Stators and rotating electric machines
The stator design with specific wiring patterns for series phase conductors in rotating electric machines addresses the issue of increased copper losses and weight by minimizing the distance between connection points, improving efficiency and performance.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- KK TOSHIBA
- Filing Date
- 2024-11-06
- Publication Date
- 2026-05-19
AI Technical Summary
In rotating electric machines, the connection of parallel circuits in the stator winding results in increased copper losses and weight due to long bus bars, particularly when the lead wire or neutral point is at a distant position.
The stator design incorporates a cylindrical stator core with multiple stator slots and coil segments using rectangular conductors, arranged in series phase conductors with specific wiring patterns to minimize the distance between connection points, reducing copper losses and weight.
This configuration effectively suppresses the increase in losses and weight at the connection points between parallel circuits, enhancing the efficiency and performance of the rotating electric machine.
Smart Images
Figure 2026081846000001_ABST
Abstract
Description
Technical Field
[0001] Embodiments of the present invention relate to a stator and a rotating electric machine.
Background Art
[0002] In motors and generators used in electric vehicles (EVs), plug-in electric vehicles (PEVs), etc., since a large current flows through the stator winding, a flat wire with a large cross-sectional area is used as the conductor of the stator winding.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] When the lead wire side or neutral point side of the parallel circuits in the winding of the rotating electric machine is at a distant position, the bus bar of the connection part connecting the parallel circuits becomes long, resulting in an increase in losses (copper losses) and an increase in weight, which has been a problem.
[0005] The problem to be solved by the present invention is to provide a stator and a rotating electric machine capable of suppressing an increase in losses and an increase in weight at the connection part between parallel circuits in the winding of the rotating electric machine.
Means for Solving the Problems
[0006] To achieve the above objective, the stator according to this embodiment comprises: a cylindrical stator core having a plurality of stator slots extending axially on its inner circumferential surface at circumferential intervals; a plurality of coil segments, each using a rectangular conductor and having a straight section housed in two different stator slots and a bridging section connecting the two straight sections on the outside of the first axial end of the stator core; and a stator winding having first series phase conductors and second series phase conductors arranged in parallel with each other, extending from a lead wire connection section connecting to an external lead wire to a neutral point connection section connecting to a neutral point, wherein the plurality of straight sections form two or more even layers in the radial direction in each of the plurality of stator slots, and the first series phase conductors and the second series phase conductors are connected in series. The conductor has M of the straight sections, and comprises: an inward-direction wiring in which the straight sections are connected and extend from the outermost layer in the radial direction toward the innermost layer without connection between the same layers; an innermost layer circumferential wiring laid in the innermost layer with the straight sections connected in the circumferential direction; an outward-direction wiring in which the straight sections are connected and extend from the innermost layer toward the outermost layer without connection between the same layers toward the outermost layer; and an outermost layer circumferential wiring laid in the outermost layer with the straight sections connected in the circumferential direction, wherein the lead wire connection portion is a first connection portion and the neutral dot line connection portion is a second connection portion, or the neutral dot line connection portion is a first connection portion and the lead wire connection portion is a second connection portion, wherein the first straight section of the straight section of the first series phase conductor connected to the first connection portion and the first straight section of the straight section of the second series phase conductor connected to the first connection portion are located in adjacent stator slots.The first series phase conductor has a second straight section connected to the first straight section by the outermost layer circumferential wiring or the innermost layer circumferential wiring at a distance of (1 pole minus 1 slot) to (1 pole plus 1 slot), and the second straight section connected to the first straight section of the second series phase conductor by the outermost layer circumferential wiring or the innermost layer circumferential wiring at a distance of (1 pole minus 1 slot) to (1 pole plus 1 slot) are located in stator slots that are not adjacent to each other. The Mth straight section of the first series phase conductor connected to the second connection section of the straight section and the Mth straight section of the second series phase conductor connected to the second connection section are located in stator slots adjacent to each other in the layer adjacent to the outermost layer or the layer adjacent to the innermost layer. [Brief explanation of the drawing]
[0007] [Figure 1] This is a longitudinal cross-sectional view showing an example of the configuration of a rotating electric machine according to the first embodiment. [Figure 2] This is a cross-sectional view of the rotor and stator showing an example of the configuration of a rotating electric machine according to the first embodiment. [Figure 3] This is a partial cross-sectional view of the rotor and stator showing the storage state of the stator windings within the stator according to the first embodiment. [Figure 4] This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding of the stator according to the first embodiment. [Figure 5] This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding according to a modified example of the stator according to the first embodiment. [Figure 6] This is a connection diagram showing an example of the connection state between the straight sections of each layer within each stator slot of the stator winding as a comparative example of the first embodiment. [Figure 7] This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding of the stator according to the second embodiment. [Figure 8]This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding according to a modified example of the stator according to the second embodiment. [Figure 9] This is a connection diagram showing an example of the connection state between the straight sections of each layer within each stator slot of the stator winding as a comparative example of the second embodiment. [Figure 10] This is a connection diagram showing the connection status between the straight sections of each layer within each stator slot of the stator winding of the stator according to the third embodiment. [Figure 11] This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding according to a modified example of the stator according to the third embodiment. [Figure 12] This is a connection diagram showing an example of the connection state between the straight sections of each layer within each stator slot of the stator winding as a comparative example of the third embodiment. [Figure 13] This is a connection diagram showing the connection status between the straight sections of each layer within each stator slot of the stator winding of the stator according to the fourth embodiment. [Figure 14] This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding according to a modified example of the stator according to the fourth embodiment. [Figure 15] This is a connection diagram showing an example of the connection state between the straight sections of each layer within each stator slot of the stator winding as a comparative example of the fourth embodiment. [Figure 16] This is a connection diagram showing the connection status between the straight sections of each layer within each stator slot of the stator winding of the stator according to the fifth embodiment. [Figure 17] This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding according to a modified example of the stator according to the fifth embodiment. [Figure 18] This is a connection diagram showing an example of the connection state between the straight sections of each layer within each stator slot of the stator winding, as a comparative example of the fifth embodiment. [Figure 19] This is a connection diagram showing the connection state between the straight sections of each layer within each stator slot of the stator winding of the stator according to the sixth embodiment. [Figure 20]It is a connection diagram showing the connection state between the straight portions of each layer in each stator slot of a stator winding according to a modified example of a stator according to the sixth embodiment. [Figure 21] It is a connection diagram showing an example of the connection state between the straight portions of each layer in each stator slot of a stator winding as a comparison target in the sixth embodiment.
