JP2021097499A - Stator of rotary electric machine - Google Patents

Abstract

To provide a stator of a rotary electric machine capable of suppressing an increase of connection resistance in a connection of segment coils while using connecting members capable of omitting welding.SOLUTION: A stator 10 of a rotary electric machine includes a stator core 12 and a stator coil 20 wound on the stator core 12. The stator coil 20 includes multiple segment coils 30 that have fitting concavities on both ends with the material surface exposed; and conductive connecting pins 60a, 60b, one end of which is fitted to the fitting concavity of one segment coil, and the other end of which is fitted to the fitting concavity of the other segment coil.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a stator of a rotary electric machine, and more particularly to a stator of a rotary electric machine having a stator coil wound by using a segment coil.

In the stator of a rotary electric machine, a stator coil is wound around the stator core. As the stator coil, there is one in which a plurality of segment coils are connected and wound. For example, a substantially U-shaped segment coil is inserted into the slot from the axial end face side on one side of the stator core and assembled, and the end portion of the segment coil protruding from the axial end face on the other side of the stator core is tilted in the circumferential direction. Bend. Then, the end of the bent segment coil is welded to the end of another similarly bent segment coil, the plurality of segment coils are connected, and the coil is wound around the stator core. Here, after assembling the segment coil to the stator core, bending and welding of the segment coil, insulation treatment of the welded portion, and the like are required.

In Patent Document 1, as a stator of a rotary electric machine and a method for manufacturing the same, a connecting member having fitting recesses at both ends is used, and the tip of a segment coil is provided in the fitting recess on one end and the fitting recess on the other side, respectively. It is disclosed to fit. This technique eliminates the need for welding related to segment coils, insulation treatment of welded parts, and the like.

Japanese Unexamined Patent Publication No. 2019-126153

In the technique of fitting the tip of the segment coil into the fitting recess on one end and the fitting recess on the other side by using a connecting member having fitting recesses at both ends, the connecting member is fitted at the time of fitting. Deformation that expands on both ends occurs. As a result, the contact area at the contact portion between the inner surface of the recess of the fitting recess and the tip of the segment coil is reduced, the connection resistance in connection is increased, and the connection quality is deteriorated. Therefore, in connecting segment coils, there is a demand for a stator of a rotary electric machine that can suppress an increase in connection resistance in connection while using a connection member that can omit welding.

The stator of a rotary electric machine according to the present disclosure is a stator of a rotary electric machine having a stator core and a stator coil wound around the stator core, and the stator coil has fitting recesses at both ends in a state where the material surface is exposed. A plurality of segment coils held in the portion, and a conductive connecting pin in which one end is fitted in the fitting recess of one segment coil and the other end is fitted in the fitting recess of the other segment coil. Be prepared.

According to the stator of the rotary electric machine having the above configuration, in the connection of the segment coils, it is possible to suppress an increase in connection resistance in the connection while using a connection member that can omit welding.

It is an exploded perspective view about the connection between a stator core and three segment coils assembled to the stator of the rotary electric machine which concerns on embodiment. FIG. 1 is an enlarged view of three segment coils and two conductive connecting pins extracted. FIG. 2 is a diagram showing a connection state between the fitting recesses of the two tip portions of the segment coil and the conductive connecting pin. It is a figure which shows the state which the conductive connecting pin is not connected yet about the example of another fitting recess. Following FIG. 4, it is a figure which shows the connection state of another fitting recess and a conductive connecting pin. It is a figure which shows the example of the connection method different from FIG. 1 about the connection method of a segment coil and a conductive connection pin. It is a figure which shows the example of the connection method different from FIG. 1 and FIG. It is a figure which shows the example of the connection method different from FIG. 1, FIG. 6, and FIG. It is a figure which shows the example of the connection method different from FIG. 1, FIG. 6 to FIG. As a comparative example, it is sectional drawing which shows the state before connection at the time of connecting a segment coil by using the pipe type connecting member of the prior art. It is sectional drawing when the press-fitting fit progresses according to design from the state of FIG. It is a figure which shows the case where the pipe type connecting member is deformed by the press-fitting from the state of FIG.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. In the following, the rotary electric machine will be described for mounting on a vehicle, but this is an example for explanation and may be used for purposes other than mounting on a vehicle.

