JP2017093034A - Dynamo-electric machine and method of manufacturing dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamo-electric machine capable of guaranteeing sufficient waterproof performance with less effort, with regard to a dynamo-electric machine housing a rotor and a stator in the housing.SOLUTION: A dynamo-electric machine 1 houses a rotor 10 and a stator 30 in a housing 40, and has a leader line 36 led out from a coil end 35, a tube member 60, a grommet 65, and a water stop part 75. The leader line 36 is led out of the housing 40, via a lead-out hole 53 of a first cover 50. The tube member 60 is disposed on the outer peripheral surface of the leader line 36, and has a plurality of protrusions 61 and a plurality of communication holes 62. The grommet seals between the outer peripheral surface of the tube member 60 and the opening edge of the lead-out hole 53, and protects the tube member 60 and the leader line 36. The water stop part 75 is formed by filling between the surface of the leader line 36 with varnish V in the tube member 60, by varnish impregnation process.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine configured by housing a rotor and a stator in a housing, and a method of manufacturing the rotating electrical machine.

  2. Description of the Related Art Conventionally, as a rotating electrical machine, a housing in which a rotor and a stator are housed is known, and the rotor is rotated by supplying electric power to a stator coil portion of the stator. That is, in order to supply electric power to the stator coil portion of the stator, the lead wire is drawn from the stator coil portion of the stator to the outside of the housing.

  In such a configuration, since an opening for drawing out the lead wire is formed in the housing, it is important to ensure the waterproof performance (water stopping performance) in the rotating electrical machine. As an invention made to guarantee such waterproof performance, for example, the invention of Patent Document 1 is known.

  In the invention described in Patent Document 1, the covered cable of the electric device is drawn out from the inside of the pressure vessel to the outside where the pressure is low so as to penetrate the pressure vessel, and the penetration portion between the covered cable and the pressure vessel Is liquid-tightly closed by a gland packing and a clamping gland. And the cylindrical compressor is compression-molded and arrange | positioned with respect to the outer periphery of a covered cable in at least one place of a covered cable, and clamp | tightens the perimeter of a covered cable with a substantially uniform pressure. . That is, the invention described in Patent Document 1 is configured such that even if liquid penetrates into the inside of the sheath of the covered cable by tightening with the compressor, it cannot move out of the pressure vessel through the inside of the sheath. The water stopping performance is guaranteed.

JP 2010-226771 A

  When the invention described in Patent Document 1 is adopted in order to guarantee the waterproof performance in the rotating electrical machine, the cylindrical compressor is compression molded with respect to the coated cable (corresponding to the lead wire of the present invention), and the coated cable A process of tightening the entire circumference of the plate with a substantially uniform pressure is required. This process is a process necessary only for improving the waterproof performance, separately from the manufacturing process of the rotating electrical machine. That is, when the invention described in Patent Document 1 is used, there is a possibility that an increase in the manufacturing process (man-hours) of the rotating electrical machine and an increase in the number of parts may be caused in order to improve the waterproof performance.

  The present invention relates to a rotating electrical machine and a manufacturing method of the rotating electrical machine configured by housing a rotor and a stator in a housing, and provides a rotating electrical machine and a manufacturing method of the rotating electrical machine that can ensure sufficient waterproof performance with a small number of man-hours.

  A rotating electrical machine according to one aspect of the present invention is provided with a rotor that is fixed to a rotating shaft that is rotatably arranged, and rotates together with the rotating shaft, a stator core that is disposed radially outside the rotor, and the stator core A rotating electrical machine comprising: a coil wound around; a stator having a coil end portion protruding in an axial direction from an axial end surface of the stator core; and a housing that accommodates the rotor and the stator therein. A lead wire extending from the coil end portion and drawn out to the outside of the housing through a lead hole opened in the housing, and provided on an outer peripheral surface of the lead wire and penetrating the housing through the lead hole And arranged so as to seal between the insulating tube member, the outer peripheral surface of the tube member, and the opening edge of the extraction hole. A grommet which is, by a varnish which imparts insulating properties to the stator, between the lead wire surface in the interior of the tube member and having a waterproof part filled.

  The rotating electrical machine is configured by housing a rotor and a stator inside the housing, and can supply the current to the coil of the stator to rotate the rotor together with the rotating shaft. Further, the rotating electrical machine includes a lead wire extending from a coil end portion in the stator, a tube member, a grommet, and a water stop portion. The lead wire is led out from the coil end portion of the stator to the outside of the housing through a lead hole opened in the housing. The tube member has insulating properties, is provided on the outer peripheral surface of the lead wire, and is disposed so as to penetrate the housing through the lead hole. The grommet is disposed so as to seal between the outer peripheral surface of the tube member and the opening edge of the extraction hole. And the said water stop part is comprised with the varnish which provides insulation with respect to the said stator, and the space between the said leader lines is filled in the inside of the said tube member. That is, according to the rotating electrical machine, the drawer hole formed in the housing can be sealed by the cooperation of the lead wire, the tube member, the grommet, and the water stop portion, and thus the waterproof performance of the rotating electrical machine. Can be secured. Further, according to the rotating electrical machine, the water stop portion is configured by filling the space between the lead wire surface and the lead wire inside the tube member with the varnish, so that the varnish can insulate the stator. Simultaneously with the step of imparting (such as a varnish impregnation step for the stator), the water stop portion can be formed. That is, according to the rotating electrical machine, the water stop portion can be formed by performing a conventional process called a process of imparting insulation to the stator with varnish, thereby increasing the number of steps. The waterproof performance of the rotating electrical machine can be ensured without any problems.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to claim 1, wherein the water stop portion is located on the coil end portion side in the tube member. It is located in the position between the edge part of this and the attachment position of the grommet with respect to the said tube member, It is characterized by the above-mentioned.

