JP2013093932A - Strip-shaped metal plate for spiral core formation, spiral core for rotary electric machine and manufacturing method of spiral core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form at low cost a spiral core for a rotary electric machine which can be machined into a spiral shape appropriately even when forming a coil through centralized winding around teeth of a stator core.SOLUTION: A strip-shaped steel plate 21 for forming a spiral core for a rotary electric machine includes a yoke 22 which extends in one direction and teeth 23 which are formed at equal intervals in one terminal portion of the yoke 22 in the width direction. Three notches 24 (e.g., 24a1-24a3) are formed at equal intervals at positions in the terminal portion, where the teeth 23 are formed, of the yoke 22 and at positions between the teeth 23 adjacent to each other. Then, oblique sides 26, 27 which are confronted to each other, of the notch 24 are overlapped to each other, thereby machining the strip-shaped steel plate 21 into a desired spiral shape.

Description

  The present invention relates to a strip-shaped metal plate for forming a spiral core, a spiral core of a rotating electrical machine, and a method for manufacturing the spiral core, and is particularly suitable for use as a core (iron core) included in the rotating electrical machine.

  A stator core of a rotating electrical machine such as a generator or an electric motor (referred to as “stator core” in the following description as needed) is formed by laminating metal plates such as electromagnetic steel plates and extends in the circumferential direction. And a plurality of teeth extending in the direction of the rotation axis from the inner peripheral surface of the yoke. In order to manufacture such a stator core, a core piece having the same shape as the yoke and teeth in the surface direction is punched out of a metal plate, and the core pieces are laminated in the thickness direction.

  Since the stator core manufactured in this way does not undergo elastic deformation in the surface direction during its manufacture, its magnetic properties are excellent. However, the outer peripheral shape of the yoke is circular, and the inner peripheral side of the yoke is open except for a portion that becomes a tooth. Therefore, when the stator core is manufactured in this way, many portions that are not used for the metal plate are generated. Therefore, the yield of the metal plate is reduced and the material cost is increased.

  In view of this, a spiral core is used as a stator core in an automobile generator or the like. The spiral core is formed by laminating a band-shaped metal plate formed in a shape corresponding to the yoke and the teeth while being spiraled by bending in the plate surface. However, when the strip metal plate is bent in the plate surface, the outer peripheral side of the portion that becomes the yoke of the strip metal plate extends from the inner peripheral side, and the thickness of the outer peripheral side of the strip metal plate is the thickness on the inner peripheral side. There is a risk of becoming thinner.

  For this reason, in patent document 1, it fills with the magnetic body powder in the clearance gap which arose on the outer peripheral side of the core when the outer peripheral side of the part used as the yoke of a strip | belt-shaped metal plate extends rather than an inner peripheral side. By doing so, the magnetic properties and rigidity of the core can be recovered.

  Moreover, in patent document 2, the strip | belt-shaped metal plate formed in the shape corresponding to a yoke and teeth is divided into several core pieces. The outer periphery of each core piece (the outer periphery of the portion that becomes the yoke) is fan-shaped according to the shape of the yoke. The core pieces adjacent to each other are connected to each other by a connecting portion formed on the outer peripheral side of the side end portion of the core piece, and the core pieces connected to each other by the connecting portion are arranged in the longitudinal direction. It is extended. When such a plurality of core pieces are spirally formed by bending in the plate surface, the regions on the inner peripheral side of the connecting portions of the side surfaces of the portions of the core pieces adjacent to each other are combined and the connecting portions are combined. Bend and deform. By doing in this way, it can prevent that the outer peripheral side of the part used as the yoke of a strip | belt-shaped metal plate becomes thinner than the inner peripheral side.

JP 2005-185014 A JP 2009-153266 A

However, since the technique described in Patent Document 1 requires a step of filling magnetic powder, it has been difficult to sufficiently reduce the cost of the spiral core.
Further, in the technique described in Patent Document 2, the outer periphery of each core piece is fan-shaped, and is unnecessary between the core pieces except for a portion serving as a connecting portion. Therefore, it cannot be said that the portion of the metal plate that is not used as a stator core is sufficiently reduced. That is, in the technique described in Patent Document 2, even if a spiral core is used as the stator core, it cannot be said that the yield of the metal plate is sufficiently reduced. Moreover, the strip | belt-shaped metal plate of patent document 2 has a complicated shape. From the above, even with the technique described in Patent Document 2, it has been difficult to sufficiently reduce the cost of the spiral core.

  In view of this, the present inventors have found that in PCT / JP2011 / 051732, a notch is provided at each of the positions corresponding to the inner peripheral end of the yoke of the stator and corresponding to the middle between adjacent teeth. A band-shaped metal plate for forming a spiral core formed one by one was proposed. When this metal strip for forming a spiral core is processed into a spiral shape, the notch is closed (the surfaces constituting the notch are joined together) to correct the difference between the outer circumference and the inner circumference of the spiral core. can do. As a result, the thickness of the outer peripheral side of the yoke of the spiral core is the thickness of the inner peripheral side without special processing after being processed into a spiral or complicating the shape of the strip-shaped steel plate processed into a spiral. Therefore, the cost of the spiral core can be reduced.

  By the way, the winding method of the stator coil includes concentrated winding and distributed winding. When a coil is formed on the teeth of the stator core by distributed winding, the number of teeth of the stator core is generally 24 or 48. Therefore, as in PCT / JP2011 / 051732, even if the number of notches formed between adjacent teeth is one, the notched portions are appropriately closed to form a spiral core forming strip metal plate in a spiral shape ( Circular).

  However, when a coil is formed by concentrated winding on the teeth of the stator core, the number of teeth is generally 6 if the number of poles is 4, and the number of teeth is 9 if the number of poles is 6. Therefore, when the number of notches formed between adjacent teeth is 1, as shown in FIG. 14, the angle θ of the notches 141a and 141b becomes too large (for example, the number of teeth is 6). If it is above, the angle θ of the notches 141a and 141b will be 60 [°] or more), and it is difficult to properly close the notches and process the strip-shaped metal plate for forming the spiral core into a desired spiral shape (circular shape). There is a risk of becoming.

  The present invention has been made in view of the above-described problems, and it is possible to reduce the cost of a helical core for a rotating electrical machine that can be appropriately processed in a helical manner even when a coil is formed by concentrated winding on teeth of a stator core. It aims at making it possible to form.

  The strip-shaped metal plate for forming a spiral core according to the present invention is a strip-shaped metal plate for forming a spiral core for forming a spiral core as a core included in a rotating electrical machine, and extends in the longitudinal direction, and one end in the width direction is linear. A plurality of teeth portions formed at substantially equal intervals on the other end in the width direction of the yoke portion, and the position of the other end in the width direction of the yoke portion, Cutout portions are formed at a plurality of positions in a region between two adjacent teeth portions, and when the yoke portions are curved in the width direction and processed into a spiral shape, It is characterized in that the areas facing each other are combined.

  The spiral core of the rotating electrical machine of the present invention is a spiral core of a rotating electrical machine formed by bending a belt-shaped metal plate in the plate surface direction into a spiral shape, and a yoke extending in the circumferential direction, A plurality of teeth extending in the axial direction from the inner circumferential end and positioned at substantially equal intervals in the inner circumferential direction of the yoke, and at the position of the inner circumferential end of the yoke In each of the plurality of positions in the region between the two teeth adjacent to each other, a cut is formed from the inner peripheral surface of the yoke to the outer peripheral surface, and the surfaces facing each other of the cut are It is characterized by being combined.

  The spiral core manufacturing method of the present invention is a spiral core manufacturing method for manufacturing the spiral core of the rotating electric machine by processing the spiral core forming strip metal plate into a spiral shape by curving it in the plate surface direction. And cutting the strip-shaped metal plate to form the spiral-core-forming strip-shaped metal plate, and processing the spiral-core-forming strip-shaped metal plate into a spiral by curving the strip-shaped metal plate in the plate surface direction. And a spiral machining step.

