JP2013062892A - Rotary electric machine and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that applies tensile stress precisely to a stator core (stator) so as to achieve the effect of reducing core loss, and to provide a method for manufacturing the same.SOLUTION: A rotary electric machine 1 includes: a stator core 5 that has laminated magnetic steel sheets 6; a frame 3 into which the stator core 5 is fitted for mounting; and a rotor 8 that is arranged concentrically with the stator core 5 with a predetermined air gap therebetween. Clearance 17 is provided between an outer edge of the stator core 5 and an inner edge of the frame 3, and an adhesive 19 is filled in the clearance 17 so as to fix the stator core 5 to the frame 3. With the stator core 5 mounted to the frame 3, there is a difference of 0.1 mm or more between an inside diameter of the frame 3 and an outside diameter of the stator core 5 in a position where the frame 3 and the stator core 5 face each other radially.

Description

  The present invention relates to a rotating electrical machine including a stator and a rotor that rotates inside the stator, and more particularly, to a rotating electrical machine that can reduce iron loss of the stator and a manufacturing method thereof.

This type of rotating electrical machine converts electrical energy into rotational force or converts rotational force into electrical energy. However, in recent years, this conversion efficiency can be effectively improved from the viewpoint of efficient use of energy. It is desired. Here, although the efficiency of such a rotating electrical machine is influenced by various factors, iron loss, which is a loss generated in the stator, occupies a relatively large proportion. And in order to reduce the iron loss which generate | occur | produces in this stator, it was common to use the special electromagnetic steel plate with less iron loss for the material used for a stator. For example, the iron loss of the rotating machine itself can be reduced by using an electromagnetic steel sheet having a lower iron loss than 50A1000, such as 50A400, instead of the 50A1000 electromagnetic steel sheet for iron core specified by JISC2555. However, electromagnetic steel sheets with low iron loss are generally expensive, and there is a problem that the price of a rotating machine that uses them is high.

 By the way, it is known from Non-Patent Document 1 and the like that iron loss increases when compressive stress is applied to an electromagnetic steel sheet, but iron loss is reduced when tensile stress is applied. And as what utilizes the characteristic of this electromagnetic steel plate, for example, in Patent Document 1, the yoke portion is set so that the temperature difference between the outer peripheral portion and the inner peripheral portion of the yoke portion of the stator core (stator) becomes 10 to 300 ° C. A stator core and a method for manufacturing the stator core are disclosed in which a predetermined tensile stress is applied in the direction in which the magnetic flux passes by heating the outer peripheral portion or the inner peripheral portion of the magnetic core and then cooling it. According to this, the iron loss of the stator can be reduced without using an expensive special electromagnetic steel sheet.

Nippon Steel Technical Report No. 378, 2003, p. 53, FIG. JP 2003-319618 A

By the way, in the stator core manufacturing method described in Patent Document 1, the magnetic properties are improved by heat-treating the stator core formed by laminating electromagnetic steel sheets. For example, the outer peripheral portion of the yoke portion or When heating the inner peripheral part, if the heating state varies, the tensile stress applied to the electromagnetic steel sheet constituting it will vary, which may impair the magnetic property improvement characteristics. There was a risk of it occurring. Further, there is a problem that the magnetic steel sheets located at both ends of the stator core are likely to warp, and the magnetic characteristics of the stator core may be deteriorated due to the distortion. That is, there is a problem that the magnetic characteristics are difficult to stabilize because the tensile stress is likely to vary.

  In order to cope with such a problem, the present invention provides a rotating electrical machine capable of accurately applying a tensile stress to a stator formed by laminating a plurality of electromagnetic steel sheets and obtaining an effect of reducing iron loss, and its manufacture It is intended to provide a method.

In order to solve the above-mentioned problem, the invention according to claim 1 is arranged concentrically with a stator core formed by laminating electromagnetic steel sheets, a frame for fitting and mounting the stator core, and a predetermined gap with the stator core. A rotary electric machine including a rotor, wherein a gap is provided between an outer peripheral portion of the stator core and an inner peripheral portion of the frame, and an adhesive is filled in the gap to fix the stator core to the frame. The difference between the inner diameter dimension of the frame and the outer diameter dimension of the stator core at a radially opposing position when the stator core is mounted on the frame is 0.1 mm or more.

 According to this, since the adhesive filled between the outer peripheral portion of the stator core and the inner peripheral portion of the frame is cured and the volume thereof is reduced, the inner periphery of the frame is inward and the outer periphery of the stator core is outward. Be pulled. As a result, a tensile stress is generated in the electromagnetic steel sheet constituting the stator core, and the iron loss can be reduced. Since the difference between the inner diameter dimension of the frame and the outer diameter dimension of the stator core is 0.1 mm or more, an adhesive layer of an adhesive can be reliably provided in the gap between the frame inner periphery and the stator core outer periphery. The outer periphery of the stator core can be reliably pulled without variation. That is, the iron loss of the electrical steel sheet constituting the stator core can be accurately reduced.

