JP5691266B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a rotating electrical machine stator, and more particularly to a rotating electrical machine stator including distributed winding phase windings.

  A stator of a rotating electrical machine is provided with a plurality of radially extending winding grooves called slots, around which a conductor wire is wound to form a coil winding. As a method of winding a coil around a stator, a conductor is wound between a concentrated winding in which a conductor wire is wound around one tooth sandwiching adjacent slots to form one coil winding, and a slot spaced across a predetermined number of slots. Distributed winding is performed in which a wire is wound into one coil winding. In the case of distributed winding, conductor wires are wound in a predetermined order between a plurality of slots of the stator, so that a plurality of coil windings overlap or different coil windings are arranged in the same slot. As a result, various ideas are made.

  For example, in Patent Document 1, as a distributed winding stator using a rectangular conductor for a coil, for example, nine coil strands are combined in a 3 × 3 shape to form one formed coil, which has seven slots of the stator. In the case of being inserted across the coil, a configuration is disclosed in which the crown and the terminal portion side top are bent into a crank shape on the surface of the coil wire in the layering direction. Here, each of the top portions is formed into a crank shape so as to be displaced by the width direction dimension B1 of the three coil strands of the formed coil and within the interval B2 between the adjacent stator slots, It is stated that when the formed coils are sequentially inserted into the corresponding slots, they can be inserted into the slots without hitting each other.

JP 2008-104293 A

  In the case of distributed winding, a coil formed by winding a coil wire at a unit coil interval with a predetermined slot interval as a unit coil interval is referred to as a unit coil. For example, in a three-phase synchronous rotating electric machine, A plurality of the unit coils are sequentially arranged along the circumferential direction of the stator to form each phase winding. In the prior art, the shape of each unit coil is made symmetric, and the direction of current flow in each phase winding is made symmetric in the stator as a whole. In this way, when emphasizing symmetry, when the unit coils that make up each phase winding make a round along the circumferential direction of the stator, the winding start and end of the phase winding are placed in the same slot. May be.

  An in-phase potential difference is applied from the drive circuit of the rotating electrical machine between the start and end of winding of each phase winding. In the case of a rotary electric machine driven by high voltage and high power, the potential difference in each phase also becomes a high potential difference, but two conductor wires having the high potential difference may be arranged in the same slot. For example, if the U-V phase potential difference is 600V and the connection between the phase coils is Y-connection, the in-phase potential difference, which is the potential difference between the U phase and the neutral point, is approximately 2/3 of 600V, which is 400V. It is. In order to prevent a short circuit or the like that may occur due to such a high potential difference being in the same slot, an appropriate insulation process or the like is required.

  In the case of distributed winding, depending on the arrangement order of unit coils, a predetermined slot interval may be between one unit coil and the next unit coil. In this case, the winding end position of one unit coil and the winding start position of the next unit coil are considerably separated from each other along the circumferential direction of the stator. Tying is done. As the number of unit coils increases, the number of crossovers also increases, and accordingly, the volume of the winding portion of the stator increases accordingly.

  In addition, instead of winding a continuous conductor wire to form a unit coil, a coil element wire called a segment coil is bent, and a plurality of these are arranged in the same slot, and adjacent tip sides are welded together. Etc. are connected. In this case, since the segment coil is bent, the bending of the segment coil makes it difficult to position the tip to be welded.

  The objective of this invention is providing the rotary electric machine stator which makes it possible to suppress the electrical potential difference between the different unit coils arrange | positioned at the same slot. Another object is to provide a rotating electric machine stator having no crossover wires. Still another object is to provide a rotating electrical machine stator that facilitates positioning of the tip of adjacent segment coils when a unit coil is formed using a plurality of segment coils. The following means contribute to at least one of these purposes.

A rotating electrical machine stator according to the present invention includes a stator core that is arranged along a circumferential direction and that has a plurality of slots each extending in a radial direction, and a coil wire at a unit coil interval with a predetermined slot interval as a unit coil interval. Distributed winding each phase including a coil formed by winding a coil as a unit coil and 2n unit windings formed by arranging 2n unit coils in a predetermined arrangement order in the circumferential direction of the stator core. windings, neither of the two slot coil wire No. 1 coil is inserted, any original two slots coil wires of 2n-th coil is inserted, unlike each other, the 1st coil coil One of the two slots into which the wire is inserted is the same as one of the two slots into which the coil wire of the nth coil is inserted, and the coil wire of the (n + 1) th coil is inserted. One of the two slots that is characterized by one same der Rukoto of the two slots in which the coil wire of 2n-th coil is inserted.

  In the rotating electrical machine stator according to the present invention, each phase winding of the distributed winding is such that the other side of the two slots into which the coil wire of the i-th coil is inserted is the coil wire of the (i + 1) -th coil. Preferably, it is the same as one side of the two slots to be inserted.

