JP2011139588A - Rotary electric machine and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently impregnate a stator winding with varnish. <P>SOLUTION: Four rows of circumferential conductor rows 28R1, 28R2, 28R3, 28R4 are constituted at a coil end 62, and varnish holding members 201, 201, 203 are arranged and installed at a gap between the circumferential conductor rows 28R1, 28R2, at the gap between the circumferential conductor rows 28R2, 28R3, and at the circumferential conductor rows 28R3, 28R4, respectively. The varnish holding members are obtained by forming sheet-like insulating members of, for example, thickness 0.1 to 0.3 mm into a ring shape in advance. When the varnish is dropped at the coil end to cover the winding with the varnish, the varnish is sufficiently charged into gaps among segment conductors 28 by the varnish holding members 201 to 203. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine in which a varnish is applied to a coil end.

  2. Description of the Related Art Conventionally, a rotating electrical machine in which a varnish is applied to a coil end of a rotating electrical machine to improve heat dissipation performance is known.

  When applying the varnish to the coil end, increasing the amount of varnish supplied to ensure the amount of varnish applied not only reduces the varnish use efficiency but also damages the flatness of the stator end face due to varnish adhesion, and the surrounding treatment. The varnish splashes to the tool.

  In the rotating electrical machine of Patent Document 1, a sheet-like varnish support member made of an epoxy resin or the like is provided on the outer peripheral surface of the coil end so that the varnish applied to the coil end does not scatter outside the coil end.

Japanese Patent Publication No. 2007-60824

  In the stator winding of Patent Document 1, varnish scattering to portions other than the stator winding can be prevented, but the varnish penetration in the stator winding is insufficient.

(1) A rotating electrical machine according to the first aspect of the present invention includes a stator core having a plurality of slots, and at least N coil conductors arranged in a radial direction in one slot and wound around the stator core. Each of the N coil conductors in the plurality of slots is annular in the circumferential direction of the stator core. Are arranged in parallel to each other to form first to N-th annular rows, and at least one coil end from which the coil conductors constituting the first to N-th annular rows protrude, between at least one pair of annular rows A varnish holding member made of an insulating material is interposed, and the varnish is applied to the coil end.
(2) According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, the varnish holding member is manufactured in an annular shape in advance.
(3) A third aspect of the present invention is the rotating electrical machine according to the first aspect, wherein the varnish holding member is formed of a belt-shaped member wound in an annular shape.
(4) According to a fourth aspect of the present invention, in the rotating electric machine according to any one of the first to third aspects, the annular varnish holding member is formed in a bellows shape that is bent in the front and back direction. And
(5) According to a fifth aspect of the present invention, in the rotating electrical machine according to any one of the first to fourth aspects, the varnish holding member includes a plurality of through holes for allowing the varnish to permeate at predetermined intervals in the circumferential direction. It is provided.
(6) According to a sixth aspect of the present invention, in the rotating electrical machine according to the fifth aspect, the through hole is a slit extending in the axial direction or a circular shape.
(7) The invention of claim 7 is the rotating electrical machine according to any one of claims 1 to 6, wherein when N is 4, the plurality of coil conductors on the outer diameter side in the plurality of slots are A first annular row is formed by being annularly arranged in the circumferential direction of the stator core, and the second plurality of coil conductors from the outer diameter side in the plurality of slots are arranged in parallel in the circumferential direction of the stator core. The second annular row, the third plurality of coil conductors from the outer diameter side in the plurality of slots are arranged in parallel in the circumferential direction of the stator core to form a third annular row, The fourth plurality of coil conductors from the outer diameter side in the plurality of slots are annularly arranged in the circumferential direction of the stator core to form a fourth annular row, and the varnish holding member includes the first and second varnish holding members. Between the second and third annular rows, and between the third and fourth annular rows, respectively. It is characterized by being arranged.
(8) According to an eighth aspect of the present invention, in the rotating electrical machine according to the seventh aspect, the varnish holding member disposed between the second and third annular rows is more axial than the other varnish holding members. The width of the varnish is made larger so that it protrudes toward the shaft end side than the other varnish holding members.
(9) The invention according to claim 9 is the rotating electrical machine according to any one of claims 1 to 8, wherein the stator winding is constituted by a conducting wire having a rectangular cross section.
(10) The invention of claim 10 is the rotating electrical machine according to claim 9, wherein the conducting wire is a substantially U-shaped segment conductor, and penetrates the slot from one coil end side to the other coil end. Adjacent ends of the plurality of projecting segment conductors are welded and wound as the stator winding.
(11) According to an eleventh aspect of the present invention, in the rotating electrical machine according to the tenth aspect, the varnish holding member is formed of a heat-resistant material.
(12) According to a twelfth aspect of the present invention, in the rotating electrical machine according to the tenth or eleventh aspect, the varnish holding member is disposed on both the one coil end and the other coil end. And
(13) According to a thirteenth aspect of the present invention, in the rotating electrical machine according to any one of the tenth to twelfth aspects, the stator and the rotor are housed in a case, and the rotating shaft of the rotor is in the case. The case is provided with a discharge port through which the cooling refrigerant is dropped onto the coil end, and the discharge port is provided at a position facing the varnish holding member.
(14) According to a fourteenth aspect of the present invention, in the method for manufacturing a rotating electrical machine according to any one of the tenth to thirteenth aspects, the segment conductor is passed through the slot from one coil end side to the other coil. A first step of projecting to the end, a second step of bending the end portion of the segment conductor projecting to the other coil end, a third step of welding the bent end portions of the segment conductor, and the varnish holding And a fourth step of disposing a member between the annular rows of the coil conductors.
(15) The invention of claim 15 is the method of manufacturing a rotating electrical machine according to claim 14, wherein the fourth step is performed before the third step.

