JP2010284008A - Stator core of rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core which allows easy helical lamination even if a rear band part 5 of a core sheet 7 is widened and made thinner, enlarges a tooth width to reduce a magnetic resistance, and enhances rigidity to eliminate gaps at a tooth part at the time of lamination, resulting in reduced magnetic noise. <P>SOLUTION: A slot-depth part gather 8, bent into a chevron shape is formed at a slot depth part 12a on the inner peripheral side of the rear band part 5, in such a manner that a bending angle of chevron becomes smaller as advancing toward the outer peripheral side along the radial direction to provide a predetermined slot width. At tooth part 4, each tooth part gather 10 is bent in an chevron shape, along the radial direction at the same bending angle as well. The bending angle of chevron is formed to be smaller as advancing toward the outer peripheral side, so that the pitch length at inner peripheral and outer peripheral sides of the rear band part 5 comes to a predetermined winding pitch length of a lamination core 6. Furthermore, the rear band parts 5 and the tooth parts 4 facing the lamination core 6 are laminated in contact with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stator core of a rotating electrical machine, and is particularly suitable for application to a helical laminated core.

[Conventional technology]
Conventionally, as a stator core for rotating electrical machines, instead of a laminated core that is formed by punching steel plates into a ring shape and laminating many sheets into a cylindrical shape, a belt-shaped core sheet formed by pressing a magnetic tooth shape is spiral. A helical laminated core formed by laminating a large number of cylinders while being wound around (helical) is employed for the reason of good yield.

  The helical laminated core (hereinafter referred to as the laminated core or simply the core) is wound around the outer periphery of the sheet while thinning the sheet thickness direction of the outer periphery of the back band on the side opposite to the teeth of the core sheet with a rolling roll or the like. There are some which are wound helically by increasing the circumference (hereinafter referred to as the outer winding type). In addition, a gathering that is a triangular mountain-shaped fold is provided in the thickness direction of the inner peripheral portion of the back belt portion on the teeth side of the core sheet to shorten the winding peripheral length (pitch) of the inner peripheral portion of the seat. (Hereinafter referred to as gather type) (for example, see Patent Document 1). Further, one side in the width direction of the belt-shaped core sheet is deformed into a wave shape, and the wave height of a portion expanded into one wave shape is crushed to the plate thickness, and the winding circumference is lengthened and wound (hereinafter referred to as a crushing type) (Refer to Patent Document 2, for example).

[Problems with conventional technology]
By the way, in recent years, with the increasing needs for higher output and higher efficiency of rotating electrical machines, the need for a low iron loss core is high. In addition, with the aim of increasing the size of the stator core and reducing iron loss due to eddy currents, steel sheet thinning has been promoted. When the back belt part of the laminated core becomes wider as the size of the body increases, the outer peripheral winding type using a rolling roll or the like causes plastic deformation in the direction of elongation of the core sheet material on the outer peripheral side compared to the inner peripheral side of the back belt part. Tends to increase more. The thinned core sheet lacks the necessary material flow, and may not be wound to a predetermined curvature or may crack.

  Further, in the gather type, the thickness along the stacking direction of the bent portion in the back band portion of the core sheet is perpendicular to the stacking direction other than the bent portion because the bent portion is inclined with respect to the stacking direction. As a result, there is a gap along the stacking direction in the folded part, and the influence of this gap reduces the rigidity of the teeth part that has a free end on one side. There is concern that magnetic sound will increase.

JP 2005-269691 A JP-A-53-100406

  Even under conditions where the back strip of the core sheet is widened and thinned, making it difficult to manufacture helically laminated cores, it is easy to bend by thinning the plate. Attached to provide a significant difference in the circumference of the inner and outer circumferences of the back belt part, making it easier to wind helically, and increasing the tooth width (cross-sectional area) in the teeth part circumferential direction due to the bent shape to lower the magnetic resistance, In addition, it is possible to provide a stator core capable of reducing magnetic noise by increasing the rigidity of a tooth portion having a free end on one side to make it difficult to be deformed and further laminating the tooth portions without causing any gaps in the stacking direction. Is an important issue.

  Therefore, the present invention has been made to solve the above-described problems, and the helical lamination can be performed even under conditions where it is difficult to manufacture a helical laminated core by making the back strip of the core sheet wider and thinner. The purpose is to provide a stator core that is easy, increases the teeth width, lowers the magnetic resistance, increases the rigidity, eliminates gaps in the teeth when laminating, and can reduce magnetic sound at low cost. And

