JP6649804B2 - Winding structure of rotating electric machine stator - Google Patents

Description

  The present invention relates to a winding structure of a rotating electric machine stator capable of suppressing the height of a coil end.

  2. Description of the Related Art In recent years, a wave winding has been adopted as a main square wire winding system in the automobile industry. A wave winding using a square wire is formed by connecting a plurality of pine needle-shaped segment conductors. A wave shape is formed by joining the ends of the segment conductors that are installed adjacent to each other in the circumferential direction on the near side. The wave winding has an advantage that as the number of turns increases, the magnetomotive force can be increased, and the current can be reduced within a voltage saturation range.

  In Patent Document 1, a stator winding is formed by connecting corrugated conductors at crossover portions. Note that the crossover portion is disposed above the crank portion, which is the top of the conductor.

JP 2011-109894 A

  However, the number of connection points (welding points) of a wave winding increases as the number of windings increases, and the number of crossovers increases in proportion to the increase in the number of windings. Originally, the aim is to reduce the height of the coil end by using a square wire, but the increase in the crossover leads to an increase in the height of the coil end. Further, although the power supply point of each phase can be connected from the outer peripheral side of the stator, the neutral point must be extended from the inner peripheral side of the stator to the outer peripheral side and connected, and the coil end becomes high.

  The present invention has been made in view of the above, and an object of the present invention is to provide a winding structure of a rotating electric machine stator that can suppress the height of a coil end.

  In order to solve the above-mentioned problems and achieve the object, a winding structure of a rotating electrical machine stator according to the present invention is configured such that a predetermined slot is formed in a stator core in which a plurality of teeth and a plurality of slots are alternately formed in a circumferential direction in an annular shape. A winding structure of a rotating electric machine stator in which coils are wound at a pitch, an input point and an output point are formed on a lead portion side, and coils for two turns in two rows are circumferentially wound at a predetermined slot pitch. The first two-turn continuous coil and the first two-turn continuous coil have the same structure, and the first two-turn continuous coil is displaced from the first two-turn continuous coil by the predetermined slot pitch in the circumferential direction. A plurality of two-layer wave-wound coils composed of two continuous winding coils are arranged in the radial direction, and the input point and the output point of the first continuous winding coil are arranged in the same radial direction, and , The input point and the output point of the second two-turn continuous coil are arranged in the same radial direction, and the output point of the first two-turn continuous coil on the outer circumferential side and the inner and The input point of the first two-turn continuous coil is sequentially connected, and the output point of the second two-turn continuous coil on the outer peripheral side adjacent to the radial direction and the second two-turn continuous coil on the inner side are connected. The input points are sequentially connected, and the output point of the innermost circumference of the first two-turn continuous coil is connected to the output point of the innermost circumference of the second two-turn continuous coil. The input point of the two-turn continuous coil is the current input point of the one-phase coil, and the input point of the second outermost two-turn continuous coil is the current output point of the one-phase coil. .

  The winding structure of the rotating electrical machine stator according to the present invention, in the above invention, is arranged such that the first two-turn continuous coil and the second two-turn continuous coil are pine needle-shaped segments from the lead portion side to the slot. A conductor is inserted, the end of the segment conductor is welded on the side opposite to the lead, and the output point of the first two-turn continuous coil on the outer circumference side adjacent in the radial direction and the first two-turns on the inner circumference side Connection between the input point of the continuous coil, connection of the output point of the second two-turn continuous coil on the outer peripheral side adjacent to the radial direction with the input point of the second two-turn continuous coil on the inner side, The connection between the output point of the innermost first two-turn continuous coil and the output point of the innermost second two-turn continuous coil is connected by a pine needle-shaped segment conductor having a slot insertion portion. It is characterized by the following.

  Further, in the winding structure of the rotating electric machine stator according to the present invention, in the above invention, m is an integer of 1 or more, and the number of turns N in the radial direction is N = 2m + 2, and the plurality of first two-turn continuous coils are provided. Between them, an output point at the position of the number of turns (N- (2m-1)) and an input point at the position of the number of turns (N-2m) are connected by a pine needle-shaped segment conductor having a slot insertion portion. At the same time, between the plurality of second two-turn continuous coils, a slot insertion portion is provided between the output point at the position of the number of turns (N- (2m-1)) and the input point at the position of the number of turns (N-2m). Are connected by pine needle-shaped segment conductors having

  Further, in the winding structure of the rotating electric machine stator according to the present invention, in the above-mentioned invention, the first two-turn continuous coil and the second two-turn continuous coil each intersect at a predetermined slot pitch in the radial direction. It is characterized by being wound.