  According to the present invention, the varnish can be widely penetrated into the stator winding.

The block diagram which shows the structure of the vehicle carrying the rotary electric machine by this invention. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the whole structure of 1st Embodiment of the rotary electric machine by this invention. The perspective view which shows the stator of the rotary electric machine of FIG. The perspective view which shows the stator winding | coil of U phase. It is a figure explaining the segment conductor of a stator winding | coil, (a) is a figure which shows one segment conductor, (b) is a figure explaining winding formation by a segment conductor, (c) is a segment conductor in a slot FIG. (A) is a cross-sectional perspective view which shows the coil end part of the stator winding | coil in the rotary electric machine of FIG. 2, (b) is a figure explaining the conductor row | line | column by three coil conductors. FIG. 4 is a perspective view of a varnish holding member in the stator winding of FIG. 3. The perspective view which shows a varnish coating device. The perspective view which shows the modification of a varnish holding member. The perspective view which shows the other example of a varnish coating device.

Embodiments of a rotating electrical machine according to the present invention will be described below in detail with reference to the accompanying drawings.
The rotating electrical machine according to the present invention is suitable for use in hybrid vehicles and electric vehicles. As shown in FIG. 1, in a hybrid vehicle, for example, front wheels FW and FW are connected to an engine ENG via a transmission TM, and a motor (rotary electric machine) 100 is connected to the engine ENG and the rear wheels RW and RW, respectively. Connect 100M. The driving force generated by the engine ENG and the rotating electrical machine 100 is shifted by the transmission TM, and the driving force is transmitted to the front wheel side driving wheel FW. In driving the rear wheel, the rotating electrical machine 100M disposed on the rear wheel side and the rear wheel side drive wheel RW are mechanically connected to transmit the driving force.

  The rotating electrical machine 100 starts the engine ENG, and performs a power running operation that generates a driving force and a regenerative operation that recovers energy when the vehicle decelerates according to the traveling state of the vehicle. The driving and power generation operation of the rotating electrical machine 100 are controlled by the power converter (inverter) PC so that the torque and the rotational speed are optimized in accordance with the driving state of the vehicle. The electric power necessary for driving the rotating electrical machine 100 is supplied from the battery BA via the power converter PC. Further, when the rotating electrical machine 100 is in a power generation operation, the battery BA is charged with electrical energy via the power converter PC.

  The rotating electrical machine 100 that is the driving force source on the front wheel side is disposed between the engine ENG and the transmission TM, or is mounted in the transmission TM. In addition, as the rotating electrical machine 100M that is the driving force source on the rear wheel side, a similar one can be used, and a rotating electrical machine having another general configuration can also be used.

  As shown in FIG. 2, the periphery of the rotating electrical machine 100 is surrounded by a case 130. When the rotating electrical machine 100 is disposed between the engine and the transmission, the case 130 includes an engine case or a transmission case. Further, when the rotating electrical machine 100 is mounted in a transmission, the case 130 is constituted by a transmission case.

