusting the depth of the ridges 15f.
Moreover, as shown in FIGS. 9A and 9B, the plurality of uneven strips 15f have different radial lengths. In particular, in this embodiment, the plurality of concave and convex strips 15f have the shortest radial length of the concave and convex strips 15f located on both ends in the circumferential direction.
In addition, although each uneven | corrugated strip 15f has comprised the triangular shape which the front end side located in an inner peripheral side becomes tapered, a rectangular shape may be sufficient.
Thus, the thin-walled portion 15E having the above configuration has a trapezoidal shape in which the width in the circumferential direction becomes wider toward the outer peripheral edge as a whole.

As described above, the present embodiment is characterized in that the thin-walled portion 15 is configured by the thin-walled portion 15E composed of a plurality of concave and convex strips 15f extending in the radial direction. It can be formed by the same method.
That is, the thin-walled portion 15E is formed by plastic deformation processing in the “process of winding the laminated core 1 into a cylindrical shape”, and the outer peripheral portion of the laminated core 1 (on the yoke portion 13 side of the core sheet 10). Side) has a function of increasing the substantial winding circumference and facilitating winding of the core sheet 10 in a spiral shape.

Here, “the process of forming the laminated core 1 in a cylindrical shape” means that the core sheet 10 is wound further from the stage before the belt-like core sheet 10 is spirally wound (pre-process). The process for forming the thin portion 15E in the process is roughly divided into the following two methods.
In the first method, when the belt-shaped core sheet 10 is wound in a spiral shape, for example, a rolling part is locally provided on a winding roller that sandwiches the core sheet 10, and the thin part 15E is formed at the same time. The second method is a method in which the thin-walled portion 15E is stamped and formed on the strip-shaped core sheet 10 as a pre-winding process, for example, with a press.
However, as another method, for example, as shown in FIG. 4, a thin portion 15 having a flat tapered surface is formed once, and then a concave and convex strip 15 f is engraved on the flat tapered surface to form a thin portion 15 E. It is also possible to adopt the method.

According to the eighth embodiment having the above configuration, the same function as that of the seventh embodiment can be obtained, and the following special function can be obtained.
That is, since the thin portion 15E is composed of the plurality of uneven strips 15f, the hardness (strength) of the thin portion 15E itself can be increased by so-called work hardening by providing the uneven strips 15f. As a result, the regions where the thickness is relatively large between the thin portions 15E (the regions of the thick portions 14) and the regions of the thin portions 15E whose strength has been increased by work hardening are alternately arranged in the circumferential direction. be able to.
Thereby, although the thin part 15E is formed in the core sheet 10, the strength of the core sheet 10 as a whole can be increased, and the strength distribution in the circumferential direction of the laminated core 1 can be adjusted.

In addition, as a modified example in which the thin portion 15E including a plurality of ridges 15f extending in the radial direction is adopted as the thin portion 15, the following structure may be employed.
(Modification 1)
In each of the first to sixth embodiments other than the seventh embodiment, the same effects as in the eighth embodiment can be obtained by configuring all the thin portions 15 with the thin portions 15E.
(Modification 2)
The pattern of the plurality of concave and convex strips 15f provided on the thin wall portion 15E (the number of concave and convex strips, the depth, the length, the shape of each strip itself, etc.) may be different for some thin wall portions 15E. For example, you may change the pattern of the several uneven | corrugated strip 15f in the adjacent thin part 15E.
(Modification 3)
The core sheet 10 can be provided with a thin portion 15E across the front and back. In this case, the pattern of the uneven strip 15f of the thin portion 15E may be different between the front and back of the core sheet 10.
For example, as the thin portion 15E, a taper portion having a single-side taper shape in which the plate thickness gradually decreases from only one end surface toward the outer peripheral edge of the laminated core 1 in a virtual cross section cut along the radial direction is employed. This is formed over both surfaces of the core sheet 10, and a plurality of concave and convex strips (15f) are formed by a thin portion 15E disposed on one surface side of the core sheet 10 and a thin portion 15E disposed on the other surface side. ) Pattern is different.
In addition, the thin part 15E arrange | positioned on the front and back of the core sheet 10 may be either the same position or a different position in the circumferential direction.