The invention according to claim 2 includes a stator core configured by stacking electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of screw holes are provided on the outer periphery of the stator core at equal intervals in the circumferential direction, and a gap is provided between the outer peripheral portion of the stator core and the inner peripheral portion of the frame. A plurality of bolts are respectively attached to the holes from the outside of the frame, and the stator core is attached to the frame while being pulled toward the frame side in the radial direction by the plurality of bolts.
According to this, since the outer periphery of the stator core can be accurately pulled to the outside by the plurality of bolts, the iron loss of the electrical steel sheet constituting the stator core can be reduced accurately.

According to a third aspect of the present invention, in the rotating electrical machine according to the second aspect, the difference between the inner diameter dimension of the frame and the outer diameter dimension of the stator core at a radially opposing position when the stator core is attached to the frame. It shall be 0.1 mm or more.
According to this, since a gap can be reliably provided between the inner periphery of the frame and the outer periphery of the stator core, the outer periphery of the stator core can be reliably pulled without variation. That is, a tensile stress can be generated in the electromagnetic steel sheet constituting the stator core, and the iron loss can be accurately reduced.

The invention according to claim 4 includes a stator core configured by stacking electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of screw holes are provided on the outer periphery of the stator core at equal intervals over the circumferential direction, and between the inner periphery of the frame and the outer periphery of the stator core facing the screw holes of the stator core. A gap is provided, a plurality of bolts are respectively attached to the screw holes of the stator core from the outside of the frame through the gap, and the stator core is attached to the frame while being pulled toward the frame in the radial direction by the bolts. Attached.
According to this, since the outer periphery of the stator core can be pulled outward by the plurality of bolts passing through the gap portions, tensile stress is generated in the electromagnetic steel sheet constituting the stator core, and the iron loss is accurately reduced. can do.

According to a fifth aspect of the present invention, in the rotating electric machine according to the second or fourth aspect, the screw hole is provided in a screw member attached to an outer peripheral portion of the stator core.
According to this, the screw hole can be easily formed in the outer peripheral portion of the stator core.
The invention according to claim 6 includes a stator core configured by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor disposed concentrically with the stator core with a predetermined gap. A plurality of bolts are provided on the outer periphery of the stator core at equal intervals over the circumferential direction in the radial direction, and a gap is provided between the outer peripheral portion of the stator core and the inner peripheral portion of the frame, A plurality of bolts are tightened with nuts from the outside of the frame, and the stator core is attached to the frame while being pulled toward the frame by the plurality of bolts.
According to this, since the outer periphery of the stator core can be accurately pulled outward by the plurality of bolts by tightening the nut, the iron loss of the electrical steel sheet constituting the stator core can be accurately reduced. .

 The invention according to claim 7 includes a stator core formed by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of bolts are provided on the outer periphery of the stator core at equal intervals in the radial direction in the circumferential direction, and the inner peripheral portion of the frame facing the bolt base provided on the stator core and the stator core A gap portion is provided between the outer peripheral portions, nuts are fastened to the plurality of bolts from the outside of the frame, and the stator core is attached to the frame while being pulled toward the frame side by the plurality of bolts.

According to this, by tightening the nut, the outer periphery of the stator core can be accurately pulled outward by the plurality of bolts provided with bolt base portions in the gap portions. The loss can be accurately reduced.
The invention according to claim 8 includes a stator core configured by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor disposed concentrically with the stator core with a predetermined gap. The electromagnetic steel sheet constituting the stator core is provided with a plurality of protrusions that protrude along the radial direction on the outer peripheral portion thereof and are provided at equal intervals in the circumferential direction. Are formed, and the stator core is attached to the frame while pulling a plurality of the laminated protrusions toward the frame.

According to this, since the outer periphery of the stator core can be accurately pulled to the outside by the plurality of stacked projecting portions, the iron loss of the electrical steel sheet constituting the stator core can be reduced accurately.
The invention according to claim 9 includes a stator core configured by stacking electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of screw holes are provided on the outer periphery of the stator core at equal intervals in the circumferential direction, and a gap is provided between the outer peripheral portion of the stator core and the inner peripheral portion of the frame. A tension member that is threaded on one end side is attached to the hole, tension means for pulling the tension member toward the outside of the frame is provided, and the stator core is pulled toward the frame side in the radial direction by the plurality of tension members. However, it is attached to the frame.
According to this, since the outer periphery of the stator core can be accurately pulled outward by the plurality of tension members, the iron loss of the electromagnetic steel sheet constituting the stator core can be reduced accurately.

