Stator Assembly

Abstract

To provide a thin stator assy having high insulation reliability.SOLUTION: A coil conductor of each of a U phase, a V phase, and a W phase has a configuration in which a terminal wiring conductor, a first teeth conductor wound about first teeth, a crossover conductor, a second teeth conductor wound about second teeth, and a neutral point connection conductor are connected in this order. The terminal wiring conductor is connected to the first teeth conductor on an upper side of an insulator. The crossover conductor is disposed on an upper side of the insulator disposed in a stator core and along an outer side of teeth of other phase. The neutral point connection conductor is connected to the second teeth conductor on a lower side of the insulator.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a stator assembly for a three-phase brushless motor.

Background Art

[0002] Patent Document 1 describes the structure of a stator for a three-phase motor. The stator described in Patent Document 1 includes 12 teeth arranged at intervals of a predetermined angle (30°). The 12 teeth are used in groups of 4 for the U-phase, V-phase, and W-phase, respectively. And the U1 tooth for the U-phase, the U2 tooth for the U-phase, the V1 tooth for the V-phase, the V2 tooth for the V-phase, the W1 tooth for the W-phase, the W2 tooth for the W-phase, the U3 tooth for the U-phase, the U5 tooth for the U-phase, the V3 tooth for the V-phase, the V4 tooth for the V-phase, the W3 tooth for the W-phase, and the W4 tooth for the W-phase are arranged annularly (for example, counterclockwise).

[0003] Linear conductors for the U-phase are wound around the teeth constituting the U-phase, linear conductors for the V-phase are wound around the teeth constituting the V-phase, and linear conductors for the W-phase are wound around the teeth constituting the W-phase.

[0004] Among the plurality of teeth constituting the U-phase, the linear conductors for the U-phase of non-adjacent teeth are connected by a U-phase cross wire (conductor). Among the teeth constituting the V-phase, the linear conductors for the V-phase of non-adjacent teeth are connected by a V-phase cross wire (conductor). Among the teeth constituting the W-phase, the linear conductors for the W-phase of non-adjacent teeth are connected by a W-phase cross wire (conductor). And the linear conductors for the U-phase, the linear conductors for the V-phase, and the linear conductors for the W-phase are connected to the neutral point at a predetermined position of an annular structure in which a plurality of teeth are arranged.

[0005] Each layer of cross wires is wound around a plurality of pins provided on the structure. The plurality of pins protrude from the upper surface of the structure and are arranged at intervals along the annular shape.

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2012-253978 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, in the configuration shown in Patent Document 1, there are inevitably points where conductors with a potential difference intersect, such as when a jumper wire (conductor) for the W phase and a conductor connecting the linear conductor for the V phase to the neutral point intersect. This reduces the insulation reliability of the stator. In addition, pins are required to wrap the windings, making it difficult to reduce the profile.

[0008] Therefore, the object of the present invention is to provide a stator assembly that is thin and has high insulation reliability. [Means for solving the problem]

[0009] The stator assembly of this invention comprises a stator core having a back yoke arranged in an annular shape and a plurality of teeth extending toward an annular central axis; an insulator made of an insulating material and positioned to sandwich the stator core from above and below; and a coil conductor wound around the portion of the insulator that covers the plurality of teeth.

[0010] Each of the multiple teeth has a first tooth and a second tooth for each of the U, V, and W phases, and the teeth of each phase are arranged in a repeating sequence along a ring.

[0011] The coil conductor has a coil conductor for each of the U, V, and W phases. The coil conductors of each phase are connected in the following order: terminal wiring conductor, first tooth conductor wound around the first tooth, jumper conductor, second tooth conductor wound around the second tooth, and neutral point connection conductor.

[0012] The terminal wiring conductors connect to the first tooth conductors above the insulators. The jumper conductors are positioned above the insulators on the stator core and along the outside of the teeth of the other phases.

[0013] The neutral point conductor connects to the second tooth conductor on the underside of the insulator and to the busbar conductor on the underside of the insulator. The busbar conductor is positioned above the lowest end of the tooth conductor. The insulator has a through hole outside the teeth, connecting the top to the bottom of the insulator. The terminal wiring conductor passes through the through hole.

