JP2006180611A - Stator coil fixing method of rotating electric machine and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the need for applying pretreatment to a stator coil, to facilitate work for inserting the stator coil into a core slot, to improve heat diffusion in the core slot, and to further effectively exhibit an effect for suppressing electromagnetic vibration. <P>SOLUTION: After covering low-resistance corona preventive layers on the upper face, one side face and the lower face of the stator coil 6 with a semi-conductive stator coil fixing member 10 formed by sealing a liquified filling material 12 that expresses viscoelasticity after being cured into a pouched member 11, the stator coil 6 is inserted into the core slot 3, the liquified filling material in the stator coil fixing member is cured, and the stator coil is tightly fixed to a core slot sidewall. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for fixing a stator coil of a rotary electric machine, particularly a large rotary electric machine such as a turbine generator or a turbine generator, and a rotary electric machine having a stator to which a stator coil is fixed by the same method.

  In general, in large rotating electrical machines such as turbine generators and turbine generators, the electromagnetic action between the current flowing in the stator coil and the leakage magnetic flux that crosses the core slot and interlinks with the stator coil itself among the magnetic flux generated by the current. Prevents the stator coil from vibrating in the radial direction due to the electromagnetic force generated in the coil, and prevents partial discharge from occurring in the core slot due to the disappearance of wear of the low-resistance corona prevention layer applied to the stator coil surface. For the purpose, a semiconductive corrugated laminate is driven between the side surface of the stator coil and the side wall of the iron core slot to fix the stator coil (see, for example, Patent Document 1).

The technique described in Patent Document 1 will be described with reference to FIG.
In FIG. 10, reference numeral 1 denotes a stator of a rotating electric machine, and two stator coils are inserted into an iron core slot 3 that opens along the inner periphery of the stator core 2 via a coil bottom spacer 4 and an inter-coil spacer 5. 6 is stored. Here, although the stator coil 6 is comprised from the upper coil 6a and the lower coil 6b, when it is not necessary to distinguish and explain as an upper coil and a lower coil, it demonstrates only as the stator coil 6. FIG.

  A lower wedge spacer 7 is disposed above the upper coil 6 a, and a wedge 8 is firmly driven into the opening of the iron core slot above the lower wedge spacer 7 to support and fix the stator coil 6 in the iron core slot 3. Since an electromagnetic force having a frequency twice the power supply frequency is generated in the stator coil 6 due to the current flowing through the conductor and the slot leakage magnetic flux generated by this current, one side surface of the stator coil 6 and the side wall of the iron core slot 3 are generated. Between them, the stator coil 6 is pressed against the other side wall of the iron core slot 3 by using the semiconductive corrugated laminate 9 and the spring force of the corrugated laminate 9 and the frictional force of the pressure contact surface are utilized. Thus, radial vibration is suppressed, thereby preventing occurrence of slot discharge between the stator coil and the stator core.

  However, in the method of fixing the stator coil by driving the corrugated laminated plate 9 between the one side surface of the stator coil 6 and the side wall of the iron core slot 3 in this way, skilled skills based on many years of experience are required. Moreover, there is a drawback that it takes a long time to work. Further, since the corrugated laminate 9 forms an air layer having poor thermal conductivity between the stator coil 6 and the core slot 3 wall, heat dissipation in the core slot 3 is deteriorated, and the temperature of the stator coil is raised. To do. If the rotating electrical machine is operated for a long period of time while the stator coil 6 is at a high temperature, the familiarity of the stator coil 6 and the organic materials such as the wedge 8 and the corrugated laminate 9 will be withered. When the wedge 8 and the corrugated laminate 9 are withered, the spring force is weakened and the effect of suppressing electromagnetic vibration is reduced. As a result, a low resistance corona prevention layer (not shown) formed on the surface of the stator coil 6 is shown. However, the wear disappears due to vibration, and slot discharge occurs between the stator coil 6 and the stator core 2, which may cause deterioration of insulation characteristics due to damage of the stator coil 6.

  In addition, one of the inventors of the present application has invented Patent Document 2 described below as one of the measures for eliminating the drawbacks of the method of driving the corrugated laminate and fixing the stator coil. Patent Document 2 discloses two embodiments roughly divided.

  First, in the first embodiment, the stator coil is covered with a tubular member made of a semiconductive rubber-like elastic body, and one end thereof is bound and sealed with a string-like body such as a glass cord, and the stator is placed in an iron core slot. After the coil is placed and the wedge is driven, a semiconductive epoxy resin is injected between the stator coil and the tube-shaped member, and the resin is cured to be firmly supported and fixed in the iron core slot.

