Stator for outer rotor type rotating electric machine and method of assembling same

Abstract

To improve the workability of attaching a connection terminal and reduce costs in a stator for an outer rotor type rotating electric machine in which a coil is wound around each of a plurality of salient poles provided on the outer periphery of a stator core via a bobbin, and a lead wire of the coil and an external conductor are connected to a conductive metal connection terminal disposed on the bobbin at one end in the axial direction and inward in the radial direction of the stator core.SOLUTION: A terminal holder 26 is attached to a bobbin 14, the terminal holder having an insertion hole 30 through which a part of a connection terminal 23 and an external conductor 25 can be inserted, and formed in a member different from the bobbin 14, the terminal holder to which the connection terminal 23 is attached, and an adhesive 37 that fills a space between the connection terminal 23 and the terminal holder 26 while covering a connecting portion of a lead wire 24 and the connection terminal 23 and a connecting portion of the connection terminal 23 and the external conductor 25 in the insertion hole 30 is applied to the terminal holder 26.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an improvement to a stator for an outer rotor type rotating electric machine in which coils are wound via bobbins around multiple salient poles provided on the outer periphery of a stator core, and lead wires and external conductors of the coils are connected to connecting terminals made of conductive metal arranged on the bobbins at one axial end side and radially inward side of the stator core, as well as an improvement to a method of assembling a stator for an outer rotor type rotating electric machine. [Background technology]

[0002] A stator for an outer rotor type rotating electric machine in which a connection terminal is directly attached to a bobbin is known in Patent Document 1. Meanwhile, Patent Document 2 discloses a stator in which a coil wound around a stator core via a bobbin is immersed in an epoxy resin liquid in order to ensure electrical insulation between the lead wires from the coil of the connection terminal and the connection portion of the external conductor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4344695 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-333787 Summary of the Invention [Problem to be solved by the invention]

[0004] In the stator for an outer rotor type rotating electric machine disclosed in Patent Document 1, the stator core with the coil wound around the bobbin is large and heavy, and attaching the connection terminal requires handling a large and heavy object, making it difficult to say that the workability is excellent. Furthermore, if the insulation structure disclosed in Patent Document 2 is adopted, a device is required to immerse the entire coil wound around the stator core around the bobbin in an epoxy resin liquid, which may increase costs.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a stator for an outer rotor type rotating electric machine that improves the ease of installing connection terminals and reduces costs, and a method for assembling the same. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a stator for an outer rotor type rotating electric machine, in which coils are wound around a plurality of salient poles provided on the outer periphery of a stator core via bobbins, and lead wires of the coils and external conductors are connected to conductive metal connection terminals arranged on the bobbins at one axial end side and a radially inner side of the stator core, by inserting a part of the connection terminals. and The external conductor can be inserted. Each connection terminal is provided with one With through holes At the same time, The bobbin is formed as a separate member. hand, The first feature is that a terminal holder to which the connection terminal is attached is attached to the bobbin, and adhesive is applied to the terminal holder to fill in the space between the connection terminal and the terminal holder while covering the connection portion of the lead wire and the connection terminal and the connection portion of the connection terminal and the external conductor within the insertion hole.

[0007] In addition to the configuration of the first feature, the present invention has a second feature in that the terminal holder has a flat holder main part integral with it that abuts against an attachment plate part formed on the bobbin and has one end of the insertion hole opening on one side facing the opposite side from the holder attachment plate part, and an adhesive reservoir part surrounding the one end opening of the insertion hole and the connection part of the connection terminal and the lead wire attached to the terminal holder is formed on the one side of the holder main part so as to enable the connection part of the connection terminal and the lead wire to be filled with the adhesive.

[0008] In addition to the configuration of the second characteristic, the present invention has a third characteristic in that the adhesive storage portion is formed by the one surface of the holder main portion and a peripheral wall portion that defines the outer periphery of the adhesive storage portion, continues endlessly, and protrudes integrally from the one surface of the holder main portion, and a groove is formed in the protruding end of the peripheral wall portion into which a portion of the lead wire is inserted.

[0009] The present invention provides Second or In addition to the configuration of the third feature, a fourth feature is that the connection terminal comprises a flat plate-like portion that abuts against the one surface of the holder main portion, and an insertion portion that is integrally connected to the plate-like portion so as to enable connection to the external conductor and insertion into the insertion hole, and so as to position the connection portion with the external conductor within the insertion hole when the plate-like portion abuts against the one surface.

[0010] A fifth feature of the present invention is that, in addition to the configuration of the fourth feature, the terminal holder has a positioning hole that opens to one side of the holder main part, and the connection terminal has a clamping plate portion that is integrally connected to the plate-shaped part and allows the end of the lead wire to be inserted between it and the plate-shaped part and tightened, and a positioning protrusion that is integrally connected to the plate-shaped part and allows it to be fitted into the positioning hole.