Embodiments for Carrying Out the Invention
[0008] Hereinafter, referring to the drawings, a stator and a rotating electrical machine according to embodiments of the present invention will be described. Here, the same or similar parts are denoted by common reference numerals, and overlapping descriptions are omitted.
[0009] [First Embodiment] FIG. 1 is a cross-sectional view showing a configuration example of a rotating electrical machine 1 having a stator 100 according to an embodiment.
[0010] The rotating electrical machine 1 has a rotor 10, a stator 100, bearings 21, a bearing bracket 22, and a frame 23.
[0011] The rotor 10 has a rotor shaft 11 extending in the direction in which the rotation axis CL, which is the rotation center axis of the rotor 10, extends, a rotor core 12 attached to the outer side in the radial direction of the rotor shaft 11, and permanent magnets 13 arranged in the rotor core 12. In FIG. 1, a synchronous machine having a permanent magnet type rotor 10 is illustrated as an example, but a wound type synchronous machine may also be used, or a squirrel cage type or wound type induction machine may be used.
[0012] Hereinafter, the axial direction refers to the direction parallel to the direction in which the rotation axis CL extends, the radial direction refers to the direction radially away from the rotation axis CL in a cross section perpendicular to the rotation axis CL, and the circumferential direction refers to the direction in which any part of the rotor 10 moves during rotation.
[0013] The stator 100 has a stator core 110 provided on the outer side in the radial direction of the rotor core 12, and a stator winding 120 wound around the stator core 110.
[0014] The stator winding 120 is a winding using flat rectangular conductors insulated with, for example, enamel. The stator winding 120 constitutes a multi-phase circuit, for example, a three-phase circuit. Each phase of the stator winding 120 has a phase conductor 130 that extends from a lead wire connection part 151 (Figure 4) that connects to an external lead wire to a neutral point wire connection part 152 (Figure 4) that connects to the neutral point. Each phase conductor 130 of the stator winding 120 has a plurality of coil segments 140 and segment connection parts 138 that connect the coil segments 140 to each other.
[0015] Each coil segment 140 has two straight sections 141 and a bridging section 142 connecting these two straight sections 141. The straight sections 141 penetrate the interior of the stator slot 111 (Figure 2) formed in the stator core 110. The bridging section 142 of each coil segment 140 is positioned axially outward from the first end 110a of the stator core 110. The ends of these two straight sections 141 that are not connected to the respective bridging section 142 protrude outward from the axial second end 110b of the stator core 110.
[0016] The two straight sections 141 are connected to other coil segments 140 by segment connection sections 138 outside the second end 110b. Here, the segment connection section 138 is, for example, a welded or brazed joint. Note that the straight section 141 outside the second end 110b is not perfectly straight, with a portion of it following a circumferential shape; however, for convenience, in the following explanation, this portion is included and referred to as the straight section 141 without distinction.
[0017] Alternatively, the bridging portion 142 of the coil segment 140 may be located outside the second end portion 110b, and the segment connection portion 138 may be located outside the first end portion 110a.
[0018] Figure 2 is a cross-sectional view of the rotor 10 and stator 100, showing an example of the configuration of the rotating electric machine 1 according to the first embodiment. That is, it shows a cross-section perpendicular to the rotation axis CL. Part A, enclosed by the dashed line, will be explained later with reference to Figure 3.
[0019] Multiple stator slots 111 are formed in the stator core 110 at intervals in the circumferential direction. Stator teeth 112 are formed by adjacent stator slots 111. Each stator slot 111 houses the straight sections 141 of each coil segment 140, stacked radially.
[0020] The rotor 10 shown in Figure 2 has two permanent magnets 13 housed in each magnetic pole within a rotor core 12 mounted radially outside the rotor shaft 11. Note that the rotor 10 shown in Figure 2 is illustrative, and the stator 100 and rotating electric machine 1 according to this embodiment can be applied to other types of rotors as well.
[0021] Figure 3 is a partial cross-sectional view showing the state of the straight section 141 within the stator slot 111 of the stator 100 according to the first embodiment. Figure 3 shows details of section A of the rotating electric machine 1 shown in Figure 2.
[0022] Multiple stator slots 111, which are through grooves extending axially and spaced apart from each other in the circumferential direction, are formed on the radial inner surface of the stator core 110. Furthermore, each of the stator slots 111 is formed adjacent to each other in the circumferential direction, thereby forming a stator tooth 112.
[0023] In each stator slot 111, multiple rectangular conductors, which are the straight sections 141 of the coil segment 140, are stacked radially, electrically insulated from one another. When the coil segment 140 and the segment connection section 138 (Figure 1) constitute the phase conductor 130 (Figure 1) of the stator winding 120, the number of stacked straight sections 141 N in each stator slot 111 is an even number of 2 or more.
[0024] In the example shown in Figure 3, each stator slot 111 has the first layer conductor 141a, the second layer conductor 141b, the third layer conductor 141c, the fourth layer conductor 141d, the fifth layer conductor 141e, and the sixth layer conductor 141f arranged in that order from the radial outside to the inside. In other words, in this case, the number of layers N is 6. The straight section 141 is a general term for these.
[0025] In the following, these rectangular conductors, which are straight sections 141 and are not connected to the stator slots 111, will be referred to as the nth layer conductor (n=1 to N) according to the order of the layers. Alternatively, they may be called the nth layer straight section 141 or the nth layer straight section 141. Figure 3 shows the case where N=6.
[0026] Figure 4 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120 of the stator 100 according to the first embodiment.
[0027] In the connection diagram of Figure 4, the column direction indicates the stator slot numbers 111, i.e., the 1st to 48th slots in arrangement and connection order. Note that some numbers are omitted. Here, the direction to the right in the column direction is the direction in which the stator slot numbers 111 increase. Since the stator slots 111 are arranged in the circumferential direction, when the stator slot number increases, the slot after the 48th slot is the 1st slot. Similarly, when the stator slot number decreases, the slot after the 1st slot is the 48th slot.
[0028] In the connection diagram of Figure 4, the row direction indicates the stacking number from the radially outer side of each stator slot 111, representing layers 1 through 6.