In each of the above Examples 1 to 8 and the modifications thereof, “the thick portion 14 having a thickness equivalent to the thickness of the core sheet 10” and “the thin portion 15 formed thinner than the thickness of the core sheet 10”. However, the present invention is not limited to this and is not limited to this, and the “core sheet (10) used in the claims of the present invention is used. ) ”And“ thin wall portion (15) formed thinner than the core sheet (10) ”relative to the thin wall portion (15). Is used as a generic term for the configuration in which the thickened portion is the thickened portion, and the thickened portion of various thicknesses is thickened according to the purpose, required performance, etc. The part (14) can be selected and adopted as appropriate It is logical.
In addition, the shape of the thin portion 15 is also represented by a trapezoidal shape whose width in the circumferential direction becomes wider toward the outer peripheral edge, but various shapes such as a mountain shape and a fan shape are taken into consideration while taking into consideration the production surface of plastic deformation processing. Of course, it can be selected and adopted. Since this thin part 15 contributes to winding of the core sheet 10, it is preferable that it is a shape where the width | variety of the circumferential direction becomes wide as an outer periphery, even if it is any shape.

  Although the eight embodiments and the modifications thereof have been described in detail, the features and special effects of the present invention will be described in accordance with the claims (especially claims 2 to 20) described in the claims. The summary is as follows.

(1) In Claim 2, the stator core E (laminated core 1) is characterized in that a plurality of thick portions 14 are arranged in a circumferential direction of the laminated core 1 over a range of 180 degrees or more < Each of the above embodiments>.
Since the laminated core 1 having this configuration supports the entire circumference of each winding layer with the thick portion 14 over a wide range of 180 degrees or more, each winding layer can maintain a stable posture without being inclined, and the end face of the laminated core 1 as a whole They can be kept parallel to each other. Therefore, for example, stress on the assembly bolt F and the housing H is reduced.
(2) In Claim 3, the stator core E (laminated core 1) is characterized in that the thick portion 14 and the thin portion 15 are arranged at equal intervals in the circumferential direction of the laminated core 1 <Examples>
According to such a configuration, when the core sheet 10 is wound spirally, bending occurs along the thin portion 15, so that the thick portion 14 and the thin portion 15 are evenly arranged over the entire circumference, thereby stacking layers. The winding curvature of the core 1 as a whole is averaged and equalized. Therefore, it is possible to contribute to the roundness of the laminated core 1 and, for example, the clamping and fixing force shared by the housing H that clamps and fixes the laminated core 1 is also equal in the circumferential direction.

(3) In claim 4, the stator core E (laminated core 1) has the thick portion 14 and the thin portion 15 formed in the yoke portion 13 corresponding to the arrangement positions of the teeth portion 11 and the slot portion 12, respectively. ing. That is, the thick portion 14 is arranged at the same position as the tooth portion 11 and the thin portion 15 is arranged at the same position as the slot portion 12 (for example, Embodiments 1 and 2).
According to the said structure, since the thick part 14 exists reliably behind the teeth part 11, the support rigidity of the teeth part 11 as the lamination | stacking core 1 increases, and it becomes difficult to move with respect to the attraction | suction force of the rotor GR. It can also contribute to magnetic sound reduction.
(4) In claim 5, the stator core E (laminated core 1) has the thick portion 14 and the thin portion 15 formed in the yoke portion 13 so as to correspond to the arrangement positions of the slot portion 12 and the tooth portion 11, respectively. ing. That is, contrary to the configuration of (3) above, the thick portion 14 is arranged at the same position as the slot portion 12 and the thin portion 15 is arranged at the same position as the teeth portion 11 <For example, Example 3>.
According to the above configuration, the effective magnetic path area in the vicinity of the slot portion where the magnetic flux density increases in the yoke portion 13 is not sacrificed.
(5) As in claim 6, in the stator core E (laminated core 1), the number of thin portions 15 may be less than the number of slots 12 or teeth portions 11.
Even if it does in this way, in the yoke part 13, it can reduce that an effective magnetic path area is sacrificed.