The invention according to claim 10 is the rotating electrical machine according to any one of claims 2 to 5, further comprising a spring through which the bolt is inserted outside the frame, and the bolt is used to attach the bolt to the frame. By pulling outward, the stator core is pulled toward the frame by the plurality of bolts.
According to this, since the outer periphery of the stator core can be pulled to the outside with less variation by the plurality of bolts urged toward the outside of the frame by the spring, the electrical steel sheets constituting the stator core Iron loss can be accurately reduced.
The invention according to claim 11 is the rotating electrical machine according to claim 8, wherein the spring is inserted through the stacked protruding portion protruding outside the frame, and the spring is inserted into the frame at the tip of the stacked protruding portion. And a spring holding member that is sandwiched therebetween, and pulling the laminated projection toward the outside of the frame by the spring, thereby pulling the stator core toward the frame by the plurality of laminated projections.

According to this, since the outer periphery of the stator core can be accurately pulled outward by the stacked projecting portion urged to the outside of the frame by the spring, the iron loss of the electrical steel sheets constituting the stator core can be accurately determined. Can be reduced.
According to a twelfth aspect of the present invention, in the rotating electrical machine according to the ninth aspect, the tension means includes a spring that passes through the tension member protruding outside the frame, and the spring at the other end of the tension member. And a stopper member sandwiched between the frame and the frame, and pulling the tension member toward the outside of the frame by the spring, thereby pulling the stator core to the frame side by the plurality of tension members.
According to this, since the outer periphery of the stator core can be accurately pulled outward by the tension member biased to the outside of the frame by the spring, the iron loss of the electrical steel sheet constituting the stator core is accurately determined. Can be reduced.

According to a thirteenth aspect of the present invention, in the rotating electrical machine according to any one of the first to twelfth aspects, a material having a higher thermal expansion coefficient than the stator core is used as a material of the frame.
According to this, since the frame expands larger than the stator core and spreads outward due to heat generated during operation of the rotating electrical machine, a force pulling the outer periphery of the stator core is generated, and the iron of the electromagnetic steel sheet constituting the stator core The loss can be accurately reduced.
The invention according to claim 14 is the method of manufacturing a rotating electrical machine according to any one of claims 1 to 12, wherein the temperature difference is maintained so that the temperature of the stator core is higher than that of the frame. The stator core is incorporated into the frame.
According to this, since the stator core is incorporated in the frame so that the temperature of the stator core is higher than that of the frame at the time of manufacture, when these temperatures are the same, the stator core is compared with the frame. An event that shrinks will occur. As a result, a force that pulls the outer periphery of the stator core outward is generated as a result, so that the iron loss of the electromagnetic steel sheet constituting the stator core can be reduced accurately.

According to a fifteenth aspect of the present invention, there is provided a stator core configured by laminating electromagnetic steel sheets, a frame in which the stator core is fitted and mounted, and a rotor that is concentrically disposed with a predetermined gap from the stator core. In the manufacturing method of a rotating electrical machine provided, a gap is provided between an outer peripheral part of the stator core and an inner peripheral part of the frame, and the stator is fixed to the frame by filling the gap with an adhesive. The stator core is incorporated into the frame while maintaining a temperature difference so that the temperature of the stator core is higher than that of the frame.
According to this, similarly to the invention according to claim 14, the iron loss of the electrical steel sheet constituting the stator core can be accurately reduced.

According to a sixteenth aspect of the present invention, there is provided a stator core formed by laminating electromagnetic steel sheets, a frame in which the stator core is fitted and mounted, and a rotor that is concentrically arranged with a predetermined gap from the stator core. A rotating electrical machine provided with a gap between an outer peripheral portion of the stator core and an inner peripheral portion of the frame, and filling the gap with an adhesive to fix the stator to the frame. A material having a higher thermal expansion coefficient than the stator core is used.
According to this, similarly to the invention according to claim 13, the iron loss of the electrical steel sheet constituting the stator core can be accurately reduced.

