Rotating electrical machine core, rotating electrical machine using the same, and method for manufacturing the rotating electrical machine core

Abstract

A method for manufacturing a rotating electric machine core is provided, which can overcome the problem of local thermal deformation when laser cladding, for example, is applied as a local alloying method for non-magnetization of materials. The present invention provides a method for manufacturing a rotating electric machine core, comprising: a local alloying treatment step S1, in which a local alloying treatment is applied to the surface of a single and / or a predetermined number of stacked steel plates to reduce the leakage flux of the insulating film, thereby forming a local alloyed portion; a stamping / punching step S2, including a stamping step of stamping the local alloyed portion to make the plate thickness thinner than other parts of the stacked steel plate and a punching step of punching the stacked steel plate into the shape of the rotating electric machine core; and a stacking forming step S3, in which the portions of the stacked steel plates whose plate thickness has become thinner due to the stamping step are aligned and stacked in a manner to form a gap between them, and the other portions of the stacked steel plates are stacked in a state of being connected via the insulating film to form the rotating electric machine core.

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine core, a rotating electrical machine using the rotating electrical machine core, and a method for manufacturing the rotating electrical machine core. Background Art

[0002] In a rotating electric machine using an embedded magnet rotor, it is required to minimize the leakage flux around the permanent magnets in the rotor yoke to achieve high efficiency. In response to this requirement, a technology has been proposed in which a non-magnetic material is applied to the portion of the magnetic circuit corresponding to the leakage flux (for example, refer to Patent Document 1). In addition, a technology has been proposed in which a portion of the magnetic circuit corresponding to the eddy current is processed into a concave shape in the thickness direction to reduce the iron loss caused by the eddy current around the permanent magnets in the rotor yoke (for example, refer to Patent Document 2).

[0003] [Prior Technical Literature]

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 8-331784

[0006] Patent Document 2: Japanese Patent No. 4631361 Summary of the invention

[0007] [Problems to be solved by the invention]

[0008] However, a technology which is easier to manufacture and can reduce leakage flux more effectively than the technologies disclosed in Patent Documents 1 and 2 is desired.

[0009] The present invention is made in view of the above situation, and its purpose is to provide a rotating electric machine core, a rotating electric machine using the same, and a method for manufacturing the rotating electric machine core, which can overcome the problem of local thermal deformation that occurs in this case while applying laser cladding as a local alloying method for non-magnetizing the material.

[0010] [Technical means to solve the problem]

[0011] (1) A rotating electrical machine core (e.g., a rotor core 2 described below) is formed by laminating steel plates (e.g., laminating steel plates 3 described below) having leakage flux reduction portions (e.g., local alloyed portions 33 described below), wherein the laminating steel plates have insulating films (e.g., insulating films 32 described below) applied to the surfaces of a single lamination group and a predetermined number of lamination groups, and the leakage flux reduction portions constitute local alloyed portions (e.g., local alloyed portions 33 described below) that have been subjected to local alloying treatment, and the local alloyed portions are stamped into a shape that produces gaps between the lamination surfaces of the laminating steel plates.

[0012] (2) A rotating electrical machine (for example, a rotating electrical machine 1 described later) in which the stator or rotor thereof is constituted by the rotating electrical machine core described in (1) above.

[0013] (3) A method for manufacturing a rotating electrical machine core, comprising laminating and forming laminating steel plates (e.g., laminating steel plates 3 described below) having leakage flux reduction portions (e.g., local alloyed portions 33 described below) to manufacture a rotating electrical machine core (e.g., a rotor core 2 described below), comprising: a local alloying treatment step (e.g., local alloying treatment step S1 described below) of forming local alloyed portions (e.g., local alloyed portions 33 described below) by performing a local alloying treatment on the leakage flux reduction portions to which an insulating film (e.g., insulating film 32 described below) is applied on the surface of a single laminating steel plate and / or a predetermined number of laminating groups. ; a stamping / punching process (for example, the stamping / punching process S2 described later), including a stamping process of stamping the aforementioned local alloyed portion to obtain a plate thickness thinner than other portions of the aforementioned laminated steel plate, and a punching process of punching the aforementioned laminated steel plate into the shape of the aforementioned rotating motor core; and a stacking forming process (for example, the stacking forming process S3 described later), aligning and stacking the portions of the aforementioned laminated steel plate whose plate thickness has become thinner due to the aforementioned stamping process, so as to form gaps between them, and stacking the aforementioned other portions of the aforementioned laminated steel plate in a state of being in contact with each other via the aforementioned insulating film, thereby forming a rotating motor core.