[Means of Claim 1]
According to the means of claim 1, the belt-shaped core sheet in which the teeth portion that forms the magnetic poles and the back belt portion that connects the teeth portions at equal pitches are press-molded is spirally wound into a cylindrical shape The helical laminated core is formed by laminating and forming a slot portion between the teeth on the inner peripheral side of the core sheet, and the slot portions arranged on the inner peripheral side of the core sheet are externally oriented along the radial direction. At least one back belt bent portion in which the back belt portion is folded in a mountain shape along the core radial direction is formed in the inner part of the slot that defines the radial side, and the back belt bent portion is the slot portion. In the slot, the width in the inner part of the slot adjacent to the boundary with the back belt part becomes the predetermined slot width of the laminated core, and the length per slot pitch in the longitudinal direction of the outer part of the back belt part opposite to the slot is laminated. In the core outer periphery of the core It is formed so that the mountain-shaped bends become smaller along the core radial direction of the laminated core from the inner peripheral side to the outer peripheral side along the core radial direction of the laminated core. The teeth folded portion is formed by bending the teeth portion and the back belt portion in a mountain shape along the core radial direction, and the teeth folded portion is formed by continuously forming the bent portions of the teeth portion and the back belt portion in a straight line. In addition, it is formed at the same bending angle as the back band bent portion, and the teeth bent portion has a width of the tooth portion, a pitch between the teeth portions in the slot side inner peripheral portion of the back belt portion, and a pitch between the slot portions. In addition to the predetermined dimension value of the laminated core, the length per slot pitch in the longitudinal direction in the outer peripheral portion of the back strip opposite to the slot becomes the length per slot pitch in the core outer peripheral portion of the laminated core. Is characterized by folding a mountain type is formed so as to become smaller toward the outer peripheral side of the Setai portion.

  As a result, it becomes possible to obtain a large winding circumference difference by two types of folding gathers between the back band bent portion and the teeth bent portion in the inner part of the slot. Even when the helical laminated core is difficult to produce, such that the core sheet is thinned, the helical laminated core can be easily wound with high accuracy.

  In addition, the cross-sectional area in the circumferential direction of the teeth portion can be increased by forming a bent shape in the teeth portion even if the width dimension in the core is the same as that in the prior art, and it is possible to reduce the magnetic resistance. A laminated core is easily obtained. Moreover, since the bending angle of the teeth bent portion is the same as that of the back belt bent portion, the axial height of the teeth portion is substantially the same without protruding from the back belt portion. Therefore, since the gap between the crests or troughs and the rotor on both end faces of the laminated core as viewed in the laminating direction is not widened, it is possible to increase the degree of design freedom that can increase the permeability together with the circumferential cross-sectional area. Furthermore, the bending rigidity of the teeth portion is increased by bending the teeth portion, and the lamination core is also increased in rigidity by suppressing the increase in vibration and noise.

[Means of claim 2]
According to the means of claim 2, in each of the back band part and each tooth part facing each other of the helical laminated core, each back band bent part and each tooth bent part are laminated in contact with each other. It is characterized by.

  Thereby, when the thickness of the core sheet is constant in the longitudinal direction, the core sheets are stacked in close contact with each other, so that there is no gap between the stacked cores of the teeth folded portion, and the core rigidity is dramatically increased, An increase in vibration and noise can be significantly suppressed, and a magnetic resistance can be reduced by a gap, so that a highly efficient laminated core can be obtained.

[Means of claim 3]
According to the third aspect of the present invention, the back belt peripheral portion is an outer peripheral region having an outer radius equal to or larger than an arbitrary radius of the back belt portion of the helical laminated core, and the back belt peripheral portion is flat without any bent portions. It is characterized by being.

  This makes it possible to take advantage of the gather type, which winds up the laminated core by bending, and the conventional outer winding type, which winds up the laminated core by extending the winding peripheral length by circumferential tensile plastic deformation. It is also possible to cope with a stator core of a rotating electrical machine having a wider part, and it is possible to configure with a minimum degree of gathered bending. Moreover, since it can extend in a flat shape in the circumferential direction, the proof stress can be increased with respect to a circumferential expansion / contraction action force such as a magnetic reaction force compared to a bent shape, and thus a magnetic sound reduction effect can be achieved. In addition, since the layers are closely stacked in the axial direction, a sufficient holding force can be maintained during the fastening in the axial direction, and manufacturing can be performed easily and at low cost.

[Means of claim 4]
According to the means of claim 4, the back band peripheral part of the back band part of the helical laminated core extends obliquely in the radial direction with respect to a plane perpendicular to the axial direction of the helical laminated core. It is characterized by forming a band inclined portion.
This makes it possible to shorten the peripheral length of the back belt peripheral portion by inclining the back belt inclined portion, and to reduce the thickness reduction amount due to outer peripheral tensile plastic deformation even in the case of a wide laminated core of the back belt portion. Can be prevented.

[Means of claim 5]
According to the fifth aspect of the present invention, in the respective back belt portions facing each other of the helical laminated core, the back belt slant portions are laminated in contact with each other.
Thereby, since it laminates | stacks closely in a plane form to an axial direction, sufficient holding force can be maintained at the time of the axial fastening.