[0011] The present invention provides a stator for an outer rotor type rotating electric machine, in which coils are wound via bobbins around a plurality of salient poles provided on the outer periphery of a stator core, and lead wires of the coils and external conductors are connected to connection terminals made of conductive metal and disposed on the bobbins at one axial end side and a radially inward side of the stator core; a terminal holder, formed as a separate member from the bobbin and having an insertion hole that allows insertion of a portion of the connection terminal and insertion of the external conductor, and to which the connection terminal is attached, is attached to the bobbin; an adhesive is applied to the terminal holder, covering the connection portion of the lead wire and the connection terminal and the connection portion of the connection terminal and the external conductor within the insertion hole and filling the gap between the connection terminal and the terminal holder; and the connection terminal has an insertion portion that allows connection to the external conductor and insertion into the insertion hole and that positions the connection portion with the external conductor within the insertion hole, A sixth feature is that the terminal holder is provided with a leakage prevention structure that prevents the adhesive from the adhesive reservoir from leaking through the inner surface of the insertion hole and the gap between the insertion portions.

[0012] In addition to the sixth characteristic feature, the present invention further comprises: A seventh feature is that the insertion hole is composed of a through hole drilled in the holder main part and a tubular part that is coaxially connected to the through hole and has one end integrally connected to the holder main part, at least the other end side of the tubular part is formed in a tapered shape that becomes smaller in diameter as it moves away from the holder main part, and the leakage prevention structure is composed of the small diameter end on the other end side of the tubular part and the outer periphery of the external conductor.

[0013] In addition to any one of the first to seventh features, the present invention has an eighth feature in that the adhesive is an insulating epoxy resin.

[0014] Furthermore, the present invention has a ninth feature in that, in connecting the external conductor and the lead wire to the connection terminal, the following steps are sequentially carried out: inserting the external conductor into the insertion hole of the terminal holder separated from the bobbin; connecting the external conductor inserted into the insertion hole to the connection terminal; attaching the terminal holder to the bobbin with the coil wound around the stator core via the bobbin; attaching the connection terminal to the terminal holder while accommodating the connection portion with the external conductor in the insertion hole; connecting the lead wire to the connection terminal; and applying the adhesive to the terminal holder. [Effects of the Invention]

[0015] According to the first feature of the present invention, the connection terminal is attached to the terminal holder, which is a separate member from the bobbin, and the terminal holder is then attached to the bobbin. This allows the connection terminal to be attached without having to handle the stator core, which is large and heavy with the coil wound around it via the bobbin, improving the workability of attaching the connection terminal. The terminal holder has an insertion hole provided for each of the connection terminals, allowing insertion of a part of the connection terminal and insertion of an external conductor therethrough, An adhesive is applied to the terminal holder, covering the connection portion of the lead wire and the connection terminal, as well as the connection portion of the connection terminal and the external conductor within the insertion hole, and filling the space between the connection terminal and the terminal holder.This eliminates the need for a device that immerses the entire coil wound around the stator core in adhesive, while ensuring electrical insulation at the connection portion of the lead wire and the external conductor to the connection terminal, thereby reducing costs.

[0016] According to a second feature of the present invention, an adhesive reservoir surrounding one end opening of the insertion hole and the connection portion of the connection terminal and the lead wire is formed on one side of the holder main body, and the connection portion of the connection terminal and the lead wire can be covered with adhesive from the adhesive reservoir, thereby preventing leakage of adhesive and stabilizing the finished shape.

[0017] According to a third feature of the present invention, a groove into which a portion of the lead wire is inserted is formed at the protruding end of the endless peripheral wall portion that defines the outer periphery of the adhesive reservoir portion, thereby enabling the tip of the lead wire to be reliably immersed in the adhesive in the adhesive reservoir portion.

[0018] According to the fourth feature of the present invention, when the connection terminal abuts its plate-shaped portion against the holder main portion, the insertion portion of the connection terminal is positioned within the insertion hole, so that the connection portion of the external conductor and the connection terminal can be stably held within the insertion hole.

[0019] According to the fifth feature of the present invention, a clamping plate portion is integrally connected to the plate-shaped portion of the connection terminal, which allows the lead wire to be clamped between the plate-shaped portion and the clamping plate portion, making it easy to connect the lead wire to the connection terminal.Furthermore, a positioning protrusion that fits into a positioning hole formed in the main holder portion of the terminal holder is integrally connected to the plate-shaped portion, making it possible to position the connection terminal relative to the terminal holder and stably hold the connection portion of the external conductor to the insertion portion within the insertion hole.