[0014] (Effects of the Invention)

[0015] (1) According to the rotating electric machine core disclosed in the present invention, an insulating film is applied to the surface of a single stacked steel plate and a predetermined number of stacked groups, and a local alloyed portion formed by performing a local alloying treatment on the leakage flux reduction target portion is formed by a stamping process, so that a gap appears between the local alloyed portions of the stacked surface of the stacked steel plate. The large insulation resistance brought by the air in the gap can be used to ensure electrical insulation, and the reduction in motor efficiency caused by eddy currents can be suppressed. That is, the electrical insulation of the leakage flux reduction portion where the local alloying treatment is performed to reduce the leakage flux but the insulating film is destroyed can be maintained at a high level. Therefore, a rotating electric machine core can be provided, which compresses the plate thickness to cope with the local thermal deformation of the stacked steel plate caused by the local alloying treatment, has high dimensional accuracy and ensures centrifugal strength, and can further achieve the reduction of leakage flux and the suppression of eddy currents.

[0016] In the rotating electric machine of (2), a rotating electric machine core composed of laminated steel plates whose thickness is reduced in corresponding parts to cope with local thermal deformation is applied to effectively reduce leakage flux and eddy current, thereby realizing a small and energy-efficient rotating electric machine.

[0017] In the method for manufacturing a rotating electric machine core of (3), the non-magnetic properties of the target area for reducing the leakage magnetic flux are promoted by a local alloying process, and in the stacking forming process, the thinned areas of the stacking steel plates that have been thinned and punched into a specified shape by a stamping / punching process are aligned and stacked to form gaps between them. Thus, the large insulation resistance brought by the air in the gap can be used to ensure electrical insulation, and the reduction in motor efficiency caused by eddy currents can be suppressed. In addition, a rotating electric machine can be manufactured, which can reduce the leakage magnetic flux by maintaining the magnetic resistance of the flux reduction area that has been subjected to the local alloying treatment at a high level, and the area that has been thermally deformed by the local alloying treatment is thinned by the stamping process, and is small and energy efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram showing a part of a lamination steel plate used in a rotor core constituting a rotating electric machine core of the rotating electric machine of the present disclosure.

[0019] Figure 2 It is explained in Figure 1 Diagram of the magnetic path of leakage flux generated near the part where the rotor core and stator face each other.

[0020] Figure 3 It is a description of Figure 1 A diagram showing a state in which a portion of a laminated steel plate that has been subjected to a local alloying treatment is subjected to a stamping process.

[0021] Figure 4A This is a diagram showing a portion of a lamination steel plate where a local alloying treatment has been performed.

[0022] Figure 4B Is the implementation of the drawing Figure 4A A diagram showing the situation where a stamping process is performed on a part that has been locally alloyed.

[0023] Figure 4C It is included in the drawing Figure 4B This is a diagram showing how a slot is formed by punching, including the extended protruding portion during the stamping process.

[0024] Figure 5A This is a diagram showing a portion of a lamination steel plate where a local alloying treatment has been performed.

[0025] Figure 5B It is shown in the implementation Figure 5A A diagram showing the formation of slots by punching after local alloying treatment.

[0026] Figure 5C Is the implementation of the drawing Figure 5AA diagram showing the situation where a stamping process is performed on a part that has been locally alloyed.

[0027] Figure 5D This is a diagram showing the use of punching to Figure 5C A diagram showing the situation in which the extended escape portion is formed during the stamping process.

[0028] Fig. 6A This is a diagram showing a portion of a lamination steel plate where a local alloying treatment has been performed.

[0029] Figure 6B is drawn for the Fig. 6A FIG. 1 is a diagram showing a state in which a slot is formed by punching a portion of a portion expanded when a local alloying treatment is performed.

[0030] Figure 6C It is to show the cause Figure 6B This figure shows the situation where the yoke portion whose width has become narrower than the specified width due to the punching process is subjected to stamping.

[0031] Figure 7 This is a schematic diagram showing how the rotating electrical machine core of the present disclosure is constructed by laminating steel plates.

[0032] Figure 8 The present invention is a process diagram showing the processes included in the method for manufacturing a rotating electrical machine core of the present disclosure. DETAILED DESCRIPTION

[0033] Next, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals. Figure 1 FIG. 1 is a diagram showing a portion of a lamination steel plate 3 used in a rotor core 2 constituting a rotary electric machine 1 of the present disclosure. Figure 2 It is explained in Figure 1 A diagram of the magnetic path of leakage flux generated near the opposing portion of the rotor core 2 and the stator core 8. The rotary electric machine 1 disclosed in the present invention is a so-called interior permanent magnet (IPM) motor used in electric vehicles, etc. A plurality of magnets 4 are housed in parallel in the circumferential direction near the outer periphery of the rotor core 2.