[Means of claim 6]
According to the means described in claim 6, the belt-shaped core sheet formed by press-forming the tooth portion that forms the magnetic pole and the back belt portion that connects the tooth portions at an equal pitch is spirally wound into a cylindrical shape. In the helical laminated core formed by laminating and forming a slot portion between the teeth on the inner peripheral side of the core sheet, in the teeth arranged on the inner peripheral side of the core sheet, the teeth and the backband are A folded portion of teeth is formed that is bent in a mountain shape along the core radial direction. The folded portion of the teeth is formed by continuously forming a bent portion of the teeth portion and the back belt portion. The bent portion includes the width of the teeth portion, the pitch between the teeth portions in the slot side inner peripheral portion of the back belt portion, and the pitch between the slot portions are the predetermined dimension values of the laminated core, and 1 in the longitudinal direction The length per lot pitch is the length per slot pitch in the core outer peripheral portion of the laminated core, and it is formed such that the mountain-shaped bend becomes smaller toward the outer peripheral side of the back belt portion. .

  As a result, only one set of teeth bending portions in the teeth portion can be wound as necessary and a helical laminated core having a predetermined curvature can be manufactured easily and at low cost. In addition, by forming the teeth portion in a bent shape, the cross-sectional area in the circumferential direction of the teeth portion can be further increased, the magnetic resistance can be greatly reduced, and a more efficient laminated core can be easily obtained. Furthermore, the bending rigidity of the teeth portion is increased by bending the teeth portion, and the lamination core is also increased in rigidity by suppressing the increase in vibration and noise.

A stator core is shown, (a) is a top view, (b) is AA sectional drawing (Example 1). A part of manufacturing procedure of a stator core is shown, (a) is a partial plan view and a side cross-sectional view of a press-formed core sheet, (b) is a partial plan view and a side cross-sectional view showing a slot inner back gather It is a figure, (c) is the fragmentary top view and side sectional drawing which show the teeth part gather, (d) is BB sectional drawing. (Example 1). It is an expansion detailed perspective view of D section of Drawing 1, (a) shows teeth part gather and slot inner part gather (Example 1), (b) shows teeth part gather and slot inner part gather ( (Other modification of Example 1), (c) shows only teeth part gathers (Modification 1 of Example 1). A stator core is shown, (a) is a top view, (b) is CC sectional drawing (Example 2). It is an expansion detailed perspective view of the E section of Drawing 4, (a) shows teeth part gather, slot inner part gather, and back belt inclination part (example 2), and (b) teeth part gather and back belt inclination. (Modification 2 of Example 2) is shown.

  The best mode of the present invention will be described together with Example 1 shown in the drawings.

[Configuration of Example 1]
FIGS. 1-3 show Example 1 according to the present invention, FIG. 1 shows the overall configuration of the stator core of the present invention, (a) is a plan view, and (b) is AA. It is sectional drawing. FIG. 2 shows a part of the manufacturing procedure of the stator core, wherein (a) is a partial plan view and a side cross-sectional view of the press-molded core sheet, and (b) is a slot inner part gather. It is a fragmentary top view and side surface sectional drawing, (c) is a fragmentary top view and side surface sectional drawing which show a teeth part gather, (d) is BB sectional drawing in a teeth base end part. FIG. 3 is an enlarged detailed perspective view showing the gathered structure of the D part of the stator core. FIG. 3 (a) shows the full width of the back belt part of the two gathered structures of the teeth gather and the inner gather in the slot. (B) shows the case where the gathers are formed over the entire width of the back belt part of the two gather structures of the teeth part gather and the back part gather in the slot, (b) c) A gather structure of only one set of teeth part gathers.

  As shown in FIG. 1, the stator core 3 includes a plurality of teeth 4 serving as magnetic poles and a belt-shaped core sheet 7 formed by press-molding a backband 5 that connects and holds the teeth 4 at an equal pitch. It is composed of a helical laminated core 6 in which a large number of cylinders are laminated while being wound around (helical). A plurality of slots 12 are formed on the inner peripheral portion of the helical laminated core 6, and a conductor winding (not shown) is inserted into each slot 12 to form a stator. The stator is interposed between frames (not shown). A rotor (rotor) (not shown) that is fastened and fixed and works as a magnetic field is accommodated in the interior to constitute a rotating electrical machine such as an automotive alternator.

  The manufacturing method of the stator core 3 composed of the helical laminated core (hereinafter referred to as a laminated core or simply a core) 6 usually employs four processing steps. First, as shown in FIG. 2 (a), as a first step, a pressing step for forming the back strip portion 5 while press-forming the tooth portion 4 serving as a magnetic pole on the strip-shaped core sheet 7; In order to make it easy to helically wind the belt-shaped core sheet 7 formed with 4, the circumferential length on the anti-teeth side of the back belt portion 5 of the belt-shaped core sheet 7 is increased, or the circumferential length on the teeth side is shortened. Then, a winding process for laminating a large number of sheets in a cylindrical shape, and then, although not shown in the drawing, align each of the large numbers of the laminated cores 6 in the radial direction and the circumferential direction, and finely adjust the deviation to an allowable range. And a welding process for fixing the outer periphery of the core by welding so as not to promote displacement, and further ironing to maintain a predetermined shape such as the roundness of the core outer diameter and the concentricity with respect to the core inner diameter It consists of a finishing process.