[0020] According to the sixth feature of the present invention, a leakage prevention structure that prevents the adhesive from leaking is provided in the terminal holder. Therefore, by applying the adhesive so that it accumulates in the adhesive reservoir, not only is the connection portion of the lead wire and the connection terminal covered with adhesive, but the connection portion of the connection terminal and the external conductor is also covered and the space between the connection terminal and the terminal holder is filled, while preventing the adhesive from leaking toward the inside of the stator. This requires only a simple application of adhesive to the adhesive reservoir, making the insulation work using adhesive easy and efficient.

[0021] According to a seventh feature of the present invention, the insertion hole is composed of a through hole drilled in the holder main part and a tubular part coaxially connected to the through hole and integrally connected to the holder main part, and at least a portion of the tubular part is tapered, and the small diameter end of the tubular part and the outer periphery of the external conductor form a leakage prevention structure, thereby making it possible to form a leakage prevention structure while suppressing an increase in the number of parts.

[0022] Furthermore, according to the assembly method of the ninth aspect of the present invention, an external conductor inserted into an insertion hole of a terminal holder separated from a bobbin is connected, and the connection terminal to which the external conductor is connected is attached to the bobbin, and then an output wire is connected to the connection terminal, and then adhesive is applied to the terminal holder. This makes it easy to connect the stay external conductor, which is large and heavy when a coil is wound around it via the bobbin, to the connection terminal, and also makes it easy to attach the connection terminal to the bobbin, improving the workability of attaching the connection terminal, and also ensures electrical insulation of the connection parts of the output wire and the external conductor to the connection terminal, thereby reducing costs. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a longitudinal cross-sectional view of the fan motor of the first embodiment, taken along line 1-1 in FIG. 2. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 2 is a simplified exploded perspective view of the stator before the terminal holder is attached. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 2. [Figure 5] 5 is a cross-sectional view taken along line 5-5 in FIG. 4. [Figure 6] FIG. [Figure 7] FIG. 5 is a cross-sectional view of the second embodiment corresponding to FIG. 4. [Figure 8] FIG. 5 is a cross-sectional view of the third embodiment corresponding to FIG. 4. [Figure 9] FIG. 11 is a longitudinal sectional view of a fourth embodiment corresponding to FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] A first embodiment of the present invention will be described with reference to FIGS. 1 to 6. 1O 2, the outer rotor type rotating electric machine of this embodiment is a fan motor, and comprises a stator 10 fixed to a support member 12 and a rotor 11 covering the stator 10, and a fan (not shown) is attached to the rotor 11.

[0026] The stator 10 is configured by winding a plurality of coils 15 including U-poles, V-poles, and W-poles via synthetic resin bobbins 14 around a plurality of salient poles 13a projecting from the outer periphery of a cylindrical stator core 13 formed by laminating and bonding a plurality of magnetic steel plates, and the support protrusions 13b are provided at a plurality of locations, for example, four locations, circumferentially equally spaced on the inner periphery of the stator core 13 and fastened to the support member 12 with bolts 19. The support protrusions 13b may be formed integrally with the stator core 13, or may be configured by bonding a member separate from the stator core 13 to the stator core 13.

[0027] The rotor 11 is configured by a rotor case 16 made of a magnetic metal and having a plurality of permanent magnets 18 mounted on it. The rotor case 16 integrally includes a cylindrical outer cylinder portion 16a coaxially surrounding the stator 10, a cylindrical shaft portion 16b coaxially disposed radially inside the stator 10, and an end wall portion 16c connecting one end of the outer cylinder portion 16a and the shaft portion 16b. The permanent magnets 18 are mounted on the inner circumferential surface of the outer cylinder portion 16a while facing the stator core 13 from the outside in the radial direction. In this embodiment, the rotor case 16 is made of a magnetic metal. However, for example, a ring-shaped yoke made of a magnetic metal may be press-fitted onto the inner circumferential surface of the outer cylinder portion 16a of the rotor case 16 made of a material other than magnetic metal, and the permanent magnets 18 may be mounted on the inner circumferential surface of the yoke. In this case, the plurality of permanent magnets 18 are mounted on the rotor case 16 via the yoke.

[0028] The support member 12 integrally includes a cylindrical portion 12a that coaxially surrounds the shaft portion 16b with one end facing the end wall portion 16c of the rotor case 16, and a plurality of support flanges 12b that protrude radially outward from a plurality of positions on the other end of the cylindrical portion 12a. The support flanges 12b protrude from the cylindrical portion 12a in correspondence with the support protrusions 13b provided on the stator core 13, and the bolts 19 inserted into the support protrusions 13b are screwed into the support flanges 12b. The shaft portion 16b of the rotor case 16 is rotatably supported by the cylindrical portion 12a of the support member 12 via a pair of ball bearings 20.