  Moreover, in the rotating electrical machine stator according to the present invention, the distributed winding phase coils are arranged at the same interval as the unit coil interval by bending both ends of one conductor strand as a coil strand. Using a plurality of coils, aligning along the radial direction of two slots arranged at unit coil intervals, inserting each end of each segment coil, and inserting one end of one segment coil into this, About the tip part on the other side of the other adjacent segment coils, the part protruding from the stator core is further bent along the circumferential direction of the stator core and the mutual tip parts are butted and connected to each other. It is a segment coil type phase coil that repeats sequentially for a plurality of segment coils to form a multi-turn unit coil, and is inserted into the same slot The number of segment coil segment coils and segment coils of the i-th coil (i + 1) th coil is preferably arranged alternately in the radial direction of the slot.

  Further, in the rotating electrical machine stator according to the present invention, the segment coil of the i-th coil inserted into the same slot and the segment coil of the (i + 1) -th coil adjacent thereto are in a direction to press each other in the slot. It is preferable that each has a curvature that generates an urging force.

  With the above configuration, when the rotating electrical machine stator forms a distributed winding phase winding by arranging 2n unit coils in a predetermined arrangement order in the circumferential direction of the stator core, the distributed winding phase winding is number 1 Since both of the two slots into which the coil strands of the coil are inserted are different from each other of the two slots into which the coil strands of the 2nth coil are inserted, different unit coils arranged in the same slot The potential difference between them can be made smaller than the in-phase potential difference, which is the voltage between the U phase and the neutral point.

  With the above configuration, in the rotating electrical machine stator, one of the two slots into which the coil element wire of the first coil is inserted is the same as one of the two slots into which the coil element wire of the nth coil is inserted. , One of the two slots into which the coil wire of the (n + 1) th coil is inserted is the same as one of the two slots into which the coil wire of the 2nth coil is inserted. By adopting such an arrangement order of the unit coils, the potential difference between different unit coils arranged in the same slot is made about half of the in-phase potential difference that is the voltage between the U phase and the neutral point. be able to.

  Further, in the rotating electrical machine stator, the distributed winding of each phase winding is inserted with the coil wire of the (i + 1) -th coil on the other side of the two slots into which the coil wire of the i-th coil is inserted. Same as one of the two slots. Thus, when one unit coil has been wound, the next unit coil can be wound from the slot. This eliminates the need for crossover wires and enables a small rotating electrical machine having a small volume of the winding portion.

  Further, in the rotating electrical machine stator, each of the distributed winding phase coils is a segment coil type each phase coil using a plurality of segment coils, and the segment coils of the i-th coil are (i + 1) and the plurality of segment coils inserted into the same slot. The segment coils of the No. coil are alternately arranged along the radial direction of the slot. The segment coil of the i-th coil inserted into the same slot and the segment coil of the (i + 1) -th coil adjacent to the i-th coil have curvatures that generate an urging force in the direction in which they are pressed against each other. As a result, different unit coils support each other in the same slot, so that the front ends of the segment coils are pressed against each other, and positioning for connection such as welding of the front ends is facilitated.

It is a figure explaining a mode that the distributed winding coil for 1 phase was wound in the rotary electric machine stator of embodiment which concerns on this invention. It is a figure which extracts and demonstrates the distributed winding coil for 1 phase in FIG. It is a figure explaining a mode that it wound to eight unit coils of a half among the 16 unit coils which comprise the distributed winding coil for 1 phase in FIG. It is a figure explaining a mode that eight unit coils of Drawing 3 were wound. FIG. 5 is a diagram illustrating a state in which the next eight unit coils are wound subsequent to FIG. 4. Here, illustration of the unit coil wound in FIG. 4 is omitted. It is a schematic diagram explaining the winding order of the distributed winding coil for 1 phase of FIG. It is a figure explaining the voltage difference between the different unit coils arrange | positioned in the same slot in the rotary electric machine stator of embodiment which concerns on this invention. It is a figure which extracts and demonstrates the distributed winding coil for 1 phase in a prior art for a comparison. It is a figure explaining a mode that it wound to eight unit coils of a half among the 16 unit coils which comprise the distributed winding coil for 1 phase in FIG. 8 of a prior art. It is a figure explaining a mode that eight unit coils of the prior art were wound. It is a schematic diagram explaining the winding order of the distributed winding coil for 1 phase of FIG. 8 of a prior art. FIG. 6 is a diagram for explaining a potential difference between different unit coils arranged in the same slot in a conventional rotating electrical machine stator. In the rotary electric machine stator of embodiment which concerns on this invention, it is a figure explaining a mode that a unit coil is formed using a segment coil, and a mode that a segment coil is inserted in a slot is shown here. FIG. 14 is a diagram for explaining a state in which each unit coil is formed by bending each segment coil, giving a curvature, and welding the distal end portion subsequent to FIG. 13.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, a three-phase synchronous rotating electric machine will be described as the rotating electric machine stator, but any stator including a distributed winding coil may be used. In the following description, the stator has 48 slots, and each phase winding is composed of 16 unit coils. However, the number of unit coils constituting each phase winding is other than this. However, the number of slots may be set accordingly. In the following, each unit coil will be described as being composed of five segment coils. However, this is only an example, and other number of segment coils may be used.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a perspective view illustrating a state of the rotating electrical machine stator 10. The rotating electrical machine stator 10 is a stator used in a three-phase rotating electrical machine mounted on a vehicle. The rotating electrical machine stator 10 is wound around the stator core 12 and a stator core 12 in which a plurality of annular electromagnetic steel plates are laminated. And three-phase windings. FIG. 1 shows a state in which a U-phase winding 20 corresponding to one phase of the three-phase windings is arranged. The slot 14 is a groove that opens on the inner peripheral side of the annular shape of the stator core 12, extends in the radial direction, and is arranged in a plurality in the circumferential direction, and each phase winding is arranged in a distributed winding form here. In FIG. 1, 48 slots 14 are arranged in the circumferential direction of the stator core 12, and U-phase windings 20 are arranged in 16 of them.