  A good stator core 3 is manufactured through such a series of steps. In addition, this manufacturing method has high yield and productivity, and can reduce costs. In this embodiment, the name of the stator core 3 refers to a finished product that has been finished in a predetermined shape in the finishing process of the final process. From the form, it is called the laminated core 6. Therefore, the stator core 3 and the laminated core 6 have the same substance, but simply call out the difference between a finished product and a semi-processed product. In addition, when the welding process or finishing process becomes unnecessary due to the improvement of processing or assembly accuracy, the laminated core 6 becomes the stator core 3 as it is, and the welding process and finishing process are applied as necessary. Process.

  In the present embodiment, in the above-described second winding process, when the helical winding is performed, two types of gathers, a gather that bends at the slot position and a gather that also bends at the tooth position, are provided, and the back belt portion 5 is characterized in that the winding peripheral length (pitch length) on the inner peripheral side of 5 is shortened to facilitate winding. Hereinafter, it will be described in detail with reference to FIG. In the following description, in order to make it easy to understand the configuration of the two gathers, the gather at the slot position and the gather at the tooth position, the explanation will be divided into procedures for independently processing the two gathers. The actual work is preferably processed at the same time and simultaneously. Therefore, the gathered bent shape during processing may not necessarily be the shape shown below.

  As shown in FIG. 2A, the core sheet 7 includes a plurality of tooth portions 4 and a back belt portion 5. Each tooth portion 4 has a predetermined tooth shape in which a tooth tip portion 4a serving as a free end thereof is tapered, and has a tooth width and a tooth so as to have a developed length before being folded and stacked helically. It is press-molded by forming a wide slot portion 12 having a wide inter-part pitch and spreading toward the tooth tip 4a side.

And each teeth part 4 is connected with the sheet | seat inner peripheral part 5a of the back belt part 5 in the teeth base end part 4b, and the seat inner periphery used as the boundary with the back band part 5 between each teeth base end part 4b. A slot inner back part 12a adjacent to the part 5a is formed, and the slot inner back part 12a is a part that divides the outer diameter side in the direction along the core radial direction of the slot part 12 on the inner peripheral side of the back band part 5. .
Further, the non-slot side of the seat inner peripheral portion 5a of the back belt portion 5 constitutes a seat outer peripheral portion 5b, and when the core sheet 7 is helically wound and laminated in a cylindrical shape, the core outer peripheral portion of the laminated core 6 It will be.

  Then, as shown in FIG. 2 (b), the slot inner back portion 12 a side of the back belt portion 5 is first bent into a triangular mountain shape by a folding device (not shown), and the back belt bent portion (hereinafter referred to as the slot inner portion). 8) is formed. The triangular chevron is the largest on the inner back part 12a side of the slot, is uniformly reduced toward the seat outer peripheral part 5b side, and is formed up to the seat outer peripheral part 5b serving as the outer peripheral end of the back band part 5 in the width direction. finish. Thereby, a predetermined circumferential length difference is formed between the seat outer peripheral portion 5b and the seat inner peripheral portion 5a of the back belt portion 5.

  Here, the end position of the triangular mountain-shaped folding that uniformly decreases toward the seat outer peripheral portion 5b side is the seat outer peripheral portion 5b that reaches the entire width of the back belt portion 5, or the entire width is reduced. The process may be finished after exceeding, and is applied in accordance with a necessary circumference difference between the sheet outer peripheral part 5b and the sheet inner peripheral part 5a with respect to the winding curvature (see FIG. 3B). . Further, the number of gathers 8 is not limited to one, and may be two or more as necessary, and in the case of two or more, the circumference difference can be further increased. On the other hand, if the same winding circumference difference as in the case of one piece is sufficient, each folding height can be set low, and the amount of protrusion from each core sheet reference can be reduced. it can.

  As a result, the wide slot portion 12 having the developed width forms a predetermined slot width of the laminated core 6 by the inner gathers 8 in the slot (strictly speaking, the predetermined slot width is formed) After the next teeth portion 4 is bent), the circumferential length (pitch length) on the back inner portion 12a side of the back belt portion 5 is shorter than the circumferential length (pitch length) on the seat outer peripheral portion 5b side. The helical winding can be easily performed.

  Then, as shown in FIG. 2 (c), the teeth part 4 and the back belt part 5 are bent into a triangular chevron by a folding device that can bend each tooth part 4 into a chevron. A curved portion (hereinafter referred to as teeth portion gather or simply gather) 10 is formed. The teeth part gather 10 includes a bent part (hereinafter simply referred to as a gather) 11 in which only the tooth part 4 is bent into a mountain shape, and the gather 11 extends to the back belt part 5 so that the back belt part 5 is a mountain shape. The bent portions (hereinafter simply referred to as gathers) 9 bent in a straight line form a set of gathers in a straight line.

