Motor and fan device

Abstract

To provide a motor capable of easily connecting a terminal and a substrate while improving a heat dissipation effect.SOLUTION: A motor includes: a terminal electrically connected to a winding lead from a coil; and a substrate in which a driver circuit for supplying a power to the coil is formed. The substrate comprises a substrate main body and a connection member. The substrate main body comprises: a metal base plate; an insulating layer laminated on a surface of the base plate; and a wiring pattern formed on the insulating layer. The connection member includes: a bus bar having a first connection piece electrically connected to the wiring pattern and a second connection piece extending from an outer peripheral edge of the substrate main body and electrically connected to the terminal; and a bus bar holder formed by an insulating material and supporting the bus bar and fixed to the substrate main body.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a motor and a fan device equipped with the motor. [Background technology]

[0002] In recent years, efforts have been made to promote the Sustainable Development Goals (2030 Agenda for Sustainable Development, adopted at the United Nations Summit on September 25, 2015, hereafter referred to as "SDGs"). Accordingly, technologies that aim to reduce waste and defective products in order to ensure sustainable production and consumption patterns have become well known.

[0003] Conventionally, there is known a motor that includes terminals to which the leads of the windings drawn from the stator coil are crimped, and a circuit board that is electrically connected to the terminals. A driver circuit that supplies power is mounted on the circuit board. The driver circuit can pass a current through the coil to generate a magnetic field.

[0004] In the motor described in Patent Document 1, the substrate on which the driver circuit is mounted has electronic components mounted on the surface where the stator is located, and lands for connecting terminals are formed on the back surface opposite the surface on which the electronic components are mounted. Such substrates are double-sided substrates, such as glass epoxy substrates, with wiring patterns formed on both sides. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-135029 Summary of the Invention [Problem to be solved by the invention]

[0006] The motor described in Patent Document 1 uses a glass epoxy substrate, which has insufficient heat dissipation, making it difficult to obtain high output. Therefore, it is conceivable to use a metal substrate (e.g., an aluminum substrate) with a high heat dissipation effect instead of the glass epoxy substrate. However, with a metal substrate, it is not possible to form lands for connecting terminals on the back surface, making it impossible to connect the wiring pattern to the terminals in the same way as with a glass epoxy substrate, resulting in a problem of complicated connection work.

[0007] An object of the present invention is to provide a motor that improves heat dissipation efficiency and allows easy connection between terminals and a circuit board. [Means for solving the problem]

[0008] In order to achieve the above object, the motor of the present invention comprises a terminal electrically connected to a winding drawn out from a coil, and a substrate on which a driver circuit for supplying power to the coil is formed, the substrate comprising a substrate main body and a connecting member, the substrate main body comprising a metal base plate, an insulating layer laminated on the surface of the base plate, and a wiring pattern formed on the insulating layer, the connecting member comprising a bus bar having a first connecting piece electrically connected to the wiring pattern and a second connecting piece extending from the outer peripheral edge of the substrate main body and electrically connected to the terminal, and a bus bar holder formed from an insulating material, supporting the bus bar, and fixed to the substrate main body. [Effects of the Invention]

[0009] According to the present invention, it is possible to improve the heat dissipation effect while easily connecting the terminal and the board, thereby improving the efficiency of the work. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a fan device according to an embodiment; [Figure 2] FIG. 2 is an exploded perspective view of the motor and the fan. [Figure 3] 1 is a vertical cross-sectional view of a motor according to an embodiment of the present invention; [Figure 4] FIG. 2 is a perspective view of the front side of the motor, showing the configuration of the motor with the rotor removed. [Figure 5] FIG. 2 is a perspective view of the rear side of the motor, showing the configuration of the motor with the driver case and rotor removed. [Figure 6] FIG. [Figure 7] FIG. 2 is a perspective view of the bus bar, the terminal, and the periphery of the terminal holder. [Figure 8] FIG. 2 is a perspective view of the substrate as viewed from the component mounting surface side. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 2 is a cross-sectional view of a main portion of the motor taken along the bus bar, the terminal, and the vicinity of the terminal holder. [Figure 13] FIG. 2 is a side view of the motor viewed from the depth direction of the board. [Figure 14] 10A and 10B are explanatory diagrams illustrating a soldering process between a terminal and a bus bar. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Overall configuration of fan unit 1] First, the overall configuration of a fan device 1 will be described with reference to Figures 1 and 2. Figure 1 is an external perspective view showing an example of the configuration of a fan device 1 according to an embodiment. Figure 2 is an exploded perspective view of a motor 2 and a fan 3.