  Further, in the winding structure of the rotating electric machine stator according to the present invention, in the above invention, the three one-phase coils are arranged adjacent to each other in a circumferential direction, and the current input point of each one-phase coil is a feeding point of each phase. The current output point of each one-phase coil is a neutral point connection point and is single-star connected.

  Further, in the winding structure of the rotating electric machine stator according to the present invention, in the above invention, the predetermined slot pitch is a value obtained by dividing the number of slots by the number of poles of the rotor.

  Further, the winding structure of the rotating electrical machine stator according to the present invention is characterized in that, in the above invention, the slot has a semi-closed slot shape.

  According to the present invention, the output points of the radially adjacent first two-turn continuous coil and the input points of the inner-side first two-turn continuous coil are sequentially connected, and are radially adjacent to each other. An output point of the outermost second two-turn continuous coil and an input point of the inner-side second two-turn continuous coil are sequentially connected, and the output of the innermost first two-turn continuous coil is connected. A point and an output point of the second innermost continuous coil are connected to each other, and an input point of the first outermost continuous coil is set as a current input point of the one-phase coil. The input point of the second two-turn continuous coil is the current output point of the one-phase coil. As a result, the current input point and the current output point of the one-phase coil are arranged on the outermost peripheral side of the slot, so that the height of the coil end on the lead portion side can be suppressed and the coil circumference is short, The resistance value of the coil can be suppressed.

FIG. 1 is a diagram illustrating a state in which a wave winding is wound around a stator core when a rotating electric machine stator used for a rotating electric machine such as a permanent magnet type rotating electric machine is configured. FIG. 2 is a perspective view showing a wound state of the first two-turn continuous coil. FIG. 3 is a view of the first two-turn continuous coil linearly expanded as viewed from the lead portion side. FIG. 4 is a perspective view showing a wound state when the first two-turn continuous coil is arranged in the outer circumferential direction. FIG. 5 shows a linearly developed two-layer wave wound coil in which a second two-turn continuous coil having the same configuration as the first two-turn continuous coil is shifted in the rotation direction by a pitch of 6 slots. It is the figure seen from the lead part side. FIG. 6 is a perspective view showing a wound state of a two-layer wave wound coil in which a second two-turn continuous coil having the same configuration as the first two-turn continuous coil is shifted on the rotation direction side by a pitch of six slots. It is. FIG. 7 is a cross-sectional view illustrating a wound state of a wave-wound coil for one phase. FIG. 8 is a diagram showing the connection between the first two continuous coils, the second two continuous coils, and the connection between the first two continuous coils and the second two continuous coils. FIG. 9 is a diagram showing a winding state when the connection shown in FIG. 8 is a pine needle-shaped segment conductor. FIG. 10 is a perspective view showing the lead portion side of the rotating electric machine stator in the connected state shown in FIG. 9. FIG. 11 is a perspective view showing the rotating electrical machine stator on the side opposite to the lead portion. FIG. 12 is an explanatory diagram illustrating a connected state in the case of an eight-turn configuration using four two-layer wave-wound coils. FIG. 13 is an explanatory diagram illustrating a connection state in the case of a four-turn configuration using two two-layer wave-wound coils. FIG. 14 is an explanatory diagram illustrating a connected state in the case of a six-turn configuration using three two-layer wave wound coils. FIG. 15 is an explanatory diagram illustrating a connected state in the case of a 10-turn configuration using five two-layer wave-wound coils. FIG. 16 is an explanatory diagram for explaining a connection state in the case of a 12-turn configuration using six two-layer wave-wound coils. FIG. 17 is an explanatory diagram illustrating a connection state in the case of a 14-turn configuration using seven two-layer wave-wound coils. FIG. 18 is a diagram showing the connection relationship between the pine needle-shaped segment conductors for connecting the two continuous winding coils in the first two continuous winding coils and the second two continuous winding coils, and the first two continuous winding coils and the second two continuous winding coils. It is the figure which generalized the connection relation between circumference continuous coils. FIG. 19 is a cross-sectional view of the stator core in a case where the slot has a semi-closed slot shape.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a diagram illustrating a state in which a wave winding is wound around a stator core when a rotating electric machine stator used for a rotating electric machine such as a permanent magnet type rotating electric machine is configured. As shown in FIG. 1, the stator core 1 has a plurality of teeth 2 and a plurality of slots 3 formed in the circumferential direction RT in an annularly regular manner on the inner peripheral side where the rotor is inserted. In FIG. 1, 48 slots 3 are formed. The number of poles of the rotor (not shown) is eight. The rotating electric machine has a function of a motor and / or a generator. In addition, the stator core 1 is configured by stacking a plurality of annular electromagnetic steel sheets.