[0014] In this configuration, the portion of each phase's coil conductor on the control signal application terminal side (opposite the neutral point), the portion connecting the coil conductors wound around multiple teeth, and the portion connecting each phase's coil conductor to the neutral point are separated by the stator core and insulator. This prevents conductors with large potential differences from being in close proximity. [Effects of the Invention]

[0015] This invention makes it possible to realize a stator assembly with high insulation reliability. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is an equivalent circuit diagram of a motor including a stator assembly according to the first embodiment. [Figure 2] Figure 2 is a perspective view of the stator assembly according to the first embodiment. [Figure 3] Figure 3 is a top view of the stator assembly according to the first embodiment. [Figure 4] Figure 4 is a bottom view of the stator assembly according to the first embodiment. [Figure 5] Figure 5 is a side view of the stator assembly according to the first embodiment. [Figure 6]FIG. 6(A), FIG. 6(B), FIG. 6(C), and FIG. 6(D) are top views showing the respective states in the manufacturing process of the stator assembly according to the first embodiment. [Figure 7] FIG. 7 is a perspective view of the stator assembly according to the second embodiment.

Embodiments for Carrying Out the Invention

[0017] [First Embodiment] The stator assembly according to the first embodiment of the present invention will be described with reference to the drawings.

[0018] (Circuit Configuration of Motor Including Stator Assembly) FIG. 1 is an equivalent circuit diagram of a motor including the stator assembly according to the first embodiment.

[0019] As shown in FIG. 1, the motor including the stator assembly 10 according to the first embodiment is a three-phase AC motor (brushless motor) having U-phase, V-phase, and W-phase. This motor includes a U-phase coil 101U, a V-phase coil 101V, and a W-phase coil 101W.

[0020] One end of the U-phase coil 101U is connected to the input terminal 102U of the U-phase alternating current. One end of the V-phase coil 101V is connected to the input terminal 102V of the V-phase alternating current. One end of the W-phase coil 101W is connected to the input terminal 102W of the W-phase alternating current.

[0021] [[ID= thirty-one]]The other end of the U-phase coil 101U, the other end of the V-phase coil 101V, and the other end of the W-phase coil 101W are connected to the neutral point 103.

[0022] With this circuit configuration, the motor realizes a Y connection (star connection).

[0023] (Structure of Stator Assembly) Figure 2 is a perspective view of the stator assembly according to the first embodiment. Figure 3 is a top view of the stator assembly according to the first embodiment. Figure 4 is a bottom view of the stator assembly according to the first embodiment. Figure 5 is an exploded side view of the stator assembly according to the first embodiment.

[0024] As shown in Figures 2, 3, 4, and 5, the stator assembly 10 comprises a stator core 21, an insulator 30, a busbar conductor 70, and a plurality of coil conductors (coil conductor 410, coil conductor 510, and coil conductor 610).

[0025] The stator core 21 comprises a back yoke and a plurality of teeth (teeth 221, teeth 222, teeth 223, teeth 224, teeth 225, and teeth 226).

[0026] The back yoke is made of magnetic material. Specifically, the back yoke is formed by laminating multiple sheets of electromagnetic steel, which is a soft magnetic material. The back yoke is an annular shape with a predetermined width and height.

[0027] Multiple teeth (teeth 221, 222, 223, 224, 225, and 226) are magnetic. The multiple teeth are positioned inside the back yoke, that is, on the side of the annular central axis formed by the back yoke. The multiple teeth are columnar bodies extending from the inner wall surface of the back yoke toward the central axis. The multiple teeth are arranged at predetermined angular intervals. More specifically, as shown in Figures 3 and 4, teeth 221, 222, 223, 224, 225, and 226 are arranged in this order at angular intervals of approximately 60°, counterclockwise in a top view and clockwise in a bottom view. The multiple teeth are formed from, for example, the same material as the back yoke.

[0028] As a result, the stator core 21 is composed of a back yoke and multiple teeth made of the same material.

