JP5060111B2 - Stator coil fixing member, stator coil fixing method, and rotating electric machine - Google Patents

Description

  The present invention relates to a coil fixing method for a rotary electric machine such as a turbine generator, and more particularly to a stator coil fixing member for fixing a stator coil in a stator core slot, a stator coil fixing method, and a rotary electric machine.

  In a rotating electrical machine such as a turbine generator, a component in which a stator coil inserted and placed in a slot of a stator core crosses a slot in a magnetic flux that uses the stator core as a magnetic path and a current that flows through the coil conductor itself. And vibrates by receiving an electromagnetic force twice the power frequency generated in the radial direction of the machine shaft. Therefore, it is preferable to fix the stator coil in a stable state in the slots of the stator core. Conventionally, for example, a technique for fixing the stator coil using a corrugated laminate is disclosed (for example, (See Patent Document 1).

  An example of this conventional method for fixing a stator coil will be described with reference to FIG. FIG. 8 is a view showing a cross section of a stator core slot in which a fixing member in a conventional rotating electrical machine is installed. As shown in FIG. 8, two stator coils 204 a and 204 b having a rectangular cross section in which the outer peripheral portion of the coil conductor 201 is covered with an insulating layer 202 above and below the stator core slot 200 having a rectangular cross section are inter-coil spacers. Are stacked via 205. The lower stator coil 204 b is disposed on the coil bottom spacer 206, and a lower wedge spacer 207 is installed on the upper stator coil 204 a, and the stator core is interposed via the lower wedge spacer 207. A wedge 208 is firmly driven into the opening of the slot 200. Furthermore, as shown in FIG. 8, a corrugated laminate 209 is driven as a fixing member into the gap between the inner side surface of the stator core slot 200 and the side surfaces of the stator coils 204a and 204b. In addition, instead of the corrugated laminate 209, a flat laminate may be driven. Further, for such a fixing member, selection and processing of materials are performed so as to satisfy workability at the time of manufacturing the generator and mechanical rigidity that can withstand a predetermined electromagnetic force.

In the above-described conventional stator coil fixing method, the stator coil and the fixing member are brought into contact with each other at a predetermined surface pressure, and the surface pressure generates a restraining force necessary to fix the stator coil. ing. Therefore, in order to generate sufficient restraining force for suppressing vibration of the stator coil against electromagnetic force applied to the stator coil during operation of the device, a material having higher rigidity is used. It is necessary to select. Further, in order to improve the cooling characteristics of the stator coil, it is necessary to increase the contact area between the stator coil and the fixing member to promote heat conduction. As a method of fixing a stator coil to solve these problems, conventionally, a method of fixing the stator coil by immersing the entire stator coil including the stator core slot in a liquid adhesive resin and then curing it by heating ( Full impregnation method) is disclosed (for example, see Patent Document 2).
JP-A-6-237549 Akinobu Nakayama etc., Development of Global Vaccum Pressure Impregnation insulation System for Turbine Generators, Proceedings World Geothermal congress 2000, p.3253-3257, 2000.

  However, in the stator coil fixing method using the conventional all-impregnation method described above, there are facilities such as an immersion tank for immersing the entire stator coil in an adhesive resin and a large heating furnace for storing the stator coil. Necessary. For this reason, there has been a problem that the equipment is increased in size and the equipment cost is increased.

  Accordingly, the present invention has been made to solve the above-described problem, and a stator coil fixing member, a stator coil fixing method, and a stator coil fixing method capable of easily and firmly fixing a stator coil in an iron core slot. An object is to provide a rotating electrical machine.

In order to achieve the above object, a stator coil fixing member of the present invention is a fixing member for fixing a stator coil housed in a stator core slot provided in a stator core of a rotating electrical machine, and is porous. A bag-shaped exterior member made of a membrane and sealed at the edges, a filler filled in the exterior member or cured by heating, and the exterior member and the stator core slot Or a plate-like insertion plate inserted between the stator coil and the exterior member .

  According to the fixing member of the stator coil, the exterior member is formed of a porous film, and a part of the filler filled in the exterior member through the porous film is transferred to the surface of the exterior member, that is, the fixing member. It can be exuded and cured on the surface. Thus, the stator coil can be firmly fixed in the stator core slot.

The stator coil fixing portion method of the present invention is a method for fixing a stator coil housed in a stator core slot provided in a stator core of a rotating electric machine, and is a bag-shaped exterior member made of a porous film. A fixing member forming step of filling a predetermined amount of a filler that is cured at room temperature or by heating, sealing an end of the exterior member to form a fixing member, and at least fixing the fixing member A fixing member inserting step of inserting into a gap between a side surface of the stator coil housed in a core core slot and an inner side surface of the stator core slot; and between the fixing member and the stator core slot, or An insertion plate insertion step of inserting a plate-like insertion plate between the stator coil and the fixing member, and a wedge is driven into the opening of the stator core slot, and the filler is placed on the surface of the fixing member. Exuding the part And post-cured, characterized by comprising a stator coil fixing step of fixing the stator coil.