  In the present embodiment, the winding wound around the stator core 1 is formed in a wave shape using a plurality of segment conductors 10. Both end portions of the pine needle-shaped segment conductor 10 are inserted into the slots 3 at a predetermined slot pitch in the direction of the central axis AX from the lead portion side (power supply portion side) 1a. A portion of the inserted segment conductor 10 protruding from the side opposite to the lead portion 1b, that is, a portion protruding from the slot insertion portion, is bent so as to expand in the circumferential direction, and the tip 10a of the segment conductor 10 is connected to another adjacent segment conductor 10 Is welded to the tip 10a. By this welding, a first two-turn continuous coil CA1 which is a wave winding composed of the plurality of segment conductors 10 is formed. The winding is preferably a square wire, particularly a flat wire, in order to suppress the height of the coil end.

  FIG. 2 is a perspective view showing a wound state of the first two-turn continuous coil. FIG. 3A is a view of the first two-turn continuous coil CA1 linearly expanded as viewed from the lead portion side 1a. In the first two-turn continuous coil CA1, the respective distal ends 10a of the segment conductors 21 to 28 are connected in series by welding on the non-lead portion side 1b. Both ends of each of the segment conductors 22 to 24 and 26 to 28 are inserted into the slot 3 at a pitch of 6 slots. The segment conductors 22, 26, 23, 27, 24, 28 are inserted with a shift of one slot pitch. The segment conductors 22 to 24 are arranged at a pitch of 6 slots from each other. Similarly, the segment conductors 26 to 28 are arranged at a pitch of 6 slots from each other. The segment conductor 21 is arranged in the connection area EA, separates the one inserted into the slot 3 at a pitch of 7 slots on the lead side 1a, and has a segment conductor 21a having an input point a2 which is a separated end, and another segment conductor 21a. And a segment conductor 21b having an output point a1 as an end. The segment conductor 25 in the power supply area EA has a role of connecting the first-turn coil to the second-turn coil, and both ends are inserted into the slots 3 at a pitch of 5 slots. The segment conductors 25 arranged between the segment conductors 24 and 26 are arranged at a pitch of 6 slots from each of the segment conductors 24 and 26.

  The welded portions T21 to T28 connect the tips of the adjacent segment conductors on the semi-lead portion side 1b by welding. The weld T21 connects between the segment conductors 21a and 22. The weld T22 connects between the segment conductors 22 and 23. The welded portion T23 connects between the segment conductors 23 and 24. The welding portion T24 connects between the segment conductors 24 and 25. The welded portion T25 connects between the segment conductors 25 and 26. The welded portion T26 connects between the segment conductors 26 and 27. The welded portion T27 connects between the segment conductors 27 and 28. The weld T28 connects between the segment conductors 28 and 21b.

  The current input from the input point a2 is sequentially in the clockwise direction CW, the segment conductor 21a, the welding portion T21, the segment conductor 22, the welding portion T22, the segment conductor 23, the welding portion T23, the segment conductor 24, the welding portion T24, and the segment. After passing through the conductor 25, the first winding of the wave ends, and further, the segment conductor 25, the welded portion T25, the segmented conductor 26, the welded portion T26, the segmented conductor 27, the welded portion T27, the segmented conductor 28, the welded portion T28, After flowing through the segment conductor 21b, the wave winding in the second round ends, and reaches the output point a1. As shown in FIG. 3A, the conductors arranged in the adjacent slots, for example, the conductors arranged at the slot positions 6 and 7 have the same current direction.

  Here, the first two-turn continuous coil CA1 is wound in a zigzag manner in the slot 3 at every six-slot pitch, and a radially adjacent layer L1 on the inner circumferential side and a layer L2 on the outer circumferential side are connected to each other. It is wound alternately. The layers indicate the winding positions in the slot 3, and are sequentially shown as layers L1, L2,..., L8 from the inner peripheral side to the outer peripheral side. In addition, since the segment conductors are arranged in an arc along the circumferential direction in the stator core 1, the first winding and the second winding intersect at the lead side 1a and the non-lead side 1b. I do.