[0034] The rotor core 2 is formed by laminating a plurality of laminating steel plates 3 with their main surfaces joined together. Slots 5 for receiving and holding magnets 4 are formed facing the outer peripheral surface of the rotor core 2. The shape portion constituting the slots 5 in the laminating steel plates 3 is also appropriately referred to as slots 5 below. The magnets 4 are held in the rotor core 2 to form a rotor 6 of the rotating electrical machine 1.

[0035] In the rotating electrical machine 1 as an IPM motor, in order to ensure the centrifugal strength of the rotor 6, a reinforcing rib 7 is provided near the magnet 4 in the laminating steel plate 3 to connect the outer circumference and the inner circumference of the slot 5 in the radial direction. When the rotating electrical machine 1 is operated, a return magnetic flux as a leakage magnetic flux Lf is generated on the reinforcing rib 7, and the effective magnetic flux Ef that generates torque by interacting with the magnetic flux generated by the coil 9 on the stator core 8 side is offset, thereby deteriorating the performance of the rotating electrical machine 1.

[0036] In order to suppress the leakage magnetic flux Lf of the reinforcing rib 7, it is also possible to consider making the reinforcing rib 7 as thin as possible. However, in this scheme, the mechanical strength of the reinforcing rib 7 will decrease, which will cause problems in ensuring the centrifugal strength. Therefore, it is effective to demagnetize the reinforcing rib 7. In this case, it is not necessarily limited to complete demagnetization, as long as the magnetic permeability is greatly reduced to the extent that the leakage magnetic flux Lf is reduced, there will be a corresponding effect.

[0037] The non-magnetic treatment of the reinforcing rib 7 is performed, for example, by laser cladding a non-magnetic forming element on the laminating steel plate 3 as the electromagnetic steel plate. However, this will add substances other than the electromagnetic steel plate, so deformation (i.e., local thermal deformation) will occur. In addition, the heat generated by the laser cladding will destroy the insulating film 32 on the surface of the laminating steel plate 3 (see Figure 3 ).

[0038] If the insulating film 32 on the surface of the laminating steel plate 3 is damaged, the electrical insulation in the thickness direction of the plate will be lost during the laminating of the laminating steel plate 3 when forming the rotor 6, so that motor loss (iron loss) caused by eddy current will occur, and the motor efficiency will deteriorate. In addition, the deformation caused by laser cladding mainly increases the plate thickness, so that the dimensions required when the laminating steel plate 3 is laminated when forming the rotor 6 can no longer be met.

[0039] Therefore, in the rotor core 2 as the rotating electric machine core of the present disclosure, the plate thickness of the laser clad portion after laser cladding is reduced by stamping. By stamping the laser clad portion so that the plate thickness is thinner than that of the non-laser clad portion, the stacking forming dimensions when forming the rotor core 2 can be met. At the same time, the gaps between the plates when the stacking steel plates 3 are stacked can be utilized to ensure electrical insulation with the large insulation resistance brought by air, and the reduction in motor efficiency caused by eddy currents can be suppressed.

[0040] Figure 3 It is a description of Figure 1FIG. 1 is a diagram showing a state where a portion of a laminating steel plate 3 that has been subjected to a local alloying treatment is subjected to a stamping process. The laminating steel plate 3 has an insulating film 32 applied to an electromagnetic steel plate 31 as a raw material. The local alloyed portion 33 subjected to the local alloying treatment is thermally deformed and bulges in the thickness direction, and the insulating film 32 is destroyed. The thermally deformed local alloyed portion 33 is stamped from both sides in the direction of the plate thickness using the same press machine 10 while the laminating steel plate 3 is stamped into the shape of the rotor core 2.

[0041] The thickness of the partially alloyed portion 33 subjected to the stamping process becomes thinner than the original thickness of the electromagnetic steel sheet 31 as the raw material of the lamination steel sheet 3. The thinned portions of the lamination steel sheets 3 are aligned and stacked so as to form gaps between them. The portions where the insulation film 32 is destroyed also have a high insulation effect due to the large insulation resistance provided by the air due to the gaps formed in this way.