  According to this method of fixing a stator coil, a fixed member is formed by filling a predetermined amount of a filler that is cured by room temperature or heating into a bag-shaped exterior member made of a porous film, A part of the filler can be leached through the porous film on the surface and then cured. Thus, the stator coil can be firmly fixed in the stator core slot.

The stator coil fixing portion method of the present invention is a method for fixing a stator coil housed in a stator core slot provided in a stator core of a rotating electrical machine, wherein an end made of a porous film has an end side. An exterior member inserting step of inserting the sealed bag-shaped exterior member into at least a gap between a side surface of the stator coil housed in the stator core slot and an inner surface of the stator core slot; A fixed member forming step of forming a fixed member by injecting a predetermined amount of a filler that hardens upon heating into the inserted exterior member , or between the fixed member and the stator core slot, or An insertion plate insertion step of inserting a plate-shaped insertion plate between the stator coil and the fixing member, a wedge is driven into the opening of the stator core slot, and the filler is placed on the surface of the fixing member. Exuding a part So then cured, characterized by comprising a stator coil fixing step of fixing the stator coil.

  According to this stator coil fixing method, the bag-shaped exterior member made of a porous film is inserted into the gap between the side surface of the stator coil installed in the stator core slot and the inner side surface of the stator core slot. Then, a filling material that is cured at room temperature or by heating is injected into the exterior member to form a fixing member, and a part of the filler is oozed out through a porous film on the surface of the fixing member, and then cured. be able to. Thus, the stator coil can be firmly fixed in the stator core slot.

  According to the stator coil fixing member, the stator coil fixing method, and the rotating electrical machine of the present invention, the stator coil in the iron core slot can be firmly fixed easily.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing a cross section of a stator core slot 41 in a rotating electrical machine 10 in which fixing members 20a, 20b, 20c, 20d, and 20e according to an embodiment of the present invention are installed. FIG. 2 is a perspective view showing an appearance of the fixing member 20a according to the embodiment of the present invention. FIG. 3 is a view showing a cross section of the fixing member 20a.

  As shown in FIG. 1, in a stator core slot 41 formed in a stator core 40 of a rotating electrical machine 10, two stator coils 52a and 52b having a rectangular cross section covering a coil conductor 50 with an insulating layer 51 are provided. In a state of being stacked via the fixing member 20d that also functions as a spacer, the stacked member 20 is installed on the fixing member 20c that also functions as a spacer provided on the bottom surface of the stator core slot 41. Further, fixing members 20a and 20b for fixing the stator coils 52a and 52b are disposed between one side surface of the stator coils 52a and 52b and the inner side surface 42 of the stator core slot 41. Yes. Furthermore, a wedge 60 is driven into the opening of the stator core slot 41 through a fixing member 20e that also functions as a spacer installed on the stator coil 52a.

  Next, the configuration of the fixing members 20a, 20b, 20c, 20d, and 20e will be described with reference to FIGS. Since the fixing member 20a, the fixing member 20b, the fixing member 20c, the fixing member 20d, and the fixing member 20e have the same configuration, the configuration of the fixing member 20a will be described here.

  As shown in FIGS. 2 and 3, the fixing member 20 a includes a bag-shaped exterior member 21 having a rectangular parallelepiped shape whose end is sealed, and a filler 22 filled in the exterior member 21. Yes.

  The exterior member 21 is formed of a porous film having a plurality of holes that allow a part of the filler 22 filled therein to ooze out on the surface of the exterior member 21. The exterior member 21 is formed of a porous film having a plurality of holes made of, for example, polytetrafluoroethylene (PTFE) resin, polyimide resin, or the like. Specifically, for example, Poreflon (manufactured by Sumitomo Electric), Upilex PT (manufactured by Ube Industries), and the like can be mentioned, but are not limited thereto. Moreover, it is preferable that the hole diameter of the hole in a porous membrane is 0.2 micrometer-4 micrometers. More preferably, it is 0.45 μm to 3 μm. Here, it is preferable that the range of the pore diameter in the porous membrane is within this range. When the pore diameter is less than 0.2 μm, a part of the filler 22 filled in the exterior member 21 is necessary. This is because when the amount cannot be leached onto the surface of the exterior member 21 and the hole diameter exceeds 4 μm, the filler 22 filled in the exterior member 21 exudes a predetermined amount or more. In addition, the hole diameter of the hole in a porous film is calculated | required as an average hole diameter by processing the image obtained from an electron micrograph, for example.