  Moreover, the modification of 1st Embodiment is the hole (single hole or double hole structure) formed along the axial direction in the thick part of the tubular member located in the side surface of the stator coil which touches the inner wall of the core slot. A semiconductive epoxy resin is injected, the resin is cured, and is firmly supported and fixed in the iron core slot.

Further, in the second embodiment, the coil is covered with a sleeve-like member made of a thick semiconductive elastic body (silicone rubber is filled with carbon) in which the stator coil is larger than the inner dimension of the core slot. After the child coil is press-fitted into the core slot, a wedge is driven to firmly support and fix the stator coil in the core slot without a gap.
Japanese Patent Laid-Open No. 2003-304662 Japanese Patent Laid-Open No. 10-014183

However, the first embodiment disclosed in Patent Document 2 and its modification have the following problems to be improved. That is,
(1) Since the gap between the iron core slot and the stator coil is as narrow as several millimeters, it is necessary to make the thickness of the tubular member quite thin. On the other hand, a stator coil used in a turbine generator or the like has a total length of several meters including the coil side (straight line portion: the portion accommodated in the core slot) and the coil end portion (curved portion). Since the cross-sectional dimension of the end of the stator coil is larger than the cross-sectional dimension of the straight line part in manufacturing and the accuracy of the dimension is not good, the operation of covering the stator member with the tubular member is considerably difficult and takes a long time. Also, after covering the stator coil with a tube-shaped member, one end must be tied and sealed with a string-like body such as a glass cord in order to inject conductive epoxy resin, and fixed in the core slot It takes a long time for the pretreatment before inserting the child coil.

  (2) As described in (1) above, the thickness of the tube-like member is quite thin, so that it may be damaged at the corners of the core when inserted into the core slot. If the tube-like member is damaged, it will leak when the semiconductive epoxy resin is injected, and the gap between the stator coil and the slot cannot be filled.

(3) Also, since the tubular member is in close contact with the stator coil, a device for injecting under pressure is required when injecting the semiconductive epoxy resin.
(4) When a room temperature curing type semiconductive epoxy resin that is easy to work is used, when the actual machine operating temperature is higher than the design value, the resin may deteriorate during long-term operation and the fixing force may be reduced. On the other hand, when a thermosetting semiconductive epoxy resin is used, the number of man-hours for assembling the stator coil is increased in the factory, and there is no heating device at the site (power plant), and thus it cannot be manufactured.

The second embodiment has the following points to be improved. That is,
(5) Since the coil is covered with a sleeve-like member having a wall thickness larger than the inner dimension of the core slot, it takes a long time for pretreatment as in the above (1), and the sleeve-like member is not inserted when inserted into the core slot. Since it is an elastic body that is particularly vulnerable to tearing, it may be damaged at the corners of the iron core.

(6) When the stator coil is inserted into the core slot, the stator coil width is larger than the internal dimension of the core slot, so that it is quite difficult to manually insert an insertion device.
As described above, the invention disclosed in Patent Document 2 still has many problems to be improved before practical use.

  The present invention has been made in view of the above-described problems of the prior art, and it is not necessary to perform a pretreatment on the stator coil, and it is easy to insert the stator coil into the core slot. The present invention provides a stator coil fixing method for a rotating electrical machine that can exhibit the effect of suppressing electromagnetic vibration more effectively and a rotating electrical machine having a stator to which a stator coil is fixed by the same method. Objective.

  In order to achieve the above object, the invention according to claim 1 is a method of fixing a stator coil housed in an iron core slot provided in a stator core of a rotating electrical machine. And the three surfaces of the lower surface are covered with a semiconductive stator coil fixing member encapsulating a liquid filler that develops viscoelasticity after curing, and integrated with the stator coil, and then the stator coil is The gap between the stator coil and the core slot side wall is filled with the stator coil fixing member by inserting into the slot and then driving a wedge into the opening of the iron core slot to press and deform the stator coil fixing member. At the same time, the stator coil is brought into close contact with the opposite side wall of the core slot, and then the liquid filler is cured to fix the stator coil in the core slot. The features.

  According to a fourth aspect of the present invention, there is provided a method for fixing a stator coil housed in a core slot provided in a stator core of a rotating electrical machine, wherein the semiconductive laminated member having a cross section curved in an arc shape is used. A semiconductive material having deformability and high tension is integrally provided on the inner arc surface side, and the dimension of the central part becomes larger than the dimension obtained by subtracting the stator coil width dimension from the internal dimension of the core slot. The semiconductive stator coil fixing member formed as described above is pasted and arranged on one side wall of the core slot, and then the stator coil is inserted, and then the stator coil fixing member is pressed from the opening side of the core slot Thus, the stator coil is closely fixed to the opposite side wall of the core slot by being deformed.