  The gathers 11 are formed by folding in the shape of a mountain at the center of the width of the teeth portion 4, and are uniformly bent from the tooth distal end portion 4 a toward the teeth base end portion 4 b. It is configured to extend in a direction perpendicular to the direction.

  Further, the gather 9 is bent into a triangular mountain shape, similar to the above-mentioned gather 8, so that the gather 11 is continuously along the core radial direction of the seat outer peripheral portion 5b from the teeth base end portion 4b. A sheet that is the largest on the teeth base end 4b side located on the seat inner peripheral part 5a of the back band part 5 and uniformly becomes smaller toward the sheet outer peripheral part 5b side, and becomes the outer peripheral end in the width direction of the back band part 5 It has been formed up to the outer peripheral portion 5b.

  Note that the teeth portion gather 10 is not limited to being formed up to the seat outer peripheral portion 5b which is the outer peripheral end in the width direction of the back belt portion 5, but the end position of the triangular mountain-shaped folding of the gather 9 is It may be finished after exceeding the entire width of the belt part 5, that is, the folding may be formed so that the peak height of the triangular chevron fold does not become zero even at the outermost periphery, It is applied in a timely manner according to a predetermined circumferential length difference from the peripheral portion 5a (see FIG. 3B).

  As a result, the teeth width and the pitch between the teeth portions having a developed length in advance form a predetermined tooth width, a pitch between the teeth portions and a pitch between the slot portions of the laminated core 6, and a seat inner peripheral portion of the back belt portion 5. The circumferential length (pitch length) of 5a can be made shorter than the circumferential length (pitch length) of the sheet outer peripheral portion 5b, and helical winding with a larger curvature can be easily performed. At this time, since the helical winding forms the tooth portion gather 10 for each tooth portion 4, the sheet outer peripheral portion 5b forms a polygon, and the laminated core 6 wound helically also forms a polygonal cylindrical shape. .

  Here, as shown in FIG. 2D, the angle of bending of the mountain-shaped folds of the gather 8 and the gather 9 at an arbitrary radial position in the core radial direction is formed to be the same. This is because one side can be made larger and the other side can be made smaller. However, since the folding heights of both are substantially equal, the outer periphery of the sheet at an arbitrary radial position necessary for winding the laminated core 6 with each other. The amount of protrusion from the core sheet reference that results in half the difference in circumference between the circumferential length (pitch length) of the portion 5b and the circumferential length (pitch length) of the sheet inner circumferential portion 5a. This is effective in reducing the overall length of the laminated core 6 and making it compact.

  Then, as shown in FIG. 3A, a predetermined number of sheets are wound up to form a laminated core 6 laminated in a cylindrical shape. The laminated core 6 thus laminated is finally finished into a predetermined shape by ironing the core outer diameter as necessary. At the time of ironing, since the gathers 8 and 9 are formed by bending the back belt portion 5, unlike the conventional outer winding type, there is no reduction in the plate thickness. The rigidity of the part 5 is increased, and a highly accurate laminated core 6 or stator core 3 can be manufactured without generating a gap between sheets.

[Effect of Example 1]
In this embodiment, the inner slot 12a on the inner circumference side of the back band 5 has a predetermined slot width of the laminated core 6 at the inner slot 12a, and the pitch length at the outer circumference on the non-slot side. Is formed so that the mountain-shaped bend is reduced along the core radial direction so as to be the pitch length of the core outer peripheral portion of the laminated core 6, and also in the teeth portion 4, the teeth portion gather 10 is formed in the inner portion of the slot. The teeth 8 are bent at the same bending angle as that of the gathers 8, and the teeth width, the pitch between the teeth and the pitch between the slots in the inner circumference of the backband 5 are the predetermined dimension values of the laminated core 6, and The pitch length at the outer periphery of the laminated core becomes the pitch length of the outer periphery of the laminated core so that the angle of the ridges decreases toward the outer circumference. In opposing the back band portion and the tooth portion is, so that each stack in contact with each other.

  As a result, even in the difficult manufacturing condition of the helical laminated core 6 in which the back belt portion 5 is widened and the core sheet 7 is thinned, the inner slot gather 8 and the tooth portion gather 10 that are simply folded are formed. By providing, it can be easily configured even with a large difference in winding circumference, and the helical laminated core 6 can be easily wound with high accuracy.

  Further, since the back belt portion 5 is simply bent to form a gather, the back belt portion 5 is improved in rigidity and the non-bent portion extends in a planar shape, and the plate thickness does not change. Thus, a highly accurate laminated core 6 that does not generate a gap between sheets can be formed, and a sufficient holding force can be maintained when the laminated core 6 is fastened and fixed in the axial direction.

  Further, by forming the bent shape in the tooth portion 4, the cross-sectional area in the circumferential direction of the tooth portion can be increased, the magnetic resistance can be reduced, and a highly efficient laminated core 6 can be easily obtained. Moreover, since the bending angle of the teeth part gather 10 was made the same as that in the slot inner part gather 8, the height in the axial direction of the tooth part 4 does not protrude from the back band part 5 and is substantially the same. Therefore, since the gap with the rotor is not widened, it is possible to increase the degree of design freedom for increasing the magnetic permeability together with the circumferential sectional area. And since close lamination is possible, the rigidity of the laminated core 6 is increased, and an increase in vibration and noise can be suppressed.