[0012] 1 and 2, the fan device 1 includes a motor 2 as a drive source, and a fan 3 that is rotationally driven by the motor 2 to generate cooling air. The fan device 1 is disposed, for example, in an engine compartment so that the motor 2 faces the engine and the fan 3 faces the radiator.

[0013] The fan 3 is fastened to the motor 2 by a plurality of screws 10. The screws 10 are fastened from the front side of the fan 3 (the side opposite to the side facing the motor 2) through threaded holes formed in a boss portion 31 that forms the center of the fan 3 to the rotor yoke 232 of the motor 2. Note that it is not necessary to use the screws 10 as fastening members for fastening the fan 3 to the motor 2; there are no particular restrictions on the number of screws or the type of fastening member as long as the fan 3 can be fastened to the motor 2.

[0014] The fan 3 has a boss portion 31 that rotates integrally with the rotor 23 around the axis of the shaft 21 (see Figure 3), a plurality of blades 32 (seven in this embodiment) that extend radially from the outer periphery of the boss portion 31, and a plurality of connecting members 33 (seven in this embodiment) that connect adjacent blades 32 at their tips.

[0015] Boss portion 31 includes a disk-shaped disk portion 311 and a cylindrical peripheral wall portion 312 that protrudes from the outer edge of disk portion 311 toward motor 2 and has a plurality of blades 32 attached thereto. When fan 3 is attached to motor 2, disk portion 311 faces connecting wall 232C (see FIG. 3) of rotor yoke 232, and peripheral wall portion 312 surrounds outer peripheral wall 232A (see FIG. 3) of rotor yoke 232.

[0016] [Overall configuration of Motor 2] The configuration of the motor 2 will be described with reference to Figures 3 and 4. Figure 3 is a vertical cross-sectional view of the motor 2. Figure 4 is a perspective view of the front side of the motor 2, showing the configuration of the motor 2 with the rotor 23 removed.

[0017] As shown in FIGS. 3 and 4, the motor 2 is a so-called "mechanically integrated" electric motor that includes an outer rotor brushless motor 11 and a substrate 13 on which a driver circuit 12 is mounted.

[0018] In addition to the brushless motor 11, the driver circuit 12, and the board 13, the motor 2 includes a motor bracket 14, a driver case 15, a terminal holder 16 (see FIG. 4), terminals 17A to 17C (see FIG. 4), and a connector unit 18.

[0019] Brushless motor 11 is supported by motor bracket 14. Brushless motor 11 is disposed on one side (front side) in the thickness direction of motor bracket 14. Driver case 15 is fastened to the other side (back side) in the thickness direction of motor bracket 14 with a plurality of screws.

[0020] In addition, a connector unit 18, which combines two connectors to which an external harness is connected, is attached to the end of the motor bracket 14. The brushless motor 11, driver circuit 12, and connector unit 18 are electrically connected.

[0021] As shown in FIG. 3, brushless motor 11 includes shaft 21, a plurality of bearings 22 provided on the outer periphery of shaft 21, rotor 23 rotatably supported around the axis of shaft 21 via bearings 22, and annular stator 24 fixed to rotor 23 at a predetermined radial distance.

[0022] The shaft 21 is a fixed shaft fixed to the surface side of the motor bracket 14. In the following description of the components of the motor 2, the axial direction of the shaft 21 will be simply referred to as the "axial direction," the radial direction about the axis of the shaft 21 will be simply referred to as the "radial direction," and the circumferential direction about the axis of the shaft 21 will be simply referred to as the "circumferential direction."

[0023] The rotor 23 has a plurality of permanent magnets 231 arranged at equal intervals in the circumferential direction so as to surround the outer periphery of the stator 24, and a rotor yoke 232 that supports the plurality of permanent magnets 231 and is rotatably supported on the shaft 21.