[0029] 3 to 5, a connecting terminal 23 made of conductive metal is arranged on the bobbin 14 at one axial end side and radially inward of the stator core 13, and lead wires 24 of the coils 15 and external conductors 25 are connected to this connecting terminal 23. At one axial end side of the stator core 13, outside each coil 15, jumper wires 21 connected to those coils 15 are arranged, and the lead wires 24 extend from these jumper wires 21 radially inward of the stator core 13 and are connected to the connecting terminal 23.

[0030] The connection terminal 23 is attached to a terminal holder 26 which is a separate member from the bobbin 14 , and the terminal holder 26 is attached to the bobbin 14 .

[0031] Flat mounting plate portions 14a projecting radially inward are formed integrally with the bobbin 14 at one axial end of the stator core 13. The flat mounting plate portions 14a are positioned between the support protrusions 13b. Terminal holders 26 are attached to selected mounting plate portions 14a. In this embodiment, the terminal holders 26 are attached to three of the four mounting plate portions 14a positioned between the four support protrusions 13b.

[0032] The selected mounting plate portion 14a is provided with a through hole 27 extending in an arc shape along the circumferential direction of the stator 10, and a pair of engagement holes 28 positioned to sandwich the through hole 27 on both sides in the circumferential direction.

[0033] The terminal holder 26 has a flat holder main portion 26a formed in an arc shape extending long along the circumferential direction of the stator 10 and having a size sufficient to close the through hole 27, and abuts against the mounting plate portion 14a, a fitting protrusion 26b integrally protruding from the holder main portion 26a and fitted into the through hole 27, and a fitting hole 26b. 8 and a pair of engaging claws 26c integrally connected to the holder main portion 26a at positions sandwiching the fitting protrusion 26b from both sides in the circumferential direction while being engaged with the fitting protrusion 26b.

[0034] The holder main portion 26a has a surface 26aa facing the opposite side to the mounting plate portion 14a, and has a portion where a part of the connection terminal 23 is inserted. and The terminal holder 26 is provided with a terminal hole 26a for allowing the external conductor 25 to be inserted therethrough. In addition, each connection terminal 23 has one One end of the insertion hole 30 is open, and this insertion hole 30 is composed of a through hole 31 drilled in the holder main part 26a and a tubular part 32 that is coaxially connected to the through hole 31 and has one end integrally connected to the holder main part 26a.

[0035] In addition, one end of a bottomed positioning hole 33 provided in the terminal holder 26 is opened on one surface 26aa of the holder main part 26a so that a portion of the connection terminal 23 can be fitted into it, and this positioning hole 33 is positioned outside the insertion hole 30 in the radial direction of the stator 10.

[0036] The insertion hole 30 and the positioning hole 33 form a pair for one connection terminal 23, and in this embodiment, since three connection terminals 23 are attached to one terminal holder 26, the pair of insertion hole 30 and positioning hole 33 are arranged in the terminal holder 26 at three locations spaced apart circumferentially around the stator 10.

[0037] Referring also to Figure 6, the connection terminal 23 is formed integrally with: a flat plate-shaped portion 23a abutting against the one surface 26aa of the holder main portion 26a; an insertion portion 23b integrally connected to the plate-shaped portion 23a and the fitting protrusion 26b, which enables connection to the external conductor 25 and insertion into the insertion hole 30, and which, when the plate-shaped portion 23a abuts against the one surface 26aa, positions the connection portion with the external conductor 25 within the insertion hole 30; a clamping plate portion 23c integrally connected to the plate-shaped portion 23a, which enables the end of the lead wire 24 to be inserted between the clamping plate portion 23a and tightened; and a positioning protrusion 23d integrally connected to the plate-shaped portion 23a, which enables fitting into the positioning hole 33.

[0038] The insertion portion 23b is composed of a connecting plate portion 23ba having a rectangular cross section, one end of which is integrally connected to the plate-like portion 23a and inserted into the insertion hole 30, and a wire connection portion 23bb connected to the other end of the connecting plate portion 23ba, the wire connection portion 23bb being formed in a cylindrical shape with one circumferentially extending axial slit 34 so that the external wire 25 inserted into the wire connection portion 23bb can be crimped and connected. Moreover, the length of the insertion portion 23b is set so that the wire connection portion 23bb will be within the insertion hole 30 when the plate-like portion 23a is in contact with one surface 26aa of the holder main portion 26a.

[0039] In this embodiment, in addition to the three connection terminals 23, a common connection terminal 35 for connecting three neutral wires 36 extending from the crossover wire 21 is attached to the holder main portion 26a of the terminal holder 26.

