JP2014103707A - Stator of rotary electrical machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electrical machine, capable of reducing a maximum potential difference between conductor segments composing a coil.SOLUTION: A stator coil is formed by inserting a plurality of conductor segments from one side in an axial direction of a stator core 120 to the other side so that the plurality of conductor segments are arranged along a radial direction of two slots 160 arranged in a unit coil interval, offsetting and folding leg parts of the conductor segments projected from an end surface of the other side in the axial direction and mutually connecting the leg parts of the conductor segments in unit coils adjacent to each other in the radial direction. An element wire of a winding start conductor segment 1 and an element wire of a winding end conductor segment 24 are arranged in the same slot S1. An element wire of another conductor segment 2 is arranged between the element wire of the winding start conductor segment 1 and the element wire of the winding end conductor segment 24.

Description

  The present invention relates to a stator for a rotating electrical machine, and more particularly to a stator having a conductor segment winding structure.

  2. Description of the Related Art A rotating electric machine is known that includes a stator in which a plurality of stator coils are wound around an inner periphery of an annular stator core. For example, in a three-phase synchronous rotating electric machine, U-phase, V-phase, and W-phase stator coils are wound around a stator core. A plurality of teeth projecting in the radial direction are formed at predetermined intervals in the circumferential direction on the inner circumferential portion of the stator core, and slots are formed between the teeth adjacent in the circumferential direction. The stator coil of each phase is configured by inserting a conducting wire into a slot of the stator core and winding it around the teeth, one end of which is connected to an input point that is a connection point of the power supply lead wire, and the other end The part is connected to a neutral point which is a connection point with the stator coil of the other phase.

  As a method of winding a coil, distributed winding is known in which a stator coil is wound using two slots separated from each other in the circumferential direction. As this stator coil, a plurality of U-shaped conductor segments each having leg portions at both ends are inserted into a plurality of slots from one side of the stator core in the axial direction to the other side, and from the end surface on the other side in the axial direction. It is also considered to form a segment coil by bending the protruding leg portion in the radial direction and bending it, and connecting the leg portions of the conductor segments adjacent in the radial direction to form a coil.

  For example, in Patent Literature 1, a plurality of conductor segments are connected to form a coil, a plurality of unit coils are provided, and a plurality of unit coils are connected in the circumferential direction of the stator core to connect each phase stator. It is disclosed to constitute a coil. In the rotating electrical machine described in Patent Document 1, in order to suppress a voltage difference between different unit coils arranged in the same slot, the winding start unit coil and the winding end unit coil are arranged in different slots, respectively. Has been.

JP2012-16195A

  When distributed winding is adopted in the conductor segment winding structure, when a plurality of unit coils make one or more rounds along the circumferential direction of the stator core to produce a stator coil of a certain phase, the element of the conductor segment at the beginning of winding is used. The wire and the strand of the end-of-winding conductor segment may be placed adjacent to each other in the same slot. In this case, the potential difference between the element wire of the winding start conductor segment and the element wire of the winding end conductor segment becomes the maximum value of the potential difference generated between the conductor segments. Due to the potential difference, a partial discharge is generated, and the coating of the coil is eroded and may eventually cause dielectric breakdown.

  The objective of this invention is providing the stator of the rotary electric machine which can reduce the maximum electric potential difference between the conductor segments which comprise a coil.

  The present invention includes an annular stator core having a plurality of teeth extending inward in the radial direction, in which slots are formed between adjacent teeth, and a predetermined slot interval as a unit coil interval, and the stator core at a unit coil interval. A unit coil formed by winding a plurality of strands in a predetermined arrangement order in the radial direction of each, using U-shaped conductor segments having legs at both ends as the strands, and unit coil spacing The plurality of conductor segments are inserted from one side of the stator core in the axial direction to the other side so that the plurality of conductor segments are arranged along the radial direction of the two slots arranged in the The legs protruding from the other end face are offset and bent in the radial direction to connect the legs of the conductor segments in the unit coils adjacent in the radial direction. A stator coil for repeating a plurality of adjacent conductor segments in order to form a unit coil of a plurality of turns, and a strand of a conductor segment at the beginning of winding of the stator coil, and a conductor coil at the end of winding. A stator of a rotating electrical machine in which a strand is disposed in the same slot, and a strand of another conductor segment is disposed between the strand of the conductor segment at the beginning of winding and the strand of the conductor segment at the end of winding. It is the stator of the rotary electric machine characterized by the above-mentioned.