As described above, according to the invention according to any one of claims 1 to 16, by appropriately pulling the outer periphery of the stator core to the outside, a tensile stress is generated in the electrical steel sheet constituting the stator core, and the iron loss is reduced. Therefore, it is possible to provide a rotating electrical machine capable of obtaining an effect of reducing iron loss generated in the stator core and a method for manufacturing the same.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the rotary electric machine concerning 1st Embodiment (The clearance gap is provided between the frame inner periphery and the stator core outer periphery, and the adhesive agent is apply | coated to this clearance gap) to which this invention is applied, (a) is front one side. Sectional drawing and (b) are side surface sectional drawings. It is side surface sectional drawing which shows the rotary electric machine which concerns on 2nd Embodiment (what fixed the flame | frame and the stator core using the volt | bolt) to which this invention is applied. FIG. 6 is a side cross-sectional view showing a rotating electrical machine according to a third embodiment to which the present invention is applied (provided that a plurality of screw holes are provided on the outer periphery of the stator core and a recess is formed on the inner peripheral side of the frame facing the screw holes); is there. It is side surface sectional drawing which shows the rotary electric machine which concerns on 4th Embodiment (what replaced with the screw hole processing of a stator core outer periphery, and attached the nut) to which this invention is applied. It is side surface sectional drawing which shows the rotary electric machine which concerns on 5th Embodiment (what processed the concave groove part in order to make it easy to attach a nut to a stator core outer periphery) to which this invention is applied. It is side surface sectional drawing which shows the rotary electric machine which concerns on 6th Embodiment (it replaces with the screw hole processing of a stator core outer periphery, attaches a nut, and forms a recessed part in the inner peripheral side of the flame | frame facing the nut) which applies this invention. is there. It is side surface sectional drawing which shows the rotary electric machine which concerns on 7th Embodiment (The several bolt is welded and provided in the circumferential direction on the outer periphery of a stator core) to which this invention is applied. It is side surface sectional drawing which shows the rotary electric machine which concerns on 8th Embodiment (it forms a recessed part in the inner peripheral side of the flame | frame facing the base part of the volt | bolt provided in the stator core) to which this invention is applied. It is side surface sectional drawing which shows the rotary electric machine which concerns on 9th Embodiment (The electromagnetic steel plate which comprises a stator core is provided with the some protrusion part provided in the outer peripheral part) to which this invention is applied. It is side surface sectional drawing which shows the rotary electric machine which concerns on 10th Embodiment (it is provided with the spring by which a volt | bolt is penetrated by the frame outer side, and this spring is pinched | interposed by a flame | frame and a bolt head) to which this invention is applied. Eleventh embodiment to which the present invention is applied (a spring is provided on the outer side of the frame, the spring is sandwiched between the frame and the bolt head, and a recess is formed on the inner peripheral side of the frame facing the nut into which the bolt is screwed) It is side surface sectional drawing which shows the rotary electric machine which concerns on. It is side surface sectional drawing which shows the rotary electric machine which concerns on 12th Embodiment (those with which the several tension member is attached to the screw hole of a stator core outer peripheral part at equal intervals in the circumferential direction) to which this invention is applied.

  Embodiments of a rotating electrical machine to which the present invention is applied will be described below with reference to the drawings. 1A and 1B are diagrams showing a rotating electrical machine 1 according to a first embodiment to which the present invention is applied, in which FIG. 1A is a front (longitudinal) one-side sectional view, and FIG. 1B is a side sectional view. As shown in the figure, the rotating electrical machine 1 includes a rotating shaft 10, a cylindrical rotor (rotor) 8 provided around the rotating shaft 10 so as to rotate integrally therewith, and an outer side of the rotor 8. An annular stator core (stator) 5 concentrically disposed with a predetermined gap, a cylindrical frame 3 on which the stator core 5 is mounted, and a bracket 4 that closes both ends of the frame 3. And a bearing 12 mounted on each bracket 4 at both ends of the frame 3 to rotatably support the rotary shaft 10, a mounting base 15 provided on the lower side of the frame 3, and the like.

  In the rotating electrical machine 1, a gap 17 is provided between the inner periphery of the frame 3 and the outer periphery of the stator core 5, and an adhesive 19 is applied to the gap 17. Since the volume of the adhesive 19 is reduced when the adhesive 19 is cured, when the adhesive 19 applied to the gap 17 between the inner periphery of the frame 3 and the outer periphery of the stator core 5 is cured, the inner periphery of the frame 3 is pulled inside and the outer periphery of the stator core 5 is pulled outward. . For this reason, tensile stress is generated in the outer periphery of the stator core 5. Here, since the stator core 5 is configured by laminating the electromagnetic steel plates 6 in the longitudinal direction of the rotating shaft 10, tensile stress acts on the electromagnetic steel plates 6 when the outer periphery of the stator core 5 is pulled outward. And since this electromagnetic steel plate 6 has the characteristic that an iron loss reduces when tensile stress acts, the rotary electric machine 1 comprised in this way can reduce an iron loss exactly.

  Further, the difference between the inner diameter dimension of the frame 3 and the outer diameter dimension of the stator core 5 is set to 0.1 mm or more at the radially opposing position when the stator core 5 is attached to the frame 3, so that the inner circumference of the frame 3 and the stator core 5 are increased. Since the adhesive layer can be reliably provided in the outer circumferential gap 17, it is possible to provide the rotating electrical machine 1 that can reduce the iron loss accurately by reducing the variation of the tensile stress generated in the outer peripheral portion of the stator core 5. If the adhesive 19 is not reliably applied to the gap 17 between the inner periphery of the frame 3 and the outer periphery of the stator core 5, there are places where the adhesive 19 is present and where there is no adhesive 19 in the circumferential direction. Since a situation occurs in which the ratio differs for each product (individual), the tensile stress generated in the outer periphery of the stator core 5 varies for each product. Therefore, although the iron loss itself of the rotating electrical machine 1 is reduced, there arises a problem that the characteristics vary from product to product.

