JP2020025418A - Stator of rotary electric machine and rotary electric machine having the same - Google Patents

Abstract

To provide a stator of a rotary electric machine in which securement of an electric insulating property and improvement of a stator manufacturing property are balanced at a higher level than the prior art, and the rotary electric machine having the same.SOLUTION: With a stator of a rotary electric machine, stator winding are arranged in a plurality of stator slots formed in a stator core. With each of the stator slots, electrically insulating bobbin made of resin in which a plurality of cylindrical spaces for accommodating conductor wires constituting the stator winding are formed in parallel, and whose length of the cylindrical space is equal to or more than an axial length of the stator slots is inserted and fixed through an adhesive layer having a thermal conductivity lower than or equal to that of the electric insulating bobbin. With each of the cylindrical spaces of the electric insulating bobbin, the conductor wire constituting the stator winding are inserted and fixed via the adhesive layer.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technology relating to a rotating electric machine, and more particularly to a stator that contributes to improvement in manufacturability and a rotating electric machine including the stator.

  In a type of rotating electric machine, a stator winding is arranged in a plurality of stator slots formed in a stator core, and a rotating magnetic field is generated by applying a voltage to the stator winding, and the rotating magnetic field generates a rotating magnetic field. There is a rotating electric machine in which a rotor rotates.

  When a voltage is applied to the stator winding, a potential difference is generated between the stator winding and the stator core. Discharge may occur, and the durability and reliability of the rotating electric machine may be significantly impaired. In order to suppress such partial discharge, it is necessary to ensure sufficient electrical insulation between the stator winding and the stator core.

  Further, in recent years, a rotating electric machine has been required to have high output and small size and light weight at the same time, and the winding form of the stator winding has become complicated. Furthermore, there is a strong demand for cost reduction in rotating electrical machines, but due to the complexity of the winding form of the stator windings, securing electrical insulation and improving stator manufacturability have become major issues. I was

  Various technologies have been researched and developed for these problems. For example, in Patent Document 1 (WO 2015/083470), in a rotating electric machine including an iron core having a plurality of slots and a plurality of segment conductors arranged in the slots, the iron core has at least one opening of the slots. Wherein the coil guide includes a slot insertion portion located between the slot and the segment conductor, and at least one partition portion located between the segment conductors, A rotating electric machine in which a portion and the partition portion are arranged in the slot together with the segment conductor is disclosed.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2012-228093) discloses an insulating structure of a coil formed around a tooth, comprising a conductive wire and an insulating coating formed around the conductive wire. The inner coating made of a thermosetting resin disposed on the side, and the outer coating made of a thermoplastic resin containing a foaming agent, wherein the foaming agent foams and expands the volume by the outer coating. There is disclosed an insulating structure of a coil in which insulation between the coils is achieved.

WO 2015/083470 JP 2012-228093 A

  According to Patent Literature 1, it is said that both improvement in manufacturability of the rotating electric machine and securing of electrical insulation can be achieved. The technique of Patent Document 1 can be expected to improve the productivity in that the stator winding can be easily inserted into each slot and the insulating paper that has been required conventionally can be omitted. However, after the insertion and joining of the stator winding, a step of separately applying a filler made of an insulating material to the gap between the slots (the gap between the slot and the stator winding) is required.

  Here, the cooling method of the stator winding includes an indirect cooling method and a direct cooling method. The indirect cooling method is a method in which a water cooling jacket or the like is provided radially outside the stator core, and the stator winding is indirectly cooled through the stator core by heat transfer with cooling water. In this method, the end of the stator winding is directly cooled with cooling oil or the like.

  In recent years, a direct cooling system has been expected from the viewpoint of reducing the size and weight of a rotating electric machine. When the direct cooling method is applied to the rotating electric machine of Patent Document 1 and the cooling jacket on the outer periphery of the stator core is omitted, the temperature of the outer peripheral surface of the rotating electric machine is easily increased, and the thermal effect of the rotating electric machine on peripheral devices is reduced. It may be necessary to consider and take countermeasures.

  On the other hand, in the technique of Patent Document 2, a stator winding is arranged in each slot of a stator core, and then heat treatment is performed on a desired portion to melt a thermoplastic resin of an outer coating and foam a foaming agent therein. This technique expands the molten outer coating to form an insulating layer having a desired thickness. According to Patent Literature 2, it is possible to eliminate the step of inserting insulating paper in interphase insulation in a stator winding or slot insulation for a slot of a stator core, and thus to provide a coil insulation structure with high manufacturing efficiency. ing.

