JP4631631B2 - Stator coil of rotating electrical machine - Google Patents

Description

  The present invention relates to a stator coil of a rotating electrical machine having a U-shaped conductor sequential connection type coil.

  A U-conductor sequential connection type coil has been proposed and put to practical use as a stator coil of a rotating electrical machine such as an AC generator for a vehicle. The following Patent Documents 1 to 21 are part of a U-shaped conductor sequential connection type coil filed by the present applicant. This U-shaped conductor sequential connection type coil individually inserts a pair of leg portions of the U-shaped conductor into a slot separated from the one end surface side of the stator core by approximately one magnetic pole pitch, and for each phase on the other end surface side of the stator core. Configured in series connection.

  The U-shaped conductor includes a U-shaped head tip portion, a pair of head skew portions individually extending from both ends of the head tip portion, and a pair of head skew portions extending from the pair of head skew portions. A pair of slot conductor portions individually accommodated in the slot, a pair of end skew portions extending individually from the pair of slot conductor portions, and a distal end portion of the end skew portion, and another U It consists of the edge part front-end | tip part (joining part) joined to the front-end | tip part of the edge part skew part of a character conductor.

  The head tip portion and the head skew portion constitute a head-side coil end, and the head skew portion and the end tip portion constitute an end-side coil end. The slot conductor portion, the head skew portion, and the end tip portion constitute a leg portion. Each slot has an even number of conductor receiving positions in the radial direction. A pair of slot conductor portions of each U-shaped conductor are accommodated in different conductor accommodation positions. The slot conductor portions of the pair of U-shaped conductors whose end tips are joined to each other are housed in different housing positions. In order to separate the pair of slot conductor portions of one U-shaped conductor by approximately one magnetic pole pitch, the head skew portion and the head skew portion of the U-shaped conductor are bent in the circumferential direction. In a typical manufacturing method, each head skew portion and head skew portion are skewed in the circumferential direction by substantially a semi-magnetic pole pitch.

  In order to develop the head skew portion of the U-shaped conductor in the circumferential direction, the head skew portion of the undeveloped U-shaped conductor formed in a pine needle shape is relatively twisted by one magnetic pole pitch. In the circumferential twisting (expansion) of the pair of head skew portions of the U-shaped conductor, the slot conductor portion planned portions of the U-shaped conductor are held by a pair of rings (also referred to as a rotating ring or a twisting ring). On the other hand, this pair of rings is realized by relative rotation of one magnetic pole pitch. More specifically, a pair of head skew portions of the U-shaped conductor are developed in the circumferential direction by rotating relative to each other while holding the slot conductor portion of the pine needle-shaped undeveloped U-shaped conductor. A head unfolding step that is performed with the skew portion is executed.

  Similarly, in order to expand the end skew portion of the U-shaped conductor in the circumferential direction, after inserting the slot conductor portion of the U-shaped conductor in which the head skew portion is expanded into the slot of the stator core, the end skew After the portion of the portion is inserted into the slot of the stator core, the pair of the end inclined portions are preliminarily rotated by rotating the pair of rings relative to each other by one magnetic pole pitch while holding the end portion of the end portion of the portion by the pair of rings. An end unfolding step is performed in which the end is skewed (deployed) to form an end skew portion. A typical coil twisting device and its operation are disclosed in, for example, Patent Literature 2, Patent Literature 20, and Patent Literature 21 below.

  The tip portions of the pair of end portions of one U-shaped conductor are individually accommodated in two different conductor accommodating positions. Two U-shaped conductors are connected in series by joining an end tip of one U-shaped conductor and an end tip of the other U-shaped conductor adjacent to the end tip in the radial direction. Is called. In one example, one U-shaped conductor sequential connection type coil can be configured using two conductor receiving positions adjacent to each other in the circumferential direction of each slot. This is referred to as a two-position U-shaped conductor sequential connection type coil. In another example, one U-shaped conductor sequential connection type coil can be configured using four conductor receiving positions adjacent to each other in the circumferential direction of each slot. This is referred to as a 4-position U-shaped conductor sequential connection type coil. The 4-position U-shaped conductor sequential connection type coil includes a large segment in which a pair of legs are individually accommodated in a radially innermost conductor accommodating position and a radially outermost conductor accommodating position, A small segment in which a pair of legs are individually accommodated in the conductor accommodating position and the third conductor accommodating position in the radial direction is used. In the head side coil end, the head end of the large segment is arranged to wrap the head end of the small segment.

  Each phase coil thus configured is connected in a star shape, for example, to complete a U-shaped conductor sequential connection type coil. The neutral point lead line and phase output lead line of each phase coil (one-phase U-shaped conductor sequential connection type coil) can be obtained by dividing the U-shaped head of the U-shaped segment at an appropriate location, or It can be composed of two I-shaped conductors.

  A two-position U-shaped conductor sequential connection type coil that occupies the two conductor accommodating positions of the slot by increasing the conductor accommodating position of the slot, or a four-position U-shaped conductor that occupies the four conductor accommodating positions of the slot It is clear that a plurality of sequentially connected coils can be arranged in the radial direction. More specifically, in the two-position U-shaped conductor sequential connection type coil, the two conductor receiving positions adjacent to each other in the slot are occupied by the slot conductor portion of the U-shaped conductor, and in the four-position type U-shaped sequential connection coil, the slot is occupied. The two conductor receiving positions adjacent to each other are occupied by the slot conductor portion of the U-shaped conductor. If the two-position U-shaped conductor sequential connection type coil or the four-position U-shaped conductor sequential connection type coil is arranged to overlap in the radial direction, the motor output can be improved.

  Hereinafter, this method is referred to as a multiple coil radial stacking structure, and among these coils, the radially inner coil (that is, the inner U-shaped conductor sequential connection type coil) is referred to as the inner coil, and the radially outer coil ( That is, the outer U-shaped conductor sequential connection type coil) is abbreviated as an outer coil.

  In order to form the head skew portion and the skew crossing portion in the multi-coil radial overlapping structure described above, the inner coil U-shaped conductor and the outer coil U-shaped conductor can be simultaneously formed using a multiple rotation ring. Twisting methods have been proposed. Hereinafter, this method is referred to as a simultaneous twisting method or a simultaneous rotation method.