  Further, according to a seventh aspect of the present invention, there is provided a method for fixing a stator coil housed in a core slot provided in a stator core of a rotating electrical machine, wherein an elongated flat cylindrical semiconductive housing member having an opening on one side. Inside, a semiconductive stator coil fixing member containing a gelled mat member is formed so that the thickness is smaller than the dimension obtained by subtracting the stator coil width dimension from the internal dimension of the core slot. Then, the stator coil is inserted into the core slot, and then the liquid filler is introduced into the semiconductive housing member and gelled and expanded, so that the stator coil is closely fixed to the side wall of the core slot.

  According to the present invention, it is not necessary to perform a pretreatment on the stator coil before insertion into the core slot, the stator coil insertion work into the core slot is easy, and the fixing force is maintained even when used for a long time. A stator coil fixing method for a rotating electrical machine that can effectively suppress electromagnetic vibration without lowering, and a rotating electrical machine having a stator coil fixed by the same method can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which is common throughout each figure, and description is abbreviate | omitted suitably about the overlapping part.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5.

  1 is a cross-sectional view showing a state in which a stator coil of a rotating electrical machine according to the first embodiment is incorporated in an iron core slot, and FIG. 2 is a cross-sectional view of a stator coil fixing member employed in the first embodiment. Is a cross-sectional view showing a state where the stator coil fixing member is attached to the stator coil, FIG. 4 is a cross-sectional view showing a final fixed state of the stator coil, and FIG. 5 is a cross-sectional view showing another example of the stator coil fixing member FIG.

  In the first embodiment, instead of the conventional corrugated laminated plate 9, three surfaces of the surface of the stator coil 6 provided with the low resistance corona prevention layer, that is, a total of three surfaces, that is, one side surface and its upper and lower surfaces are fixed. The coil is integrally covered and pasted by the child coil fixing member 10, and the other configuration is the same as in the case of FIG.

  1 to 4, the stator coil fixing member 10 has a length substantially equal to the dimension of the linear portion of the stator coil 6 (the portion accommodated in the iron core slot 3), and the stator coil 6. A deformable bag-shaped member 11 having a width equivalent to the total dimension (2W1 + W2) of three surfaces including one side surface of the coil, that is, the coil one-side surface, the coil upper surface and the coil lower surface, and the bag-shaped member 11 The liquid filler 12 that is sealed in a liquid-tight manner and develops viscoelasticity after curing, and the width (W1) of the stator coil 6 is substantially equal to the upper and lower edges of the bag-like member 11 in the width direction. It is comprised from the member 13 for adhesion apply | coated to the width | variety.

  The thickness of the stator fixing member 10 is a dimension obtained by subtracting the width dimension (W1) of the stator coil 6 from the internal dimension (W3) of the iron core slot 3 with the liquid filler 12 sealed in the bag-shaped member 11. The thickness (W5) is smaller than W4 (W4 = W3-W1) (W4> W5).

By the way, the material of the bag-like member 11 is a semiconductive polyester obtained by impregnating and curing one of a highly heat-resistant epoxy resin, unsaturated polyester resin, and polyimide resin composition containing carbon particles. One of woven or non-woven sheet material made of fiber, polypropylene fiber, polyamide fiber, glass fiber or the like is suitable. In the examples, a non-woven sheet material comprising a polyethylene terephthalate fiber having a thickness of about 0.085 mm, in which carbon particles are blended so as to have a surface resistivity of about 10 ² to 10 ³ Ω in an unsaturated polyester resin having high heat resistance. (For example, 215.51 manufactured by Isola) was molded into a bag shape.

On the other hand, as the material of the liquid filler 12, a silicone gel or viscoelasticity that develops after curing, or a silicone gel containing carbon particles and a highly thermally conductive inorganic filler such as magnesium oxide or boron nitride is suitable. . In the examples, carbon particles are blended into a silicone gel (for example, GE Toshiba Silicone TSE3070) to adjust the surface resistivity to about 10 ² to 10 ³ Ω, and a high thermal conductive inorganic filler (for example, , LA2000 or LA4000 alumina powder manufactured by Taiheiyo Random Co., Ltd.) was used. The liquid filler in this example is cured at room temperature. The liquid filler 12 can be adjusted for elongation by blending the inorganic filler. Moreover, the member 13 for adhesion | attachment is a hook loop fastener made from Sumitomo 3M, for example.