  However, if the foaming degree of the foaming agent varies, the positional relationship between the conductors forming the stator winding may be greatly deviated from the originally desired positional relationship. When the displacement of the positional relationship between the conductors increases, an additional process (that is, additional cost) for correcting the position is generated. Further, the technique of Patent Document 2 has a weak point that when inserting the stator winding into each slot of the stator core, there is a possibility that the possibility that the teeth and the outer coating of the wire are rubbed and the outer coating is damaged cannot be denied. is there.

  In view of the above-described circumstances, the present invention provides higher levels of electrical insulation (i.e., durability and reliability) and improvement in stator manufacturability (i.e., reduction in manufacturing cost) than in the prior art. It is an object to provide a balanced rotating electric machine stator and a rotating electric machine including the stator.

(I) One embodiment of the present invention is a stator for a rotating electric machine,
The stator, a stator winding is disposed in a plurality of stator slots formed in the stator core,
In each of the stator slots, a plurality of cylindrical spaces for accommodating the conductor wires constituting the stator windings are formed in parallel, and the length of the cylindrical spaces is set in the axial direction of the stator slots. An electrical insulating bobbin made of resin that is not less than the length is inserted and fixed via an adhesive layer having a thermal conductivity equal to or less than the thermal conductivity of the electrical insulating bobbin,
In each of the cylindrical spaces of the electrical insulating bobbin, a conductor of the rotating electrical machine, wherein the conductor wire forming the stator winding is inserted and fixed via the adhesive layer. To provide.

According to the present invention, the following improvements and modifications can be added to the stator (I) of the rotating electric machine described above.
(I) The adhesive layer is a foam adhesive layer.
(Ii) The electrical insulating bobbin has a plurality of protrusions that come into contact with the teeth that define the stator slots.
(Iii) The electrical insulating bobbin has a protruding portion inscribed in the teeth claw portion defining the slot opening of the stator slot.
(Iv) In the electric insulating bobbin, a thickness of a side wall arranged in a circumferential direction of the stator slot gradually increases radially outward of the slot.
(V) A plurality of the electrically insulating bobbins are inserted and fixed in the same stator slot.
(Vi) In each of the plurality of cylindrical spaces of the electrically insulating bobbin, a plurality of the conductor wires that are electrically in phase are disposed.

(II) Another aspect of the present invention is a rotating electric machine including a stator,
The present invention provides a rotating electrical machine, wherein the stator is a stator of the rotating electrical machine.

According to the present invention, the following improvements and modifications can be added to the rotating electric machine (II) described above.
(Vii) A mechanism is provided in which the conductor wire in a region of the stator winding protruding from an axial end of the stator core is directly cooled by a refrigerant.

  According to the present invention, it is possible to provide a stator of a rotating electric machine in which securing of electrical insulation and improvement of stator manufacturability are balanced at a higher level than in the related art. In addition, by using the stator, it is possible to provide a rotating electric machine in which securing of durability and reliability and reduction of manufacturing cost are compatible.

It is a longitudinal section showing an example of the rotary electric machine according to the present invention. FIG. 2 is a schematic cross-sectional view illustrating an example of a stator of the rotating electric machine according to the first embodiment. FIG. 3 is an enlarged schematic cross-sectional view of a slot region of the stator shown in FIG. 2. It is a transmission perspective schematic diagram which shows an example of arrangement | positioning relationship between an electric insulation bobbin and a stator core. It is a schematic diagram which shows an example of the stator of the rotary electric machine which concerns on 2nd Embodiment, and is an expanded cross-sectional schematic diagram of the slot area | region of a stator. It is a schematic diagram which shows an example of the stator of the rotary electric machine which concerns on 3rd Embodiment, and is an expanded cross-sectional schematic diagram of the slot area | region of a stator. It is a schematic diagram which shows an example of the stator of the rotary electric machine which concerns on 4th Embodiment, and is an expanded cross-sectional schematic diagram of the slot area | region of a stator. It is a schematic diagram which shows an example of the stator of the rotary electric machine which concerns on 5th Embodiment, and is an expanded cross-sectional schematic diagram of the slot area | region of a stator. It is a schematic diagram which shows an example of the stator of the rotary electric machine which concerns on 6th Embodiment, and is an expanded cross-sectional schematic diagram of the slot area | region of a stator.

  Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings. However, the present invention is not limited to the embodiments described here, and can be appropriately combined with known technology or improved based on known technology without departing from the technical idea of the invention. . In addition, the same reference numerals are given to members having the same meaning, and redundant description may be omitted.

[First Embodiment]
FIG. 1 is a schematic vertical sectional view showing an example of the rotating electric machine according to the present invention. The vertical section of the rotating electrical machine is defined as a section in the direction of the rotation axis (a section whose normal is perpendicular to the rotation axis). As shown in FIG. 1, the rotating electric machine 1 has a stator 10 disposed roughly on the outer peripheral side in a housing 2, a rotor 30 disposed inside the stator 10, It has a structure in which a rotating shaft 31 disposed at the center is supported by the housing 2 via a bearing 32. The stator 10 includes a stator core 11 and a stator winding 13.

  In the rotating electric machine according to the present invention, the configuration of the rotor is not particularly limited, and a known rotor (for example, a permanent magnet rotor having a permanent magnet, a winding rotor having a field winding, A cage rotor having a cage conductor in which both ends of the conductor wire of the rotor are short-circuited, and a reluctance rotor having only a ferromagnetic iron core and no permanent magnet can be appropriately used.

  When the rotating electric machine 1 is operated, a current flows through the stator winding 13 so that the stator winding 13 generates heat and raises the temperature of the entire rotating electric machine 1. When the rotating electric machine 1 is a high-output type, the amount of heat generated by the stator winding 13 increases, so that the stator winding 13 needs to be cooled.

  As described above, the method of cooling the stator winding 13 includes an indirect cooling method and a direct cooling method. The indirect cooling method is a method in which a cooling jacket (for example, a water-cooling jacket) is provided radially outside the stator core 11 and the stator winding 13 is cooled through the stator core 11 by heat transfer with a refrigerant. is there. Although there is an advantage that the cooling capacity is high because heat can be transferred through a relatively large area, there is a disadvantage that the rotating electric machine 1 is easily increased in size and weight.

  On the other hand, the direct cooling method is a method of cooling the end portion 131 of the stator winding 13 (the area where the stator winding 13 protrudes from the stator core 11) with a refrigerant (for example, cooling oil). From the viewpoint of reducing the size and weight of the rotating electric machine, the direct cooling method is preferable. In this case, from the viewpoint of cooling efficiency, it is preferable that the heat insulation is provided between the stator winding 13 and the stator core 11 (in other words, heat conduction from the stator winding 13 to the stator core 11 is small. Is more preferred).

  The stator 10 of the rotating electric machine 1 according to the present invention is characterized in that the heat insulation between the stator winding 13 and the stator core 11 is high. If the heat insulation between the stator winding 13 and the stator core 11 is increased and the direct cooling method is made to function well, it is possible to suppress the rotating electric machine 1 from overheating. This means that the thermal effect from the rotating electric machine 1 to peripheral devices can be reduced, and contributes to layout optimization for minimizing the system in the electric system including the rotating electric machine 1.

  FIG. 2 is a schematic cross-sectional view showing an example of a stator of the rotary electric machine according to the first embodiment, and FIG. 3 is an enlarged schematic cross-sectional view of a slot region of the stator shown in FIG. The cross section of the rotating electric machine is defined as a section orthogonal to the rotation axis (a section whose normal line is parallel to the rotation axis).

  As shown in FIGS. 2 and 3, in the stator 10, a stator winding 13 is provided in a plurality of stator slots 12 (also simply referred to as slots) formed in a stator core 11. In the stator 10 of the present invention, a resin electric insulating bobbin 21 in which a plurality of cylindrical spaces 211 for accommodating the conductor wires 14 constituting the stator winding 13 are formed in parallel, with an adhesive layer 22 interposed therebetween. The present embodiment is characterized in that the conductor wire 14 is inserted and fixed in each of the stator slots 12, and the conductor wire 14 is inserted and fixed in each of the cylindrical spaces 211 via the adhesive layer 23.

  In the stator core 11, a portion that defines the stator slot 12 is referred to as a tooth 121, and a portion that defines the slot opening 123 in an inner peripheral end region of the tooth 121 is referred to as a tooth claw 122.