  For example, the segment conductor 27 protruding from the layer L1 to the lead portion side 1a extends in the circumferential direction, shifts to the position of the layer L2 at the vertex 27t (see FIG. 2) of a pine needle shape, further extends in the circumferential direction, and has a six-slot pitch. Enter the layer L2 of the eye slot. Similarly, the segment conductors 23 which are arranged at a pitch of one slot are shifted from the layer L1 to the lead portion side 1a and extend in the circumferential direction, shifted to the position of the layer L2 at the vertex 23t of the pine needle shape, and further extend in the circumferential direction. , Into the layer L2 of the sixth slot pitch. Here, the segment conductor 23 is arranged below the segment conductor 27 from the layer L1 to the lead portion side 1a to the top 23t, and enters the layer L2 of the sixth slot pitch from the top 23t. Are arranged on the segment conductor 27. The vertices 27t and 23t have an upwardly convex chevron shape, and a shift of one slot pitch occurs according to a shift of one slot pitch of the segment conductors 27 and 23. Apex portions 27t and 23t are shift points at which segment conductors 27 and 23 shift from layer L1 to layer L2, but are shifted by one slot pitch. Therefore, at the positions of the vertexes 27t and 23t, the intersection where the segment conductors 27 and 23 are turned upside down is performed. By performing this intersection, the height at each coil end can be suppressed without twisting the rectangular wire.

  FIG. 4 is a perspective view showing a wound state when the first two-turn continuous coils CA2 to CA4 having the same configuration as the first two-turn continuous coil CA1 are sequentially arranged in the outer peripheral direction. As shown in FIG. 3, the first two-turn continuous coil CA2 is alternately wound between the layers L3 and L4. The first two-turn continuous coil CA3 is alternately wound between the layers L5 and L6. Further, the first two-turn continuous coil CA4 is alternately wound between the layers L7 and L8. In this case, the input points a2, a4, a6, a8 and the output points a1, a3, a5, a7 of the first two-turn continuous coils CA1 to CA4 gather in the connection area EA, and are linearly formed along the radial direction RCA. Placed in

  Here, in FIG. 3 (b), the output point a7 is connected to the input point a6, the output point a5 is connected to the input point a4, and the output point a3 is connected to the input point a2. , One wave wound coil is formed. That is, the first two-turn continuous coils CA1 to CA4 are connected in series by the connection in the connection area EA. Also, by this connection, the conductors arranged in the same slot, for example, the conductors of the layers L1, L3, L5, and L7 at the slot position 7 have the same current direction.

  Further, as shown in FIG. 5A, a second two-turn continuous coil CB1 having the same configuration as the first two-turn continuous coil CA1 is shifted in the clockwise direction CW by a pitch of six slots. With this arrangement, the two-layer continuous winding coil CB1 is wound around the empty layer of each slot where the first two-turn continuous coil CA1 is wound over the two layers L1 and L2. A coil is formed. Here, the conductors arranged in the same slot around which the coil is wound, for example, the conductors of the layer L1 and the layer L2 at the slot position 7 need to have the same current direction. Assuming that the input point a2 of the continuous loop coil CA1 is a current input point, the input point b2 of the second continuous double coil CB1 is a current output point, and the output point b1 is a current input point. Thereby, as shown in FIG. 5A, the current directions of the coils in the same slot become the same. Note that the input point b2 and the output point b1 of the second two-turn continuous coil CB1 are arranged in the connection area EB shifted by six slots from the connection area EA.

  Then, as shown in FIGS. 5B and 6, similarly to the first two-turn continuous coils CA1 to CA4, the second two-turn continuous coils CB2 to CB2 having the same configuration as the second two-turn continuous coils CB1 CB4 is sequentially arranged toward the outer peripheral direction (radial direction RCB). That is, four two-layer wave wound coils are arranged in the outer peripheral direction. As a result, the input points b2, b4, b6, b8 and the output points b1, b3, b5, b7 of the second two-turn continuous coils CB1 to CB4 gather in the connection area EB, and are respectively linear in the radial direction RCB. Placed in

  As shown in FIG. 7, by disposing the first two-turn continuous coils CA1 to CA4 and the second two-turn continuous coils CB1 to CB4 described above, eight layers (L1 to L8) are provided in two adjacent slots. The coils are shifted in the circumferential direction RT by six slot pitches and are densely arranged.