  Next, a method of fixing the stator coil 6 in the iron core slot 3 using the stator coil fixing member 10 having the above configuration will be described in the order of steps.

  (1) First, after adjusting the attachment position by applying an intermediate portion where the adhesive member 13 of the bag-like member 11 is not applied to one side surface of the stator coil 6 having a low-resistance corona prevention layer on the surface, The bag-shaped member 11 is bonded to the upper surface and the lower surface of the stator coil 6 by the adhesive members 13 applied to the upper edge portion and the lower edge portion, respectively. As a result, the stator coil fixing member 10 is integrated with the stator coil 6 in close contact with the upper surface of the stator coil 6, the three surfaces including the one side surface contacting the side wall of the iron core slot 3 and the lower surface. In this integrated state, the total dimension (W1 + W4) of the cross-sectional outer thickness (W4) of the bag-like member 11 and the width dimension (W1) of the stator coil 6 is the internal method of the core slot 3. Slightly smaller than the dimension (W3) (W1 + W4 <W3).

  (2) Next, the stator coil 6 including the upper coil 6a and the lower coil 6b with the inter-coil spacer 5 interposed therebetween is inserted from the opening of the iron core slot 3 in which the coil bottom spacer 4 has been disposed. In this inserted state of the stator coil 6, the liquid filler 11 in the bag-like member 11 is still uncured and has fluidity, so that the amount other than the amount corresponding to the gap between the side wall of the core slot 3 and the stator coil 6. Is stored in a bag-like member 11 located on the lower surface of the stator coil 6. This state is shown in FIG.

(3) Next, the lower wedge spacer 7 is disposed on the upper coil 6 a, and the wedge 8 is firmly driven into the core slot opening at the upper portion of the lower wedge spacer 7. By driving the wedge 8 into the core slot opening, the stator coil 6 and the stator coil fixing member 10 are strongly pressed toward the bottom of the core slot, so that the bag-like member 11 on the lower surface of the stator coil 6 is thinly deformed. Then, the liquid filler 12 stored therein is moved to the side of the stator coil 6 in the bag-like member 11.
When the liquid filler 12 moves to the side of the stator coil 6, the width of the bag-like member 11 swells on the side of the stator coil 6, and as a result, the air around the bag-like member 11 flows into the core slot 3. At the same time, the opposite side surface of the fixed coil 6 that is not covered with the bag-like member 11 is strongly adhered to the side wall of the core slot 3.

  (4) Thereafter, the liquid filler 12 in the bag-like member 11 is cured at room temperature to develop elasticity in the liquid filler 12, and the stator coil 6 is fixed by the stator coil fixing member 10 having elasticity.

According to the stator coil fixing method of the first embodiment described above, the following effects can be obtained. That is,
(1) Since the bag-like member 11 of the stator coil fixing member 10 only needs to be adhered and covered on the three surfaces including the one side surface of the stator coil, the coil upper surface, and the coil lower surface, the stator coil 6 has a conventional structure. In addition, no time is required for the pretreatment before inserting the core slot.

  (2) Since the bag-shaped member 11 encloses the liquid filler 12 that develops viscoelasticity after curing, when inserting the stator coil 6 into the core slot 3, the top surface of the stator coil 6 or When the liquid filler 12 moves to the lower surface or both, and a wedge is driven into the slot opening and pressed against the inner bottom of the iron core slot 3, it moves to the side of the coil, thereby simplifying the insertion operation.

  (3) Since the width of the fixing member 10 is not larger than the inner dimension of the core slot 3 even if the fixing member 10 is integrally bonded to the stator coil 6, when the stator coil 6 is inserted into the core slot 3, a bag shape is obtained. The member 11 is not damaged.

  Moreover, in the rotating electrical machine having the stator coil fixed by the above fixing method, the following effects can be obtained.

  (1) Air between the stator coil 6 and the core slot 3 side wall and between the core slot 3 side wall, the stator coil fixing member 10 and the stator coil 6 side wall is eliminated, and the stator coil fixing member 10 conducts high heat. Since it is comprised with a property material, the heat which generate | occur | produced in the stator coil conductor can be efficiently transmitted to the stator core 2, and can be radiated, and the temperature rise of a stator coil can be suppressed.