  The present invention also includes an annular stator core having a plurality of teeth extending inward in the radial direction, in which slots are formed between adjacent teeth, and a predetermined slot interval as a unit coil interval. A unit coil is formed by winding a plurality of strands in a predetermined arrangement order in the radial direction of the stator core, and U-shaped conductor segments having leg portions at both ends are used as the strands. A plurality of conductor segments are inserted from one side of the stator core in the axial direction to the other side so that the plurality of conductor segments are arranged along the radial direction of the two slots arranged at the coil interval, and the axial direction The leg portions protruding from the other end face of the wire are offset and bent in the radial direction, and the leg portions of the conductor segments in the unit coils adjacent in the radial direction are And a stator coil that forms a plurality of turns of a unit coil by repeating this operation sequentially for a plurality of adjacent conductor segments, where N is the number of conductor segments arranged in the slot. The number of strands of the unit coil is [(N / 2) -1] and [(N / 2) +1], and the first slot group through which one leg portion of the unit coil passes is outside the stator core. In the second slot group in which the strands of two adjacent conductor segments are arranged on the radial side and the other leg portion of the unit coil penetrates, the strands of two adjacent conductor segments on the inner diameter side of the stator core. Is a stator of a rotating electrical machine.

  According to the present invention, since the strands of the conductor segment at the beginning of winding and the strands of the conductor segment at the end of winding are arranged without being adjacent in the same slot, the maximum potential difference between the conductor segments can be reduced. .

It is the top view which looked at the stator which concerns on embodiment of this invention from the one side (anti-lead side) of the axial direction. It is the top view which looked at the stator which concerns on embodiment of this invention from the other side (lead side) of the axial direction. It is a figure which shows the typical connection relation of the stator coil which concerns on embodiment of this invention. It is a figure which shows the typical connection relation of the stator coil which concerns on a modification. It is the top view which looked at the stator which concerns on a prior art from the one side (anti-lead side) of the axial direction. It is the top view which looked at the stator which concerns on a prior art from the other side (lead side) of the axial direction. It is a figure which shows the typical connection relation of the stator coil which concerns on a prior art.

  With reference to FIG.1 and FIG.2, the stator of the rotary electric machine which concerns on embodiment of this invention is demonstrated. FIG. 1 is a plan view of a part of the stator as viewed from one side (anti-lead side) of the stator core in the axial direction, and FIG. 2 is a part of the stator as viewed from the other side (lead side) in the axial direction. It is a top view. The rotating electrical machine according to the present embodiment is a three-phase synchronous rotating electrical machine as an example, and is mounted on a vehicle such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle.

  The rotating electrical machine according to the present embodiment includes a stator 100 and a rotor (not shown). The stator 100 includes an annular stator core 120 that is a laminate of a plurality of electromagnetic steel plates. The stator 100 includes a plurality of teeth 140 that protrude in the radial direction on the inner peripheral portion of the stator core 120 and are arranged in the circumferential direction at predetermined intervals. ing. A slot 160 is formed between the teeth 140 adjacent in the circumferential direction. The stator 100 is wound with U-phase, V-phase, and W-phase stator coils. The rotor (not shown) includes a rotor core that is a laminate of a plurality of electromagnetic steel plates and a permanent magnet, and is disposed inside the stator core 120.

  The stator coil according to the present embodiment is a unit coil formed by winding a plurality of wires in a predetermined arrangement order in the radial direction of the stator core 120 at a unit coil interval with a predetermined slot interval as a unit coil interval. Become. The stator 100 according to the present embodiment employs a conductor segment winding structure, and for example, U-shaped conductor segments 180 each having leg portions at both ends are used as the strands. Further, distributed winding is adopted as a method of winding the stator coil.