[0029] The insulator 30 is made of an insulating material. The insulator 30 is positioned to sandwich the stator core 21 from above and below. More specifically, the insulator 30 comprises an upper cover 31 and a lower cover 33. The upper cover 31 covers the stator core 21 from the top surface up to a predetermined height on the side. The lower cover 33 covers the stator core 21 from the bottom surface up to a predetermined height on the side.

[0030] The insulator 30 has multiple flanges. More specifically, the upper cover 31 of the insulator 30 has multiple flanges (flange 311, flange 312, flange 313, flange 314, flange 315, and flange 316). The multiple flanges (flange 311, flange 312, flange 313, flange 314, flange 315, and flange 316) are positioned in the portion of the upper cover 31 that overlaps with the back yoke of the stator core 21.

[0031] Multiple flange portions (flange portions 311, 312, 313, 314, 315, and 316) are shaped to protrude from the upper surface of the upper cover 31 (the surface opposite to the surface that contacts the back yoke of the stator core 21) and are plate-like in shape along the inner circumference of the back yoke of the stator core 21.

[0032] Multiple flanges are positioned at the points where the back yoke and multiple teeth connect in the stator core 21. More specifically, flange 311 is positioned at the point where the back yoke and tooth 221 connect, flange 312 is positioned at the point where the back yoke and tooth 222 connect, flange 313 is positioned at the point where the back yoke and tooth 223 connect, flange 314 is positioned at the point where the back yoke and tooth 224 connect, flange 315 is positioned at the point where the back yoke and tooth 225 connect, and flange 316 is positioned at the point where the back yoke and tooth 226 connect.

[0033] The flange portion 311 has a recess 3110 that divides the flange portion 311 into two parts, the flange portion 312 has a recess 3120 that divides the flange portion 312 into two parts, the flange portion 313 has a recess 3130 that divides the flange portion 313 into two parts, the flange portion 314 has a recess 3140 that divides the flange portion 314 into two parts, the flange portion 315 has a recess 3150 that divides the flange portion 315 into two parts, and the flange portion 316 has a recess 3160 that divides the flange portion 316 into two parts.

[0034] The insulator 30 has a plurality of protrusions. More specifically, the upper cover 31 of the insulator 30 has a plurality of protrusions (protrusions 321, 322, 323, 324, 325, and 326). The plurality of protrusions are shaped to protrude from the upper surface of the upper cover 31 (the surface opposite to the surface that contacts the back yoke of the stator core 21). The plurality of protrusions are positioned outward from the plurality of flanges.

[0035] When the insulator 30 is viewed from the side, the multiple protrusions are arranged so as to overlap with parts of the recesses of the multiple flange portions. More specifically, protrusion 321 overlaps with part of the recess 3110 of the flange portion 311, protrusion 322 overlaps with part of the recess 3120 of the flange portion 312, protrusion 323 overlaps with part of the recess 3130 of the flange portion 313, protrusion 324 overlaps with part of the recess 3140 of the flange portion 314, protrusion 325 overlaps with part of the recess 3150 of the flange portion 315, and protrusion 326 overlaps with part of the recess 3160 of the flange portion 316.

[0036] As shown in Figures 3 and 4, the insulator 30 has through holes 391, 392, and 393. Through holes 391, 392, and 393 penetrate the insulator 30 (upper cover 31 and lower cover 33) from the top surface to the bottom surface.

[0037] A recess 290 is formed on the outer side of the portion of the stator core 21 where the back yoke and multiple teeth are connected, and through holes 391, 392, and 393 are formed in the portion of the insulator 30 located in the recess 290. More specifically, through hole 391 is formed in the insulator 30 of the recess 290 where the back yoke and teeth 221 of the stator core 21 are connected, through hole 392 is formed in the insulator 30 of the recess 290 where the back yoke and teeth 222 of the stator core 21 are connected, and through hole 393 is formed in the insulator 30 of the recess 290 where the back yoke and teeth 223 of the stator core 21 are connected.