  The rotating electrical machine 100 is a three-phase synchronous motor with a built-in permanent magnet, and is required to have a small size and a high output. The rotating electrical machine 100 includes a stator 20 and a rotor 11. The stator 20 includes a stator core 21 and a stator winding 40, and the rotor 11 includes a rotor core 12 and a rotating shaft 13. The rotating electrical machine 100 operates as an electric motor when a three-phase alternating current is supplied to the stator winding 40. When the rotating electrical machine 100 is driven by an engine, the rotating electrical machine 100 operates as a generator and generates three-phase AC generated power. Is output. When operating as a generator, the current output from the stator winding 40 is smaller than that when operating as an electric motor (for example, 100 A). Not only the above-described three-phase synchronous motor with a built-in permanent magnet but also an induction motor can be used.

  The stator core 21 is formed by punching or etching a magnetic steel sheet having a thickness of about 0.05 to 1 mm to form a stator core laminate (not shown), and laminating the stator core laminate. Composed. On the inner peripheral side of the stator core laminate, radial recesses and projections are formed at equal intervals in the circumferential direction during molding, and the recesses are continuous when the stator core laminate is laminated. Accordingly, the slot 21S is formed.

  The rotor core 12 is manufactured by laminating thin silicon steel plates, and is fixed to the rotating shaft 13. The rotor 11 includes a permanent magnet 18 and rotates at a predetermined position in the stator 20 at a position facing the stator 20.

  The outer periphery of the stator 20 is fixed to the inner periphery of the housing 50, and the outer periphery of the housing 50 is fixed to the inner periphery of the case 130. The rotating shaft 13 is rotatably supported by bearings 144 and 145 attached to the case 130.

  The rotating electrical machine 100 is cooled by a refrigerant RF such as insulating oil. Therefore, a refrigerant RF reservoir 150 is formed at the bottom of the case 130, and the lower portion of the stator 20 is immersed in the refrigerant RF accumulated in the reservoir 150. The refrigerant RF accumulated in the reservoir 150 is sucked by a pump (not shown) and discharged from the refrigerant outlets 154 and 155 formed in the upper part of the case 130 via the refrigerant passage 153. In the rotating electrical machine 100, the stator winding 40 is a main heat generating portion, and the heat generation is transferred to the case 130 via the stator core 21, and is radiated by the refrigerant RF flowing through the case 130. The

Several refrigerant outlets 154 and 155 are provided in the circumferential direction of the stator 20 at the upper portions of the coil ends 61 and 62 of the stator winding 40. The refrigerant RF discharged from the refrigerant outlets 154 and 155 is directly blown to the coil ends 61 and 62 at both ends of the stator.
In addition, the refrigerant | coolant exits 154 and 155 are provided in the position facing the varnish holding member mentioned later.

  When the rotary electric machine 100 is assembled, the stator 20 is inserted into the housing 50 in advance and attached to the inner peripheral wall thereof, and then the rotor 11 is inserted into the stator 20. Next, the rotating shaft 13 attached to the rotor 11 is assembled to the refrigerant jacket 130 while being fitted to the bearings 144 and 145.

  As shown in FIG. 3, which is a perspective view of the stator 20, a three-phase stator winding 40 of U phase, V phase, and W phase is wound around the stator core 21 with distributed winding. For example, 72 slots 21S extending in parallel with the central axis are formed in the inner circumference of the stator core 21 at equal intervals in the circumferential direction, and a three-phase stator of U phase, V phase, and W phase. The winding 40 is inserted into the slot 21 </ b> S while being insulated by insulating paper (slot liner) 200. The slot liner 200 is disposed so as to wrap around the stator winding 40 in order to prevent the stator winding 40 and the stator core 21 from approaching and short-circuiting.

  Note that the rotating electrical machine 100 shown in FIG. 2 is, for example, a 2Y motor having two systems of three-phase alternating current, and is provided with a total of six U-phase, V-phase, and W-phase windings as shown in FIG. . As shown in FIG. 3, two coil input / output coil conductors 42U, 42V, and 42W for three phases of UVW are provided on one coil end 61, 62 of the stator winding 40, and six coils of two phases each are wound. Six are drawn from the beginning. Also, six neutral point connection conductors 41 (see FIG. 4) are drawn out from the end portions of the six coil windings of the two systems in each phase.