[0024] Rotor yoke 232 is disposed on the surface side of motor bracket 14 so as to be concentric with the axis of shaft 21. Rotor yoke 232 is rotatably supported on shaft 21 via a plurality of bearings 22. Rotor yoke 232 further includes an outer peripheral wall 232A, an inner peripheral wall 232B, and a connecting wall 232C.

[0025] The outer peripheral wall 232A has a cylindrical outer shape. The outer peripheral wall 232A is disposed radially outward of the stator 24. The inner peripheral surface of the outer peripheral wall 232A supports a plurality of permanent magnets 231. In other words, the plurality of permanent magnets 231 are fixed to the inner peripheral surface of the outer peripheral wall 232A at predetermined intervals in the circumferential direction.

[0026] The inner circumferential wall 232B has a cylindrical outer shape and is disposed radially inward of the stator 24. The inner circumferential wall 232B is rotatably supported by the shaft 21 via a plurality of bearings 22.

[0027] The connecting wall 232C has a disk-shaped outer shape. The connecting wall 232C connects one axial end of the outer circumferential wall 232A and one axial end of the inner circumferential wall 232B. The connecting wall 232C is disposed on the opposite side of the stator 24 from the motor bracket 14. The connecting wall 232C is disposed opposite the stator 24 with a predetermined gap therebetween in the axial direction.

[0028] [Configuration of Stator 24] The stator 24 is housed in a space surrounded by the outer peripheral wall 232A, the inner peripheral wall 232B, the connecting wall 232C, and the surface of the motor bracket 14. The stator 24 is fixed to the surface side of the motor bracket 14, radially inward of the multiple permanent magnets 231. The stator 24 faces the multiple permanent magnets 231 across a predetermined radial gap.

[0029] 4, stator 24 has a cylindrical stator core 241, insulating stator insulators 242 attached to both axial sides of a plurality of teeth protruding radially outward from stator core 241, and coil 243 wound with a wire on stator insulator 242. Coil 243 is a conductive wire and is formed from, for example, a copper wire.

[0030] The stator 24 generates a magnetic field when a current flows through the coil 243. Then, the rotor yoke 232 rotates around the axis of the shaft 21 due to attractive and repulsive forces generated between the magnetic field generated by the coil 243 and the plurality of permanent magnets 231.

[0031] The driver circuit 12 supplies power to the multiple coils 243 and controls the generation of magnetic fields by the multiple coils 243. The driver circuit 12 is composed of multiple electronic components (e.g., transistors, diodes, resistors, etc.) surface-mounted on the surface of the substrate 13 facing the motor bracket 14. Note that the electronic components that make up the driver circuit 12 are not arranged on the back side of the substrate 13 facing the driver case 15.

[0032] [Motor bracket 14 configuration] Fig. 5 is a perspective view of the rear side of the motor 2, showing the configuration of the motor 2 without the driver case 15 and the rotor 23. Fig. 6 is an exploded perspective view of the components arranged on the rear side of the motor bracket 14.

[0033] 5 and 6, the board 13 is fastened to the motor bracket 14 with a plurality of screws 25. A terminal holder 16 is provided on the back side of the motor bracket 14 (the side facing the board 13). The motor bracket 14 has an opening 14A. The opening 14A passes through the motor bracket 14 from the front side to the back side, allowing the lead portion 244 of the winding forming the coil 243 to be drawn out to the back side of the motor bracket 14.

[0034] [Terminal 17A-17C Configuration] Terminals 17A to 17C electrically connect driver circuit 12 and coils 243. Brushless motor 11 has three terminals 17A to 17C to supply three-phase (U-phase, V-phase, and W-phase) power to multiple coils 243. In other words, brushless motor 11 is a three-phase AC motor. In this embodiment, brushless motor 11 has a total of 12 coils 243, four for each phase. Terminals 17A to 17C are made of conductive metal. Terminals 17A to 17C are held by holding portions 16A to 16C of terminal holder 16.