The shapes, materials, the number of slots of the stator, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the stator of the rotary electric machine. In the following, similar elements will be designated by the same reference numerals in all drawings, and duplicate description will be omitted.

FIG. 1 is a perspective view of a stator 10 of a rotary electric machine. Hereinafter, unless otherwise specified, the stator 10 of a rotary electric machine is referred to as a stator 10. The rotary electric machine in which the stator 10 is used is a rotary electric machine mounted on an electric vehicle. The rotary electric machine is a motor generator that functions as an electric motor when the electric vehicle is power running and as a generator when the electric vehicle is braking, and is a three-phase synchronous type rotary electric machine. The rotary electric machine is composed of a stator 10 shown in FIG. 1 and a rotor arranged on the inner peripheral side of the stator 10 at a predetermined interval. In FIG. 1, the rotor is not shown. The stator 10 includes a stator core 12 and a stator coil 20.

FIG. 1 shows the axial direction, the radial direction, and the circumferential direction. The axial direction is along the central axis of the center hole of the stator core 12, and the direction in which the power line lead is pulled out in the stator coil 20 is the lead side, and the opposite side is the anti-lead side. The circumferential direction is a direction along the circumferential direction with the central axis as the center. The radial direction is a radial direction passing through the central axis in a plane perpendicular to the axial direction, the direction toward the central axis is the inner diameter side, and the direction away from the central axis is the outer diameter side.

The stator core 12 is a magnetic component having a central hole in which a rotor is arranged, and includes an annular back yoke 14 and a plurality of teeth 16 protruding inward from the back yoke 14. The space between adjacent teeth 16 is slot 18. The number of teeth 16 and the number of slots 18 are the same, and when the stator coil 20 is a three-phase winding, the number of teeth 16 and the number of slots 18 are both multiples of 3.

The stator core 12 is a laminated body including a back yoke 14 and teeth 16 and in which a predetermined number of annular magnetic thin plates formed into a predetermined shape so as to form a slot 18 are stacked in the axial direction. Both sides of the magnetic sheet are electrically insulated. As the material of the magnetic thin plate, an electromagnetic steel plate, which is a kind of silicon steel plate, can be used. Instead of the laminated body of the magnetic thin plates, the stator core 12 may be formed by integrally molding the magnetic powder.

The stator coil 20 is a three-phase distributed winding coil, and is formed by winding one phase winding over a plurality of teeth 16 one turn at a time. This is an example for explanation, and depending on the specifications of the stator 10, it may be a concentrated winding instead of a distributed winding. In the distributed winding, two turns may be distributed for each phase winding.

In the example of FIG. 1, since each phase winding is distributed and wound once, the U-phase winding, the V-phase winding, and the W-phase winding are wound as a set along the circumferential direction of the stator core 12. It is turned.

The stator coil 20 is wound around the teeth 16 of the stator core 12 by using a plurality of segment coils 30. In FIG. 1, as a part of the segment coil 30 for U winding arranged in _{two slots 18 L} and 18 _R separated by three slots, the coil is wound in a plurality of turns across the _{two slots 18 L} and 18 _R. The part corresponding to one turn of the smallest unit is shown as an exploded view. The two slots 18 _L and 18 _R are distinguished by adding an L subscript on the left side and an R subscript on the right side when viewed from the outer diameter side of the stator core 12.

One turn spanning the two slots 18 _L and 18 _R is composed of two first segment coils 32, one second segment coil 34, and two conductive connecting pins 60. The two first segment coils 32 are distinguished and referred to as first segment coils 32a and 32b, and the two conductive connecting pins 60 are distinguished and referred to as conductive connecting pins 60a and 60b. To distinguish the subscripts a and b attached to the first segment coils 32a and 32b and the conductive connecting pins 60a and 60b, a is attached to the side arranged on the outer diameter side in the same slot 18 and arranged on the inner diameter side. Add b to the person who is to be. FIG. 2 is an enlarged view showing two first segment coils 32a and 32b, one second segment coil 34, and two conductive connecting pins 60a and 60b.

