JP6638629B2 - Rotating electric machine stator - Google Patents

Description

  The present disclosure relates to a stator of a rotating electric machine, and more particularly to a stator of a rotating electric machine using a segment coil.

  In order to reduce the size and increase the output of a rotating electrical machine mounted on a vehicle, for example, Patent Literature 1 describes using a segment coil formed of a rectangular wire having a rectangular cross section as a stator winding. The segment coil has a lead portion joined to the end of another segment coil after being inserted into the stator core, a straight wire portion which is a straight portion inserted into the slot, and a substantially V-shape protruding to the opposite side of the stator from the lead. Or, it includes a coil end portion formed in a substantially U shape. The coil end portion includes a hypotenuse portion formed by bending the conductor portion in the slot at a predetermined angle and a crank portion formed for lane change between adjacent segment coils.

JP-A-2005-035866

  The oblique side of the coil end portion of the segment coil is formed by axial bending to bend the short side of the cross section of the flat wire, and the crank portion is formed by radial bending to bend the long side of the cross section of the flat wire. You. When a rotating electric machine mounted on a vehicle is reduced in size and the stator is reduced in diameter, a crank formed by radial bending is reduced in size, and interference between adjacent segment coils is likely to occur. Therefore, there is a demand for a stator of a rotating electrical machine that can suppress interference by increasing the interval between adjacent segment coils.

A stator of a rotating electrical machine according to the present disclosure includes a stator core including an annular back yoke, a plurality of teeth protruding inward from the back yoke, and a plurality of slots that are spaces between adjacent teeth, and a plurality of segment coils. and a stator winding wound around the teeth of the stator core using a segment coil cross section consists flat wire of rectangular shape, and, in the other segment coil after being inserted into the stator core slot Tei Ru lead portion is bonded to an end portion, in-slot portion a straight portion Ru Tei is inserted into the slot, and having a coil end portion that protrudes in the counter-lead side of the stator core, the coil end portion is flat displaced in the axial direction brought by bending the axial direction of bending the narrow side of the cross-sectional shape of lines extending in the circumferential direction of the stator core Two oblique portion which is not displaced in the radial direction, and includes a crank portion which is connected portions of the two oblique sides, the crank portion, the circumferential direction of the stator core by bending the radial bending the long side surface of the cross-sectional shape of the rectangular wire A central portion that is displaced in the radial direction as it extends in the axial direction but is not displaced in the axial direction, and is displaced in the radial direction as it extends from the hypotenuse side toward the central portion by the radial bending and the axial bending. Includes both sides of the central portion that is also displaced in the axial direction on the non-lead side .
In the stator of the rotating electric machine, both sides of the central portion, which is displaced in the radial direction as it extends toward the central portion and is also displaced in the axial direction toward the non-lead side, within a predetermined number of turns of the stator winding, It is preferable to be provided at the coil end portion of another winding except the innermost winding and the outermost winding.

  According to the stator of the rotary electric machine having the above configuration, the coil end portion of the segment coil constituting the stator winding has the compound bending region between the axial bending region and the radial bending region. In the composite bending region, since the axial bending is added to the radial bending, compared with the case where the bending is directly performed from the axial bending region to the radial bending region, the distance between the adjacent segment coil and the segment bending is increased by the amount of the axial bending added. , A margin is generated, and interference between adjacent segment coils can be suppressed.

  According to the stator of the rotating electric machine having the above configuration, the interval between the adjacent segment coils can be increased to suppress the interference.

FIG. 3 is a perspective view showing a stator of the rotating electric machine according to the embodiment. FIG. 5 is a diagram showing a winding of a U1 winding portion of a U1 winding portion and a U2 winding portion constituting a U-phase winding in the stator of the rotating electric machine according to the embodiment. FIG. 3 is a diagram illustrating winding of a U2 winding portion subsequent to the U1 winding portion of FIG. 2. FIG. 3 is a diagram showing a segment coil used for the stator of the rotating electric machine according to the embodiment. FIG. 4A is a front view, and FIG. 4B is a side view. FIG. 3 is a diagram showing a stator winding in a stator of the rotating electric machine according to the embodiment. FIG. 5A is a view as viewed from the non-lead side in the axial direction, and FIG. 5B is a view as viewed from the inner circumferential side in the radial direction. It is an enlarged view of the crank part of FIG.5 (b). FIG. 7 is a diagram corresponding to FIG. 6 of a related art having no composite bending region as a comparative example. FIG. 8 is a diagram showing a difference between FIG. 6 and FIG. 7.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, the on-vehicle electric machine will be described as a rotating electric machine, but this is an example of an application in which it is desired to reduce the diameter of the stator, and may be an application other than on-vehicle use.

