Stator and busbar module

Abstract

This invention provides a stator and a busbar module. The stator includes: a stator core; a stator coil wound around the stator core; and a busbar module electrically connected to the stator coil and fixed to the coil end formed on one end side of the stator core. The busbar module includes: a module body holding conductive components; a hole through which the module body passes; and a bridging portion extending from a portion of the inner circumferential surface of the hole to other portions of the inner circumferential surface in such a way that the interior of the hole is divided into multiple opening regions, and fixed to the coil end via an adhesive that has been introduced into the hole and cured. Thus, the busbar module can be more securely fixed to the coil end formed on one end side of the stator core using an adhesive.

Description

Technical Field

[0001] This disclosure relates to a stator and a bus bar module electrically connected to a stator coil, the stator including a stator core and a stator coil wound on the stator core. Background Technology

[0002] Previously, a stator with multiple conductive wires was known, and included a power distribution component (see, for example, Patent Document 1) electrically connecting multiple coil ends (leads) protruding axially from the stator core to electrodes of a terminal plate. Patent Document 1 describes a power distribution component that holds the multiple conductive wires and includes a fixing portion, such as a flange with bolt through holes, for fixing the power distribution component to other components. This configuration between the power distribution component and other components suppresses vibrations at the power distribution component, the welded portion between the power distribution component and the coil ends, and the connection portion between the power distribution component and the terminal plate.

[0003] Furthermore, a stator is known in the past, which includes a busbar module disposed facing the outer end face of a coil end formed on one end side of the stator core in an axial direction (see, for example, Patent Document 2). This stator busbar module includes: a plurality of conductor plates (busbars) for allowing current to flow to a plurality of stator coils; and a resin module body housing the plurality of conductor plates. Additionally, a plurality of through slots are formed at the radial end (peripheral portion) of the module body, extending through the module body in an axial direction of the stator. The openings of each through slot at the radial end side are closed by a bridge portion integrally formed with the module body. Furthermore, the busbar module and the coil end are fixed together by an adhesive applied in a manner that surrounds the bridge portion and adheres to the coil end.

[0004] Existing technical documents

[0005] Patent Document 1: Japanese Patent No. 6673518

[0006] Patent Document 2: Japanese Patent Application Publication No. 2020-114116 Summary of the Invention

[0007] In cases where the power distribution components are fixed to other components by bolts, as described in Patent Document 1, space is required around the power distribution components for accommodating bolts and fixing parts, potentially leading to a larger stator size. Therefore, it is preferable to use an adhesive to fix the busbar module to the coil end, as described in Patent Document 2. However, in the stator described in Patent Document 2, through slots and bridging portions are formed on the periphery of the module body, making it difficult to apply adhesive in a manner that completely surrounds the bridging portions. Furthermore, due to insufficient contact area between the module body and the adhesive, it may be impossible to adequately ensure the bonding strength between each bridging portion and the coil end. Therefore, it is required to increase the contact area between the module body and the adhesive to improve the bonding strength between each bridging portion and the coil end.

[0008] Therefore, the main objective of this disclosure is to use an adhesive to more securely fix the bus module to the coil end formed on one end side of the stator core.

[0009] The stator disclosed herein comprises: a stator core; a stator coil wound around the stator core; and a busbar module electrically connected to the stator coil and fixed to an end of the coil, the end of which is formed on one end side of the stator core. The busbar module includes a module body, a bore, and a bridging portion. The module body holds conductive components, the bore penetrates the module body, and the bridging portion extends from a portion of the inner circumferential surface of the bore in a manner that divides the interior of the bore into multiple open regions, extending to other portions of the inner circumferential surface, and is fixed to the coil end via an adhesive that has been introduced into the bore and cured.