  (2) Since the liquid filler 11 in the fixing member 10 exhibits viscoelasticity after curing and has a large elongation (elongation can be adjusted by blending the inorganic filler), it can absorb electromagnetic vibration during operation and can be extended by temperature. Therefore, the fixing force does not decrease during operation. Therefore, even if the rotary electric machine is operated for a long period of time, the low resistance corona prevention layer applied to the surface of the stator coil 6 does not disappear and disappears due to slot discharge between the stator coil 6 and the stator core 2. There is no risk of damage to the stator coil 6 and deterioration of the insulation characteristics.

(Modification)
In the example of the stator coil fixing member 10 shown in FIG. 2, the range in which the liquid filler 12 is enclosed is formed in the remaining range excluding the coil width (W1) from one end in the width direction. 1 is not limited to this, and as in the stator coil fixing member 10A in FIG. 5, the entire range in the width direction, that is, the entire portion in contact with the three surfaces of the upper surface, the lower surface and the one side surface of the stator coil 6 is used. You may comprise so that it may enclose. In the case of the stator coil fixing member 10A of FIG. 5, it goes without saying that the same operational effects as in the case of FIG.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is a cross-sectional view showing a state in which the stator coil of the rotating electrical machine according to the second embodiment is incorporated in an iron core slot, and FIG. 7 is a cross-sectional view of the stator coil fixing member employed in the second embodiment.

  In the second embodiment, the stator coil fixing member 10B shown in FIG. 7 is used instead of the stator coil fixing member 10 employed in the first embodiment, and the stator coil 6 is fixed in the iron core slot 3. Is.

  The stator coil fixing member 10B used in the second embodiment has a length substantially the same as the linear portion of the stator coil, and is formed to be curved so that a cross section in the width direction draws an arc (a crescent moon). The semiconductive laminate member 14 and the semiconductive material 15 having both deformability and high tension are provided integrally with the inner arc surface (concave surface) formed on the semiconductive laminate member 14. is there. In addition, the stator coil fixing member 10B has a width dimension (W6) slightly smaller than the dimension obtained by subtracting the width dimension (W1) of the stator coil 6 from the internal dimension (W3) of the core slot 3. It is formed so as to increase (W6> W3-W1).

  By the way, as the semiconductive laminated member 14, alumina or glass fiber woven fabric impregnated with one of a highly heat-resistant epoxy resin, unsaturated polyester resin, and polyimide resin composition containing carbon particles. A material formed by laminating a plurality of cloths is suitable.

In Examples, a thermosetting epoxy resin composition (for example, DEN438, Epicoat 1001, and BF3-400 manufactured by Hashimoto Kasei Co., Ltd.) in which carbon particles are blended so that the surface resistivity is about 10 ² to 10 ³ Ω is used. After a plurality of semi-cured sheet materials impregnated into a glass fiber woven fabric (for example, WE26-104 manufactured by Nitto Boseki Co., Ltd.) are laminated by heating and pressure molding, the inner dimension of the core slot 3 at the center ( The semiconductive material 15 was poured in an arcuate shape so as to be larger than the dimension obtained by subtracting the width dimension (W1) of the stator coil 6 from W3), and the adhesive was cured and integrated.

  On the other hand, as the semiconductive material 15, a material having deformability and high tension made of a silicone gel in which carbon particles and an inorganic filler with high thermal conductivity such as magnesium oxide and boron nitride are blended is suitable.

In the examples, carbon particles are blended into a silicone gel (for example, TSE3070 manufactured by GE Toshiba Silicone) to adjust the surface resistivity to about 10 ² to 10 ³ Ω, and further, a highly heat-conductive inorganic filler (for example, , LA2000 or LA4000 alumina powder manufactured by Taiheiyo Random Co., Ltd.) was used.

  Next, a method of fixing the stator coil 6 in the core slot 3 using the stator coil fixing member 10B configured as described above will be described in the order of steps.

  (1) First, an adhesive is applied to the surface of the semiconductive material 15 of the stator coil fixing member 10B, and is adhered to one side wall of the iron core slot 3, and this state is maintained.

  (2) Next, after the coil bottom spacer 3 is disposed at the bottom of the iron core slot 3, the inter-coil spacer 5 is sandwiched between the upper coil 6a and the lower coil 6b having a low resistance corona prevention layer on the surface. The stator coil 6 is inserted from the opening of the iron core slot 3. In this case, the thickness (W6) of the central portion in the width direction of the stator coil fixing member 10B is slightly thicker than the dimension obtained by subtracting the stator coil width (W1) from the core slot internal dimension (W3). 6 can be inserted by strongly pressing from the opening side of the core slot. In this state, the semiconductive laminated member 14 of the stator coil fixing member 10B is slightly warped in the width direction, and accordingly, the semiconductive material 15 is deformed to be expanded.