[0040] When the connection terminal 23 to which the external conductor 25 and the output wire 24 are connected and the common connection terminal 35 to which three neutral wires 36 are connected are attached to the terminal holder 26 and the terminal holder 26 is attached to the mounting plate portion 14a of the bobbin 14, an adhesive 37 is applied to the terminal holder 26, covering the connection portion of the output wire 24 and the connection terminal 23, the connection portion of the neutral wire 36 and the common connection terminal 35, and the connection portion of the connection terminal 23 and the external conductor 25 within the insertion hole 30, and filling the space between the connection terminal 23 and the terminal holder 26.

[0041] The adhesive 37 is an insulating epoxy resin, such as an epoxy-modified silicone elastic adhesive or an acrylic-modified silicone resin. The terminal holder 26 may be made of any material that the adhesive can adhere to, and may be made of the same synthetic resin as the bobbin 14 or a different synthetic resin from the bobbin 14.

[0042] On the one surface 26aa side of the holder main part 26a, an adhesive reservoir 38 is formed which surrounds one end opening of the insertion hole 30, one end opening of the positioning hole 33, the connection portion of the connection terminal 23 and the lead wire 24 attached to the terminal holder 26, and the connection portion of the common connection terminal 23 and the neutral wire 36, making it possible to fill the connection portion of the connection terminal 23 and the lead wire 24 and the connection portion of the common connection terminal 35 and the neutral wire 36 with the adhesive 37.

[0043] The adhesive reservoir 38 is formed by the one surface 26aa of the holder main part 26a and a peripheral wall part 26d that protrudes integrally from the one surface 26aa of the holder main part 26a, continuing endlessly and defining the outer periphery of the adhesive reservoir 38. In this embodiment, the peripheral wall part 26d protrudes integrally from the holder main part 26a, rising from the outer peripheral edge of the holder main part 26a.

[0044] The protruding end of the peripheral wall portion 26d is formed with grooves 39 for inserting portions of the lead wires 24, one for each of the three connection terminals 23, and three grooves 40 for inserting portions of the three neutral wires 36 connected to the common connection terminal 35.

[0045] Referring to Figures 4 and 5, the terminal holder 26 is provided with a leakage prevention structure 41A that prevents the adhesive 37 from the adhesive reservoir 38 from leaking through the gap between the inner surface of the insertion hole 30 and the insertion portion 23b. In this embodiment, the leakage prevention structure 41A is formed by providing a heat shrink tube 42 between the end of the tubular portion 32 opposite the holder main portion 26a and the external conductor 25.

[0046] When connecting the external conductor 25 and the lead wire 24 to the connection terminal 23, the following steps are sequentially performed: inserting the external conductor 25 into the insertion hole 30 of the terminal holder 26, which is separated from the bobbin 14; connecting the external conductor 25, which is inserted into the insertion hole 30, to the connection terminal 23; attaching the terminal holder 26 to the bobbin 14 with the coil 15 wound around the stator core 13 via the bobbin 14; attaching the connection terminal 23 and the common connection terminal 35 to the terminal holder 26 while accommodating the connection portion with the external conductor 25 in the insertion hole 30; connecting the lead wire 24 to the connection terminal 23 and the neutral wire 36 to the common connection terminal 35; and applying the adhesive 37 to the terminal holder 26.

[0047] Next, the operation of the first embodiment will be described. and The external conductor 25 can be inserted. Each of the connection terminals 23 is provided with one of the With insertion hole 30 At the same time, The bobbin 14 is formed as a separate member. 、 Because the terminal holders 26 to which the connection terminals 23 are attached are attached to the bobbins 14, the connection terminals 23 can be attached without handling the stator core 13, which is large and heavy with the coils 15 wound around the bobbins 14, thereby improving the workability of attaching the connection terminals 23. Furthermore, the adhesive 37 that fills the gap between the connection terminals 23 and the terminal holders 26 while covering the connection portions of the lead wires 24 and the connection terminals 23, the connection portions of the neutral wire 36 and the common connection terminal 35, and the connection portions of the connection terminals 23 and the external conductors 25 within the insertion holes 30, is applied to the terminal holders 26. Therefore, it is possible to ensure electrical insulation at the connection portions of the lead wires 24 and the external conductors 25 to the connection terminals 23 while eliminating the need for a device that immerses the entire coil 15 wound around the stator core 13 in adhesive, and to reduce costs.

[0048] Furthermore, the terminal holder 26 has a flat holder main part 26a integrally therewith, which abuts against the mounting plate part 14a formed on the bobbin 14 and has one end of the insertion hole 30 opening on one surface 26aa facing the opposite side to the mounting plate part 14a, and an adhesive reservoir part 38 surrounding the one end opening of the insertion hole 30 and the connection part of the connection terminal 23 and the lead wire 24 attached to the terminal holder 26, as well as the connection part of the common connection terminal 35 and the neutral wire 36, is formed on the one surface 26aa side of the holder main part 26a so as to enable the connection part of the connection terminal 23 and the lead wire 24, as well as the connection part of the common connection terminal 35 and the neutral wire 36, to be filled with the adhesive 37, thereby preventing leakage of the adhesive 37 and stabilizing the finished shape.