  In the rotating electrical machine, the water stop portion is located between the end portion of the tube member located on the coil end portion side and the attachment position of the grommet with respect to the tube member. positioned. That is, according to the rotating electric machine, the varnish for forming the water stop portion does not adhere to the attachment position of the grommet with respect to the tube member. Can be improved.

  And the rotary electric machine which concerns on the other side surface of this invention is a rotary electric machine of Claim 1 or Claim 2, Comprising: The said tube member protrudes from the inner surface of the said tube member, and contacts the surface of the said leader line. A plurality of protrusions are provided at an end portion of the tube member on the coil end portion side.

  In the rotating electrical machine, the tube member has a plurality of protrusions that protrude from the inner surface of the tube member and come into contact with the surface of the lead wire at the end of the tube member on the coil end portion side. Here, a varnish forms a water stop part by hardening | curing in the process of flowing down between the inner surface of a tube member, and the surface of a leader line. In this regard, according to the rotating electrical machine, since the plurality of protrusions protrude from the inner surface of the tube member and come into contact with the surface of the leader line, the varnish between the inner surface of the tube member and the surface of the leader line is provided. The time required to flow down can be increased. That is, according to the rotating electrical machine, by forming a plurality of protrusions on the inner surface of the tube member, a sufficient time is secured for the varnish to harden, so that the space between the inner surface of the tube member and the surface of the leader line is secured. The water stop part which seals can be formed reliably.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to any one of claims 1 to 3, wherein the tube member is a member of the tube member positioned on the coil end portion side. A communication hole that communicates the inside and the outside of the tube member is provided at a position between the end portion and the attachment position of the grommet with respect to the tube member.

  In the rotating electrical machine, the tube member includes a communication hole that communicates the inside and the outside of the tube member, an end portion of the tube member that is positioned on the coil end portion side, and an attachment position of the grommet with respect to the tube member. It is in a position between. According to the rotating electrical machine, the varnish is supplied not only to the end portion side of the tube member located on the coil end portion side but also to the space between the inner surface of the tube member and the surface of the leader line from the communication hole. Since it can do, a water stop part can be formed reliably.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to any one of claims 1 to 4, wherein the lead wire is a coil end of the stator housed inside the housing. It is pulled out from the part in the axial direction in the stator through the lead-out hole of the housing.

  In the rotating electrical machine, the lead wire is led out in the axial direction of the stator from a coil end portion of the stator accommodated in the housing through a lead hole of the housing. That is, according to the rotating electrical machine, when the varnish is impregnated into the stator with the tube member attached to the lead wire, it is simply moved in the axial direction of the stator so that the space between the inner surface of the tube member and the lead wire surface is reduced. Thus, the varnish can be supplied, and the water stop portion can be reliably formed.

  A method of manufacturing a rotating electrical machine according to another aspect of the present invention includes a rotor fixed to a rotating shaft that is rotatably disposed, and a rotor that rotates together with the rotating shaft, and a stator core that is disposed radially outside the rotor. A rotating electrical machine including: a stator wound around the stator core; a stator having a coil end portion protruding in the axial direction from an axial end surface of the stator core; and a housing housing the rotor and the stator therein. A tube attaching step of attaching an insulating tube member to a lead wire extending from the coil end portion, and a varnish comprising the stator to which the tube member is attached to the lead wire. And impregnating the stator with insulation, and filling the space between the lead wire inside the tube member A water stop part forming step for forming a water stop part, and a rotating electrical machine assembly process for housing the stator having the water stop part formed inside the tube member in the housing together with the rotor. The rotating electrical machine assembling step includes a lead wire drawing step for drawing out the lead wire while disposing a grommet between the lead hole of the housing and the tube member.

  The manufacturing method of the rotating electrical machine includes a tube attaching process, a water stop forming process, and a rotating electrical machine assembling process, and the rotating electrical machine assembling process includes a lead wire drawing process. In the tube attaching step, an insulating tube member is attached to the lead wire extending from the coil end portion. And in a water stop part formation process, while impregnating the said stator with which the said tube member was attached with respect to the said lead wire in a varnish, and providing insulation with respect to the said stator, inside the said tube member A water stop portion filled with a space between the leader lines is formed. In the rotating electrical machine assembly process, the stator in which the water stop portion is formed inside the tube member is housed in the housing together with the rotor. In the lead wire drawing step, the lead wire is pulled out while a grommet is disposed between the lead hole of the housing and the tube member. Therefore, according to the manufacturing method of the rotating electrical machine, by performing the rotating electrical machine assembly process including the tube mounting process, the water stop forming process, and the lead wire drawing process, the waterproof performance is increased without increasing the number of steps. A rotating electrical machine that can be secured can be manufactured.

  According to the present invention, the rotor and the stator are housed inside the housing, and further, the lead wire of the coil end portion in the stator, the tube member, the grommet, and the water stop portion are provided. . The lead hole formed in the housing can be sealed by the cooperation of the lead line, the tube member, the grommet, and the water stop portion, thereby ensuring the waterproof performance of the rotating electrical machine. Moreover, since the water stop part is filled with the varnish between the inside of the said tube member with the said leader line surface, it is performed conventionally from the process of providing insulation with respect to the said stator with a varnish. By performing the process, the water stop portion can be formed, and the waterproof performance of the rotating electrical machine can be secured without increasing the number of steps.