[0038] The busbar conductor 70 is an annular flat plate having a predetermined width. The busbar conductor 70 overlaps the back yoke of the stator core 21 in a top view or a bottom view. The busbar conductor 70 is positioned on the surface of the lower cover 33 of the insulator 30, that is, on the side opposite to the side that abuts the back yoke of the stator core 21.

[0039] Each of the multiple coil conductors consists of a single conductor and is composed of terminal wiring conductors, multiple tooth conductors, jumper wire conductors, and neutral point connection conductors.

[0040] More specifically, the coil conductor 410 consists of a single conductor and its functional parts are a terminal wiring conductor 411, a first tooth conductor 41, a jumper wire conductor 412, a second tooth conductor 42, and a neutral point connection conductor 413. The coil conductor 510 consists of a single conductor and its functional parts are a terminal wiring conductor 511, a first tooth conductor 51, a jumper wire conductor 512, a second tooth conductor 52, and a neutral point connection conductor 513. The coil conductor 610 consists of a single conductor and its functional parts are a terminal wiring conductor 611, a first tooth conductor 61, a jumper wire conductor 612, a second tooth conductor 62, and a neutral point connection conductor 613.

[0041] (Specific arrangement (routing) of the coil conductor 410) The coil conductor 410 is arranged more specifically as follows.

[0042] The terminal wiring conductor 411 is inserted through the through hole 391 and routed from the underside to the topside of the back yoke of the stator core 21. Furthermore, the terminal wiring conductor 411 passes over the upper surface of the portion of the insulator 30 that overlaps with the back yoke of the stator core 21, through the recess 3110, and is guided to the tooth 222 side of the tooth 221, connecting to the first tooth conductor 41.

[0043] The first tooth conductor 41 is wound around the tooth 221 with the insulator 30 in between. The end of the first tooth conductor 41 opposite to the side connected to the terminal wiring conductor 411 is routed along the side end of the flange 311 on the tooth 226 side, to the upper side of the portion where the insulator 30 overlaps with the back yoke of the stator core 21. This end is connected to the jumper conductor 412.

[0044] The jumper conductor 412 is routed towards the teeth 222 through the outer surface of the flange 311 and the upper surface of the projection 321. The jumper conductor 412 is routed in a roughly arc shape, similar to the shape of the back yoke of the stator core 21, along the outer surfaces of the flange 312 and flange 313, up to the portion of the flange 314 on the flange 313 side. The jumper conductor 412 is inserted through the recess 3140 from the outer surface of the portion of the flange 314 on the flange 313 side, and is led towards the teeth 225 side of the teeth 224, connecting to the second tooth conductor 42.

[0045] The second tooth conductor 42 is wound around the tooth 224 with the insulator 30 in between. The end of the second tooth conductor 42 opposite to the side connected to the jumper conductor 412 is pulled out below the tooth 224 and connected to the neutral point connection conductor 413.

[0046] The neutral point connecting conductor 413 is routed to a position between teeth 224 and 225 on the busbar conductor 70 and connected to the busbar conductor 70 by a conductive bonding material or the like.

[0047] (Specific arrangement (routing) of the coil conductor 510) The coil conductor 510 is arranged more specifically as follows.

[0048] The terminal wiring conductor 511 is inserted through the through hole 392 and routed from the underside to the topside of the back yoke of the stator core 21. Furthermore, the terminal wiring conductor 511 passes over the upper surface of the portion of the insulator 30 that overlaps with the back yoke of the stator core 21, through the recess 3120, and is guided to the tooth 223 side of the tooth 222, connecting to the first tooth conductor 51.

[0049] The first tooth conductor 51 is wound around the tooth 222 with the insulator 30 in between. The end of the first tooth conductor 51 opposite to the side connected to the terminal wiring conductor 511 is routed along the side end of the flange 312 on the tooth 221 side, to the upper side of the portion where the insulator 30 overlaps with the back yoke of the stator core 21. This end is connected to the jumper conductor 512.