[Modification 1]
In Example 1, it is a two-gather structure type in which the back part gather 8 in the slot and the tooth part gather 10 of the teeth part 4 are further added, and the bending angle of the back part gather 8 in the slot and the teeth part gather 10 is changed. They were almost identical.

  The present modification is not limited to this, but is applied to a gather configuration in which one is large and the other is small. For example, the inner depth gather 8 in the slot is reduced and the teeth portion gather 10 remains large. In addition, if it is possible to sufficiently apply only the teeth portion gather 10 for a predetermined circumferential length difference, the slot inner depth gather 8 can be made as small as possible. The attachment of the part gathers 8 may be stopped, and only the teeth part gathers 10 may be configured (see FIG. 3C).

  Therefore, the degree of freedom in setting the bending height with respect to the object such as widening of the back belt portion 5 and the magnitude of the curvature of the helical winding is improved. Even in this case, at least the manufacturing process is simplified, and the rigidity of the teeth portion 4 and the area can be increased. Therefore, a highly efficient laminated core that suppresses vibration and noise and reduces magnetic resistance. 6 is obtained.

[Configuration of Example 2]
A second embodiment of the present invention is shown in FIGS. 4A and 4B show the stator core, where FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along the line C-C. FIG. 5 is an enlarged detailed perspective view showing the gather structure of the E part in FIG. 4, (a) shows two types of gather structure of the tooth part gather and the deep gather in the slot, and the back belt inclined part, (b) Shows only one set of gathers and a back band slant. Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In Example 1, in the slot inner back part 12a on the inner peripheral side of the back band part 5 of the core sheet 7, the inner slot inner part gather 8 bent in a mountain shape is formed, and the width in the slot inner back part 12a is: The stacked core 6 is formed so that the mountain-shaped bend is reduced from the inner peripheral side toward the outer peripheral side along the core radial direction so as to be the slot width of the laminated core 6, and the teeth portion 4 also has a peak along the core radial direction. A teeth portion gather 10 bent into a mold is formed, and the teeth portion gather 10 is bent into a chevron at the same bending angle as the inner depth gather 8 in the slot, and the pitch length at the sheet outer peripheral portion 5b of the core sheet 7 is increased. The laminated core 6 is formed so as to have a pitch length in the outer peripheral portion of the core, and further, the back core portion 5 and the teeth portion 4 of the laminated core 6 that are opposed to each other are in contact with each other. It was those way.

  In the present embodiment, as shown in FIG. 4, as applied in the first embodiment, a back band that is bent into a chevron is formed in the inner slot portion 12 a of the slot section 12 on the inner peripheral side of the back band section 5. A teeth bent portion (hereinafter referred to as teeth) that forms a bent portion (hereinafter referred to as a slot inner gather or simply gather) 8 and is also bent in a chevron shape along the radial direction in the teeth portion 4. 10 is formed so that the teeth width, the pitch between the teeth on the inner peripheral side of the back band 5 and the pitch between the slots are the predetermined dimension values of the laminated core 6. Then, the gathers are finished by forming a mountain-shaped bend up to the peripheral part of the back band at an arbitrary radial position of the back band part 5 so that the pitch length in the outer peripheral part of the seat 5b becomes the outer peripheral length in the outer peripheral part of the core. The formula and this The winding peripheral length of the back belt portion 5 can be increased to a predetermined helical length by using the conventional outer winding method of winding the laminated core 6 by increasing the winding peripheral length by circumferential tensile plastic deformation of the belt peripheral portion. The helical laminated core 6 is manufactured so as to have a winding circumference.

  As shown in FIG. 4, the stator core 3 helically winds a belt-shaped core sheet 7 formed by press-forming the teeth 4 serving as magnetic poles and the backband 5 that connects and holds the teeth 4 at equal pitches. However, it consists of a helical laminated core 6 in which a large number of cylinders are laminated.

  As described in the first embodiment, as shown in FIG. 5A, the helical laminated core 6 includes a slot inner back gather 12 a in the slot inner back portion 12 a of the back belt 5 and a tooth portion 4 a tooth. In the same manner as in the first embodiment, the inner gathers 8 in the slots are folded into a triangular mountain shape on the inner back 12a side of the slot, and are the largest on the inner back 12a side. As it goes to the side of the portion 5b, it is uniformly reduced, and the back belt portion 5 is formed up to the peripheral portion of the back belt at an arbitrary radial position. Thereby, a predetermined slot width of the laminated core 6 is formed.