It is sectional drawing which shows schematic structure of the rotary electric machine which concerns on this embodiment. It is a cross-sectional enlarged view which shows the leader line vicinity of the rotary electric machine which concerns on this embodiment. It is an upper surface enlarged view which shows the leader line vicinity of the rotary electric machine which concerns on this embodiment. It is an enlarged view which shows the leader line and water stop part in a tube member inside. It is explanatory drawing which shows the tube attachment process in this embodiment. It is explanatory drawing which shows the masking process in a water stop part formation process. It is explanatory drawing which shows the varnish impregnation process in a water stop part formation process. It is explanatory drawing which shows the structure of the grommet which concerns on other embodiment of this invention.

  Hereinafter, an embodiment in which a rotating electrical machine and a manufacturing method of the rotating electrical machine according to the present invention are applied to the rotating electrical machine 1 will be described in detail with reference to the drawings.

(Schematic configuration of rotating electrical machine)
First, a schematic configuration of the rotating electrical machine 1 according to the present embodiment will be described in detail with reference to FIG. The rotating electrical machine 1 according to the present embodiment is an IPM motor (embedded permanent magnet motor). As shown in FIG. 1, a rotor 10 and a stator 30 that generates a rotating magnetic field by a three-phase alternating current are provided inside the housing 40. It is housed and configured. The rotating electrical machine 1 rotates the rotor 10 together with the rotating shaft 20 by a rotating magnetic flux generated by supplying a three-phase alternating current to the stator coil 32 of the stator 30.

  As shown in FIG. 1, the rotor 10 includes a rotor core 11, and is rotatably supported around the axis of the rotary shaft 20 on the radially inner side of the stator 30. In the rotor 10, permanent magnets as magnetic field generation sources are embedded along the circumferential direction of the rotor core 11 so that the directions of the magnetic fields with respect to the stator 30 are alternately opposite.

  The rotor core 11 is configured in a cylindrical shape so as to surround the rotating shaft 20 by laminating a plurality of plates made of electromagnetic steel plates, and is fixed to the rotating shaft 20. Further, the outer peripheral surface of the rotor core 11 is opposed to the above-described inner peripheral surface (the surface on the rotating shaft 20 side) of the stator 30 with a predetermined interval.

  The rotary shaft 20 is rotatably supported via a bearing 25 disposed in the housing 40 and functions as the rotation center of the rotor 10. The rotating shaft 20 extends in the front-rear direction at the center of the stator 30 in the vertical cross section of the rotating electrical machine 1. Note that the end (the lower end in FIG. 1) of the rotating shaft 20 extends to the outside of the housing 40 and is connected to the output transmission unit O. The output transmission unit O includes, for example, a mechanism that transmits a rotational force such as a gear box, a gear, and a pulley. Therefore, the rotating electrical machine 1 can output the rotational drive of the rotor 10 to an external device via the output transmission unit O.

  The stator 30 is fixed inside the housing 40 and includes a substantially cylindrical stator core 31 and a stator coil 32 wound around the stator core 31. The stator core 31 has a substantially cylindrical shape formed by laminating a plurality of electromagnetic steel plates. The stator core 31 has a plurality of teeth and slots (not shown) that are distributed in the circumferential direction and extend in the axial direction. Each slot is formed between the circumferential directions of the two teeth.

  The stator coil 32 is constituted by a conducting wire C, and is wound around the teeth through each slot formed in the stator core 31. As described above, since the stator 30 is a stator of the rotating electrical machine 1 driven by a three-phase alternating current, the stator 30 includes a three-phase stator coil 32 of a U phase, a V phase, and a W phase, and an alternating current of each phase. Is supplied to generate a rotating magnetic flux. The stator coil 32 of each phase is wound over a plurality of slots formed in the stator core 31 so as to cover the axial end surface of the stator core 31. Therefore, the coil end portions 35 are formed on both sides in the axial direction of the stator core 31 so as to protrude from the axial end surface of the stator core 31 as a part of the stator coil 32 in the stator 30.

  As shown in FIGS. 1 and 2, a lead wire 36 is drawn from the coil end portion 35 located on one end side in the axial direction of the stator 30. The lead wire 36 is a lead wire C drawn from the coil end portion 35 in order to supply current to the stator coil 32. In the present embodiment, the lead wire 36 has three phases of U phase, V phase, and W phase. This is a general term for the leader line 36. The lead wires 36 of each phase (that is, the U phase, the V phase, and the W phase) are connected to an AC power supply outside the housing 40 through a lead hole 53 of the first cover 50 that constitutes the housing 40 described later. The coil end portion 35 is formed with a neutral point by bundling and connecting the conductive wires C constituting the stator coil 32 of each phase (ie, U phase, V phase, and W phase).

  The housing 40 includes a first cover 50 and a second cover 55, and accommodates the rotor 10 and the stator 30 by being attached to the stator core 31 (see FIG. 1). . The first cover 50 constitutes a part of the housing 40 on one end side in the axial direction of the rotating electrical machine 1 (on the end side opposite to the output transmission portion O), and the rotor 10 and the stator 30 on one end side in the axial direction. Covering.

  The first cover 50 includes an end surface 51 formed in a substantially disk shape and a peripheral surface 52 erected from the periphery of the end surface 51. The end surface 51 of the first cover 50 includes A lead hole 53 is formed. The lead-out hole 53 is used when the lead-out line 36 is pulled out from the stator 30 accommodated in the housing 40 toward the AC power supply outside the housing 40. Therefore, in the present embodiment, each lead line 36 is drawn in the axial direction of the stator 30 toward the side opposite to the output transmission unit O side.