  FIG. 2 is a diagram showing the U-phase winding 20 arranged on the rotating electrical machine stator 10. The U-phase winding 20 is configured by combining 16 unit coils 21 each having a coil wire that is a conductor wire wound in a substantially hexagonal shape. In FIG. 2, C1 to C16 are coil numbers for distinguishing the 16 unit coils 21, and the unit coil C1 in which the winding start of the U-phase winding 20 is the first coil. This is a unit coil C16 which is the 16th coil.

  As can be seen from FIG. 2, the unit coil C2 is disposed immediately adjacent to the unit coil C1, and subsequently disposed adjacent to C3, C4, C5. The unit coil C16 is used. Accordingly, the unit coil C1 and the unit coil C9 are shifted by one slot but are partially overlapped. Similarly, the coil number is i and the i-th coil and the (i + 8) -th coil are shifted by one slot. Arranged so as to partially overlap.

  FIG. 3 is a diagram in which unit coils C <b> 1 to C <b> 8 are wound as a first half portion 22 that is a portion of eight unit coils in the first turn in the U-phase winding 20. It is. As shown here, each unit coil 21 is formed by winding a coil wire in the same shape five times.

  4 and 5 are schematic diagrams for explaining the order in which the unit coils 21 are arranged in the first half portion 22 and the subsequent second half portion 24 shown in FIG. Here, a plan view of the stator core 12 and a state of connection between the unit coils 21 are schematically shown on the outside thereof. The 48 slots 14 of the stator core 12 are given slot numbers for distinguishing them within a range necessary for explanation. The slot numbers assigned to the stator cores 12 in FIGS. 4 and 5 are only numbers 1 to 48 because there is little space to be described. In the following, the slot numbers are represented by S1 to S48 and S. A description will be given with symbols. Note that the slot numbering method described below is an example, and of course, other numbering methods may be used. In the following, the symbol 14 of the slot 14 is omitted as appropriate in order to avoid confusion with the slot number. Similarly, the symbol 21 of the unit coil 21 is omitted as appropriate to avoid being confused with the unit coil number.

  In the case of distributed winding, the coil wire 23 is arranged across a predetermined slot interval. This predetermined slot interval defines the hexagonal outer shape of the unit coil 21 and will be referred to as a unit coil interval 26. 4 and 5, the unit coil interval 26 is an interval of 6 slots. That is, one unit coil 21 is formed by winding the coil wire 23 five times over the 6-slot interval which is the unit coil interval 26.

  Unit coil C <b> 1 is a unit coil at the beginning of winding of U-phase winding 20. Since the winding start of the U-phase winding 20 is connected to the power line of the rotating electrical machine, FIG. 4 shows the winding start of the U-phase winding 20 as IN (power line). In the winding start unit coil C1, the coil wire 23 is wound 5 times between the slot S4 and the slot S10. The winding start connected to IN (power line) in FIG. 4 is the outer peripheral side of the stator core 12 in the slot S4. If the front side of the paper surface of FIG. 4 is the front side of the stator core 12, and the back side of the paper surface of FIG. 4 is the back side of the stator core 12, the coil wire 23 is positioned from the position of the slot S4 indicated as IN at the beginning of winding of the unit coil C1. And on the back side of the stator core 12, the unit coil interval 26 is passed from the slot S4 to the slot S10.

  Then, the slot S10 rises from the back side of the stator core 12 to the front side, and crosses the unit coil interval 26 from the slot S10 to the slot S4 on the front side of the stator core 12. In the slot S4, the stator core 12 again falls from the front side to the back side. Then, on the back side of the stator core 12, the unit coil interval is shifted from the slot S4 to the slot S10 by shifting the position to the inner peripheral side of the stator core 12 so as not to overlap the coil wire 23 extending from the slot S4 to the slot S10. Cross 26.

  In the slot S10, it rises again from the back side of the stator core 12 to the front side. Then, on the front side of the stator core 12, the unit coil interval is shifted from the slot S10 to the slot S4 by shifting the position to the inner peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S10 to the slot S4. Cross 26.

  By repeating this, the coil wire 23 is wound five times between the slot S4 and the slot S10, and the formation of the unit coil C1 is completed, but the end of the winding of the unit coil C1 is on the innermost circumferential side of the stator core 12. The back side. The coil wire 23 crosses the innermost peripheral side of the stator core 12 from the slot S4 to the slot S10 by a unit coil interval, goes up the slot S10, exits to the front side of the stator core 12, and starts winding the unit coil C2. In this way, the unit coil C1 and the unit coil C2 are adjacently connected. In FIG. 4, the winding direction of the coil winding 23 is indicated by a black dot mark and an X mark in a circle so that the connection between the unit coils can be easily understood. A black dot mark indicates that the coil winding 23 goes out from the front side of the stator core 12 to the back side, and an X mark shows a case where the coil winding 23 goes out from the back side of the stator core 12 to the front side.