[0010] The stator disclosed herein includes a busbar module electrically connected to a stator coil and fixed to the coil end, which is formed on one end side of the stator core. Furthermore, a hole and a bridging portion are formed in the module body of the busbar module. The hole penetrates the module body and is into which adhesive is introduced. The bridging portion is fixed to the coil end via the adhesive, which has cured within the hole. The bridging portion extends from a portion of the inner circumferential surface of the hole to other portions of the inner circumferential surface, dividing the interior of the hole into multiple opening regions. Thus, opening regions are formed on both sides of the bridging portion. The adhesive introduced into the hole, upon contact with the bridging portion, reaches the coil end through the opening regions on both sides of the bridging portion. As a result, the adhesive can adhere to the bridging portion in a manner that surrounds it, and the adhesive can adhere to the inner circumferential surface of the hole, ensuring sufficient contact area between the adhesive and the module body. Furthermore, openings are formed on both sides of the bridging portion, allowing the adhesive to adhere and cure on the inner circumferential surfaces of the bridging portion and the opening at a position more fully inward than the periphery of the module body. This increases the fixing strength of the module body relative to the coil end compared to introducing adhesive into the through-groove at the periphery of the module body. Therefore, the stator of this disclosure can use adhesive to more firmly fix the busbar module to the coil end formed on one end of the stator core, effectively maintaining the electrical connection between multiple stator coils and the busbar module. Attached Figure Description

[0011] Figure 1 This is a schematic structural diagram of the stator of this disclosure.

[0012] Figure 2 This is a top view showing the stator of this disclosure.

[0013] Figure 3 This is a schematic diagram illustrating the stator coil of the stator of the present disclosure.

[0014] Figure 4 This is a schematic structural diagram representing the bus module of this disclosure.

[0015] Figure 5 This is an enlarged view showing the main parts of the busbar module of this disclosure.

[0016] Figure 6 It is along Figure 5 A sectional view along line VI-VI.

[0017] Figure 7 This is a schematic diagram illustrating the steps of fixing the busbar module to the end of the coil.

[0018] Figure 8 This is an enlarged view showing the fixing part at the end of the busbar module and the coil.

[0019] Figure 9 This is an enlarged view illustrating other bridging components that can be applied to the busbar module of this disclosure.

[0020] Figure 10 This is an enlarged view illustrating other stators of this disclosure. Detailed Implementation

[0021] Next, specific embodiments of this disclosure will be described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic structural diagram of stator 1 according to the present disclosure. Figure 2 This is a top view showing stator 1. The stator 1 shown in these figures, together with the rotor (not shown), constitutes a three-phase AC motor (rotating motor), which is used, for example, as a driving force for electric vehicles, hybrid vehicles, or as a generator. The stator 1 in this embodiment includes an annular stator core 2, stator coils 3u (U-phase coils), stator coils 3v (V-phase coils), and stator coils 3w (W-phase coils).

[0023] The stator core 2 of stator 1 is formed, for example, by stacking multiple electromagnetic steel plates 2p that are formed into a roughly circular shape by stamping (see reference). Figure 2 The stator core 2 is connected in the stacking direction by riveting. However, the stator core 2 can also be formed into a ring shape, for example, by pressing and sintering a strongly magnetic powder. Furthermore, the stator core 2 includes: a central hole 2o for arranging the rotor; a plurality of teeth (not shown) extending radially from the outer periphery (yoke portion) of the ring towards the axis (center of the stator core 2), and adjacent to each other with a certain interval in the circumferential direction; and a plurality of slits (not shown) formed between the adjacent teeth. The plurality of slits extend radially in the stator core 2 and are arranged circumferentially with a certain interval. Additionally, each slit in the stator core 2 opens into the central hole 2o, and an insulator (insulating paper, not shown) is disposed within each slit.

[0024] The stator coils 3u, 3v, and 3w of stator 1 are formed by electrically connecting multiple segmented coils 4 that are inserted into multiple slits (insulators) in stator core 2. The segmented coils 4 are electrical conductors formed by bending flat wire into a roughly U-shape, with an insulating coating, for example, made of enamel resin, formed on the surface of the flat wire. Furthermore, each segmented coil 4 has two (a pair) legs 40 (see reference). Figure 1 At the front end of each leg 40, the insulating film is removed to expose the conductor.