  FIG. 2 is a side sectional view showing a rotating electrical machine 1 according to a second embodiment to which the present invention is applied. (Since the front view is substantially the same as that shown in the first embodiment, it will be omitted in the following description.) As shown in the figure, the rotating electrical machine 1 includes the frame 3, the stator core 5, and the bolt 21. It is fixed using. In the rotating electrical machine 1, the screw hole 23 is machined in the outer periphery of the stator core 5, and the outer periphery of the stator core 5 is tightened with the bolt 21 while the gap 17 is generated between the inner periphery of the frame 3 and the outer periphery of the stator core 5. A tensile stress is applied. In addition, the screw hole 23 processing is provided in the outer periphery of the stator core 5 at equal intervals so that each is located on the opposite side of the other screw holes 23. Even if each screw hole 23 is not positioned on the opposite side of the other screw hole, if the screw cores 23 are arranged at equal intervals on the outer periphery of the stator core 5, the tightening force by the respective bolts 21 can be held evenly and the stator core 5. The tensile stress applied to the outer peripheral portion can be made uniform, and the iron loss can be reduced without variation.

  Further, at the radially opposing position when the stator core 5 is attached to the frame 3, the difference between the inner diameter dimension of the frame 3 and the outer diameter dimension of the stator core 5 is 0.1 mm or more, so that the inner periphery of the frame 3 and the outer periphery of the stator core 5 Since the gap 17 can be provided between the stator core 5 and the stator core 5, the outer periphery of the stator core 5 can be reliably pulled without variation. That is, it is possible to provide the rotating electrical machine 1 capable of generating a tensile stress in the electromagnetic steel plate 6 constituting the stator core 5 and accurately reducing the iron loss.

 FIG. 3 is a side sectional view showing a rotating electrical machine 1 according to a third embodiment to which the present invention is applied. As shown in the figure, the rotating electrical machine 1 is provided with a plurality of screw holes 23 on the outer periphery of the stator core 5 at equal intervals in the circumferential direction, and a recess 18 on the inner peripheral side of the frame 3 facing the screw holes 23 of the stator core. Forming a gap portion 20 between the outer periphery of the stator core 5 and attaching a plurality of bolts 21 to the screw holes 23 of the stator core 5 through the gap portion 20. Thus, it is attached to the frame 3 while being pulled toward the frame 3 in the radial direction. According to this, since the outer periphery of the stator core 5 can be pulled outward by the plurality of bolts 21 passing through the gap portions 20, a tensile stress is generated in the electromagnetic steel sheet 6 constituting the stator core 5, and the iron loss is accurately determined. Can be reduced.

  FIG. 4 is a side sectional view showing a rotating electrical machine 1 according to a fourth embodiment to which the present invention is applied. As shown in the figure, this rotating electrical machine 1 is provided with a nut (screw member) 25 instead of the screw hole 23 processing of the rotating electrical machine 1 according to the second embodiment. FIG. 5 is a side sectional view showing the rotating electrical machine 1 according to the fifth embodiment to which the present invention is applied, and in order to make it easy to attach the nut 25 according to the fourth embodiment of the present invention. The concave groove portion 26 is processed on the outer peripheral portion. According to these, the screw hole portion can be easily formed in the outer peripheral portion of the stator core 5.

 FIG. 6 is a side sectional view showing a rotating electrical machine 1 according to a sixth embodiment to which the present invention is applied. As shown in the figure, this rotating electrical machine 1 is provided with a nut (screw member) 25 instead of the screw hole 23 processing of the rotating electrical machine 1 according to the third embodiment of the present invention. According to this, similarly to the third embodiment, the outer periphery of the stator core 5 can be pulled outward by the plurality of bolts 21 passing through the gap portion 20, so that tensile stress is applied to the electromagnetic steel sheet 6 constituting the stator core 5. The iron loss can be accurately reduced.

  FIG. 7 is a side sectional view showing a rotating electrical machine 1 according to a seventh embodiment to which the present invention is applied. As shown in the figure, the rotating electrical machine 1 is provided with a plurality of bolts 22 welded to the outer periphery of the stator core 5 in the circumferential direction, and a gap 17 is provided between the outer periphery of the stator core 5 and the inner periphery of the frame 3. Nuts 27 are fastened to the plurality of bolts 22 from the outside of the frame 3, and the stator core 5 is attached to the frame 3 while being pulled toward the frame 3 by the plurality of bolts 22. In addition, these bolts 22 are provided in radial direction at equal intervals so that each may be located in the outer peripheral part of the stator core 5 on the opposite side of the other bolts 22. Even when the bolts 22 are not positioned on the opposite side of the other bolts 22, if the bolts 22 are arranged at equal intervals on the outer periphery of the stator core 5, the tightening force by the nuts 27 attached to the bolts 22 can be kept even. Thus, the tensile stress applied to the outer periphery of the stator core 5 can be made uniform, and the iron loss can be reduced without variation.