  Specifically, one axial side of the stator core 120 shown in FIG. 1 is arranged such that a plurality of U-shaped conductor segments 180 are arranged along the radial direction of two slots 160 arranged at unit coil intervals. The leg portions of the plurality of conductor segments 180 are inserted into the other side. Then, the leg portions of the conductor segment 180 protruding from the other end face in the axial direction of the stator core 120 shown in FIG. 2 are bent by offsetting in the radial direction, and the leg portions of the conductor segments 180 in the unit coils adjacent in the radial direction are bent. Connect. This is repeated for a plurality of adjacent conductor segments 180 to form a stator coil. One end of each phase of the stator coil is connected to an input point that is a connection point of a lead wire for power supply, and the other end is connected to a neutral point that is a connection point with the stator coil of another phase. In the present embodiment, lead wires are connected to the stator coils of the respective phases on the other axial side of the stator core 120 shown in FIG. Accordingly, FIG. 2 corresponds to the lead side of the stator core 120, and FIG. 1 corresponds to the opposite lead side of the stator core 120.

  In the example shown in FIGS. 1 and 2, 48 slots 160 are formed in the stator core 120. In each slot 160, six conductor segments 180 are arranged in the radial direction, and the number of turns of the coil is six. In addition, U-phase, V-phase, and W-phase stator coils are arranged in 16 slots 160, respectively. For ease of explanation, FIGS. 1 and 2 show only a part of the conductor segments 180 constituting a one-phase stator coil as a schematic connection relationship. S1 to S48 in the figure are slot numbers for distinguishing 48 slots 160. The numbers such as 1, 2, 3,... Shown in the conductor segments 180 are numbers for distinguishing the conductor segments 180 inserted into the respective slots 160. In the following description, the conductor segment at the beginning of winding of the one-phase stator coil is referred to as the first turn conductor segment 1, and the next conductor segment wound is referred to as the second turn conductor segment.

  In the present embodiment, the first to eighth unit coils are formed by making one round of the stator core 120 by the 24 conductor segments 1 to 24, and the front half of the one-phase stator coil is formed by the eight unit coils. It is formed. Further, the other 24 conductor segments 25 to 48 form the 9th to 16th unit coils in the rear half. Then, the leg portion of the conductor segment 24 constituting the eighth unit coil and the leg portion of the conductor segment 25 constituting the ninth unit coil are connected to form a one-phase stator coil. In this case, the conductor segment 24 of the 24th turn corresponds to the conductor segment at the end of winding in the first half.

  With reference to FIG. 3, the arrangement | positioning relationship and connection relationship of a conductor segment are demonstrated. FIG. 3 is a diagram showing a schematic connection relationship of the stator coil according to the present embodiment. The solid line in FIG. 3 shows the connection relationship between the conductor segments on the non-lead side, and the broken line shows the connection relationship between the conductor segments on the lead side.

  In the first slot group through which one leg of the unit coil penetrates, the strands of two adjacent conductor segments are arranged on the outer diameter side of the stator core 120, and the other leg of the unit coil penetrates through the first slot group. In the two-slot group, the strands of two adjacent conductor segments 180 are arranged on the inner diameter side of the stator core 120. If the number of conductor segments 180 arranged in the slot 160 is N, the number of strands of one unit coil in the slot 160 is [(N / 2) −1], and the strand of the other unit coil The number is [(N / 2) +1]. As an example, when N = 6, the number of strands of one unit coil in the slot 160 is 2, and the number of strands of the other unit coil is 4.

  For example, in the slot S1, the strands of the conductor segments 1, 2, 3, 4 constituting the first unit coil and the strands of the conductor segments 23, 24 constituting the eighth unit coil are arranged. Yes. In the slot S1, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 1, 2, 24, 3, 23, and 4. Thus, in the slot S1, the strands of the two conductor segments 1 and 2 in the first unit coil are arranged adjacent to the outer diameter side, and the number of strands of the first unit coil is four. The number of strands of the 8th unit coil is 2.