The first segment coils 32a and 32b are conductor wires with an insulating film formed into a predetermined shape by coating a flat wire having a rectangular cross section as a conductor wire 36 and covering the conductor wire 36 with an insulating film 38. ..

As the conductor strand 36 of the conductor wire with an insulating film, a copper wire, a copper-tin alloy wire, a silver-plated copper-tin alloy wire, or the like is used. As the insulating film 38, a polyamide-imide enamel film is used. The first segment coils 32a and 32b have a substantially U-shaped shape. As shown in FIG. 2, the long side surface side of the rectangular cross section of the flat line is a substantially U-shaped front surface, and the short side surface side is a side surface. The substantially U-shaped shape is formed by edgewise bending that bends the short side surface.

The first segment coils 32a and 32b having a substantially U-shaped shape have two parallel legs 40 _L and 40 _R having straight portions at both ends in the axial direction and one ends of the legs 40 _L and 40 _R. It has a bent-shaped turn portion 42 to be connected. The legs 40 _L and 40 _R are portions to be inserted into the _{two slots 18 L} and 18 _R of the stator core 12, respectively. The distance between the two parallel legs 40 _L and 40 _R is the length of three slots. Assuming that the interval for one slot is ds, the interval between the two parallel legs 40 _L and 40 _R is 3 ds. The turn portion 42 is a portion of the stator coil 20 that forms the coil end on the opposite lead side, and the bent shape of the turn portion 42 is a bend along the circumferential direction of the stator core 12, but is not a partial arc shape but a straight line. It can be bent into a shape.

The conductor strands 36 are exposed on the tip surfaces of the legs 40 _L and 40 _R , but the outer peripheral surfaces of the other first segment coils 32a and 32b are covered with the insulating film 38.

The second segment coil 34 is a conductor wire with an insulating film formed into a predetermined substantially chevron shape by coating a insulating film 38 around the conductor wire 36 with a round wire having a circular cross section as the conductor wire 36. The second segment coil 34 is a portion of the stator coil 20 that forms the coil end on the lead side, does not have a portion to be inserted into the slot 18, and is bent not only in the circumferential direction but also in the radial direction of the stator core 12. .. The reason why the cross section of the second segment coil 34 is a circular round wire is to facilitate a complex bending process including the circumferential direction and the radial direction of the second segment coil 34.

The second segment coil 34 has a composite bending portion 44 including circumferential bending and radial bending, and both ends of the composite bending portion 44 on the lead sides _{of the legs 40 L} and 40 _{R of the first segment coils 32a and 32b, respectively. It has connecting ends 46 L} and 46 _R that connect to the side of the end face. The connection end portions 46 _L and 46 _R are bent from both ends in the circumferential direction of the composite bending portion 44 to the opposite lead side, respectively, and extend to a length necessary for connection.

The materials of the conductor wire 36 and the insulating film 38 in the second segment coil 34 may be the same as those of the first segment coils 32a and 32b, but may be different depending on the case. Since the second segment coil 34 is a round wire having a circular cross section, it is easier to bend in any direction than a flat wire having a rectangular cross section, and the insulating film 38 is less damaged by the bending process. Therefore, the thickness of the insulating film 38 of the second segment coil 34 using the round wire can be made thinner than the thickness of the insulating film 38 of the first segment coils 32a and 32b using the flat wire.

The conductor strands 36 are exposed on the tip surfaces of the connection ends 46 _L and 46 _R of the second segment coil 34, but the outer peripheral surface of the other second segment coil 34 is covered with the insulating film 38.

A fitting recess 50 is provided on the tip surface of _{the legs 40 L} and 40 _R of the first segment coils 32a and 32b where the conductor wire 36 is exposed. The fitting recess 50 is a recess for fitting the ends of the conductive connecting pins 60a and 60b on the anti-lead side, and is a circular shape having an upper recess with the front end surface side _{of the legs 40 L} and 40 _{R as the upper side.} It is a bottomed hole. The fitting recess 50 is provided in the portion of the conductor wire 36 so as not to hang on the portion of the insulating film 38 in the _{legs 40 L} and 40 _{R, and the inner wall surface thereof is an exposed surface of the conductor wire 36.} ..