  The second cover 55 constitutes a part of the housing 40 on the other end side in the axial direction of the rotating electrical machine 1 (that is, the output transmission portion O side), and covers the rotor 10 and the stator 30 on the other end side in the axial direction. . Similar to the first cover 50, the second cover 55 includes an end surface 56 formed in a substantially disk shape and a peripheral surface 57 erected from the periphery of the end surface 56, and is attached to the stator core 31. It is done.

  The tube member 60 is formed in an insulative cylindrical shape, and has a plurality of protrusions 61 and a plurality of communication holes 62. The tube member 60 is attached so as to surround the outer peripheral surface of each lead wire 36 drawn from the coil end portion 35 of the stator 30. The inner diameter of the tube member 60 is formed to be slightly larger than the outer diameter of the lead wire 36. Therefore, when the varnish V is impregnated with the stator 30 in order to provide insulation to the stator 30, the varnish V can exist between the outer surface of the lead line 36 and the inner surface of the tube member 60. .

  As shown in FIG. 2, the plurality of protrusions 61 are formed so as to protrude from the inner surface of the tube member 60 at the end of the tube member 60 on the coil end portion 35 side. The plurality of protrusions 61 are formed so as to come into contact with the surface of the leader line 36 when the tube member 60 is attached to the leader line 36. Accordingly, when the varnish V is impregnated with the stator 30, the plurality of protrusions 61 each cause the flow of the varnish V between the outer surface of the lead wire 36 and the inner surface of the tube member 60 to It changes to a direction and the flow to the coil end part 35 side is prevented. Accordingly, the plurality of protrusions 61 can increase the time during which the varnish V stays between the outer surface of the lead wire 36 and the inner surface of the tube member 60 on the coil end portion 35 side of the tube member 60. , And can contribute to the formation of the water stop portion 75 by the varnish V.

The plurality of communication holes 62 are formed by communicating the inside and outside of the tube member 60 at predetermined intervals in the circumferential direction of the tube member 60 (see FIG. 2). Therefore, as shown in FIG.
When the varnish V in the varnish tank T is impregnated with the stator 30, the varnish V is supplied to the space between the outer surface of the lead line 36 and the inner surface of the tube member 60 through the plurality of communication holes 62. It becomes possible. As shown in FIG. 2, in the tube member 60, the plurality of protrusions 61 are located closer to the coil end portion 35 than the plurality of communication holes 62, so that the varnish V supplied from the communication holes 62 is outside the tube member 60. In the meantime, the flow of the varnish V can be inhibited. That is, the communication hole 62 can surely contribute to the formation of the water stop portion 75 by the varnish V.

  The plurality of communication holes 62 are formed between the end of the tube member 60 positioned on the coil end portion 35 side and a predetermined range corresponding to the end surface 51 of the first cover 50 (that is, a grommet mounting position PG described later). It is arranged at the position. When the stator 30 is impregnated in the varnish V of the varnish tank T, the plurality of communication holes 62 can be immersed in the varnish V without being immersed to the grommet mounting position PG.

  Here, if the varnish V adheres to the grommet mounting position PG (see FIGS. 5 to 7) and the varnish V is cured as it is dried, the outer dimensions of the lead wire 36 and the tube member 60 are increased. There is a possibility that workability such as the operation of attaching the grommet 65 to the lead wire 36 and the tube member 60 and the operation of drawing the lead wire 36 and the tube member 60 from the lead hole 53 to which the grommet 65 is attached may be reduced. In this regard, by forming the plurality of communication holes 62 at such positions, the water stop portion 75 can be reliably secured using the communication holes 62 while suppressing the varnish V from adhering to the grommet mounting position PG. Can be formed.

  The grommet 65 is a cylindrical member through which the lead wire 36 and the tube member 60 can be inserted, and is disposed to protect the lead wire 36 and the tube member 60 from the opening edge of the lead hole 53 in the first cover 50. ing. As shown in FIGS. 1 and 2, the grommet 65 is disposed so as to seal between the outer peripheral surface of the tube member 60 and the opening edge of the extraction hole 53. The space between the outer peripheral surface and the opening edge of the extraction hole 53 is waterproofed.

  As shown in FIGS. 1 to 3, the grommet fixing member 70 is a plate-like member having an opening through which the lead wire 36 and the tube member 60 related to the U phase, the V phase, and the W phase can be inserted. It is fixed with respect to the end surface 51. The grommet fixing member 70 cooperates with the end surface 51 of the first cover 50 to sandwich the grommet 65 and fix it to a predetermined range including the extraction hole 53.

  As shown in FIGS. 1 to 4, the water stop portion 75 is formed by filling the inside of the tube member 60 with the varnish V between the surface of the lead wire 36 and the inside of the tube member 60. In FIG. 5, the inside of the tube member 60 is stopped in cooperation with the lead wire C of the lead wire 36. The water stop 75 is formed by immersing the stator 30 in the varnish V of the varnish tank T (see FIG. 7) in order to provide insulation to the stator 30. This will be described in detail later with reference to the drawings.

  As shown in FIG. 2, the water stop portion 75 includes an end portion of the tube member 60 located on the coil end portion 35 side in the tube member 60, and a mounting position of the grommet 65 with respect to the tube member 60. And a grommet mounting position PG (that is, a position corresponding to the opening edge of the extraction hole 53). Therefore, when forming the water stop part 75 in this position, possibility that the varnish V will adhere to the grommet attachment position PG can be reduced.

  As a result, the presence of the varnish V attached to the grommet attachment position PG does not hinder the operation of attaching the grommet 65 to the lead line 36 to which the tube member 60 is attached. It is possible to improve the work efficiency related to the attachment of 65. Further, by suppressing the adhesion of the varnish V to the grommet mounting position PG, the grommet 65 can be more closely attached to the outer surface of the tube member 60 (that is, the grommet mounting position PG). Thereby, the rotary electric machine 1 can ensure the waterproof performance between the outer surface of the tube member 60 and the inner surface of the grommet 65.