[0050] The jumper conductor 512 is routed towards the teeth 223 side, passing over the outer surface of the flange 312 and the upper surface of the projection 322. The jumper conductor 512 is routed in a roughly arc shape, similar to the shape of the back yoke of the stator core 21, along the outer surfaces of the flange 313 and flange 314, up to the portion of the flange 315 on the flange 314 side. The jumper conductor 512 is then inserted through the recess 3150 from the outer surface of the portion of the flange 315 on the flange 314 side, leading towards the teeth 226 side of the teeth 225, and connecting to the second tooth conductor 52.

[0051] The second tooth conductor 52 is wound around the tooth 225 with the insulator 30 in between. The end of the second tooth conductor 52 opposite to the side connected to the jumper conductor 512 is pulled out below the tooth 225 and connected to the neutral point connection conductor 513.

[0052] The neutral point connecting conductor 513 is routed to a position between teeth 225 and 226 on the busbar conductor 70 and connected to the busbar conductor 70 by a conductive bonding material or the like.

[0053] (Specific arrangement (routing) of the coil conductor 610) The coil conductor 610 is arranged more specifically as follows.

[0054] The terminal wiring conductor 611 is inserted through the through hole 393 and routed from the underside to the topside of the back yoke of the stator core 21. Furthermore, the terminal wiring conductor 611 passes over the upper surface of the portion of the insulator 30 that overlaps with the back yoke of the stator core 21, through the recess 3130, and is guided to the tooth 224 side of the tooth 223, connecting to the first tooth conductor 61.

[0055] The first tooth conductor 61 is wound around the tooth 223 with the insulator 30 in between. The end of the first tooth conductor 61 opposite to the side connected to the terminal wiring conductor 611 is routed along the side end of the flange 313 on the tooth 222 side, to the upper side of the portion where the insulator 30 overlaps with the back yoke of the stator core 21. This end is connected to the jumper conductor 612.

[0056] The jumper conductor 612 is routed towards the teeth 224 side, passing over the outer surface of the flange 313 and the upper surface of the projection 323. The jumper conductor 612 is routed in a roughly arc shape, similar to the shape of the back yoke of the stator core 21, along the outer surfaces of the flange 314 and flange 315, up to the portion of the flange 316 on the flange 315 side. The jumper conductor 612 is then guided from the outer surface of the portion of the flange 316 on the flange 315 side through the recess 3160 to the teeth 221 side of the teeth 226, and connects to the second tooth conductor 62.

[0057] The conductor 62 for the second tooth is wound around the tooth 226 with the insulator 30 in between. The end of the conductor 62 for the second tooth that is opposite to the side connected to the jumper conductor 612 is pulled out below the tooth 226 and connected to the neutral point connecting conductor 613.

[0058] The neutral point connecting conductor 613 is routed to a position between teeth 226 and 221 on the busbar conductor 70 and connected to the busbar conductor 70 by a conductive bonding material or the like.

[0059] In this configuration, for example, teeth 221 and 224 are set as teeth for the U phase, and coil conductor 410 is set as a coil conductor for the U phase. Teeth 222 and 225 are set as teeth for the V phase, and coil conductor 510 is set as a coil conductor for the V phase. Teeth 223 and 226 are set as teeth for the W phase, and coil conductor 610 is set as a coil conductor for the W phase. As a result, the stator assembly 10 can realize the circuit (wiring) shown in Figure 1 above.

[0060] In this configuration, the portions of the coil conductors that span between multiple teeth are routed to the back yoke of the stator core 21 and the upper side of the insulator 30, while the portions connecting from the teeth to the neutral point are routed from the teeth through the inside of the back yoke to the lower side of the back yoke of the stator core 21 and the insulator 30. Furthermore, the portions of the coil conductors from the terminals to the teeth are arranged through the outer and upper surfaces of the insulator 30. This suppresses the proximity of portions with large potential differences among the coil conductors. Therefore, the stator assembly 10 can achieve high insulation reliability.

