JP2016127776A - Stator for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a rotary electric machine capable of reducing electromagnetic vibrations that may generate great displacement in a radial direction, by improving rigidity of a distal end of a coil end part with respect to vibrations in the radial direction.SOLUTION: A stator for a rotary electric machine comprises a stator core, a plurality of slots, a lower coil, an upper coil and a connection conductor. A distal end position of a coil end part in the lower coil and a distal end position of a coil end part in the upper coil are disposed while being displaced in a circumferential direction. Further, out of two slots which are neighboring to each other in the circumferential direction, the coil end part of the lower coil accommodated in one slot and the coil end part of the upper coil accommodated in the other slot are coupled by an insulative block spacer.SELECTED DRAWING: Figure 3

Description

  Embodiments described herein relate generally to a stator of a rotating electrical machine.

  A stator coil used in, for example, a turbine generator that is a large-capacity rotating electric machine is configured by arranging a lower coil and an upper coil in two layers in a slot provided in a stator core made of laminated steel sheets. Has been. The upper coil and the lower coil housed in the slot are connected in series (series connection) at the tip of the coil end portion that protrudes in the axial direction from the end face of the stator core.

  Here, the upper coil and the lower coil have high rigidity because they are housed in the slots inside the stator core, but the coil end portion that protrudes in the axial direction from the stator core has a cantilever structure. Therefore, the rigidity is low. For this reason, in the coil end part, it is necessary to take measures against circular vibration caused by electromagnetic force.

  As a result of investigating the deformation mode of the ring vibration mode, the radial displacement of the ring vibration generated in the coil end portion becomes very large at the tip far from the end face as compared to the position near the end face of the stator core. I understood that. However, with the conventional measures, there is a possibility that the radial rigidity at the tip of the coil end portion is not sufficiently ensured.

Japanese Patent Laid-Open No. 4-217836 JP 2010-226901 A

  The problem to be solved by the present invention is to improve the rigidity against the radial vibration at the tip of the coil end portion, thereby reducing the electromagnetic vibration that causes a large displacement in the radial direction. Is to provide.

  The stator of the rotating electrical machine of the embodiment has a stator core, a plurality of slots, a lower coil and an upper coil, and a connection conductor. The plurality of slots are formed so as to penetrate the stator core in the axial direction, and are arranged side by side along the circumferential direction. The lower coil and the upper coil are housed in two layers in each of the plurality of slots. The connecting conductor series-connects the lower coil housed in the slot and the coil end portions protruding from the stator core of the upper coil. And the tip position of the coil end part in the lower coil and the tip position of the coil end part in the upper coil are shifted in the circumferential direction. Further, of the two slots adjacent in the circumferential direction, the coil end portion of the lower coil housed in one slot and the coil end portion of the upper coil housed in the other slot are insulated. They are connected by block spacers.

The figure seen from the axial direction which shows the coil end part of the stator coil of 1st Embodiment. The figure seen from the radial direction which shows the coil end part of the stator coil of 1st Embodiment. Sectional drawing which follows the AA line | wire of FIG. 2 shown including an adjacent stator coil. The figure by the arrow B of FIG. 2 which shows the coil end part of the stator coil of 2nd Embodiment. The figure equivalent to the cross section which follows the AA line of FIG. 2 which shows the coil end part of the stator coil of 3rd Embodiment. The figure equivalent to the cross section which follows the AA line of FIG. 2 which shows the coil end part of the stator coil of 4th Embodiment. The figure by the arrow B of FIG. 2 which shows the coil end part of the stator coil of 5th Embodiment. The difference of the magnitude | size of the rigidity of a block spacer by the direction of external force is shown, (a)-(c) is explanatory drawing for every state of a block spacer.

  Hereinafter, a stator of a rotating electrical machine according to an embodiment will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram seen from the axial direction showing the coil end portions 1a, 2a of the stator coil 101 of the first embodiment, and FIG. 2 is a diagram seen from the radial direction showing the coil end portions 1a, 2a. is there.
As shown in FIGS. 1 and 2, the rotating electrical machine 100 is used as a turbine generator, for example, and is disposed in a substantially cylindrical stator 102 and rotatably in the radial center of the stator 102. And a rotor (not shown).