  With this configuration, the rotating electrical machine 1 according to the present embodiment seals the drawing hole 53 in the housing 40 by the cooperation of the drawing line 36, the tube member 60, the grommet 65, and the water stop portion 75. Thus, the waterproof performance of the rotating electrical machine 1 can be ensured. Further, in the rotating electrical machine 1, the water stop portion 75 is formed by immersing the stator 30 in the varnish V of the varnish tank T in order to provide insulation to the stator 30, that is, the rotation According to the electric machine 1, since the water stop part 75 can be formed by performing the process conventionally performed called the process of providing insulation with respect to the said stator 30 by the varnish V, a man-hour is increased. The waterproof performance of the rotating electrical machine 1 can be ensured without any problem.

(Manufacturing method of the rotating electrical machine 1 according to the present embodiment)
Next, a method for manufacturing the rotating electrical machine 1 according to the present embodiment will be described in detail with reference to the drawings. In the method of manufacturing the rotating electrical machine 1 according to the present embodiment, a tube attachment process for attaching the tube member 60 to each lead wire 36 in the stator 30, and the water stop portion 75 is formed by the varnish V inside the tube member 60. The rotating electrical machine assembling process includes assembling the rotating electrical machine 1 using the stator 30 that has undergone the water stopping part forming process, and the rotating electrical machine assembling process includes a drawing hole 53 of the first cover 50. In addition, a lead wire drawing step for drawing the lead wire 36 to the outside of the housing 40 through the tube member 60 and the grommet 65 is included.

  In the following description of the manufacturing method, the stator 30 in the following state is assumed. In this case, the stator 30 includes a U-phase, a V-phase, and a W-phase constituted by the conductor C with respect to each slot and teeth of the substantially cylindrical stator core 31 formed by laminating a plurality of electromagnetic steel plates. It is assumed that a three-phase stator coil 32 is wound. At this time, coil end portions 35 are respectively formed on the axial end surfaces of the stator core 31. From the coil end portion 35 on one end side in the axial direction, three-phase lead lines of U phase, V phase, and W phase are provided. 36 is drawn out along the axial direction of the stator 30.

(Tube mounting process)

  First, the tube attachment process which comprises the manufacturing method of the rotary electric machine 1 which concerns on this embodiment is demonstrated, referring FIG. In the tube attachment process according to the present embodiment, the conductors C constituting the lead wires 36 of the respective phases led out from the coil end portion 35 are bundled and bundled for each phase of the U phase, the V phase, and the W phase. Tube members 60 are attached to the lead lines 36 of the respective phases.

  At this time, the tube member 60 is positioned with respect to the lead wire 36 of each phase so that the end on the side where the plurality of protrusions 61 and the plurality of communication holes 62 are formed is positioned on the axial end surface side of the stator core 31. Attached. Accordingly, the plurality of protrusions 61 are located at the end on the coil end portion 35 side of the grommet mounting position PG in the tube member 60 and are located on the coil end portion 35 side of the plurality of communication holes 62. (See FIG. 2).

(Water stop formation process)
Next, the water stop part formation process which comprises the manufacturing method of the rotary electric machine 1 which concerns on this embodiment is demonstrated in detail, referring FIG. 6, FIG. The water stop portion forming step includes a masking step for preventing the varnish V from adhering to the outer peripheral surface of the stator core 31 and a varnish impregnating step for imparting insulation to a necessary portion of the stator 30.

(Masking process)
The masking process which comprises a water stop part formation process is demonstrated referring FIG. The masking step is performed before the varnish impregnation step for forming the water stop portion 75 in the tube member 60 at the same time as providing the insulating properties to the necessary portions in the stator 30 by the varnish V in the water stop portion forming step. Done as a stage. Specifically, in the masking process according to the present embodiment, the masking material M is disposed on the stator 30 to which the tube member 60 is attached to the lead wire 36 of each phase. The masking material M is disposed so as to cover the outer surface of the stator core 31 of the stator 30. When the stator 30 is immersed in the varnish V in the varnish tank T in the varnish impregnation step, the outer surface of the stator core 31 is covered from the varnish V. Protect.

  When the masking process is completed, a pre-heat treatment is performed on the stator 30 on which the masking material M is disposed. In the pre-heat treatment, the temperature difference from the varnish V in the varnish tank T in the varnish impregnation step is reduced by preheating the stator 30 on which the tube member 60 and the masking material M are disposed. . Thereby, in the varnish impregnation process to be described later, when the stator 30 is immersed in the varnish tank T, it is possible to prevent the varnish V from being cooled and solidified before reaching the necessary portion of the stator 30. The varnish V can be reliably filled with respect to a required location.

(Varnish impregnation process)
Then, the varnish impregnation process which comprises a water stop part formation process is demonstrated, referring FIG. In the varnish impregnation step, the stator 30 on which the masking material M is disposed by the masking step is immersed in the varnish V in the varnish tank T, so that the stator coil 32 and the like are impregnated with the varnish V, and the stator coil 32 has a side surface that imparts insulation to the surface and the like. Further, in the varnish impregnation step according to the present embodiment, the water stop portion 75 is formed by the varnish V by supplying the varnish V into the tube member 60 attached to each lead wire 36 by the tube attachment step. It has a side.

  Specifically, first, the stator 30 that has undergone the masking step is placed on the varnish-impregnated basket B with the coil end portion 35 from which the lead wire 36 of each phase is drawn out facing upward. Then, the stator 30 is immersed in the varnish V in the varnish tank T by lowering the varnish impregnating basket B into the varnish tank T.