[0029] Figure 4 shows the phase conductor 130 of the U phase. The V phase is shifted by 4 slots from the U phase, and the W phase is shifted by 8 slots from the U phase in the same direction. The phase conductor 130 of the U phase has a first series phase conductor 131 and a second series phase conductor 132 that are in parallel with each other. In this embodiment, the phase conductor 130 of each phase is a collective term for two series-connected first series phase conductors 131 and second series phase conductors 132 that are in parallel with each other.
[0030] The first series phase conductor 131 has coil segments 140 connected in series from the lead wire connection portion 151x to the neutral dot wire connection portion 152x. The straight sections 141x in between are indicated by a consistent numbering from the straight section 1u of the outermost layer (first layer) to the straight section 48u of the second layer.
[0031] The second series phase conductor 132 has coil segments 140 connected in series from the lead wire connection part 151y to the neutral dot wire connection part 152y. The straight section 141y in this section is indicated by a consistent number from the outermost (first layer) straight section 1u' to the outermost (first layer) straight section 48u'.
[0032] The lead wire connection parts 151x and 151y are connected to the same lead wire and are collectively referred to as lead wire connection part 151. The neutral dot wire connection parts 152x and 152y are connected to the same neutral dot wire and are collectively referred to as neutral dot wire connection part 152.
[0033] In Figure 4, the dashed line indicates the bridging portion 142 of the coil segment 140. Alternatively, it may indicate the portion of the coil segment 140 that includes a part of the straight portion 141 and is located outside the first end 110a of the stator 100. The reference numerals in the cells at both ends of the dashed line of the bridging portion 142 indicate the straight portion 141 housed in that layer of the stator slot 111. The solid line indicates the portion of the stator 100 that includes the segment connection portion 138 and is located outside the second end 110b. As shown in Figure 4, the straight portions 141x and 141y are connected alternately by solid and dashed lines.
[0034] Figure 4 shows an example of a 3-phase, 8-pole, 2-slot configuration per pole and phase, for a total of 48 slots. Therefore, in the case of a fully wound cable, the slot spacing for one pole is equivalent to 6 slots. Also, a shift of one pole corresponds to a shift of 6 slots.
[0035] With 48 slots and 6 layers, there are a total of 288 locations, of which one phase occupies one-third, or 96 locations. These 96 locations are filled with parallel first-series phase conductors 131 and second-series phase conductors 132, so each of the first-series phase conductors 131 and second-series phase conductors 132 has 48 linear sections 141. Generally speaking, each of the first-series phase conductors 131 and second-series phase conductors 132 has M linear sections 141, and in this embodiment, the case where M is 48 is shown as an example, and the linear sections 141 are assigned a consistent number from the 1st to the Mth. The number of M is determined by the number of stator slots 111 and the number of layers N.
[0036] The first series of phase conductors 131 has inward-direction wiring 131a, outward-direction wiring 131b, innermost layer circumferential wiring 131f, and outermost layer circumferential wiring 131g. The second series of phase conductors 132 has inward-direction wiring 132a, outward-direction wiring 132b, innermost layer circumferential wiring 132f, and outermost layer circumferential wiring 132g.
[0037] The inward wiring 131a of the first series phase conductor 131 and the inward wiring 132a of the second series phase conductor 132 are laid from the first layer, which is the outermost layer in the radial direction, to the Nth layer, which is the innermost layer, extending radially inward. In other words, they extend from the outermost layer to the innermost layer. In this case, the layer number increases sequentially from the first layer to the Nth layer, and there are no connections between the same layers along the way.
[0038] Next, the arrangement of the first series phase conductor 131 and the second series phase conductor 132 will be described.
[0039] The first straight section 1u of the first series phase conductor 131, which is connected to the lead wire connection section 151x, is in the first layer of the 10th slot. Similarly, the first straight section 1u' of the second series phase conductor 132, which is connected to the lead wire connection section 151x, is in the first layer of the 11th slot. In other words, the first straight sections 1u and 1u' of the first and second series phase conductors, which are connected to the lead wire connection sections, are located in adjacent stator slots in the outermost layer (first layer).
[0040] Next, the arrangement of the first linear section 1u of the first series phase conductor 131 to the 48th linear section 48u connected to the neutral dot line connection will be described.
[0041] First, the first straight section 1u of the first series phase conductor 131 is connected to the second straight section 2u by the outermost circumferential wiring 131g. In this case, the outermost circumferential wiring 131g increases by (1 pole + 1 slot).
[0042] Next, the second straight section 2u to the innermost (6th layer) seventh straight section 7u is connected to the inward wiring 131a. During this process, the slot number alternates between decreasing by (1 pole - 1 slot) and increasing by (1 pole - 1 slot).
[0043] The seventh straight section 7u of the 12th slot on the innermost circumference (6th layer) is connected to the eighth straight section 8u of the 17th slot by the innermost layer circumferential wiring 131f. In this case, the innermost layer circumferential wiring 131f increases by (1 pole - 1 slot).
[0044] Next, the 8th straight section 8u to the outermost (1st layer) 13th straight section 13u is connected to the outward direction wiring 131b. During this process, the slot number is alternately increased by (1 pole - 1 slot) and decreased by (1 pole - 1 slot).
[0045] From the 13th straight section 13u to the 25th straight section 25u, the same arrangement as described above from the 1st straight section 1u to the 13th straight section 13u is repeated. The same applies to the 13th straight section 13u and beyond.
[0046] Next, the arrangement of the second series phase conductor 132 from the first straight section 1u' to the 48th straight section 48u' connected to the neutral dotted line connection will be described.
[0047] First, the first straight section 1u' of the second series phase conductor 132 is connected to the second straight section 2u' by the outermost circumferential wiring 132g. In this case, the outermost circumferential wiring 132g is in the opposite direction to that of the first series phase conductor 131, decreasing by (1 pole + 1 slot).
[0048] Next, the second straight section 2u' to the seventh straight section 7u' on the innermost circumference (6th layer) is connected to the inward wiring 132a. During this process, the slot number alternates between decreasing by (1 pole - 1 slot) and increasing by (1 pole - 1 slot).
[0049] The 7th straight section 7u' in the 47th slot of the innermost layer (6th layer) is connected to the 8th straight section 8u' in the 42nd slot by the innermost layer circumferential wiring 132f. In this case, the innermost layer circumferential wiring 132f decreases in the direction of (1 pole - 1 slot).
[0050] Next, the 8th straight section 8u' to the outermost (1st layer) 13th straight section 13u' is connected to the outward direction wiring 132b. During this process, the slot number is alternately increased by (1 pole - 1 slot) and decreased by (1 pole - 1 slot).