  The stator 102 has a stator core 7 formed by laminating a plurality of laminated steel plates. A slot 8 is formed in the stator core 7 so as to be long in the radial direction and to penetrate in the axial direction. A plurality of slots 8 are formed and arranged side by side along the circumferential direction.

  Each slot 8 houses a stator coil 101. The stator coil 101 has a two-layer structure of an upper coil 1 disposed on the radially outer side of each slot 8 and a lower coil 2 disposed on the radially inner side. Each of the coils 1 and 2 is a bundle of a plurality of hollow or solid strands. That is, the upper coil 1 is obtained by bundling both ends of a plurality of strands with clips 3, and the lower coil 2 is obtained by bundling both ends of a plurality of strands with clips 4.

Further, the upper coil 1 and the lower coil 2 respectively protrude from both axial ends of the stator core 7. Hereinafter, the protruding portions are referred to as a coil end portion 1a of the upper coil 1 and a coil end portion 2a of the lower coil 2. In addition, since these coil end parts 1a and 1b are bent in the shape of a three-dimensional curve, they are also called involute parts.
The ends of the coil end portion 1 a of the upper coil 1 and the coil end portion 2 a of the lower coil 2 housed in the slot 8 are connected in series by connecting conductors 5, respectively. The clips 3 and 4 and the connection conductor 5 are covered with an insulating coating 6.

  Here, the length of the coil end portion 1a of the upper coil 1 housed in the slot 8 (connected in series) and the length of the coil end portion 2a of the lower coil 2 are set to different lengths. . More specifically, the length of the coil end portion 1 a of the upper coil 1 is set shorter than the length of the coil end portion 2 a of the lower coil 2. By setting in this way, the tip position of the coil end portion 1a of the upper coil 1 connected in series and the tip position of the coil end portion 2a of the lower coil 2 are shifted in the circumferential direction.

This shift will be described in more detail with reference to FIG.
FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 including the adjacent coils.
As shown in the figure, the tip end position of the coil end portion 1a of the upper coil 1 connected in series and the tip end position of the coil end portion 2a of the lower coil 2 are the coil end portions 1a, 2a adjacent in the circumferential direction. (Hereinafter, referred to as the pitch between the tips of the coil end portions 1a and 2a). Particularly in this embodiment, the coil end portions 1a and 2a are displaced in the circumferential direction by one pitch in the pitch between the tips.

  Therefore, when the total number N of stator coils 101 (upper coil 1 and lower coil 2) from # 1 to #N are accommodated in the respective slots 8 in order, the coil end portion of the upper coil 1 of # 1 The tip of 1a and the clip 3 and the tip of the coil end portion 2a and the clip 4 of the lower coil 2 of #N are located on the same radial line L.

  Similarly, the tip of the coil end portion 1a and the clip 3 in the upper coil 1 of # 2 and the tip of the coil end portion 2a and the clip 4 of the lower coil 2 of # 1 are located on the same radial line L. . The tip of the coil end portion 1a and the clip 3 in the upper coil 1 of # 3 and the tip of the coil end portion 2a and the clip 4 in the lower coil 2 of # 2 are located on the same radial line L. And this is comprised over the whole circumferential direction.

Here, #NO. The clip 3 of the upper coil 1 and the clip 4 of the lower coil 2 which are different from each other are connected in the radial direction by a block spacer 10 disposed between the opposing side surfaces of the clips 3 and 4 in the radial direction.
The block spacer 10 used has a layer structure in which a sheet-like felt member 11 in which a resin agent is infiltrated is arranged at both ends in the compression direction P, and a solid block 12 is sandwiched between the felt members 11 at both ends. ing. Therefore, the compression direction P corresponds to the layer direction, and the shearing direction corresponds to the direction along the joint surface of the felt member 11 to the solid block 12.