[0025] Each segmented coil 4 has two legs 40 inserted into different slits in the stator core 2, from one end face of the stator core 2 ( Figure 1The legs 40 of each segmented coil 4 protruding from the upper end face of the stator core 2 are subjected to bending (torsion) processing using a bending processing device (not shown). Then, the front end of each leg 40 is electrically connected to the front end of the corresponding other segmented coil 4 (leg 40) by welding (in this embodiment, for example, TIG welding). Thus, multiple stator coils 3u, 3v, and 3w are wound relative to the stator core 2. Additionally, on one end side of the stator core 2 in the axial direction ( Figure 1 The upper end of the coil is formed with a loop-shaped end 3a, and on the other end side ( Figure 1 The lower end of the stator core 2 has a ring-shaped coil end 3b. The coil ends 3a and 3b are formed by multiple segmented coils 4, namely stator coils 3u, 3v and 3w, respectively, and protrude outward from the corresponding end faces on the axial direction of the stator core 2.

[0026] In this embodiment, such as Figure 3 As shown, stator coils 3u, 3v, and 3w are connected via a double-star connection (2Y connection). Specifically, stator coil 3u includes a first coil U1 and a second coil U2 connected in parallel. The first coil U1 and the second coil U2 each include a lead wire 40u and a neutral wire 40n formed by one leg 40 of a predetermined segmented coil 4. Furthermore, stator coil 3v includes a first coil V1 and a second coil V2 connected in parallel. The first coil V1 and the second coil V2 each include a lead wire 40v and a neutral wire 40n formed by one leg 40 of a predetermined segmented coil 4. Further, stator coil 3w includes a first coil W1 and a second coil W2 connected in parallel, the first coil W1 and the second coil W2 each including a lead wire 40w and a neutral wire 40n formed by one leg 40 of a predetermined segmented coil 4.

[0027] In addition, in this embodiment, the two leads 40u of stator coil 3u (first coil U1 and second coil U2), the two leads 40v of stator coil 3v (first coil V1 and second coil V2), and the two leads 40w of stator coil 3w (first coil W1 and second coil W2) are respectively connected by welding (in this embodiment, for example, TIG welding) to... Figure 4 The corresponding terminals Tu, Tv, and Tw of the bus module BM shown are electrically connected. Furthermore, the two neutral lines 40n of the stator coil 3u (first coil U1 and second coil U2), the two neutral lines 40n of the stator coil 3v (first coil V1 and second coil V2), and the two neutral lines 40n of the stator coil 3w (first coil W1 and second coil W2) are electrically connected to the corresponding terminals Tn of the bus module BM by welding (in this embodiment, for example, TIG welding).

[0028] The busbar module BM forms the neutral point of stator coils 3u, 3v, and 3w, and electrically connects these stator coils 3u, 3v, and 3w to the power lines 50u, 50v, and 50w. For example... Figure 4 As shown, the bus module BM includes a bus Bu corresponding to the stator coil 3u of phase U, a bus Bv corresponding to the stator coil 3v of phase V, a bus Bw corresponding to the stator coil 3w of phase W, a bus Bn forming the neutral point, and a module body BB formed of an insulator such as resin. The module body BB holds (built-in) the bus Bu, Bv, Bw, and Bn, which are conductive components, and prevents them from contacting each other. In this embodiment, the module body BB of the bus module BM is formed to extend in a generally arc shape by means of embedding molding or the like.