  According to the present invention, the spiral core forming strip-shaped metal plate has a yoke portion and a plurality of teeth portions, and is positioned at the other end in the width direction of the yoke portion and adjacent to each other. Cutout portions are formed at a plurality of positions in the region between the tooth portions. Therefore, even if the number of teeth of the stator core is small, a desired helical core can be formed. In addition, it is possible to obtain a helical core for a rotating electrical machine having good characteristics without performing special treatment after being processed into a spiral shape or complicating the shape of a strip-shaped steel plate processed into a spiral shape. Therefore, even when the coil is formed on the teeth of the stator core by concentrated winding, it is possible to form a helical core for a rotating electrical machine that can be appropriately processed in a spiral manner at a low cost.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the 1st Embodiment of this invention and shows the outline of an example of a structure of a rotary electric machine. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the 1st Embodiment of this invention and shows the outline of an example of the strip | belt-shaped steel plate before being processed into a spiral shape. It is a figure which shows the 1st Embodiment of this invention and shows the outline of an example of a structure of the manufacturing apparatus of the spiral core for rotary electric machines. It is a figure which shows the 1st Embodiment of this invention and shows the outline of an example of a mode that a yoke part and a teeth part are formed from a rectangular strip-shaped steel plate. It is a figure which shows the 2nd Embodiment of this invention and shows the outline of an example of a structure of a rotary electric machine. It is a figure which shows the 2nd Embodiment of this invention and shows the outline of an example of the strip | belt-shaped steel plate before being processed into a spiral shape. It is a figure which shows the 3rd Embodiment of this invention and shows the outline of an example of a structure of a rotary electric machine. It is a figure which shows the 3rd Embodiment of this invention and shows the outline of an example of the strip | belt-shaped steel plate before being processed into a spiral shape. It is a figure which shows the 3rd Embodiment of this invention and shows the modification of a notch part. It is a figure which shows the 4th Embodiment of this invention and shows the outline of an example of a structure of a rotary electric machine. It is a figure which shows the 4th Embodiment of this invention and shows the outline of an example of the strip | belt-shaped steel plate before being processed helically. It is a figure which shows the 5th Embodiment of this invention and shows the outline of an example of a structure of the manufacturing apparatus of the spiral core for rotary electric machines. It is a figure which shows the 6th Embodiment of this invention and shows the outline of an example of a structure of the manufacturing apparatus of the spiral core for rotary electric machines. It is a strip | belt-shaped steel plate before being processed into a spiral, Comprising: It is a figure which shows the outline of an example of the strip | belt-shaped steel plate in which the number of the notch parts formed between mutually adjacent teeth is one.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically illustrating an example of a configuration of a rotating electrical machine that is an application example of a spiral core for a rotating electrical machine. Specifically, FIG. 1 shows a cross-sectional view of a rotating electrical machine cut from a direction perpendicular to the rotation axis.
In FIG. 1, the rotating electrical machine 10 includes a stator (stator) 11, a rotor (rotor) 12, a case 13, and a rotating shaft 14. In FIG. 1, illustration of the coil and the like is omitted for convenience of illustration.

  The stator 11 has a stator core that includes a yoke extending in the circumferential direction of the rotating electrical machine and teeth extending in the direction of the rotating shaft 14 from an end portion (end surface) on the inner circumferential side of the yoke. Further, a coil (not shown) is inserted into a slot that is a region between adjacent teeth in the circumferential direction of the rotating electrical machine so as to be wound around the tooth. In this embodiment, the coil is formed by concentrated winding. The stator core is a spiral core. In FIG. 1, a case where the number of teeth is six is shown as an example, but the number of teeth is not limited to that shown in FIG. 1.

  As shown in FIG. 1, in the present embodiment, at a plurality of locations (three locations in FIG. 1) in the circumferential direction of each slot, cuts 15a to 15f (for example, cuts 15a1 to 15f1) directed from the inner peripheral surface of the stator 11 to the outer peripheral surface. 15a3) are formed at substantially equal intervals. The mutually opposing surfaces of the cuts 15a to 15f are combined, and there is almost no gap between the cuts 15a to 15f. In the present embodiment, the elastic deformation and plastic deformation are concentrated in the region on the outer peripheral side of the stator 11 with respect to the cuts 15a to 15f. Therefore, the stress generated in each of the cuts 15a to 15f is preferably as small as possible within a range smaller than the stress generated in the region on the outer peripheral side of the stator 11 than the cuts 15a to 15f, and most preferably 0. .

Further, the lengths (in the radial direction) of the cut lines 15a to 15f are made as long as possible within a range in which the shape of the stator 11 is not impaired when the stator 11 is formed as described later. preferable. By making the region on the outer peripheral side of the stator 11 as small as possible from the cuts 15a to 15f (that is, making the cuts 15a to 15f as long as possible), the strip steel plate is formed into a desired spiral shape as described later. This is because it becomes easy to process and form the stator core into a shape that meets the specifications.
Specifically, the length of the cuts 15a to 15f is at least ½ times the radial length of the yoke of the stator 11, preferably 3/4 times the radial length of the yoke of the stator 11. As described above, more preferably 4/5 times or more the radial length of the yoke of the stator 11. However, the length of the cuts 15a to 15f is less than the length of the yoke of the stator 11 in the radial direction.

  The outer peripheral surface of the rotor 12 is arranged at a position facing the tip end surface of the teeth of the stator 11 (that is, the inner peripheral surface of the stator 11) with a predetermined distance therebetween. Further, the axis of the rotor 12 (rotating shaft 14) is substantially coincident with the axis of the stator 11. In addition, since the stator 11 is a characteristic part in this embodiment, in FIG. 1, the structure of the rotor 12 is simplified and shown.

  The case 13 is brought into close contact with the stator 11 from the periphery (outer periphery) of the stator 11 by shrink fitting or the like, thereby fixing the stator 11. The case 13 is made of, for example, a magnetic material such as soft iron, or a nonmagnetic material such as stainless steel. In addition to shrink fitting, the stator 11 can be fixed to the case 13 by welding or bolting.

  FIG. 2 is a diagram showing an outline of an example of a strip steel plate before being processed into a spiral shape. Specifically, FIG. 2A is a view of the belt-shaped steel plate as viewed from a direction perpendicular to the plate surface. FIG. 2B is an enlarged view showing a region surrounded by a broken line in FIG. In addition, a steel plate is an example of a metal plate, and a specific example includes an electromagnetic steel plate, a cold-rolled steel plate, and a hot-rolled steel plate.

  As shown in FIG. 2A, the strip-shaped steel plate 21 extending along one direction has a yoke portion 22 corresponding to the yoke of the stator 11 and teeth portions 23 a to 23 c corresponding to the teeth of the stator 11. And notches 24a and 24b are formed. Although only three tooth portions 23 are shown in FIG. 2A, the number of teeth portions 23 that is an integral multiple of the number of teeth of the stator 11 is formed on the strip steel plate 21. In FIG. 2A, only six notches 24 are shown, but the number of notches 24 that is an integral multiple of the number of notches 15 a to 15 f is formed in the strip steel plate 21.

As shown in FIG. 2, the end of the outer side of the yoke portion 22 of the strip-shaped steel plate 21 (one end side in the width direction of the yoke portion 22 and the side where the teeth portions 23a to 23c are not formed) is linear. Yes. Moreover, the teeth parts 23a-23c are formed at equal intervals.
Position of the inner end of the yoke portion 22 (the other end side in the width direction of the yoke portion 22 and the side where the teeth portions 23a to 23c of the yoke portion 22 are formed) corresponding to each slot Three notches (notches) 24a1 to 24a3, 24b1 to 24b3 are formed at equal intervals in each of the teeth portions 23 (for example, positions between the tooth portions 23a and 23b) adjacent to each other. Thus, in this embodiment, three notches 24 are formed in all the regions corresponding to the slots.

  By making the outer end of the yoke portion 22 of the strip-shaped steel plate 21 linear, it is possible to prevent uneven pressure deformation and unexpected deviation when the strip-shaped steel plate 21 is processed into a spiral shape. Therefore, it is preferable that at least a part of the outer end portion of the yoke portion 22 of the strip-shaped steel plate 21 is linear. A mounting groove for the case 13 may be provided on the outer end of the yoke portion 22 of the belt-shaped steel plate 21.