  The shapes, dimensions, the number of teeth and slots, the number of turns of the stator winding, the material, and the like described below are examples for explanation, and can be appropriately changed in accordance with the specifications of the stator of the rotating electric machine. In the following, the same reference numerals are given to the same elements in all the drawings, and redundant description will be omitted.

  FIG. 1 is a diagram showing a configuration of a stator 10 of a rotating electric machine. Hereinafter, the stator 10 of the rotating electric machine is referred to as the stator 10 unless otherwise specified. The rotating electric machine in which the stator 10 is used is a rotating electric machine for mounting on a vehicle having a limited mounting space. For example, it is a rotating electric machine mounted on a vehicle having a radial space constraint. The rotating electric machine is a three-phase synchronous rotating electric machine that is a motor generator that functions as an electric motor when the vehicle is running power and functions as a generator when the vehicle is braking. The rotating electric machine includes the stator 10 shown in FIG. 1 and a rotor (not shown) arranged at a predetermined interval on the inner peripheral side of the stator 10.

  Stator 10 includes a stator core 12 and a stator winding 20. The stator core 12 is a magnetic component having a center hole in which the rotor is disposed, and includes an annular back yoke 14 and a plurality of teeth 16 protruding from the back yoke 14 to the inner peripheral side. The space between adjacent teeth 16 is a slot 18. In the example of FIG. 1, the number of the teeth 16 and the number of the slots 18 are the same, which is a multiple of 3, that is, 48.

  FIG. 1 shows the axial direction, the radial direction, and the circumferential direction. The axial direction is a direction along the central axis CL of the center hole, the radial direction is a radial direction passing through the central axis CL in a plane perpendicular to the axial direction, and the circumferential direction is around the central axis CL. This is a direction along the circumferential direction.

  U1, U2, V1, V2, W1, and W2 attached to the slot 18 indicate the phases of the three-phase winding inserted into the slot 18. Since each phase winding is distributedly wound by two turns, each of the turns is distinguished, so that U-phase winding is U1, U2, V-phase winding is V1, V2, and W-phase winding is In the case of a line, they are W1 and W2. Assuming that a set of six slots U1, U2, V1, V2, W1, and W2 is a slot group 19, since the total number of slots in one circumference of the stator core 12 is 48, eight slot groups 19 are formed in the circumferential direction of the stator core 12. Be placed.

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

  The stator winding 20 is a three-phase distributed winding coil, and is formed by winding one phase winding over a plurality of teeth 16. FIG. 1 shows that the windings of U1 and U2 wound around four of the eight slot groups 19 as part of the windings of the stator winding 20 are the innermost windings. The outermost winding is shown.

  Each of the phase windings is distributedly wound by two turns. In the first turn, the winding inserted in one slot 18 is spaced from the inserted slot 18 by six slots along the circumferential direction. Is inserted in the next slot 18 and returns to the first inserted slot 18 again. As a result, one coil is wound between the two slots 18 separated by an interval of six slots. This is repeated to obtain a predetermined number of turns. This is repeated eight times continuously along the circumferential direction of the stator core 12 to form a first winding. When the first winding is completed, the second winding is performed successively. The second winding is formed in the same manner as the first winding, using the slot 18 adjacent to the slot 18 into which the first winding is inserted.