  In the present embodiment, as shown in FIG. 8, in the first two-turn continuous coils CA1 to CA4, the output point a7 and the input point a6, the output point a5 and the input point a4, and the output point a3 and the input point a2 are In the second two-turn continuous coils CB1 to CB4, the output point b7 and the input point b6, the output point b5 and the input point b4, and the output point b3 and the input point b2 are connected, respectively. The output point a1 of the first two-turn continuous coil CA1 is connected to the output point b1 of the innermost second two-turn continuous coil CB1. Thereby, the conductors arranged in the same slot around which the coil is wound, for example, the conductors of the layer L1 and the layer L2 at the slot position 7 have the same current direction. Further, the current input from the input point a8 of the outermost first two-turn continuous coil CA4 reaches the output point a1 of the first two-turn continuous coil CA1, and is connected by the output point a1 and the output b1. It is folded back to the innermost second two-turn continuous coil CB1 and output from the input point b8 of the outermost second two-turn continuous coil CB4. That is, the first two-turn continuous coils CA1 to CA4 (CA) and the second two-turn continuous coils CB1 to CB4 (CB) form one continuous wave-wound coil for one phase. Moreover, in this case, the current input point and the current output point for the one-phase wave-wound coil are arranged on the outermost peripheral side. For example, when the wave coil for one phase is U-phase, the current input point Uin and the current output point UN are arranged at the outermost periphery of each slot 3.

  Then, like the U-phase one-phase wave winding coil shown in FIG. 7, the V-phase one-phase wave winding coil and the W-phase one-phase wave winding coil are circumferentially provided in two slots in the empty slots. By arranging adjacently by shifting the pitch, a three-phase coil having a single star connection can be generated. That is, as shown in FIG. 8B, the wave winding coil 30U for one U-phase, the wave winding coil 30V for one V-phase, and the wave winding coil 30W for one W-phase are at the neutral point N. A single star connected coil can be generated. In FIG. 8B, current input points Uin, Vin, and Win are feeding points of U phase, V phase, and W phase, respectively, and current output points UN, VN, and WN are U phase, V phase, and W phase, respectively. The neutral point of the phase. Since the current input points Uin, Vin, Win and the current output points UN, VN, WN are arranged at the outermost periphery of each slot 3, a three-phase coil is generated only by connecting the current output points UN, VN, WN. be able to.

  In the present embodiment, as shown in FIG. 9, the output point a7 and the input point a6, the output point a5 and the input point a4, the output point a3 and the input point a2, the output point b7 and the input point b6, and the output point b5 and the input point In connection with the point b4, the output point b3 and the input point b2, and the innermost output point a1 and the innermost output point b1, the pine needle-shaped segment conductors 41, 42, 43, 51, 52, 53, 60U Are connected using. Here, the segment conductor 10 shifts by one layer at the vertex to the outer peripheral layer while extending 6 pitches in the clockwise direction CW, whereas the segment conductors 41, 42, 43, 51, 52, and 53 are shifted. Shifts inward by one layer at the apex while extending in the clockwise direction CW for a pitch of 7 slots. Similarly to the segment conductor 10, the segment conductors 41, 42, 43, 51, 52, and 53 are bent so as to spread in the circumferential direction RT, and the tips are welded. Therefore, when connecting the first two-turn continuous coils CA1 to CA4 and connecting the second two-turn continuous coils CB1 to CB4, welding on the lead portion side 1a becomes unnecessary. As a result, the height of the coil end on the lead side 1a can be reduced. The current output points UN, VN, WN forming the neutral point N may be connected by a three-pronged segment conductor.

  FIG. 10 is a perspective view showing the appearance of the rotating electric machine stator. As shown in FIG. 10, in the coil end 5 a on the lead portion side 1 a, the fold of the first two-turn continuous coil CA and the second two-turn continuous coil CB on the innermost circumference in the U-phase is a pine needle-shaped segment. They are connected by a conductor 60U. Similarly, the V-phase and W-phase are connected by pine needle-shaped segment conductors 60V and 60W.

  Here, the segment conductors 60U, 60V, and 60W connect conductors at slot positions separated by a pitch of 6 slots. Since the segment conductors 60U, 60V, and 60W connect the layers L1 to each other, there is no shift in the radial direction, and the conductors on both sides protruding from the layer L1 at the coil end 5a are bent in the clockwise direction CW. Thereby, it does not interfere with the adjacent segment conductor. The conductor protruding in the clockwise direction CW is folded back in the counterclockwise direction when the adjacent segment conductor shifts to the outer peripheral side at the vertex of the pine needle shape.