  (3) Next, the lower wedge spacer 7 is disposed on the upper coil 6 a, and the wedge 8 is firmly driven into the core slot opening at the upper portion of the lower wedge spacer 7. By firmly driving the wedge 8 into the core slot opening, the stator coil fixing member 10B deforms and expands in the width direction. As a result, between the core slot 3 side wall, the stator coil fixing member 10B and the stator coil 6 side wall. Even in the absence of an air layer, it adheres. At the same time, the opposite side surface of the fixed coil 6 is firmly attached to the side wall of the iron core slot 3 by the stator coil fixing member 10B. The stator coil 6 is firmly and firmly fixed to the side wall of the iron core slot 3.

  In the above-described process, the stator coil fixing member 10B is arranged on the side wall of the iron core slot 3, and then the coil bottom spacer 3 is arranged on the bottom of the iron core slot 3, but conversely, on the bottom of the iron core slot 3. After the coil bottom spacer 3 is arranged, the stator coil fixing member 10B may be arranged on the side wall of the iron core slot 3.

According to the stator coil fixing method of the second embodiment described above, the following effects can be obtained. That is,
(1) The semiconductive laminated member 14 bent in an arc shape, and the semiconductive material 15 having deformability and high tension are bonded and cured on the concave surface of the semiconductive laminated member 14 to have a good thermal conductivity. Since the stator coil 6 is inserted from the opening of the core slot in a state where the stator coil fixing member 10B is attached to one side wall of the core slot 3, the stator coil 6 is inserted as in the embodiment described in Patent Document 2 described above. The pretreatment before inserting the stator coil 1 into the core slot 3 does not take time.

  (2) Since the semiconductive material 15 provided integrally with the semiconductive laminated member 14 of the stator coil fixing member 10B has deformability and high tension, the stator coil 6 can be easily placed in the core slot 3. Can be inserted into.

Moreover, in the rotating electrical machine having the stator coil fixed by the above fixing method, the same effects as those of the first embodiment can be obtained. That is,
During the insertion of the stator coil, the semiconductive material 15 made of silicone gel having deformability and high tension is spread to fill the gap formed between the side wall of the core slot and the stator coil. It is possible to localize the formation of an air layer with poor thermal conductivity between the three side walls, the iron core slot 3 side walls, the stator coil fixing member 10B, and the stator coil 6 side walls, and efficiently generate heat generated in the stator coil conductor. It can be transferred to the stator core and dissipated. As a result, even if the rotating electrical machine is operated for a long period of time, the stator coil fixing member 10B maintains elasticity and effectively suppresses the electromagnetic vibration of the stator coil and is applied to the surface of the stator coil 6. The loss of wear of the low-resistance corona prevention layer is prevented, and there is no possibility that the stator coil 6 is damaged by the slot discharge between the stator coil 6 and the stator core 2 and the insulation characteristics are not lowered.

(Embodiment 3)
Embodiment 3 of the present invention will be described with reference to FIGS. 8 and 9.
FIG. 8 is a cross-sectional view showing a state in which the stator coil of the rotating electrical machine according to the third embodiment is incorporated in an iron core slot, and FIG. 9 is a cross-sectional view of the stator coil fixing member employed in the third embodiment.

  In Embodiment 3 of the present invention, the stator coil 6 is fixed in the core slot 3 by using the stator coil fixing member 10C shown in FIG. 9 instead of the stator coil fixing member 10 employed in Embodiment 1. It is a thing.

  The stator coil fixing member 10C employed in the third embodiment has a length that is substantially the same as the side of the stator coil, and is an elongated flat tube in which one end of the length direction is closed and the other is opened. A gelled mat member 17 is inserted into a semiconductive housing member 16 and the gelated mat member 13 is gelled after the stator coil is stored. Moreover, the thickness (W7) of the stator coil fixing member 10C is slightly larger than the dimension (W3-W1) obtained by subtracting the width dimension (W1) of the stator coil 6 from the internal dimension (W3) of the iron core slot 3. It is formed to be thin.

  Here, as the elongated flat cylindrical semiconductive storage member 16, one of a highly heat-resistant epoxy resin, unsaturated polyester resin, and polyimide resin composition containing carbon particles is impregnated and cured. It is appropriate to form an elongated flat tube using one of a woven fabric or a nonwoven fabric sheet material made of semiconductive polyester fiber, polypropylene fiber, polyamide fiber, glass fiber or the like.