 FIG. 8 is a side sectional view showing a rotary electric machine 1 according to an eighth embodiment to which the present invention is applied. As shown in the figure, the rotating electrical machine 1 is provided with a plurality of bolts 22 on the outer periphery of the stator core 5 in the circumferential direction and the frame facing the base of the bolts 22 provided on the stator core 5 as in the seventh embodiment. By forming the recess 18 on the inner peripheral side of 3, a gap 20 is provided between the outer periphery of the stator core 5, and nuts 27 are tightened from the outside of the frame 3 to a plurality of bolts 22 passing through the gap 20, The stator core 5 is attached to the frame 3 while being pulled toward the frame 3 by a plurality of bolts 22. According to this, since the outer periphery of the stator core 5 can be pulled outward by the plurality of bolts 22 by tightening the nuts 27 from the outside of the frame 3 to the plurality of bolts 22 passing through the gap portions 20, the stator core 5 is configured. A tensile stress can be produced in the electromagnetic steel sheet 6 and the iron loss can be reduced accurately.

 FIG. 9 is a side sectional view showing a rotating electrical machine 1 according to a ninth embodiment to which the present invention is applied. As shown in the figure, in this rotating electrical machine 1, the electromagnetic steel plate 6 constituting the stator core 5 includes a plurality of protruding portions 6 a that protrude along the radial direction on the outer peripheral portion thereof and are provided at equal intervals in the circumferential direction. Thus, a plurality of laminated protrusions 29 are formed on the stator core 5, and the stator core 5 is attached to the frame 3 while pulling the plurality of laminated protrusions 29 to the frame 3 side by a coil spring (spring) 31 or the like. According to this, since the outer periphery of the stator core 5 can be accurately pulled to the outside by the plurality of laminated protrusions 29, the iron loss of the electromagnetic steel sheet 6 constituting the stator core 5 can be accurately reduced.

 In addition, the coil spring 31 of this embodiment is provided so that the lamination | stacking protrusion part 29 which protrudes on the flame | frame 3 outer side may be penetrated, and the stopper member (spring holding member) provided in the front-end | tip part of the flame | frame 3 and the lamination | stacking protrusion part 29 is provided. By being sandwiched by 32, the laminated projecting portion 29 is pulled toward the outside of the frame 3, and the outer peripheral portion of the stator core 5 is pulled toward the frame 3 side.

  FIG. 10 is a side sectional view showing a rotating electrical machine 1 according to a tenth embodiment to which the present invention is applied. As shown in the figure, this rotating electrical machine 1 is provided with a spring 35 through which a bolt 21 is inserted outside the frame 3 in the rotating electrical machine 1 according to the second embodiment of the present invention. The bolt 21 is pulled toward the outside of the frame 3 by being pinched by the portion 21 a, and the outer peripheral portion of the stator core 5 is pulled toward the frame 3 by the plurality of bolts 21. According to this, since the outer periphery of the stator core 5 can be pulled to the outside with less variation by the repulsive force of the spring 35 instead of the tightening force of the bolt 21, the iron loss of the electrical steel sheet 6 constituting the stator core 5 can be reduced. Can be accurately reduced.

 FIG. 11 is a side sectional view showing a rotating electrical machine 1 according to an eleventh embodiment to which the present invention is applied. As shown in the drawing, this rotating electrical machine 1 is provided with a spring 35 through which a bolt 21 is inserted outside the frame 3 in the rotating electrical machine 1 according to the sixth embodiment of the present invention. The bolt 21 is pulled toward the outside of the frame 3 by being sandwiched between the heads 21a, and the outer periphery of the stator core 5 is pulled toward the frame 3 by the plurality of bolts 21. According to this, similarly to the rotating electrical machine 1 according to the tenth embodiment of the present invention, the outer periphery of the stator core 5 is reduced to the outside by the repulsive force of the spring 35 instead of the tightening force of the bolt 21. Since it can be pulled, the iron loss of the electromagnetic steel sheet 6 constituting the stator core 5 can be accurately reduced.