  In the present embodiment, as shown in FIG. 10, welding is unnecessary at the coil end 5a on the lead portion side 1a, and the current input points Uin, Vin, Win and the current output points UN, VN, WN are provided on the outermost periphery. Since the coil end 5a is arranged, connection wiring of the neutral point N (current output point UN) and wiring to the power supply (current input point Uin) can be performed outside the radial direction of the coil end 5a, and the height of the coil end 5a can be suppressed. Can be.

  Further, the first two-turn continuous coil CA and the second two-turn continuous coil CB are connected by the shortest segment conductor 60U on the inner circumference side, and are connected between the first two-turn continuous coils CA1 to CA4 and the second Since the two-circle continuous coils CB1 to CB4 are also connected by the shortest segment conductors 41 to 43 and 51 to 53, the coil circumference is shortened and the resistance value of the coil can be suppressed.

  Further, as shown in FIG. 11, welding or insulation coating is applied only to the coil end 5b on the side 1b opposite to the lead portion, so that the work process can be simplified and the insulation quality can be improved.

  To summarize the connection of the U-phase one-phase wave wound coil 30U described above, the first two-turn continuous coils CA1 to CA4 and the second two-turn continuous coils CB1 to CB4 are connected as shown in FIG. The same applies to the wave-wound coils 30V and 30W. The U-phase one-phase wave wound coil 30U has a first two-turn continuous coil CA (CA1 to CA4) and a second two-turn continuous coil CB (CB1 to CB4) connected in series. The current input point Uin is connected to the input point a8 of the first two-turn continuous coil CA4 arranged on the layer L8. An output point a7 of the first two-turn continuous coil CA4 disposed on the layer L7 and an input point a6 of the first two-turn continuous coil CA3 disposed on the layer L6 are connected by a pine needle-shaped segment conductor 41. An output point a5 of the first two-turn continuous coil CA3 disposed on the layer L5 and an input point a4 of the first two-turn continuous coil CA2 disposed on the layer L4 are connected by a pine needle-shaped segment conductor 42. An output point a3 of the first two-turn continuous coil CA2 disposed on the layer L3 and an input point a2 of the first two-turn continuous coil CA1 disposed on the layer L2 are connected by a pine needle-shaped segment conductor 43. The output point a1 of the first two-turn continuous coil CA1 disposed on the layer L1 and the output point b1 of the second two-turn continuous coil CB1 disposed on the layer L1 are connected by a pine needle-shaped segment conductor 60U. You.

  An input point b2 of the second two-turn continuous coil CB1 disposed on the layer L2 and an output point b3 of the second two-turn continuous coil CB2 disposed on the layer L3 are connected by a pine needle-shaped segment conductor 53. The input point b4 of the second continuous winding coil CB2 arranged on the layer L5 and the output point b5 of the second continuous winding coil CB3 arranged on the layer L4 are connected by a pine needle-shaped segment conductor 52. The input point b6 of the second continuous coil CB3 arranged on the layer L6 and the output point b7 of the second continuous coil CB4 arranged on the layer L7 are connected by a pine needle-shaped segment conductor 51. The input point b8 of the second two-turn continuous coil CB4 arranged on the layer L8 is connected to the current output point UN.

  The U-phase and one-phase wave wound coil 30U described above uses eight (8-turn) two-turn continuous coils, that is, first two-turn continuous coils CA1 to CA4 and second two-turn continuous coils CB1 to CB4. However, for example, as shown in FIGS. 13 to 17, the same applies to 4, 6, 10, 12, and 14 turns.

  Here, FIG. 18 is a diagram generalizing the connection relationship of the pine needle-shaped segment conductors for connecting each of the two-turn continuous coils in the first two-turn continuous coil CA and the second two-turn continuous coil CB described above. is there. Here, the number of turns N (N also means the number of layers and the number of turns) is N / 2 and the number of turns is two in the radial direction. Is located adjacent to The first two-turn continuous coil CA has N / 2 first two-turn continuous coils CA1 to CA (N / 2) with respect to the number of turns N. Further, the second two-turn continuous coil CB has N / 2 second two-turn continuous coils CB1 to CB (N / 2) with respect to the number of turns N. Further, the first two-turn continuous coil CA and the second two-turn continuous coil CB are arranged with a pitch shift of 6 slots.