Since there are four tip surfaces on the legs 40 _L and 40 _{R where} the conductor wire 36 is exposed, these are distinguished and referred to as fitting recesses 50 _aL , 50 _aR , 50 _bL , 50 _bR . The subscripts a and b have the same meaning as the subscripts a and b of the first segment coils 32a and 32b, and the subscripts L and R have the same meaning as the subscripts L and R of the legs 40 _L and 40 _R. is there. For example, the fitting recess 50 _aL is a fitting recess 50 provided on the tip surface of _{the leg portion 40 L} of the first segment coil 32a where the conductor wire 36 is exposed. The same is true for others.

The opening edges of the fitting recesses 50 _aL , 50 _aR , 50 _bL , 50 _bR are sloped to guide the fitting. The circular bottomed holes of the fitting recesses 50 _aL , 50 _aR , 50 _bL , and 50 _bR each have the same inner diameter and the same hole depth.

A fitting recess 52 is provided on the tip surface of _{the connecting ends 46 L} and 46 _R of the second segment coil 34 where the conductor wire 36 is exposed. The fitting recess 52 is a recess for fitting the lead-side ends of the conductive connecting pins 60a and 60b by press fitting, and has a circular lower recess with the tip surface side _{of the connecting ends 46 L} and 46 _{R as the lower side.} It is a bottomed hole. The fitting recess 50 is provided in the portion of the conductor wire 36 so as not to hang on the portion of the insulating film 38 at the connection end portions 46 _L and 46 _{R, and the inner wall surface thereof is the exposed surface of the conductor wire 36.} is there. Since the second segment coil 34 has two connection ends 46 _L and 46 _R, there are also two fitting recesses 52. By distinguishing two fitting recesses 52, the connection end portion is referred to those who conductor wire 36 is provided on the front end surface exposed to the fitting recess 52 _L in 46 _L, conductor wire 36 is exposed at the connection end portion 46 _R The side provided on the tip surface is called the _{fitting recess 52 R.}

The opening edges of the fitting recesses 52 _L and 52 _R are sloped so as to guide the fitting. In order to standardize the processing, _{each of the circular bottomed holes of the fitting recesses 52 L} and 52 _R has the same inner diameter and the same hole depth. The inner diameter of the fitting recess 52 in the second segment coil 34 is set to be the same as the inner diameter of the fitting recess 50 in the first segment coil 32. The hole depth of the fitting recess 52 in the second segment coil 34 is set to be the same as the hole depth of the fitting recess 50 of the first segment coil 32, but is different from the hole depth of the fitting recess 50 in some cases. It may be set to the hole depth.

The conductive connecting pins 60a and 60b are connected to connect the two first segment coils 32 and one second segment coil 34 to form a one- _{turn stator coil 20 straddling the slots 18 L} and 18 _R. It is a member. The conductive connecting pins 60a and 60b have the same outer shape as each other in order to standardize the parts. As the conductive connecting pins 60a and 60b, those obtained by molding a conductive material into a cylindrical shape having a predetermined outer diameter and a predetermined length are used. As the conductive connecting pins 60a and 60b, those obtained by cutting a metal wire having a predetermined outer diameter to a predetermined length can be used. The cut surface may be a flat surface, but it is preferable to give an appropriate roundness to the tip surface so as to guide the fitting.

As a method of connecting the two first segment coils 32 and the one second segment coil 34, a fitting method is used instead of a welding method or the like. That is, in the conductive connecting pin 60a, the tip end on the anti-lead side _{is fitted with the fitting recess 50 aL} of the first segment coil 32a, and the tip on the lead side is fitted with the fitting recess 52 _{L of the second segment coil 34.} Fit. Further, in the conductive connecting pin 60b, the tip portion on the anti-lead side _{is fitted with the fitting recess 50 bR} of the first segment coil 32b, and the tip portion on the lead side is fitted with the fitting recess 52 _{R of the second segment coil 34.} Fit.