Based on FIG. 8A to FIG. 8C, the block spacer 10 will be described in more detail.
FIG. 8 shows the difference in the rigidity of the block spacer 10 depending on the direction of the external force, and (a) to (c) are explanatory diagrams for each state of the block spacer 10.
As shown in FIG. 8A, the block spacer 10 has a layer structure in which sheet-like felt members 11 are arranged at both ends in the compression direction P, and a solid block 12 is sandwiched between the felt members 11 at both ends. Therefore, as shown in FIG. 8 (b), when an external force F is applied on the base K and applied in the compression direction P, which is the layer direction, the compressive deformation is reduced and the rigidity is high. Demonstrate.
On the other hand, as shown in FIG. 8C, when the same external force F is applied in the shearing direction T perpendicular to the layer direction, the shear deformation becomes remarkably large and the rigidity becomes low. This is a result of the characteristic that the shear rigidity of the felt members 11 at both ends is low.

  In the coil end portions 1 a and 2 a of the stator coil 101 (upper coil 1 and lower coil 2) of the first embodiment, the block spacer 10 is formed of the upper coil 1 arranged on the same radial line L of the stator core 7. The clip 3 and the clip 4 of the lower coil 2 are press-fitted in a state where the felt members 11 at both ends are in contact with the outer surface of the insulating coating 6 on the opposite side surfaces of the clips 3 and 4 in the radial direction. And the resin agent is heat-dried on it, and both the clips 3 and 4, the solid block 12, and the felt member 11 are fixedly integrated. Thereby, the clip 3 of the upper coil 1 and the clip 4 of the lower coil 2 are connected.

  Thus, in the first embodiment described above, #NO. The clip 3 of the upper coil 1 and the clip 4 of the lower coil 2 that are different from each other are connected in the radial direction by a block spacer 10 in which the compression direction P exhibiting high rigidity is directed in the radial direction. On the other hand, the same #NO. The tips of the coil end portions 1 a and 2 a of the upper coil 1 and the lower coil 2 are connected to each other through a connection conductor 5. Therefore, each of the coils 1 and 2 drawn out from the slots 8 adjacent in the circumferential direction is supported by the block spacer 10 and the connecting conductor 5, and the rigidity of the coil end portions 1a and 2a is increased. Can be increased. In particular, since the block spacer 10 is provided so as to connect the coil end portions 1a and 2a in the radial direction, the rigidity of the coil end portions 1a and 2a in the radial direction can be increased, and the block spacer 10 is large in the radial direction. This can contribute to the reduction of electromagnetic vibration that causes displacement.

  Further, the amount of deviation in the circumferential direction of the tips of the coil end portions 1a and 2a is set to an integral multiple of the pitch between the tips of the coil end portions 1a and 2a. In particular, in this embodiment, the tip end of the coil end portion 1a of the upper coil 1 and the tip end of the coil end portion 2a of the lower coil 2 are circumferentially arranged by one pitch in the pitch between the tip ends of the coil end portions 1a and 2a. It is staggering. For this reason, each coil end part 1a, 2a each pulled out from the slot 8 adjacent to the circumferential direction becomes a form which overlaps in a radial direction. Since the block spacer 10 is provided between the coil end portions 1a and 2a having such a shape, the rigidity in the radial direction of the coil end portions 1a and 2a can be more effectively increased.

  Further, the lengths of the coil end portions 1a and 2a are set to be different from each other. More specifically, the length of the coil end portion 1 a of the upper coil 1 is set shorter than the length of the coil end portion 2 a of the lower coil 2. Since the rotating electrical machine 100 can be made compact by this short setting, the total length of the upper coil 1 and the lower coil 2 is shortened, so that an effect of reducing copper loss can be expected.

The block spacer has a layer structure in which a sheet-like felt member 11 in which a resin agent is infiltrated is disposed at both ends in the compression direction P, and a solid block 12 is sandwiched between the felt members 11 at both ends. Therefore, the compression direction P corresponds to the layer direction, and the shearing direction corresponds to the direction along the joint surface of the felt member 11 to the solid block 12. For this reason, the rigidity of the radial direction of each coil end part 1a, 2a can be improved reliably.
And the block spacer 10 is comprised so that both the clips 3 and 4, the solid block 12, and the felt member 11 may adhere and be integrated, when a resin agent is heat-dried. For this reason, the coil end portions 1a and 2a can be reliably connected by the block spacer 10 while ensuring the insulation of the coil end portions 1a and 2a.