  The unit coil C2 extends from the slot S10 to the slot S16 by the unit coil interval 26 on the front side of the stator core 12 from the beginning of winding. As described later, when the unit coil C1 moves to the unit coil C2, the unit coil 21 uses a plurality of segment coils as coil strands 23 and connects adjacent segment coils. This is because this is performed on the front side of the stator core 12.

  After crossing the slot S16 in the unit coil C2, the unit coil C2 descends from the front side to the back side of the stator core 12 in the slot S16, and crosses the unit coil interval 26 from the slot S16 to the slot S10 on the back side of the stator core 12. In the slot S10, it rises again from the back side of the stator core 12 to the front side. Then, on the front side of the stator core 12, the unit coil interval 26 is shifted from the slot S10 to the slot S16 by shifting the position to the outer peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S10 to the slot S16. Just cross over.

  In the slot S16, the stator core 12 again falls from the front side to the back side. Then, on the back side of the stator core 12, the unit coil interval 26 is shifted from the slot S16 to the slot S10 by shifting the position to the outer peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S16 to the slot S10. Just cross over.

  By repeating this, the coil wire 23 is wound five times between the slot S10 and the slot S16, and the formation of the unit coil C2 is finished. However, the end of the winding of the unit coil C2 is the maximum of the stator core 12 in the slot S16. On the outer periphery side, it is the back side. Then, the coil wire 23 crosses the outermost peripheral side of the stator core 12 from the slot S16 to the slot S22 by a unit coil interval, rises up the slot S22, exits to the front side of the stator core 12, and starts winding the unit coil C3. In this way, the unit coil C2 and the unit coil C3 are adjacently connected.

  Thus, the unit coil C1 winds the coil wire 23 five times from the outer peripheral side to the inner peripheral side of the stator core 12, and the connection between the unit coil C1 and the unit coil C2 is the back side of the innermost peripheral side of the stator core 12. This is done by moving the coil wire 23 from the slot S4 to the slot S10. The unit coil C2 is wound around the coil wire 23 five times from the inner peripheral side to the outer peripheral side of the stator core 12, and the unit coil C2 and the unit coil C3 are connected to each other on the back side of the outermost peripheral side of the stator core 12. This is done by crossing line 23 from slot S16 to slot S22.

  Thereafter, when the same winding is repeated from the unit coil C3 to the unit coil C8, the winding end of the unit coil C8 comes to the front side from the slot S46 on the outermost peripheral side of the stator core 12, as shown in FIG. The first half portion 22 of the U-phase winding 20 ends.

  FIG. 5 is a diagram showing the winding order of the latter half portion 24 of the U-phase winding 20. Here, the winding end of the unit coil C8 described in FIG. 4 is the winding start of the unit coil C9.

  The unit coil C9 is shifted by one slot from the unit coil C1, and the coil wire 23 is wound five times between the slot S3 and the slot S9. As described above, since the end of winding of the unit coil C8 has just come out from the slot S46 on the outermost peripheral side of the stator core 12, the unit coil C9 is lowered from the front side to the back side of the stator core 12 in the slot S3. Begins. Then, on the back side of the stator core 12, the unit coil interval 26 extends from the slot S3 to the slot S9.

  In the slot S9, the stator core 12 rises from the back side to the front side, and on the front side of the stator core 12, the unit coil interval 26 is passed from the slot S9 to the slot S3. In the slot S3, the stator core 12 again falls from the front side to the back side. Then, on the back side of the stator core 12, the unit coil interval is shifted from the slot S3 to the slot S9 by shifting the position to the inner peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S3 to the slot S9. Cross 26.

  In the slot S9, it again rises from the back side of the stator core 12 to the front side. Then, on the front side of the stator core 12, the unit coil interval is shifted from the slot S9 to the slot S3 by shifting the position to the inner peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S9 to the slot S3. Cross 26.

  By repeating this, the coil wire 23 is wound five times between the slot S3 and the slot S9 to complete the formation of the unit coil C9. The end of the winding of the unit coil C9 is on the innermost circumference side of the stator core 12. The back side. The coil wire 23 crosses the innermost circumferential side of the stator core 12 from the slot S3 to the slot S9 by a unit coil interval, goes up the slot S9, exits to the front side of the stator core 12, and starts winding the unit coil C10. In this way, the unit coil C9 and the unit coil C10 are adjacently connected.

  Thereafter, the same procedure as described with reference to FIG. 4 is performed by shifting by one slot, and when the same winding is repeated from the unit coil C10 to the unit coil C16, the winding end of the unit coil C16 is the outermost peripheral side of the stator core 12. Thus, it comes out from the slot S45 to the front side. This is the end of winding of the U-phase winding 20 and is connected to the neutral point of the rotating electrical machine. In FIG. 5, the end of winding of the unit coil C16 is shown as OUT (neutral point).