[0049] Furthermore, the adhesive reservoir 38 is formed by the one surface 26aa of the holder main part 26a and a peripheral wall part 26d that protrudes integrally from the one surface 26aa of the holder main part 26a, continuing endlessly and defining the outer periphery of the adhesive reservoir 38, and a groove 39 for inserting a portion of the lead wire 24 and a groove 40 for inserting a portion of the neutral wire 36 are formed at the protruding end of the peripheral wall part 26d, so that the tips of the lead wire 24 and the neutral wire 36 can be reliably immersed in the adhesive 37 in the adhesive reservoir 38.

[0050] Furthermore, the connection terminal 23 comprises a flat plate-shaped portion 23a that abuts against the one surface 26aa of the holder main portion 26a, and an insertion portion 23b that is integrally connected to the plate-shaped portion 23a, enabling connection to the external conductor 25 and insertion into the insertion hole 30, and that positions the connection portion with the external conductor 25 within the insertion hole 30 when the plate-shaped portion 23a abuts against the one surface 26aa.Therefore, when the connection terminal 23 abuts its plate-shaped portion 23a against the holder main portion 26a, the connection portion between the external conductor 25 and the connection terminal 23 can be stably held within the insertion hole 30.

[0051] In addition, a positioning hole 33 opening into the one surface 26aa of the holder main portion 26a is formed in the terminal holder 26, and the connection terminal 23 is equipped with a clamping plate portion 23c that is integrally connected to the plate-shaped portion 23a and allows the end of the lead wire 24 to be inserted between it and the plate-shaped portion 23a and tightened, and a positioning protrusion 23d that is integrally connected to the plate-shaped portion 23a and allows it to fit into the positioning hole 33, making it easy to connect the lead wire 24 to the connection terminal 23, and also making it possible to position the connection terminal 23 with respect to the terminal holder 26 and stably hold the connection portion of the external conductor 25 to the insertion portion 23b within the insertion hole 30.

[0052] The insertion hole 30 is composed of a through hole 31 drilled in the holder main portion 26a, and a cylindrical portion 32 that is coaxially connected to the through hole 31 and has one end integrally connected to the holder main portion 26a. A leakage prevention structure 41A is provided between the cylindrical portion 32 and one of the external conductor 25 and the insertion portion 23b, and the external conductor 25, and the adhesive 37 from the adhesive reservoir portion 38 to prevent leakage via the inner surface of the insertion hole 30 and the gap between the insertion portion 23b. By applying adhesive 37 to the stator 10, not only are the connection portions of the lead wire 24 and the connection terminal 23 and the connection portion of the neutral wire 36 and the common connection terminal 35 covered with adhesive 37, but the connection portions of the connection terminal 23 and the external conductor 25 are also covered, and the gap between the connection terminal 23 and the terminal holder 26 is filled, while preventing the adhesive 37 from leaking inside the stator 10. This requires only a simple application of adhesive 37 to the adhesive reservoir 38 once, making the insulation work using adhesive 37 easy and efficient.

[0053] Furthermore, when connecting the external conductor 25 and the lead wire 24 to the connection terminal 23, the process includes a step of inserting the external conductor 25 into the insertion hole 30 of the terminal holder 26 separated from the bobbin 14, a step of connecting the external conductor 25 inserted into the insertion hole 30 to the connection terminal 23, a step of attaching the terminal holder 26 to the bobbin 14 in a state in which the coil 15 is wound around the stator core 13 via the bobbin 14, a step of attaching the connection terminal 23 and the common connection terminal 35 to the terminal holder 26 while accommodating the connection portion with the external conductor 25 in the insertion hole 30, a step of connecting the lead wire 24 to the connection terminal 23 and the neutral wire 36 to the common connection terminal 35, and a step of attaching the terminal holder 26 to the bobbin 14 in a state in which the coil 15 is wound around the stator core 13 via the bobbin 14. The steps of applying adhesive 37 to 26 are carried out sequentially. Therefore, the external conductor 25 inserted into the insertion hole 30 of the terminal holder 26, which is separated from the bobbin 14, is connected, the connection terminal 23 with the external conductor 25 connected is attached to the bobbin 14, and the lead wire 24 and neutral wire 36 are connected to the connection terminal 23 and the common connection terminal 35. Then, adhesive 37 is applied to the terminal holder 26. This facilitates the connection of the external conductor 26 to the connection terminal 23 and the attachment of the connection terminal 23 to the bobbin 14, thereby improving the workability of attaching the connection terminal 23. It is also possible to ensure electrical insulation at the connection portions of the lead wire 24 and external conductor 25 to the connection terminal 23 and the connection portion of the neutral wire 36 to the common connection terminal 35, thereby reducing costs.