[0051] From the 13th straight section 13u' to the 25th straight section 25u', the same arrangement as the one described above from the 1st straight section 1u' to the 13th straight section 13u' is repeated. The same applies to the 13th straight section 13u' and subsequent sections.
[0052] As a result, the final (48th) straight section 48u is housed in the 10th slot of the second layer, and the final (48th) straight section 48u' is housed in the 11th slot and the adjacent stator slots 111 of the second layer.
[0053] As described above, comparing the first series phase conductor 131 and the second series phase conductor 132, The inner-direction wiring 131a and inner-direction wiring 132a have the same arrangement, and similarly, the outer-direction wiring 132b and outer-direction wiring 132b have the same arrangement. On the other hand, the innermost layer circumferential wiring 131f and innermost layer circumferential wiring 132f are in opposite directions to each other, and similarly, the outermost layer circumferential wiring 131g and outermost layer circumferential wiring 132g are in opposite directions to each other, which is a difference.
[0054] As a result, the first straight section 1u and the first straight section 1u', which are connection points with the lead wire connection section 151 in the outermost layer, and the 48th straight section 48u and the 48th straight section 48u', which are connection points with the neutral dotted line connection section 152 in the layer adjacent to the outermost layer (second layer), are each housed in adjacent stator slots 111.
[0055] The configuration of the stator winding 120 according to this embodiment makes it possible to suppress the increase in losses and weight at the connection points between parallel circuits.
[0056] <Supplement> If we focus solely on the purpose that the first straight section 1u and the first straight section 1u', which are the connection parts with the lead wire connection part 151, are housed in adjacent stator slots 111, and the 48th straight section 48u and the 48th straight section 48u', which are the connection parts with the neutral dot wire connection part 152, are each housed in adjacent stator slots 111, then the following simple case can be considered.
[0057] In other words, this method involves arranging the first series phase conductor 131 and the second series phase conductor 132 so that they are always adjacent to each other, starting from a state where the first straight section 1u and the first straight section 1u', which are connection sections to the lead wire connection section 151, are housed in adjacent stator slots 111.
[0058] In this case, the second series phase conductor 132 is offset by one slot from the first series phase conductor 131 in every slot. In this case, a difference in voltage values occurs between the first series phase conductor 131 and the second series phase conductor 132 due to their phase difference. As a result, a problem arises in which a circulating current is generated in the first series phase conductor 131 and the second series phase conductor 132, which are arranged in parallel with each other between the lead wire connection part 151 and the neutral point wire connection part 152.
[0059] Therefore, a configuration in which the first series phase conductor 131 and the second series phase conductor 132 are always adjacent to each other is not valid.
[0060] <Variation> Figure 5 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120a, relating to a modified example of the stator 100 according to the first embodiment.
[0061] This modified version reverses the order of the first straight section 1u to the 48th straight section 48u and the first straight section 1u' to the 48th straight section 48u' in the first embodiment. That is, the first straight section 1u is replaced with the 48th straight section 48u, the 48th straight section 48u is replaced with the first straight section 1u, the first straight section 1u' is replaced with the 48th straight section 48u', and the 48th straight section 48u' is replaced with the first straight section 1u', and they are arranged in this order.
[0062] As a result, the first straight section 1u and the first straight section 1u', which are connection points with the lead wire connection section 151 in the layer adjacent to the outermost layer (second layer), and the 48th straight section 48u and the 48th straight section 48u', which are connection points with the neutral dot wire connection section 152 in the outermost layer, are each housed in adjacent stator slots 111.
[0063] Therefore, the arrangement between the connection portion with the lead wire connection portion 151 and the connection portion with the neutral dot wire connection portion 152 is substantially the same as in the embodiment.
[0064] As a result, the same effects as in the first embodiment can be obtained.
[0065] In the first embodiment and its modifications, the example illustrates the case where the lead wire connection portion 151 and the neutral dot line connection portion 152 are connected to the straight portion 141 of the outermost layer or a layer adjacent to the outermost layer, but the embodiment is not limited to this. That is, the lead wire connection portion 151 and the neutral dot line connection portion 152 may be connected to the straight portion 141 of the innermost layer or a layer adjacent to the innermost layer. In this case, the configuration is reversed in the radial direction. As a result, the first straight portion 1u and the first straight portion 1u', which are the connection portions with the lead wire connection portion 151 in the layer adjacent to the innermost layer (5th layer) or the innermost layer (6th layer), and the 48th straight portion 48u and the 48th straight portion 48u', which are the connection portions with the neutral dot line connection portion 152 in the innermost layer (6th layer) or a layer adjacent to the innermost layer (5th layer), are each housed in adjacent stator slots 111. The same applies to the following embodiments.
[0066] <Comparative Example> Figure 6 is a connection diagram showing an example of the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120p as a comparison for the first embodiment.
[0067] In this comparative example, the first straight section 1u, which is the connection part to the lead wire connection part 151, i.e., the connection part to the lead wire connection part 151x, is housed in the 10th slot of the first layer, and the first straight section 1u', which is the connection part to the lead wire connection part 151y, is housed in the 11th slot of the first layer. This is the same as in the first embodiment.
[0068] In the first embodiment, the first series phase conductor 131 is connected from the first straight section 1u to the second straight section 2u by the outermost circumferential wiring 131g, and the second series phase conductor 131 is connected from the first straight section 1u' to the second straight section 2u' by the outermost circumferential wiring 132g. Furthermore, the first series phase conductor 131 is connected from the second straight section 2u to the innermost seventh straight section 7u by the inward wiring 131a, and the second series phase conductor 132 is connected from the second straight section 2u' to the innermost seventh straight section 7u' by the inward wiring 132a.
[0069] On the other hand, in the comparative example, there is no initial connection by the outermost circumferential wiring 131g and the outermost circumferential wiring 132g. In the case of the first series phase conductor 131, the connection is made from the first straight section 1u to the innermost sixth straight section 6u by the inward wiring 131a, and in the case of the second series phase conductor 132, the connection is made from the first straight section 1u' to the innermost sixth straight section 6u' by the inward wiring 132a. The subsequent arrangement method is the same as in the first embodiment.
[0070] As a result, the first straight section 1u and the first straight section 1u', which are the connection parts with the lead wire connection part 151, are housed in adjacent stator slots 111, while the 48th straight section 48u and the 48th straight section 48u', which are the connection parts with the neutral dot wire connection part 152, are housed in the first layer of the 17th slot and the first layer of the 4th slot, respectively, in stator slots 111 that are far apart from each other. In other words, the effects of the first embodiment and its modified form cannot be obtained.