  In the multi-coil radial overlapping arrangement comprising the inner coil and the outer coil described above, the last (or first) slot conductor portion of the outer coil and the inner coil can be connected in series to the inner coil and the outer coil in phase. It is preferable that the inner coil and the outer coil are connected in series by using an inter-coil connecting wire having a first (or final) slot conductor portion and a specially shaped head portion connecting these two slot conductor portions. It is.

The above-described U-shaped conductor sequential connection type coil and the manufacturing method thereof have already reached the level of well-known technology according to the following patent documents described above, and therefore, further description of the prior art will be omitted. This U-shaped conductor sequential connection type coil clearly has a simpler winding structure than the conventional winding type stator coil, so that the slot space factor can be improved and the coil end can be made compact. The winding process can also be simplified.
Japanese Patent No. 3118837 Japanese Patent No. 3178468 Japanese Patent No. 3199068 JP 2000-139049 A JP 2000-350423 A JP 2001-045721 A JP 2001-069731 A JP 2001-245447 A JP 2002-218689 A JP 2003-189520 A JP 2004-032882 A JP 2004-032884 A JP 2004-032890 A JP 2004-032897 A JP 2004-048939 A JP 2004-089441 A JP 2004-048967 A JP 2004-064914 A JP 2004-166316 A JP 2005-6364 A JP 2005-211951 A

  However, in the multi-coil radial overlapping arrangement method composed of the inner coil and the outer coil as described above, the conventional inter-coil connecting wire is extended outward in the axial direction of the inner coil and the outer coil. There has been a problem that the length in the axial direction (coil end height) is increased, and the rotating electrical machine is increased in size and weight accordingly.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator coil for a rotating electrical machine in which the axial length of the head-side coil end is reduced and the rotating electrical machine is reduced in size and weight. .

Each of the inventions for solving the above problems includes an inner coil formed by sequentially connecting a plurality of inner coil U-shaped conductors inserted from one side in the axial direction to the inner coil conductor receiving position of the slot, and an outer side of the slot. An outer coil disposed on the radially outer side of the inner coil by sequentially connecting the tips of a plurality of outer coil U-shaped conductors inserted from one side in the axial direction to the coil conductor housing position; and one end of the inner coil And an end portion of the U-shaped conductor, and both ends of the head end portion of the U-shaped conductor. from in the circumferential direction and the stator coil of the configured rotary electric machine by a pair of head oblique portions are obliquely set reaches said slot relative to the axial direction, the inter-coil crossover wire head swash of the inner coil An inner skew crossing portion that reaches the slot by being inclined with respect to the circumferential direction and the axial direction at an equal position in the radial direction with respect to the section, and a circumferential direction at an equal position in the radial direction with respect to the head skew portion of the outer coil And the outer oblique crossing portion which is obliquely provided in the same direction and opposite to the inner oblique crossing portion with respect to the axial direction and reaches the slot, and the inner and outer obliquely inclined portions at different positions. possess a head bridging portion which connects extends obliquely spreads portion in the circumferential direction, the head transfer section is a recess between the coils between the head tip portion of the head tip portion and the outer coil of the inner coil A circumferentially extending portion that is accommodated in the circumferential portion and extends in the circumferential direction, and is accommodated between a segment gap between one end of the circumferentially extending portion and the head end portion of the inner coil, and extends substantially inwardly in the radial direction. The inner radial crossover portion reaching the inner oblique crossover portion and the circumferential crossover portion. The outer radial crossover portion that is accommodated between the segment gaps between the head end of the outer coil from the other end of the outer portion and extends substantially radially outward and reaches the outer oblique crossover portion; It is characterized by having.

  That is, the present invention is used for a stator coil of a multi-coil radial stacking system including an inner coil and an outer coil, and includes an inner skew crossing portion, an outer skew crossing portion, and a head crossing portion connecting them. It has the feature in the shape of the connecting wire between coils.

  In further detail, the inter-coil connecting wire of the present invention includes the first (or final) slot conductor portion of the inner coil, and jumps out from one end of the slot conductor portion to the head side coil end side and skews in the circumferential direction. An inner diagonal crossing part, a head crossing part extending radially outward from the diagonal crossing part, an outer diagonal crossing part obliquely running circumferentially from the head crossing part, and the diagonal crossing part. And a final (or first) slot conductor portion of the outer coil connected to the crossover portion. Furthermore, the other end of the pair of slot conductors is connected to another U-shaped conductor at the end side coil end.

  In particular, the first invention is characterized in that the head crossing portion is disposed at a position that does not protrude in the axial direction from the head end portions of the inner coil U-shaped conductor and the outer coil U-shaped conductor.

  In this invention, since the connecting wire between the coils is arranged on the inner side in the axial direction than the inner coil and the outer coil, an increase in the axial length of the head-side coil end can be prevented, and as a result, the size of the rotating electrical machine can be reduced. Weight reduction can be realized.

Further, the head connecting portions of coils between connecting wire includes a substantially radial gap between the head tip adjacent the U-shaped conductor for the inner coil, a circumferential recess between the inner and outer coils, for the outer coil Since the U-shaped conductor is sewed and extended with a substantially radial gap between head tips adjacent to each other, the inter-coil connecting wire is prevented from protruding outward in the axial direction from the inner coil and the outer coil. As a result, the inner coil and the outer coil can be compactly formed while preventing the interference between the inner coil and the outer coil and the connecting wire between the coils. it can.

  In a preferred embodiment, the radial crossing portion and the circumferential crossing portion are arranged at positions that do not protrude in the axial direction from the head end portions of the inner coil U-shaped conductor and the outer coil U-shaped conductor. Thereby, size reduction and weight reduction of a rotary electric machine is realizable.

  In a preferred embodiment, the circumferential connecting portion of the connecting wire between the coils is formed of a flat wire having a pair of side surfaces flat in the axial direction. Thereby, the circumferential direction transition part can be favorably accommodated in the inter-coil depression between the inner coil and the outer coil.

  In a preferred embodiment, the U-shaped conductor and the connecting wire between the coils are formed of a flat wire, and a radial connecting portion of the connecting wire between the coils, and the U-shaped conductor adjacent to the radial connecting portion in the circumferential direction. The head tip has side surfaces facing each other in parallel. Thereby, the radial crossover part of the inter-coil connecting wire can be satisfactorily accommodated between the head end portions of the inner coil U-shaped conductor and the outer coil U-shaped conductor that are adjacent to each other in the circumferential direction.