(Second Embodiment)
Next, a second embodiment will be described based on FIG.
FIG. 4 is a diagram showing the coil end portions 1a and 2a of the stator coil 101 according to the second embodiment, and corresponds to the above-described view of FIG. In the following description, the same reference numerals are given to the same aspects as those of the first embodiment described above, and the description thereof is omitted (the same applies to the following embodiments).

As shown in FIG. 4, the difference between the first embodiment and the second embodiment described above is that, in the first embodiment, a block spacer 10 is provided between the clips 3 and 4 of the coil end portions 1a and 2a. In the second embodiment, the block spacer 10 is provided between the connection conductors 5 adjacent to each other in the circumferential direction.
The shape of the block spacer 10 is different from that of the first embodiment described above, but the function is the same as that of the first embodiment described above. Omitted (the same applies to the block spacer 10 described in the following embodiment).

  Here, as described above, the pitch between the tips of the coil end portions 1a of the upper coil 1 connected in series and the pitch between the tips of the coil end portions 2a of the lower coil 2 are shifted in the circumferential direction by one pitch. Yes. In other words, the tip of the coil end portion 1a of the upper coil 1 housed in the slot 8 and the tip of the coil end portion 2a of the lower coil 2 are arranged with an angular difference in the circumferential direction by one pitch. Yes. Thereby, the connection conductor 5 that connects the coil end portions 1 a and 2 a in series is arranged in a posture in which the longitudinal direction is inclined by the angle θ with respect to the radial direction of the stator core 7. Therefore, the connection conductors 5 are arranged side by side in the circumferential direction in a posture inclined by an angle θ with respect to the radial direction of the stator core 7.

  Under such a configuration, the connection conductors 5 adjacent to each other in the circumferential direction are continuously connected in the circumferential direction by the block spacer 10 disposed between the outer surfaces of the insulating coating 6 on the opposite side surfaces of the two connection conductors 5. Has been. The block spacer 10 has an insulating property and is configured such that the rigidity in the compression direction P is larger than the rigidity in the shear direction, and the block spacer 10 is arranged with the compression direction P directed in a direction perpendicular to the opposite side surfaces of both connection conductors 5. Has been.

  More specifically, in the coil end portions 1a and 2a of the stator coil 101, felts at both ends are provided between the connection conductors 5 adjacent to each other in the circumferential direction on the outer surface of the insulating coating 6 on the opposite side surfaces of the two connection conductors 5. The block spacer 10 is press-fitted with the member 11 in contact. And the connection conductor 5, the solid block 12, and the felt member 11 are fixedly integrated by heat-drying the resin agent on it. Thereby, in the coil end part, the clip 3 of the upper coil 1 and the clip 4 of the lower coil 2 are continuously connected in an annular shape.

  As described above, in the above-described second embodiment, the connecting conductor 5 between the upper coil 1 and the lower coil 2 connected in series has an angle with respect to the radial direction, so that it is inserted between the inclined connecting conductors 5. The block spacer 10 also has an angle with respect to the radial direction. For this reason, the component force of the external force which acts on the radial direction can be made to act on the compression direction P which exhibits high rigidity. As a result, the radial rigidity of the coil end portion can be increased, which can contribute to the reduction of electromagnetic vibration that causes a large displacement in the radial direction.

(Third embodiment)
Next, a third embodiment will be described based on FIG.
FIG. 5 is a view showing the coil end portions 1a and 2a of the stator coil 101 of the third embodiment, and corresponds to a cross-sectional view taken along the line AA of FIG.
As shown in the figure, in the third embodiment, #NO. In addition to the clip 3 of the upper coil 1 and the clip 4 of the lower coil 2 being connected by the block spacer 10, the clips 3 of the upper coil 1 adjacent in the circumferential direction are also connected by the block spacer 10. This is different from the first embodiment described above.