  Also, in the slot S7, the strands of the conductor segments 1, 2, 3, 4 constituting the first unit coil and the strands of the conductor segments 5, 6 constituting the second unit coil are arranged. Yes. In the slot S7, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 1, 6, 2, 5, 3, and 4. Thus, in the slot S7, the strands of the two conductor segments 3 and 4 in the first unit coil are arranged adjacent to the inner diameter side, and the number of strands of the first unit coil is four. The number of strands of the second unit coil is two.

  In the slot S13, the strands of the conductor segments 5, 6 constituting the second unit coil and the strands of the conductor segments 7, 8, 9, 10 constituting the third unit coil are arranged. Yes. In the slot S13, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 7, 8, 6, 9, 5, and 10. Thus, in the slot S13, the strands of the two conductor segments 7 and 8 in the third unit coil are arranged adjacent to the outer diameter side, and the number of strands of the second unit coil is 2. The number of strands of the third and third unit coils is four.

  Similarly, in other slots, a conductor wire of a conductor segment constituting a certain unit coil and a conductor wire of a conductor segment constituting another unit coil are arranged. In the above example, the slots S1, S13, S25, S37 belong to the first slot group, the slots S7, S19, S31, S43 belong to the second slot group, the slot belonging to the first slot group, and the second slot group Slots belonging to are alternately arranged. The number of strands of the first, third, fifth and seventh unit coils is four, and the number of strands of the second, fourth, sixth and eighth unit coils is two.

  As shown by a broken line in FIG. 3, the leg portion of the conductor segment 1 arranged in the slot S7 and the leg portion of the conductor segment 2 arranged in the slot S1 are connected with an offset in the radial direction. Further, the leg portion of the conductor segment 2 arranged in the slot S7 and the leg portion of the conductor segment 3 arranged in the slot S1 are connected by being offset in the radial direction. Further, the leg portion of the conductor segment 3 arranged in the slot S7 and the leg portion of the conductor segment 4 arranged in the slot S1 are connected by being offset in the radial direction. In this way, the first unit coil is formed by connecting the conductor segments 1, 2, 3, 4 arranged in the slots S1, S7. Similarly, the second unit coil is formed by connecting the conductor segments 5 and 6 arranged in the slots S7 and S13. Thereafter, the third to eighth unit coils are similarly formed.

  In addition, the leg of the conductor segment 4 arranged in the slot S7 and the leg of the conductor segment 5 arranged in the slot S13 are connected with an offset in the radial direction, whereby the first unit coil and the second unit coil are connected. Are connected to the unit coil. Similarly, the second to eighth unit coils are connected in that order.

  As described above, eight unit coils in the first half are formed by the 24 conductor segments 1 to 24, and eight unit coils in the second half are formed by the other 24 conductor segments 25 to 48. Then, the front half and the rear half are connected to form a one-phase stator coil.

  Also, in order to wind the stator coils of all phases around the stator core 120 while avoiding overlapping with other-phase stator coils, the U-shaped conductor segments are bent in the radial direction on the non-lead side and arranged in the respective slots. doing. Therefore, as shown in FIG. 1, for example, when the conductor segment 1 is arranged on the outermost diameter side over the slots S1 and S7, a part of the conductor segment 1 is located between the slots S1 and S7 on the opposite lead side than the slot. It will be arranged offset to the outer diameter side. Further, when the conductor segment 4 is arranged on the innermost diameter side over the slots S1 and S7, a part of the conductor segment 4 is arranged offset to the inner diameter side from the slot between the slots S1 and S7 on the opposite lead side. It will be. In this way, on the opposite lead side, a part of the conductor segment is arranged offset from the slot to the outer diameter side or the inner diameter side.

  According to the stator 100 described above, the wire of the first turn of the conductor segment 1 that is the start of winding and the wire of the 24th turn of the conductor segment 24 that is the end of winding are arranged in the slot S1 without being adjacent to each other. The strands of the conductor segment 2 of the second turn and the strands of the conductor segment 24 are arranged adjacent to each other. Thereby, the potential difference between the conductor segments 2 and 24 becomes the maximum value of the potential difference generated between the conductor segments.