  In a preferred aspect, the pair of skew crossing portions are skewed in the same direction as the adjacent head skew portion. This makes it possible to satisfactorily accommodate the skew crossing portion of the inter-coil connecting wire between the head skew portions of the inner coil U-shaped conductor and the outer coil U-shaped conductor that are adjacent to each other in the circumferential direction.

  In the inter-coil connecting wire of each of the above inventions, the end-side undeveloped inter-coil connecting wire whose head side is formed in a final shape in advance is inserted into the other end-side undeveloped U-shaped conductor in the slot of the stator core. It can be inserted before or after or simultaneously.

  In addition, undeveloped inter-coil connecting wire conductors that have not yet been formed with skew crossing portions are simultaneously developed using a multi-rotation ring simultaneously with the U-shaped conductor for the inner coil and / or the U-shaped conductor for the outer coil. May be. However, when the deployment angle of the inter-coil connecting wire conductor is larger than the deployment angle of the U-shaped conductor for the inner coil or the U-shaped conductor for the outer coil, the multiple rotation ring is preliminarily rotated to The connecting wire conductor may be preliminarily developed, and then the inner coil U-shaped conductor, the outer coil U-shaped conductor, and the pre-developed inter-coil connecting wire conductor may be simultaneously developed.

  An embodiment in which the present invention is adopted as a stator coil of a vehicle alternator will be described with reference to the drawings. However, the present invention should not be construed as being limited to the following embodiments, and it is natural that the technical idea of the present invention may be implemented using other known techniques.

(Embodiment 1)
(Description of overall structure)
A sectional view in the axial direction of this vehicle alternator is shown in FIG. However, the stator coil 12 is schematically shown in FIG. The AC generator includes a stator 10 that functions as an armature, a rotor 50 that functions as a field element, a front housing 61 and a rear housing 62, and a rectifier 65 that converts AC power into DC power. The rotor 50 rotates integrally with the shaft 51 and includes a Landel pole core 52, a field coil 53, a slip ring 54, a mixed flow fan 56, and a centrifugal fan 57. The Landel-type pole core 52 is configured by combining a pair of pole cores 52a and 52b. The shaft 51 is driven to rotate by a vehicle engine through a pulley 58. The front housing 61 and the rear housing 62 support the rotor 50 and sandwich the stator 10.

  The stator 10 includes a stator core 11 and a stator coil 12 wound around the stator core 11. The stator coil 12 is a well-known U-shaped conductor sequential connection type coil configured by sequentially connecting a large number of U-shaped conductors. Reference numeral 13 denotes a head-side coil end that protrudes rearward from the stator core 11 of the stator coil 12, and reference numeral 14 denotes an end-side coil end that protrudes frontward from the stator core 11 of the stator coil 12. Therefore, each U-shaped conductor constituting the U-shaped conductor sequential connection type coil is inserted into each slot of the stator core 11 from the rear side to the front side. The leading end of each U-shaped conductor is sequentially connected for each phase to form three phase coils, and each phase coil is three-phase star-shaped to constitute the stator coil 12.

  In the embodiment shown in FIG. 1, the pair of leg portions of each U-shaped conductor is individually accommodated in a pair of slots separated by one magnetic pole pitch. In FIG. 1, the slot has eight conductor receiving positions in the radial direction, and the inner coil U-shaped conductor is inserted into the first to fourth conductor receiving positions from the radially inner side, and the fifth to eighth positions from the radially inner side. The outer coil U-shaped conductor is inserted through the conductor receiving position. The U-shaped conductors for the inner coils are sequentially connected on the end side to constitute an inner coil, and the U-shaped conductors for the outer coil are sequentially connected on the end side to constitute an outer coil. The inner coil and the outer coil are each composed of a three-phase coil, and the phase coils of the same phase of the inner coil and the outer coil are directly connected by an inter-coil connecting wire described later. In this embodiment, the remaining ends of each phase coil of the inner coil are connected to each other to form a neutral point, and the remaining ends of each phase coil of the outer coil constitute an external lead wire for each phase. Yes.

(Description of head side coil end)
The head-side coil end 13 is configured by a U-shaped head of each U-shaped conductor. The U-shaped head is a pair of U-shaped head tips and a semi-magnetic pole pitch extending (skewed) in the circumferential direction while approaching the axial slots from both ends of the head tips. It consists of a head skew part. One head skew part and the other head skew part of the same U-shaped head are arranged to be shifted by one conductor accommodating position pitch in the radial direction, and the U-shaped head tip is substantially in the radial direction. The pair of head end portions are connected to each other.

  Note that the end-side coil end 14 is formed by a protruding end portion of each U-shaped conductor. The projecting end portion extends from the slot and then extends away from the axial slot, and extends in the circumferential direction by a substantially semi-magnetic pole pitch (slopes), and a pair of end skew portions, It consists of an end portion protruding in the axial direction from the end of the skew portion. A pair of end tip portions adjacent to each other in the radial direction of the inner coil U-shaped conductor are welded, and a pair of end tip portions adjacent to each other in the radial direction of the outer coil U-shaped conductor are welded.

  In this embodiment, the inner coil and the outer coil are composed of the four-position U-shaped conductor sequential connection type coil composed of the U-shaped conductors that occupy the four conductor receiving positions that are adjacent to each other in the radial direction. The structure is essentially the same. The U-shaped conductor for the inner coil used for the inner coil will be described with reference to FIG. The shape and structure of the outer coil U-shaped conductor used for the outer coil are also the same as those shown in FIG.