  The winding method of the stator winding 13 is not particularly limited, and a conventional winding method (for example, distributed winding over a plurality of stator slots 12) can be appropriately used. Also, the number of the cylindrical spaces 211 of the electric insulating bobbin 21 (the number of the conductor wires 14 arranged in the stator slot 12) is not limited to “four” as shown in FIGS. What is necessary is just to set suitably according to the design of an electric machine.

  The electric insulating bobbin 21 is preferably formed of a resin having both electric insulation and heat resistance, and is made of a super engineering plastic (for example, polyphenylene sulfide (PPS), polyether ether ketone (PEEK), liquid crystal polymer). (LCP)) and engineering plastics (for example, polyacetal (POM), polyamide 6 (PA6), polyamide 66 (PA66)). By forming the electric insulating bobbin 21 using the above-described resin as a material, the thermal conductivity of the electric insulating bobbin 21 can be adjusted to 0.2 to 0.35 W / m · K. Note that the material and thermal conductivity of the electrically insulating bobbin 21 are merely examples, and the present invention is not limited thereto. The method of forming the electrical insulating bobbin 21 is not particularly limited as long as a desired shape is obtained, and a conventional forming method (eg, extrusion molding, injection molding) can be appropriately used.

  FIG. 4 is a schematic perspective view showing an example of an arrangement relationship between an electric insulating bobbin and a stator core. In FIG. 4, for simplification of the drawing, the illustration of the stator slot 12, the slot opening 123, and the teeth claw 122 is omitted. As shown in FIG. 4, the electrically insulating bobbin 21 is preferably formed uniformly in the stator slot 12 along the axial direction. With such a shape, it becomes easy to insert the electrically insulating bobbin 21 into the stator slot 12 from either side of the axial end of the stator 10.

  The electrical insulating bobbin 21 preferably has a length (that is, a length of the cylindrical space 211) equal to or longer than the axial length of the stator slot 12, and both ends of the electrical insulating bobbin 21 in the axial direction are fixed. More preferably, it is installed so as to protrude from both ends of the core 11 in the axial direction. The axial end portion of the electric insulating bobbin 21 (particularly, the edge portion in contact with the conductor wire 14) may be chamfered from the viewpoint of preventing cracking of the electric insulating bobbin 21 and preventing damage to the insulating coating of the conductor wire 14. preferable.

  Further, as shown in FIG. 4, end plates 212 may be provided at both axial ends of the electrically insulating bobbin 21. By disposing the end plate 212, it is possible to prevent the axial displacement of the electrical insulating bobbin 21. The material of the end plate 212 is not particularly limited as long as it has both electric insulation and heat resistance. For example, the same material as the electric insulation bobbin 21 can be suitably used. There is no particular limitation on the arrangement method, and the end plate 212 and the electric insulating bobbin 21 may be joined by, for example, an adhesive or welding.

  Since the electrical insulating bobbin 21 has the above-described material and shape, it has an advantage that unlike the conventional electrical insulating paper, it is hard to be twisted or broken in the stator slot 12. In addition, the electrically insulating bobbin 21 has an advantage that the insulating coating of the conductor wire 14 is not damaged. Therefore, the electrically insulating bobbin 21 used in the present invention can extremely effectively play the role of a guide when inserting the conductor wire 14. In other words, it greatly contributes to improving the workability of assembling the stator windings 13. In addition, the fact that the electrical insulating bobbin 21 is less likely to be damaged than the electrical insulating paper contributes to ensuring electrical insulation.

  As the adhesive layer (the adhesive layer 22 for fixing the stator slot 12 and the electric insulating bobbin 21 and the adhesive layer 23 for fixing the electric insulating bobbin 21 and the conductor wire 14), the heat conductivity of the electric insulating bobbin 21 or less is used. It is preferable to use an adhesive layer having thermal conductivity. By using the adhesive layers 22 and 23 having a heat conductivity equal to or lower than the heat conductivity of the electric insulating bobbin 21, heat conduction from the stator winding 13 to the stator core 11 can be suppressed. This is advantageous when the stator winding 13 is cooled by the direct cooling method, and contributes to downsizing of the rotating electric machine.