[0071] <Effects of Embodiments and Modified Examples> In either the case where the lead wire connection part 151 is the first connection part and the neutral dot wire connection part 152 is the second connection part (first embodiment), or the case where the neutral dot wire connection part 152 is the first connection part and the lead wire connection part 151 is the second connection part (modified example), the configuration is as follows. (The modified example is shown in parentheses.)
[0072] The first series phase conductor 131 and the second series phase conductor 132 have first linear sections connected to the first connection point located in adjacent stator slots in the outermost layer. In each of the first and second series phase conductors, the second linear sections 2u and 2u' (the 47th linear section 47u and 47u') connected to the first linear sections 1u and 1u' (the 48th linear section 48u and 48u') are connected by the outermost layer circumferential wiring 131g. Furthermore, the second linear sections 2u and 2u' (the 47th linear section 47u and 47u') of the first and second series phase conductors 131 and 132 are located in stator slots 111 that are not adjacent to each other.
[0073] Furthermore, the first series phase conductor 131 and the second series phase conductor 132 have 48 straight sections 48u, 48u' (first straight sections 1u, 1u') that are connected to the second connection section located in the stator slots adjacent to each other in the second layer.
[0074] As a result, the configuration of the stator winding 120 according to this embodiment and the modified stator winding 120a makes it possible to suppress the increase in losses and weight at the connection points between parallel circuits.
[0075] [Second Embodiment] Figure 7 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120b of the stator 100 according to the second embodiment.
[0076] This embodiment is a variation of the first embodiment.
[0077] The arrangement of the first series phase conductor 131 and the second series phase conductor 132 will be described below.
[0078] The first straight section 1u of the first series phase conductor 131, which is connected to the lead wire connection section 151x, is in the first layer of the 10th slot. Similarly, the first straight section 1u' of the second series phase conductor 132, which is connected to the lead wire connection section 151x, is in the first layer of the 11th slot. In other words, the first straight sections 1u and 1u' of the first and second series phase conductors, which are connected to the lead wire connection sections, are located in adjacent stator slots in the outermost layer (first layer). This point is the same as in the first embodiment.
[0079] Next, the arrangement of the first linear section 1u of the first series phase conductor 131 to the 48th linear section 48u connected to the neutral dot line connection will be described.
[0080] First, the first straight section 1u of the first series phase conductor 131 is connected to the second straight section 2u by the outermost layer circumferential wiring 131g. In this case, the outermost layer circumferential wiring 131g increases by (1 pole + 1 slot). This point is also the same as in the first embodiment.
[0081] Next, the section from the second straight section 2u to the seventh straight section 7u of the innermost circumference (sixth layer) is connected to the inward wiring 131a. In this process, except for the transition from the second layer to the third phase, the slot number alternates between decreasing by (one pole - one slot) and increasing by (one pole - one slot).
[0082] In contrast to the transition from the second layer to the third phase, the first series phase conductor 131 and the second series phase conductor 132 are displaced from each other. For example, consider the first inward wiring 131a of the first series phase conductor 131. The second layer is the straight section 3u in the 48th slot, and the third phase is the straight section 4u in the 4th slot. That is, it increases by 4 slots (1 pole - 1 slot). Also, in the first inward wiring 132a of the adjacent second series phase conductor 132, the second layer is the straight section 39u' in the 12th slot, and the third phase is the straight section 40u' in the 5th slot. That is, it increases by 6 slots (1 pole + 1 slot). As a result, on the axial outer side of the first end 110a of the stator core 110, the coil segment 130 of the second series phase conductor 131 is positioned along the coil segment 130 of the first series phase conductor 131 and outside the coil segment 130 of the first series phase conductor 131. This is described as the coil segment 130 of the first series phase conductor 131 and the coil segment 130 of the second series phase conductor 132 being displaced from each other in the circumferential direction, or a circumferential displacement occurring. The reverse case is also considered to be displaced.
[0083] The innermost circumferential wiring 131f and 132f are the same as in the first embodiment.
[0084] Next, from the eighth straight section 8u to the outermost (first layer) thirteenth straight section 13u, it is connected to the outer wiring 131b, except for the transition from the third layer to the second layer. During this process, the slot number alternates between increasing by (one pole - one slot) and decreasing by (one pole - one slot). For the transition from the third layer to the second layer, the first series phase conductor 131 and the second series phase conductor 132 are displaced from each other.
[0085] Note that while Figure 7 shows an example where the dislocation is between the second and third layers, the example is not limited to this, and the dislocation may also be located between other adjacent layers. The same applies to other embodiments.
[0086] From the 13th straight section 13u to the 25th straight section 25u, the same arrangement as described above from the 1st straight section 1u to the 13th straight section 13u is repeated. The same applies to the 13th straight section 13u and beyond.
[0087] The second series phase conductor 132 is the same as the first series phase conductor 131.
[0088] With the above configuration, in the stator winding 120b according to this embodiment, the first straight section 1u and the first straight section 1u', which are connection parts with the lead wire connection part 151, and the 48th straight section 48u and the 48th straight section 48u', which are connection parts with the neutral dot wire connection part 152, are each housed in adjacent stator slots 111, and the same effects as in the first embodiment can be obtained.
[0089] <Variation> Figure 8 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120c, according to a modified example of the stator 100 according to the second embodiment.
[0090] This modified version reverses the order of the first straight section 1u to the 48th straight section 48u and the first straight section 1u' to the 48th straight section 48u' in the second embodiment. That is, the first straight section 1u is replaced with the 48th straight section 48u in the first embodiment, the 48th straight section 48u is replaced with the first straight section 1u, the first straight section 1u' is replaced with the 48th straight section 48u', and the 48th straight section 48u' is replaced with the first straight section 1u', and they are arranged in this order.
[0091] Therefore, the arrangement between the connection portion with the lead wire connection portion 151 and the connection portion with the neutral dot wire connection portion 152 is substantially the same as in the embodiment.
[0092] As a result, the same effects as in the first embodiment can be obtained.
[0093] <Comparative Example> Figure 9 is a connection diagram showing an example of the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120q as a comparison for the second embodiment.