  In FIG. 2, the large segment 17, which is a U-shaped conductor having a large head curvature radius, is inserted into the first and fourth conductor accommodation positions among the four conductor accommodation positions continuous in the radial direction of each slot. A small segment 27 that is a U-shaped conductor having a small head curvature radius is inserted through the conductor receiving position. A pair of slot insertion portions of the large segment 17 are referred to as slot conductor portions 18a and 18b. A pair of slot insertion portions of the small segment 27 are referred to as slot conductor portions 28a and 28b. 19 is a U-shaped head of the large segment 17, and 29 is a U-shaped head of the small segment 27. The large segment 17 has a pair of protruding end portions 21a and 21b, and the protruding end portions 21a and 21b have end oblique portions 22a and 22b and end end portions 23a and 23b. Similarly, the small segment 27 has a pair of protruding end portions 31a and 31b, and the protruding end portions 31a and 31b have end oblique portions 32a and 32b and end tip portions 33a and 33b. The end tip portions 23b and 33b are welded to become a welded portion 41a, and the end tip portions 23a and 33a are welded to become a welded portion 41b. Eventually, it can be seen that the four-position U-shaped conductor sequential connection type coil is constituted by the small segment 27 and the large segment 17 surrounding the small segment 27.

  The shape of the head side coil end 13 of the stator coil 12 using the pair of the large segment 17 and the small segment 27 is shown in FIG. Reference numeral 100 denotes an inner coil, and reference numeral 200 denotes an outer coil. In FIG. 3, 17 a is the head tip of the large segment 17 that is a large U-shaped conductor, 27 a is the head tip of the small segment 27 that is a small U-shaped conductor, and 17 b is the radially inner side of the large segment 17. A head skew portion, 17c is a head skew portion on the radially outer side of the large segment 17, 27b is a head skew portion on the radially inner side of the small segment 27, and 27c is a head portion on the radially outer side of the small segment 27. An oblique portion, 17d is a slot conductor portion inside the large segment 17, 17e is a slot conductor portion outside the large segment 17, 27d is a slot conductor portion inside the small segment 27, and 27e is a slot conductor portion outside the small segment 27. Part.

  The slot of the stator core 11 has eight conductor housing positions C1 to C8 in the radial direction. The conductor housing positions C1 to C4 accommodate the slot conductor portions 17d, 27d, 27e, and 17e of the large segment 17 and the small segment 27 that constitute the inner coil 100. The conductor housing positions C5 to C8 accommodate the slot conductor portions 17d, 27d, 27e, and 17e of the large segment 17 and the small segment 27 that constitute the outer coil 200.

  The standard structure and manufacturing method of the above-described four-position U-shaped conductor sequential connection type coil are described in detail in each of the above-mentioned patent documents, for example, Patent Document 20 and the like. Description is omitted. However, the present invention can be applied to, for example, a two-position U-shaped conductor sequential connection type coil in addition to the above-described four-position U-shaped conductor sequential connection type coil.

(Description of feature structure)
The features of this embodiment will be described in detail below with reference to FIGS. FIG. 3 is a side view of the vicinity of the head-side coil end 13, and FIG. 4 is a circumferential partial development view showing a state where the vicinity of the inter-coil connecting wire 300 of the head-side coil end 13 is developed in the circumferential direction.

  In FIG. 3, reference numeral 300 denotes an inter-coil connecting wire for connecting the inner coil 100 and the outer coil 200 in series for each phase. The inter-coil connecting wire 300 is an inter-coil connecting wire that connects one end of the inner coil and one end of the outer coil 200. The inter-coil connecting wire 300 includes an inner slot conductor portion 301 accommodated in a conductor accommodating position C1 of a predetermined slot, an outer slot conductor portion 302 accommodated in a conductor accommodating position C8 of a predetermined slot, and a slot conductor portion. 301, an inner oblique crossing portion 303 obliquely provided in the same direction as the head oblique portion 17b of the inner coil 100, and a head portion of the outer coil 200 extending from the slot conductor portion 302. It consists of an outer oblique transition part 304 that is obliquely arranged in the same direction as the oblique part 17c, and a head transition part 305 that connects the two oblique transition parts 303 and 304. The slot conductor part 301 constitutes the first (or last) slot conductor part of the inner coil 100, and the slot conductor part 302 constitutes the last (or first) slot conductor part of the outer coil 200.

  In this embodiment, as shown in FIGS. 3 and 4, the head crossover portion 305 is disposed at a position that does not protrude outward in the axial direction from the head tip portion 17 a of the large segment 17 of the inner coil 100 and the outer coil 200. Has been. For this reason, the axial direction length of the head side coil end 13 can be shortened.

  Further, in this embodiment, the skew crossing portion 303 on the inner side of the inter-coil connecting wire 300 is obliquely installed in the same direction as that of the innermost head skew portion 17b in the radial direction of the inner coil 100 at the same radial direction. In addition, an oblique crossing portion 304 on the outer side of the inter-coil connecting wire 300 is obliquely provided in the same direction as the outermost head oblique portion 17c in the radial direction of the outer coil 200 at the same position in the radial direction. In other words, the inner skew crossing portion 303 that is connected to the inner end in the radial direction of the head crossover portion 305 of the inter-coil connecting wire 300 and skews in the circumferential direction and the axial direction is the head skew inside each large segment 17. Since one of the parts 17b is spatially arranged at the innermost side of the inner coil 100 at a position that should be occupied, the continuity and direction change from the inner skew transition part 303 to the head transition part 305 are different from each other. It is not obstructed by each part of the segment 17. Similarly, the outer oblique transition portion 304 that is connected to the radially outer end of the head transition portion 305 of the inter-coil connecting wire 300 and obliquely travels in the circumferential direction and the axial direction is also applied to the outer oblique portion of each large segment 17. Since the row portion 17c is spatially arranged on the outermost side of the outer coil 200 at a position to be occupied, the continuity and direction change from the outer oblique crossover portion 304 to the head crossover portion 305 are another large segment. 17 parts are not disturbed. That is, the inter-coil connecting wire 300 can be arranged in a compact manner while suppressing spatial interference with other U-shaped conductors.

  FIG. 5 shows a state in which the vicinity of the inter-coil connecting wire 300 of the head side coil end 13 is viewed from the rear in the axial direction. The head crossover portion 305 includes a circumferential crossover portion 3051 described later, an inner radial crossover portion 3052, and an outer radial crossover portion 3053. The circumferential crossover portion 3051 is accommodated in the inter-coil recess portion x located between the head tip portion 17a of the inner coil 100 and the head tip portion 17a of the outer coil 200 and extending in the circumferential direction. Extend to.

  The inner radial crossing portion 3052 is accommodated in the inter-segment gap y between one end of the circumferential crossing portion 3051 and the head tip portion 17a of the large segment 17 of the inner coil 100 and extends substantially inward in the radial direction. Yes. That is, the inner radial crossing portion 3052 extends substantially in the radial direction in the same manner as the other head tip portion 17a at a position that one of the head tip portions 17a of each large segment 17 of the inner coil 100 should occupy. ing.