  2 and 3 show a method of forming a U-phase winding. If the first and second turns of the U-phase winding are distinguished from each other and the first and second turns are called a U1 winding part and a U2 winding part, respectively, FIG. FIG. 3 is a diagram showing the winding of the U2 winding portion following the U1 winding portion. In each of the drawings, a plan view of the stator core 12 is shown at the center, and a U1 winding portion and a U2 winding portion are shown outside thereof. The numbers attached to the inner peripheral side of the stator core 12 are slot numbers. In the U1 winding section and the U2 winding section, S is added to the slot number of the slot into which the winding is inserted. For example, S1 indicates the slot 18 of the slot number 1. The C numbers in the U1 winding section and the U2 winding section are coil numbers for distinguishing windings wound with a predetermined number of turns at intervals of 6 slots. In the examples of FIGS. 2 and 3, the predetermined number of turns is five.

  In FIG. 2, the coil C1 is the beginning of the U-phase winding. The winding start terminal of the U-phase winding indicated by IN is drawn out of the stator 10 and connected to the drive circuit of the rotating electric machine.

  The coil C1 is formed in a coil shape by winding a coil wire between the slots S4 and S10 with 5 turns. The winding start is on the outer peripheral side of the stator core 12, and is wound in a coil shape from the outer peripheral side toward the inner peripheral side. Next, at the end of the winding of the coil C1, the slot S10 is separated from the slot S10 by six slots, and the coil element wire is wound between the slots S10 and S16 with the number of turns = 5 to form the coil C2. It is formed. This is sequentially repeated to form the coils C1 to C8 to form the U1 winding part. The eight slots 18 related to the U1 winding portion are slots S4, S10, S16, S22, S28, S34, S40, and S46. In FIG. 1, these slots 18 are denoted by U1.

  The end of the winding of the U1 winding portion is connected to the coil C9 of the U2 winding portion shown in FIG. At this time, the coil C9 is formed in a coil shape by being wound with the number of turns = 5 between the slots S3 and S9, shifted by one slot from the coil C1. Then, at the end of the winding of the coil C9, the slot S15 is separated from the slot S9 by six slots, and the coil element wire is wound between the slots S9 and S15 with 5 turns to form the coil C10. It is formed. This is sequentially repeated to form the coil C9 to the coil C16, thereby forming the U2 winding portion. The eight slots 18 related to the U2 winding portion are slots S3, S9, S15, S21, S27, S33, S39, and S45. In FIG. 1, these slots 18 are denoted by U2. The winding end of the coil C16 is the winding end of the U-phase winding. The ending terminal of the U-phase winding indicated by OUT is set to a neutral point when the three-phase winding is configured by Y connection, and is interconnected with the ending terminal of another phase winding.

  Thus, a U-phase winding is formed. Similarly, the V-phase winding is also formed by the V1 winding part of the first turn and the V2 winding part of the second turn, and the W-phase winding is also formed by the W1 winding part of the first turn and the W2 turn of the second turn. It is formed with a line portion. In FIG. 1, the symbols V1, V2, W1, and W2 are assigned to the slots 18 related to the V1, W2, W1, and W2 winding portions, respectively.

  Stator winding 20 is wound around teeth 16 of stator core 12 using a plurality of segment coils 30. 4A and 4B are diagrams showing the segment coil 30. FIG. 4A is a front view when a surface defined by the axial direction and the circumferential direction is the front, and FIG. 4B is a diagram showing the axial direction and the radial direction. FIG.

  The segment coil 30 is a conductor wire with an insulation coating formed by forming a rectangular wire having a rectangular cross section as a conductor wire, covering the periphery of the conductor wire excluding both ends with an insulation coating, and molding the insulation wire into a predetermined shape. FIG. 4A shows the length W of the rectangular shape, and FIG. 4B shows the length t of the rectangular shape. Here, W> t. As the insulating film, an enamel resin composed of polyamideimide or the like is used.

  The segment coil 30 has a substantially U-shaped shape. As shown in FIGS. 4A and 4B, the long side surface of the rectangular shape of the rectangular wire is a substantially U-shaped front surface, and the short side surface is the side surface. The substantially U-shaped shape is formed by edgewise bending that bends a short side surface, except for a crank portion 40 described later.