  Moreover, the porous film which comprises the exterior member 21 may be comprised by the porous body structure which has several through-hole penetrated in the thickness direction of a film | membrane. In addition, the porous membrane has a porous structure having a pore structure in which a plurality of pores are entangled in the thickness direction of the membrane, that is, a plurality of pores without linearly opening in the thickness direction of the membrane. May be constituted by a porous porous structure having a pore structure communicating in a complicated manner.

Also, IPA (isopropyl alcohol) flow through the porous membrane ^is preferably 8ml / (min · cm 2) ~90ml / (min · cm 2). The IPA flow rate through the porous membrane is an index representing the permeability of the membrane. When isopropyl alcohol is passed through the porous membrane, per unit area (cm ² ) and unit time (min). Flow rate (ml) flowing. Here, it is preferable IPA flow rate of the porous membrane is ^{8ml / (min · cm 2)} ~90ml / (min · cm 2) , when the IPA flow rate is below 8ml / (min · cm ²⁾ If the required amount of the filler 22 filled in the exterior member 21 cannot be exuded on the surface of the exterior member 21 and the IPA flow rate exceeds 90 ml / (min · cm ² ), This is because the filler 22 filled in the exterior member 21 exudes a predetermined amount or more. The thickness of the porous film is not particularly limited, but is about 15 to 100 μm.

  Further, the exterior member 21 is formed by forming the above-described porous film into a bag shape having a rectangular parallelepiped shape and sealing each end side. As shown in FIG. 1, when the fixing member 20a is disposed between one side surface of the stator coils 52a and 52b and the inner side surface 42 of the stator core slot 41, the longitudinal direction of the exterior member 21 The length H (see FIG. 2) is set slightly longer than the radial length of the stator coils 52a and 52b. The length H is set slightly longer than the radial length of the stator coils 52a and 52b, as shown in FIG. 1, in which the fixing members 20c, 20d, and 20e are fixed to the stator coils 52a and 52b. In this case, it is formed to be equal to or slightly shorter than the circumferential length. Therefore, for example, when the fixing members 20c, 20d, and 20e are formed to have a length substantially equal to the circumferential length of the stator core slot 41, the longitudinal length H of the exterior member 21 is The coils 52a and 52b are formed to be equal to or slightly shorter than the length in the radial direction. Further, the lateral length L (see FIG. 2) of the exterior member 21 is set to be equal to or less than the axial length of the stator core slot 41. Note that the exterior member 21 may be arranged in a plurality of parts along the axial direction of the stator core slot 41.

  The filler 22 is a liquid that cures at room temperature or when heated and has a predetermined viscosity. The viscosity of the filler 22 is preferably 100 to 15000 mPa · sec, and more preferably 1000 to 5000 mPa · sec. Here, the reason why the viscosity of the filler 22 is preferably 100 to 15000 mPa · sec is that when the viscosity is less than 100 mPa · sec, the filler exudes a predetermined amount or more, and the viscosity is 15000 mPa · s. -If it exceeds sec, the filler does not bleed out by a predetermined amount. Moreover, since the heat from the stator coil 52a is conducted to the stator core 40 through the fixing member 20a, mainly the filler 22, the filler 22 is preferably excellent in thermal conductivity. Therefore, the thermal conductivity of the filler 22 is preferably 0.1 W / (m · K) or more. As a material constituting the filler 22, for example, an epoxy resin or a silicone resin is used. Specifically, for example, a resin in which an amine-based curing agent is blended with an epoxy resin at a predetermined ratio, a two-part silicone resin, and the like, which satisfy the characteristics required as the filler 22 described above. If you can, you can use it.

  Next, a method of fixing the stator coils 15a and 15b by the fixing members 20a, 20b, 20c, 20d, and 20e will be described with reference to FIGS. 1, 3, 4A, and 4B.

  FIG. 4A is a view showing a cross section of the stator core slot 41 in a state in which the stator coil 52b and the fixing members 20b and 20c are provided. FIG. 4B is a diagram illustrating a cross section of the stator core slot 41 in a state where the stator coils 52a and 52b and the fixing members 20a, 20b, 20c, and 20d are provided.

  First, as shown in FIG. 3, a predetermined amount of filler 22 is filled in a bag-shaped exterior member 21 made of a porous film, and the edges of the exterior member 21 are sealed to fix the fixing members 20a, 20b, 20c. , 20d, 20e. In addition, the edge of the exterior member 21 is sealed by bonding the porous films together using, for example, a heat-resistant epoxy adhesive or hot melt resin.

  Subsequently, the fixing member 20 c is inserted from the opening of the stator core slot 41, and the fixing member 20 c is installed on the bottom surface of the stator core slot 41. Subsequently, the stator coil 52b is installed on the fixing member 20c (see FIG. 4A). At this time, the stator coil 52 b is installed so that one side surface of the stator coil 52 b is in contact with any one of the inner side surfaces 42 of the stator core slot 41.