FIG. 6 is a diagram schematically illustrating the entire winding sequence described in FIGS. 4 and 5. Here, it is shown between which slot each unit coil is wound. As shown here, the unit coil C1 is wound between the slot S4 and the slot S10, the unit coil C2 is wound between the slot S10 and the slot S16, and the unit coil C3 is between the slot S16 and the slot S22. The unit coil C4 is wound between the slot S22 and the slot S28, and the unit coil C15 is wound between the slot S39 and the slot S45. The unit coil C16 is wound between the slot S45 and the slot S45. Wound during S3.

  Accordingly, assuming that the coil number is i, the other side of the two slots into which the coil wire 23 of the i-th coil is inserted is one of the two slots into which the coil wire 23 of the (i + 1) -th coil is inserted. Same as side.

  Here, paying attention to the slot into which the unit coil C1 at the beginning of winding and the unit coil C16 at the end of winding of the U-phase winding 20 are inserted, the two slots into which the coil wires 23 of the unit coil C1 are inserted are S4 and In S10, the two slots into which the coil wire 23 of the unit coil C16 is inserted are S3 and S9, both of which are different slots.

  Also, assuming that the total number of unit coils 21 is 2n, one of the two slots into which the coil element wire 23 of the first coil at the start of winding is inserted is one of the two slots into which the coil element wire 23 of the nth coil is inserted. One of the two slots into which the coil wire 23 of the (n + 1) th coil is inserted is the same as one of the two slots into which the coil wire 23 of the 2nth coil is inserted. is there.

  In the above, assuming that 2n = 16, one of the two slots into which the coil wire 23 of the unit coil C1 is inserted, and the coil wire 23 of the unit coil C8 that is the nth coil is inserted into the slot S4. A unit coil which is the same as one of the two slots and in which one of the two slots into which the coil wire 23 of the unit coil C9 which is the (n + 1) th coil is inserted is a slot 2 which is the 2nth coil. This is the same as one of the two slots into which the C16 coil wire 23 is inserted.

  FIG. 7 is a diagram for explaining the operation of the above configuration. Here, a state in which each phase winding of the three-phase rotating electrical machine is Y-connected is shown. In the above configuration, an in-phase potential difference from a drive circuit (not shown) is applied between the unit coil C1 that is the start of winding of the U-phase winding 20 and the unit coil C16 that is the end of winding. For example, in the case of a rotating electric machine driven at a high voltage and high power with a U-V phase potential difference of 600 V, the in-phase potential difference, which is the potential difference between the U phase and the neutral point, is 400 V, and this 400 V is the unit coil C1. And the unit coil C16.

  As described above, the unit coil C1 is wound in the slot S4 and the slot S10. A unit coil C8 is disposed in the slot S4 together with the unit coil C1. A unit coil C1 and a unit coil C2 are arranged in the slot S10. Since the unit coil C1 and the unit coil C2 are adjacent unit coils, the potential difference between the two unit coils in the slot S10 is small. The potential difference between the unit coil C1 and the unit coil C8 arranged in the slot S4 is about half of the in-phase potential difference because the unit coil C8 is approximately halfway between the start and end of winding of the U-phase winding 20. In the above example, it is about 200V.

  Further, regarding the unit coil C16, it is the slots S45 and S3 that are wound. A unit coil C9 is disposed in the slot S3 together with the unit coil C16. A unit coil C16 and a unit coil C15 are arranged in the slot S45. Since the unit coil C16 and the unit coil C15 are adjacent unit coils, the potential difference between the two unit coils in the slot S45 is small. The potential difference between the unit coil C16 and the unit coil C9 arranged in the slot S3 is about half of the in-phase potential difference because the unit coil C9 is approximately halfway between the start and end of winding of the U-phase winding 20. In the above example, it is about 200V.

  Thus, according to the above configuration, the potential difference between two different unit coils arranged in each slot around which the U-phase winding 20 is wound is suppressed to about half of the in-phase potential difference at the maximum.

  The above operation is further clarified by comparing with the arrangement method of the unit coil of the distributed winding of the prior art. 8 to 12 are diagrams for explaining the state of distributed winding in the prior art.

  FIG. 8 is a view corresponding to FIG. 2, in which a U-phase winding 30 according to the prior art disposed in the rotating electrical machine stator 10 is extracted and shown. FIG. 9 is a diagram in which eight unit coils 21 in the second turn, which is the latter half portion 34, are extracted from the two-round arrangement of the U-phase winding 30 in FIG. The U-phase winding 30 is composed of a first half portion 32 and a second half portion 34 that are not particularly labeled here. 2 to 6, the total number of slots 14 of the stator core 12, the total number of unit coils 21 constituting the U-phase winding 30 is 16, and the number of turns constituting each unit coil 21 is 5, respectively. As the same.

  In the distributed winding according to the prior art, the eight unit coils 21 and the latter half portion 34 constituting the first half portion 32 are arranged so that the current flowing direction is symmetrical between the first half portion 32 and the latter half portion 34 of the U-phase winding 30. 8 unit coils 21 are alternately arranged, and the winding directions are opposite to each other.