[0029] Busbar Bu includes one end (terminal) Tpu and two ends (terminals) Tu that are electrically connected to the leads 40u of the first coil U1 or the second coil U2 of stator coil 3u, respectively. Additionally, busbar Bv includes one end (terminal) Tpv and two ends (terminals) Tv that are electrically connected to the leads 40v of the first coil V1 or the second coil V2 of stator coil 3v, respectively. Further, busbar Bw includes one end (terminal) Tpw and two ends (terminals) Tw that are electrically connected to the leads 40w of the first coil W1 or the second coil W2 of stator coil 3w, respectively. Additionally, busbar Bn includes three ends (terminals) Tn. The ends Tu, Tv, Tw, Tn, Tpu, Tpv, and Tpw of busbars Bu-Bn are exposed externally from the module body BB.

[0030] The end Tpu of busbar Bu is electrically connected to the front end (exposed conductor portion with insulation removed) 51 of power line 50u by welding (e.g., TIG welding in this embodiment). Similarly, the end Tpv of busbar Bv is electrically connected to the front end 51 of power line 50v by welding, and the end Tpw of busbar Bv is electrically connected to the front end 51 of power line 50w by welding. Power lines 50u, 50v, and 50w are formed, for example, of a conductive material with an insulating coating formed on its surface, and are each held by a resin-made retaining member 6.

[0031] The terminals for each power line (50u, 50v, 50w) are 5u, 5v, 5w (refer to...). Figure 2The busbar Bn is fixed to a terminal plate (not shown) and connected to a converter (not shown) via power lines. This terminal plate is installed (fixed) to the housing of a three-phase AC motor (not shown). Furthermore, each end Tn of the busbar Bn is electrically connected (in this embodiment, for example, to TIG welding) to any one of the corresponding neutral lines 40n of the first coil U1 and second coil U2 of stator coil 3u, the first coil V1 and second coil V2 of stator coil 3v, and the first coil W1 and second coil W2 of stator coil 3w. Thus, the busbar Bn forms the neutral point of stator coils 3u, 3v, and 3w.

[0032] Furthermore, on the stator core 2, from the coil end 3a side ( Figure 1 (upper side) towards coil end 3b side ( Figure 1 The lower side of the coil 4 is coated with a resin (thermosetting resin) such as varnish. By curing the resin, each segmented coil 4 and the insulator (not shown) are fixed to the stator core 2. In addition, the exposed portions of the conductors, such as the joints between the front ends of the segmented coils 4, are coated with insulating powder. However, instead of coating the exposed portions of the conductors with insulating powder, an annular resin molding portion covering the coil ends 3a may be formed on the stator 1.

[0033] In the stator 1 configured as described above, multiple stator coils 3u, 3v, and 3w are electrically connected to power lines 50u, 50v, and 50w via a bus module BM. When the bus module BM in the stator 1 is not fixed relative to other components, its movement (vibration) relative to the stator core 2 applies forces to the welded joints (electrical connections) between the stator coils 3u, 3v, and 3w and the bus module BM (terminals Tu, Tv, Tw, Tn), and to multiple welded joints (electrical connections) between the bus module BM (terminals Tpu, Tpv, Tpw) and the power lines 50u, 50v, and 50w. As a result, the durability of these welded joints may be reduced.

[0034] Therefore, in this embodiment, as Figure 2 As shown, in Figure 1 The upper surface (upper surface) of the upper coil end 3a (the plurality of segmented coils 4 forming the coil end 3a) is fixed to the busbar module BM by adhesive. That is, as shown in the figure Figure 4 and Figure 5 As shown, in order to fix the busbar module BM to the outer surface of the coil end 3a using adhesive, multiple (two in this embodiment) holes H are formed in the module body BB of the busbar module BM, through which the module body BB passes. In this embodiment, as... Figure 4As shown, a hole H is formed at each of the two ends along the length of the module body BB. Figure 5 and Figure 6 As shown, each hole H is a tapered hole that tapers towards the coil end 3a, and has a polygonal planar shape. That is, the inner circumferential surface Si of each hole H is formed in a funnel shape (mortar shape), so that as it approaches the coil end 3a side (… Figure 6 It slopes towards the center of the hole H (on the lower side of the hole).