  Of the substantially U-shaped shapes, the two straight portions extending straight are the in-slot conductor portions 34 and 35 whose tips are the lead portions 32 and 33. In the substantially U-shaped shape, a portion bent and formed into a mountain shape is the coil end portion 36. The coil end portion 36 has two oblique sides 38 and 39 and a crank 40 which is a U-shaped vertex connecting the two oblique sides 38 and 39.

  The in-slot portions 34 and 35 are portions to be inserted into the slots 18 of the stator core 12. The interval between the in-slot portion 34 and the in-slot portion 35 is the length of six slots. Since each phase winding is wound in the number of turns = 5 in the radial direction, five segment coils 30 are also inserted along the radial direction of the slot 18. The stator core 12 has an annular shape, and as shown in FIG. 1, the slot interval becomes shorter toward the inner peripheral side. The interval between the in-slot conductor portion 34 and the in-slot conductor portion 35 having a length of six slots is the largest in the segment coil 30 used for the outermost winding, and is equal to the length of the segment coil 30 used for the innermost winding. It is the smallest in the segment coil used.

  The lead portions 32 and 33 are portions protruding from the lead-side end surface of the stator core 12 when the in-slot conductor portions 34 and 35 are inserted into the slots 18 of the stator core 12. FIG. 4 shows the stator core 12 in a state where the segment coil 30 is inserted by a two-dot chain line. After being inserted into the slot 18, the lead portions 32 and 33 protrude toward the lead side of the stator core 12. The protruding lead portions 32 and 33 are appropriately bent and formed outside the end face of the stator core 12 on the lead side, and are joined to the lead portions of other segment coils. FIG. 4 shows the folded state by a two-dot chain line. The state where the lead portions 32 and 33 are bent and joined to the lead portions of the other segment coils by welding or the like according to a predetermined winding method becomes the coil end 22 of the stator winding 20 on the lead side.

  The coil end portion 36 is a portion that becomes the coil end 24 of the stator winding 20 on the side opposite to the lead after the segment coil 30 is inserted into the slot 18 of the stator core 12. The coil end portion 36 includes two oblique sides 38 and 39, and a crank part 40 which is a connecting portion between the oblique sides 38 and 39.

  The hypotenuse portion 38 is a portion obtained by bending a direction extending in the axial direction of the in-slot wire portion 34 toward the in-slot wire portion 35 at a bending angle θ. The hypotenuse portion 39 is a portion obtained by bending a direction extending in the axial direction of the in-slot conductive portion 35 toward the in-slot conductive portion 34 at a bending angle θ. Each of the oblique sides 38 and 39 is formed by axial bending in which the short side surface of the flat wire is bent. The bending method of bending the short side surface of the rectangular wire is a bending method known as edgewise bending, but is a bending method in which the direction extending in the axial direction of the segment coil 30 is bent.

  The crank portion 40 is a portion where the in-slot wire portion 34 and the in-slot wire portion 35 intersect at an angle 2θ. As shown in FIG. 4B, the crank portion 40 has a semicircular shape projecting radially outward. Bendable. Although the details of the crank portion 40 will be described later, the central portion of the crank portion 40 is formed by radial bending in which the long side surface of the flat wire is bent. The bending method of bending the long side surface of the flat wire is a bending method known as flatwise bending. However, in this case, the bending method of bending the segment coil 30 in the radial direction is referred to as radial bending. The portions connected to the oblique portions 38 and 39 on both sides of the central portion of the crank portion 40 are compound bending regions in which the axial bending region and the radial bending region overlap. FIG. 5B shows that the crank portion 40 changes in the radial direction while changing in the axial direction.

  As described above, the coil end portion 36 is not a discontinuous connection in which the axial bending region and the radial bending region are directly adjacent to each other, but a composite in which the axial bending region and the radial bending region overlap. A bending area is partially included.

  The U1 winding section, U2 winding section, V1 winding section, V2 winding section, W1 winding section, and W2 winding section constituting the stator winding 20 are each wound with 5 turns. In other words, at the same radial position of each slot 18 of the stator core 12, six types of windings are wound along the circumferential direction. As shown in FIG. 1, the arrangement of the slots 18 along the circumferential direction is U1, U2, V1, V2, W1, W2. For example, in order to wind the segment coil 30 of the U1 winding section from the slot 18 of a certain U1 to the slot 18 of the next U1 at an interval of six slots, the U2 from the slot 18 of the adjacent U2 is required. It is necessary to get over the segment coil 30 of the winding part. A similar situation occurs between the segment coil 30 of the U2 winding section and the segment coil 30 of the adjacent V1 winding section.