(6) In claim 7, the stator core E (laminated core 1) has a thin portion 15 formed on the yoke portion 13 so as to correspond to the arrangement positions of both the slot portion 12 and the tooth portion 11. Features <e.g., Modification (2) and Example 6 of Example 4>.
According to the said structure, since the number of the thin parts 15 can be increased twice, there are few fluctuation | variations by the site | part of the winding curvature of the laminated core 1 whole, and roundness can be improved further.
(7) In claim 8, in the stator core E (laminated core 1), in the configuration of (6), the radial width of the thin portion 15 corresponding to the arrangement position of the slot portion 12 is O, and the teeth portion 11 When the radial width of the thin portions 15 corresponding to the arrangement position is defined as P, the relational expression of O <P is satisfied <Examples 4 and 6>, for example.
According to the above configuration, the effective magnetic path area in the vicinity of the slot portion where the magnetic flux density increases in the yoke portion 13 is not sacrificed.
(8) In claim 9, in the stator core E (laminated core 1), the thin wall portion 15 corresponding to the arrangement position of the slot portion 12 has a radial width O equivalent to the radial width Q of the yoke portion 13. In addition, it is characterized in that it has a groove shape that forms a cooling passage 2 that connects the inner peripheral side and the outer peripheral side of the laminated core 1 <for example, Examples 2, 4, 5>.
According to the above configuration, cooling air can be taken into the slot portion 12 from the outer periphery of the laminated core 1 by the cooling passage 2 to cool the stator coil D, and loss due to heat generation of the stator coil D can be reduced. Can do.

(9) In claim 10, the stator core E (laminated core 1) has both ends facing toward the outer peripheral edge of the laminated core 1 in a virtual cross section in which the thin portion 15 is cut along the radial direction. The taper part 15a of the double-sided taper shape gradually decreasing from <Example 1 etc. except Example 5> is characterized.
(10) In claim 11, the stator core E (laminated core 1) has one end face with the plate thickness toward the outer peripheral edge of the laminated core 1 in a virtual cross section where the thin portion 15 is cut along the radial direction. A taper portion 15c having a single-side taper shape that gradually decreases from only the side is characterized in that <Embodiment 5 and its modification>.
According to the configurations of (9) and (10) above, the thin-walled portion 15 tends to be plastically deformed toward the outer peripheral edge that contributes to increasing the winding peripheral length, so that each winding layer is favorably rounded into a circular shape. Can do.

(11) In claim 12, the stator core E (laminated core 1) is provided with the notches 3 in the core sheet 10 on both sides of the thin portion 15, and the notches 3 are formed in the thin portion 15. <Example 6> is characterized in that the plastic deformation region is defined.
According to the above configuration, since the plastic deformation region of the thin portion 15 can be defined by the notch 3, a predetermined plate thickness can be secured in the thick portion 14 over the entire region. Therefore, the rigidity of the outer peripheral part of the laminated core 1 can be strengthened.

(12) In claim 13, the stator core E (laminated core 1) E is composed of a pair of laminated cores 1, and the laminated core 1 is a tapered portion in which all the thin portions 15 are tapered on one side. 15e, and arranged on the core sheet 10 so that the taper side is the same side, one end in the laminating direction forms a flat end surface, and the flat end surfaces of the pair of laminated cores 1 are fixed to each other. <Embodiment 7> characterized in that it is provided as a mounting surface of the core iron core E (surface that is sandwiched and fixed by the housing H).
According to the above configuration, since the mounting surface of the stator core E and the housing H can be brought into close contact with the entire circumference, moisture and the like can be surely prevented from entering from the mounting surface, and the anticorrosion function is exhibited. can do.

(13) In the fourteenth aspect, the thin portion 15 formed by plastic deformation on the yoke portion 13 of the core sheet 10 is composed of a thin portion 15E composed of a plurality of ridges 15f extending in the radial direction. <Example 8>.
According to the said structure, the hardness (strength) of thin part 15E itself can be raised by what is called work hardening by providing the uneven | corrugated strip 15f. As a result, the regions where the thickness is relatively large between the thin portions 15E (the regions of the thick portions 14) and the regions of the thin portions 15E whose strength has been increased by work hardening are alternately arranged in the circumferential direction. The intensity distribution in the circumferential direction of the laminated core 1 can be adjusted.

(14) In the fifteenth aspect, the thin-walled portion 15E is characterized in that the patterns of the plurality of concave and convex strips 15f are partially different <variation example (1) of the eighth embodiment>.
(15) In claim 16, the thin-walled portion 15E has a single-sided taper shape in which the plate thickness gradually decreases from only one end surface toward the outer peripheral edge of the laminated core 1 in a virtual cross section cut along the radial direction. None and is formed over both surfaces of the core sheet 10, and the pattern of the plurality of concave and convex strips 15 f is different between one surface side and the other surface side of the core sheet 10 <Example Eighth Modification (2)>.
According to the configurations of (14) and (15) above, the strength increase region due to work hardening is concentrated or dispersed at any position in the circumferential direction of the laminated core 1 to appropriately adjust the strength distribution of the laminated core 1. be able to.