[0035] Furthermore, bridging portions BR are formed inside each hole H of the module body BB. In this embodiment, as... Figure 6 As shown, the bridging portion BR is formed as a round rod with an outer diameter smaller than the thickness of the module body BB, and is positioned close to the surface of the coil end 3a side of the module body BB. Figure 6 The lower surface of the hole is arranged within the hole H. Furthermore, the bridging portion BR extends from a portion of the inner circumferential surface Si of the corresponding hole H to other portions of the inner circumferential surface Si opposite to that portion, dividing the interior of the hole H into multiple opening regions OA. That is, as... Figure 5 As shown, an opening region OA is formed on each side of the bridging portion BR. Furthermore, in this embodiment, the bridging portion BR extends in a direction orthogonal to the central axis of the module body BB, which extends in an arc shape along its length. That is, each bridging portion BR is formed on the module body BB such that it extends radially along the stator core 2 when the busbar module BM is fixed to the coil end 3a.

[0036] When fixing the busbar module BM to the coil end 3a formed on one end side of the stator core 2, after welding the corresponding terminals Tu, Tv, Tw, Tn, Tpu, Tpv or Tpw of the busbar module BM to the front ends 51 of the stator coils 3u, 3v, 3w's lead wires 40u, 40v, 40w, neutral wire 40n and power wires 50u, 50v, 50w, the busbar module BM is positioned on the outer surface of the coil end 3a using a fixture (not shown). Further, for example, current is applied to each stator coil 3u, 3v, 3w from a DC power supply to heat (preheat) the stator coils 3u, 3v, 3w to a predetermined temperature. Then, as... Figure 7 As shown, the nozzle N is moved above the hole H of the module body BB, and adhesive A is dripped from the nozzle N into the hole H. In this embodiment, a high-viscosity varnish with a higher viscosity than the varnish used to fix the segmented coil 4 and the insulator to the stator core 2 is used as adhesive A.

[0037] like Figure 7As shown, the adhesive A, dripped from nozzle N and introduced into orifice H, reaches coil end 3a after encountering bridging portion BR, passing through two opening regions OA formed on both sides of bridging portion BR. Thus, as... Figure 8 As shown, adhesive A can be attached to the bridging portion BR in a manner that surrounds it, and adhesive A can be attached to the inner peripheral surface Si of the hole H, thus ensuring sufficient contact area between adhesive A and the module body BB. Furthermore, since opening areas OA are formed on both sides of the bridging portion BR, adhesive A adheres to the bridging portion BR and the inner peripheral surface Si of the hole H at a position more fully inward than the periphery of the module body BB. After a predetermined amount of adhesive A is applied to each hole H, adhesive A is cured by energizing each stator coil 3u, 3v, 3w or by heating in a furnace. Thus, the adhesive A introduced into each hole H is cured, and through the cured adhesive A, each bridging portion BR and the inner peripheral surface Si, i.e., the module body BB, are fixed to the coil end 3a.

[0038] As described above, based on the busbar module BM, the contact area between the adhesive A and the module body BB can be sufficiently ensured, and the adhesive A can be adhered to a position more fully inward than the periphery of the module body BB. Therefore, compared to introducing adhesive into the through-groove at the periphery of the module body BB, the fixing strength of the module body BB relative to the coil end 3a can be improved. Thus, in the stator 1, the busbar module BM can be more firmly fixed to the coil end 3a formed on one end side of the stator core 2 using adhesive A, reducing the force applied to the multiple welded joints between the busbar module BM and the multiple stator coils 3u, 3v, 3w and the power lines 50u, 50v, 50w. As a result, the durability of these welded joints can be ensured, and the electrical connection state between the multiple stator coils 3u, 3v, 3w and the power lines 50u, 50v, 50w and the busbar module BM can be well maintained.