  The outer radial crossover portion 3053 is accommodated in the inter-segment gap z between the other end of the circumferential crossover portion 3051 and the head tip portion 17a of the large segment 17 of the outer coil 200 and extends substantially outward in the radial direction. ing. That is, the outer radial crossing portion 3053 extends substantially in the radial direction in the same manner as the other head tip portion 17a at a position that one of the head tip portions 17a of each large segment 17 of the outer coil 200 should occupy. ing.

  In FIG. 5, for easy understanding, the inter-segment gaps y and z between the head end portions 17 a of the two large segments 17 adjacent to each other are shown large. , Z can be further reduced.

  By forming the head crossover portion 305 of the coil crossover wire 300 in a substantially crank shape as shown in FIG. 5, the head crossover portion 305 of the coil crossover wire 300 can be arranged in a compact manner, and the head side coil end 13 axial protrusion lengths can be reduced. Further, by adjusting the length and position of the circumferential crossover portion 3051 of the head crossover portion 305, the start (or end) position for each phase of the inner coil 100 to be connected to the outer coil 200 for each phase is appropriately set. You can choose. Similarly, the end (or start) position for each phase of the outer coil 200 to be connected to the inner coil 100 for each phase can be appropriately selected.

(Example effect)
After all, according to this embodiment, since the inter-coil crossover wire 300 can be compactly arranged while suppressing spatial interference with the inner coil 100 and the outer coil 200, electric insulation at the head side coil end 13 is ensured. The increase in the axial length of the head-side coil end can be prevented, and as a result, the rotating electrical machine can be reduced in size and weight.

  Further, in this embodiment, as shown in FIG. 4, the circumferential crossover portion 3051 of the inter-coil connecting wire 300 is a rectangular wire having a side surface S1 that is flat in the axial direction and a side surface S2 that is flat in the radial direction. Consists of. Thereby, the circumferential crossover portion 3051 is satisfactorily accommodated in the inter-coil depression x between the head tip portion 17a of the large segment 17 of the inner coil 100 and the head tip portion 17a of the large segment 17 of the outer coil 200. It is possible to prevent the circumferential crossing portion 3051 from protruding outward in the axial direction.

  Further, according to this aspect, the large segment 17, the small segment 27, and the inter-coil connecting wire 300 are each made of a flat wire, and the inner radial connecting portion 3052 and the outer radial connecting portion of the inter-coil connecting wire 300. 3053 and the head end portions 17a of the large segments 17 adjacent in the circumferential direction with respect to these radial crossover portions 3051 and 3052 have side surfaces facing each other substantially parallel to each other. Since the radial crossover portions 3051 and 3052 of the large segments 17 extend in a substantially radial direction at the position where one of the head end portions 17a of the large segments 17 should occupy, the radial crossover portions 3051 and 3052 of the inter-coil crossover wire 300 Can be satisfactorily accommodated in the inter-segment gaps y and z which are located between the head end portions 17a of the large segments 17 and extend in the substantially radial direction.

  Further, according to this aspect, the pair of skew crossing portions 303 and 304 of the head crossover portion 305 is skewed in the same direction as the head skewing portions 17b and 17c of the large segment 17 adjacent in the circumferential direction, In addition, since the skew crossing portions 303 and 304 face each other, the skew crossing portions 303 and 304 of the inter-coil connecting wire 300 and the head skew portion 17b and 17c are substantially parallel flat side surfaces facing each other. have. In other words, the skew crossing portions 303 and 304 of the inter-coil connecting wire 300 are adjacent to the head skewing portions 17b and 17c adjacent to each other at a position to be occupied by one of the head skewing portions 17b and 17c of each large segment 17. Since the face-to-face arrangement was made in parallel, the skew crossing sections 303 and 304 could be arranged in a compact manner.

(Embodiment 2)
Another embodiment of the inter-coil connecting wire 300 will be described in detail below with reference to FIGS. This embodiment is characterized in that the inter-coil connecting wire 300 is disposed between the conductor housing positions C2 and C7. FIG. 6 is a side view of the vicinity of the head-side coil end 13, and FIG. 7 is a circumferential partial development view showing a state in which the vicinity of the inter-coil connecting wire 300 of the head-side coil end 13 is developed in the circumferential direction.

  In FIG. 6, the inter-coil connecting wire 300 extends from the inner slot conductor portion 301 accommodated in the conductor accommodating position C <b> 2, the outer slot conductor portion 302 accommodated in the conductor accommodating position C <b> 7, and the slot conductor portion 301. An inner skew crossing portion 303 obliquely provided in the same direction as the head skew portion 27b of the inner coil 100, and a head skew portion 27c of the outer coil 200 extending from the slot conductor portion 302. And an outer oblique transition portion 304 that is obliquely arranged in the same direction in the circumferential direction, and a head transition portion 305 that connects the two oblique transition portions 303 and 304. The slot conductor part 301 constitutes the first (or last) slot conductor part of the inner coil 100, and the slot conductor part 302 constitutes the last (or first) slot conductor part of the outer coil 200.

  In this embodiment, as shown in FIGS. 6 and 7, the head crossover portion 305 is disposed at a position that does not protrude outward in the axial direction from the head tip portion 17 a of the large segment 17 of the inner coil 100 and the outer coil 200. Has been. For this reason, the axial direction length of the head side coil end 13 can be shortened.

  Further, in this embodiment, an oblique crossing portion 303 inside the inter-coil connecting wire 300 is obliquely installed in the same direction as the head oblique portion 27b of the inner coil 100 in the radial direction, and further, between the coils. A skew crossing portion 304 outside the connecting wire 300 is obliquely provided in the same direction as the head skew portion 27c of the outer coil 200 at the same radial position. That is, the inner skew crossing portion 303 that is connected to the inner end in the radial direction of the head crossover portion 305 of the inter-coil connecting wire 300 and skews in the circumferential direction and the axial direction is the head skew inside each small segment 27. Since one of the portions 27b is spatially disposed at a position to be occupied, the continuity and direction change from the inner skew crossing portion 303 to the head crossing portion 305 are obstructed by the other small segments 27. There is nothing to do. Similarly, the outer oblique transition portion 304 that is connected to the radially outer end of the head transition portion 305 of the inter-coil connecting wire 300 and obliquely travels in the circumferential direction and the axial direction is also applied to the outer head oblique portion of each small segment 27. Since the row portion 27c is spatially arranged at a position to be occupied, the continuity and direction change from the outer oblique crossover portion 304 to the head crossover portion 305 are obstructed by other portions of the small segment 27. There is nothing. That is, the inter-coil connecting wire 300 can be arranged in a compact manner while suppressing spatial interference with other U-shaped conductors.