  Here, the block spacer 10 newly added from the first embodiment described above is provided between the clips 3 of the upper coil 1 adjacent in the circumferential direction and between the outer surfaces of the insulating coating 6 on the opposite side surface of the clip 3 at both ends. The felt member 11 is press-fitted in a contact state. And the resin agent is heat-dried on it, and both the clips 3 and 4, the solid block 12, and the felt member 11 are fixedly integrated. Thereby, in the clip 3 at the tip of the coil end portion 1a, the upper coil 1 is continuously connected in an annular shape.

  Therefore, according to the above-mentioned 3rd Embodiment, the rigidity of both the radial direction and the circumferential direction in the coil end part 1a of the upper coil 1 can be improved simultaneously. For this reason, the electromagnetic vibration in the rotary electric machine 100 can be further reduced.

  It is assumed that the block spacer 10 is provided only between the clips 3 of the upper coil 1 adjacent in the circumferential direction. In this case, it is difficult to suppress the radial displacement of the ring vibration generated in the coil end portion 1a. That is, as described with reference to FIG. 8 of the first embodiment, when the external force F is applied in the compression direction P, which is the layer direction, the block spacer 10 is small in compressive deformation and exhibits high rigidity. On the other hand, when the same external force F is applied in the shearing direction T perpendicular to the layer direction, the shear deformation becomes significantly large and the rigidity becomes low. For this reason, if the block spacer 10 is provided only between the clips 3 of the upper coil 1 adjacent in the circumferential direction, it is difficult to reduce electromagnetic vibration in the rotating electrical machine 100.

(Fourth embodiment)
Next, a fourth embodiment will be described based on FIG.
FIG. 6 is a view showing the coil end portions 1a and 2a of the stator coil 101 of the fourth embodiment, and corresponds to a cross-sectional view taken along the line AA of FIG.
As shown in the figure, in the fourth embodiment, in addition to the clips 3 of the upper coil 1 adjacent in the circumferential direction being connected by the block spacer 10, the lower coil 2 adjacent in the circumferential direction is also provided. The clips 4 are also connected by a block spacer 10. This is different from the above-described third embodiment.

  Here, the block spacer 10 newly added from the above-described third embodiment has felts at both ends on the outer surface of the insulating coating 6 on the opposite side surface of the clip 4 between the clips 4 of the lower coil adjacent in the circumferential direction. It is press-fitted with the member 11 in contact. And the resin agent is heat-dried on it, and both the clips 3 and 4, the solid block 12, and the felt member 11 are fixedly integrated. Thereby, the upper coil 1 and the lower coil 2 are continuously connected in an annular shape in the clips 3 and 4 of the coil end portions 1a and 2a.

  Therefore, according to the above-mentioned 4th Embodiment, the rigidity of both the radial direction and the circumferential direction in coil end part 1a, 2a of each coil 1 and 2 can be improved simultaneously. For this reason, the electromagnetic vibration in the rotary electric machine 100 can be further reduced.

(Fifth embodiment)
Next, a fifth embodiment will be described based on FIG.
FIG. 7 is a diagram illustrating the coil end portions 1a and 2a of the stator coil 101 according to the fifth embodiment, and corresponds to the above-described view of FIG.

As shown in the figure, in the fifth embodiment, a connection bar is provided at the tip of the coil end portion 1a serving as the terminal portion of the upper coil 1 and the tip of the coil end portion 2a serving as the terminal portion of the lower coil 2, respectively. 15 and 16 are connected. This is different from the first embodiment described above.
Here, on the side where the connection ring (not shown) is arranged on the outer periphery of the lower coil 2, the connection bars 15 and 16 connected to the connection ring are connected to the terminal portions of the upper coil 1 and the lower coil 2 connected in series. There is a need to.

Each connection bar 15, 16 extends linearly outward in the radial direction.
Here, for example, when the tip (clip 3) of the coil end portion 1a of the upper coil 1 connected in series and the tip (clip 4) of the coil end portion 2a of the lower coil 2 are arranged on the same radius line The connection bar that extends from the terminal portion of the upper coil 1 to the outer peripheral side may interfere with the connection bar that also extends from the terminal portion of the lower coil 2 to the outer peripheral side. For this reason, it is necessary to bend the connection bar extending from the terminal portion of the upper coil 1 to the outer peripheral side so as not to interfere.