In order to use the fitting method, the predetermined outer diameters of the conductive connecting pins 60a and 60b are the same as the predetermined inner diameters of the fitting recess 50 of the first segment coil 32 and the fitting recess 52 of the second segment coil 34. Set slightly larger. Conversely, the predetermined inner diameters of the fitting recess 50 of the first segment coil 32 and the fitting recess 52 of the second segment coil 34 are the same as or slightly smaller than the predetermined outer diameters of the conductive connecting pins 60a and 60b. Set small.

As the material of the conductive connecting pins 60a and 60b, when they are fitted into the fitting recesses 50 and 52, they are deformed according to the circular bottomed hole shape of the fitting recesses 50 and 52, and the fitting recesses 50 and 52 are deformed. It is preferable that the conductor wire 36 is in close contact with the exposed surface. As such a material, a soft metal is preferable. As the soft metal, copper, a copper alloy, or the like is used.

In the case of FIGS. 1 and 2, the fitting recess 50 _{aL of the left leg 40 L} of the first segment coil 32a and the fitting recess 52 _{L of the connection end 46 L} on the left side of the second segment coil 34. Are fitted and electromechanically integrated. Then, a fitting recess 52 _R of the right connection end 46 _R of the second segment coil 34, the right leg 40 _R fitting recess _{50 bR} and is fitted with electrical machines of the first segment coil 32b To be integrated. As a result, the stator coil 20 is wound once between _{the slot 18 L} and the slot 18 _R. That is, the leg portion 40 _R of the first segment coil 32a in the slot 18 _R, the first segment coil 32a, the second segment coil 34, through the first segment coil 32b, the leg portion of the first segment coil 32b of the slot 18 _L It is rolled up to 40 _L.

FIG. 3 is an example of a cross-sectional view in which the first segment coil 32 and the second segment coil 34 are electrically and mechanically connected by a conductive connecting pin 60 which is a connecting member. Here, the fitting recess 50 _{aL of the first segment coil 32a and the fitting recess 52 L} of the second segment coil 34 are connected by the conductive connecting pin 60a.

Before being press-fitted into the fitting recess 50 _aL and the fitting recess 52 _L , the predetermined outer diameter of the conductive connecting pin 60a is the same as or slightly _larger than the predetermined inner diameter of the fitting recess 50 aL and the fitting recess 52 _L. Although it is large, when it is press-fitted, it plastically deforms following the shapes of _{the fitting recess 50 aL} and the fitting recess 52 _L. As a result, the outer peripheral surface of the conductive connecting pin 60a is brought into close contact with the conductor wire 36 exposed on the inner wall _{surface of the fitting recess 50 aL} and the fitting recess 52 _{L, and the entire contact surface becomes an electrical contact surface.}

In FIG. 3, _{the hole bottom shapes of the fitting recess 50 aL} and the fitting recess 52 _L are circular with a predetermined inner diameter, but in FIGS. 4 and 5, the hole bottom shapes _{of the fitting recess 50 aL} and the fitting recess 52 _{L are shown.} Is a cross-sectional view showing an example in which the inner diameter of the bottom end of the hole is wider than a predetermined inner diameter. Such a hole bottom expanding shape can be obtained by hydroforming (bulge forming) technology or the like.

FIG. 4 is a diagram showing a state before the conductive connecting pin 60a is press-fitted into the _{fitting recess 50 aL} having the expanding portion 54 on the bottom side of the hole in the first segment coil 32a. FIG. 5 proceeds from FIG. 4, _{and press-fits the end} of the conductive connecting pin 60a on the non-lead side into the fitting recess 50 aL, and then inserts the end of the conductive connecting pin 60a on the lead side into the bottom of the hole. It is a figure of the state which press-fitted into the 2nd segment coil 34 which formed the _{fitting recess 52 L} which has the spread part 54 on the side. The anti-lead side and the tip portion of the lead side of the conductive connecting pin 60a are plastically deformed according to the shape of the expanding portion 54, _{and are difficult to come off from the fitting recess 50 aL} and the fitting recess 52 _L, so that the connecting strength is improved. .. The adhesion area of that deformed along the shape of the expanded portion 54, and the outer peripheral surface of the conductive connecting pin 60a, the conductor wire 36 which is exposed to the inner wall surface of the fitting recess 50 _aL and the fitting recesses 52 _L Increases and the connection resistance in connection decreases.