In the rotary electric machine 1 according to the third embodiment to which the present invention is applied (see FIG. 3), an eleventh embodiment to which the present invention is applied is provided with a spring 35 through which the bolt 21 is inserted outside the frame 3. The same operation and effect as the rotary electric machine 1 according to the embodiment can be obtained.
FIG. 12 is a side sectional view showing a rotating electrical machine 1 according to a twelfth embodiment to which the present invention is applied. As shown in the figure, the rotating electrical machine 1 has a screw hole 23 machined on the outer periphery of the stator core 5, and a plurality of rod-like tension members 24 are arranged at equal intervals in the circumferential direction along the radial direction. It is attached. A spring (tensioning means) 36 through which the tension member 24 communicates with the outside of the frame 3 is provided, and the spring 36 is sandwiched by a stopper member (tensioning means) 37 attached to the end of the frame 3 and the tensile walking material 24. Thus, the tension member 24 is pulled toward the outside of the frame 3, and the outer peripheral portion of the stator core 5 is pulled toward the frame 3 by the plurality of tension members 24. According to this, because the repulsive force of the spring 36 can pull the outer periphery of the stator core 5 to the outside with less variation, the iron loss of the electromagnetic steel plate 6 constituting the stator core 5 can be reduced accurately. Note that the tension members 24 are provided at equal intervals on the outer peripheral portion of the stator core 5 so as to be located on the opposite side of the other tension members 24. Further, even when the respective tension members 24 are not positioned on the opposite side of the other tensile gait 24, if the tension members 24 are arranged at equal intervals in the outer peripheral portion of the stator core 5, the repulsive force by the respective springs 36 is uniformly maintained, The tensile stress applied to the outer periphery of the stator core 5 can be made uniform, and the iron loss can be reduced without variation.

 In each rotating electrical machine according to the first to twelfth embodiments to which the present invention is applied, it is desirable to use a material having a higher thermal expansion coefficient than the stator core 5 as the material of the frame 3. According to this, the heat generated during operation of the rotating electrical machine 1 causes the frame 3 to expand larger than the stator core 5 and spread outward, thereby generating a force that pulls the outer periphery of the stator core 3 to the outside. The iron loss of 6 can be accurately reduced.

Further, in each method of manufacturing the rotating electrical machine 1 according to the first to twelfth embodiments to which the present invention is applied, the stator core 5 is held in a state where the temperature difference is maintained so that the temperature of the stator core 5 is higher than that of the frame 3. It is desirable to incorporate it into the frame 3. According to this, since the stator core 5 is incorporated in the frame 3 so that the temperature of the stator core 5 is higher than that of the frame 3 at the time of manufacture, the stator core 5 is more in comparison with the frame 3 when these temperatures are the same. Occurs. As a result, a force that pulls the outer periphery of the stator core 5 to the outside is generated as a result, so that the iron loss of the electromagnetic steel sheet 6 constituting the stator core 5 can be accurately reduced.
As described above, according to the rotating electrical machine and the manufacturing method thereof according to the embodiment to which the present invention is applied, the tensile stress is generated in the electrical steel sheet constituting the stator core by accurately pulling the outer periphery of the stator core to the outside. Since the iron loss can be reduced, it is possible to provide a rotating electrical machine capable of obtaining an effect of reducing the iron loss generated in the stator core and a manufacturing method thereof.

  Needless to say, the present invention is not limited to the rotating electrical machine 1 shown in the present embodiment, and application changes can be made within the scope of the gist. For example, a stator core 5 formed by laminating a plurality of electromagnetic steel plates 6, a frame 3 on which the stator core 5 is mounted, bolts 21, 22 or tension members 24 for attaching the stator core 5 to the frame 3, bolts 21, 22 or tension members 24 The arrangement configuration, shape, and the like of the springs 31, 35 that are biased toward the frame 3 are appropriately set according to the specifications of the individual rotating electrical machines 1, and are not limited to the present embodiment.

1 Rotating electrical machine 3 Frame 5 Stator core (stator)
6 Magnetic steel sheet 6a Protruding part 8 Rotor (rotor)
17 Gap 19 Adhesive 20 Gap portion 21 Bolt 22 Bolt 23 Screw hole 24 Tension member 25 Nut (screw member)
27 Nut 29 Laminated Projection 31 Coil Spring (Spring)
32 Stopper member (spring holding member)
35 Spring 36 Spring (Tensioning means)
37 Stopper member (Tensioning means)

Claims (15)