  There is no particular limitation on the material of the adhesive layers 22 and 23 as long as the material has a thermal conductivity equal to or lower than the thermal conductivity of the electrically insulating bobbin 21 and has heat resistance enough to withstand the environmental temperature of the rotating electric machine as an adhesive. Can be used. When an epoxy resin adhesive is used as an example, the thermal conductivity of the adhesive layers 22 and 23 can be set to about 0.1 to 0.2 W / m · K. Further, it is more preferable to use a foamed adhesive layer as the adhesive layers 22 and 23. The same adhesive may be used for the adhesive layers 22 and 23, or different adhesives may be used.

  When a foamed adhesive layer is used as the adhesive layers 22 and 23, the foamed adhesive layer before foaming (that is, the adhesive layer containing a foaming agent) has a sufficiently small thickness (for example, 20 to 50 μm). There is an advantage that the insertion of the electrically insulating bobbin 21 into the slot 12 and the insertion of the conductor wire 14 into the cylindrical space 211 of the electrically insulating bobbin 21 are not hindered. Further, since the foamed adhesive layer has a thickness increased by foaming, the gap between the stator slot 12 and the electric insulating bobbin 21, and the gap between the electric insulating bobbin 21 and the conductor wire 14 are easily filled, They can be securely fixed.

  In addition, since the foamed adhesive layer has a lower thermal conductivity than the base adhesive alone, it is more advantageous from the viewpoint of suppressing heat conduction from the stator winding 13 to the stator core 11. Further, since the foamed adhesive layer has a lower relative dielectric constant than the base adhesive alone, it is also advantageous from the viewpoint of suppressing partial discharge. Suppression of partial discharge contributes to higher voltage and higher frequency in the rotating electric machine.

  Another advantage of using a foamed adhesive layer is that the electric insulating varnish and the step of filling the electric insulating varnish required for fixing the stator winding and the electric insulating paper in the prior art can be omitted. Can be In particular, the elimination of the electric insulating varnish filling step has a great effect of reducing the cost of the manufacturing apparatus and the operation cost, and greatly contributes to the reduction of the manufacturing cost of the stator.

  The method for forming the foamed adhesive layer is not particularly limited, and a known technique can be appropriately used. For example, after applying and forming a foaming agent-containing adhesive layer on one or both surfaces to be bonded and fixed, or after forming a separately prepared foaming agent-containing adhesive layer film on one of the surfaces to be bonded and fixed, Then, the stator core 11, the electric insulating bobbin 21, and the conductor wire 14 are inserted and arranged so as to have a desired positional relationship. Thereafter, a method of heating by an appropriate heating means to simultaneously perform foaming of the foaming agent and solidification of the adhesive is exemplified.

[Second embodiment]
The second embodiment differs from the first embodiment only in the shape of the electrically insulating bobbin, and is otherwise the same. Therefore, only the shape of the electrically insulating bobbin will be described.

  FIG. 5 is a schematic diagram illustrating an example of a stator of the rotating electric machine according to the second embodiment, and is an enlarged schematic cross-sectional view of a slot region of the stator. As shown in FIG. 5, the electrically insulating bobbin 24 of the second embodiment is characterized in that it has a plurality of projections 242 that are in contact with the teeth 121 that define the stator slots 12.

  Due to the presence of the projection 242, the circumferential position of the electrically insulating bobbin 24 in the stator slot 12 is stably defined. As a result, the conductor wire 14 inserted and fixed in the cylindrical space 241 of the electric insulating bobbin 24 is stably arranged at a desired position, so that the step of forming the stator winding 13 (particularly, the step of joining the conductor wires 14) is performed. Workability is further improved (that is, it contributes to reduction of manufacturing cost).

  The protrusion 242 of the electrically insulating bobbin 24 may be formed over the entire area of the stator slot 12 in the axial direction, or may be formed only on a part of the axial direction. Although there is no particular limitation on the method of forming the projection 242, from the viewpoint of manufacturing cost, it is preferable that the projection 242 be integrally formed with the electrically insulating bobbin 24 by, for example, extrusion or injection molding. In FIG. 5, the cross-sectional shape of the protrusion 242 is rectangular, but the present embodiment is not limited to this. For example, the protrusion 242 may have a trapezoidal shape, a semi-circular shape, or a semi-elliptical shape. Is also good.

[Third embodiment]
The third embodiment also differs from the first embodiment only in the shape of the electrically insulating bobbin, and is otherwise the same. Therefore, only the shape of the electrically insulating bobbin will be described.