  Further, the teeth portion gather 10 includes a bent portion (hereinafter simply referred to as a gather) 11 in which only the teeth portion 4 is bent, and the gather 11 extends to the back belt portion 5 so that the back belt portion 5 A bent portion (hereinafter simply referred to as a gather) 9 that is bent into a chevron shape is formed in a straight line to form a set of gathers. Teeth base end which is bent into a triangular mountain shape and is located on the seat inner peripheral portion 5a of the back belt portion 5 in the same manner as the gathers 8 along the core radial direction of the seat outer peripheral portion 5b from 4b. It is largest on the side of the part 4b, uniformly becomes smaller toward the seat outer peripheral part 5b side, and is formed up to the back band peripheral part at an arbitrary radial position of the back band part 5. Thereby, the predetermined teeth width of the laminated core 6, the pitch between teeth parts, and the pitch between slot parts are formed.

  The slot inner gather 8 and the teeth gather 10 are both formed to have a predetermined slot width, teeth width, and pitch length by shortening the winding pitch length on the inner peripheral side of the back band portion 5 to wind up. Although it is easily wound up helically, in this embodiment, before the folding of the two inner gathers 8 and the teeth gathers 10 in the two slots, or at the same time as the folding, at any radial position of the back band 5. For example, by making the plate thickness of the peripheral portion of the back belt thinner by plastic deformation of a rolling roller or the like, the winding peripheral length is made longer and flattened to make the winding easier. At this time, the plastic deformation of the peripheral part of the back band is processed so as to form a back band inclined part 5c that is uniformly inclined in the radial direction with respect to a plane perpendicular to the core axis direction and extends conically. By doing so, the outer peripheral pitch diameter of the outermost periphery due to the inclination of the outermost periphery becomes small, and thereby the thickness reduction is small, that is, the reduction amount can be reduced.

  Therefore, by applying the gathers 8 and 9 formed in the slot inner back part 12a and the teeth base end part 4b of the back belt part 5 to the seat inner peripheral part 5a of the back belt part 5 in the constant back belt full width, Since the pitch length on the peripheral side can be shortened, it is not necessary to increase the peripheral length of the back band inclined portion 5c on the outer peripheral side. On the other hand, even if the folding height of the gathers 8 and 9 is low, winding is performed. Is easy.

  This means that there is little decrease in the thickness of the outer peripheral plate in the back band inclined part 5c, there are few gaps between the back band inclined parts 5c in the stacking direction, and the rigidity of the stacked core 6 is improved. There is little circumference difference in the circumference, the height of the chevron can be lowered, the gap between the rotors on the core end face is not increased, and the performance is hardly lowered. In other words, even when the back belt portion 5 is widened and the winding curvature is increased, it is possible to take advantage of the gather type and the conventional outer circumference winding type, and both can be reduced without high-load machining. Load machining enables high-speed work speeds, improving productivity and reducing production costs.

  Further, as shown in FIG. 5 (a), the back belt inclined portion 5c is a flat surface that extends uniformly in a conical shape with a uniform inclination in the radial direction with respect to a plane perpendicular to the axial direction of the laminated core 6. It becomes a structure. Therefore, even if a magnetic reaction force acts on the laminated core 6, the laminated core 6 is subjected to an external force in the radial direction, and as a result, expands and contracts in the circumferential direction. At this time, compared with the gathered bent shape along the circumferential direction. The flat structure extending in a conical shape can increase the rigidity against expansion and contraction.

  In addition, the thickness of the peripheral part of the back belt is less reduced compared to the single use of the conventional outer winding type, and the structure that is uniformly inclined and extends in a conical shape is a flat that does not be inclined and conical. Since the outer peripheral pitch diameter becomes smaller and the outer peripheral side extension amount is small, the reduction in the plate thickness is small. Thereby, when it becomes the lamination | stacking core 6, although each back belt inclination part 5c does not closely_contact | adhere completely, a clearance gap can be made small and rigidity can be improved, Therefore Magnetic sound can be reduced.

[Modification 2]
In the second embodiment, the winding pitch length on the inner peripheral side of the back belt portion 5 is shortened to form a mountain-shaped fold so as to obtain a predetermined slot width, pitch between slots, teeth width, and pitch between teeth. Combined with the gathering method and the conventional outer winding method in which the plate thickness of the back belt peripheral part of the back belt part 5 is made thin so that the winding circumference of the back belt peripheral part of the back belt part 5 becomes longer. Thus, the helical laminated core 6 is manufactured by making it easy to wind up helically.

  This modification is not limited to this, and it is easy to lengthen the winding circumference of the back belt peripheral portion of the back belt portion 5 by using the conventional outer periphery winding type together. It is possible to relatively reduce the degree of gathered folding height that shortens the winding circumference of the portion 5a, and rather than lowering the folding height of both of the two gathers, one is larger and the other is For example, the inner gather 8 in the slot may be made smaller, and the teeth gather 10 may be kept larger. If sufficient application at 10 is possible, the attachment of the back gather 8 in the slot may be stopped, and only the teeth gather 10 may be configured as one set (see FIG. 5B).