[0039] Furthermore, in the bus module BM, the inner circumferential surface Si of the hole H is inclined towards the center of the hole H as it approaches the coil end 3a. Therefore, even if misalignment occurs between the nozzle N for introducing adhesive A and the hole H, adhesive A can flow smoothly along the inclined inner circumferential surface Si towards the bridging portion BR and the coil end 3a. As a result, the amount of adhesive A used can be suppressed, and the time required for fixing the bus module BM can be shortened. Moreover, the hole H tapers towards the coil end 3a, therefore, as... Figure 8 As shown, this also increases the contact area between the adhesive A and the inner circumferential surface Si of the hole H, thereby improving the fixing strength of the module body BB relative to the coil end 3a.

[0040] Furthermore, in the aforementioned busbar module BM, each bridging portion BR is formed as a cylindrical rod with an outer diameter smaller than the thickness of the module body BB. This suppresses stress on the adhesive A that cures upon adhering to the bridging portion BR, effectively maintaining the bond strength between the bridging portion BR and the adhesive A. Moreover, each bridging portion BR is positioned within its corresponding hole H close to the surface of the coil end 3a side of the module body BB. This ensures that a sufficient amount of adhesive A is left around the bridging portion BR to increase the contact area between the adhesive A and the module body BB. However, the bridging portion BR is not limited to a circular cross-sectional shape; it can also have an elliptical or a polygonal cross-sectional shape without corners, as long as stress on the adhesive A that cures upon adhering to the bridging portion BR can be suppressed.

[0041] Furthermore, in the aforementioned busbar module BM, the bridging portion BR is formed in the module body BB extending radially in the stator core 2. This ensures that the opening area on both sides of the bridging portion BR is sufficiently and appropriately guaranteed while suppressing an increase in the radial length of the hole H in the stator core 2, thus effectively ensuring the strength of the module body BB, which has a shorter radial length in the stator core 2. However, in the busbar module BM, the bridging portion BR can also be formed within the hole H, extending circumferentially in the stator core 2.

[0042] Furthermore, such as Figure 9 As shown, a bridging portion BR′ composed of two intersecting (orthogonal) rods can also be formed within the hole H of the busbar module BM. In this technical solution, opening areas OA are ensured on both sides of each rod constituting the bridging portion BR′, and the contact area between the bridging portion BR′ and the adhesive A is increased. Furthermore, although not shown in the figure, the bridging portion can also be formed by multiple rods extending in a grid or radial pattern. Moreover, the busbar module BM can have at least one hole H and a bridging portion BR, or it can have three or more.

[0043] Furthermore, the aforementioned busbar module BM includes a busbar Bn that forms the neutral points of multiple stator coils 3u, 3v, and 3w, and connects the multiple stator coils 3u, 3v, and 3w to the corresponding power lines 50u, 50v, and 50w respectively, but is not limited thereto. That is, the busbar module BM may only have the function of connecting the multiple stator coils 3u, 3v, and 3w to the corresponding power lines 50u, 50v, and 50w respectively, or it may only have the function of forming the neutral points of multiple stator coils 3u, 3v, and 3w.

[0044] Furthermore, it has been explained that the aforementioned bus module BM is applied to a stator 1 comprising multiple stator coils 3u, 3v, and 3w formed by electrically connecting multiple segmented coils 4, but is not limited thereto. That is, the bus module BM can also be applied to, for example... Figure 10 As shown, a stator 1B is formed by electrically connecting multiple box-type coils (concentrated wound coils) 400 to form multiple stator coils. The box-type coils 400 are formed as follows: before being installed onto the stator core 2B, a flat wire with a cross-section, for example, having a rectangular shape (including a square shape), is wound along a winding shaft in a manner along the outer peripheral surface of the teeth 2t of the stator core 2B in multiple turns (in...). Figure 10 In the example, it is 2 laps or 1 lap.