  FIG. 5 is a diagram illustrating a mutual overriding relationship generated between the coil end portions 36 of the adjacent segment coils 30 when the segment coils 30 are inserted into the slots 18 of the stator core 12. The crossover relationship between the coil end portions 36 of the adjacent segment coils 30 can be referred to as a lane change in which a path extending along the circumferential direction of the coil end portions 36 of the respective segment coils 30 is a lane. The lane change of each segment coil 30 is performed in the crank section 40 of the coil end section 36 in each segment coil 30.

  The lane change occurs for any of the five turns, but in FIG. 5, of the five turns, 12 of the third turns, which are intermediate from both the outer side and the inner side, are used. The lane change when six segment coils 30 are arranged for the slot 18 is shown. FIG. 5A is a view as viewed from the non-lead side in the axial direction, and FIG. 5B is a view as viewed from the inner circumferential side in the radial direction. In FIG. 5B, the slots 18 of the stator core 12 are denoted by U1, U2, V1, V2, W1, and W2.

  For example, the segment coils 50 belonging to the U1 winding part are arranged between the slots 60 and 61 labeled U1 with an interval of six slots. The segment coil 51 adjacent to the segment coil 50 and belonging to the U2 winding portion is disposed between the slot 62 and the slot 63 provided with U2 at an interval of six slots. Here, when the segment coil 50 attempts to cross from the slot 60 to the slot 61, it competes with and crosses the segment coil 51 that crosses from the slot 62 to the slot 63 at the same radial position. In order to avoid the crossover, the crank portion 40 of the segment coil 50 is used. Since the crank portion 40 of the segment coil 50 is displaced to the outer peripheral side along the radial direction, the segment coil 50 passes over the segment coil 51 in the space formed by this displacement. From another perspective, the segment coil 51 passes through the segment coil 50 in the space formed by the displacement of the crank portion 40. In this way, the lane change between the segment coil 50 and the segment coil 51 is performed, and crossover due to competition between the adjacent segment coils 50 and 51 is avoided.

  Similarly, between the segment coil 51 belonging to the U2 winding section and the segment coil 52 belonging to the V1 winding section, and between the segment coil 52 belonging to the V1 winding section and the segment coil 53 belonging to the V2 winding section, respectively. The lane change is performed by using the crank portion 40 of FIG. Also, between the segment coil 53 belonging to the V2 winding section and the segment coil 54 belonging to the W1 winding section, and between the segment coil 54 belonging to the W1 winding section and the segment coil 55 belonging to the W2 winding section, respectively. The lane change is performed by using the crank portion 40 of FIG.

  The operation and effect of the above configuration, particularly the operation and effect of the crank portion 40 of the coil end portion 36, will be described in more detail with reference to FIGS.

  FIG. 6 is an enlarged view of the crank 40 of the segment coil 50 belonging to the U1 winding and the crank 40 of the segment coil 51 belonging to the U2 winding. FIG. 6 (a) is an enlarged view corresponding to FIG. 5 (a), and FIG. 6 (b) is an enlarged view corresponding to FIG. 5 (b).

  In FIG. 6, the segment coil 50 is shown on the near side of the drawing. Therefore, the segment coil 50 will be described below, but the same applies to the segment coil 51.

  In the segment coil 50, the oblique portions 38, 39 are displaced in the axial direction as shown in FIG. 6B as they extend in the circumferential direction, but are displaced in the radial direction as shown in FIG. Hardly displaces. This is because the oblique sides 38 and 39 are the axial bending regions formed by the axial bending that bends the short side surface of the flat wire.