  FIG. 8 shows a state in which the vicinity of the inter-coil connecting wire 300 of the head side coil end 13 is viewed from the rear in the axial direction. The head crossover portion 305 includes a circumferential crossover portion 3051 described later, an inner radial crossover portion 3052, and an outer radial crossover portion 3053. The circumferential crossover portion 3051 is accommodated in the inter-coil recess portion x located between the head tip portion 17a of the inner coil 100 and the head tip portion 17a of the outer coil 200 and extending in the circumferential direction. Extend to.

  The inner radial crossing portion 3052 is accommodated in the inter-segment gap y between one end of the circumferential crossing portion 3051 and the head tip portion 17a of the large segment 17 of the inner coil 100 and extends substantially inward in the radial direction. Yes. However, in the second embodiment, unlike in the first embodiment, the inner radial crossing portion 3052 is located at the position where one of the head tip portions 17a of the large segments 17 of the inner coil 100 should occupy the other head. Like the tip portion 17a, it does not extend in the substantially radial direction. Instead, in the second embodiment, the inner radial crossing portion 3052 is the same as the other head tip portion 27a at a position that one of the head tip portions 27a of each small segment 27 of the inner coil 100 should occupy. Extends substantially in the radial direction.

  The outer radial crossover portion 3053 is accommodated in the inter-segment gap z between the other end of the circumferential crossover portion 3051 and the head tip portion 17a of the large segment 17 of the outer coil 200 and extends substantially outward in the radial direction. ing. However, in the second embodiment, unlike in the first embodiment, the outer radial crossing portion 3053 is located at the position where one of the head tip portions 17a of the large segments 17 of the outer coil 200 should occupy the other head. Like the tip portion 17a, it does not extend in the substantially radial direction. Instead, in the second embodiment, the outer radial crossing portion 3053 is the same as the other head tip portion 27a at a position that one of the head tip portions 27a of the small segments 27 of the outer coil 200 should occupy. Extending substantially in the radial direction. Therefore, the inter-coil connecting wire 300 according to the second embodiment needs to secure inter-segment gaps y and z between the two head tip portions 17a and 17a of the large segment 17 adjacent to each other in the circumferential direction. In this embodiment, the gap between the radial crossover portions 3052 and 3053 of the inter-coil connecting wire 300 and the head end portion 17a of the large segment 17 is smaller than that in the first embodiment. In other respects, the inter-coil connecting wire 300 of the second embodiment can achieve the same effects as the inter-coil connecting wire 300 described in the first embodiment.

(Comparative example)
Another embodiment of the inter-coil connecting wire 300 is shown in FIGS. 9 to 11 as a comparative example for the inter-coil connecting wire 300 of the first and second embodiments. However, it should be noted that the conductor accommodation position arrangement order in FIG. 11 is opposite to that in FIGS. 3 and 6.

  The slot conductor portion of the inter-coil connecting wire 300 is disposed between the conductor housing positions C2 and C6. FIG. 9 is a side view of the vicinity of the head-side coil end 13, and FIG. 10 is a circumferential partial development view showing a state in which the vicinity of the inter-coil connecting wire 300 of the head-side coil end 13 is developed in the circumferential direction. 11 is a front view of the head side coil end 13 viewed from the axial rear side.

  In FIG. 9, reference numeral 300 denotes an inter-coil connecting wire for connecting the inner coil 100 and the outer coil 200 in series for each phase. The inter-coil connecting wire 300 is an inter-coil connecting wire that connects one end of the inner coil 100 and one end of the outer coil 200. C1 to C8 indicate eight conductor housing positions arranged in the radial direction of the slot. C1 indicates the radially innermost conductor accommodation position, and C8 indicates the radially outermost conductor accommodation position. The inter-coil connecting wire 300 includes an inner slot conductor portion 301 accommodated in a conductor accommodating position C2 of a predetermined slot, an outer slot conductor portion 302 accommodated in a conductor accommodating position C6 of a predetermined slot, and a slot conductor portion. 301, an inner oblique crossing portion 303 obliquely provided in the same circumferential direction as the head oblique portion 27b of the small segment 27 of the inner coil 100, and an outer coil extending from the slot conductor portion 302. It consists of an outer oblique moving part 304 obliquely arranged in the same direction as the head oblique part 27b of the 200 small segments 27 and a head moving part 305 connecting the two oblique moving parts 303 and 304. . The slot conductor part 301 constitutes the first (or last) slot conductor part of the inner coil 100, and the slot conductor part 302 constitutes the last (or first) slot conductor part of the outer coil 200. The skew crossing portion 303 on the inner side of the inter-coil connecting wire 300 is obliquely installed in the same direction as the head skew portion 27b of the inner coil 100 at the same position in the radial direction. The skew crossing portion 304 is obliquely provided in the same direction as the head skew portion 27b of the outer coil 200 at the same position in the radial direction. In other words, the inner skew crossing portion 303 that is connected to the radially inner end of the head crossover portion 305 of the inter-coil connecting wire 300 and skews in the circumferential direction and the axial direction is the head oblique portion of the small segment 27 of the inner coil 100. One of the row portions 27b is arranged at a position to be occupied. In addition, the outer oblique crossing portion 304 that is connected to the radially outer end of the head crossover portion 305 of the inter-coil connecting wire 300 and skews in the circumferential direction and the axial direction is a head oblique portion of the small segment 27 of the outer coil 200. The row part 27b is arranged at a position to be occupied. That is, the skew crossing portion 303 of the inter-coil connecting wire 300 is obliquely installed in the same direction as the head oblique portion 27b of the small segment 27 of the inner coil 100 in the radial direction, and further, the inter-coil connecting wire Since 300 oblique crossing portions 304 are obliquely provided in the same direction as the head oblique portion 27b of the small segment 27 of the outer coil 200 in the same direction as the radial direction, the head from the oblique crossing portions 303 and 304 is provided. Continuation to the crossover unit 305 and direction change are not obstructed by each part of the other small segment 27.