  The shape of the notch 24 in the plate surface direction is an isosceles triangle or an equilateral triangle with the inner end of the yoke part 22 (the teeth part 23 side) as a base. The width W of the notch 24 at the inner end of the yoke 22 is a value corresponding to (proportional to) the difference between the outer circumference and the inner circumference of the stator 11. Further, the length (depth) D of the notch 24 is preferably as long as possible within the range in which the shape of the stator 11 is not impaired when the stator 11 is formed as described later. . As described above, this is because the region 25 (see FIG. 2B) where elastic deformation and plastic deformation are concentrated is made as small as possible by processing the strip steel plate 21 in a spiral shape. Specifically, the length D of the notch 24 corresponds to the length of the cut 15 and is at least the length in the width direction of the yoke 22 (the length between the inner end and the outer end of the yoke 22). ½), preferably 3/4 or more of the length of the yoke portion 22 in the width direction, more preferably 4/5 or more of the length of the yoke portion 22 in the width direction. However, the length D of the notch portion 24 is less than the length of the yoke portion 22 in the width direction.

  By configuring the strip-shaped steel plate 21 as described above, the difference between the outer peripheral length and the inner peripheral length of the stator 11 can be corrected by the notch 24, and the oblique sides 26 of the notch 24 facing each other. , 27 (see FIG. 2B) can be combined with each other to process the strip-shaped steel plate 21 into a desired spiral shape.

The shape of the plate surface of the strip-shaped steel plate 21 shown in FIG. 2A is obtained by slitter cutting with a roll blade, punching, or processing with a laser.
FIG. 3 is a diagram illustrating an outline of an example of a configuration of a manufacturing apparatus of a helical core (stator 11) for a rotating electrical machine. In addition, the white arrow shown in FIG. 3 shows the direction to which a strip | belt-shaped steel plate moves.
In FIG. 3, the manufacturing apparatus of a spiral core for a rotating electrical machine includes a shape processing device 31, a notch processing device 32, and a spiral processing device 33.

The shape processing device 31 performs a slitter cutting process or the like with a roll blade on the rectangular belt-shaped steel plate 34 to form the yoke portion 22 and the tooth portion 23 shown in FIG. At this stage, the notch 24 is not formed.
FIG. 4 is a diagram showing an outline of an example of a state in which the yoke portion 22 and the tooth portion 23 are formed from the rectangular belt-shaped steel plate 34.

  As shown to Fig.4 (a), the front end side of the teeth part of one strip steel plate 41 (42) is located in the area | region used as the slot of the other strip steel plate 42 (41) (namely, one strip steel plate 41). By machining the rectangular strip 34a so that the teeth 23 of (42) and the teeth 23 of the other strip 42 (41) are alternately positioned, unnecessary portions of the strip 34 can be formed. It can be reduced as much as possible, and a decrease in the yield of the strip-shaped steel plate 34a can be prevented as much as possible.

  However, the strip steel plate 43 may be formed as shown in FIG. 4B, not necessarily as shown in FIG. As described above, since the outer end portion of the yoke portion 22 is linear, as shown in FIG. 4B, the rectangular strip steel plate 34b is not required in the region outside the yoke portion 22. It is possible to reduce the number of such parts as compared with the technique described in Patent Document 2. In addition, in the case where a mounting groove for the case 13 is provided on the outer end portion of the yoke portion 22, after the state shown in FIGS. 4 (a) and 4 (b) is obtained, or FIG. 4 (a) and FIG. At the same time as the state shown in (b), processing for forming a mounting groove for the case 13 at the outer end of the yoke portion 22 may be performed.

  The notch processing device 32 performs punching or the like on the strip-shaped steel plate 35 on which the yoke portion 22 and the tooth portion 23 are formed, and sequentially forms the notch portions 24 shown in FIG. 2 by a predetermined number (1 or 2 or more). . This notch processing device 32 (position where the notch portion 24 is formed) is a position that does not interfere with the spiral processing device 33 and is located within a predetermined distance from the position where the strip steel plate 36 is processed in a spiral shape. If the distance between the formation of the notch 24 and the processing into a spiral is increased, the strip steel plate 36 may be bent before being processed into a spiral due to the presence of the notch 24. is there. In particular, the longer the length D of the notch 24 is, the higher the possibility that the strip-shaped steel plate 36 will bend is preferable. In this way, if the belt-shaped steel plate 36 is bent, when the belt-shaped steel plate 36 is deformed or processed into a spiral shape, the diagonal sides of the notch portions that are opposed to each other cannot be matched with each other, and the spiral core breaks. 15 may have a gap.

  In this case, the magnetic properties of the strip steel plate 36 itself are lowered, or the magnetic properties of the spiral core are lowered. Furthermore, since the strip steel plate 36 is processed into a spiral shape while being bent in the laminating direction, a gap is generated in the laminating direction of the strip steel plate 36, and the shape of the spiral core is deteriorated. In addition, when such a spiral core shape is forcibly corrected, a large processing strain is introduced into the spiral core, so that the magnetic properties of the spiral core are greatly deteriorated. Therefore, in order to suppress a decrease in magnetic characteristics due to bending, the winding position of the spiral machining (position where the bending process is started) and the side near the winding position of the notch processing device 32 that forms the notch 24. It is preferable that the distance (the predetermined distance) x to the end face is 1000 mm or less. In order to further improve the magnetic properties of the helical core, the distance x is more preferably 500 mm or less, and most preferably 300 mm or less. The distance x can be appropriately set according to the strength and thickness of the strip steel plate 36 and the length D of the notch 24. For example, the distance x may be set to 500 mm or less when the length D of the notch 24 is 3/4 or more of the length in the width direction of the yoke 22. Further, the distance x may be set to 10 mm or more so that the notch processing device 32 and the spiral processing device 33 (or the strip-shaped steel plate 36 spirally processed) do not interfere with each other.

The spiral processing device 33 bends the strip-shaped steel plate 36 in the plate width direction (direction perpendicular to the plate passing direction and the plate thickness direction) in order from the portion where the notch portion 24 is formed by the notch processing device 32. In this way, the layers are laminated while being bent and processed into a spiral shape. Specifically, the spiral processing device 33 is a belt-shaped non-uniform pressure roll so that the length in the longitudinal direction (circumferential direction) of the yoke portion 22 is longer than the length in the width direction (circumferential direction) of the teeth portion 23. The steel plate 36 can be processed into a spiral shape, or the strip-shaped steel plate 36 can be forced into a spiral shape along the guide. In this way, the yoke portion 22 is disposed on the outer peripheral side of the stator 11, and the tooth portion 23 is disposed on the inner peripheral side of the stator 11. The strip steel plate 36 processed and laminated by the spiral processing device 33 moves downward in the vertical direction while being wound around a core metal (not shown) of the spiral processing device 33. In this way, the strip steel plate 34 can be passed through without changing the height of the strip steel plate 34.
The strip-shaped steel plates 36 processed into a spiral shape are joined by caulking, bonding, welding, or the like, for example. The coupling of the strip-shaped steel plates 36 processed in a spiral manner as described above is completed, and a predetermined process is performed as necessary, whereby the stator 11 is formed.

  As described above, in the present embodiment, the strip-shaped steel plate 21 for forming the spiral core for a rotating electrical machine has the yoke portion 22 extending along one direction and one end portion in the width direction of the yoke portion 22 at equal intervals. Teeth portion 23 formed on the side of the yoke portion 22 on the side where the teeth portion 23 is formed, and between the adjacent tooth portions 23. Three notches 24 (for example, 24a1 to 24a3) are formed at intervals. Then, the oblique sides 26 and 27 facing each other of the notch 24 are aligned with each other so that the strip steel plate 21 is processed into a desired spiral shape. Therefore, even when the number of the teeth portions 23 is small as in the case where the coil is formed by concentrated winding, the belt-shaped steel plate 21 can be processed into a desired spiral shape. Moreover, it can prevent that the thickness of the outer peripheral side of the yoke of the manufactured stator 11 (spiral core for rotating electrical machines) becomes thinner than the thickness of the inner peripheral side. Furthermore, when the strip-shaped steel plate 21 is processed into a spiral shape, elastic deformation and plastic deformation can be concentrated on the outer peripheral side region 25 of the yoke portion 22 (yoke) with respect to the notch portion 24 (cut 15).

  Therefore, as in the prior art, a helical core for a rotating electrical machine having good characteristics can be obtained without special processing after being processed into a spiral shape or without complicating the shape of a strip-shaped steel plate processed into a spiral shape ( For example, a rotating electrical machine spiral core having excellent dimensional accuracy such as roundness and thickness and magnetic characteristics can be obtained, and the cost of the rotating electrical machine spiral core can be reduced. Moreover, since the strip-shaped steel plate 41 can be formed as shown in FIG. 4A, unnecessary portions of the rectangular strip-shaped steel plate 34a can be further reduced, and the cost of the spiral core for the rotating electrical machine can be reduced. Can be further reduced.