  Therefore, for example, in the first half portion 32, as shown in FIG. 8, the unit coil C1 and the unit coil C5 are arranged so as to be shifted from each other by one slot, and similarly, the unit coil C2 and the unit coil C6 are also united. The coil C3 and the unit coil C7 as well as the unit coil C4 and the unit coil C8 are also arranged so as to be shifted from each other by one slot. Further, as shown in FIG. 8, the arrangement order of the numbers of the unit coils 21 is such that the unit coils C1 to C8 of the first half portion 32 rotate counterclockwise toward the paper surface, whereas the unit coils of the second half portion 34 are arranged. From C9 to C16, it rotates clockwise as shown in FIG. This makes the direction of current flow symmetrical.

  9, the unit coils C9 and C13 and the unit coils C12 and C16 are separated by a unit coil interval 26 so that the unit coils C1 and C5 of the first half are arranged. The Similarly, unit coils between the unit coils C12 and C16 and the unit coils C11 and C15, between the unit coils C11 and C15 and the unit coils C10 and C14, and between the unit coils C10 and C14 and the unit coils C9 and C13 are also unit coils. They are separated by an interval 26. In this way, the unit coil 21 is separated from the next unit coil 21 by the unit coil interval 26, so that the connection is made with a connection line called a crossover line 36.

  Each crossover 36 in FIG. 9 is provided avoiding the arrangement of the unit coil 21 because the unit coil 21 of the first half portion 32 is arranged there. Similarly, the connecting wire 36 is provided in the first half portion 32, and the connecting wire 36 is also provided in the V-phase winding and the W-phase winding not described here. As described above, since the large number of crossover wires 36 are arranged so as to avoid the unit coils 21, the volume of the winding portion of the rotating electrical machine stator 10 is increased. On the other hand, since the connecting wire is not necessary in the configurations of FIGS. 2 and 3, the volume of the winding portion of the rotating electrical machine stator 10 can be further reduced, and a small rotating electrical machine stator can be obtained.

  FIG. 10 is a schematic diagram for explaining the state in which the 16 unit coils constituting the U-phase winding 30 of the prior art are wound in which slot of the stator core 12. This figure is a plan view of the stator core 12, and only the numerals indicating the slot numbers are shown in the slots of the stator core 12, as in FIGS. On the outside of the stator core 12, the state in which each unit coil is wound indicates the slot number and whether the winding is lowered from the front side to the back side or raised from the back side to the front side.

  For example, the unit coil C1 is wound between the slot S4 and the slot S10. In the slot S4, the coil wire 23 is lowered from the front side of the stator core to the back side, and in the slot S10, the coil wire 23 is lowered from the back side of the stator core to the front side. Similarly, the unit coil C2 is wound between the slot S40 and the slot S46. In the slot S40, the coil wire 23 is lowered from the front side of the stator core to the back side, and in the slot S46, the coil wire 23 is lowered from the back side of the stator core to the front side. Here, the unit coil C1 and the unit coil C2 are connected by a crossover wire 36, but the crossover wire 36 is not shown in FIG. Hereinafter, the winding of other unit coils is shown in the same notation.

  As shown in FIG. 10, the unit coil C1 is disposed between the unit coil C13 and the unit coil C16. That is, for the two slots S4 and S10 into which the coil wire 23 of the unit coil C1 is inserted, the coil wire 23 of the unit coil C16 is also inserted into the slot S4, and the coil element of the unit coil C13 is inserted into the slot S10. Line 23 is also inserted.

  FIG. 11 is a diagram schematically illustrating the entire winding order of the U-phase winding 30 of the prior art described in FIG. Here, as in FIG. 4, it is shown between which slot each unit coil is wound. As shown here, the winding start unit coil C1 indicated as IN is wound between the slot S10 and the slot S4, and the unit coil C2 is connected to the unit coil C16 from the unit coil C1 by using the crossover 36. It is wound between the slot S46 and the slot S40 so as to be disposed between the unit coils C15. The unit coil C3 is wound between the slot S34 and the slot S28 so as to be disposed between the unit coil C15 and the unit coil C14 using the crossover wire 36.

  Hereinafter, as shown in FIG. 11, winding is performed sequentially from the unit coil C <b> 4 to the unit coil C <b> 16 in the predetermined arrangement order using the jumper wires 36. The unit coil C16 is wound between the slot S46 and the slot S4 so as to be disposed between the unit coil C2 and the unit coil C1 using the crossover wire 36 from the unit coil C15. The end of the unit coil C16 is the end of winding and is shown as OUT.

  Thus, in the distributed winding of the prior art, the unit coil C1 which is the start of winding of the U-phase winding 30 is wound between the slot S10 and the slot S4, and the unit coil C16 which is the end of winding is the slot S46 and the slot. It is wound between S4. That is, the unit coil C1 at the beginning of U-phase winding and the unit coil C16 at the end of winding are arranged in the slot S4.

  This is shown in FIG. 12 corresponding to FIG. As shown in FIG. 12, the potential difference between the unit coil C1 and the unit coil C16 arranged in the slot S4 is an in-phase potential difference that is a potential difference between the U phase and the neutral point. Thus, in the configuration of the distributed winding of the prior art, the potential difference between different unit coils arranged in the same slot is the same as the in-phase potential difference. On the other hand, in the configuration described with reference to FIGS. 2 to 6, as described with reference to FIG. 7, the potential difference between different unit coils arranged in the same slot is suppressed to half of the intra-phase potential difference at the maximum.