  The stator winding 40 is coated with varnish to provide interphase insulation, interconductor insulation, and insulation between the segment conductor 28 and the stator core 21. In FIG. 3, reference numerals 202, 203, and 204 denote varnish holding members. The varnish holding members 202 to 204 are provided at the coil end 62, and the varnish holding member 204 is provided at the coil end 61. The varnish holding member will be described later.

  With reference to FIGS. 4 and 5, the stator winding 40 will be described in more detail. In the present embodiment, a three-phase stator winding is provided. However, in order to facilitate understanding, FIG. 4 shows a single-phase single-system stator winding 40 and a stator core. 21 and the slot liner 200 are omitted.

  FIG. 4 is a diagram for explaining the U-phase stator winding 40. As shown in FIG. 5A, the stator winding 40 is formed by using a plurality of segment conductors 28 formed in a substantially U shape and welding the end portion 28E. The stator winding 40 is wound as follows. The segment conductors 28 are inserted into the 24 slots 21S assigned to the U phase from one end face side of the stator core 21. The segment conductors 28 are inserted every predetermined number of slots, not adjacent slots. As shown in FIG. 5B, the end portions 28E of the segment conductors 28 are alternately bent, and the end portions 28E of the adjacent segment conductors 28 are welded together. As a result, the U-phase stator winding 40 of FIG. 4 is wound around the stator core 21. The rotating electrical machine 100 of this embodiment is a 2Y motor, and six windings are attached in close contact with the stator core 21 in the entire UVW phase.

  The segment conductor 28 is manufactured using, for example, a rectangular wire having a rectangular cross section covered with an insulating film. The rectangular wire is wound so that the rectangular cross section of the segment conductor is longer in the circumferential direction of the stator core 21 and shorter in the radial direction of the stator core 21 in each slot 21S. In the present embodiment, as shown by reference numerals D1, D2, D3, and D4 in FIG. 5C, four segment conductors 28 are inserted in each slot 21S. Therefore, the stator winding 40 includes four rows of segment conductors 28 arranged in the circumferential direction in the radial direction. These rows are referred to as a first conductor row 28R1, a second conductor row 28R2, a third conductor row 28R3, and a fourth conductor row 28R4 in order from the outer diameter side.

  With reference to FIG. 6, the varnish holding member which is the characteristic of this embodiment is demonstrated. FIG. 6 is an enlarged perspective view of one coil end 62, showing the stator winding 40 protruding from each slot 21S toward the coil end 62 and welded at the end.

  In FIG. 6B, the above-described first conductor row 28R1 is constituted by the three segment conductors 28 denoted by reference numerals D11 to D13. The three segment conductors 28 protrude from different slots. A second conductor row 28R2 is constituted by the three segment conductors 28 indicated by D21 to D23. The three segment conductors 28 protrude from different slots. The three segment conductors 28 indicated by D31 to D33 constitute a third conductor row 28R3. The three segment conductors 28 protrude from different slots. The three segment conductors 28 indicated by D41 to D43 constitute a fourth conductor row 28R4. The three segment conductors 28 protrude from different slots.

  As shown in FIG. 6, a varnish holding member 201 formed of an insulating material is provided between the first conductor row 28R1 and the second conductor row 28R2. A varnish holding member 202 formed of an insulating material is provided between the second conductor row 28R2 and the third conductor row 28R3. A varnish holding member 203 formed of an insulating material is provided between the third conductor row 28R3 and the fourth conductor row 28R4. The varnish holding members 201, 202, and 203 have a function of holding the varnish on the surface and applying the varnish widely in the stator winding 40 by guiding and flowing along the surface when applying the varnish described later. Also have.

  An example of the varnish holding members 201 and 203 is shown in FIG. The varnish holding members 201, 202, and 203 are formed in an annular shape by using, for example, a sheet-like heat-resistant polyamide material having a thickness of 0.1 mm to 0.3 mm. In the varnish holding members 201 and 203, slit-like through holes 210 are formed at predetermined intervals in the circumferential direction. The peripheral length of the varnish holding member is determined depending on the diameter between the coils to be inserted. The varnish holding member 201 ensures the insulation between the first conductor row 28R1 and the second conductor row 28R2. The varnish holding member 203 ensures the insulation between the third conductor row 28R3 and the fourth conductor row 28R4.