[0042] Next, refer to Figure 4A , Figure 4B and Figure 4C , an example of a processing step of performing a press process on a portion of the laminating steel plate 3 that has been subjected to a local alloying treatment, and then forming a slot (slot 5 for holding the magnet 4) by punching is described. Figure 4A The local alloying part 33 formed by performing a local alloying treatment on the lamination steel plate 3 is shown in FIG. Figure 3 As described above, the local alloyed portion 33 is thermally deformed and bulges in the thickness direction, which increases the thickness of the portion when the laminating steel plates 3 are laminated to form the rotor core 2, thereby preventing regular laminating in which the surfaces are closely attached to each other. That is, when the rotor core 2 is formed, the predetermined dimensions related to the laminating steel plates 3 can no longer be met.

[0043] Therefore, if Figure 4B In the process, the local alloyed portion 33 is crushed by the punch 11 (punch) of the press machine 10 to a thickness smaller than that of the surrounding portion of the laminated steel plate 3 that is not subjected to the local alloying treatment. Figure 4B During the processing, when the heat-deformed local alloyed portion 33 is compressed in the thickness direction, a bulge 34 may be generated around the local alloyed portion 33 where material escapes and bulges in the thickness direction. Figure 4B It is produced by expanding on the front side and the depth side of the paper.

[0044] By Figure 4C Processing in Figure 4BThe protruding portion 34 that escapes and expands during the stamping process is punched out by the punching die 12 of the press machine 10 to form the shape of the slot 5 of the rotor core 2. As a result, the portion that protrudes unnecessarily in the thickness direction is removed from the main surface of the laminating steel plate 3, so that the laminating steel plates 3 can be closely stacked and formed to form a rotor core 2 of a regular size.

[0045] Since the compression of the thickness of the raised portion 34 and the punching process into the shape of the slot 5 are performed by the same press machine 10 punching die 11 (punch) and blanking die 12, the Figure 4B Processing and Figure 4C Since these steps are performed as a single process, the rotary electric machine 1 can be manufactured efficiently and at low cost.

[0046] Next, refer to Figure 5A , Figure 5B , Figure 5C and Figure 5D Another example of the processing steps of forming the slots 5 of the rotor core 2 by punching and pressing the portions of the laminating steel plates 3 that have been partially alloyed will be described below. Figure 5A The local alloying part 33 formed by performing a local alloying treatment on the lamination steel plate 3 is shown in FIG. Figure 3 As described above, the local alloyed portion 33 is thermally deformed and bulges in the thickness direction, which increases the thickness dimension of the portion when the laminating steel plates 3 are laminated to form the rotor core 2, thereby preventing normal lamination in which surfaces are closely attached to each other.

[0047] In this processing step, secondly, as Figure 5B In the process, the periphery of the partially alloyed portion 33 is punched out by the punching die 12 of the press machine 10 to form the shape of the slot 5 .

[0048] Furthermore, by Figure 5C The processing in Figure 5B In the processing step, the locally alloyed portion 33 which is bulged in the thickness direction due to thermal deformation is crushed by the punch 11 (punch) of the press machine 10 to a thickness smaller than that of the portion not subjected to the local alloying treatment. Figure 5C When the heat-deformed local alloyed portion 33 is compressed in the thickness direction during processing, a portion where material escapes and expands in the surface direction may occur around the local alloyed portion 33. The portion expanding in the surface direction may also be Figure 5C It is produced by expanding on the front side and the depth side of the paper.

[0049] By Figure 5DIn the processing, the punching die 12a of the press machine 10 is used to punch the Figure 5C The portion that escapes and expands in the plane direction during the stamping process is punched out to adjust the plane shape. In this way, the portion that protrudes unnecessarily in the thickness direction is removed from the main surface of the laminating steel plate 3, so that the laminating steel plates 3 can be closely stacked and formed to form a rotor core 2 of a regular size. In addition, it is sometimes unnecessary to remove the portion that protrudes unnecessarily in the thickness direction. Figure 5C The part that escapes during the stamping process and expands in the surface direction. In this case, it is no longer necessary to perform Figure 5D processing steps.

[0050] Since the compression of the thickness of the raised portion 34 and the punching process into the shape of the slot 5 are performed by the same press machine 10 punching die 11 (punch) and blanking die 12, the Figure 5B The processing steps to Figure 5D The processing steps are performed as the same process, so the rotating electrical machine 1 can be manufactured efficiently and at low cost.