  The crank portion 40 includes three regions: a central portion 42 of the crank portion 40 and portions 44 and 46 on both sides of the central portion 42. The portion 44 is a region between the oblique side portion 38 and the central portion 42, and the portion 46 is an area between the central portion 42 and the oblique side portion 39. The central portion 42 is hardly displaced in the axial direction as shown in FIG. 6B even if it extends in the circumferential direction. However, as shown in FIG. Large displacement. This is because the central portion 42 is a radial bending region formed by radial bending for bending the long side surface of the flat wire. As shown in FIG. 6A, the portion 44 between the central portion 42 and the oblique portion 38 is displaced in the radial direction as shown in FIG. It is also displaced in the axial direction as shown in b). Similarly, the portion 46 between the central portion 42 and the oblique portion 39 is displaced in the radial direction as shown in FIG. It is also displaced in the axial direction as shown in FIG. This is because, in the portions 44 and 46, the axial bending region following the hypotenuse portions 38 and 39 and the radial bending region following the central portion 42 overlap each other.

  FIG. 7 is a diagram corresponding to FIG. 6 for the segment coils 56 and 57 of the related art. In the conventional segment coils 56 and 57, the hypotenuse portions 38 and 39 are the same as the hypotenuse portions 38 and 39 in the segment coils 50 and 51 of FIG. 6, and are formed by bending in the axial direction to bend the short sides of the flat wire. This is an axial bending region.

  The crank portions 41 of the segment coils 56 and 57 according to the prior art, unlike the crank portions 40 of the segment coils 50 and 51 of FIG. 6, do not have a compound bending region, and all of the crank portions 41 are radial bending regions. That is, the crank portion 41 is hardly displaced in the axial direction as shown in FIG. 7B even if it extends in the circumferential direction, like the central portion 42 of the crank portion 40 in FIG. As shown in a), it is greatly displaced in the radial direction as it extends in the circumferential direction. This is because all of the crank portions 41 are radial bending regions formed by radial bending for bending the long side surface of the flat wire. Since the axial bending region does not overlap with the crank portion 41, FIG. 7B is almost the same as FIG. 6B, and the lane change viewed from the non-lead side in the axial direction is the same as that of FIG. It is almost the same as the technology, and has little effect on the outer contour of the stator 10 viewed from the axial direction.

  FIG. 8 is a diagram in which the segment coil 50 and the segment coil 56 are overlapped to compare FIGS. 6 and 7. As described above, FIG. 6A and FIG. 7A are almost the same, and only the superposition of FIG. 6B and FIG. 7B is shown.

  When the crank portion 40 and the crank portion 41 are overlapped, it is understood that the crank portion 40 is displaced more toward the non-lead side in the axial direction than the crank portion 41. This is a radial bending region and does not include an axial bending region because the portions 44 and 46 of the crank portion 40 are a composite bending region in which the axial bending region and the radial bending region overlap. This is because it is displaced axially away from the reed side of the crank portion 41. When the portions 44 and 46 are displaced in the axial direction, the central portion 42, which is a region between them, is also displaced toward the non-lead side in the axial direction as compared with the crank portion 41. Thus, the interval between the adjacent segment coils 50 and 51 can be increased in the crank 40 as compared with the case where the crank 41 of the related art is used.

  In FIG. 6, among the windings of the stator winding 20 of the number of turns = 5, the intermediate winding which is the third winding from the innermost side and the outermost side is described. As the size of the stator 10 is reduced and its radial dimension is reduced, the slot interval is also reduced, the interval between the in-slot conductors 34 and 35 of the segment coil 30 is also reduced, and the crank 40 is also reduced in size. This tendency becomes more pronounced toward the inner circumference side in the radial direction. As the crank part 40 is reduced in size, the portions 44 and 46, which are compound bending regions, become narrower, making compound bending difficult and reducing the effect of axial displacement. The application range of the segment coil 30 having the composite bending area may be determined in consideration of the number of steps and cost of the composite bending processing, the effect of avoiding interference by providing the composite bending area, and the like.

  The range of application of the segment coil 30 partially including the composite bending region to the stator 10 depends on the specifications of the stator 10, particularly, the degree of miniaturization of the stator such as the number of slots and the inner and outer diameters. As an example, except for the first or second turn from the innermost side and excluding the first turn from the outermost side, the composite bending area is defined as a winding in the intermediate range along the radial direction. It is preferable to use a segment coil 30 including the coil.