A rotating electrical machine comprising: a stator core configured by laminating electromagnetic steel sheets; a frame in which the stator core is fitted and mounted; and a rotor that is concentrically disposed with the stator core and a predetermined gap. A gap is provided between the outer peripheral part of the frame and the inner peripheral part of the frame, and the stator core is fixed to the frame by filling the gap with an adhesive. A rotating electrical machine characterized in that a difference between an inner diameter dimension of the frame and an outer diameter dimension of the stator core at a position is 0.1 mm or more.   A rotating electrical machine comprising a stator core configured by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of screw holes are provided on the outer periphery at equal intervals in the circumferential direction, and a gap is provided between the outer peripheral portion of the stator core and the inner peripheral portion of the frame, and a plurality of bolts are formed in the screw holes of the stator core from the outside of the frame. And the stator core is attached to the frame while being pulled toward the frame in the radial direction by the plurality of bolts.   The rotating electrical machine according to claim 2, wherein a difference between an inner diameter dimension of the frame and an outer diameter dimension of the stator core at a radially opposing position when the stator core is attached to the frame is 0.1 mm or more.   A rotating electrical machine comprising a stator core configured by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of screw holes are provided on the outer periphery at equal intervals in the circumferential direction, and a gap portion is provided between the inner peripheral portion of the frame and the outer peripheral portion of the stator core facing the screw holes of the stator core. A plurality of bolts are respectively attached to the screw holes of the stator core from the outside of the frame, and the stator core is attached to the frame while being pulled toward the frame side in the radial direction by the plurality of bolts.   The rotating electrical machine according to claim 2, wherein the screw hole is provided in a screw member attached to an outer peripheral portion of the stator core.   A rotating electrical machine comprising a stator core configured by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of bolts are provided on the outer periphery at equal intervals in the circumferential direction in the radial direction, and a gap is provided between the outer peripheral portion of the stator core and the inner peripheral portion of the frame, and the plurality of bolts are provided from the outside of the frame. A rotating electrical machine, wherein a nut is tightened and the stator core is attached to the frame while being pulled toward the frame by a plurality of bolts. A rotating electrical machine comprising a stator core configured by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of bolts are provided on the outer periphery at equal intervals in the radial direction in the radial direction, and a gap is provided between the inner periphery of the frame and the outer periphery of the stator core facing the bolt base provided on the stator core. A rotating electrical machine characterized in that a plurality of bolts are tightened with nuts from the outside of the frame, and the stator core is attached to the frame while being pulled toward the frame by the plurality of bolts. A rotating electrical machine comprising: a stator core configured by laminating electromagnetic steel sheets; a frame for attaching the stator core inward; and a rotor disposed concentrically with the stator core with a predetermined gap; The electromagnetic steel sheet to be configured protrudes along the radial direction on the outer peripheral portion thereof, and includes a plurality of protruding portions provided at equal intervals in the circumferential direction, thereby forming a plurality of stacked protruding portions on the stator core, A rotating electric machine characterized in that the stator core is attached to the frame while pulling the laminated protrusion toward the frame. A rotating electrical machine comprising a stator core configured by laminating electromagnetic steel sheets, a frame for attaching the stator core inward, and a rotor arranged concentrically with the stator core with a predetermined gap. A plurality of screw holes are provided on the outer periphery at equal intervals in the circumferential direction, a gap is provided between the outer peripheral portion of the stator core and the inner peripheral portion of the frame, and screw processing is performed on one end side of the screw hole of the stator core. And a tension means for pulling the tension member toward the outside of the frame. The stator core is attached to the frame while being pulled toward the frame side in the radial direction by the plurality of tension members. Rotating electric machine. A spring for inserting the bolt is provided outside the frame, and the stator core is pulled toward the frame by the plurality of bolts by pulling the bolt toward the outside of the frame by the spring. The rotating electrical machine according to claim 2. The tension means includes a spring that passes through the tension member protruding outside the frame, and a stopper member that sandwiches the spring with the frame at the other end of the tension member. 10. The rotating electrical machine according to claim 9, wherein the stator core is pulled toward the frame by the plurality of tension members by pulling the wire toward the outside of the frame. The rotating electrical machine according to any one of claims 1 to 12, wherein a material having a higher thermal expansion coefficient than the stator core is used as a material of the frame. The method of manufacturing a rotating electrical machine according to any one of claims 1 to 12, wherein the stator core is incorporated into the frame in a state where a temperature difference is maintained so that the temperature of the stator core is higher than that of the frame. . A method of manufacturing a rotating electrical machine comprising: a stator core configured by laminating electromagnetic steel sheets; a frame in which the stator core is fitted and mounted; and a rotor that is concentrically disposed with a predetermined gap from the stator core. In the case where a gap is provided between the outer peripheral portion of the stator core and the inner peripheral portion of the frame, and the stator is fixed to the frame by filling the gap with an adhesive, the temperature of the stator core is higher than that of the frame. In this way, the stator core is incorporated into the frame while maintaining the temperature difference as described above. A rotating electrical machine comprising: a stator core configured by laminating electromagnetic steel sheets; a frame in which the stator core is fitted and mounted; and a rotor that is concentrically disposed with the stator core and a predetermined gap. A gap is provided between the outer periphery of the frame and the inner periphery of the frame, and the gap is filled with an adhesive to fix the stator to the frame. The material of the frame has a larger thermal expansion coefficient than the stator core. A rotating electrical machine characterized by using materials.