[0054] Next, second to fourth embodiments of the present invention will be described with reference to Figures 7 to 9, respectively. Parts corresponding to those in the first embodiment will be shown with the same reference numerals, and detailed descriptions will be omitted.

[0055] Referring to Figure 7, a second embodiment of the present invention will be described. A leakage prevention structure 41B is provided on the terminal holder 26 to prevent the adhesive 37 from the adhesive reservoir 38 from leaking through the gap between the inner surface of the insertion hole 30 and the insertion portion 23b. The leakage prevention structure 41B may be configured by a heat-shrinkable tube 45 having one end tightly fitted to the wire connection portion 23bb of the insertion portion 23b and the other end of which is attached to the outer periphery of the external wire 25 outside the tubular portion 32, and which tightly fits the outer surface of the heat-shrinkable tube 45 to tightly contact the inner surface of the insertion hole 30.

[0056] A third embodiment of the present invention will be described with reference to FIG. 8. and The external conductor 25 can be inserted. Each of the connection terminals 23 is provided with one of the The insertion hole 47 is composed of a through hole 31 drilled in the holder main portion 26a and a tubular portion 48 coaxially connected to the through hole 31 and having one end integrally connected to the holder main portion 26a, at least the other end of the tubular portion 48 being tapered, and in this embodiment, the tubular portion 48 is configured as a tapered portion 48a from the intermediate portion in the longitudinal direction to the other end. A leakage prevention structure 41C provided in the terminal holder 26 to prevent the adhesive 37 from leaking out through the gap between the inner surface of the insertion hole 30 and the insertion portion 23b is composed of the small-diameter end on the other end of the tubular portion 48, i.e., the small-diameter end of the tapered portion 48a, and the outer periphery of the external conductor 25, and the inner diameter of the small-diameter end of the tapered portion 48a is set so that the inner periphery of the small-diameter end is close to or approximately close to the outer periphery of the external conductor 25. According to the third embodiment, the leakage prevention structure 41C can be configured while suppressing an increase in the number of parts.

[0057] Furthermore, as a fourth embodiment of the present invention, as shown in FIG. 9, the stator 10 may be covered with a covering portion 50 molded from synthetic resin, except for a part of the inner periphery and the outer periphery.

[0058] The above describes an embodiment of the present invention, but the present invention is not limited to the above embodiment, and various design modifications can be made without departing from the present invention described in the claims.

[0059] For example, the present invention can be applied not only to the fan motor described in the embodiment but also to a power generator. [Explanation of symbols]

[0060] 13. Stator core 13a... Salient pole 14. Bobbin 15. Coil 23 Connection terminal 23a Plate-shaped part 23b Insertion part 23c...Holding plate part 23d Positioning protrusion 24···Outlet wire 25...External conductor 26 Terminal holder 26a...Holder main part 26aa...one side 26d...Peripheral wall part 30, 47... Through hole 31...Through hole 33 Positioning hole 37. Adhesive 38 Adhesive reservoir 39...Groove 41A, 41B, 41C...Leakage prevention structure 48...Cylinder part

Claims

1. A stator for an outer rotor type rotating electric machine, in which coils (15) are wound around a plurality of salient poles (13a) provided on the outer periphery of a stator core (13) via bobbins (14), and lead wires (24) of the coils (15) and external conductors (25) are connected to connecting terminals (23) made of conductive metal disposed on the bobbins (14) at one axial end side and a radially inner side of the stator core (13), a terminal holder (26) formed as a separate member from the bobbin (14) and to which the connection terminals (23) are attached is attached to the bobbin (14); and an adhesive (37) is applied to the terminal holder (26) to fill in the gap between the connection terminals (23) and the terminal holder (26) while covering the connection portions of the lead wires (24) and the connection terminals (23) and the connection portions of the connection terminals (23) and the external conductors (25) within the insertion holes (30, 47).

2. 2. The stator for an outer rotor type rotating electric machine according to claim 1, wherein the terminal holder (26) has a flat plate-shaped holder main portion (26a) integrally therewith, the flat plate-shaped holder main portion (26a) being in contact with an attachment plate portion (14a) formed on the bobbin (14) and having one end of the insertion hole (30, 47) opening on one surface (26aa) facing the opposite side from the attachment plate portion (14a), and an adhesive reservoir portion (38) surrounding the one end opening of the insertion hole (30, 47) and the connection portion of the connection terminal (23) and the lead wire (24) attached to the terminal holder (26) is formed on the one surface (26aa) side of the holder main portion (26a) so as to enable the connection portion of the connection terminal (23) and the lead wire (24) to be filled with the adhesive (37).