  In this embodiment, after forming the yoke portion 22 and the tooth portion 23 on the strip steel plate 34, the notch 24 is formed in the strip steel plate 35 at a position immediately before the strip steel plate 36 is processed into a spiral shape. The strip-shaped steel plate 36 is processed into a spiral shape in order from the portion where the portion 24 is formed. For example, if the notch 24 is formed together with the yoke portion 22 and the tooth portion 23 on the strip steel plate, the rigidity of the strip steel plate is reduced. For this reason, the strip steel plate is deformed by the time the strip steel plate reaches the spiral machining apparatus 33, and the magnetic properties and shape of the spiral core are deteriorated. Further, since the notch 24 is simultaneously formed together with the yoke 22 and the teeth 23, it is difficult to reuse the processing unit (for example, a mold or CAD data) by changing the dimension such as the length D of the notch 24. This may increase the cost. Moreover, even if the position where the yoke part 22, the tooth part 23, and the notch part 24 are formed at a time is immediately before the position where the strip steel plate is processed into a spiral shape, one sheet as shown in FIG. It becomes difficult to manufacture a plurality of strip steel plates 41 and 42 from the rectangular strip steel plate 34a. For this reason, the production elasticity of a spiral core falls.

  As described above, after forming the yoke portion 22 and the tooth portion 23, it is preferable to form the notch portion 24 at a position immediately before being processed into a spiral shape, but this is not necessarily required. For example, you may form the notch part 24 with the yoke part 22 and the teeth part 23 at once. Moreover, the position where the yoke part 22, the tooth part 23, and the notch part 24 are formed at a time can be set to a position immediately before the strip steel plate is processed into a spiral shape.

Further, notch portions 24 (for example, notch portions 24a1 to 24a1) formed at the positions of the end portions of the yoke portion 22 on the side where the teeth portions 23 are formed and between the tooth portions 23 adjacent to each other. The number of 24a3) is not limited to 3, and can be determined as appropriate according to the size of the stator 11 (the number of teeth 23) and the like as long as it is 2 or more. Further, the number of the notches 24 formed at the positions of the end portions of the yoke portion 22 on the side where the tooth portions 23 are formed and between the adjacent tooth portions 23 is not the same. May be.
Further, a plurality of notches 24 (for example, notches) formed at the positions of the end portions of the yoke portion 22 on the side where the teeth portions 23 are formed and between the adjacent tooth portions 23. The intervals at which 24a1 to 24a3) are arranged may not be equal.

Moreover, if the oblique sides 26 and 27 facing each other of the notch 24 can be aligned with each other and the strip-shaped steel plate 21 can be processed into a desired spiral shape, the size and shape of each notch 24 are not the same. Also good. In this case, for example, in FIG. 3, as the notch processing device 32 for forming different notch portions 24, the same number of notch processing devices 32 as the number of different notch portions 24 are used, and the shape processing device 31 and the spiral processing device. It may be arranged in series with 33. In this case, between the end surface near the winding position of the notch processing device 32 arranged at the position closest to the spiral processing device 33 and the spiral processing winding position (position at which bending processing is started). The distance is the distance x.
Further, the helical core for rotating electrical machines described in the present embodiment can be used not as a stator of the rotating electrical machine but as a rotor.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The present embodiment is different from the first embodiment described above only in the shape of the notch, and the other portions are the same. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals as those in FIGS.

FIG. 5 is a diagram illustrating an outline of an example of a configuration of a rotating electrical machine that is an application example of the spiral core for the rotating electrical machine. FIG. 5 is a diagram corresponding to FIG.
In FIG. 5, the rotating electrical machine 50 includes a stator 51, a rotor 12, a case 13, and a rotating shaft 14.
As shown in FIG. 5, in this embodiment, cuts 52 a to 52 f (for example, cuts 52 a 1 to 52 a 3) from the inner peripheral surface of the stator 51 to the outer peripheral surface are provided at substantially equal intervals at a plurality of locations in the circumferential direction of each slot. It is formed, and cylindrical or elliptical columnar holes 53a to 53f are individually formed at the tips of the cut lines 52a to 52f (on the side close to the outer peripheral end of the stator 51). Similarly to the first embodiment, the mutually opposing surfaces of the cut lines 52a to 52f are combined with each other, and the stress generated on the surfaces (the cut lines 52a to 52f) is greater than that of the cut lines 52a to 52f. Is preferably as small as possible within the range smaller than the elastic deformation and plastic deformation occurring in the outer peripheral side region, and is most preferably 0. The total length (in the radial direction) of the cut line 52 and the hole 53 is preferably made as long as possible when the stator 51 is formed so that the shape of the stator 51 is not impaired. .

  Specifically, the total value (in the radial direction) of the cut line 52 and the hole 53 is at least 1/2 times the radial length of the yoke of the stator 51, preferably the yoke diameter of the stator 51. 3/4 times or more of the length in the direction, more preferably 4/5 times or more the radial length of the yoke of the stator 51. However, the total value (in the radial direction) of the cut line 52 and the hole 53 is less than the radial length of the yoke of the stator 71.

FIG. 6 is a diagram illustrating an outline of an example of a strip steel plate before being processed into a spiral shape. FIG. 6 is a diagram corresponding to FIG.
As shown to Fig.6 (a), the yoke part 63, the teeth parts 23a-23e, and the notches 62a and 62b are formed in the strip | belt-shaped steel plate 61 extended along one direction. Although only three tooth portions 23 are shown in FIG. 6A, the number of teeth portions 23 that is an integral multiple of the number of teeth of the stator 51 is formed on the strip steel plate 61. In FIG. 2A, only six notches 62 are shown, but the number of notches 62 that is an integral multiple of the number of the notches 52 a to 52 f is formed in the strip steel plate 61.
As in the first embodiment, the position of the end portion on the inner side of the yoke portion 63 (the side on which the tooth portion 23 of the yoke portion 63 is formed) corresponding to each slot (the teeth adjacent to each other). Three notches (notches) 62a1 to 62a3 and 62b1 to 62b3 are formed at equal intervals in each of the portions 23 (for example, positions between the tooth portions 23a and 23b). As described above, also in this embodiment, three notches 62 are formed in all the regions corresponding to the slots, as in the first embodiment.

The shape of the notch 62 in the plate surface direction is a shape in which the region of the apex angle of an isosceles triangle or equilateral triangle with the end (the teeth 23 side) inside the yoke 63 being a base is circular or elliptical. is there. As in the first embodiment, the width W of the notch 62 at the inner end of the yoke portion 63 is a value corresponding to (proportional to) the difference between the outer peripheral length and the inner peripheral length of the stator 51. Become. Further, it is preferable that the length (depth) D of the notch 62 is made as long as possible within the range in which the shape of the stator 51 is not impaired when the stator 51 is formed.
The method of manufacturing the stator 51 is different from the method of manufacturing the stator 11 described in the first embodiment in that the notch processing device 32 forms the notch 62 instead of the notch 24. The other points are the same. Specifically, the length D of the notch 62 can be defined as in the first embodiment.
Even if the notch 62 is formed as described above, the effects described in the first embodiment can be obtained.
Also in the present embodiment, various modifications described in the first embodiment can be employed.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first and second embodiments, since the shape of the notches 24 and 62 is a triangle, the notch portions are formed when processing into a spiral shape or when welding the outer periphery of a spiral core processed into a spiral shape. The surface where 24 and 62 are combined is likely to be displaced in the radial direction, and the roundness of the inner diameter of the spiral core may be lowered. Therefore, in this embodiment, in order to suppress an increase in the difference in thickness between the outer peripheral side and the inner peripheral side of the spiral core and a decrease in the roundness of the inner diameter of the spiral core with a simple configuration as much as possible. In addition, a recess is formed on one surface of the cut-out portions that are combined with each other, and a protrusion corresponding to the recess is formed on the other surface. As described above, the present embodiment is different from the first and second embodiments only in the shape of the notch, and the other portions are the same. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals as those in FIGS.