  In the example of FIG. 6, the coil conductor D11 is the U phase, D12 and D13 are each the W phase, the coil conductor D21 is the U phase, D22 and D23 are each the V phase, the coil conductors D31 and D32 are each the V phase, and D33 is the W phase. The coil conductors D41 and D42 are V phase, and D43 is W phase.

  The varnish holding member 202 between the varnish holding members 201 and 203 shown in FIG. 6 has a width larger than the width of the varnish holding members 201 and 203, and the through-hole 210 is opened in two steps in the axial direction. ing. The varnish holding member 202 ensures the insulation between the second conductor row 28R2 and the third conductor row 28R3. The varnish holding member 202 has a larger axial width than the varnish holding members 201 and 203, and protrudes outward in the axial direction of the coil end 62. This ensures a creepage distance as an insulating material.

  The varnish holding members 201, 202, 203 are disposed between the conductor rows when the segment conductor 28 is inserted into the slot 21S, and then the end 28E of the segment conductor 28 is welded to manufacture the stator winding 40. Is done. This prevents the varnish holding member from falling off the stator winding 40. Since the varnish holding members 201, 202, and 203 are formed of a heat resistant material, there is no risk of burning by heat due to welding.

  A method for manufacturing the above-described rotating electrical machine will be described. In this manufacturing method, the segment conductor 28 penetrates the slot 21S from one coil end 61 side and protrudes to the other coil end 62 side, and the segment conductor 28 protruding to the other coil end 62 side is provided. The second step of bending the end portion 28E, the third step of welding the bent end portions 28E of the segment conductor 28, and the varnish holding members 201 to 203 are disposed between the annular rows 28R1 to 28R4 of the coil conductor 28. And a fourth step. The fourth step is a step performed prior to the third step.

  More specifically, a substantially U-shaped segment conductor 28 is inserted into the slot 21S from the coil end 61 side. Before welding the end portions 28E of the segment conductor 28 protruding toward the coil end 62, the varnish holding member 201 is disposed between the conductor rows 28R1 and 28R2, and the varnish holding member 202 is provided between the conductor rows 28R2 and 28R3. The varnish holding member 203 is disposed between the conductor rows 28R3 and 28R4. Thereafter, the end portion 28E of the segment conductor 28 is welded.

As shown in FIG. 8, varnish application to the stator winding 40 is performed by, for example, four varnish dropping devices 120 while rotating the stator 20.
A cored bar (not shown) serving as a rotating shaft is inserted into the stator 20, and both ends of the cored bar are rotatably supported by bearings (not shown) so that the cored bar becomes horizontal. The mandrel is rotationally driven by a drive source such as a motor (not shown). The varnish dropping device 120 includes a nozzle 500 for dropping the varnish 300, and each varnish dropping device 120 drops the varnish 300 on the inner and outer circumferences of the coil ends 61 and 62, respectively.

  Before starting the varnish application, the stator winding 40 is placed on the bearings 110 and 111 after being heated to 150 degrees, which is higher than the varnish gelation temperature of 125 degrees. After the start of dripping, the varnish 300 that has permeated and diffused becomes highly viscous, gelled, and adheres to the surface of the stator winding 40.

  After that, dripping of the varnish 300 by the varnish dripping device 120 is continued, and while the varnish 300 is held and guided by the varnish holding members 201, 203, 203, gradually penetrates into the slot 21S of the stator 20, The varnish is uniformly diffused by centrifugal force through the varnish holding member.

  The varnish penetrates through the through-hole 210 and into the front and back of the varnish holding members 201, 202, 203. As a result, the varnish penetrates into the circumferential conductor rows adjacent in the radial direction, and in combination with the effect of the flow along the surface, the varnish penetrates into the entire stator winding 40, Uniform coating with varnish.

  Since the temperature of the stator gradually decreases with the passage of time, the rate of gelation of the varnish 300 decreases, but the liquid varnish adheres on the gelled varnish 300 on the surface of the stator winding 40.

  Since the varnish 300 is more likely to adhere to the gel varnish than to directly adhere to the insulating coating on the surface of the stator winding 40, the ratio of the liquid varnish adhering to the gelled varnish is determined by the stator. More than when the liquid varnish is dropped directly on the surface of the winding 40.

  That is, a varnish layer having a sufficient thickness is formed on the surface of the stator winding 40, and insulation performance and heat transfer performance are improved. Further, the coil ends 61 and 62 are firmly integrated by the varnish 300, and vibration resistance and mechanical strength are improved.