  Next, the head crossover part 305 will be described in more detail. FIG. 11 shows a state where the vicinity of the inter-coil connecting wire 300 of the head-side coil end 13 is viewed from the rear in the axial direction. The head crossover portion 305 includes a circumferential crossover portion 3051 that extends in the circumferential direction along the boundary between the inner coil 100 and the outer coil 200, an inner radial crossover portion 3052, and an outer radial crossover portion 3053. It consists of.

  The circumferential crossover portion 3051 is accommodated in the inter-coil recess portion x located between the head tip portion 17a of the inner coil 100 and the head tip portion 17a of the outer coil 200 and extending in the circumferential direction. Extend to. The inner radial crossing portion 3052 is accommodated in the inter-segment gap y between one end of the circumferential crossing portion 3051 and the head tip portion 17a of the large segment 17 of the inner coil 100 and extends substantially inward in the radial direction. Yes. However, in this comparative example, the inner radial crossing portion 3052 is substantially the same diameter as the other head tip portion 17a at a position that one of the head tip portions 17a of each large segment 17 of the inner coil 100 should occupy. Does not extend in the direction. Instead, the inner radial crossing portion 3052 extends substantially in the radial direction in the same manner as the other head tip portions 27a at the position where one of the head tip portions 27a of each small segment 27 of the inner coil 100 should occupy. Exist. The outer radial crossover portion 3053 is accommodated in the inter-segment gap z between the other end of the circumferential crossover portion 3051 and the head tip portion 17a of the large segment 17 of the outer coil 200 as shown in FIG. The large segment 17 is bent so as to cover the outer side in the axial direction of the head end portion 17a of the large segment 17, and then bent into the inter-segment gap z, and then obliquely runs counterclockwise. For this reason, the axial length of the head-side coil end 13 described above increases. Further, the inter-coil connecting wire 300 according to the third embodiment needs to sufficiently secure the inter-segment gaps y and z between the two head tip portions 17a and 17a of the large segment 17 adjacent to each other in the circumferential direction. is there. In this comparative example, the gap between the radial crossover portions 3052 and 3053 of the inter-coil connecting wire 300 and the head end portion 17a of the large segment 17 is smaller than that in the first embodiment. 5, 8, and 11, the black colored region is a flat side surface that forms the rear end surface of the head crossover portion 305 of the inter-coil connecting wire 300.

(Modification)
In the first and second embodiments described above, the head crossing portion 305 of the inter-coil connecting wire 300 is formed in the circumferential recess between the U-shaped head tip portion 17a of the large segment 17 of the inner coil 100 and the outer coil 200 as much as possible. The head crossing of the rectangular cross section is satisfactorily accommodated in the part x and the inter-segment gaps y and z so as not to come into contact with the head end part 17a of the adjacent large segment 17 and to prevent the rearward projection in the axial direction. The postures of the flat surfaces of the part 305 and the skew crossing parts 303 and 304 were set.

  This means that the head crossover portion 305 of the inter-coil connecting wire 300 is twisted at a substantially right angle at the connection point between the circumferential crossover portion 3051 and the radial crossover portions 3052 and 3053. This twisting is preferably performed as a rotation axis parallel to the axial direction of the stator core. Thereby, the rear end surface of the crank shape colored and shown in FIGS. 3 and 6 can be formed. However, the aspect ratio of the rectangular cross section of the flat wire constituting the inter-coil connecting wire 300 is arbitrary, and when the rectangular cross section is a rectangle, the wide side surface and the narrow side surface have a recess between the coils as necessary. It is possible to set which posture is to be set by x and inter-segment gaps y and z, and the twist axis direction can be changed accordingly.

(Modification)
The above-described inter-coil connecting wire 300 of Embodiments 1 and 2 or the inter-coil connecting wire 300 shown in the comparative example includes, for example, the U-phase coil of the inner coil 100 and the U-phase coil of the outer coil 200, for example. Connect in series.

  At this time, there may be a case where the inter-coil connecting wire 300U for the U-phase coil and the other two-phase inter-coil connecting wires 300V and 300W need to overlap in the circumferential direction.

  In this case, the connecting wire between one coil is arranged on the lower layer in the axial direction, and the connecting wire between the other coils is arranged on the higher layer side in the axial direction, so that the two connecting wires between the coils do not overlap spatially. Of course it can be done. This multi-coil crossover wiring arrangement structure is referred to as a two-story structure. An example of this two-story structure is shown in FIG. In this case, it is preferable to use the inter-coil connecting wire 300 having a small axial length shown in the first and second embodiments on the lower layer side. In FIG. 12, the inter-coil connecting wire 300 according to the first embodiment is arranged on the lower layer side, and the inter-coil connecting wire 300 'corresponding to the inter-coil connecting wire 300 shown in the second embodiment is arranged on the higher layer side.

(Explanation of how to expand the inter-coil connecting wire 300)
The inter-coil connecting wire 300 is an end-side undeveloped inter-coil connecting wire in which the skew crossing portions 303 and 304 are formed, and an end-side undeveloped U-shaped conductor for the inner coil 100 and the outer coil 200 is a stator core. It can be inserted into the slots of the stator core before, after or simultaneously with the insertion of the slots.

  In addition, the undeveloped inter-coil connecting wire conductor in which the skew crossing portions 303 and 304 of the inter-coil connecting wire 300 are not yet formed can be used simultaneously with the U-shaped conductor for the inner coil and / or the U-shaped conductor for the outer coil. You may unfold simultaneously using a multiple rotation ring. However, a crank shape is given in advance to the head crossover portion 305 of the inter-coil connecting wire 300 shown in the first and second embodiments, so that the circumferential crossover portion 3051, the inner radial crossover portion 3052, and the outer radial crossover portion. 3053 is formed.

  If the undeveloped angle of the inter-coil connecting wire conductor is larger than the undeveloped inner coil U-shaped conductor or outer coil U-shaped conductor, the multiple rotation ring is used. Preliminary rotation and pre-deployment of undeveloped inter-coil connecting wire conductors by a necessary angle, and then U-conductor for inner coil, U-conductor for outer coil, and pre-deployed inter-coil transition Line conductors may be deployed simultaneously.