In the examples, carbon powder is blended with heat-curable silicone rubber (for example, TSE3431-H manufactured by GE Toshiba Silicone), impregnated into a non-woven sheet material made of polyethylene terephthalate fiber having a thickness of 0.1 mm, and cured. After the surface resistivity was adjusted to about 10 ² to 10 ³ Ω, it was formed into an elongated flat cylindrical shape having an opening at one end.

  Then, after inserting the mat material 13 (for example, Alpha Gel 1000 manufactured by Alpha Japan Co., Ltd.) filled with the powdered oil gelling agent inserted into the semiconductive housing member 16, the room temperature curable silicone rubber is inserted. (For example, TSE382 manufactured by GE Toshiba Silicone Co., Ltd.) was used to spot-fix to one side of the stator coil 6 contacting the side wall of the iron core slot 3. Note that high heat-resistant silicone oil was used as the liquid filler.

  Next, a method for fixing the stator coil 6 in the iron core slot 3 using the stator coil fixing member 10C will be described in the order of steps.

  (1) First, the stator coil fixing member 10C formed to have a thickness slightly smaller than the dimension obtained by subtracting the width dimension (W1) of the stator coil 6 from the internal dimension (W3) of the core slot 3 It arrange | positions so that it may affix on one side wall (FIG. 8 right side surface).

  (2) Next, after the coil bottom spacer 3 is disposed at the bottom of the iron core slot 3, the inter-coil spacer 5 is sandwiched between the upper coil 6a and the lower coil 6b having a low resistance corona prevention layer on the surface. The stator coil 6 is inserted from the opening of the iron core slot 3.

  (3) Next, the lower wedge spacer 7 is disposed on the upper coil 6a, and the wedge 8 is firmly driven into the upper core slot opening of the lower wedge spacer 7 so that the stator coil 6 is inserted into the core slot. 3 is tightly fixed to the side wall.

  (4) In this state, a liquid filler is injected into the inside from the opening of the semiconductive storage member 16 and sealed. Thereafter, the gelled filler gels and expands, and the stator coil 6 is firmly and firmly fixed to the side wall of the core slot 3.

According to the stator coil fixing method of the third embodiment described above, the following effects can be obtained. That is,
After the semiconductive storage member inserted with the mat material filled with the powder oil gelling agent is placed in the iron core slot, the heat resistant silicone oil of the liquid filler is converted into the powder oil gel of the semiconductive storage member. Since it is injected into the mat material filled with the agent and gelled and expanded, the stator coil can be inserted into the core slot relatively easily without the need for skilled experience and long work.

  Further, in the rotating electric machine having the stator coil fixed by the fixing method described above, the insertion side of the stator coil fixing member 10C where the stator coil 6 and the core slot 3 side wall are not in direct contact is fixed to the core slot side wall. Since the gelled mat material with good thermal conductivity that gelled and expanded fills the gap generated between the child coils, the formation of an air layer with poor thermal conductivity between the stator coil and the core slot side wall can be localized and fixed. Heat generated in the child coil conductor can be efficiently transmitted to the stator core and radiated.

  As a result, similarly to the first embodiment, even if the rotating electrical machine is operated for a long period of time, the stator coil fixing member 10 </ b> C maintains elasticity and effectively suppresses the electromagnetic vibration of the stator coil 6, thereby suppressing the stator coil 6. The loss of wear of the low-resistance corona prevention layer provided on the surface is prevented, and there is no possibility of causing damage to the stator coil 6 due to slot discharge between the stator coil 6 and the stator core 2 and deterioration of insulation characteristics.

Sectional drawing which shows the state which assembled the stator coil of the rotary electric machine in Embodiment 1 of this invention in an iron core slot. Sectional drawing of the stator coil fixing member employ | adopted in Embodiment 1. FIG. Sectional drawing which shows the state which attached the stator coil fixing member to the stator coil. Sectional drawing which shows the final fixed state of a stator coil. Sectional drawing which shows the other example of a stator coil fixing member. Sectional drawing which shows the state which integrated the stator coil of the rotary electric machine in Embodiment 2 of this invention in an iron core slot. Sectional drawing of the stator coil fixing member employ | adopted in Embodiment 2. FIG. Sectional drawing which shows the state which integrated the stator coil of the rotary electric machine in Embodiment 3 of this invention in an iron core slot. Sectional drawing of the stator coil fixing member employ | adopted in Embodiment 3. FIG. Sectional drawing which shows the state which integrated the stator coil of the rotary electric machine by a prior art into an iron core slot.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 2 ... Stator iron core, 3 ... Iron core slot, 4 ... Coil bottom spacer, 5 ... Inter-coil spacer, 6 ... Stator coil, 7 ... Under wedge spacer, 8 ... Wedge 10, 10A, 10B, 10C ... Stator coil fixing member, 11 ... Semiconductive laminated member, 12 ... Liquid filler, 13 ... Adhesive member, 14 ... Semiconductive material, 15 ... Semiconductive material, 16 ... Semiconductive storage member, 17 ... Gelled mat material.