[0035] As shown in Fig. 7, terminal 17A has a main body 26 and a terminal portion 27 that are integrally formed. Main body 26 has a U-shaped cross section and includes two mating pieces 26A and 26B. Mating pieces 26A and 26B fit into mating grooves 37A and 37B of terminal holder 16. Mating pieces 26A and 26B are arranged parallel to each other. Note that while Fig. 7 illustrates the configuration of terminal 17A, terminals 17B and 17C have the same configuration as terminal 17A.

[0036] Each of the fitting pieces 26A and 26B has four slits 28. Lead portions 244 of the windings drawn out from the coil 243 are crimped into the slits 28. The terminal portion 27 has a plurality of connection terminals 29A to 29C, and is electrically connected to the driver circuit 12 via a connection member 42 described below. The connection terminals 29A to 29C are formed in a tapered shape that narrows toward the tip.

[0037] [Configuration of Terminal Holder 16] 6, terminal holder 16 has holding portions 16A to 16C, an opening 16D, and a positioning hole 16E. Terminal holder 16 is made of an insulating material (e.g., resin). Holding portions 16A to 16C hold terminals 17A to 17C, respectively, and also hold lead portions 244 of the windings crimped into slits 28 of terminals 17A to 17C. Opening 16D penetrates terminal holder 16 from the front side to the back side, allowing lead portions 244 of the windings forming coil 243 to be drawn out to the back side of terminal holder 16.

[0038] As shown in FIG. 7, the holding portion 16A is formed with a plurality of accommodating grooves 36 and fitting grooves 37A and 37B. Note that while FIG. 7 only shows the configuration of the holding portion 16A, the holding portions 16B and 16C also have the same configuration. The accommodating grooves 36 accommodate the lead portions 244 of the winding drawn out from the coil 243. In this embodiment, the holding portion 16A has four accommodating grooves 36 and holds four lead portions 244. Note that the number of lead portions of the winding held in one holding portion can be changed appropriately depending on the number of coils 243 and the number of phases of power supplied to the coils 243, and the number of accommodating grooves 36 and slits in the terminals 17A to 17C can also be changed accordingly.

[0039] The fitting grooves 37A and 37B are formed to fit the dimensions of the fitting pieces 26A and 26B of the terminal 17A. As a result, when the lead portion 244 is crimped into the slit 28, the fitting pieces 26A and 26B simultaneously fit into the fitting grooves 37A and 37B, allowing the terminal 17A to be held by the holding portion 16A.

[0040] [Configuration of board 13] As shown in FIGS. 8 and 9 , the substrate 13 includes a substrate main body 41, connecting members 42, and screws 43. The substrate main body 41 is a metal substrate. In this embodiment, the substrate main body 41 is an aluminum substrate and includes a metal base plate 44, an insulating layer 45 laminated on the surface of the base plate 44 (the surface facing the motor bracket 14), a wiring pattern 46 formed on the insulating layer 45, and electronic components 47 mounted on the wiring pattern 46. The wiring pattern 46 is formed of, for example, copper foil. The base plate 44 is made of an aluminum-based metal with high thermal conductivity. The base plate 44 conducts heat to the driver case 15 by contacting the driver case 15 or via an adhesive or the like. This allows heat generated in the substrate 13 to be dissipated to the outside of the motor 2 via the driver case 15.

[0041] [Configuration of the board body 41] The substrate body 41 is in the shape of a substantially rectangular plate and has a notch 41A, a through hole 41B, a positioning hole 41C, and a positioning groove 41D. The connection member 42 is fixed to the substrate body 41. The attachment of the connection member 42 to the substrate body 41 will be described later.

[0042] The cutout portion 41A is a cutout portion formed by cutting out one side 41E of the substrate main body 41 so as to have a concave shape facing inward. The through holes 41B are located at both ends of the cutout portion 41A, and screws 43 are inserted therethrough. The positioning holes 41C and the positioning grooves 41D are located near the through holes 41B, and are fitted with first positioning pins 61A and 61B of the connecting member 42, which will be described later.

[0043] The positioning holes 41C are through holes that penetrate the substrate body 41, and the positioning grooves 41D are grooves cut out from the outer periphery of the substrate body 41. Whether to use the positioning holes 41C or the positioning grooves 41D can be changed as appropriate depending on the layout of the substrate body 41; when the positioning holes 41C open near the outer periphery of the substrate body 41, they are positioning grooves 41D, and when the positioning holes 41C are located a certain distance from the outer periphery of the substrate body 41 and other openings, they are formed as positioning holes 41C.