  At this time, the descending amount of the varnish impregnating basket B is controlled in consideration of the rise in the liquid level of the varnish V accompanying the immersion of the varnish impregnating basket B and the stator 30. Specifically, the liquid level of the varnish V in the varnish impregnating basket B is lower than the grommet attachment position PG in the tube member 60 attached at a predetermined position of the lead line 36 and has a plurality of communication holes 62. It controls so that it may be located above (refer FIG. 7).

  As a result, the stator 30 is immersed in the varnish V of the varnish impregnating basket B except for the lead wire 36 and a part of the tube member 60 (that is, a portion above the grommet mounting position PG). As a result, the varnish V can be impregnated into the stator 30 except for the portion where the masking material M is disposed, and the insulating properties can be imparted to the stator coil 32 and the like by surface treatment using the varnish V. it can.

  As shown in FIG. 7, when the stator 30 is immersed in the varnish V in the varnish impregnating basket B, the lower part of the tube member 60 from the grommet mounting position PG is positioned below the liquid level of the varnish V. Therefore, the plurality of communication holes 62 and the lower end portion of the tube member 60 (that is, the end portion on the coil end portion 35 side) are disposed in the varnish V in the varnish tank T. As a result, the varnish V is supplied between the inner surface of the tube member 60 and the surface of the lead wire 36 via the plurality of communication holes 62 and the lower end portion of the tube member 60. Thereby, in the inside of the tube member 60, the gap | interval of the conducting wire C which comprises the leader line 36 will be in the state filled with the varnish V. FIG.

  By immersing the stator 30 in the varnish tank T to sufficiently impregnate the varnish V, the varnish impregnation rod B is raised and the stator 30 is pulled up. At this time, the varnish V flows toward the lower end of the tube member 60 as the stator 30 is pulled up between the inner surface of the tube member 60 and the surface of the lead wire 36.

  Here, as shown in FIG. 2, a plurality of protrusions 61 are formed on the inner surface of the tube member 60 on the coil end portion 35 side, and the plurality of protrusions 61 are respectively formed on the surface of the lead line 36. In contact. Therefore, the flow of the varnish V toward the lower end portion of the tube member 60 is changed in the circumferential direction of the tube member 60 by the plurality of protrusions 61 until the varnish V flows out from the lower end portion of the tube member 60. The time required for this can be prolonged.

  As a result, the state where the space between the inner surface of the tube member 60 and the surface of the lead wire 36 is filled with the varnish V can be maintained at the lower end of the tube member 60 (that is, the coil end portion 35 side). Time until V hardens can be earned. And in the lower end part (namely, coil end part 35 side) of the tube member 60, the varnish V of the state filled with the space between the inner surface of the tube member 60 and the leader line 36 is hardened, and this embodiment is concerned. A water stop portion 75 is formed.

(Rotating electrical machine assembly process)
The rotating electrical machine assembly process constituting the manufacturing method of the rotating electrical machine 1 according to the present embodiment uses the stator 30 in which the water stop part 75 is formed inside the tube member 60 by the water stop part forming process. It is a process of assembling and includes a leader line drawing process.

  The rotor 10 fixed to the rotary shaft 20 is disposed on the inner side of the stator 30 in which the water stop portion 75 is formed inside the tube member 60. Then, the first cover 50 is attached to one end side of the stator core 31 in the axial direction, and the second cover 55 is attached to the other end side of the stator core 31 in the axial direction, so that the rotor 10 and the rotary shaft 20 are accommodated inside the housing 40. The rotating electrical machine 1 according to the present embodiment is assembled.

(Leader line drawing process)
In this rotating electrical machine assembly process, when the first cover 50 is attached to the one axial end side of the stator core 31, a lead line drawing process for drawing out the lead lines 36 of the respective phases from the lead holes 53 of the first cover 50 is performed. In the lead wire drawing process, the lead wire 36 of each phase is drawn from the lead hole 53 while the tube member 60 and the grommet 65 are arranged between the opening edge of the lead hole 53 of the first cover 50 (FIG. 2). reference).

  Specifically, first, the first cover 50 is attached to one end in the axial direction of the stator 30 while the lead wires 36 of the respective phases are inserted into the lead holes 53 of the first cover 50. Next, the grommet 65 is attached to the lead wire 36 of each phase drawn from the lead hole 53 of the first cover 50. At this time, the grommet 65 is attached so as to be positioned at the grommet attachment position PG of the tube member 60 attached to the lead line 36 of each phase, and is disposed along the end surface 51 of the first cover 50.

  Here, as shown in FIG. 7, in the varnish impregnation step, the grommet mounting position PG is located above the liquid level of the varnish V in the varnish tank T. V does not adhere. Therefore, the attachment work of the grommet 65 to the grommet attachment position PG of the tube member 60 is not hindered by the varnish V attached to the grommet attachment position PG, and the attachment work can be performed efficiently.

  Thereafter, in order to fix the grommet 65, the grommet fixing member 70 is fixed to the end surface 51 of the first cover 50. Specifically, the grommet fixing member 70 is moved toward the end surface 51 of the first cover 50 while the lead lines 36 of the respective phases are inserted through the openings of the grommet fixing member 70. Thereafter, as shown in FIG. 2, the grommet fixing member 70 is fixed to the end surface 51 of the first cover 50 in a state where the lead lines 36 and the tube members 60 of the respective phases are positioned in the opening of the grommet fixing member 70. Set up. As a result, the grommet 65 is nipped and fixed between the end face 51 of the first cover 50 and the grommet fixing member 70.