  Subsequently, the fixing member 20b described above is inserted into the gap between the side surface of the stator coil 52b and the inner side surface 42 of the stator core slot 41 (see FIG. 4A). In order to accurately insert the fixing member 20b into a predetermined position, it is preferable to insert the fixing member 20b using an insertion jig when the fixing member 20b is inserted. As this insertion jig, for example, a thin wedge-shaped temporary spacer material is used, and this temporary spacer material is strongly inserted into the gap between the side surface of the stator coil 52b and the inner side surface 42 of the stator core slot 41 and fixed in the generated gap. The member 20b is inserted.

  Subsequently, the fixing member 20d is installed on the stator coil 52b, and the stator coil 52a is installed on the fixing member 20d (see FIG. 4B). At this time, the stator coil 52 a is installed so that one side surface of the stator coil 52 a is in contact with one of the inner side surfaces 42 of the stator core slot 41. In consideration of conducting heat from the stator coils 52a and 52b to the stator core 40, the stator coil 52a and the stator coil 52b are different from each other in the stator core slot 41 from the viewpoint of heat balance. It is preferable that the stator coil 52a and the stator coil 52b are disposed so as to contact the side surface 42.

  Subsequently, the fixing member 20a described above is inserted into the gap between the side surface of the stator coil 52a and the inner side surface 42 of the stator core slot 41 (see FIG. 4B). As in the case of inserting the fixing member 20b, it is preferable to insert the fixing member 20a using an insertion jig or the like when the fixing member 20a is inserted in order to insert the fixing member 20a accurately at a predetermined position.

  Subsequently, the fixing member 20e is installed on the stator coil 52a, and the wedge 60 is driven into the opening of the stator core slot 41 via the fixing member 20e, and the stator coils 52a and 52b are inserted into the stator core slot 41. The fixing members 20a, 20b, 20c, 20d, and 20e are pressed (see FIG. 1) while being fixed at a predetermined position in the vertical direction, that is, in the radial direction. At this time, a predetermined amount of the inside of each fixing member 20a, 20b, 20c, 20d, 20e from the inside of each fixing member 20a, 20b, 20c, 20d, 20e through the hole of the porous film that is the exterior member 21 The filler 22 exudes. And the filler 22 is hardened and the stator coils 52a and 52b are fixed.

  Here, for example, the fixing member 20a inserted into the gap between the side surface of the stator coil 52a and the inner side surface 42 of the stator core slot 41 will be described as an example. The side surface of the stator coil 52a and one of the fixing member 20a The filler 22 that exudes and hardens between the surface and between the inner surface 42 of the stator core slot 41 and the other surface of the fixing member 20a, so that the filler 22 functions as an adhesive layer. A thin film is formed. That is, between the side surface of the stator coil 52a and one surface of the fixing member 20a, and between the inner side surface 42 of the stator core slot 41 and the other surface of the fixing member 20a, air having low thermal conductivity. No layer is formed, and a thin film of the filler 22 is formed with a substantially uniform thickness. Accordingly, heat conduction from the stator coil 52a to the fixing member 20a and from the fixing member 20a to the stator core 40 can be promoted, and heat generated in the stator coil 52a is efficiently dissipated to the stator core 40. be able to. Furthermore, since the stator coil 52a and the inner side surface 42 of the stator core slot 41 are bonded via the fixing member 20a, the stator coil 52a can be firmly fixed.

  In addition, the same effect as the above-mentioned fixing member 20a is obtained also in the fixing member 20b. Further, in the fixing member 20c, the heat generated in the stator coil 52b can be efficiently dissipated to the stator core 40 by the same action as the above-described fixing member 20a, and the stator coil 52b can be dissipated in the stator core. It can be firmly fixed to the bottom surface of the slot 41. Further, in the fixing member 20d, the stator coil 52a and the stator coil 52b can be firmly bonded to each other by the same action as the above-described fixing member 20a. Further, in the fixing member 20e, the heat generated in the stator coil 52a can be efficiently dissipated to the stator core 40 via the wedge 60 by the same action as the above-described fixing member 20a. 52a can be firmly fixed to the wedge 60.

  Further, for fixing the stator coils 15a and 15b, as described above, it is preferable to use the fixing members (fixing members 20c, 20d, and 20e) according to the present invention for the portions that function as spacers. It is also possible to use a material known as a spacer used when fixing the stator coil for the portion functioning as.

  Further, when the filler 22 is cured, the volume is slightly reduced. Here, in order to secure the fixing of the stator coils 15a and 15b in the circumferential direction of the rotating electrical machine 10, between the fixing members 20a and 20b and the inner side surface 42 of the stator core slot 41, or the fixing member 20a, You may insert the insertion board 70 which functions as a part of fixing member between 20b and the stator coils 15a and 15b.