FIG. 7 is a diagram illustrating an outline of an example of a configuration of a rotating electrical machine that is an application example of the spiral core for the rotating electrical machine. FIG. 7 is a diagram corresponding to FIGS. 1 and 5.
In FIG. 7, the rotating electrical machine 70 includes a stator 71, a rotor 12, a case 13, and a rotating shaft 14.

As shown in FIG. 7, in the present embodiment, cuts 72a to 72f (for example, cuts 72a1 to 72f1) extending from the inner peripheral surface of the stator 11 to the outer peripheral surface at a plurality of locations (three locations in FIG. 7) in the circumferential direction of each slot. 72a3) is formed. As in the first and second embodiments, the mutually opposing surfaces of the cuts 72a to 72f are combined, and there is (almost) no gap between the cuts 72a to 72f.
In the present embodiment, the shape in the plane direction perpendicular to the axis (rotation shaft 14) of the cuts 72a to 72f is such that the distal ends of the cuts 72a to 72f (the side closer to the outer peripheral end of the yoke) and the base ends (the yokes). It is a shape having a portion protruding in the circumferential direction with respect to a straight line connecting the end portions on the inner peripheral side) (see the wedge-shaped portion in FIG. 7) and a portion along the straight line.
Here, the “length in the surface direction perpendicular to the axis (rotating shaft 14)” of the cuts 72a to 72f is referred to as “overhanging contour length”. Further, when the shape in the plane direction perpendicular to the axis (rotating shaft 14) is assumed to be a straight line (straight line along the radial direction) connecting the distal ends and the base ends of the cuts 72a to 72f, The “length in the plane direction perpendicular to the axis (rotating shaft 14)” is referred to as the “non-projecting length”. Although details will be described later, in the present embodiment, in order to suppress the deterioration of the magnetic characteristics and facilitate the processing, the overhanging contour length is set to be not more than twice the overhanging contour length ( (See the description of Contoured Contour Length and Contourless Contour Length).
In the present embodiment, since elastic deformation and plastic deformation are concentrated on the outer peripheral side region of the stator 71 relative to the cut lines 72a to 72f, the stress generated in each cut line 72a to 72f is from the cut lines 72a to 72f. Is preferably as small as possible within the range smaller than the stress generated in the outer peripheral region of the stator 71, and most preferably 0.

In addition, the depth of the cut 72 (the length of a straight line connecting the distal ends and the base ends of the cuts 72a to 72l) is the shape of the stator 11 when the stator 11 is formed as described later. It is preferable to make the length as long as possible within a range that is not impaired. Similar to the first and second embodiments, by making the outer peripheral side region of the stator 71 smaller than the cuts 72a to 72l as much as possible (that is, making the cuts 72a to 72l as long as possible) This is because, as will be described later, it becomes easy to form the stator core into a shape that meets the specifications by processing the strip-shaped steel plate into a desired spiral shape.
Specifically, the depth of the cuts 72a to 72l is at least 1/2 times the radial length of the yoke of the stator 71, preferably 3/4 times the radial length of the yoke of the stator 71. As described above, more preferably, the length of the stator 71 in the radial direction of the yoke is 4/5 times or more. However, the depth of the cuts 72a to 72l is less than the length of the stator 71 in the radial direction of the yoke.

  FIG. 8 is a diagram showing an outline of an example of a strip steel plate before being processed into a spiral shape. FIG. 8 is a diagram corresponding to FIGS. 2 and 6.

  As shown to Fig.8 (a), the yoke part 85, the teeth parts 23a-23e, and the notches 82a and 82b are formed in the strip | belt-shaped steel plate 81 extended along one direction. Although only three teeth portions 23 are shown in FIG. 8A, the number of teeth portions 23 that is an integral multiple of the number of teeth of the stator 71 is formed on the belt-shaped steel plate 81. 8A shows only six cutouts 82, the number of cutouts 82 is an integral multiple of the number of cuts 72a to 72f.

  As in the first and second embodiments, the position of the end portion on the inner side of the yoke portion 85 (the side on which the teeth portion 23 of the yoke portion 85 is formed) corresponding to each slot (mutually Three notches (notches) 82a1 to 82a3, 82b1 to 82b3 are formed at equal intervals in each of the adjacent tooth portions 23 (for example, positions between the tooth portions 23a and 23b). As described above, also in this embodiment, three notches 82 are formed in all the regions corresponding to the slots, as in the first and second embodiments.

  In FIG. 8B, the notch portion 82 is a first contour portion having both ends of a distal end portion 83a located at the deepest portion and one base end portion 83b located at an inner end portion of the yoke portion 85. 83d, the front-end | tip part 83a, and the 2nd outline part 83e which uses the other base end part 83c located in the edge part inside the yoke part 22 as both ends.

  A concave portion 83f is formed in the first contour portion 83d, and a convex portion 83g corresponding to the concave portion 83f is formed in the second contour portion 83e. In the present embodiment, the shape in the plate surface direction of the notch 82 when it is assumed that the concave portion 83f and the convex portion 83g are not formed has the distal end portion 83a as the apex and the base end portions 83b and 83c are mutually connected. It is an isosceles triangle or equilateral triangle with a straight line connected to the base (in FIG. 8, an isosceles triangle is shown as an example). Further, the shape and size of the concave portion 83f and the shape and size of the convex portion 83g are substantially the same. In addition, when the strip-shaped steel plate 81 is processed into a spiral shape, a concave portion 83f and a convex portion 83b are formed at a position where the concave portion 83f and the convex portion 83b are combined with each other.

  Here, the length of the contour of the notch 82 when it is assumed that the concave portion 83f and the convex portion 83b are not formed (in the example shown in FIG. 8, the distal end portion 83a and the base end portions 83b and 83c are connected to each other. The sum of the straight lines) is referred to as “uneven contour length”. The length of the contour of the notch 82 (in the example shown in FIG. 8, the total length of the sides constituting the first contour portion 83d and the second contour portion 83e) is referred to as “concave-convex length”. .

  In this embodiment, the contoured contour length is set to be not more than twice the contour-free contour length. This is because when the uneven contoured length exceeds twice the uneven contourless length, distortion introduced into the strip-shaped steel plate 81 when the strip-shaped steel plate 81 is cut to form the notch 82 is increased. Further, in order to make the uneven contour length exceed twice the uneven contour length, it is necessary to increase the number of the concave portions 83f and the convex portions 83b or increase the size of the concave portions 83f and the convex portions 83b. There is. For this reason, even if the positional deviation with respect to the design value of the concave portion 83f and the convex portion 83g is not large, it is impossible or difficult to align the concave portion 83f and the convex portion 83g with each other when the strip steel plate 81 is processed into a spiral shape. There is a risk of becoming.

  As in the first and second embodiments, the width (the length of a straight line connecting the base end portions 83b and 83c) W at the inner end portion of the yoke portion 85 is the outer circumference of the stator 71. It becomes a value corresponding to (proportional to) the difference between the length of and the inner circumference. In addition, the length (depth) D of the notch 82 is preferably as long as possible within the range in which the shape of the stator 71 is not impaired when the stator 71 is formed. Specifically, the length D of the notch 82 corresponds to the radial length of the cut 72, and the length of the yoke 22 in the width direction (between the inner end and the outer end of the yoke 85). ½ times), preferably 3/4 times or more, more preferably 4/5 times or more. However, the length D of the notch portion 24 is less than the length of the yoke portion 85 in the width direction.

By configuring the strip-shaped steel plate 81 as described above, the difference between the outer peripheral length and the inner peripheral length of the stator 71 can be corrected by the notch portion 82.
The method of manufacturing the stator 71 is different from the method of manufacturing the stator 11 described in the first embodiment in that the notch processing device 32 forms the notch portion 82 instead of the notch portion 24. The other points are the same.

  As described above, in the present embodiment, the strip-shaped steel plate 81 is spirally processed in the first contour portion 83d and the second contour portion 83e of the notch portion 82, and the first contour portion 83d and the second contour portion are processed. A concave portion 83f and a convex portion 83g are formed which are combined with each other when 83e is combined with each other. Therefore, when the strip-shaped steel plate 81 is processed into a spiral shape or when a spiral core processed into a spiral shape is joined (for example, when the outer periphery of the spiral core is welded), 72) can be prevented from being displaced in the radial direction of the rotating electrical machine 70 as compared to the case where the concave portion 83f and the convex portion 83g are not formed. Therefore, in addition to the effects described in the first embodiment, it is possible to suppress a decrease in the roundness of the inner diameter of the core (spiral core) of the stator 71 with a simple configuration (after processing into a spiral shape, a special Without the need for processing or complicating the shape of the strip-shaped steel plate to be processed into a spiral shape.