  When an input voltage is applied from one end of the stator coil, the shared voltage applied to the stator coil increases at a portion where the line distance from the input point is relatively close, and decreases as the neutral point is closer to the output side. Therefore, the conductor segment 2 when the strands of the conductor segments 2 and 24 are arranged adjacent to each other is larger than the potential difference between the conductor segments 1 and 24 when the strands of the conductor segments 1 and 24 are arranged adjacent to each other. , 24 has a lower potential difference. According to this embodiment, since the strands of the conductor segments 2 and 24 are arranged adjacent to each other, the maximum generated between the conductor segments as compared to the case where the strands of the conductor segments 1 and 24 are arranged adjacent to each other. The potential difference can be reduced by one turn. As a result, the insulation performance of the rotating electrical machine can be improved.

(Modification)
Next, a stator coil according to a modification will be described. In the above-described embodiment, the case where six conductor segments 180 are arranged in each slot 160 has been described, but a number of conductor segments 180 other than six may be arranged in each slot 160. As an example, a case where eight conductor segments 180 are arranged in each slot 160 will be described with reference to FIG. FIG. 4 is a diagram illustrating a schematic connection relationship of the stator coils according to the modification. Since N = 8 in the modified example, the number of strands of one unit coil in the slot 160 is 3, and the number of strands of the other unit coil is 5.

  For example, in the slot S1, the strands of the conductor segments 1, 2, 3, 4, and 5 that constitute the first unit coil and the conductor segments 30, 31, and 32 that constitute the eighth unit coil are arranged. ing. In the slot S1, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 1, 2, 32, 3, 31, 4, 30, 5. Thus, in the slot S1, the strands of the two conductor segments 1 and 2 in the first unit coil are arranged adjacent to the outer diameter side, and the number of strands of the first unit coil is 5 The number of strands of the 8th unit coil is 3.

  Further, in the slot S7, the strands of the conductor segments 1, 2, 3, 4, 5 constituting the first unit coil, and the strands of the conductor segments 6, 7, 8 constituting the second unit coil are provided. Is arranged. In the slot S7, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 1, 8, 2, 7, 3, 6, 4, and 5. Thus, in the slot S7, the strands of the two conductor segments 4 and 5 in the first unit coil are arranged adjacent to the inner diameter side, and the number of strands of the first unit coil is 5 The number of strands of the second and second unit coils is three.

  In the slot S13, the strands of the conductor segments 6, 7, 8 constituting the second unit coil and the strands of the conductor segments 9, 10, 11, 12, 13 constituting the third unit coil are provided. Is arranged. In the slot S13, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 9, 10, 8, 11, 7, 12, 6, and 13. Thus, in the slot S13, the strands of the two conductor segments 9, 10 in the third unit coil are arranged adjacent to the outer diameter side, and the number of strands of the second unit coil is 3 The number of strands of the third and third unit coils is five.

  And as shown with the broken line of FIG. 4, the 1st unit coil is formed by connecting the conductor segments 1, 2, 3, 4, and 5 arrange | positioned at slot S1, S7. Similarly, the second unit coil is formed by connecting the conductor segments 6, 7, and 8 disposed in the slots S7 and S13. Thereafter, the third to eighth unit coils are similarly formed. Further, the leg of the conductor segment 5 arranged in the slot S7 and the leg of the conductor segment 6 arranged in the slot S13 are connected with an offset in the radial direction, whereby the first unit coil and the second unit coil are connected. Are connected to the unit coil. Similarly, the second to eighth unit coils are connected in that order.

  As described above, eight unit coils in the first half are formed by the 32 conductor segments 1 to 32, and eight unit coils in the second half are formed by the other 32 conductor segments 33 to 64. Is done. And the leg part of the conductor segment 32 which comprises the 8th unit coil, and the leg part of the conductor segment 33 which comprises the 9th unit coil are connected, and it becomes a 1-phase stator coil.