  FIG. 5 is a view showing a cross section of the insertion plate 70. FIG. 6 is a view showing a cross section of the stator core slot 41 in the rotating electrical machine 10 in which the insertion plate 70 and the fixing members 20a, 20b, 20c, 20d, and 20e are installed. FIG. 6 shows a case where the insertion plate 70 is inserted between the fixing members 20 a and 20 b and the inner side surface 42 of the stator core slot 41.

  As shown in FIG. 5, the insertion plate 70 includes a substrate 71 and a surface layer 72 formed by applying the same component material as that of the filler 22 to the surface of the substrate 71.

  The substrate 71 is preferably composed of a plate-like member having a bending elastic modulus of about 10 GPa. Specific examples of the material constituting the substrate 71 include FRP (Fiber Reinforced Plastics). By forming the surface layer 72 made of the same material as the filler 22 described above on the surface of the substrate 71, the heat generated by the stator coils 52a and 52b can be efficiently dissipated to the stator core 40. it can.

  The insertion plate 70 is formed by inserting the fixing members 20a and 20b into the gaps between the side surfaces of the stator coils 52a and 52b and the inner side surface 42 of the stator core slot 41, as described above. It is inserted between the inner surface 42 of the stator core slot 41 or between the fixing members 20a, 20b and the stator coils 15a, 15b (see FIG. 6). Further, in the step of inserting the fixing members 20a, 20b into the gap between the side surfaces of the stator coils 52a, 52b and the inner side surface 42 of the stator core slot 41, the insertion plate 70 is simultaneously inserted into the fixing members 20a, 20b and the stator core. You may insert between the inner surface 42 of the slot 41, or between the fixing members 20a and 20b and the stator coils 15a and 15b. Note that the surface layer 72 of the insertion plate 70 is provided so that one surface of the insertion plate 70 and the inner side surface 42 of the stator core slot 41 or the side surfaces of the stator coils 52a and 52b are brought into close contact with each other without forming an air layer. It is preferable to insert the insertion plate 70 in a state in which is not cured.

  As described above, by inserting the insertion plate 70, the stator coils 15a and 15b can be securely fixed in the circumferential direction of the rotating electrical machine 10 even if the volume of the filler 22 is slightly reduced due to curing. Can do.

  Next, another fixing method of the stator coils 15a and 15b by the fixing members 20a, 20b, 20c, 20d, and 20e will be described with reference to FIGS. 1 and 7A to 7D. FIG. 7A is a view showing a cross section of the stator core slot 41 in a state in which the stator coil 52b, the fixing member 20c, and the exterior member 21 are provided. FIG. 7B is a view showing a cross section of the stator core slot 41 in a state in which the stator coil 52b and the fixing members 20b and 20c are provided. FIG. 7C is a diagram illustrating a cross section of the stator core slot 41 in a state in which the stator coils 52a and 52b, the fixing members 20c, 20b, and 20d and the exterior member 21 are provided. FIG. 7D is a diagram illustrating a cross section of the stator core slot 41 in a state where the stator coils 52a and 52b and the fixing members 20a, 20b, 20c, and 20d are provided.

  First, as shown in FIG. 3, a predetermined amount of filler 22 is filled in a bag-shaped exterior member 21 made of a porous film, and the edges of the exterior member 21 are sealed to fix the members 20c, 20d, and 20e. Form.

  Subsequently, the fixing member 20 c is inserted from the opening of the stator core slot 41, and the fixing member 20 c is installed on the bottom surface of the stator core slot 41. Subsequently, the stator coil 52b is installed on the fixing member 20c (see FIG. 7A). At this time, the stator coil 52 b is installed so that one side surface of the stator coil 52 b is in contact with any one of the inner side surfaces 42 of the stator core slot 41.

  Subsequently, the bag-shaped exterior member 21 made of a porous film for constituting the fixing member 20b is inserted into the gap between the side surface of the stator coil 52b and the inner side surface 42 of the stator core slot 41 (see FIG. 7A). .

  Subsequently, a predetermined amount of filler 22 is injected into the exterior member 21 to form the fixing member 20b (see FIG. 7B). At this time, the filler 22 is injected into the exterior member 21 through a needle-like supply end, for example, from a filler pressurizing and supplying device (not shown) that can supply the filler under pressure.

  Subsequently, the fixing member 20d is installed on the stator coil 52b, and the stator coil 52a is installed on the fixing member 20d (see FIG. 7C). At this time, the stator coil 52 a is installed so that one side surface of the stator coil 52 a is in contact with one of the inner side surfaces 42 of the stator core slot 41. In consideration of conducting heat from the stator coils 52a and 52b to the stator core 40, the stator coil 52a and the stator coil 52b are different from each other in the stator core slot 41 from the viewpoint of heat balance. It is preferable that the stator coil 52a and the stator coil 52b are disposed so as to contact the side surface 42.