[0045] Furthermore, the stator coils 3u, 3v, and 3w of the stator 1 are connected using a double-star connection (2Y connection), but this is not a limitation. That is, the stator coils 3u, 3v, and 3w can also be connected using methods other than 2Y connections, such as single-star (1Y) connection, 4Y connection, or delta connection. Additionally, the bus module BM can be fixed to the end face (upper end face) of the stator core 2 via adhesive A introduced into the hole H. Furthermore, adhesive A can be a thermosetting resin other than a high-viscosity varnish, provided it has a relatively high viscosity.

[0046] As explained above, the stator of this disclosure is a stator (1, 1B) comprising a stator core (2, 2B), stator coils (3u, 3v, 3w) wound around the stator core (2, 2B), and a busbar module (BM) electrically connected to the stator coils (3u, 3v, 3w) and fixed to a coil end (3a) formed at one end of the stator core (2). In this stator (1, 1B), the busbar module (B) includes conductive retaining components (Bu, B). The module body (BB) of v, Bw, Bn), the hole (H) through which the module body (BB) passes, and the bridging part (BR), wherein the bridging part (BR) extends from a part of the inner peripheral surface (Si) of the hole (H) to other parts of the inner peripheral surface (Si) in such a way that the interior of the hole (H) is divided into multiple opening regions (OA), and is fixed to the coil end (3a) by an adhesive (A) that is introduced into the hole (H) and cured.

[0047] The stator disclosed herein includes a busbar module electrically connected to a stator coil and fixed to the coil end, which is formed on one end of the stator core. Furthermore, the busbar module body has a hole through which adhesive is introduced, and a bridging portion fixed to the coil end by adhesive cured within the hole. The bridging portion extends from a portion of the inner circumferential surface of the hole to other portions of the inner circumferential surface, dividing the interior of the hole into multiple opening regions. Thus, opening regions are formed on both sides of the bridging portion, allowing the adhesive introduced into the hole to reach the coil end through these opening regions after contacting the bridging portion. As a result, the adhesive can be attached to the bridging portion in a manner that surrounds it, and the adhesive can be attached to the inner circumferential surface of the hole, ensuring sufficient contact area between the adhesive and the module body. Furthermore, by forming openings on both sides of the bridging portion, the adhesive adheres to and cures on the inner circumferential surfaces of the bridging portion and the hole at a position more fully inward than the periphery of the module body. This increases the fixing strength of the module body relative to the coil end compared to introducing adhesive into the through groove at the periphery of the module body. Therefore, in the stator of this disclosure, the busbar module can be more firmly fixed to the coil end formed on one end of the stator core using adhesive, and the electrical connection between multiple stator coils and the busbar module can be well maintained.

[0048] Furthermore, the inner circumferential surface (Si) of the hole (H) can be inclined towards the center of the hole (H) as it approaches the coil end (3a). This allows the adhesive to flow smoothly along the inclined inner circumferential surface towards the bridging portion and the coil end, even if misalignment occurs between the nozzle or other adhesive nozzle and the hole. As a result, the amount of adhesive used is reduced, and the time required for fixing the busbar module is shortened. Moreover, the hole tapers towards the coil end, increasing the contact area between the adhesive and the inner circumferential surface of the hole, thereby improving the fixing strength of the module body relative to the coil end.

[0049] Furthermore, the bridging portion (BR) can be formed on the module body (BB) in a manner that extends radially in the stator core (2, 2B). This ensures sufficient and appropriate opening area on both sides of the bridging portion.

[0050] Furthermore, the bridging portion (BR) can have a cross-sectional shape without corners. This suppresses stress in the adhesive that cures upon adhesion to the bridging portion, thus maintaining good bond strength between the bridging portion and the adhesive.

[0051] Furthermore, the bridging portion (BR) can be formed as a cylindrical rod with an outer diameter smaller than the thickness of the module body (BB), and is disposed within the hole (H) close to the surface of the coil end (3a) side of the module body (BB). This allows for good maintenance of the adhesive strength between the bridging portion and the adhesive, and leaves a sufficient amount of adhesive around the bridging portion to increase the contact area between the adhesive and the module body.