[0061] Furthermore, in this configuration, the jumper conductor 412 passes over the upper side of the protrusion 321, and the terminal wiring conductor 411 passes over the side of the protrusion 321, thereby separating the jumper conductor 412 and the terminal wiring conductor 411 by a predetermined distance. The jumper conductor 512 passes over the upper side of the protrusion 322, and the terminal wiring conductor 511 passes over the side of the protrusion 322, thereby separating the jumper conductor 512 and the terminal wiring conductor 511 by a predetermined distance. The jumper conductor 612 passes over the upper side of the protrusion 323, and the terminal wiring conductor 611 passes over the side of the protrusion 323, thereby separating the jumper conductor 612 and the terminal wiring conductor 611 by a predetermined distance.

[0062] As a result, the ends of the first tooth conductor 41 do not come into contact when they cross, thus suppressing proximity. Similarly, the ends of the first tooth conductor 51 do not come into contact when they cross, thus suppressing proximity, and the ends of the first tooth conductor 61 do not come into contact when they cross, thus suppressing proximity. Therefore, the stator assembly 10 can achieve even higher insulation reliability.

[0063] Furthermore, in this configuration, the jumper conductor 412 and jumper conductor 512 run parallel to each other in the section from flange portion 312 to the flange portion 312 side end of flange portion 313. In the section from flange portion 313 to the flange portion 313 side of flange portion 314, jumper conductor 412, jumper conductor 512, and jumper conductor 612 run parallel to each other. In the section from the flange portion 315 side of flange portion 314 to the flange portion 314 side of flange portion 315, jumper conductor 512 and jumper conductor 612 run parallel to each other. In this way, multiple coil conductors, each constituting a different phase, are routed in parallel, but all of them are the ends of each tooth conductor. The potential difference between the ends of each tooth conductor is small compared to the potential difference between the start and end of each tooth conductor. Therefore, even if there are places where the conductors for each tooth run parallel to each other, no insulation problems arise. As a result, the stator assembly 10 can achieve even higher insulation reliability.

[0064] Furthermore, in this configuration, terminal wiring conductors 411, 511, and 611 are routed from the upper to the lower side of the stator core 21 and insulator 30 by passing through through holes 391, 392, and 393 of the insulator 30. This allows the drive signal application terminals to be located on the lower side of the stator assembly 10. Therefore, the drive signal application terminals can be positioned spaced apart from the jumper conductors of the multiple coil conductors.

[0065] In this case, by inserting through holes 391, 392, and 393, the stator assembly 10 can suppress short circuits between the terminal wiring conductors 411, 511, and 611 and the stator core 21.

[0066] (How to assemble stator assembly 10) The stator assembly 10 with the above configuration can be assembled, for example, as shown below. Figures 6(A), 6(B), 6(C), and 6(D) are top views showing each state in the manufacturing process of the stator assembly according to the first embodiment. Note that in order to make the figures easier to see, the reference numerals in Figures 6(A), 6(B), 6(C), and 6(D) have been omitted where appropriate, and reference numerals not shown in Figures 6(A), 6(B), 6(C), and 6(D) will be explained with reference to Figure 4.

[0067] (1) Prepare a stator core 21 consisting of a back yoke and multiple teeth, and attach an insulator 30 to the core.

[0068] (2) As shown in Figure 6(A), the coil conductor 610 (terminal wiring conductor 611) is inserted through the through hole 393 and through the recess 3130 to lead to the tooth 223. The coil conductor 610 (first tooth conductor 61) is wound around the tooth 223 with the insulator 30 in between.

[0069] (3) As shown in Figure 6(B), the coil conductor 610 (jumper conductor 612) is wired along the flange portion 313, flange portion 314, flange portion 315, and the flange portion 315 side of flange portion 316, and is inserted through the recess 3160 to lead to the tooth 226. The coil conductor 610 (conductor for the second tooth 62) is wound around the tooth 226 with the insulator 30 in between. The coil conductor 610 (neutral point connection conductor 613) is pulled out to the underside of the tooth 226.