  FIG. 6 is a schematic diagram illustrating an example of a stator of the rotating electric machine according to the third embodiment, and is an enlarged schematic cross-sectional view of a slot region of the stator. As shown in FIG. 6, the electrically insulating bobbin 25 of the third embodiment is characterized in that it has a protruding portion 252 inscribed in the tooth claw 122 that defines the slot opening 123 of the stator slot 12.

  The presence of the protruding portion 252 can reinforce the electrical insulating bobbin 25 and prevent the electrical insulating bobbin 25 from cracking. In addition, the teeth claw 122 can be reinforced, and there is an additional operational effect that the teeth claw 122 can be prevented from being undesirably deformed or damaged during the assembly work of the stator.

[Fourth embodiment]
The fourth embodiment is also different from the first embodiment only in the shape of the electrically insulating bobbin, and is otherwise the same. Therefore, only the shape of the electrically insulating bobbin will be described.

  FIG. 7 is a schematic diagram illustrating an example of a stator of the rotating electric machine according to the fourth embodiment, and is an enlarged schematic cross-sectional view of a slot region of the stator. As shown in FIG. 7, in the electrically insulating bobbin 26 of the fourth embodiment, the thickness of the side wall 262 arranged in the circumferential direction of the stator slot 12 gradually increases radially outward of the stator slot 12. There are features where you are.

  This embodiment is particularly effective when the width (circumferential length) of the stator slot 12 gradually increases toward the outside in the radial direction of the stator slot 12. With the structure of the present embodiment, the mechanical strength of the side wall 262 of the electric insulating bobbin 26 can be improved, and the electric insulating bobbin 26 can be prevented from cracking.

[Fifth Embodiment]
The fifth embodiment also differs from the first embodiment only in the configuration of the electrically insulating bobbin, and is otherwise the same. Therefore, only the configuration of the electrically insulating bobbin will be described.

  FIG. 8 is a schematic diagram illustrating an example of a stator of the rotating electric machine according to the fifth embodiment, and is an enlarged schematic cross-sectional view of a slot region of the stator. As shown in FIG. 8, the electrically insulated bobbin 27 of the fifth embodiment has a plurality of electrically insulated sub bobbins (in FIG. 8, electrically insulated sub bobbins 27a and 27b) arranged in the same stator slot 12. There is a feature. In other words, the electric insulating bobbin 27 of the present embodiment has a configuration in which the electric insulating bobbin 21 of the first embodiment is divided into a plurality.

  There is no particular limitation on the number of electrically insulated sub bobbins to be arranged in the same stator slot 12 (in other words, the number of cylindrical spaces per electrically insulated sub bobbin), and it is necessary to make the number of cylindrical spaces of each sub bobbin uniform. Nor. What is necessary is just to select and set suitably according to the design concept of a stator and the design concept of a stator winding.

  According to the configuration of the present embodiment, a molding die for manufacturing the electrically insulated sub bobbin can be simplified, and as a result, the electrically insulated bobbin can be prepared at a lower cost than in the first embodiment. Further, during the assembly work of the stator (for example, during the process of inserting the conductor wire 14), if the electrical insulating bobbin is accidentally damaged, only the sub bobbin including the damaged portion needs to be replaced. In addition, there is a secondary operational effect that recovery from unexpected troubles is facilitated.

[Sixth embodiment]
The sixth embodiment differs from the first embodiment only in the configuration of the stator winding, and is otherwise the same. Therefore, only the configuration of the stator winding will be described.

  FIG. 9 is a schematic diagram illustrating an example of a stator of the rotating electric machine according to the sixth embodiment, and is an enlarged schematic cross-sectional view of a slot region of the stator. As shown in FIG. 9, in the stator winding 15 of the sixth embodiment, a plurality of conductor strands 16 that are electrically in phase with each other are arranged in each of the cylindrical spaces 281 of the electrically insulating bobbin 28. There is a feature in the place. In other words, the stator winding 15 of the present embodiment is configured such that the conductor wire 14 of the stator winding 13 of the first embodiment is electrically connected to a plurality of conductor strands 16 (the conductor strand 16a in FIG. 9). , 16b).

  There is no particular limitation on the number of conductor strands 16 (the number of conductor wire divisions), and it may be appropriately designed in consideration of the workability of assembling the stator winding 15. In addition, since there is no potential difference between the conductor wires of the same phase, partial discharge does not occur between the conductor wires.