[0052] Additionally, multiple stator coils (3u, 3v, 3w) can be wound around the stator core (2, 2B), the bus module (BM) can form the neutral point of multiple stator coils (3u, 3v, 3w), and the multiple stator coils (3u, 3v, 3w) can be connected to the corresponding power lines (50u, 50v, 50w) respectively.

[0053] The busbar module disclosed herein is a busbar module (BM) electrically connected to and fixed to a stator coil (3u, 3v, 3w) of a stator core (2, 2B) wound on a stator (1, 1B) and formed at one end of the stator core (2) at a coil end (3a). The busbar module (BM) includes: a module body (BB) holding conductive components (Bu, Bv, Bw, Bn); a hole (H) through which the module body (BB) passes; and a bridging portion (BR) extending from a portion of the inner circumferential surface of the hole (H) to other portions of the inner circumferential surface (Si) in a manner that divides the interior of the hole (H) into multiple opening regions (OA), and is fixed to the coil end (3a) via an adhesive (A) that is introduced into the hole (H) and cured. In this busbar module, the module body can be more securely fixed to the coil end formed at one end of the stator core using an adhesive.

[0054] Furthermore, the technical solution disclosed herein is not limited to the above-described embodiments in any way, and various modifications can be made within the scope of this disclosure. Moreover, the above-described embodiments are merely one specific way of the technical solution described in the summary section of the invention, and do not limit the elements of the technical solution described in the summary section of the invention.

[0055] Industrial applicability

[0056] The technical solution disclosed herein can be applied in industries such as the manufacturing of rotating electric machines and stators.

Claims

1. A stator characterized by, Possessing: a stator core; a stator coil wound on the stator core; and a busbar module that is electrically connected to the stator coil and fixed to a coil end portion formed on one end side of the stator core, the busbar module including a module main body that holds a conductive member, a hole portion that penetrates the module main body, and a bridge portion that has a cross-sectional shape without a corner and extends from a part of an inner peripheral surface of the hole portion to another part of the inner peripheral surface in a manner that divides an inside of the hole portion into a plurality of opening regions, fixed to the coil end portion via an adhesive cured by being introduced into the hole portion, the bridge portion is formed in a round bar shape having an outer diameter smaller than a thickness of the module main body, and is disposed in the hole portion in a manner that approaches a surface of the coil end portion side of the module main body.

2. The stator according to claim 1, characterized in that the inner peripheral surface of the hole portion is inclined in a manner that approaches a central portion of the hole portion toward the coil end portion side.

3. The stator according to claim 1 or 2, characterized in that the bridge portion is formed on the module main body in a manner that extends in a radial direction of the stator core.

4. The stator according to claim 1 or 2, characterized in that a plurality of the stator coils are wound on the stator core, the busbar module forms neutral points of the plurality of the stator coils, and connects the plurality of the stator coils to corresponding power lines, respectively.

5. The stator according to claim 3, characterized in that a plurality of the stator coils are wound on the stator core, the busbar module forms neutral points of the plurality of the stator coils, and connects the plurality of the stator coils to corresponding power lines, respectively.

6. A busbar module electrically connected to a stator coil and fixed to a coil end portion, the stator coil being wound around a stator core of a stator, the coil end portion being formed on one end side of the stator core, characterized by, the busbar module possesses: a module main body that holds a conductive member; a hole portion that penetrates the module main body; and a bridge portion that has a cross-sectional shape without a corner and extends from a part of an inner peripheral surface of the hole portion to another part of the inner peripheral surface in a manner that divides an inside of the hole portion into a plurality of opening regions, fixed to the coil end portion via an adhesive cured by being introduced into the hole portion, the bridge portion is formed in a round bar shape having an outer diameter smaller than a thickness of the module main body, and is disposed in the hole portion in a manner that approaches a surface of the coil end portion side of the module main body.

Images