[0044] [Configuration of connecting member 42] Connection member 42 includes bus bars 51, nuts 52, and bus bar holders 53. Three bus bars 51 are provided in one connection member 42, matching the number of terminals 17A to 17C described above.

[0045] The busbar holder 53 is made of an insulating material (e.g., resin) and supports the busbar 51. Nuts 52 are integrated with the busbar holder 53. Specifically, the busbar 51 and nuts 52 are insert-molded into the busbar holder 53. The busbar holder 53 is formed in the shape of a long, narrow plate extending along one side 41E of the board main body 41. Note that, hereinafter, the extension direction of the busbar holder 53 (the direction along one side 41E of the board main body 41) will be simply referred to as the "extension direction," the thickness direction of the board main body 41 and the base plate 44 perpendicular to the extension direction will be simply referred to as the "thickness direction," and the depth direction of the board main body 41 and the base plate 44 perpendicular to the extension direction and the thickness direction will be simply referred to as the "depth direction." The nut 52 has a female screw hole 52A formed therein. The female screw hole 52A is threadedly engaged with a screw 43.

[0046] [Configuration of busbar 51] The three bus bars 51 are arranged in parallel with each other in the extension direction X. The bus bars 51 are formed from a conductive metal plate and extend in the depth direction Y.

[0047] 10 , the bus bar 51 includes a first connection piece 56, a second connection piece 57, and an intermediate portion 58. The intermediate portion 58 connects the first connection piece 56 and the second connection piece 57, and is insert-molded into the bus bar holder 53. The first connection piece 56 is located on the side of the intermediate portion 58 that is closer to the board body 41. The second connection piece 57 is located on the side of the intermediate portion 58 that is farther from the board body 41. In other words, the second connection piece 57 is provided at a position that extends from the outer periphery of the board body 41.

[0048] The first connection piece 56 and the second connection piece 57 are located on the side closer to the board body 41 than the intermediate portion 58 in the thickness direction Z. In other words, the bus bar 51 has a shape that is bent in a substantially V-shape when viewed from the extension direction X. In the thickness direction Z, the second connection piece 57 is located closer to the board body 41 than the first connection piece 56.

[0049] The first connection piece 56 is provided so as to be aligned with the surface 41F of the substrate body 41 on which the wiring pattern 46 is formed. The wiring pattern 46 is formed of, for example, copper foil. The first connection piece 56 is soldered to the wiring pattern 46 of the substrate body 41. In this way, the first connection piece 56 is electrically connected to the wiring pattern 46.

[0050] The second connection piece 57 extends from the outer periphery of the board body 41 to a position where it connects with the connection terminals 29A-29C of the terminals 17A-17C. The second connection piece 57 is aligned with the back surface 41G (the surface opposite to the front surface 41F) of the board body 41 where the base plate 44 is exposed. That is, when the first connection piece 56 is fixed to the front surface 41F of the board body 41 on which the wiring pattern 46 is formed, the second connection piece 57 is flush with the back surface 41G of the board body 41. In addition, in order to maintain an insulating distance between the base plate 44 and the intermediate portion 58 (a distance that prevents short-circuiting between conductors), the intermediate portion 58 is positioned at a predetermined distance L1 from the base plate 44.

[0051] 11, each of the second connection pieces 57 has three land portions 57A to 57C. The land portions 57A to 57C are portions for soldering to the connection terminals 29A to 29C of the terminals 17A to 17C, respectively. Reference numeral 60 denotes solder that adheres when the land portions 57A to 57C and the connection terminals 29A to 29C are soldered together.

[0052] The land portions 57A to 57C have through holes 59 that penetrate in the thickness direction Z. The connection terminals 29A to 29C are inserted into the through holes 59. The second connection piece 57 is electrically connected to the driver circuit 12 via the terminals 17A to 17C, and is connected to the patterns of the output terminals of each phase in the driver circuit 12.

[0053] The lands 57A to 57C and through holes 59 formed on the bus bars 51 are arranged in a straight line parallel to the extension direction X (see FIG. 14). In this embodiment, the lands 57A are arranged in a straight line, and the lands 57B and 57C are arranged in another straight line.