[0094] In the comparative example, there is no initial connection by the outermost circumferential wiring 131g and the outermost circumferential wiring 132g. In the case of the first series phase conductor 131, the connection is made from the first straight section 1u to the innermost sixth straight section 6u by the inward wiring 131a, and in the case of the second series phase conductor 132, the connection is made from the first straight section 1u' to the innermost sixth straight section 6u' by the inward wiring 132a. The subsequent arrangement method is the same as in the second embodiment.
[0095] As a result, the first straight section 1u and the first straight section 1u', which are the connection parts with the lead wire connection part 151, are housed in adjacent stator slots 111, while the 48th straight section 48u and the 48th straight section 48u', which are the connection parts with the neutral dot wire connection part 152, are housed in the first layer of the 5th slot and the first layer of the 16th slot, respectively, in stator slots 111 that are far apart from each other. In other words, the effects of the second embodiment and its modified form cannot be obtained.
[0096] [Third Embodiment] Figure 10 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120d of the stator 100 according to the third embodiment. This embodiment is a modification of the first embodiment.
[0097] The arrangement of the first series phase conductor 131 and the second series phase conductor 132 will be described below.
[0098] The first straight section 1u of the first series phase conductor 131, which is connected to the lead wire connection section 151x, is in the first layer of the 10th slot. Similarly, the first straight section 1u' of the second series phase conductor 132, which is connected to the lead wire connection section 151x, is in the first layer of the 11th slot. In other words, the first straight sections 1u and 1u' of the first and second series phase conductors, which are connected to the lead wire connection sections, are located in adjacent stator slots in the outermost layer (first layer). This point is the same as in the first embodiment.
[0099] Next, the arrangement of the first linear section 1u of the first series phase conductor 131 to the 48th linear section 48u connected to the neutral dot line connection will be described.
[0100] First, the first straight section 1u of the first series phase conductor 131 is connected to the second straight section 2u by the outermost circumferential wiring 131g. In this case, the outermost circumferential wiring 131g increases by (1 pole + 1 slot).
[0101] Next, the second straight section 2u to the innermost (6th layer) seventh straight section 7u is connected to the inward direction wiring 131a. During this process, the number of slots decreases by one pole repeatedly.
[0102] The seventh straight section 7u of the 35th slot on the innermost circumference (6th layer) is connected to the eighth straight section 8u of the 40th slot by the innermost layer circumferential wiring 131f. In this case, the innermost layer circumferential wiring 131f increases by (1 pole - 1 slot).
[0103] Next, the 8th straight section 8u to the outermost (first layer) 13th straight section 13u is connected to the outward direction wiring 131b. In this process, the slot number is increased by one pole repeatedly.
[0104] From the 13th straight section 13u to the 25th straight section 25u, the same arrangement as described above from the 1st straight section 1u to the 13th straight section 13u is repeated. The same applies to the 13th straight section 13u and beyond.
[0105] Next, the arrangement of the second series phase conductor 132 from the first straight section 1u' to the 48th straight section 48u' connected to the neutral dotted line connection will be described.
[0106] First, the first straight section 1u' of the second series phase conductor 132 is connected to the second straight section 2u' by the outermost circumferential wiring 132g. In this case, the outermost circumferential wiring 132g is in the opposite direction to that of the first series phase conductor 131, decreasing by (1 pole + 1 slot).
[0107] Next, the second straight section 2u' to the innermost (6th layer) seventh straight section 7u' is connected to the inward direction wiring 132a. During this process, the slot number is repeatedly reduced by one pole.
[0108] The 7th straight section 7u' in the 47th slot of the innermost layer (6th layer) is connected to the 8th straight section 8u' in the 42nd slot by the innermost layer circumferential wiring 132f. In this case, the innermost layer circumferential wiring 132f decreases in the direction of (1 pole - 1 slot).
[0109] Next, the 8th straight section 8u' to the outermost (1st layer) 13th straight section 13u' is connected to the outward direction wiring 132b. In this process, the slot number is increased by one pole repeatedly.
[0110] From the 13th straight section 13u' to the 25th straight section 25u', the same arrangement as the one described above from the 1st straight section 1u' to the 13th straight section 13u' is repeated. The same applies to the 13th straight section 13u' and subsequent sections.
[0111] As a result, the final (48th) straight section 48u is housed in the fourth slot of the second layer, and the final (48th) straight section 48u' is housed in the fifth slot of the second layer and in the adjacent stator slots 111.
[0112] <Variation> Figure 11 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120e, according to a modified example of the stator 100 according to the third embodiment.
[0113] This modified version reverses the order of the first straight section 1u to the 48th straight section 48u and the first straight section 1u' to the 48th straight section 48u' in the third embodiment. That is, the first straight section 1u is replaced with the 48th straight section 48u in the first embodiment, the 48th straight section 48u is replaced with the first straight section 1u, the first straight section 1u' is replaced with the 48th straight section 48u', and the 48th straight section 48u' is replaced with the first straight section 1u', and they are arranged in this order.
[0114] Therefore, the arrangement between the connection portion with the lead wire connection portion 151 and the connection portion with the neutral dot wire connection portion 152 is substantially the same as in the embodiment.
[0115] As a result, the same effects as in the first embodiment can be obtained.
[0116] <Comparative Example> Figure 12 is a connection diagram showing an example of the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120r as a comparison for the third embodiment.
[0117] In this comparative example, the first straight section 1u, which is the connection part to the lead wire connection part 151, i.e., the connection part to the lead wire connection part 151x, is housed in the 10th slot of the first layer, and the first straight section 1u', which is the connection part to the lead wire connection part 151y, is housed in the 11th slot of the first layer. This is the same as in the third embodiment.
[0118] In the comparative example, there is no initial connection by the outermost circumferential wiring 131g and the outermost circumferential wiring 132g. In the case of the first series phase conductor 131, the connection is made from the first straight section 1u to the innermost sixth straight section 6u by the inward wiring 131a, and in the case of the second series phase conductor 132, the connection is made from the first straight section 1u' to the innermost sixth straight section 6u' by the inward wiring 132a. The subsequent arrangement method is the same as in the third embodiment.
[0119] As a result, the first straight section 1u and the first straight section 1u', which are the connection parts with the lead wire connection part 151, are housed in adjacent stator slots 111, while the 48th straight section 48u and the 48th straight section 48u', which are the connection parts with the neutral dot wire connection part 152, are housed in the first layer of the 17th slot and the first layer of the 4th slot, respectively, in stator slots 111 that are far apart from each other. In other words, the effects of the third embodiment and its modifications cannot be obtained.