In the above, the cross-sectional shape of the conductive connecting pin 60 is circular, and correspondingly, the hole shapes of the fitting recesses 50 and 52 are also circular, but this is an example for explanation and is not circular. The shape may be, for example, an elliptical shape, a square shape, a polygonal shape, or the like.

Further, in the above, the first segment coil 32 constituting the segment coil 30 has a substantially U shape and the second segment coil 34 has a substantially chevron shape. However, the configuration of the segment coil 30 is appropriately determined according to the specifications of the stator 10. It can be changed. 6 to 9 are diagrams showing examples of variations in the configuration of the segment coil 30.

In FIG. 6, the first segment coil 32 is two linear first segment coils 70a and 70b having only a portion accommodated in the slot 18. Then, the substantially chevron-shaped second segment coils 34a and 34b are arranged on the anti-lead side and the lead side of the first segment coil 32, respectively. The two first segment coils 70a and 70b and the two second segment coils 34a and 34b are connected by four conductive connecting pins 72a, 72b, 72c and 72d. In such a configuration, the portion of the stator coil 20 housed in the slot 18 can be formed by a flat wire, and the portion that becomes the coil end can be formed by a round wire. As a result, the coil end can be easily formed (bent) while improving the space factor in the slot 18.

FIG. 7 shows a configuration in which the segment coil 30 is formed into two substantially U-shaped first segment coils 74a and 74b, and these are connected by two conductive connecting pins 72a and 72b. In such a configuration, the two first segment coils 74a and 74b are fitted into the two conductive connecting pins 72a and 72b in the slot 18. In this case, in order to facilitate the fitting operation, it is desirable that the stator core 12 is a divided core divided into two in the axial direction.

FIG. 8 shows a configuration in which the segment coil 30 is formed into two substantially J-shaped first segment coils 76a and 76b, and these are connected by two conductive connecting pins 72a and 72b. The substantially J-shape is a shape in which a vertical line portion accommodated in the slot 18 is connected to one end of a substantially chevron-shaped horizontal line portion.

Further, all of the segment coils 30 described so far are connected inside the slot 18 or near the axial end portion of the slot 18. In other words, the portion of the segment coil 30 corresponding to the coil end extends from one slot 18 to the other slot 18 without interruption on the axially outer side of the stator core 12. With such a configuration, the height of the coil end can be reduced and the stator 10 can be miniaturized.

In some cases, as shown in FIG. 9, the segment coils 30 may be connected to each other in the middle of the coil end. With such a configuration, the conductive connecting pin 60 is present in the middle of the coil end, and the heat dissipation of the coil end is improved.

In the above, the cross-sectional shape of the conductor wire 36 is changed between the first segment coil 32, 70a, 70b, 74a, 74b, 76a, 76b and the second segment coil 34. The conductor wire 36 may be used. By aligning the cross-sectional shapes of the conductor strands 36 for the first segment coil 32 and the like and the second segment coil 34, the coil material can be standardized and the material cost can be reduced.

The action and effect of the stator 10 including the stator coil 20 using the conductive connecting pins 60, 72a, 72b, 72c, 72d having the above configuration will be further described as compared with the case of using the pipe type connecting member of the prior art. 10 to 12 are cross-sectional views of a connecting portion in the case where two segment coils 82 and 84 are connected by using the pipe type connecting member 80 of the prior art.

FIG. 10 is a diagram showing a state before connection of the pipe type connecting member 80 and the two segment coils 82 and 84. The pipe-type connecting member 80 is a pipe component made of a conductive material. In the segment coils 82 and 84, the outer peripheral surface of the conductor wire 36 is covered with the insulating film 38, but the insulating film 38 is peeled off from the connecting portion to expose the conductor wire 36. The diameter d0 of the conductor strands 36 of the segment coils 82 and 84 is the same as or slightly larger than the inner diameter D0 of the pipe-type connecting member 80.