[0054] As shown in Fig. 12, the terminals 17A to 17C enter through holes 59 in the land portions 57A to 57C from the front surface 41F of the board body 41 and are electrically connected to the second connection piece 57 on the back surface 41G of the board body 41. Specifically, the connection terminals 29A to 29C of the terminals 17A to 17C inserted into the through holes 59 are soldered to the land portions 57A to 57C of the second connection piece 57. As a result, the terminals 17A to 17C are connected to the output terminals of each phase of the driver circuit 12. Note that Fig. 12 only shows the cross section of the terminal 17A, but the cross sections of the terminals 17B and 17C are similar.

[0055] The terminal portion 27 of the terminal 17A branches into three connection terminals 29A to 29C, and the second connection piece 57 similarly branches into three land portions 57A to 57C in order to reduce the area and volume of the heated portion during the soldering process and shorten the time required for the soldering process.

[0056] Furthermore, a notch 57D (see FIG. 11) is formed between land portion 57A and land portion 57B. That is, land portion 57A and land portion 57B are spaced apart at the portion where notch 57D is formed. This prevents solder 60 from adhering to land portion 57B when soldering land portion 57A to connection terminal 29A, and prevents solder 60 from adhering to land portion 57A when soldering land portion 57B to connection terminal 29B. That is, excess solder adhering during a previous soldering step does not interfere with the operation of the soldering iron in the next soldering step.

[0057] [Configuration of busbar holder 53] As shown in FIG. 11 , the bus bar holder 53 is integrally formed with first positioning pins 61A and 61B that are positioned relative to the board body 41. The first positioning pin 61A is formed in a cylindrical shape and fits into the positioning hole 41C. The first positioning pin 61B has an oval cross-sectional shape and fits into the positioning groove 41D. This determines the position of the connection member 42 relative to the board body 41 in the extension direction X and the depth direction Y. The shapes of the first positioning pins 61A and 61B can be changed as appropriate depending on the layout of the board body 41 and whether they are fitted into the positioning hole 41C or the positioning groove 41D.

[0058] Nuts 52 are disposed on both ends of bus bar holder 53. After bus bar holder 53 is positioned relative to board body 41, nuts 52 are threadedly engaged with screws 43 inserted into through holes 41B. That is, connecting member 42 is fastened to board body 41 by screws 43. As a result, connecting member 42 is attached to board body 41 along notch portion 41A.

[0059] Further, second positioning pins 62 (see FIG. 8) for positioning the bus bar holder 53 relative to the terminal holder 16 are integrally formed. The second positioning pins 62 are fitted into positioning holes 16E (see FIG. 6) of the terminal holder 16. This determines the position of the substrate 13 relative to the terminal holder 16 and the terminals 17A to 17C held by the terminal holder 16 in the extension direction X and depth direction Y.

[0060] 12, at least a portion of busbar holder 53 is located inside cutout portion 41A, and its position in thickness direction Z overlaps with that of board main body 41. This allows busbar holder 53 to have a larger dimension in thickness direction Z, improving its rigidity. Therefore, busbar holder 53 attached to board main body 41 does not bend, and the positions of busbars 51 relative to terminals 17A to 17C do not shift.

[0061] 13, when viewed from the thickness direction Z, the bus bar holder 53 is formed so that the thickness dimension D1 of the portion overlapping with the lead portion 244 held by the terminal 17A is small, and the thickness dimension D2 of the portion not overlapping with the lead portion 244 is larger than the thickness dimension D1. This prevents an increase in the dimension of the board 13 in the thickness direction, making it possible to make the board 13 more compact. Note that in FIG. 13, the terminal 17C and the terminal holder 16 are not shown to avoid complication of the drawing.

[0062] [Motor 2 assembly process] Next, the process for assembling the motor 2 will be described. First, with the stator 24 fixed to the motor bracket 14, the terminal holder 16 is attached to the back surface of the motor bracket 14. The terminal holder 16 is fastened to the motor bracket 14 with a number of screws. When attaching the terminal holder 16 to the motor bracket 14, the lead portion 244 of the winding forming the coil 243 is drawn out to the back surface side of the terminal holder 16 through the openings 14A and 16D (see FIG. 6).