[0120] [Fourth Embodiment] Figure 13 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120f of the stator 100 according to the fourth embodiment. This embodiment is a modification of the third embodiment.
[0121] The difference from the third embodiment is that, between the second and third layers, the coil segments 130 of the first series phase conductor 131 and the coil segments 130 of the second series phase conductor 132 are displaced relative to each other in the circumferential direction. In other respects, it is the same as the third embodiment.
[0122] <Variation> Figure 14 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120g, according to a modified example of the stator 100 according to the fourth embodiment.
[0123] This modified example reverses the order of the first straight section 1u to the 48th straight section 48u and the first straight section 1u' to the 48th straight section 48u' in the fourth embodiment. Substantially, the arrangement between the connection to the lead wire connection section 151 and the connection to the neutral dot wire connection section 152 is the same as in the embodiment.
[0124] <Comparative Example> Figure 15 is a connection diagram showing an example of the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120s as a comparison for the fourth embodiment.
[0125] In the comparative example, there is no initial connection by the outermost circumferential wiring 131g and the outermost circumferential wiring 132g. In the case of the first series phase conductor 131, the connection is made from the first straight section 1u to the innermost sixth straight section 6u by the inward wiring 131a, and in the case of the second series phase conductor 132, the connection is made from the first straight section 1u' to the innermost sixth straight section 6u' by the inward wiring 132a. The subsequent arrangement method is the same as in the fourth embodiment.
[0126] As a result, the first straight section 1u and the first straight section 1u', which are the connection parts with the lead wire connection part 151, are housed in adjacent stator slots 111, while the 48th straight section 48u and the 48th straight section 48u', which are the connection parts with the neutral dot wire connection part 152, are housed in the first layer of the 5th slot and the first layer of the 16th slot, respectively, in stator slots 111 that are far apart from each other.
[0127] <Explanation of effects> In the fourth embodiment and its modified form, the first straight section 1u and the first straight section 1u', which are connection sections to the lead wire connection section 151, are housed in adjacent stator slots 111, and the 48th straight section 48u and the 48th straight section 48u', which are connection sections to the neutral dot wire connection section 152, are housed in adjacent stator slots 111. As a result, the same effects as in the first to third embodiments are obtained.
[0128] [Fifth Embodiment] Figure 16 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120h of the stator 100 according to the fifth embodiment.
[0129] This embodiment is a variation of the third embodiment. In this embodiment, the difference from the third embodiment is the arrangement of the inward-direction wiring 131a and outward-direction wiring 131b of the first series phase conductor 131, and the inward-direction wiring 132a and outward-direction wiring 132b of the second series phase conductor 132.
[0130] In the first inward wiring 131a of the first series phase conductor 131, the slot number alternates between decreasing by one pole and increasing by one pole from the second straight section 2u to the seventh straight section 7u. Similarly, in the first outward wiring 131b of the first series phase conductor 131, the slot number alternates between increasing by one pole and decreasing by one pole from the eighth straight section 8u to the thirteenth straight section 13u. The same applies thereafter.
[0131] In the first inward wiring 132a of the second series phase conductor 132, the slot number alternates between decreasing by one pole and increasing by one pole from the second straight section 2u' to the seventh straight section 7u'. Similarly, in the first outward wiring 132b of the second series phase conductor 132, the slot number alternates between increasing by one pole and decreasing by one pole from the eighth straight section 8u' to the thirteenth straight section 13u'. The same applies thereafter.
[0132] Ultimately, the 48th straight section 48u of the first series phase conductor 131 is housed in the fourth slot of the second layer, and the 48th straight section 48u' of the second series phase conductor 132 is housed in the fifth slot of the second layer, both in adjacent stator slots 111.
[0133] <Variation> Figure 17 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120j, according to a modified example of the stator 100 according to the fifth embodiment.
[0134] This modified example reverses the order of the first straight section 1u to the 48th straight section 48u and the first straight section 1u' to the 48th straight section 48u' in the first embodiment. Substantially, the arrangement between the connection to the lead wire connection section 151 and the connection to the neutral dot wire connection section 152 is the same as in the embodiment.
[0135] <Comparative Example> Figure 18 is a connection diagram showing an example of the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120t as a comparison for the fifth embodiment.
[0136] In the comparative example, there is no initial connection by the outermost circumferential wiring 131g and the outermost circumferential wiring 132g. In the case of the first series phase conductor 131, the connection is made from the first straight section 1u to the innermost sixth straight section 6u by the inward wiring 131a, and in the case of the second series phase conductor 132, the connection is made from the first straight section 1u' to the innermost sixth straight section 6u' by the inward wiring 132a. The subsequent arrangement method is the same as in the fourth embodiment.
[0137] As a result, the first straight section 1u and the first straight section 1u', which are the connection parts with the lead wire connection part 151, are housed in adjacent stator slots 111, while the 48th straight section 48u and the 48th straight section 48u', which are the connection parts with the neutral dot wire connection part 152, are housed in the first layer of the 17th slot and the first layer of the 4th slot, respectively, in stator slots 111 that are far apart from each other.
[0138] <Explanation of effects> In the fifth embodiment and its modified form, the first straight section 1u and the first straight section 1u', which are connection sections to the lead wire connection section 151, are housed in adjacent stator slots 111, and the 48th straight section 48u and the 48th straight section 48u', which are connection sections to the neutral dot wire connection section 152, are housed in adjacent stator slots 111. As a result, the same effects as in the first to fourth embodiments are obtained.
[0139] [Sixth Embodiment] Figure 19 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120k of the stator 100 according to the sixth embodiment.
[0140] This embodiment is a variation of the first embodiment. The difference from the first embodiment is the presence of a dislocation between the second and third layers; otherwise, it is the same as the first embodiment.
[0141] Therefore, it has the same effects as the first embodiment.
[0142] <Variation> Figure 20 is a connection diagram showing the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120m, according to a modified example of the stator 100 according to the sixth embodiment.
[0143] This modified example reverses the order of the first straight section 1u to the 48th straight section 48u and the first straight section 1u' to the 48th straight section 48u' in the sixth embodiment. Substantially, the arrangement between the connection part with the lead wire connection part 151 and the connection part with the neutral dot wire connection part 152 is the same as in the embodiment.
[0144] <Comparative Example> Figure 21 is a connection diagram showing an example of the connection state between the straight sections 141 of each layer within each stator slot 111 of the stator winding 120z as a comparison for the sixth embodiment.