  In order to increase the value of the current flowing through the stator winding, it is necessary to increase the cross-sectional area of the conductor wire from the viewpoint of the allowable current density of the conductor wire. At this time, if the cross-sectional area of each conductor wire is simply increased (that is, if a thick conductor wire is used), the bending property of the conductor wire is reduced and the jointability between the conductor wires is also reduced. The productivity of the wire is greatly reduced.

  On the other hand, in the configuration of the present embodiment, the conductor wire forming the stator winding 15 is divided into a plurality of conductor wires 16 that are electrically in phase with each other. There is an operational effect that the cross-sectional area of the conductor wire can be increased without lowering the performance.

  The above-described embodiments have been described to facilitate understanding of the present invention, and the present invention is not limited to only the specific configurations described. For example, it is possible to combine configurations of different embodiments, replace some of the configurations of the embodiments with configurations of common technical knowledge of those skilled in the art, and add configurations of common technical knowledge of those skilled in the art to the configurations of the embodiments. It is. That is, in the present invention, it is possible to delete a part of the configuration of the embodiment of the present specification, replace it with another configuration, and add another configuration without departing from the technical idea of the invention. .

1 ... rotating electric machine, 2 ... housing,
10… stator, 11… stator core,
12 ... stator slot, 121 ... teeth, 122 ... teeth claws, 123 ... slot opening,
13 ... stator winding, 131 ... end part, 14 ... conductor wire,
15 ... stator winding, 16, 16a, 16b ... conductor strand,
21: electric insulating bobbin, 211: cylindrical space, 212: end plate, 22, 23: adhesive layer,
24 ... electric insulating bobbin, 241 ... tubular space, 242 ... projection,
25 ... electric insulating bobbin, 252 ... projecting part,
26… electric insulating bobbin, 262… side wall,
27… electric insulating bobbin, 27a, 27b… electric insulating sub bobbin,
28 ... electric insulating bobbin, 281 ... tubular space,
30 ... rotor, 31 ... rotating shaft, 32 ... bearing.

Claims (9)

A stator of a rotating electric machine,
The stator, a stator winding is disposed in a plurality of stator slots formed in the stator core,
In each of the stator slots, a plurality of cylindrical spaces for accommodating the conductor wires constituting the stator windings are formed in parallel, and the length of the cylindrical spaces is set in the axial direction of the stator slots. An electrical insulating bobbin made of resin that is not less than the length is inserted and fixed via an adhesive layer having a thermal conductivity equal to or less than the thermal conductivity of the electrical insulating bobbin,
The stator of a rotating electric machine, wherein the conductor wire forming the stator winding is inserted and fixed to each of the cylindrical spaces of the electrical insulating bobbin via the adhesive layer. The stator of the rotating electric machine according to claim 1,
The stator for a rotating electric machine, wherein the adhesive layer is a foamed adhesive layer. The stator of the rotating electric machine according to claim 1 or 2,
The stator of a rotating electric machine, wherein the electrical insulating bobbin has a plurality of protrusions that are in contact with teeth defining the stator slot. The stator of the rotating electric machine according to any one of claims 1 to 3,
The stator of a rotating electric machine, wherein the electrical insulating bobbin has a protruding portion inscribed in a tooth claw portion defining a slot opening of the stator slot. The stator of the rotating electric machine according to any one of claims 1 to 4,
The stator of the rotating electric machine, wherein the electrical insulating bobbin has a thickness of a side wall arranged in a circumferential direction of the stator slot gradually increasing radially outward of the stator slot. The stator of the rotating electric machine according to any one of claims 1 to 5,
A stator for a rotating electric machine, wherein a plurality of the electrically insulating bobbins are inserted and fixed in the same stator slot. The stator of the rotating electric machine according to any one of claims 1 to 6,
A stator for a rotating electric machine, wherein a plurality of the conductor wires that are electrically in phase are disposed in each of the plurality of cylindrical spaces of the electrically insulating bobbin. A rotating electric machine having a stator,
A rotating electric machine, wherein the stator is the stator of the rotating electric machine according to any one of claims 1 to 7. The rotating electric machine according to claim 8,
A rotating electrical machine having a mechanism in which a portion of the conductor wire of the stator winding protruding from an axial end of the stator core is directly cooled by a refrigerant.

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