  The input points a2, a4,..., A (N-6), a (N-4), a (N-2), and a (N) corresponding to the input points a2 and the like of the first two-turn continuous coil CA are , Layers (N−2m), (N−2 (m−1)),..., (N−6), (N−4), (N−2), (N), and a central axis They are arranged on a straight line extending radially from AX. Output points a1, a3, ..., a (N-7), a (N-5), a (N-3), a (N-1) corresponding to the output points a1 and the like of the first two-turn continuous coil CA and the like. ) Are arranged in layers (N− (2m + 1)), (N− (2m−1)),..., (N−7), (N−5), (N−3), (N−1). And on a straight line radially extending from the central axis AX. Note that m is an integer of 1 or more, and N is N = 2m + 2.

  The first two-turn continuous coil CA is connected between the output point a (N-1) of the layer (N-1) and the input point a (N-2) of the layer (N-2). -3) between the output point a (N-3) and the input point a (N-4) of the layer (N-4), between the output point a (N-5) of the layer (N-5) and the layer ( N-6) between input point a (N-6), ..., output point a (N- (2m-1)) = a3 of layer (N- (2m-1)) and layer (N-2m) ) And the input point a (N−2m) = a2 are connected by pine needle-shaped segment conductors.

  Similarly, input points b2, b4,..., B (N-6), b (N-4), b (N-2), b () corresponding to the input point b2 of the second two-turn continuous coil CB and the like. N) are arranged in layers (N-2m), (N-2 (m-1)), ..., (N-6), (N-4), (N-2), (N), and Are arranged on a straight line extending radially from the central axis AX. Output points b1, b3,..., B (N-7), b (N-5), b (N-3), b (N-1) corresponding to the output points b1 and the like of the second two-turn continuous coil CB. ) Are arranged in layers (N− (2m + 1)), (N− (2m−1)),..., (N−7), (N−5), (N−3), (N−1). And on a straight line radially extending from the central axis AX.

  The second two-turn continuous coil CB is provided between the output point b (N-1) of the layer (N-1) and the input point b (N-2) of the layer (N-2). -3) between the output point b (N-3) and the input point b (N-4) of the layer (N-4), and between the output point b (N-5) of the layer (N-5) and the layer ( N-6) between input point b (N-6),..., Output point b (N- (2m-1)) = b3 of layer (N- (2m-1)) and layer (N-2m) ) And the input point b (N−2m) = b2 are connected by pine needle-shaped segment conductors.

  That is, assuming that m is an integer equal to or greater than 1 and the number of turns N in the radial direction is N = 2m + 2, the first two-turn continuous coil CA has the layer (N−) at the position of the number of turns (N− (2m−1)). Matsuba between the output point a (N- (2m-1)) of (2m-1)) and the input point a (N-2m) of the layer (N-2m) which is the position of the number of turns (N-2m). It is connected by the segment conductor of the shape. The second two-turn continuous coil CB has an output point b (N− (2m−1)) of the layer (N− (2m−1)) which is the position of the number of turns (N− (2m−1)). A pine needle-shaped segment conductor is connected to the input point b (N-2m) of the layer (N-2m) which is the position of the number of turns (N-2m). Then, the output point a (N− (2m + 1)) of the first two-turn continuous coil CA and the second two-turn continuous coil in the layer (N− (2m + 1)) at the position of the number of turns (N− (2m + 1)) The output point b (N− (2m + 1)) of the CB is connected by a pine needle-shaped segment conductor.

  In any case, the output point a1 of the first two-turn continuous coil CA and the output point b1 of the second two-turn continuous coil CB are connected on the innermost circumference, and the current input point Uin and the current are output on the outermost circumference. An output point UN is arranged.

  In the present embodiment, as shown in FIG. 19, the slot 3 has a semi-closed slot shape having a flange extending in the circumferential direction from the tip of the tooth 2. Thereby, the magnetic flux leakage on the inner peripheral surface of the stator can be suppressed. In the case of an open slot shape having no flange portion, a notch for holding a wedge inserted into the innermost peripheral side of the slot 3 needs to be provided at the tip end of the teeth 2. In the case of the semi-closed slot shape, the notch does not need to be provided since the wedge is caught on the flange.

  In the above-described embodiment, 48 annular slots 3 are formed, and the number of poles of the rotor is set to 8, and the first two-turn continuous coil CA and the second two-turn continuous coil CB are provided at a pitch of 6 slots. In general, assuming that the number of slots is Ns and the number of poles of the rotor is Np, the first two-turn continuous coil CA and the second two-turn continuous coil CB are (Ns / Np). What is necessary is just to shift by a slot pitch of minutes.