[0145] In the comparative example, there is no initial connection by the outermost circumferential wiring 131g and the outermost circumferential wiring 132g. In the case of the first series phase conductor 131, the connection is made from the first straight section 1u to the innermost sixth straight section 6u by the inward wiring 131a, and in the case of the second series phase conductor 132, the connection is made from the first straight section 1u' to the innermost sixth straight section 6u' by the inward wiring 132a. The subsequent arrangement method is the same as in the fourth embodiment.
[0146] As a result, the first straight section 1u and the first straight section 1u', which are the connection parts with the lead wire connection part 151, are housed in adjacent stator slots 111, while the 48th straight section 48u and the 48th straight section 48u', which are the connection parts with the neutral dot wire connection part 152, are housed in the first layer of the 5th slot and the first layer of the 15th slot, respectively, in stator slots 111 that are far apart from each other.
[0147] <Explanation of effects> In the sixth embodiment and its modified form, the first straight section 1u and the first straight section 1u', which are connection sections to the lead wire connection section 151, are housed in adjacent stator slots 111, and the 48th straight section 48u and the 48th straight section 48u', which are connection sections to the neutral dot wire connection section 152, are housed in adjacent stator slots 111. As a result, the same effects as in the first to fifth embodiments are obtained.
[0148] According to the embodiments described above, it is possible to provide a stator and a rotating electric machine that can suppress the increase in losses and weight at the connection points between parallel circuits in the windings of a rotating electric machine.
[0149] [Other embodiments] Although embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, the features of each embodiment may be combined. Moreover, the embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of symbols]
[0150] 1...Rotating electric machine, 10...Rotor, 11...Rotor shaft, 12...Rotor core, 13...Permanent magnet, 21...Bearing, 22...Bearing bracket, 23...Frame, 100...Stator, 110...Stator core, 110a...First end, 110b...Second end, 111...Stator slot, 112...Stator teeth, 120, 120a, 120b, 120c, 120d, 120e, 120f, 120g, 120h, 120j, 120k, 120m, 120r, 120s, 120t...Stator winding, 120p, 120q, 120r, 120s, 120t, 120z...Fixed Stator winding (comparative example), 130...phase conductor, 131...first series phase conductor, 131a...inner direction wiring, 131b...outer direction wiring, 131f...innermost layer circumferential wiring, 131g...outermost layer circumferential wiring, 132...second series phase conductor, 132a...inner direction wiring, 132b...outer direction wiring, 132f...innermost layer circumferential wiring, 132g...outermost layer circumferential wiring, 138...segment connection, 140...coil segment, 141, 141x, 141y...straight section, 142...bridge section, 151, 151x, 151y...lead wire connection, 152, 152x, 152y...neutral dot wire connection
Claims
1. A cylindrical stator core having multiple stator slots extending axially on its inner surface, spaced apart in the circumferential direction, Each of the following is a stator winding having a first series phase conductor and a second series phase conductor arranged in parallel with each other, extending from a lead wire connection part that connects to an external lead wire to a neutral point wire connection part that connects to a neutral point, and each of the following is a stator winding having a first series phase conductor and a second series phase conductor arranged in parallel with each other, each extending from a lead wire connection part that connects to an external lead wire to a neutral point wire connection part that connects to a neutral point, A stator comprising, The multiple linear sections form two or more even layers in the radial direction within each of the multiple stator slots. Each of the first series phase conductor and the second series phase conductor is, Having M of the aforementioned linear sections connected in series, The linear portion extends from the outermost layer in the radial direction toward the innermost layer in the radial direction without any connection between layers, and the wiring in the radial direction is connected in this way. In the innermost layer, the innermost layer circumferential wiring is laid with the straight sections connected in the circumferential direction, Outward-facing wiring, in which the straight portion extends from the innermost layer outward in the radial direction to the outermost layer without connection between layers, In the outermost layer, the straight sections are connected in the circumferential direction and laid out, It has, In either case, where the lead wire connection portion is designated as the first connection portion and the neutral dot wire connection portion is designated as the second connection portion, or where the neutral dot wire connection portion is designated as the first connection portion and the lead wire connection portion is designated as the second connection portion, The first linear portion of the first series phase conductor connected to the first connection portion of the linear portion and the first linear portion of the second series phase conductor connected to the first connection portion of the linear portion are located in adjacent stator slots, and the second linear portion of the first series phase conductor is connected to the first linear portion by the outermost layer circumferential wiring or the innermost layer circumferential wiring at a distance of (1 pole minus 1 slot) or (1 pole plus 1 slot), and the second linear portion of the second series phase conductor is connected to the first linear portion by the outermost layer circumferential wiring. The second straight section, connected by outer layer circumferential wiring or innermost layer circumferential wiring at a distance of (one pole minus one slot) or (one pole plus one slot), is located in a stator slot that is not adjacent to each other, and the Mth straight section of the first series phase conductor connected to the second connection section of the straight section, and the Mth straight section of the second series phase conductor connected to the second connection section, are located in adjacent stator slots in the layer adjacent to the outermost layer or the layer adjacent to the innermost layer. A stator characterized by the following features.
2. The stator according to claim 1, characterized in that in each of the first series phase conductor and the second series phase conductor, the first straight portion is located in the outermost layer or the innermost layer, or the straight portion M is located in the outermost layer or the innermost layer.
3. The stator according to claim 1, characterized in that the number of stator slots for each pole and each phase is two or more.
4. The inner wiring of the first series of phase conductors and the inner wiring of the second series of phase conductors are displaced in the circumferential direction between two adjacent layers. The outer wiring of the first series of phase conductors and the outer wiring of the second series of phase conductors are displaced in the circumferential direction between the two adjacent layers. In the inner and outer wiring of the first series phase conductor, and in the inner and outer wiring of the second series phase conductor, the circumferential displacement is such that one of the first series phase conductor and the second series phase conductor is shifted in the circumferential direction by (one pole plus one slot), and the other is shifted in the same direction in the circumferential direction by (one pole minus one slot). The stator according to feature 1.
5. The stator according to claim 4, characterized in that the circumferential displacement occurs on the outside of the first end.
6. The stator according to claim 1, characterized in that the average winding pitch of the first series phase conductor and the second series phase conductor are short-winding windings shorter than the pole pitch.
7. A rotor having a rotor shaft extending in the axial direction, a rotor core mounted radially outward of the rotor shaft, and a plurality of permanent magnets housed within the rotor core, A stator according to any one of claims 1 to 6, A rotating electric machine characterized by having the following features.