  Subsequently, the bag-shaped exterior member 21 made of a porous film for constituting the fixing member 20a is inserted into the gap between the side surface of the stator coil 52a and the inner side surface 42 of the stator core slot 41 (see FIG. 7C). .

  Subsequently, a predetermined amount of filler 22 is injected into the exterior member 21 to form the fixing member 20a (see FIG. 7D). At this time, as in the case of forming the fixing member 20a, the filler 22 is, for example, an exterior member via a needle-like supply end from a filler pressurizing and supplying device (not shown) capable of supplying the filler by pressurizing it. 21 is injected.

  Subsequently, the fixing member 20e is installed on the stator coil 52a, and the wedge 60 is driven into the opening of the stator core slot 41 via the fixing member 20e, and the stator coils 52a and 52b are inserted into the stator core slot 41. The fixing members 20a, 20b, 20c, 20d, and 20e are pressed (see FIG. 1) while being fixed at a predetermined position in the vertical direction, that is, in the radial direction. At this time, a predetermined amount of the inside of each fixing member 20a, 20b, 20c, 20d, 20e from the inside of each fixing member 20a, 20b, 20c, 20d, 20e through the hole of the porous film that is the exterior member 21 The filler 22 exudes. And the filler 22 is hardened and the stator coils 52a and 52b are fixed.

  Here, for example, the fixing member 20a inserted into the gap between the side surface of the stator coil 52a and the inner side surface 42 of the stator core slot 41 will be described as an example. The side surface of the stator coil 52a and one of the fixing member 20a The filler 22 that exudes and hardens between the surface and between the inner surface 42 of the stator core slot 41 and the other surface of the fixing member 20a, so that the filler 22 functions as an adhesive layer. A thin film is formed. That is, between the side surface of the stator coil 52a and one surface of the fixing member 20a, and between the inner side surface 42 of the stator core slot 41 and the other surface of the fixing member 20a, air having low thermal conductivity. No layer is formed, and a thin film of the filler 22 is formed with a substantially uniform thickness. Accordingly, heat conduction from the stator coil 52a to the fixing member 20a and from the fixing member 20a to the stator core 40 can be promoted, and heat generated in the stator coil 52a is efficiently dissipated to the stator core 40. be able to.

  Further, for fixing the stator coils 15a and 15b, as described above, it is preferable to use the fixing members (fixing members 20c, 20d, and 20e) according to the present invention for the portions that function as spacers. It is also possible to use a material known as a spacer used when fixing the stator coil for the portion functioning as.

  Further, similarly to the method of fixing the stator coils 15a and 15b described above, between the fixing members 20a and 20b and the inner surface 42 of the stator core slot 41, or between the fixing members 20a and 20b and the stator coils 15a and 15b, The insertion plate 70 may be inserted between the two. The insertion plate 70 is fixed to the fixing members 20a and 20b and the stator core slot 41 following the above-described step of injecting a predetermined amount of the filler 22 into the exterior member 21 to form the fixing members 20a and 20b. May be inserted between the inner side surface 42 of the first member and the fixing members 20a and 20b and the stator coils 15a and 15b. Further, the insertion plate 70 is formed in the fixing member 20a, 20b and the stator core slot 41 in the step of forming the fixing member 20a, 20b by injecting a predetermined amount of the filler 22 into the exterior member 21 as described above. You may insert between the side surfaces 42 or between the fixing members 20a and 20b and the stator coils 15a and 15b.

  According to the fixing member and the fixing method of the stator coil according to the above-described embodiment, the exterior member 21 constituting the fixing members 20a, 20b, 20c, 20d, and 20e is configured with a porous film having a pore diameter in a predetermined range. Thus, a necessary amount of a part of the filler 22 filled in the exterior member 21 can be oozed out on the surface of the exterior member 21, that is, the surface of the fixing member. Further, a filling that does not have an air layer between the side surfaces of the stator coils 52a, 52b and the inner side surface 42 of the stator core slot 41, which are in contact with the fixing members 20a, 20b, 20c, 20d, 20e. A thin film of material 22 can be formed. Furthermore, this thin film also has a function as an adhesive layer. As a result, the heat generated in the stator coils 52a and 52b can be efficiently dissipated to the stator core 40, and the stator coils 52a and 52b can be firmly fixed in the stator core slot 41 by an easy method. Can be fixed.

  Further, by inserting the insertion plate 70 between the fixing members 20a, 20b and the inner side surface 42 of the stator core slot 41 or between the fixing members 20a, 20b and the stator coils 15a, 15b, the stator core is inserted. The stator coils 52a and 52b can be more firmly fixed in the slot 41.