  Stator 10 of the rotating electric machine according to the present embodiment includes stator core 12 and stator winding 20. The stator core 12 includes an annular back yoke 14, a plurality of teeth 16 protruding inward from the back yoke 14, and a plurality of slots 18 that are spaces between adjacent teeth. Stator winding 20 is wound around teeth 16 of stator core 12 using a plurality of segment coils 30. The segment coil 30 is a rectangular wire having a rectangular cross section. The segment coil 30 includes lead portions 32, 33 joined to the ends of the other segment coils after being inserted into the slots 18 of the stator core 12, and in-slot conductor portions 34, 35 which are straight portions inserted into the slots 18. Have. Further, a coil end portion 36 protruding from the stator core 12 on the side opposite to the lead is provided. The coil end portion 36 includes a compound bending region in which an axial bending region for bending a short side surface of a rectangular wire cross-sectional shape and a radial bending region for bending a long side surface are overlapped.

  The coil end portion 36 includes oblique sides 38 and 39, and a crank 40 between the oblique sides 38 and 39. The hypotenuse portions 38 and 39 are formed by bending the short side of the cross section of the flat wire in the axial direction. The crank portion 40 includes a central portion 42, a portion 44 between the hypotenuse portion 38 and the central portion 42, and a portion 46 between the central portion 42 and the hypotenuse portion 39. The central portion 42 is formed by radial bending in which a long side surface of a cross section of a rectangular wire is bent. Portions 44 and 46 are compound bending areas where the axial bending area and the radial bending area overlap. The crank section 40 is displaced not only in the radial direction but also in the axial direction by the composite bending area, so that the interval between adjacent segment coils can be increased as compared with the case where the composite bending area is not included. . As a result, there is a margin between adjacent segment coils, and interference between adjacent segment coils can be suppressed.

  Reference Signs List 10 stator (of rotating electric machine), 12 stator core, 14 back yoke, 16 teeth, 18, 60, 61, 62, 63 slots, 19 slots group, 20 stator winding, 22 coil end on lead side, 24 coil end on opposite lead side Coil end, 30, 50, 51, 52, 53, 54, 55, 56, 57 Segment coil, 32, 33 Lead, 34, 35 In-slot conductor, 36 Coil end, 38, 39 Oblique, 40, 41 Crank part, 42 central part, 44, 46 part.

Claims (2)

An annular back yoke, a plurality of teeth protruding inward from the back yoke, and a stator core including a plurality of slots that are spaces between the adjacent teeth;
A stator winding wound around the teeth of the stator core using a plurality of segment coils,
With
The segment coil,
Cross-section consists of flat wire of rectangular shape, and,
The Empire Ru lead portion is bonded to an end portion of the other of the segment coil after insertion into the slot, in-slot portion is Tei Ru straight portion is inserted into the slot of the stator core, and the anti-lead side of the stator core a coil end portion that protrudes,
The coil end portion is
Two hypotenuse portions that are displaced in the axial direction as they extend in the circumferential direction of the stator core but are not displaced in the radial direction by axial bending that bends a short side surface of the cross-sectional shape of the rectangular wire , and the two hypotenuse portions Including the crank part which is the connection part of
The crank portion,
A central portion that is displaced in the radial direction as it extends in the circumferential direction of the stator core but is not displaced in the axial direction by radial bending that bends the long side surface of the cross-sectional shape of the rectangular wire , and the radial bending and the shaft A stator of the rotating electric machine, including a portion on both sides of the central portion which is displaced in the radial direction as it extends from the oblique side portion toward the central portion by bending in the direction and is also displaced in the axial direction toward the non-lead side. . The portions on both sides of the central portion, which are displaced in the radial direction as they extend toward the central portion and are also displaced in the axial direction toward the non-lead side,
2. The stator of the rotating electric machine according to claim 1, wherein the stator is provided on the coil end portion of the winding other than the innermost winding and the outermost winding of the predetermined number of turns of the stator winding. 3.

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