(16) In claim 17, the thin portion 15E is formed by a plurality of concave and convex strips 15f so that the thickness of the thin portion 15E gradually decreases from both ends in the circumferential direction toward the center. <Example 8>.
(17) In claim 18, in the plurality of concave and convex strips 15f, the circumferential interval X between adjacent concave and convex strips 15f is smaller than the circumferential interval Y between adjacent thin portions 15E. Characteristic <Example 8>.
(18) In the nineteenth aspect, the plurality of concave and convex strips 15f are characterized in that the lengths in the radial direction are different <Example 8>.
(19) In claim 20, the plurality of concave and convex strips 15f are characterized in that the radial length of the concave and convex strips 15f located on both ends in the circumferential direction is the shortest <Embodiment 8>.
According to the configurations (16) to (19), the strength increase due to work hardening in each thin portion 15E can be adjusted as appropriate, and the degree of freedom in design is further improved.

  In the above embodiment, the case where the present invention is applied to a stator core of an automotive alternator (alternator) has been described. However, the present invention is not limited to this, and a strip-shaped core sheet made of a magnetic plate is used as the core material. The present invention can be applied to a rotating electric machine having a stator core, for example, a high voltage drive motor, and achieve the same effects.

  DESCRIPTION OF SYMBOLS 1 ... Laminated core, 10 ... Core sheet, 11 ... Teeth part, 12 ... Slot part, 13 ... Yoke part, 14 ... Thick part (non-thickness reduction part), 15 ... Thin part (thickness reduction part), D ... stator coil, E ... stator core, E4 ... plate thickness change region (thick part and thin part), G ... automotive alternator (rotary electric machine).

Claims (20)