According to the rotary electric machine of 1st Embodiment demonstrated above, there can exist the following effects.
(1) In a conventional copper wire stator winding with a circular cross section, the varnish was relatively easy to penetrate due to the capillary phenomenon between copper wires, but with a quadrilateral cross section segment conductor, so-called rectangular wire coil conductor, Since the gap between the conductors is large, a portion where the varnish coating amount is insufficient is generated. However, the varnish can be uniformly adhered by the action of the varnish holding members 201, 202, and 203.

(2) In the varnish application process, the varnish is held and guided by the varnish holding members 201, 202, and 203, so that the applied varnish does not drip from the stator winding 40, such as a bearing of the varnish application device. It does not stick to the jig. Therefore, the yield of the varnish can be improved and the deterioration of the jig can be prevented. Moreover, since the filling amount of the varnish can be increased, the electrical dielectric strength can be improved.

(3) Since the through hole 210 is provided in the varnish holding member, the varnish permeates the front and back of the varnish holding members 201, 202, 203 through the through hole 210 when applying the varnish. As a result, the varnish penetrates into the circumferential conductor rows adjacent in the radial direction, and in combination with the effect of the flow along the surface, the varnish penetrates into the entire stator winding 40, It becomes possible to coat uniformly with varnish.

(4) Heat generated in the stator winding 40 is conducted to the stator core through the varnish. Since heat is more easily conducted in the varnish layer than in the air layer, the cooling efficiency of the stator is increased, and even if the rotary electric machine is downsized, the temperature rise is low, the performance is not reduced, and a long-life rotary electric machine is obtained. be able to.

The embodiment described above can be implemented by being modified as follows.
(1) The varnish holding members 201, 202, and 203 are arranged at the coil end 62. However, as shown in FIG. 3, the varnish holding members 201, 202, and 203 are similarly arranged at the coil end 61, Alternatively, the varnish holding members 201, 202, and 203 may be disposed only on the coil end 61.

(2) The varnish holding members 201, 202, and 203 are formed of the same material as the slot liner 200, and the manufacturing cost is reduced by the common use of component materials. However, the varnish holding members 201, 202, 203 and the slot liner 200 made of different materials may be used.

(3) Although the varnish holding members 201, 202, and 203 are previously annular, the belt-shaped member may be annularly wound around the coil end.

(4) You may use the varnish holding member formed circularly by winding a sheet-like insulating material 2-3 times. Or it is also possible to wind a belt-like varnish holding member 2-3 times. As a result, the radial thicknesses of the varnish holding members 201, 202, and 203 are increased, and the varnish holding members are compressed in the radial direction between the disposed coils, thereby preventing the varnish holding members from being detached from the windings.

(5) Although the slit-like through holes 210 extending in the axial direction are provided in the varnish holding members 201, 202, and 203 at predetermined intervals in the circumferential direction, circular or other through holes may be used.
(6) As shown in FIG. 9, you may form the varnish holding member 201,202,203 in the shape of a bellows bent toward the front and back. Since the varnish holding members 201, 202, and 203 are held between the coils with a resilient force in the radial direction, they are less likely to be detached from the windings when the holding members are attached. Further, it is not necessary to take measures to ensure the thickness such as winding the varnish holding members 201, 202, 203 a plurality of times.

(7) Although the stator winding using a rectangular cross-section segment conductor, so-called rectangular wire, has been described, the present invention can also be applied to a rotating electrical machine in which a circular cross-section coil conductor is wound around a stator core.

(8) As shown in FIG. 10, it is also possible to apply the varnish by inclining the rotation axis of the varnish applicator. This promotes varnish flow in the direction of the central axis.

  As described above, the above-described embodiments and modifications are examples, and the present invention is not limited to them. That is, the present invention can be applied to the following rotating electrical machines. The rotating electric machine has a stator core having a plurality of slots and a stator winding in which at least N coil conductors are inserted in one slot in the radial direction and wound around the stator core. A child and a rotor that rotates relative to the stator. Each of the N coil conductors in the plurality of slots is arranged in a ring in the circumferential direction of the stator core to form the first to Nth annular rows. In at least one of the coil ends from which the coil conductors constituting the first to N-th annular rows protrude, a varnish holding member made of an insulating material is interposed between at least one pair of the annular rows. Varnish is applied to the coil end.