FIG. 11 is a diagram showing a state in which the tip ends of the conductor strands 36 of the two segment coils 82 and 84 are press-fitted into the inner diameter of the pipe-type connecting member 80, and when the press-fitting and fitting proceed as designed. , This is the state. Actually, there are variations in the dimensional accuracy of each element, the press-fitting process, etc., and as shown in FIG. 12, when the two segment coils 82 and 84 are press-fitted from the openings on both sides of the pipe-type connecting member 80, the pipe-type The connecting member 80 is plastically deformed. As a result, the connecting member 81 may be widened in the vicinity of the openings on both sides. In this case, since the connecting member 81 and the segment coils 82 and 84 are not in electromechanical contact in the vicinity of the widened openings on both sides, the contact area is reduced and the connecting strength is increased as compared with the design state of FIG. As it decreases, the connection resistance in the connection increases. In order to suppress the state of FIG. 12, it is necessary to strictly control the dimensions of D0 and d0 for fitting, the press-fitting depth, and the like.

On the other hand, in the fitting using the conductive connecting pin 60 or the like, as shown in FIGS. 3 and 4, the press-fitting direction with respect to the fitting recesses 50 and 52 is one direction, and it is possible to push the fitting recesses to the bottom surface of the recesses. , The vicinity of the openings of the fitting recesses 50 and 52 is rather closed. As a result, the segment coil 30 and the conductive connecting pin 60 or the like come into contact with each other over a wide area, the connection resistance in the connection is reduced, the connection strength is increased, and the connection quality is improved.

Further, since the press-fitting into the fitting recesses 50 and 52 such as the conductive connecting pin 60 can be pushed to the bottom surface of the recesses, the press-fitting depth can be loosely controlled. Further, the conductive connecting pin 60 or the like, which is a simple rod material, can reduce the processing cost as compared with the pipe type connecting member 80. Further, when the pipe type connecting member 80 is used, it is necessary to peel off the insulating film 38 on the outer peripheral surface of the tip portions of the segment coils 82 and 84. On the other hand, when the conductive connecting pin 60 or the like is used, since the end surface where the conductor wire 36 at the tip of the segment coil 30 is exposed is used, it is not necessary to peel off the insulating film 38 on the outer peripheral surface of the segment coil 30. Further, when the pipe type connecting member 80 is used, since the pipe type connecting member 80 is exposed in the connecting portion while remaining conductive, the pipe type connecting member 80 is connected in order to prevent electrical contact with the other connecting member 80. It is preferable to insulate and protect the outer peripheral surface of the member 80. On the other hand, when the conductive connecting pin 60 is used, as shown in FIGS. 3 and 4, the exposed portion of the conductor wire 36 in the connecting portion is small, and even if there is, it is larger than the insulating film 38 of the segment coil 30. Located inside. Therefore, almost no electrical contact with the other conductive connecting pins 60 occurs.

As described above, according to the stator 10 of the rotary electric machine having the above configuration, in the connection of the segment coil 30, it is possible to suppress an increase in connection resistance in the connection while using the conductive connection pin 60 as a connection member that can omit welding. .. Further, as compared with the case of using the pipe type connecting member 80, the cost including the man-hours is reduced.

10 (Rotary machine) stator, 12 stator core, 14 back yoke, 16 teeth, 18, 18 _L , 18 _R slot, 20 stator coil, 30, 82, 84 segment coil, 32, 32a, 32b, 70a, 70b, 74a , 74b, 76a, 76b 1st segment coil, 34, 34a, 34b, 54 2nd segment coil, 36 conductor wire, 38 insulation film, 40 _L , 40 _R legs, 42 turns, 44 composite bends, 46 _L , 46 _R Connection end, 50, 50 _aL , 50 _aR , 50 _bL , 50 _bR , 52, 52 _L , 52 _R Fitting recess, 54 Spread, 60, 60a, 60b, 72a, 72b, 72c, 72d Conductive connecting pin (connecting member), 80,81 pipe type connecting member.

Claims (1)

A stator of a rotary electric machine having a stator core and a stator coil wound around the stator core.
The stator coil is
A plurality of segment coils having fitting recesses at both ends with the material surface exposed,
A conductive connecting pin having one end fitted in the fitting recess of one segment coil and the other end fitting in the fitting recess of the other segment coil.
A stator of a rotary electric machine characterized by being provided with.

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