  Hereinafter, in the fixing member according to the present invention, the exterior member 21 is composed of a porous film having a pore diameter in the range of the present invention, so that a predetermined amount of the filler is exuded and cured on the surface of the fixing member, and fixed. It will be described in Examples 1 to 3 and Comparative Examples 1 to 2 that the child coil can be firmly fixed.

Example 1
In Example 1, the fixing member was produced as follows.
A porous membrane having a plurality of pores having a pore diameter of 0.45 μm, a porosity of 83%, a thickness of 80 μm, and an IPA flow rate of the porous membrane of 30 ml / (min · cm ² ) (Sumitomo Electric Industries) Made). Using this porous membrane, a bag-shaped exterior member having an opening of 50 mm in length, 200 mm in width, and 1 mm in width was formed. From the opening of this exterior member, a filler 22 composed of 100 parts of 828 epoxy resin (manufactured by Japan Epoxy Resin) and 1 part of Curazole C11Z-A (manufactured by Shikoku Kasei Kogyo Co., Ltd.) as an imidazole curing agent Filled with 9.5 ml. The viscosity of this filler was 15 Pa · sec at 23 ° C. In addition, this filler is hardened | cured at 80 degreeC. Subsequently, the opening of the exterior member was adhered and sealed with an epoxy adhesive to produce a fixing member.

  As shown in FIG. 1, the manufactured fixing member includes a bottom surface of the stator core slot, a gap between the side surface of the stator coil and the inner surface of the stator core slot, a space between the stator coil and the stator coil, and a stator. The stator coil was fixed in the stator core slot by being disposed between the coil and the wedge. In this state, after holding for 12 hours, the wedge was removed, and the inside of the stator core slot was observed.

  As a result of observing the inside of the stator core slot, a thin film functioning as an adhesive layer is formed between the respective fixing members and those in contact with the fixing members by hardening the filler oozed from the inside of the fixing members to the surface. Thereby, the stator coil was firmly fixed.

(Example 2)
In Example 2, the porous membrane has a plurality of pores having a pore diameter of 0.2 μm, the porosity is 80%, the thickness is 80 μm, and the IPA flow rate of the porous membrane is 8 ml / (min · cm ² ). The structure is the same as that of the fixing member of Example 1 except that a certain pore flon (manufactured by Sumitomo Electric) is used. And like Example 1, after hold | maintaining for 12 hours, the wedge was removed and the inside of a stator core slot was observed.

  As a result of observing the inside of the stator core slot, the amount of leaching is slightly smaller between each fixing member and the one in contact with the fixing member than in the case of Example 1, but the filler leached from the inside of the fixing member to the surface is hardened. Thus, a thin film functioning as an adhesive layer was formed. Thereby, the stator coil was firmly fixed.

(Example 3)
In Example 3, a porous membrane having a plurality of pores having a pore diameter of 1 μm, a porosity of 86%, a thickness of 100 μm, and an IPA flow rate of the porous membrane of 60 ml / (min · cm ² ). Except for using (manufactured by Sumitomo Electric), the configuration of the fixing member of Example 1 is the same. And like Example 1, after hold | maintaining for 12 hours, the wedge was removed and the inside of a stator core slot was observed.

  As a result of observing the inside of the stator core slot, the amount of leaching is slightly larger between each fixing member and the one in contact with the fixing member than in the case of Example 1, but the filler leached from the inside of the fixing member to the surface is hardened. Thus, a thin film functioning as an adhesive layer was formed. Thereby, the stator coil was firmly fixed.

(Comparative Example 1)
In Comparative Example 1, the porous membrane has a plurality of pores having a pore diameter of 0.1 μm, the porosity is 80%, the thickness is 80 μm, and the IPA flow rate of the porous membrane is 4 ml / (min · cm ² ). The structure is the same as that of the fixing member of Example 1 except that a certain pore flon (manufactured by Sumitomo Electric) is used. And like Example 1, after hold | maintaining for 12 hours, the wedge was removed and the inside of a stator core slot was observed.

  As a result of observing the inside of the stator core slot, the filler did not ooze from the inside of the fixing member to the surface. That is, the filler was cured only in the fixed member. As a result, a thin film functioning as an adhesive layer is not formed between each fixing member and the member in contact therewith, and the stator coil cannot be firmly fixed.

(Comparative Example 2)
In Comparative Example 2, the porous membrane has a plurality of pores having a pore diameter of 5 μm, a porosity of 88%, a thickness of 100 μm, and an IPA flow rate of the porous membrane of 120 ml / (min · cm ² ). Except for using (manufactured by Sumitomo Electric), the configuration of the fixing member of Example 1 is the same. And like Example 1, after hold | maintaining for 12 hours, the wedge was removed and the inside of a stator core slot was observed.

  As a result of observing the inside of the stator core slot, a large amount of filler exuded from the inside of the fixing member to the surface. As a result, the filler flows into another region and hardens, so that the function as a fixing member cannot be exhibited, and the stator coil cannot be firmly fixed.