[Modification]
FIG. 9 is a diagram illustrating a modification of the notch.
A notch 91 shown in FIG. 9A is different from the notch 82 shown in FIG. As in the example shown in FIG. 9A, the concave portion 91a and the convex portion 91b may have a curvature. Even in this case, when the strip-shaped steel plate is processed into a spiral shape, the concave portion 91a and the convex portion 91b are adapted to each other. That is, the shape of the concave portion and the convex portion is not limited as long as the concave portion and the convex portion are adapted to each other when the strip steel plate is processed into a spiral shape.

  The notch 92 shown in FIG. 9B is different from the notch 82 shown in FIG. 8 in the number of recesses and protrusions. As in the example shown in FIG. 9B, the number of the concave portions 92a and 92b and the convex portions 92c and 92d may be plural. In this way, it is possible to more reliably prevent the surfaces of the cutout portions 92 that are aligned with each other from being displaced in the radial direction. Even in this case, when the strip-shaped steel plate is processed into a spiral shape, the corresponding concave portion and convex portion (in the example shown in FIG. 9B, the concave portion 92a, the convex portion 92c, and the concave portion 92b). And the convex portion 92d) are adapted to each other. That is, the number of concave portions and convex portions is not limited as long as the corresponding concave portions and convex portions are adapted to each other when the strip-shaped steel plate is processed into a spiral shape. In the case shown in FIG. 9B, each of the cuts formed in the spiral core is formed with a plurality of portions projecting in the circumferential direction with respect to a straight line connecting the leading end and the base end of the cut. It will be.

The cutout portion 93 shown in FIG. 9C is different from the cutout portion 82 shown in FIG. As in the example shown in FIG. 9C, a concave portion 93f is formed in the entire first contour portion 93d having the distal end portion 93a and the proximal end portion 93b at both ends, and the distal end portion 93a and the proximal end portion 93c are formed. The convex portion 93g may be formed on the entire second contour portion 93e as both ends. Even in this case, when the strip-shaped steel plate is processed into a spiral shape, the concave portion 93f and the convex portion 93g are adapted to each other. That is, the range in which the concave and convex portions are formed is not limited as long as the concave and convex portions are aligned with each other when the strip steel plate is processed into a spiral shape. In the case shown in FIG. 9C, the shape of the cut formed in the spiral core in the plane direction perpendicular to the axial center projects in the circumferential direction with respect to the straight line connecting the tip and the base of the cut. The shape has only the part.
In the example shown in FIG. 9 as well, as described above, it is preferable that the uneven contour length is not more than twice the uneven contour-free length. Further, the length D of the notch 24 is preferably ½ times or more of the length in the width direction of the yoke portion 85, preferably 3/4 or more, and more preferably 4/5 or more.
In addition, also in the present embodiment, various modifications described in the first embodiment can be employed.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. This embodiment is different from the first to third embodiments described above only in the shape of the tip of the notch, and the other parts are the same. Therefore, in the description of the present embodiment, the same parts as those in the first to third embodiments described above are denoted by the same reference numerals as those in FIGS. .

FIG. 10 is a diagram showing an outline of an example of the configuration of the rotating electrical machine. FIG. 10 is a diagram corresponding to FIGS. 1, 5, and 7.
In FIG. 10, the rotating electrical machine 100 includes a stator 101, a rotor 12, a case 13, and a rotating shaft 14.
As shown in FIG. 10, in this embodiment, cuts 102 a to 102 f (for example, cuts 102 a 1 to 102 a 3) from the inner peripheral surface of the stator 101 to the outer peripheral surface are provided at substantially equal intervals at a plurality of locations in the circumferential direction of each slot. In addition, cylindrical or elliptical column-shaped holes 103a to 103f are individually formed at the ends of the cut lines 102a to 102f (the side close to the outer peripheral end of the stator 101). Similarly to the first to third embodiments, the mutually opposing surfaces of the cuts 102a to 102f are combined with each other, and the stress generated on the surfaces (the cuts 102a to 102f) is more than the cuts 102a to 102f. It is preferably as small as possible within a range smaller than the stress generated in the outer peripheral side region of the stator 101, and is most preferably zero. Further, it is preferable that the total length (in the radial direction) of the cut line 102 and the hole 103 is made as long as possible as long as the shape of the stator 101 is not impaired when the stator 101 is formed. .

  Specifically, the total value of the lengths (in the radial direction) of the cut line 102 and the hole 103 is at least 1/2 times the radial length of the yoke of the stator 101, preferably the diameter of the yoke of the stator 101. The length in the direction is not less than 3/4 times, more preferably not less than 4/5 times the length of the stator 101 in the radial direction of the yoke. However, the total value (in the radial direction) of the cut line 102 and the hole 103 is less than the radial length of the yoke of the stator 101.

FIG. 11 is a diagram showing an outline of an example of a strip steel plate before being processed into a spiral shape. FIG. 11 is a diagram corresponding to FIGS. 2, 6, and 8.
As shown to Fig.11 (a), the yoke part 114, the teeth parts 23a-23e, and the notch parts 112a and 112b are formed in the strip | belt-shaped steel plate 111 extended along one direction. In FIG. 11A, only three tooth portions 23 are shown, but the number of teeth portions 23 that is an integral multiple of the number of teeth of the stator 101 is formed on the belt-shaped steel plate 111. Further, in FIG. 11A, only six notches 112 are shown, but the number of notches 112 that is an integral multiple of the number of notches 102a to 102f is formed in the strip steel plate 111.

  As in the first to third embodiments, the position of the end portion on the inner side of the yoke portion 114 (the side on which the tooth portion 23 of the yoke portion 114 is formed) corresponding to each slot (mutually Three notches (notches) 112a1 to 112a3 and 112b1 to 112b3 are formed at equal intervals in each of adjacent tooth portions 23 (for example, positions between the tooth portions 23a and 23b). As described above, also in this embodiment, three notches 112 are formed in all the regions corresponding to the slots, as in the first to third embodiments.

  In FIG. 11B, the notch 112 has a first contour portion 113d having both ends of a distal end portion 113a positioned at the deepest portion and one base end portion 113b positioned at an inner end portion of the yoke portion 114. And a second contour portion 113e having both ends of the distal end portion 113a and the other proximal end portion 113c located at the inner end portion of the yoke portion 114.

  A concave portion 113f is formed in the first contour portion 113d, and a convex portion 113g is formed in the second contour portion 113e. In the present embodiment, the shape in the plate surface direction of the notch 112 when it is assumed that the recess 113f and the protrusion 113g are not formed is a straight line connecting the base ends 113b and 113c with the base. The shape of the apex angle of the isosceles triangle or equilateral triangle is an arc shape or an elliptical arc shape (in FIG. 11, the case where the apex angle region of the isosceles triangle is an arc shape is taken as an example) Shown). Further, the shape and size of the recess 113f and the shape and size of the projection 113g are substantially the same. Furthermore, when the strip-shaped steel plate 111 is processed into a spiral shape, the concave portion 113f and the convex portion 113b are formed at positions where the concave portion 113f and the convex portion 113b are combined with each other.

  In the example shown in FIG. 11, the above-mentioned “uneven contour length without concavo-convex” refers to the length of the contour of the arc-shaped region of the distal end portion 73a and the lower end 113h and the base end 113b of the arc-shaped region. This is the sum of the length of the connected straight line and the length of the straight line connecting the other lower end 113i and the base end 113b of the arcuate region. On the other hand, the “concave / convex contour length” is the length of the contour of the cutout portion 112 (the total length of the sides constituting the first contour portion 113d and the second contour portion 113e). Also in this embodiment, as with the third embodiment, the contoured contour length is set to be twice or less the contour-free contour length. However, the length of the contour of the arc-shaped region may not be included in the “concave / convex no contour length” and the “concave / concave contour length”.