[0070] (4) The coil conductor 510 is wound around the tooth 222 adjacent to the tooth 223 on which the coil conductor 610 is wound, on the side opposite to the side from which the jumper conductor 612 is drawn. Specifically, as shown in Figure 6(C), the coil conductor 510 (terminal wiring conductor 511) is inserted through the through hole 392 and through the recess 3120 to be guided to the tooth 222. The coil conductor 510 (first tooth conductor 51) is wound around the tooth 222 with the insulator 30 in between.

[0071] (5) As shown in Figure 6(C), the coil conductor 510 (jumper conductor 512) is wired along the flange portion 312, flange portion 313, flange portion 314, and the flange portion 314 side of flange portion 315, and is inserted through the recess 3150 to lead to the tooth 225. The coil conductor 510 (conductor for the second tooth 52) is wound around the tooth 225 with the insulator 30 in between. The coil conductor 510 (neutral point connection conductor 513) is pulled out to the underside of the tooth 225.

[0072] (6) The coil conductor 410 is wound around the tooth 221 adjacent to the tooth 222 on the opposite side from which the jumper conductor 512 is drawn out, relative to the tooth 222 around which the coil conductor 510 is wound. Specifically, as shown in Figure 6(D), the coil conductor 410 (terminal wiring conductor 411) is inserted through the through hole 391 and through the recess 3110 to be guided to the tooth 221. The coil conductor 410 (first tooth conductor 41) is wound around the tooth 221 with the insulator 30 in between.

[0073] (7) As shown in Figure 6(D), the coil conductor 410 (jumper conductor 412) is wired along the flange portion 311, flange portion 312, flange portion 313, and the flange portion 313 side of flange portion 314, and is inserted through the recess 3140 to lead to the tooth 224. The coil conductor 410 (conductor for the second tooth 42) is wound around the tooth 224 with the insulator 30 in between. The coil conductor 410 (neutral point connection conductor 413) is pulled out to the underside of the tooth 224.

[0074] (8) The coil conductor 410 (neutral point connecting conductor 413), the coil conductor 510 (neutral point connecting conductor 513), and the coil conductor 610 (neutral point connecting conductor 613) are connected to the busbar conductor 70.

[0075] In other words, the coil conductors 410, 510, and 610 constituting each phase are wound in a ring in sequence. In this case, the teeth around which the first tooth conductor of each phase's coil conductor is wound are the teeth opposite to the teeth around which the first tooth conductor of another phase is wound, and which are the teeth on which the wire conductor is routed from the first tooth conductor of that other phase to the second tooth conductor. This makes it possible to easily and reliably wind the coil conductor of each phase, even in a configuration where the connecting wire conductors of each phase run parallel and the tooth conductors of each phase are arranged in a ring in sequence.

[0076] By using this assembly method, the stator assembly 10 with the above configuration can be easily assembled.

[0077] [Second Embodiment] A stator assembly according to a second embodiment of the present invention will be described with reference to the figures.

[0078] Figure 7 is a perspective view of the stator assembly according to the second embodiment. As shown in Figure 7, the stator assembly 10A according to the second embodiment differs from the stator assembly 10 according to the first embodiment in that several protrusions have been omitted. The other components of the stator assembly 10A are the same as those of the stator assembly 10, and a description of the similar parts will be omitted.

[0079] Even with this configuration, the stator assembly 10A prevents the points with the largest voltage differences among the multiple coil conductors constituting each phase from being in close proximity, thereby achieving high insulation reliability.

[0080] In the above explanation, we described a configuration using 3 phases × 2 teeth and coil conductors. However, the above-described configuration, such as routing the jumper conductors, can also be applied to a configuration using 3 phases × m = N teeth and coil conductors (where m and N are natural numbers). [Explanation of Symbols]

[0081] 10, 10A: Stator Assembly 21: Stator core 30: Insulator 31: Upper cover 33: Lower cover 41: Conductor for the first tooth 42: Conductor for the second tooth 51: Conductor for the first tooth 52: Conductor for the second tooth 61: Conductor for the first tooth 62: Conductor for the second tooth 70: Busbar conductor 101U: U-phase coil 101V: V-phase coil 101W: W-phase coil 102U, 102V, 102W: Input terminals 103: Neutral point 221, 222, 223, 224, 225, 226: Teeth 290: Dent 311, 312, 313, 314, 315, 316: Tsuba (guard) 321, 322, 323, 324, 325, 326: Protrusion 391, 392, 393: Through holes 410, 510, 610: Coil conductors 411, 511, 611: Terminal wiring conductors 412, 512, 612: Line conductors 413, 513, 613: Neutral point connected conductors 3110, 3120, 3130, 3140, 3150, 3160: Recess