  Although the present invention has been specifically described above with reference to the embodiments, the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the invention. In addition, the fixing member and the method for fixing the stator coil according to the present invention can be applied to general rotating electrical machines such as an electric motor and a generator.

The figure which shows the cross section of the stator core slot in the rotary electric machine in which the fixing member of one embodiment which concerns on this invention was installed. The perspective view which shows the external appearance of the fixing member of one Embodiment which concerns on this invention. The figure which shows the cross section of the fixing member of one Embodiment which concerns on this invention. The figure which shows the cross section of the stator core slot of a state provided with the stator coil and the fixing member. The figure which shows the cross section of the stator core slot of a state provided with the stator coil and the fixing member. The figure which shows the cross section of an insertion board. The figure which shows the cross section of the stator core slot in the rotary electric machine in which the fixing member was installed. The figure which shows the cross section of the stator core slot 41 of the state provided with the stator coil, the fixing member, and the exterior member. The figure which shows the cross section of the stator core slot of a state provided with the stator coil and the fixing member. The figure which shows the cross section of the stator core slot of the state provided with the stator coil, the fixing member, and the exterior member. The figure which shows the cross section of the stator core slot of a state provided with the stator coil and the fixing member. The figure which shows the cross section of the stator core slot in which the fixing member in the conventional rotary electric machine was installed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 20a, 20b, 20c, 20d, 20e ... Fixing member, 40 ... Stator core, 41 ... Stator core slot, 42 ... Inner side surface, 50 ... Coil conductor, 51 ... Insulating layer, 52a, 52b ... Stator coil, 60 ... wedge.

Claims (10)

A fixing member for fixing a stator coil housed in a stator core slot provided in a stator core of a rotating electric machine,
A bag-shaped exterior member made of a porous film and sealed at the end,
A filler which cures when filled at room temperature or heated to the outer member,
A stator coil fixing member comprising a plate-like insertion plate inserted between the outer member and the stator core slot or between the stator coil and the outer member.   2. The stator coil fixing member according to claim 1, wherein the porous film has a plurality of holes having a hole diameter of 0.2 μm to 4 μm. The IPA (isopropyl alcohol) flow through a porous ^{membrane, 8ml / (min · cm 2} ) ~90ml / claim 1 or 2, wherein the stator coil, characterized in that (min · cm ²⁾ is Fixed member. 4. The stator coil fixing member according to claim 1, wherein the filler is applied to a surface of the insertion plate . 5. A method for fixing a stator coil housed in a stator core slot provided in a stator core of a rotating electrical machine,
A fixing member forming step of filling a bag-shaped exterior member made of a porous film with a predetermined amount of a filler that cures at room temperature or by heating, and sealing the edge of the exterior member to form a fixing member; ,
A fixing member inserting step of inserting the fixing member into at least a gap between a side surface of the stator coil housed in the stator core slot and an inner side surface of the stator core slot;
An insertion plate insertion step of inserting a plate-shaped insertion plate between the fixing member and the stator core slot or between the stator coil and the fixing member;
A stator coil fixing step of fixing a stator coil by driving a wedge into the opening of the stator core slot, causing a part of the filler to ooze out on the surface of the fixing member, and then hardening the wedge;
A stator coil fixing method comprising the steps of: A method for fixing a stator coil housed in a stator core slot provided in a stator core of a rotating electrical machine,
A bag-shaped exterior member made of a porous membrane and sealed at the end side is provided at least in a gap between a side surface of the stator coil housed in the stator core slot and an inner side surface of the stator core slot. An exterior member inserting step to insert;
A fixing member forming step of forming a fixing member by injecting a predetermined amount of a filler that is cured by room temperature or heating into the inserted exterior member;
An insertion plate insertion step of inserting a plate-shaped insertion plate between the fixing member and the stator core slot or between the stator coil and the fixing member;
A stator coil fixing step of fixing a stator coil by driving a wedge into the opening of the stator core slot, causing a part of the filler to ooze out on the surface of the fixing member, and then curing the filler. And a stator coil fixing method. The stator coil fixing method according to claim 5 or 6, wherein the filler is applied to a surface of the insertion plate . The method for fixing a stator coil according to claim 5, wherein the porous film has a plurality of holes having a hole diameter of 0.2 μm to 4 μm . The IPA (isopropyl alcohol) flow through a porous ^{membrane, 8ml / (min · cm 2} ) ~90ml / (min · cm 2) any one of claims 5 to 8, characterized in that it is fixing method of the stator coil according. The stator coil fixing member according to any one of claims 1 to 4, wherein at least a gap between a side surface of the stator coil housed in the stator core slot and an inner side surface of the stator core slot is installed. The rotating electric machine is characterized in that the stator coil is fixed in the stator core slot.

Images