  Also in this modified example, in the slot S1, the strand of the first turn of the conductor segment 1 and the strand of the 32nd turn of the conductor segment 32 that is the end of winding are arranged without being adjacent to each other, The strands of the conductor segment 2 of the second turn and the strands of the conductor segment 32 are arranged adjacent to each other. Thereby, the potential difference between the conductor segments 2 and 32 becomes the maximum value of the potential difference generated between the conductor segments. Therefore, the maximum potential difference generated between the conductor segments can be reduced by one turn compared to the case where the strands of the conductor segments 1 and 32 are arranged adjacent to each other.

  Next, the operation and effect of the stator according to this embodiment will be described clearly by comparing the stator according to this embodiment with the stator according to the prior art.

  5 to 7 show a stator according to the prior art. FIG. 5 is a plan view of a part of the stator according to the prior art as seen from one side (the opposite lead side) of the stator core in the axial direction, and FIG. 6 shows a part of the stator in the other side of the stator core in the axial direction ( It is the top view seen from the lead side. FIG. 7 is a diagram showing a schematic connection relationship of the stator coil according to the conventional technique.

  Also in the stator 300 according to the prior art, 48 slots 160 are formed in the stator core 120, and in each slot 160, six conductor segments 180 are arranged in the radial direction. The first unit coil is formed by the conductor segments 1, 2, 3 arranged in the slots S1, S7, and the second unit coil is formed by the conductor segments 4, 5, 6 arranged in the slots S7, S13. Is done. The same applies to the following, and the eighth unit coil is formed by the conductor segments 22, 23, 24 arranged in the slots S43, S1.

  As shown in FIG. 7, in the slot S1, the strands of the conductor segments 1, 2, 3 constituting the first unit coil and the strands of the conductor segments 22, 23, 24 constituting the eighth unit coil are included. And are arranged alternately. In the slot S1, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 1, 24, 2, 23, 3, and 22.

  In the slot S7, the strands of the conductor segments 1, 2, 3 constituting the first unit coil and the strands of the conductor segments 4, 5, 6 constituting the second unit coil are alternately arranged. Has been. In the slot S7, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 6, 1, 5, 2, 4, and 3.

  In the slot S13, the strands of the conductor segments 4, 5, and 6 constituting the second unit coil and the strands of the conductor segments 7, 8, and 9 constituting the third unit coil are alternately arranged. Has been. In the slot S13, the strands of the conductor segments are arranged from the outer diameter side to the inner diameter side in the order of the conductor segments 7, 6, 8, 5, 9, and 4.

  Similarly, in other slots, the strands of conductor segments constituting a certain unit coil and the strands of conductor segments constituting another unit coil are alternately arranged. And as shown with the broken line of FIG. 7, the 1st unit coil is formed by connecting the conductor segments 1, 2, and 3 arrange | positioned at slot S1, S7. Similarly, the second to eighth unit coils are formed in the same manner, and are connected in that order to form the first half of the stator coil. Further, eight unit coils in the latter half are formed by the 24 conductor segments 25 to 48, and the front half and the latter half are connected to form a one-phase stator coil.

  In the prior art, as shown in FIG. 6, in order to arrange the six conductor segments in the slot S13, the strands of the conductor segment 4 of the fourth turn are arranged on the innermost diameter side of the slot S13. . The conductor segment 3 is also arranged on the innermost diameter side in the slot S7. In order to connect the legs of the conductor segments 3 and 4 arranged on the innermost diameter side, the legs of the conductor segment 3 are connected on the lead side. The conductor segment 4 is connected to the leg portion of the conductor segment 4 by being bent offset from the slot toward the inner diameter side. Further, in order to connect the leg portions of the conductor segments 6 and 7 arranged on the outermost diameter side, the leg portions of the conductor segment 7 are bent and offset on the outer diameter side of the slot on the lead side. 6 legs are connected. Thus, in the prior art, on the lead side, the leg portions of some conductor segments are bent offset from the slot toward the inner diameter side or outer diameter side and connected to the leg portions of other conductor segments. .