DESCRIPTION OF SYMBOLS 100 Rotating electrical machine 11 Rotor 12 Rotor core 20 Stator 21 Stator core 21S Slot 40 Stator winding 61 Coil end 62 Coil end 200 Slot liner 201, 202, 203 Varnish holding member 210 Through hole

Claims (15)

A stator core having a plurality of slots, and a stator having a stator winding in which at least N coil conductors are inserted in a radial direction in a single slot and wound around the stator core;
A rotor that rotates relative to the stator,
Each of the N coil conductors in the plurality of slots is arranged in a ring in the circumferential direction of the stator core to form first to Nth annular rows,
At least one of the coil ends from which the coil conductors constituting the first to N-th annular rows protrude, a varnish holding member made of an insulating material is interposed between at least one pair of the annular rows, and the coil A rotating electric machine characterized in that a varnish is applied to an end. The rotating electrical machine according to claim 1, wherein
The rotary electric machine is characterized in that the varnish holding member is manufactured in an annular shape in advance. The rotating electrical machine according to claim 1, wherein
The rotary electric machine is characterized in that the varnish holding member is constituted by a belt-like member wound in an annular shape. The rotating electrical machine according to any one of claims 1 to 3,
The rotating electric machine is characterized in that the annular varnish holding member is formed in a bellows shape that bends in the front and back direction. The rotating electrical machine according to any one of claims 1 to 4,
The rotating electric machine is characterized in that the varnish holding member is provided with a plurality of through holes for allowing the varnish to permeate at a predetermined interval in the circumferential direction. The rotating electrical machine according to claim 5,
The rotary electric machine is characterized in that the through hole is a slit extending in an axial direction or a circular shape. The rotating electrical machine according to any one of claims 1 to 6,
When N is 4,
The plurality of coil conductors on the outermost diameter side in the plurality of slots are arranged in a ring in the circumferential direction of the stator core to form a first annular row,
The second plurality of coil conductors from the outer diameter side in the plurality of slots are arranged in parallel in the circumferential direction of the stator core to form a second annular row,
The third plurality of coil conductors from the outer diameter side in the plurality of slots are arranged in parallel in the circumferential direction of the stator core to form a third annular row,
The fourth plurality of coil conductors from the outer diameter side in the plurality of slots are arranged in parallel in the circumferential direction of the stator core to form a fourth annular row,
The varnish holding member is disposed between the first and second annular rows, between the second and third annular rows, and between the third and fourth annular rows, respectively. Rotating electric machine. The rotating electrical machine according to claim 7,
The varnish holding member disposed between the second and third annular rows has a larger width in the axial direction than the other varnish holding members and protrudes toward the shaft end side from the other varnish holding members. A rotating electric machine characterized by that. The rotating electrical machine according to any one of claims 1 to 8,
The rotating electrical machine characterized in that the stator winding is constituted by a conducting wire having a rectangular cross section. The rotating electrical machine according to claim 9,
The conducting wire is a substantially U-shaped segment conductor, and adjacent ends of a plurality of segment conductors that penetrate the slot from one coil end side and project to the other coil end are welded to each other, and the stator winding A rotating electric machine characterized by being wound as a wire. The rotating electrical machine according to claim 10,
The rotating electric machine, wherein the varnish holding member is formed of a heat-resistant material. The rotating electrical machine according to claim 10 or 11,
The rotating electric machine according to claim 1, wherein the varnish holding member is disposed on both the one coil end and the other coil end. The rotating electrical machine according to any one of claims 10 to 12,
The stator and the rotor are accommodated in a case,
The rotating shaft of the rotor is supported by the case,
The case is provided with a discharge port for dripping cooling refrigerant onto the coil end,
The rotating electrical machine, wherein the discharge port is provided at a position facing the varnish holding member. In the manufacturing method of the rotary electric machine according to any one of claims 10 to 13,
A first step of projecting the segment conductor from one coil end side to the other coil end through the slot;
A second step of bending the end portion of the segment conductor protruding to the other coil end;
A third step of welding the bent ends of the segment conductors;
And a fourth step of disposing the varnish holding member between the annular rows of the coil conductors. In the manufacturing method of the rotary electric machine of Claim 14,
The method of manufacturing a rotating electrical machine, wherein the fourth step is performed before the third step.

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