  Next, winding of the coil wire 23 in each unit coil 21 having the configuration shown in FIGS. 4 and 5 will be described. In the rotating electrical machine stator 10, when the number of slots is small, each phase winding by the distributed winding method may be sequentially wound around a predetermined slot in a predetermined arrangement order using continuous conductor wires. Good. However, when the number of slots increases, it may become difficult to sequentially wind a continuous conductor wire around a predetermined slot. In such a case, a segment coil is used as the coil wire 23.

  The segment coil is a member that is arranged at the same interval as the unit coil interval 26 by bending both ends of one conductor wire. The manner of forming each phase winding using a segment coil will be described with reference to FIGS. FIGS. 13 and 14 are a top view, a cross-sectional view, and a side cross-sectional view along the line AA shown in the top view of the rotating electric machine stator 10 around the unit coil C2 described in FIG. Here, a slot S10 and a slot S16 around which the unit coil C2 is wound are shown, and the five segment coils 50 correspond to the winding of the unit coil C2 from the inner peripheral side to the outer peripheral side of the stator core 12. A state of being arranged toward is shown.

  In FIG. 13, as the segment coil 50, five U-shaped so as to be arranged at the same interval as the unit coil interval 26 by bending both ends of one conductor wire, the unit coil interval 26 is used. A state in which both ends of each segment coil 50 are inserted in alignment along the radial direction of the two slots arranged in FIG. That is, both ends of the U-shaped segment coil 50 are inserted into the slots S10 and S16, respectively. The five segment coils 50 are aligned in the radial direction of the stator core 12 in the slots S10 and S16.

  The slot S10 and the slot S16 are two slots around which the unit coil C2 is wound, and the interval is a unit coil interval 26. 4 to 6, the unit coil C2 and the unit coil C1 are arranged in the slot S10, and the unit coil C2 and the unit coil C3 are arranged in the slot S16.

  Correspondingly, in slot S10, one side of both ends of segment coil 50 for unit coil C2 and the other side of both ends of segment coil 52 for unit coil C1 are arranged. The arrangement is performed such that the segment coils 50 and the segment coils 52 alternate along the radial direction of the slot S10. Similarly, the other side of both ends of the segment coil 50 for the unit coil C2 and one side of both ends of the segment coil 54 for the unit coil C3 are arranged in the slot S16. This arrangement is also performed so that the segment coils 50 and the segment coils 52 alternate along the radial direction of the slot S16.

  Note that the arrangement of the segment coils 50, 52, and 54 along the radial direction of the stator core 12 is arranged in parallel with the inner peripheral outline of the stator core 12, as shown in FIG. Rather, an alignment arrangement that is slightly inclined with respect to the inner peripheral outline is taken.

  FIG. 14 is a diagram illustrating a state in which five segment coils 50 are connected to each other to form one unit coil C2 wound five times as a continuous winding. Here, with respect to the one end portion of one segment coil 50 and the other end portion of the other segment coil 50 adjacent thereto, the portions protruding from the stator core 12 are further relative to each other along the circumferential direction of the stator core 12. Are bent and connected to each other with their tip portions abutted against each other.

  Specifically, in the top view of FIG. 14, five stator cores 12 are directed from the inner peripheral side toward the outer peripheral side, that is, from the side where the slots S10 and S16 are opened toward the side where the slots S10 and S16 are closed. For each of the segment coils 50, one side 62 of both ends thereof, that is, one side 62 which is initially inserted into the slot S 10 and protrudes to the front side of the stator core 12, is formed in the slot S 16 along the circumferential direction of the stator core 12. Folded sideways. Further, the other side of both ends of the same segment coil 50, that is, the other side 64 that is initially inserted into the slot S 16 and protrudes to the front side of the stator core 12 is the slot S 10 side along the circumferential direction of the stator core 12. It is bent toward

  In this way, at both ends of the five segment coils 50, the portions protruding from the stator core 12 are relatively bent along the circumferential direction of the stator core 12, and the bent one side 62 and the other side 64 face each other. . In this state, the segment coils 50 each have a substantially hexagonal outer shape and remain separated from each other. In order to connect them to each other to form one unit coil C2 wound five times, the tip 66 of one side 62 of one segment coil 50 and the other side 64 of the segment coil 50 adjacent thereto are arranged. It is necessary to connect the tip portion 68 facing each other.

  Since the segment coils 50 are simply arranged sequentially in the radial direction in the slot, the arrangement relationship between one segment coil 50 and the segment coil 50 adjacent thereto is not determined as it is. That is, the positioning between the distal end portion 66 on one side 62 of one segment coil 50 and the distal end portion 68 on the other side 64 of the segment coil 50 adjacent thereto is not determined as it is.

  Therefore, as shown in FIG. 14, the one side 62 of each segment coil 50 bent along the circumferential direction of the stator core 12 is further bent obliquely toward the outer circumferential side along the radial direction of the stator core 12 and bent. The other side 64 bent along the circumferential direction 12 is further bent obliquely toward the inner circumferential side along the radial direction of the stator core 12.