  However, the tip end (clip 3) of the coil end portion 1a of the upper coil 1 connected in series and the tip end (clip 4) of the coil end portion 2a of the lower coil 2 are at the pitch between the tip ends of the coil end portions 1a and 2a. If it is shifted in the circumferential direction by one pitch, both connection bars 15 and 16 will not interfere with each other. For this reason, both the connection bars 15 and 16 can extend radially outward.

  Thus, according to the above-mentioned 5th Embodiment, it becomes unnecessary to perform the extra bending process on the connection bars 15 and 16, and can improve productivity. Further, since the interference between the connection bars 15 and 16 is eliminated, the space for arranging the connection bars 15 and 16 can be saved. Since the space can be saved, the work space can be afforded, so that the connection workability is also improved.

  In the above-described embodiment, the tip position of the coil end portion 1a of the upper coil 1 connected in series and the tip position of the coil end portion 2a of the lower coil 2 are 1 in the pitch between the tip ends of the coil end portions 1a and 2a. The case where it has shifted in the circumferential direction by the pitch has been described. However, the present invention is not limited to this, and the circumferential shift amount at the tip positions of the coil end portions 1a and 2a may be set to an integral multiple of the pitch between the tip ends of the coil end portions 1a and 2a. By comprising in this way, each coil end part 1a, 2a becomes a form which overlaps in a radial direction. Since the block spacer 10 is provided between the coil end portions 1a and 2a having such a shape, the rigidity in the radial direction of the coil end portions 1a and 2a can be effectively increased.

  Note that the compression direction P (see FIG. 8) of the block spacer 10 can be made to follow the radial direction even if the tips of the coil end portions 1a and 2a are simply displaced in the circumferential direction. Therefore, even if the circumferential shift amount at the tip position of each coil end portion 1a, 2a is not set to an integral multiple of the pitch between the tip ends of the coil end portions 1a, 2a, each coil end portion 1a, 2a. The rigidity in the radial direction can be increased.

  In the above-described embodiment, the length of the coil end portion 1a of the upper coil 1 is longer than the length of the coil end portion 2a of the lower coil 2 in order to shift the tips of the coil end portions 1a and 2a in the circumferential direction. The case where the setting is short has been described. However, the present invention is not limited to this, and the length of the coil end portion 2 a of the lower coil 2 may be set shorter than the length of the coil end portion 1 a of the upper coil 1. Furthermore, the lengths of the coil end portions 1a and 2a may be set to be the same, and the tips of the coil end portions 1a and 2a and the clips 3 and 4 may be shifted in the circumferential direction.

  Moreover, in the above-mentioned embodiment, the rotary electric machine 100 demonstrated the case where it was used as a turbine generator, for example. However, it is not restricted to this, The rotary electric machine 100 can be used for various uses.

According to at least one embodiment described above, the rigidity of the coil end portions 1a, 2a in the radial direction can be increased by shifting the coil end portions 1a, 2a of the coils 1, 2 connected in series in the circumferential direction. Can be increased. For this reason, it can contribute to reduction of the electromagnetic vibration which produces a big displacement in a radial direction.
Further, by setting the circumferential shift amount of the tips of the coil end portions 1a and 2a to one pitch in the pitch between the tips of the coil end portions 1a and 2a, the slots 8 adjacent to each other in the circumferential direction are respectively set. The drawn out coil end portions 1a and 2a overlap each other in the radial direction. For this reason, the rigidity of the radial direction of each coil end part 1a, 2a can be improved more effectively.

  Furthermore, the length of the coil end portion 1 a of the upper coil 1 is set shorter than the length of the coil end portion 2 a of the lower coil 2. Since the rotating electrical machine 100 can be made compact by this short setting, the total length of the upper coil 1 and the lower coil 2 is shortened, so that an effect of reducing copper loss can be expected.