  And the rotary electric machine 1 which concerns on this embodiment is manufactured by fixing the position of the grommet 65 in the 1st cover 50 with the grommet fixing member 70. FIG. Note that the description of the process such as connection with the output transmission unit O is omitted.

  As described above, the rotating electrical machine 1 according to the present embodiment is configured by housing the rotor 10 and the stator 30 in the housing 40, and supplying current to the stator coil 32 of the stator 30. The rotor 10 can be rotated together with the rotary shaft 20. The rotating electrical machine 1 includes a lead wire 36 of the coil end portion 35 in the stator 30, a tube member 60, a grommet 65, and a water stop portion 75.

  As shown in FIG. 2, the lead wire 36 is led out from the coil end portion 35 of the stator 30 to the outside of the housing 40 through a lead hole 53 opened in the first cover 50, and the stator coil A current is supplied to the conductive wire C constituting the line 32. The tube member 60 is formed in an insulating cylindrical shape, is provided on the outer peripheral surface of the lead wire 36, and is disposed so as to penetrate the end surface 51 of the first cover 50 through the lead hole 53. ing. The grommet is disposed so as to seal between the outer peripheral surface of the tube member 60 and the opening edge of the extraction hole 53, and protects the tube member 60 and the extraction line 36. The water stop portion 75 is formed by filling the space between the surface of the lead wire 36 inside the tube member 60 with a varnish V that provides insulation to the stator 30.

  That is, according to the rotating electrical machine 1, the lead-out hole 53 formed in the housing 40 can be sealed by the cooperation of the lead-out line 36, the tube member 60, the grommet 65, and the water stop part 75, Accordingly, the waterproof performance of the rotating electrical machine 1 can be ensured. Further, according to the rotating electrical machine 1, the water stop portion 75 is formed by filling the space between the lead wire 36 and the surface of the lead wire 36 inside the tube member 60 with the varnish V. At the same time as the varnish impregnation step (see FIG. 7) for imparting insulation to the stator 30, the water stop portion 75 can be formed. That is, according to the rotating electrical machine 1, the water stop portion 75 can be formed by performing a conventional process called a varnish impregnation process, so that the waterproofing of the rotating electrical machine 1 can be performed without increasing the number of steps. Performance can be guaranteed.

  The water stop portion 75 includes an end portion of the tube member 60 located on the coil end portion 35 side in the tube member 60 and a mounting position of the grommet 65 with respect to the tube member 60 (that is, a grommet). It is located at a position between the mounting position PG) (see FIG. 2). That is, according to the rotating electrical machine 1, in the varnish impregnation step (see FIG. 7), the varnish V for forming the water stop portion 75 is attached to the attachment position of the grommet 65 to the tube member 60. Therefore, the workability regarding the attaching operation of the grommet 65 to the tube member 60 can be improved.

  A plurality of protrusions 61 protrude from the inner surface of the tube member 60 and are in contact with the surface of the lead wire 36 at the end of the tube member 60 on the coil end portion 35 side. (See FIG. 2). Here, the varnish V is cured in the process of flowing down between the inner surface of the tube member 60 and the surface of the lead line 36 in the varnish impregnation step, thereby forming the water stop portion 75. In this respect, according to the rotating electrical machine 1, since the plurality of protrusions 61 are provided on the inner surface of the tube member 60, the varnish V flows down between the inner surface of the tube member 60 and the surface of the lead line 36. The time required can be increased. That is, according to the rotating electrical machine 1, by forming the plurality of protrusions 61 on the inner surface of the tube member 60, a sufficient time is secured for the varnish V to be cured, and thus the inner surface of the tube member 60 is pulled out. The water stop part 75 which seals between the surfaces of the wire | line 36 can be formed reliably.

  Also, a plurality of communication holes 62 for communicating the inside and the outside of the tube member 60 are provided, the end of the tube member 60 located on the coil end portion 35 side, and the mounting position of the grommet 65 with respect to the tube member 60 (that is, , And the grommet mounting position PG) (see FIG. 2). Thereby, according to the said rotary electric machine 1, in the varnish impregnation process (refer FIG. 7), not only the end part side of the said tube member 60 in the coil end part 35 side but the tube member 60 is also from the some communicating hole 62. FIG. Since the varnish V can be supplied between the inner surface of the lead wire 36 and the surface of the lead line 36, the water stop portion 75 can be reliably formed.

  As shown in FIG. 1, FIG. 2, etc., in the rotating electrical machine 1 according to the present embodiment, the lead wire 36 of each phase extends from the coil end portion 35 of the stator 30 housed in the housing 40 to the first cover. The stator 30 is pulled out in the axial direction through 50 lead-out holes 53. That is, according to the rotating electrical machine 1, the varnish V is supplied between the inner surface of the tube member 60 and the surface of the lead wire 36 by simply moving the stator 30 in the axial direction of the stator 30 in the varnish impregnation step. Therefore, the water stop portion 75 can be reliably formed.

  Moreover, the manufacturing method of the rotary electric machine 1 which concerns on this embodiment is a tube attachment process (refer FIG. 5), a water stop part formation process (refer FIG. 6, FIG. 7), a rotary electric machine assembly process (refer FIG. 1), and The rotating electrical machine assembling step has a lead wire drawing step. Therefore, according to the manufacturing method of the rotating electrical machine 1 according to the present embodiment, by performing the rotating electrical machine assembling process including the tube mounting process, the water stop forming process, and the leader drawing process, the lead line 36, By the cooperation of the tube member 60, the grommet 65, and the water stop portion 75, it is possible to manufacture the rotating electrical machine 1 that seals the extraction hole 53 formed in the housing 40 and ensures waterproof performance. Moreover, according to the manufacturing method of the rotating electrical machine 1, the water stop portion 75 is formed by performing a conventional process called a varnish impregnation step (see FIG. 7) constituting the water stop portion forming step. Therefore, it is possible to manufacture a rotating electrical machine that guarantees waterproof performance without increasing the number of steps.

  Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. For example, it is possible to use a grommet 65 having a different shape from the above-described embodiment. As shown in FIG. 8, it is also possible to use a grommet 65 in which a fitting groove 66 is formed over the entire circumference. In this case, the fitting groove 66 in the grommet 65 has a width corresponding to the thickness of the end surface 51 of the first cover 50, and the opening edge of the extraction hole 53 is fitted therein. By comprising in this way, the grommet fixing member 70 can be abbreviate | omitted and, therefore, the manufacturing man-hour of the rotary electric machine 1 can be reduced.

  In the above-described embodiment, the surface of the stator core 31 is covered with the masking material M when performing the masking process as a pretreatment of the varnish impregnation process (see FIG. 6). However, the present invention is not limited to this mode. Absent. For example, in addition to the surface of the stator core 31, the masking material M may be attached to the grommet attachment position PG in the tube member 60 attached to the lead wire 36 of each phase. When the masking material M is attached in this way, the grommet attachment position PG can be brought into a state where the varnish V is not attached by removing the masking material M when the varnish impregnation step is completed. In this case, in the varnish impregnation step, it is possible to control the position of the varnish impregnating basket B with a lower accuracy than the above-described embodiment with respect to the positional relationship with the liquid level of the varnish V.

  In the above-described embodiment, the lead wire 36 is drawn out from the axial direction of the rotating electrical machine 1, but may be configured to be drawn out in the circumferential direction of the rotating electrical machine 1. In this case, if the direction in which the stator 30 is immersed in the varnish tank T is changed according to the configuration, the varnish impregnation step constituting the water stop portion forming step can be appropriately performed. In the above-described embodiment, the protrusion 61 is provided on the inner surface of the tube member 60. However, if the varnish V is cured before flowing down, the protrusion 61 is not necessarily provided. Also good. In the above-described embodiment, the tube member 60 is provided with a plurality of communication holes 62, but the number of communication holes 62 may be one. If the varnish V can enter the tube member 60 and form the water stop portion 75 from the end portion on the coil end portion 35 side of the tube member 60 in the water stop portion forming step, the communication hole 62 is not provided in the tube member 60. May be. In the above-described embodiment, the present invention is used for the IPM motor. However, the present invention may be applied to other types of rotating electrical machines such as induction machines.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 10 Rotor 20 Rotating shaft 30 Stator 31 Stator core 32 Stator coil 35 Coil end part 36 Lead wire 40 Housing 50 First cover 53 Lead hole 55 Second cover 60 Tube member 61 Projection part 62 Communication hole 65 Grommet 70 Grommet fixing member 75 Water stop part V Varnish PG Grommet mounting position

Claims (6)

A rotor fixed to a rotating shaft rotatably disposed, and rotating with the rotating shaft;
A stator having a stator core disposed on the radially outer side of the rotor, a coil wound around the stator core, and a coil end portion protruding in an axial direction from an axial end surface of the stator core;
A rotating electrical machine having a housing that houses the rotor and the stator therein,
A lead wire extending from the coil end portion and drawn out to the outside of the housing through a lead hole opened in the housing;
A tube member that is provided on the outer peripheral surface of the lead wire and is disposed so as to penetrate the housing through the lead hole;
A grommet disposed so as to seal between the outer peripheral surface of the tube member and the opening edge of the extraction hole;
A rotating electrical machine having a water stop portion filled with a space between the lead wire inside the tube member by a varnish that provides insulation to the stator. The rotating electrical machine according to claim 1,
The water stop portion is
The rotary electric machine is located in a position between the end of the tube member located on the coil end side and the attachment position of the grommet to the tube member in the tube member . The rotating electric machine according to claim 1 or 2,
The tube member is
A rotating electrical machine having a plurality of protrusions protruding from an inner surface of the tube member and in contact with a surface of the lead wire at an end portion on the coil end portion side of the tube member. A rotating electrical machine according to any one of claims 1 to 3,
The tube member is
It has a communication hole that communicates the inside and outside of the tube member at a position between the end of the tube member located on the coil end side and the mounting position of the grommet on the tube member. Rotating electric machine. The rotating electrical machine according to any one of claims 1 to 4,
The leader line is
A rotating electrical machine characterized by being drawn in an axial direction of the stator from a coil end portion of the stator accommodated in the housing through a drawing hole of the housing. A rotor fixed to a rotating shaft rotatably disposed, and rotating with the rotating shaft;
A stator having a stator core disposed on the radially outer side of the rotor, a coil wound around the stator core, and a coil end portion protruding in an axial direction from an axial end surface of the stator core;
A method of manufacturing a rotating electrical machine having a housing that houses the rotor and the stator therein,
A tube attaching step for attaching an insulating tube member to the lead wire extending from the coil end portion,
The stator with the tube member attached to the lead wire is impregnated with varnish to provide insulation to the stator, and the space between the lead wire surface and the inside of the tube member is filled. A water stopping part forming step for forming a water stopping part,
A rotating electrical machine assembling step for accommodating the stator in which the water stop portion is formed inside the tube member, together with the rotor, in the housing, and
The rotating electrical machine assembly process includes:
A method of manufacturing a rotating electrical machine, comprising a lead wire drawing step for drawing out the lead wire while arranging a grommet between the lead hole of the housing and the tube member.

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