[0063] Lead portions 244 of multiple windings drawn out from coil 243 are inserted into accommodating grooves 36 of holding portions 16A to 16C. After inserting lead portions 244 into accommodating grooves 36, lead portions 244 are crimped into slits 28 of terminals 17A to 17C. This allows terminals 17A to 17C and lead portions 244 to be held in holding portions 16A to 16C. When lead portions 244 are crimped into slits 28, the surface coating is stripped off. This electrically connects terminals 17A to 17C to lead portions 244.

[0064] After connecting the terminals 17A to 17C and the lead portion 244, the board 13 is attached to the motor bracket 14. First, the second positioning pins 62 are fitted into the positioning holes 16E of the terminal holder 16 to position them, and the connection terminals 29A to 29C are inserted through the through holes of the land portions 57A to 57C. Then, the board 13 is fastened to the motor bracket 14 with the screws 25.

[0065] After the board 13 is fastened to the motor bracket 14, the lands 57A to 57C of the board 13 are soldered to the connection terminals 29A to 29C of the terminals 17A to 17C, thereby electrically connecting the driver circuit 12 and the coil 243 via the terminals 17A to 17C.

[0066] As shown in FIG. 14, the land portions 57A to 57C and the through holes 59 formed on the multiple bus bars 51 are arranged in a straight line parallel to the extension direction X. Therefore, when performing the soldering process, multiple soldering can be performed at once simply by moving the soldering iron 65 with solder attached in the extension direction X and pausing it at the position of the land portions 57A to 57C.

[0067] As described above, in the motor 2 of the present invention, the substrate 13 includes the substrate main body 41 and the connecting member 42. The substrate main body 41 includes the metal base plate 44, the insulating layer 45, and the wiring pattern 46 formed on the insulating layer 45. The connecting member 42 includes the bus bar 51 having the first connecting piece 56 electrically connected to the wiring pattern 46 and the second connecting piece 57 extending from the outer periphery of the substrate main body 41 and electrically connecting to the terminals 17A-17C, and the bus bar holder 53 formed of an insulating material, supporting the bus bar 51, and fixed to the substrate main body 41. This allows the substrate main body 41, a metal substrate with high heat dissipation efficiency, to be used, and the second connecting piece 57 extends to the positions of the terminals 17A-17C, facilitating the process of connecting the substrate 13 to the terminals 17A-17C. This improves the efficiency of the assembly of the motor 2. Furthermore, the improved heat dissipation effect provided by the substrate 13 allows the higher-output motor 2 to be used in fan devices for internal combustion engines. Furthermore, since the substrate 13 and the terminals 17A to 17C can be connected with ease, the burden on the worker is reduced and the yield rate is improved.

[0068] Furthermore, in the present invention, second connection piece 57 is formed with through-hole 59 penetrating in thickness direction Z, and terminals 17A to 17C enter through-hole 59 from front surface 41F of board body 41 and are electrically connected to second connection piece 57 on back surface 41G of board body 41. This allows the soldering process to be performed on the back surface side of board body 41, where the soldering iron can easily reach, facilitating the process of connecting board 13 and terminals 17A to 17C. If lands for connecting terminals were formed on the front surface of the board (the surface having the wiring pattern), the space for inserting the soldering iron would be narrow and the work would be difficult, but this does not happen with the present invention.

[0069] Furthermore, when first connection piece 56 is fixed to front surface 41F of substrate body 41 on which wiring pattern 46 is formed, second connection piece 57 is flush with back surface 41G of substrate body 41, facilitating the soldering process of connecting substrate 13 to terminals 17A-17C. This is because the position on back surface 41G of substrate body 41 where the soldering process is performed is the same as the position where the soldering process between terminals and lands is performed in motors using conventional double-sided substrates (e.g., glass epoxy substrates). In other words, conventional motors and motor 2 of the present invention can be assembled on the same soldering process line, eliminating the need to change line equipment and further reducing costs.