  As shown in FIG. 14, the angle of bending is such that the tip portion 66 on one side 62 of one segment coil 50 and the tip portion 68 on the other side 64 of the segment coil 50 adjacent thereto are just facing each other. To overlap. Specifically, the tip portion 66 and the tip portion 68 are brought into contact with each other. A position where the tip portion 66 and the tip portion 68 are overlapped face to face is a connection position between the adjacent segment coils 50. As shown in FIG. 14, five connection positions are formed along the radial direction of the stator core 12 at intermediate positions between the slots S10 and S16. And the magnitude | size of diagonal bending is set so that the space | interval between these five connection positions may become the same.

  For example, when the groove depth along the radial direction of the slot is L, in order to arrange the five segment coils 50 at equal intervals, the interval can be set to L / 5. Therefore, the magnitude of the oblique bending can be set to a value corrected in consideration of the thickness of the segment coil 50 with reference to L / 10. By obliquely bending in this manner, the end portions 66 and 68 at both ends of each segment coil 50 can be offset from the initial position, and a wide interval 70 between the connection positions can be secured.

  Each connection position is connected by an appropriate connection means such as a welding means. As a result, the adjacent segment coils 50 in the five segment coils 50 are sequentially connected to each other to form a unit coil C2 wound continuously five times as a whole.

  As described above, the other side of both ends of the five segment coils 52 of the unit coil C1 and one end of both ends of the five segment coils 50 of the unit coil C2 are arranged in the slot S10. The In the slot S16, the other side of both ends of the five segment coils 50 of the unit coil C2 and one end of both ends of the five segment coils 54 of the unit coil C3 are arranged. Here, as shown in the sectional side view along the line AA in FIG. 14, the segment coil of the i-th coil inserted into the same slot and the segment coil of the (i + 1) -th coil adjacent thereto are Within the slot, each has a curvature that generates an urging force in a direction of pressing each other.

  Referring to the slot S16 of FIG. 14, the segment coil 50 constituting the unit coil C2 has a bent shape 72 having a curvature that swells toward the outer peripheral side of the stator core 12 in the slot S13. The segment coil 54 constituting the unit coil C3 has a bent shape 74 having a curvature that swells toward the inner peripheral side of the stator core 12 in the slot S13.

  The magnitude of the curvature is set so that the bent shape 72 and the bent shape 74 are in contact with each other to generate an urging force. As a result, different unit coils 21 support each other in the same slot, so that the front ends of the segment coils are pressed against each other, and positioning for welding of the front ends is facilitated.

  The rotating electrical machine stator according to the present invention can be used for a rotating electrical machine stator including cloth winding phase windings.

  10 rotating electric machine stator, 12 stator core, 14 slots, 20, 30 U-phase winding, 21 unit coil, 22, 32 first half part, 23 coil strand, 24, 34 second half part, 26 unit coil interval, 36 crossover wire, 50, 52, 54 Segment coil, 59, 66, 68 Tip, 62, 69 One side, 64 The other side, 70 Connection position spacing, 72, 74 Bending shape.

Claims (4)

A stator core disposed along the circumferential direction, each having a plurality of slots extending in the radial direction;
2n unit coils are arranged in a predetermined arrangement order in the circumferential direction of the stator core, with a predetermined slot interval as a unit coil interval and a coil formed by winding a coil wire at a unit coil interval as a unit coil. Each of the distributed windings formed,
Including
Distributed winding each phase winding
The unit coil at the beginning of winding is the 1st coil, the unit coil at the end of winding is the 2nth coil, and the coil wire of the 2nth coil is inserted into each of the two slots into which the coil wire of the 1st coil is inserted. any original two slots that, unlike one another, one of the two slots in which the coil wire of No. 1 coil is inserted, one of the two slots in which the coil wire of the n-th coil is inserted are the same, (n + 1) th one of the two slots in which the coil wire of the coil is inserted, wherein one same der Rukoto of the two slots in which the coil wire of 2n-th coil is inserted Rotating electric machine stator. In the rotating electrical machine stator according to claim 1,
Distributed winding each phase winding
The other side of the two slots into which the coil wire of the i-th coil is inserted is the same as one side of the two slots into which the coil wire of the (i + 1) -th coil is inserted. Rotating electric machine stator. The rotating electrical machine stator according to claim 2,
Distributed winding each phase coil
As a coil wire, a plurality of segment coils which are bent at both ends of one conductor wire and arranged at the same interval as the unit coil interval, and the radial direction of two slots arranged at the unit coil interval are used. A portion protruding from the stator core with respect to one end of one segment coil and the other end of another segment coil adjacent to the segment coil. Are further bent along the circumferential direction of the stator core, the tip portions of each other are butted and connected, and this is sequentially repeated for a plurality of adjacent segment coils to form a multi-turn unit coil. Each phase coil,
For a plurality of segment coils inserted into the same slot, the segment coil of the i-th coil and the segment coil of the (i + 1) -th coil are alternately arranged along the radial direction of the slot. Child. In the rotating electrical machine stator according to claim 3,
The segment coil of the i-th coil inserted into the same slot and the segment coil of the (i + 1) -th coil adjacent to the i-th coil have curvatures that generate urging forces in the direction of pressing each other. Rotating electric machine stator.

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