A belt-shaped core sheet (10) made of a magnetic plate is used as the iron core material, and a cylindrical shape having teeth (11) and slots (12) for winding the stator coil (D) on the inner peripheral side. In the stator core (E) of the rotating electrical machine composed of the laminated core (1),
The core sheet (10) has the teeth portion (11) and the slot portion (12) on one side in the length direction, and the teeth portion (11) and the slot portion (on the other side in the length direction). 12) having a yoke part (13) for connecting the parts at a predetermined pitch;
The laminated core (1) is formed into a cylindrical shape by winding the core sheet (10) spirally so that the yoke portion (13) is on the outer peripheral side,
The core sheet (10) includes a thick part (14) having a thickness equivalent to the thickness of the core sheet (10) in the yoke part (13), and the core sheet (10) by plastic deformation. Thin wall portions (15) formed thinner than the plate thickness of the laminated core (1) are arranged so as to be alternately positioned in the circumferential direction on the outer peripheral side of each winding layer of the laminated core (1),
The thin-walled portion (15) is plastically deformed in the process of forming the laminated core (1) into a cylindrical shape,
The thick portions (14) are aligned in the stacking direction of the stacked core (1), and are stacked in close contact with each other over the entire surface including the outer peripheral edge in each winding layer of the stacked core (1). A stator core (E) for a rotating electrical machine, characterized in that: In the stator iron core (E) of the rotating electrical machine according to claim 1,
The stator core (E) of the rotating electrical machine, wherein a plurality of the thick portions (14) are arranged over a range of 180 degrees or more in the circumferential direction of the laminated core (1). In the stator iron core (E) of the rotating electrical machine according to claim 1 or 2,
The stator core (E) of the rotating electrical machine, wherein the thick part (14) and the thin part (15) are arranged at equal intervals in the circumferential direction of the laminated core (1). In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 3,
The thick part (14) corresponds to the arrangement position of the teeth part (11), and the thin part (15) corresponds to the arrangement position of the slot part (12), respectively, and the yoke part (13). A stator core (E) for a rotating electrical machine, wherein the stator core (E) is formed. In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 3,
The thick part (14) corresponds to the arrangement position of the slot part (12), and the thin part (15) corresponds to the arrangement position of the teeth part (11), respectively, and the yoke part (13). A stator core (E) for a rotating electrical machine, wherein the stator core (E) is formed. In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 5,
The stator core (E) of the rotating electrical machine, wherein the number of the thin-walled portions (15) is less than the number of the slot portions (12) or the teeth portions (11). In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 3,
The thin-walled portion (15) is formed in the yoke portion (13) so as to correspond to the arrangement positions of both the slot portion (12) and the teeth portion (11). Child iron core (E). In the stator iron core (E) of the rotating electrical machine according to claim 7,
The radial width of the thin wall portion (15) corresponding to the arrangement position of the slot portion (12) is O, and the radial width of the thin wall portion (15) corresponding to the arrangement position of the tooth portion (11) is P. A stator core (E) for a rotating electrical machine characterized by satisfying a relational expression of O <P when defined. In the stator iron core (E) of the rotating electrical machine according to any one of claims 4, 6, 7 and 8,
The thin portion (15) corresponding to the arrangement position of the slot portion (12) has a radial width (O) equivalent to the radial width (Q) of the yoke portion (13), and A stator core (E) for a rotating electrical machine, characterized in that it has a groove shape that forms a cooling passage (2) that connects the inner peripheral side and the outer peripheral side. In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 9,
The thin-walled portion (15) has a double-sided taper shape in which the plate thickness gradually decreases from both end surfaces toward the outer peripheral edge of the laminated core (1) in a virtual cross section cut along the radial direction. A stator core (E) of a rotating electric machine characterized by In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 9,
The thin-walled portion (15) has a one-side tapered shape in which a plate thickness gradually decreases from only one end surface toward the outer peripheral edge of the laminated core (1) in a virtual cross section cut along the radial direction. A stator core (E) for a rotating electrical machine, characterized in that: In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 11,
The core sheet (10) is provided with notches (3) located on both sides of the thin part (15), and the notch (3) defines a plastic deformation region of the thin part (15). A stator core (E) of a rotating electric machine characterized by being partitioned. In the stator iron core (E) of the rotating electrical machine according to claim 11,
This stator core (E) is composed of a pair of laminated cores (1),
The laminated core (1) is arranged on the core sheet 10 so that all the thin portions (15) are tapered on one side and the tapered side is the same side, so that one side in the lamination direction is flat. End face (F) is formed,
The pair of laminated cores (1) has a stator core (E) for a rotating electrical machine in which the flat end faces (F) are provided as mounting surfaces for the stator core (E). In the stator iron core (E) of the rotating electrical machine according to any one of claims 1 to 13,
The thin-walled portion (15) formed by plastic deformation is composed of a thin-walled portion (15E) composed of a plurality of concavo-convex ridges (15f) extending in the radial direction. E). In the stator iron core (E) of the rotating electrical machine according to claim 14,
The thin-walled portion (15E) is a stator core (E) for a rotating electric machine, wherein a pattern of the plurality of concave and convex portions (15f) is different in some thin-walled portions (15E). In the stator iron core (E) of the rotating electrical machine according to claim 15,
The thin-walled portion (15E) has a single-sided taper shape in which a plate thickness gradually decreases from only one end surface toward the outer peripheral edge of the laminated core (1) in a virtual cross section cut along the radial direction. ,
Formed over both sides of the core sheet (10),
The stator core (E) for a rotating electrical machine, wherein the patterns of the plurality of concave and convex strips (15f) are different on one surface side and the other surface side of the core sheet (10). In the stator iron core (E) of the rotating electrical machine according to any one of claims 14 to 16,
The thin-walled portion (15E) is formed by the plurality of concave and convex strips (15f) so that the thickness of the thin-walled portion (15E) gradually decreases from both ends in the circumferential direction toward the center. The stator core (E) of the rotating electrical machine. In the stator iron core (E) of the rotating electrical machine according to any one of claims 14 to 17,
In the plurality of concavo-convex ridges (15f), the circumferential interval (X) of the adjacent ridges (15f) is greater than the circumferential interval (Y) of the adjacent thin portions (15, 15E). A stator core (E) of a rotating electrical machine characterized by being reduced in size. In the stator iron core (E) of the rotating electrical machine according to any one of claims 14 to 18,
The stator core (E) of the rotating electrical machine, wherein the plurality of concave and convex strips (15f) have different lengths in the radial direction. In the stator iron core (E) of the rotating electrical machine according to claim 19,
The stator core (E) for a rotating electrical machine, wherein the plurality of concave and convex strips (15f) have the shortest radial length of the concave and convex strips (15f) positioned on both ends in the circumferential direction.

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