[0051] Next, refer to Fig. 6A , Figure 6B and Figure 6C , another example of a processing step of performing a press process on the portion of the laminating steel plate 3 that has been subjected to a local alloying treatment, and then forming the slots 5 of the rotor core 2 by punching is described. Fig. 6A The local alloying part 33 formed by performing a local alloying treatment on the lamination steel plate 3 is shown in FIG. Figure 3 As described above, the local alloyed portion 33 is thermally deformed and bulges in the thickness direction, which increases the thickness dimension of the portion when the laminating steel plates 3 are laminated to form the rotor core 2, thereby preventing normal lamination in which surfaces are closely attached to each other.

[0052] Secondly, if Figure 6B In the process, the punching die 12 of the press machine 10 is used to punch out a part of the outer edge of the contour of the local alloyed portion 33 itself, thereby forming the shape of the slot 5. Figure 6B In the state after the processing step, the local alloyed portion 33 is slightly smaller than the predetermined plane projection shape size.

[0053] Furthermore, by Figure 6C The processing in Figure 6B In the processing step, the local alloyed portion 33 which remains in a state of being bulged in the thickness direction due to thermal deformation is crushed by the punch 11 (punch) of the press machine 10 to a thickness dimension smaller than that of the portion not subjected to the local alloying treatment. Figure 6CDuring the processing, when the thermally deformed local alloyed portion 33 is compressed in the thickness direction, the material around the local alloyed portion 33 escapes and expands in the surface direction. Figure 6B After the processing step, the local alloyed portion 33 becomes slightly smaller than the predetermined plane projection shape size. Figure 6C The processing in the plane expands in the surface direction and becomes the predetermined plane projection shape and size.

[0054] Since the compression of the thickness of the raised portion 34 and the punching process into the shape of the slot 5 are performed by the same press machine 10 punching die 11 (punch) and blanking die 12, the Figure 6B The processing steps to Figure 6C The processing steps are performed as the same process, so the rotating electrical machine 1 can be manufactured efficiently and at low cost.

[0055] Figure 7 Schematic diagram showing a state where the laminating steel plates 3 are laminated to form the rotating electrical machine core (one example of which is the rotor core 2) of the present disclosure. Figure 3 As described, the laminated steel sheet 3 is an electromagnetic steel sheet 31 to which an insulating film 32 is applied, and a portion of the laminated steel sheet 3 is a local alloyed portion 33. Although the insulating film 32 is destroyed, the local alloyed portions 33 are subjected to stamping, and the plate thickness is thinner than the original thickness of the electromagnetic steel sheet 31 as the raw material of the laminated steel sheet 3. The thinned portions of the laminated steel sheet 3 are aligned and laminated so as to form gaps between them. The other portions of the laminated steel sheet 3 are laminated in a state of being in contact with each other via the insulating film 32. The portions where the insulating film 32 is locally destroyed also have a high insulation effect due to the large insulation resistance brought by the air due to the gaps formed as described above.

[0056] Next, with regard to the steps included in the method for manufacturing a rotating electrical machine core of the present disclosure, appropriate reference will be made to the process diagrams thereof. Figure 8 The rotating electric machine core manufacturing method disclosed in the present invention is to manufacture the rotating electric machine core (one example of which is the rotor core 2 ) by laminating and forming laminating steel plates having a leakage flux reduction portion.

[0057] First, in the local alloying step S1 , a local alloying treatment is performed on a leakage flux reduction target portion where the insulating film 32 is applied on the surface of a single lamination steel sheet 3 and / or a predetermined number of lamination groups to form a local alloyed portion.

[0058] Next, in the stamping / punching step S2, the local alloyed portion 33 is stamped to be thinner than other portions of the laminated steel plate 3, and the laminated steel plate 3 is punched into a predetermined shape. Figure 4B and Figure 4C As described above, the punching process is performed after the punching process, but it can also be performed as above for Figure 5B and Figure 5C ,or Figure 6B and Figure 6C As described above, the punching process is performed first, and then the press process is performed.

[0059] In the stacking forming step S3, as shown in FIG. Figure 7 As described, the local alloyed portions 33 whose plate thickness has been thinned by the stamping process in the stamping / blanking step S2 are aligned and stacked so as to form gaps between them, and the other portions of the stacked steel plates 3 are stacked and formed in a state of being connected via an insulating film 32 to form a rotating electrical machine core (rotor core 2).

[0060] According to the rotary electric machine 1 of the present disclosure, the following effects are achieved.