Claims

1. A stator core comprising a back yoke arranged in an annular shape, and a plurality of teeth extending from the back yoke toward the central axis of the annular shape, An insulator made of an insulating material, positioned to sandwich the stator core from above and below, An annular busbar conductor is positioned on the lower surface of the insulator, The insulator comprises a coil conductor wound around the portion covering the plurality of teeth, The plurality of teeth have N teeth, numbered from the 1st to the Nth, where N is a natural number, for each of the U, V, and W phases, and the teeth of each phase are arranged in a repeating sequence along the ring. The coil conductor is Each of the U-phase, V-phase, and W-phase has a coil conductor, Each phase coil conductor has a terminal wiring conductor at one end and a neutral point connection conductor at the other end, and is connected to each of the N teeth by a tooth conductor wound around each tooth and a jumper conductor that spans across the tooth conductors. The aforementioned insulator is The tooth has a through hole extending from the upper surface to the lower surface of the insulator, and on the upper side overlapping the stator core, and on the portion of the multiple teeth that protrude, it is provided with multiple flange portions and protrusions that protrude from the upper surface, Each of the aforementioned flange portions has a recess in the center, The aforementioned protrusion has a portion that overlaps with the recess, which is lower than the flange portion. The terminal wiring conductor is connected to the first tooth conductor among the N teeth on the upper side of the insulator. The crossover conductor is positioned above the insulator located on the stator core and outside the teeth of the other phases, along the upper surface of the protrusion. The neutral point connecting conductor is connected to the Nth tooth conductor among the N teeth on the lower side of the insulator, and is connected to the busbar conductor on the lower surface side of the insulator. The busbar conductor is positioned above the lowest end of the tooth conductor. The terminal wiring conductor is formed from one end of the coil conductor, is positioned on the side of the protruding portion, is guided to the teeth side through the recess, and passes through the through hole. Stator assembly.

2. The busbar conductor is positioned to overlap the back yoke in the stator core when viewed from above or below. The neutral point connecting conductor is connected to the busbar conductor by a conductive bonding material. The stator assembly according to claim 1.

3. The aforementioned multiple teeth are Viewed from above, the first U-phase teeth are used as the reference point, and the first U-phase teeth, first V-phase teeth, first W-phase teeth are arranged in a ring shape in that order, up to the Nth U-phase teeth, the Nth V-phase teeth, and the Nth W-phase teeth. The coil conductor is Including U-phase coil conductors, V-phase coil conductors, and W-phase coil conductors, The U-phase coil conductor has a U-phase connecting conductor that connects from the first U-phase tooth conductor wound around the first U-phase tooth to the second NU-phase tooth conductor wound around the N U-phase tooth, The V-phase coil conductor has a V-phase connecting conductor that connects from the first V-phase tooth conductor wound around the first V-phase tooth to the second NV-phase tooth conductor wound around the N V-phase tooth, The W-phase coil conductor has W-phase connecting conductors that connect from the first W-phase tooth conductor wound around the first W-phase tooth to the second NW-phase tooth conductor wound around the N W-phase tooth, The U-phase jumper conductor, the V-phase jumper conductor, and the W-phase jumper conductor are routed along a direction in which the N W-phase teeth and the N V-phase teeth are aligned in that order, with respect to the first U-phase tooth. The stator assembly according to claim 1 or claim 2.

4. The aforementioned connecting wire conductor is arranged along the outer surface of the plurality of flange portions. The stator assembly according to any one of claims 1 to 3.

5. The connecting wires of each of the aforementioned phases run parallel to each other. The stator assembly according to any one of claims 1 to 4.

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