3. 3. The stator for an outer rotor type rotating electric machine according to claim 2, wherein the adhesive reservoir portion (38) is formed by the one surface (26aa) of the holder main portion (26a) and a peripheral wall portion (26d) that protrudes integrally from the one surface (26aa) of the holder main portion (26a) while defining the outer periphery of the adhesive reservoir portion (38) and continuing endlessly, and a groove (39) is formed in the protruding end of the peripheral wall portion (26d) into which a portion of the lead wire (24) is inserted.

4. 4. The stator for an outer rotor type rotating electric machine according to claim 2, wherein the connection terminal (23) comprises: a flat plate-shaped portion (23a) abutting against the one surface (26aa) of the holder main portion (26a); and an insertion portion (23b) integrally connected to the plate-shaped portion (23a) so as to enable connection with the external conductor (25) and insertion into the insertion hole (30, 47), and so as to position the connection portion with the external conductor (25) within the insertion hole (30, 47) when the plate-shaped portion (23a) abuts against the one surface (26aa).

5. 5. The stator for an outer rotor type rotating electric machine according to claim 4, wherein the terminal holder (26) has a positioning hole (33) that opens into the one surface (26aa) of the holder main portion (26a), and the connection terminal (23) has a clamping plate portion (23c) that is integrally connected to the plate-shaped portion (23a) and enables the end of the output wire (24) to be inserted between the clamping plate portion (23c) and the plate-shaped portion (23a) and tightened, and a positioning protrusion (23d) that is integrally connected to the plate-shaped portion (23a) and enables it to be fitted into the positioning hole (33).

6. A stator for an outer rotor type rotating electric machine, in which coils (15) are wound via bobbins (14) around a plurality of salient poles (13a) provided on the outer periphery of a stator core (13), and lead wires (24) and external conductors (25) of the coils (15) are connected to connecting terminals (23) made of conductive metal arranged on the bobbins (14) at one axial end side and radially inward side of the stator core (13), A terminal holder (26) formed as a separate member from the bobbin (14) and having an insertion hole (30, 47) that allows insertion of a portion of the connection terminal (23) and insertion of the external conductor (25), and to which the connection terminal (23) is attached, is attached to the bobbin (14), and an adhesive (37) is applied to the terminal holder (26) to fill in the gap between the connection terminal (23) and the terminal holder (26) while covering the connection portion of the lead wire (24) and the connection terminal (23) and the connection portion of the connection terminal (23) and the external conductor (25) within the insertion hole (30, 47); the connection terminal (23) is provided with an insertion portion (23b) that allows connection with the external conductor (25) and insertion into the insertion hole (30, 47) and that allows the connection portion with the external conductor (25) to be disposed within the insertion hole (30, 47); a leakage prevention structure (41A, 41B, 41C) provided in the terminal holder (26) for preventing the adhesive (37) from the adhesive reservoir (38) from leaking through the inner surface of the insertion hole (30, 47) and the gap between the insertion portion (23b).

7. 7. The stator for an outer rotor type rotating electric machine according to claim 6, wherein the insertion hole (47) is composed of a through hole (31) drilled in the holder main portion (26 a) and a tubular portion (48) coaxially connected to the through hole (31) and having one end integrally connected to the holder main portion (26 a), at least the other end side of the tubular portion (48) is formed in a tapered shape whose diameter decreases as it moves away from the holder main portion (26 a), and the leakage prevention structure (41C) is composed of the small-diameter end on the other end side of the tubular portion (48) and an outer periphery of the external conductor (25).

8. 8. The stator for an outer rotor type rotating electric machine according to claim 1, wherein the adhesive (37) is an insulating epoxy resin.

9. A method for assembling a stator for an outer rotor type rotating electric machine according to any one of claims 1 to 8, When connecting the external conductor (25) and the lead wire (24) to the connection terminal (23), the steps include inserting the external conductor (25) into the insertion holes (30, 47) of the terminal holder (26) that is separated from the bobbin (14), connecting the external conductor (25) that is inserted into the insertion holes (30, 47) to the connection terminal (23), and connecting the coil (15) to the stator core (13) via the bobbin (14). a terminal holder (26) attached to the bobbin (14) in a wound state; a connection terminal (23) attached to the terminal holder (26) while accommodating the connection portion with the external conductor (25) in the insertion hole (30, 47); a connection terminal (23) attached to the terminal holder (26) while accommodating the connection portion with the external conductor (25) in the insertion hole (30, 47); a connection terminal (24) attached to the connection terminal (23); and a process of applying the adhesive (37) to the terminal holder (26).

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