[0061] According to the rotating electric machine core (rotor core 2) of (1), the insulating film 32 is applied to the surface of a single and a predetermined number of stacked groups of the stacked steel plates 3, and the local alloyed portion (local alloyed portion 33) formed by local alloying treatment of the leakage flux reduction target portion is formed by stamping, so that a gap is formed between the local alloyed portions of the stacked surface of the stacked steel plates 3. The large insulation resistance brought by the air in the gap can be used to ensure electrical insulation, and the reduction of motor efficiency caused by eddy current can be suppressed. That is, the electrical insulation of the leakage flux reduction portion where the local alloying treatment for reducing the leakage flux is implemented but the insulating film 32 is destroyed can be maintained at a high level. Therefore, a rotating electric machine core (rotor core 2) can be provided, wherein the plate thickness is compressed to cope with the local thermal deformation of the stacked steel plates 3 caused by the local alloying treatment, the dimensional accuracy is high, the centrifugal strength is ensured, and the leakage flux can be reduced and the eddy current can be suppressed.

[0062] In the rotating electric machine 1 of (2), a rotating electric machine core (rotor core 2) is applied which is composed of laminated steel plates which effectively reduce leakage flux and eddy current and have the plate thickness of corresponding parts compressed to cope with local thermal deformation, thereby realizing a small and energy-efficient rotating electric machine 1.

[0063] In the method for manufacturing a rotating electric machine core of (3), the non-magnetic properties of the target area for reducing the leakage magnetic flux are promoted by the local alloying treatment step S1, and in the stacking forming step S3, the thinned areas of the stacking steel plates that have been thinned and punched into a specified shape by the stamping / punching step S2 are aligned and stacked to form gaps between them. Thus, the large insulation resistance brought by the air in the gap can be used to ensure electrical insulation, and the reduction in motor efficiency caused by eddy currents can be suppressed. In addition, a rotating electric machine can be manufactured, which can reduce the leakage magnetic flux by maintaining the magnetic resistance of the flux reduction area that has been subjected to the local alloying treatment at a high level, and the area that has been thermally deformed by the local alloying treatment is thinned by the stamping process, and is small and energy efficient.

[0064] The above description is directed to the rotary electric machine core disclosed in the present invention, the rotary electric machine using the rotary electric machine core, and the method for manufacturing the rotary electric machine core, but the present invention is not limited thereto. The detailed structure may be appropriately changed within the scope of the gist of the present invention. For example, the above description is directed to the case where the rotary electric machine is an IPM motor, but when the rotary electric machine is an IPM generator, the same function and effect can be achieved by using substantially the same structure.

[0065] Reference numerals

[0066] 1: Rotating motor

[0067] 2: Rotor core

[0068] 3: Steel plate for lamination

[0069] 4: Magnet

[0070] 5: Slot

[0071] 6: Rotor

[0072] 7: Reinforcement

[0073] 8: Stator core

[0074] 9: Coil

[0075] 10: Press

[0076] 11: Dies for stamping

[0077] 12,12a: Punching die

[0078] 31: Magnetic steel plate

[0079] 32: Insulation film

[0080] 33: Local alloying area

[0081] 34: Raised area

Claims

1. A rotating electrical machine core, formed by laminating steel sheets having a leakage flux reduction portion, The above-mentioned laminated steel sheet has an insulating coating applied on the surface of a single layer or a predetermined number of laminated layers, and the leakage flux reduction area constitutes a local alloyed portion subjected to a local alloying treatment. The local alloyed portion is pressed into a shape that creates a gap between the lamination surfaces of the lamination steel sheet.

2. A rotating electrical machine, wherein the rotating electrical machine core according to claim 1 constitutes its stator or rotor.

3. A method for manufacturing a rotating electrical machine core, comprising laminating and forming laminating steel sheets having a leakage flux reduction portion to manufacture the rotating electrical machine core, comprising: A local alloying treatment step of forming a local alloyed portion by performing a local alloying treatment on a portion to be reduced in magnetic leakage flux on which an insulating film is applied on the surface of a single laminated steel sheet and / or a predetermined number of laminated groups; a stamping / punching step, including a stamping step of stamping the aforementioned local alloyed portion to have a plate thickness thinner than other portions of the aforementioned laminated steel plate, and a punching step of punching the aforementioned laminated steel plate into the shape of the aforementioned rotating electrical machine core; and, In the stacking forming step, the portions of the stacking steel plates whose thickness has become thinner due to the stamping step are aligned and stacked so as to form gaps between them, and the other portions of the stacking steel plates are stacked in a state of being connected with each other via the insulating film, thereby forming a rotating motor core.

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