Claims (10)

In a fixing method of a stator coil housed in an iron core slot provided in a stator iron core of a rotating electric machine,
The upper surface, one side surface, and the lower surface of the stator coil are covered with a semiconductive stator coil fixing member enclosing a liquid filler that develops viscoelasticity after curing, and integrated with the stator coil. Thereafter, the stator coil is inserted into the core slot, and then a wedge is driven into the opening of the core slot and the stator coil fixing member is pressed and deformed, whereby the stator coil and the core slot side wall are deformed. The gap is filled with a stator coil fixing member, the stator coil is brought into close contact with the opposite side wall of the core slot, and then the liquid filler is cured to fix the stator coil in the core slot. A stator coil fixing method for a rotating electrical machine.   2. The rotating electric machine fixing according to claim 1, wherein the liquid filler is made of silicone gel or carbon particles and a silicone gel in which an inorganic filler having high thermal conductivity such as magnesium oxide or boron nitride is blended. Child coil fixing method.   The stator coil fixing member is made of a semiconductive polyester fiber made by impregnating and curing one of a highly heat-resistant epoxy resin, unsaturated polyester resin, and polyimide resin composition containing carbon particles, and polypropylene. A deformable bag-shaped member is formed using one of a woven fabric or a non-woven fabric sheet material made of fiber, polyamide fiber, glass fiber, etc., and the thickness of the stator coil fixing member is determined from the inner dimension of the core slot. 2. The stator coil fixing method for a rotating electrical machine according to claim 1, wherein the liquid filler is enclosed in the bag-like member so as not to be larger than a dimension obtained by subtracting the stator coil width dimension. In a fixing method of a stator coil housed in an iron core slot provided in a stator iron core of a rotating electric machine,
A semiconductive material having deformability and high tension is integrally provided on the inner arc surface side of the semiconductive laminated member formed with a cross-section curved in an arc shape, and the dimension of the central portion is the inner slot method. A semiconductive stator coil fixing member formed so as to be larger than a dimension obtained by subtracting the stator coil width dimension from the dimension is pasted and arranged on one side wall of the core slot, and then the stator coil is inserted. Then, the stator coil fixing member is pressed and deformed from the opening side of the iron core slot to deform the stator coil in close contact with the opposite side wall of the iron core slot. Fixing method.   5. The stator coil fixing method for a rotating electrical machine according to claim 4, wherein the semiconductive material is made of a silicone gel containing carbon particles and an inorganic filler having high thermal conductivity such as magnesium oxide or boron nitride. .   The semiconductive laminated member includes a plurality of alumina or glass fiber woven fabrics impregnated with one of a highly heat-resistant epoxy resin, unsaturated polyester resin, and polyimide resin composition containing carbon particles. The stator coil fixing method for a rotating electric machine according to claim 4, wherein the sheets are laminated. In a fixing method of a stator coil housed in an iron core slot provided in a stator iron core of a rotating electric machine,
A semiconductive stator coil fixing member containing a gelled mat member is placed in an elongated flat cylindrical semiconductive storage member having an opening on one side, and the stator coil width is determined from the inner dimensions of the core slot. The stator coil is formed so as to have a thickness smaller than the dimension obtained by subtracting the dimensions, and is inserted into the core slot, and then a liquid filler is allowed to flow into the semiconductive housing member and gelled and expanded. Is fixed to the side wall of the iron core slot in close contact with the stator coil.   The semiconductive housing member is a semiconductive polyester fiber formed by impregnating and curing one of a highly heat-resistant epoxy resin, unsaturated polyester resin, and polyimide resin composition containing carbon particles, and polypropylene. A mat filled with a powdered oil gelling agent after being formed into an elongated flat tube with one side closed using one of woven fabric or nonwoven fabric sheet material made of fiber, polyamide fiber, glass fiber, etc. 8. A stator coil fixing method for a rotating electric machine according to claim 7, wherein a material is inserted.   8. The stator coil fixing method for a rotating electric machine according to claim 7, wherein high heat-resistant silicone oil is used as the liquid filler. A rotating electrical machine having a stator to which a stator coil is fixed by the stator coil fixing method according to any one of claims 1 to 9.

Images