The width W of the notch 112 at the inner end of the yoke 114 (the length of the straight line connecting the base ends 113b and 113c) W is the difference between the outer circumference and the inner circumference of the stator 101. (Proportional) according to Further, it is preferable that the length (depth) D of the notch 112 is made as long as possible within the range in which the shape of the stator 101 is not impaired when the stator 101 is formed. Specifically, as in the third embodiment, the length D of the notch 112 can be defined.
Even when the notch 112 is formed as described above, the effects described in the third embodiment can be obtained.
The method of manufacturing the stator 101 is different from the method of manufacturing the stator 11 described in the first embodiment in that the notch processing device 32 forms the notch portion 112 instead of the notch portion 24. The other points are the same.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. In this embodiment, as shown in FIG. 4A, when a plurality of strip steel plates 41 and 42 are formed from a single rectangular strip steel plate 34a by the shape processing apparatus 31, a spiral core is manufactured more efficiently. Therefore, the same number of notch processing devices 32 and spiral processing devices 33 as the number of strip-shaped steel plates formed by the shape processing device 31 are provided. As described above, the present embodiment is different from the first to fourth embodiments in a part of the configuration of the manufacturing apparatus of the helical core for a rotating electrical machine. Therefore, in the description of the present embodiment, the same parts as those in the first to fourth embodiments are denoted by the same reference numerals as those in FIGS.

  FIG. 12 is a diagram illustrating an outline of an example of a configuration of a manufacturing apparatus of a helical core (stator 11) for a rotating electrical machine. Specifically, FIG. 12A is a diagram illustrating a first example of the arrangement of the manufacturing apparatus for the rotating electrical machine spiral core, and is a view of the manufacturing apparatus for the rotating electrical machine spiral core as viewed from above in the vertical direction. It is. FIG. 12A corresponds to FIG. FIGS. 12B and 12C are views showing second and third examples of the arrangement of the notch processing device 32 and the spiral processing device 33 in the helical core manufacturing device for a rotating electrical machine, respectively. It is the figure which looked at the manufacturing apparatus of the spiral core for electric machines from the side direction (horizontal direction). In addition, in FIG.12 (b) and FIG.12 (c), each structure of the manufacturing apparatus of the helical core for rotary electric machines is shown with the block for convenience of description.

As shown in FIG. 12, the manufacturing apparatus of the spiral core for a rotating electrical machine according to this embodiment includes a shape processing device 31, a plurality of notch processing devices 32 (32a, 32b), and a plurality of spiral processing devices 33 (33a, 33b). And).
In the example shown in FIG. 12A, two spiral processing devices 33a and 33b are arranged side by side in the horizontal direction (x direction), and each notch processing device 32a (32b) is disposed immediately before each spiral processing device 33a (33b). Is arranged. Moreover, each strip | belt-shaped steel plates 41 and 42 formed with the shape processing apparatus 31 are isolate | separated, and are conveyed in a respectively different direction. The strip steel plates 41 (42) are respectively processed by a notch processing device 32a (32b) and a spiral processing device 33a (33b).

As in the example shown in FIG. 12B, two spiral processing devices 33a and 33b are arranged in the vertical direction (z direction) of the manufacturing apparatus of the spiral core for a rotating electrical machine, and each spiral processing device 33a (33b). The notch processing device 32a (32b) may be arranged immediately before the. In this case, for example, since the center of the spiral core can be aligned, the same power can be used for the spiral processing devices 33a and 33b.
Further, as shown in FIG. 12C, any one of the two notch processing devices 32a and 32b and the spiral processing devices 33a and 33b shown in FIG. The notch processing devices 32a and 32b and the spiral processing devices 33a and 33b may be arranged shifted in the y direction).
However, the condition that the strip steel plate 41 (42) does not deform until the strip steel plate 41 (42) reaches the spiral machining device 33a (33b) (for example, from the notch machining device 32a (32b) to the spiral machining device 33a (33b)). If the distance satisfies the distance x) described in the first embodiment, the arrangement method of the two spiral processing devices 33a (33b) is not particularly limited to that shown in FIG.

  In addition, in the example of arrangement | positioning of the manufacturing apparatus of the helical core for rotary electric machines shown in FIG. 12, each strip | belt-shaped steel plates 41 and 42 are isolate | separated and each are conveyed in a different direction. For this reason, if the conveyance distance of the strip | belt-shaped steel plates 41 and 42 from the shape processing apparatus 31 to the spiral processing apparatus 33 is shortened, each strip | belt-shaped steel plate 41 and 42 will deform | transform and the magnetic characteristic and shape of a spiral core may deteriorate. is there. Therefore, the transport distance of the strip steel plates 41 and 42 from the shape processing device 31 to the spiral processing device 33 is not less than a predetermined value so that the angle formed by the transport directions when the strip steel plates 41 and 42 are separated can be sufficiently reduced. It is preferable that

  As described in the first embodiment, when the yoke portion 22, the tooth portion 23, and the notch portion 24 are formed at a time on the strip steel plate, the rigidity of the strip steel plate is reduced. For this reason, the strip steel plate is deformed by the time the strip steel plate reaches the spiral machining apparatus, and the magnetic properties and shape of the spiral core are deteriorated. In this case, when the plurality of strip steel plates 41 and 42 are formed from one rectangular strip steel plate 34a, the transport distance of the strip steel plates from the shape processing device 31 to the spiral processing device 33 becomes long. Therefore, as shown in FIG. 12, in the present embodiment, a plurality of notch processing devices 32 (32a, 32b) are required in addition to the shape processing device 31, as in the first embodiment. And each notch processing apparatus 32 is arrange | positioned in the position within the distance x demonstrated in 1st Embodiment from each spiral processing apparatus 33 (33a, 33b). In addition, by switching the belt-shaped steel plate conveyance line, it is possible to form one belt-shaped steel plate from one rectangular belt-shaped steel plate 34a, and the production amount can be adjusted flexibly.

Further, by adding a spiral processing device 33 and a notch processing device 32 corresponding to the spiral processing device 33, a plurality of strip-shaped steel plates having different shapes can be formed from one rectangular strip-shaped steel plate 34a. Is possible. In this case, for example, different types of spiral processing devices 33 can be added to manufacture spiral cores having different diameters.
Thus, the manufacturing method and manufacturing apparatus of the spiral core for rotating electrical machines of this embodiment can respond to spiral cores (banded steel plates) of various shapes.
The manufacturing apparatus of the helical core for a rotating electrical machine according to this embodiment is the same when manufacturing not only the stator 11 of the first embodiment but also the stators 51, 71, 101 of the second to fourth embodiments. Can be applied to.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. In this embodiment, with respect to the apparatus for manufacturing a helical core for a rotating electrical machine according to the first embodiment, a structure that more reliably prevents the deformation of the strip steel plate, and the strip steel plate is a hard steel plate such as an electromagnetic steel plate (for example, 3 % Si-based electromagnetic steel sheet) is added with a configuration for more efficiently and reliably processing the spiral core and a configuration for more reliably removing the distortion of the spiral core. As described above, the present embodiment is different from the first to fifth embodiments in a part of the configuration of the manufacturing apparatus of the helical core for a rotating electrical machine. Therefore, in the description of this embodiment, the same parts as those in the first to fifth embodiments are denoted by the same reference numerals as those in FIGS.

FIG. 13 is a diagram illustrating an outline of an example of a configuration of a manufacturing apparatus of a helical core for a rotating electrical machine (stator 11). FIG. 13 corresponds to FIG.
In FIG. 13, the manufacturing apparatus of the spiral core for a rotating electrical machine includes a shape processing device 31, a notch processing device 32, a spiral processing device 33, a heating device 37, guides 38a and 38b, a strain relief heating device 39, Have

  The heating device 37 is disposed between the notch processing device 32 and the spiral processing device 33, and heats the strip steel plate 36 in which the notch portion 24 is formed by the notch processing device 32. When the strip steel plate 36 is a hard steel plate such as an electromagnetic steel plate, the workability of the strip steel plate 36 is temporarily improved by heating the strip steel plate 36 at a position immediately before the strip steel plate 36 is processed into a spiral shape. Thus, the belt-shaped steel plate 36 can be processed into a desired spiral shape efficiently and reliably. The heating temperature by the heating device 37 can be determined according to the steel plate. For example, when the strip-shaped steel plate 36 is a 3% Si-based electromagnetic steel plate, the heating temperature is about 300 ° C. The heating device 37 is necessary when a hard steel plate such as an electromagnetic steel plate is processed into a spiral shape. When such a steel plate is not used, the heating device 37 is not necessarily used. .