  As already known, undeveloped U-shaped conductors using multiple rotating rings and undeveloped inter-coil connecting wire conductors (also referred to as inter-coil connecting wire U-shaped conductors) Of the pair of leg portions of the conductor, except for the portion that should become the head skew portion and the skew crossing portion, set in the hole of the predetermined ring of the multiple rotation ring, and each ring of the multiple rotation ring What is necessary is just to rotate a semi-magnetic pole pitch to the defined direction, for example. At this time, it is preferable to hold the head tip portion and the head crossing portion with a predetermined holding member in order to prevent undesirable deformation. The rotation by this type of multiple rotation ring and the shape maintaining mechanism such as the tip of the head at that time are described in detail in, for example, Patent Document 20 and so on, so refer to them as necessary.

1 is an axial cross-sectional view of a vehicle AC generator that employs a stator coil of Embodiment 1. FIG. It is a model perspective view of the U-shaped conductor pair for coils which consists of a large segment and a small segment. FIG. 3 is a schematic side view in the axial direction illustrating the head-side coil end structure of the first embodiment. FIG. 4 is a partial circumferential development of the head-side coil end of FIG. 3. It is the partial front view which looked at the head side coil end of FIG. 3 from back. 6 is a schematic axial side view showing a head-side coil end structure of Embodiment 2. FIG. FIG. 7 is a partial circumferential development of the head-side coil end of FIG. 6. It is the partial front view which looked at the head side coil end of FIG. 6 from back. It is an axial direction schematic side view which shows the head side coil end structure of a comparative example. FIG. 10 is a partial circumferential development of the head-side coil end of FIG. 9. It is the partial front view which looked at the head side coil end of FIG. 9 from back. It is a figure which shows the crossover structure between two-story coils, (a) is the axial schematic model side view, (b) is the partial circumferential direction expanded view.

Explanation of symbols

x Indentation between coils
y Inter-segment gap
z Inter-segment gap C1 to C8 Conductor accommodation position 10 Stator 11 Stator core 12 Stator coil 13 Head side coil end 14 End side coil end 17 Large segment 17a Head end 17b Head skew 17c Head skew 17d Slot conductor portion 17e Slot conductor portion 18a Slot conductor portion 21a End portion 22a End skew portion 22b End skew portion 23a End tip portion 23b End tip portion 27 Small segment 27a Head tip portion 27b Head skew Part 27c Head skew part 27d Slot conductor part 27e Slot conductor part 28a Slot conductor part 31a End part 32a End part skew part 32b End part skew part 33a End part tip part 33b End part tip part 41a Weld part 41b Weld part 50 Rotor 51 Shaft 52 Landel Type Pole Core 52a Pole Core 53 Field Coil 54 Slip Ring 56 Diagonal flow fan 57 Centrifugal fan 58 Pulley 61 Front housing 62 Rear housing 65 Rectifier 100 Inner coil 200 Outer coil 300 Inter-coil crossover wire 301 Slot conductor portion 302 Slot conductor portion 303 Oblique crossover portion 304 Oblique crossover portion 305 Head Crossover portion 3051 Circumferential crossover portion 3052 Inner radial crossover portion 3053 Outer radial crossover portion

Claims (5)

An inner coil formed by sequentially connecting the ends of a large number of U-shaped conductors for the inner coil inserted from one side in the axial direction to the inner coil conductor housing position of the slot, and one axial direction at the outer coil conductor housing position of the slot A plurality of outer coil U-shaped conductors inserted from the side are sequentially connected to connect an outer coil disposed radially outside the inner coil, and one end of the inner coil and one end of the outer coil are connected. And a connecting wire between the coils
The head side coil ends of the inner coil and the outer coil are a pair of head ends of the U-shaped conductor and a pair that is obliquely provided in the circumferential direction and the axial direction from both ends of the head end portion and reaches the slot. In the stator coil of the rotating electrical machine constituted by the head skew portion of
The connecting wire between the coils is
An inner skew crossing portion that is obliquely arranged in the circumferential direction and the axial direction at the same position in the radial direction as the head skew portion of the inner coil and that reaches the slot, and the head skew portion of the outer coil At the same position in the radial direction and in the circumferential direction and the axial direction in the same direction as the inner oblique crossing portion and in an opposing state, the outer oblique crossing portion reaching the slot and at different positions from each other. A head transition part extending in the circumferential direction and connected to the oblique and inner oblique transition parts provided obliquely;
The head crossing part is
A circumferential crossover portion that is accommodated in a recess between the coils between the head tip of the inner coil and the head tip of the outer coil and extends in the circumferential direction;
The inner radial direction that is accommodated in the segment gap between the head end portion of the inner coil from one end of the circumferential crossover portion and extends substantially inwardly in the radial direction and reaches the inner oblique crossover portion. A crossover,
The outer diameter that is accommodated in the segment gap between the head end of the outer coil from the other end of the circumferential crossing portion and extends substantially radially outward and reaches the outer skew crossing portion. A direction crossing section,
A stator coil for a rotating electrical machine, comprising: In the stator coil of the rotating electrical machine according to claim 1 ,
The radial crossover portion and the circumferential crossover portion are stator coils of a rotating electrical machine that are disposed at positions that do not protrude in the axial direction from the head end portions of the inner coil U-shaped conductor and the outer coil U-shaped conductor. In the stator coil of the rotating electrical machine according to claim 1 ,
The circumferential transition portion is a stator coil of a rotating electrical machine that is formed of a flat wire having a pair of side surfaces that are flat in the axial direction. In the stator coil of the rotating electrical machine according to claim 3 ,
The U-shaped conductor and the connecting wire between the coils are formed of a flat wire,
A stator coil for a rotating electrical machine, wherein the crossover portion between the coils in the radial direction and the head end portion of the U-shaped conductor adjacent to the radial crossover portion in the circumferential direction respectively have side surfaces facing each other in parallel. In the stator coil of the rotating electrical machine according to claim 1 ,
The pair of skew crossing portions is a stator coil of a rotating electrical machine that is skewed in the same direction as an adjacent head skew portion.

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