The block spacer has a layer structure in which a sheet-like felt member 11 in which a resin agent is infiltrated is disposed at both ends in the compression direction P, and a solid block 12 is sandwiched between the felt members 11 at both ends. Therefore, the compression direction P corresponds to the layer direction, and the shearing direction corresponds to the direction along the joint surface of the felt member 11 to the solid block 12. For this reason, the rigidity of the radial direction of each coil end part 1a, 2a can be improved reliably.
And the block spacer 10 is comprised so that both the clips 3 and 4, the solid block 12, and the felt member 11 may adhere and be integrated, when a resin agent is heat-dried. For this reason, the coil end portions 1a and 2a can be reliably connected by the block spacer 10 while ensuring the insulation of the coil end portions 1a and 2a.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Upper coil, 1a, 2a ... Coil end part, 2 ... Lower coil, 3, 4 ... Clip, 5 ... Connection conductor, 6 ... Insulation coating, 7 ... Stator core, 8 ... Slot, 10 ... Block spacer, 11 ... Felt member, 12 ... Solid block, 15, 16 ... Connection bar, 100 ... Rotating electric machine, 101 ... Stator coil, 102 ... Stator

Claims (9)

A stator core,
A plurality of slots formed so as to penetrate the stator core in the axial direction and arranged side by side along the circumferential direction;
A lower coil and an upper coil housed in two layers in each of the plurality of slots;
Connection conductors connecting the coil ends protruding from the stator core of the lower coil and the upper coil housed in the slot in series,
With
The tip position of the coil end part in the lower coil and the tip position of the coil end part in the upper coil are arranged shifted in the circumferential direction,
Of the two slots adjacent in the circumferential direction, the coil end portion of the lower coil housed in one of the slots, and the coil end portion of the upper coil housed in the other slot, A stator of a rotating electric machine in which the insulating block spacers are connected to each other.   The block spacer is configured such that the rigidity in the compression direction is greater than the rigidity in the shear direction, and the direction in which the coil end portion of the lower coil and the coil end portion of the upper coil face each other and the compression The stator of the rotating electrical machine according to claim 1, wherein the stator is arranged so that the direction is the same direction. The block spacer is
At each end to which the coil end portion is connected, a felt member infiltrated with a resin agent is disposed, and a layer structure in which a solid block is sandwiched between the felt members at both ends is formed.
By pressing and arranging the felt member in contact with the coil end portion of the lower coil and the coil end portion of the upper coil, and then the resin agent is heated and dried. The stator for a rotating electrical machine according to claim 2, wherein each of the coil end portions, the solid block, and the felt member are fixedly integrated.   The tip position of the coil end portion in the lower coil and the tip position of the coil end portion in the upper coil are shifted in the circumferential direction by an integral multiple of the pitch between the tip ends of the coil end portions adjacent in the circumferential direction. The stator for a rotating electrical machine according to any one of claims 1 to 3, wherein the stator is disposed.   5. The tip position of the coil end portion in the lower coil and the tip position of the coil end portion in the upper coil are arranged so as to be shifted in the circumferential direction by one pitch of the pitch between the tips. Stator of rotating electrical machine.   The coil end portions of the lower coil and the upper coil housed in the slot are formed so as to have different projecting lengths from the stator core, whereby the coil end portion of the lower coil is formed. The stator of the rotating electrical machine according to any one of claims 1 to 5, wherein a leading end position of the upper end coil and a leading end position of the coil end portion of the upper coil are shifted in a circumferential direction.   The stator for a rotating electrical machine according to any one of claims 1 to 6, wherein the connection conductors adjacent in the circumferential direction are connected by the block spacer.   8. The device according to claim 1, wherein at least one of the lower coils adjacent to each other in the circumferential direction and the upper coils adjacent to each other in the circumferential direction are connected by the block spacer. Stator for rotating electric machine. Two connection bars connected to the ends of the coil end portions of the lower coil and the upper coil housed in the slot;
The fixing of the rotating electrical machine according to any one of claims 1 to 8, wherein the two connection bars are arranged such that the longitudinal direction thereof is along the radial direction and are arranged side by side in the circumferential direction. Child.

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