[0070] Furthermore, in the present invention, nuts 52 are integrated with bus bar holder 53, and screws 43 inserted into board body 41 are threadedly engaged with nuts 52. This facilitates the process of assembling board 13. Second connection pieces 57 are provided with through holes 59 arranged in parallel, and are soldered to connection terminals 29A to 29C inserted into the through holes. This allows multiple soldering to be performed at once. This means that the task of connecting terminals 17A to 17C to board 13 is facilitated.

[0071] The above-described embodiments are merely examples for explaining the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can make appropriate modifications without departing from the spirit of the present invention. [Explanation of symbols]

[0072] 2 motors 11 Brushless motor 12 Driver circuit 13 PCB 13A through hole 13B Land 14 Motor bracket 14A opening 15 Driver Case 16 Terminal holder 16A~16C Holding part 16D opening Terminals 17A~17C 18 Connector unit 21 Shaft 22 Bearings 23 Rotor 24 Stator 25 screws 26 Main body 26A, 26B mating piece 27 Terminal section 28 Slit 29 Connection terminal 29A~29C connection terminals 36 Storage groove 37A, 37B fitting groove 41 Board body 41A Notch 41B female screw hole 41C Positioning hole 41D Positioning groove 41E Side 41F One side 41G The Other Side 42 Connecting member 43 screws 44 Base plate 45 Insulating layer 46 Wiring Pattern 47 Electronic Components 51 Busbar 52 Nut 52A female screw hole 53 Busbar holder 56 First connecting piece 57 Second connecting piece 57A~57C Land section 57D Notch 58 Middle section 59 Through Hole 60 Solder 61A, 61B First positioning pin 62 Second positioning pin 65 Soldering iron 231 Permanent Magnets 232 rotor yoke 232A Outer wall 232B Inner wall 232C Connecting wall 241 stator core 242 Stator insulator 243 Coil 244 Lead section D1, D2 thickness dimensions L1 distance X extension direction Y depth direction Z thickness direction

Claims

1. a terminal electrically connected to the winding drawn from the coil; a substrate on which a driver circuit for supplying power to the coil is formed, the substrate includes a substrate body and a connection member; The substrate body is A metal base plate, an insulating layer laminated on a surface of the base plate; a wiring pattern formed on the insulating layer, The connecting member is a bus bar having a first connection piece electrically connected to the wiring pattern and a second connection piece extending from an outer periphery of the substrate body and electrically connected to the terminal; a bus bar holder formed from an insulating material, supporting the bus bar, and fixed to the substrate body.

2. a through hole penetrating the second connection piece in a thickness direction of the base plate; The motor according to claim 1, characterized in that the terminal enters the through hole from the front surface side of the substrate body and is electrically connected to the second connecting piece on the back surface side opposite the front surface of the substrate body.

3. The motor described in claim 1, characterized in that when the first connection piece is fixed to the surface of the substrate body on which the wiring pattern is formed, the second connection piece is flush with the back surface opposite the surface of the substrate body.

4. 2. The motor according to claim 1, wherein the bus bar holder is integral with a nut that is threadedly engaged with a screw inserted through the board body.

5. the bus bar includes an intermediate portion connecting the first connection piece and the second connection piece, The motor according to claim 1 , wherein the first connecting piece and the second connecting piece are located on a side of the intermediate portion that is closer to the board body.

6. The terminal includes a connection terminal, the connection member includes a plurality of the bus bars, the plurality of bus bars are arranged in parallel with each other in an extension direction of the bus bar holder; 3. The motor according to claim 2, wherein the through holes formed in the plurality of bus bars are arranged in a straight line.

7. The motor according to claim 1 , wherein the bus bar holder includes a first positioning pin for positioning the bus bar holder relative to the board body.

8. a terminal holder for holding the terminal; 2. The motor according to claim 1, wherein the bus bar holder includes a second positioning pin for positioning the bus bar holder relative to the terminal holder.

9. the substrate body has a notch portion in which one side is notched, The motor according to claim 1 , wherein the connecting member is attached to the substrate body along the notch.

10. The motor according to claim 9 , wherein at least a portion of the bus bar holder is located inside the notch, and the bus bar holder overlaps with the board body in the thickness direction of the board body.

11. A motor according to any one of claims 1 to 10; a fan that is rotationally driven by the motor to generate cooling air.

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