The guide 38a is disposed between the shape processing device 31 and the notch processing device 32, and at least the strip-shaped steel plate 35 in which the yoke portion 22 and the tooth portion 23 are formed by the shape processing device 31 is at least a spiral core for a rotating electrical machine. Is supported from the lower side in the vertical direction of the manufacturing apparatus (the plate surface of the belt-shaped steel plate 35 is backed). Thereby, a deformation | transformation of the strip | belt-shaped steel plate 35 can be suppressed.
The guide 38b is disposed between the notch processing device 32 and the spiral processing device 33, and at least the strip-shaped steel plate 36 in which the notch portion 24 is formed by the notch processing device 32 is used at least in the vertical direction of the manufacturing apparatus of the spiral core for a rotating electrical machine. It supports from the bottom of the direction. Thereby, a deformation | transformation of the strip | belt-shaped steel plate 36 can be suppressed.
From the viewpoint of guiding the strip steel plates 35 and 36 more stably, the guides 38a and 38b are respectively provided on the upper and lower sides in the vertical direction of the manufacturing apparatus of the spiral core for rotating electrical machines. You may make it support from. Moreover, when there is no deformation | transformation of the strip | belt-shaped steel plates 35 and 36, or when the deformation | transformation of the strip | belt-shaped steel plates 35 and 36 does not affect the quality of a spiral core, it is not necessary to necessarily use the guides 38a and 38b. Further, only one of the guides 38a and 38b may be used.

  The strain relief heating device 39 performs a strain relief heat treatment (SRA) online on the strip steel plate 36 wound around the core metal (not shown) of the spiral machining device 33 immediately after being processed by the spiral processing device 33. Is what you do. The strain relief heating device 39 is, for example, an induction heating furnace. Due to the processing of the strip steel plates 34, 35, and 36 described above, distortion (for example, punching distortion or bending distortion) is generated in the spiral core. This distortion may reduce the magnetic properties of the helical core. Therefore, the distortion generated in the spiral core can be removed by heating the spiral core with the strain relief heating device 39.

In this embodiment, the strain relief heat treatment is performed online. However, for example, the spiral core that has been subjected to the spiral processing is applied to the spiral core on a line different from the spiral core production line shown in FIG. 3 using an external heating device such as an induction furnace or a box furnace. Then, a strain relief heat treatment may be performed. In such a case, distortion caused by a joining method such as caulking, adhesion, or welding can be removed. The strain relief annealing as described above is preferably performed appropriately according to the characteristics required for the spiral core and the steel type of the strip steel plate 36. For example, the annealing temperature of the strain relief annealing is about 750 ° C.
Moreover, the manufacturing apparatus of the spiral core for rotating electrical machines according to the present embodiment is used when manufacturing not only the stator 11 of the first embodiment but also the stators 51, 71, 101 of the second to fourth embodiments. Can be applied similarly. Furthermore, the structure of this embodiment can also be applied to the manufacturing apparatus of the spiral core for rotating electrical machines of the fifth embodiment.

  It should be noted that the embodiments of the present invention described above are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. Is. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

10, 50, 70, 100 Rotating electrical machine 11, 51, 71, 101 Stator 12 Rotor 13 Case 14 Rotating shaft 15, 52, 72, 102 Break 21, 61, 81, 111 Strip steel plate 22, 63, 85, 114 Yoke part 23 Teeth part 24, 62, 82, 91-93, 112 Notch part 31 Shape processing device 32 Notch processing device 33 Spiral processing device 37 Heating device 38 Guide 39 Distortion removing heating device 53, 103 Hole

Claims (14)

A strip-shaped metal plate for forming a spiral core for forming a spiral core as a core provided in a rotating electrical machine,
A yoke portion extending in the longitudinal direction and having a linear portion at one end in the width direction;
A plurality of teeth portions formed at substantially equal intervals on the other end in the width direction of the yoke portion,
Notch portions are formed at a plurality of positions in the region between the two tooth portions adjacent to each other at the other end position in the width direction of the yoke portion,
A band-shaped metal plate for forming a spiral core, characterized in that when the yoke portion is curved in the width direction and processed into a spiral shape, the mutually opposed regions of the notch portion are combined. Each of the plurality of notches includes a first contour portion having both a distal end portion located at the deepest portion and one base end portion located at the other end in the width direction of the yoke portion, and the distal end portion. And a second contour portion having both ends of the other base end portion located at the other end in the width direction of the yoke portion,
At least one concave portion is formed in at least a part of the first contour portion, and at least one convex portion corresponding to the concave portion is formed in at least a portion of the second contour portion;
The length between the one base end portion and the other base end portion has a length corresponding to the difference between the outer peripheral length and the inner peripheral length of the spiral core,
When the first contour portion and the second contour portion are processed into a spiral shape and joined together, the concave portion formed in the first contour portion, and the concave portion of the second contour portion The band-shaped metal plate for forming a spiral core according to claim 1, wherein the concave portion and the convex portion are formed so that the convex portions formed at positions corresponding to each other are aligned with each other.   A plurality of concave portions are formed in the first contour portion, and the same number of convex portions as the concave portions formed in the first contour portion are formed in the second contour portion. The strip-shaped metal plate for forming a helical core according to claim 2.   The contoured contour length, which is the contour length of the notch, is not more than twice the contour-free contour length, which is the contour length of the notch when it is assumed that the concave portion and the convex portion are not formed. The strip-shaped metal plate for forming a spiral core according to claim 2, wherein the strip-shaped metal plate is provided.   The depth of the notch is 4/5 times or more the length in the width direction of the yoke portion, and is less than the length in the width direction of the yoke portion. The strip | belt-shaped metal plate for helical core formation of any one of these.   The strip-shaped metal plate for forming a spiral core according to any one of claims 1 to 5, wherein a shape of a deepest portion of the cutout portion is circular or elliptical. A spiral core of a rotating electrical machine obtained by bending a belt-shaped metal plate in the plate surface direction and processing it in a spiral shape,
A yoke extending in the circumferential direction, and a plurality of teeth extending in an axial direction from an end portion on the inner circumferential side of the yoke and positioned at substantially equal intervals in the inner circumferential direction of the yoke,
Cuts from the inner peripheral surface to the outer peripheral surface of the yoke are formed at each of a plurality of positions in the end portion on the inner peripheral side of the yoke and between the two adjacent teeth. And
The spiral core of a rotating electrical machine, wherein the mutually facing surfaces of the cut are combined.   The shape of the cut in the plane direction perpendicular to the axial center is a shape having a portion protruding in the circumferential direction with respect to a straight line connecting the leading end and the base end of the cut. The helical core of the described rotating electrical machine.   9. The shape of the cut in a plane direction perpendicular to the axial center is a shape having a plurality of portions projecting in the circumferential direction with respect to a straight line connecting the distal end and the base end of the cut. The spiral core of the rotating electrical machine according to 1.   The overhanging contour length, which is the length in the plane direction perpendicular to the axis of the cut, is assumed that the shape in the plane direction perpendicular to the axis is a straight line connecting the distal end and the base end of the cut The helical core of a rotating electrical machine according to claim 8 or 9, wherein the spiral core has a length of a non-extruded uncontoured length which is a length in a plane direction perpendicular to the axis of the cut.   The depth of the cut is 4/5 times or more the radial length of the yoke and less than the radial length of the yoke. The spiral core of the rotating electrical machine according to item 1.   The spiral core of the rotating electrical machine according to any one of claims 7 to 11, wherein a shape of a deepest region of the cut has a circular shape or an elliptical shape. The strip-shaped metal plate for forming a spiral core according to any one of claims 1 to 6, wherein the strip-shaped metal plate for forming a spiral core is curved in the plate surface direction and processed into a spiral shape, according to any one of claims 7 to 12. A method of manufacturing a spiral core for manufacturing a spiral core of a rotating electrical machine,
A plate surface shape processing step of cutting the strip-shaped metal plate to form the spiral core-forming strip-shaped metal plate;
And a spiral processing step of processing the strip-shaped metal plate for forming the spiral core in a spiral shape by curving it in the plate surface direction. The plate surface shape processing step includes the step of forming the yoke portion and the plurality of teeth portions;
Forming a predetermined number of the notches after the yoke portion and the plurality of teeth portions are formed, and
The method of manufacturing a spiral core according to claim 13, wherein in the spiral processing step, the strip-shaped metal plate for forming the spiral core is processed in a spiral shape in order from a portion where the notch is formed.

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