DESCRIPTION OF SYMBOLS 1 Stator core 2 Teeth 3 Slot 1a Lead side 1b Non-lead side 5a, 5b Coil end 10, 21, 21a, 21b, 22-28, 41-43, 51-53, 60U, 60V, 60W Segment conductor 23t, 27t Vertices a1, a3, a5, a7, a9, a11, a13, b1, b3, b5, b7, b9, b11, b13 Output points a2, a4, a6, a8, a10, a12, a14, b2, b4, b6 , B8, b10, b12, b14 Input points CA, CA1 to CA4 First two-turn continuous coil CB, CB1 to CB4 Second two-turn continuous coil CW Clockwise direction EA, EB Connection area L1 to L14 Layer N Neutral Point RT Circumferential direction RCA, RCB Radial direction T21 to T28 Welding point

Claims (7)

A winding structure of a rotating electric machine stator in which a plurality of teeth and a plurality of slots are alternately annularly formed in a circumferential direction and a coil is wound at a predetermined slot pitch on a stator core,
An input point and an output point are formed on the lead portion side, and two rows of coils are wound in two rows in the circumferential direction at a predetermined slot pitch, and are the same as the first two-turn continuous coil and the first two-turn continuous coil. A plurality of two-layer wave-wound coils each having a structure and a second two-turn continuous coil arranged at a predetermined slot pitch shifted from the first two-turn continuous coil with respect to the circumferential direction; And the input point and the output point of the first two-turn continuous coil are arranged in the same radial direction, and each of the input point and the output point of the second two-turn continuous coil Are arranged in the same radial direction,
The output point of the first two-turn continuous coil on the outer peripheral side adjacent in the radial direction is sequentially connected to the input point of the first two-turn continuous coil on the inner peripheral side, and the output point on the outer peripheral side adjacent in the radial direction is connected. The output point of the second two-turn continuous coil is sequentially connected to the input point of the second two-turn continuous coil on the inner side, and the output point of the innermost first two-turn continuous coil is connected to the innermost point. And the output point of the second two-turn continuous coil is connected to the input point of the outermost first two-turn continuous coil as the current input point of the one-phase coil. A winding structure of a rotating electric machine stator, wherein an input point of a two-turn continuous coil is a current output point of the one-phase coil. The first two-turn continuous coil and the second two-turn continuous coil insert a pine needle-shaped segment conductor into the slot from the lead portion side, and weld an end of the segment conductor on the opposite lead portion side,
A connection between an output point of the first two-turn continuous coil on the outer peripheral side adjacent to the radial direction and an input point of the first two-turn continuous coil on the inner peripheral side; The connection between the output point of the two continuous coils and the input point of the second continuous coil on the inner peripheral side, and the output point of the innermost first continuous coil and the innermost The winding structure of the rotating electric machine stator according to claim 1, wherein the connection with the output point of the second two-turn continuous coil is connected by a pine needle-shaped segment conductor having a slot insertion portion.   m is an integer of 1 or more, the number of turns N in the radial direction is N = 2m + 2, and between the plurality of first two-turn continuous coils, the output point and the number of turns at the position of the number of turns (N− (2m−1)) The input point at the position (N-2m) is connected by a pine needle-shaped segment conductor having a slot insertion portion, and the number of turns (N- ( 2. A pine needle-shaped segment conductor having a slot insertion portion is connected between an output point at 2m-1)) and an input point at the number of turns (N-2m). Or the winding structure of the rotating electric machine stator according to 2.   The first two-turn continuous coil and the second two-turn continuous coil are wound around each other at predetermined slot pitches in the radial direction. The winding structure of the rotating electric machine stator according to any one of the above.   The three one-phase coils are arranged adjacent to each other in the circumferential direction, the current input point of each one-phase coil becomes a feeding point of each phase, and the current output point of each one-phase coil becomes a neutral point connection point. The winding structure of a rotating electrical machine stator according to any one of claims 1 to 4, wherein the winding structure is a single star connection.   The winding structure for a rotating electric machine stator according to any one of claims 1 to 5, wherein the predetermined slot pitch is a value obtained by dividing the number of slots by the number of poles of the rotor.   The winding structure of a rotating electric machine stator according to any one of claims 1 to 5, wherein the slot has a semi-closed slot shape.

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