  Therefore, the degree of freedom in setting the bending height with respect to the object such as widening of the back belt portion 5 and the magnitude of the curvature of the helical winding is improved. Even in this case, at least the manufacturing process is simplified, and the rigidity of the tooth portion 4 can be increased and the cross-sectional area can be increased. A core 6 is obtained. Further, it is possible to take advantage of both, and the same effects as those of the second embodiment can be obtained.

[Other Examples]
In the above embodiment, the case where the stator core of the rotating electrical machine of the present invention is applied to an AC generator for a vehicle has been described. However, the present invention is not limited to this, and a rotating electrical machine having a similar stator core, for example, high voltage drive You may apply to a motor etc. and there exists the same effect.

3 Stator Core 4 Teeth Part 5 Back Belt Part 5a Seat Inner Peripheral Part 5b Seat Perimeter Part 5c Back Belt Inclined Part 6 Laminated Core (Core, Helical Laminated Core)
7 Core sheet 8 Gather (Gather inside slot, back belt fold)
9 Gather (folded part)
10 Gather (Teeth Club Gather, Teeth Folding Club)
11 Gather (folded part)
12 Slot part 12a Inside part of slot

Claims (6)

A belt-shaped core sheet formed by press-forming a tooth portion that forms a magnetic pole and a back belt portion that connects the teeth portions at an equal pitch is spirally wound and laminated into a cylindrical shape, and the inner periphery of the core sheet In the helical laminated core formed by forming a slot portion between the teeth portions on the side,
In the slot portion arranged on the inner peripheral side of the core sheet, the back belt portion is bent into a mountain shape along the core radial direction at the inner part of the slot that defines the outer diameter side in the radial direction. At least one back belt fold is formed,
The back band bent part has a predetermined slot width of the laminated core with a width in the slot inner part adjacent to the boundary with the back band part in the slot part,
Along the core radial direction of the laminated core, the length per slot pitch in the longitudinal direction of the back strip on the non-slot side outer circumference is the length per slot pitch in the core outer circumference of the laminated core. It is formed so that the mountain-shaped bending becomes smaller as it goes from the inner peripheral side of the back belt part to the outer peripheral side,
And also in the teeth portion, a teeth bent portion is formed in which the teeth portion and the back belt portion are continuously bent in a mountain shape along the core radial direction,
The teeth bent portion is bent at the same bending angle as the bending angle in the back belt bent portion, and the bent portions of the teeth portion and the back belt portion are formed in a straight line,
The teeth bent portion, the width of the teeth portion and the pitch between the teeth portion in the slot side inner peripheral portion of the back belt portion and the pitch between the slot portions become the predetermined dimension value of the laminated core,
As it goes to the outer peripheral side of the back belt part so that the length per one slot pitch in the longitudinal direction in the outer peripheral part on the opposite side of the back band part becomes the length per one slot pitch in the core outer peripheral part of the laminated core. A stator core for a rotating electric machine, characterized in that it is formed such that the angle of the mountain is reduced. In the stator core of the rotating electrical machine according to claim 1,
In each of the back belt portions and the teeth portions facing each other of the helical laminated core,
Each of the back band bent portion and each of the tooth bent portions are stacked in contact with each other. In the stator iron core of the rotating electrical machine according to claim 1 or 2,
Rotation characterized in that it is a peripheral part of the back band that is an outer peripheral area of an arbitrary radius or more of the back band part of the helical laminated core, and the peripheral part of the back band is flat without the bent parts. Electric stator core. In the stator core of the rotating electrical machine according to claim 3,
The back band peripheral part of the back band part of the helical laminated core forms a back band inclined part extending inclined in the radial direction with respect to a plane perpendicular to the axial direction of the helical laminated core. A stator core of a rotating electric machine characterized by In the stator core of the rotating electrical machine according to claim 4,
The stator core of a rotating electrical machine, wherein the back belt inclined portions of the helical laminated core facing each other are laminated in contact with each other. A belt-shaped core sheet formed by press-forming a tooth portion that forms a magnetic pole and a back belt portion that connects the teeth portions at an equal pitch is spirally wound and laminated into a cylindrical shape, and the inner periphery of the core sheet In the helical laminated core formed by forming a slot portion between the teeth portions on the side,
In the teeth portion arranged on the inner peripheral side of the core sheet, a teeth bent portion is formed in which the teeth portion and the back belt portion are bent in a mountain shape along the core radial direction,
The teeth bent portion is formed in a straight line in which the bent portions of the teeth portion and the back belt portion are continuous,
The teeth bent portion, the width of the teeth portion and the pitch between the teeth portion in the slot side inner peripheral portion of the back belt portion and the pitch between the slot portions become the predetermined dimension value of the laminated core,
As the length per slot pitch in the longitudinal direction of the outer periphery of the back strip on the side opposite to the slot becomes the length per slot pitch in the core outer periphery of the laminated core, the length toward the outer periphery of the back strip is increased. A stator core for a rotating electric machine, characterized in that it is formed such that the angle of the mountain is reduced.

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