  In the stator 300 according to the prior art, in the slot S1, the element wire of the first turn of the conductor segment 1 and the element wire of the 24th turn of the conductor segment 24 that is the end of winding are arranged adjacent to each other. Thus, the potential difference between the conductor segments 1 and 24 becomes the maximum value of the potential difference generated between the conductor segments.

  When the stator 100 according to the present embodiment is compared with the stator 300 according to the prior art by paying attention to the slot S1, the following differences occur in the arrangement order of the strands of the conductor segments. In the stator 100, the arrangement order of the conductor segments in the slot S1 is “the first turn, the second turn, (the number of slots × the number of turns / the number of phases / the number of windings / 2) the turn,...”. . Therefore, the maximum potential difference between turns is the potential difference between the second turn and the number of turns (number of slots × number of turns / number of phases / number of windings / 2). In the example shown in FIGS. 1 to 3, the number of slots is 48, the number of turns is 6, and the number of phases is 3. In addition, the number of windings is 2 because the conductor segment in the stator core 120 is rotated twice to form a one-phase stator coil. Therefore, in the stator 100, the potential difference between the strand of the conductor segment 2 of the second turn and the strand of the conductor segment 24 of the 24th turn is the maximum value of the potential difference generated between the conductor segments.

  On the other hand, in the stator 300, the arrangement order of the conductor segments in the slot S1 is “the first turn, (the number of slots × the number of turns / the number of phases / the number of windings / 2), the second turn, the second turn,... It becomes. Therefore, the maximum potential difference between turns is the potential difference between the first turn and the number of turns (number of slots × number of turns / number of phases / number of windings / 2). Specifically, the potential difference between the strand of the conductor segment 1 of the first turn and the strand of the conductor segment 24 of the 24th turn is the maximum potential difference generated between the conductor segments.

  As described above, according to the stator 100, the maximum potential difference between turns can be reduced by one turn compared to the stator 300, and as a result, the insulation performance of the rotating electrical machine can be improved.

  In the above-described example, the case where the number of turns is an even number (6 or 8 in the present embodiment) has been described. However, even if the number of turns is an odd number (for example, 5 or 7), By winding the wire of another conductor segment between the wire of the conductor segment at the end of winding and the wire at the end of winding, the maximum potential difference between turns can be reduced by one turn compared to the prior art. When the number of turns is an odd number, in the stator coil according to the present embodiment, a part of the conductor segment is arranged offset on the outer diameter side from the slot on the opposite lead side, and the conductor segment on the lead side. The leg portions of the other conductor segments are bent to be offset toward the inner diameter side of the slot and connected to the leg portions of the other conductor segments. On the other hand, in the stator coil according to the prior art, a part of the conductor segment is arranged offset to the inner diameter side from the slot on the opposite lead side, and the leg portion of the conductor segment is outer diameter than the slot on the lead side. It is bent with offset to the side and connected to the legs of other conductor segments.

  100 stator, 120 stator core, 140 teeth, 160 slots, 180 conductor segments.

Claims (1)

An annular stator core comprising a plurality of teeth extending radially inward and having slots formed between adjacent teeth;
A unit coil interval is defined as a unit coil interval, and unit coils are formed by winding a plurality of strands in a predetermined arrangement order in the radial direction of the stator core at a unit coil interval. One side of the stator core in the axial direction so that a plurality of conductor segments are arranged along the radial direction of two slots arranged at a unit coil interval using a U-shaped conductor segment having a leg portion A plurality of conductor segments are inserted on the other side from the side, and the legs protruding from the end surface on the other side in the axial direction are bent with offset in the radial direction, and the conductor segments in the unit coils adjacent in the radial direction are bent. A stator coil that connects the legs and repeats this sequentially for a plurality of adjacent conductor segments to form a unit coil of a plurality of turns;
Have
A stator of a rotating electrical machine in which a wire of a conductor segment at the start of winding of the stator coil and a wire of a conductor segment at the end of winding are disposed in the same slot
A strand of another conductor segment is disposed between a strand of the conductor segment at the start of winding and a strand of the conductor segment at the end of winding.
A stator for a rotating electrical machine.

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