Motor and pump device

Abstract

To provide a motor in which a wiring terminal can be easily manufactured.SOLUTION: A wiring terminal 71 includes a substrate connection part 711 to which a substrate is connected, at least one leg part 715 that is held by a division insulator 320, a flat plate part 710 having a plate thickness direction directed to a radial direction between the leg part and the substrate connection part and extending in a linear shape along a circumferential direction, an elastic part 714 serving as a stress transmission inhibiting part connecting the plate part and the substrate connection part, and a wiring connection part 718 having a portion projected from the plate part so as to be bent to inwardly hold a wiring. The division insulator includes an outer circumferential side part 321 that overlaps an annular part extending in an annular shape on the outer circumferential side of a stator core 31, from a motor axis L direction and holds a wiring terminal. The plate part overlaps the outer circumferential side part in the motor axis L direction. The width of the plate part in the circumferential direction is smaller than the maximum width of a coil 35 which is wound around a salient pole part 312, in the circumferential direction.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a motor and a pump device in which ends of a winding extending from a coil are connected to winding terminals. [Background technology]

[0002] A motor having a stator core with multiple salient poles arranged in the circumferential direction around the motor axis, an insulator held by the stator core, and a coil wound around the salient pole via the insulator has a structure in which the end of the winding drawn from the coil is connected to a winding terminal (see Patent Document 1). In the motor described in Patent Document 1, the winding terminal has a pin-shaped board connection part to which a board is connected, multiple legs held by the insulator, a plate part facing in the radial direction between the legs and the board connection part, and a winding connection part whose part protruding from the plate part is bent to hold the winding inward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-103913 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in Patent Document 1, the plate portion is curved radially outward so that the plate portion does not overlap with the coil in the motor axial direction. This necessitates processing to bend the plate portion into a predetermined curved shape, which poses a problem that the manufacturing of the winding terminals tends to be difficult.

[0005] In view of the above problems, an object of the present invention is to provide a motor and a pump device in which the winding terminals can be easily manufactured. [Means for solving the problem]

[0006] In order to achieve the above object, a motor according to the present invention includes a stator core having a plurality of salient poles arranged in a circumferential direction around a motor axis, an insulator held by the stator core, a coil wound around the salient pole via the insulator, a winding terminal held by the insulator and connected to a winding extending from the coil, and a board connected to the winding terminal, wherein the winding terminal has a board connection portion to which the board is connected, at least one leg portion held by the insulator, and a plate thickness direction between the leg portion and the board connection portion is oriented in the radial direction and is oriented in the circumferential direction. a stress transfer suppression portion connecting the plate portion and the board connection portion, and a winding connection portion whose portion protruding from the plate portion is bent so as to hold the winding on the inside, the insulator overlaps with an annular portion extending in an annular shape on the outer periphery of the stator core in the motor axial direction along the motor axis, and has an outer periphery portion for holding the winding terminals, the plate portion overlaps with the outer periphery portion in the motor axial direction, and a circumferential width of the plate portion is narrower than a maximum circumferential width of the coil wound around the salient pole portion.

[0007] In the present invention, since the plate portion is flat and extends linearly in the circumferential direction, the winding terminal can be easily manufactured. Also, since the plate portion overlaps with the outer peripheral portion of the insulator in the motor axial direction, the flat plate portion does not protrude radially inward from the annular outer peripheral portion. This makes it possible to prevent the plate portion from interfering with the coil when winding the coil around the salient pole via the insulator.

[0008] The motor may be provided with a plurality of legs each extending along the same axis as the board connection portion in the motor axial direction, so that the winding terminals are prevented from being deformed even when stress is applied from the board to the board connection portion.

[0009] The winding connection portion may be configured not to overlap the coil in the radial direction in the motor axial direction, which can prevent the winding connection portion from interfering with the coil when the coil is wound around the salient pole via an insulator.

[0010] The stress transmission suppressing portion may be an elastic portion that is elastically deformable between the plate portion and the board connection portion. According to this embodiment, the stress between the board connection portion and the plate portion can be absorbed by the elastic portion. This makes it possible to suppress the transmission of stress from the winding terminal to the board by the elastic portion.

[0011] In the present invention, the stator core, the insulator, the coil, and the portion of the winding terminal from the leg portion to the winding connection portion may be covered with a resin sealing member. Even when such a configuration is adopted, stress due to thermal expansion of the winding terminal is absorbed by the elastic portion, so that the transmission of stress to the board can be suppressed.

[0012] In the present invention, an embodiment may be adopted in which an end portion of the plate portion on the side of the elastic portion is exposed from the resin sealing member. According to this embodiment, it is possible to prevent the elastic portion from being covered with the resin sealing member.

[0013] In the present invention, a mode can be adopted in which the winding connection portion is electrically connected to the winding by a fusing process.

[0014] The motor according to the present invention can be used in a pump device, in which case the pump device is provided with an impeller that is driven in rotation by the motor. Effect of the Invention

[0015] In the present invention, since the elastic portion is provided between the board connection portion and the leg portion of the winding terminal, the stress can be absorbed by the elastic portion, and therefore the transmission of stress from the winding terminal to the board can be suppressed by the elastic portion. [Brief description of the drawings]

[0016] [Figure 1] 1 is a perspective view showing an embodiment of a pump device and a motor to which the present invention is applied; [Diagram 2] FIG. 2 is a vertical cross-sectional view of the pump device and the motor shown in FIG. [Diagram 3] FIG. 2 is an exploded perspective view showing a state in which a cover is removed from the pump device shown in FIG. [Figure 4] 4 is an exploded perspective view showing a state in which a substrate is removed from the state shown in FIG. 3. [Diagram 5] 2 is an exploded perspective view showing a state in which a housing and a stator are separated in the motor shown in FIG. 1. [Figure 6] 6 is a perspective view of the vicinity of the winding terminal shown in FIG. 5 as viewed from the inside in the radial direction. [Figure 7] 6 is a perspective view of the winding terminal shown in FIG. 5 as viewed from the inside in the radial direction. [Figure 8] 6 is a perspective view of the common terminal and its vicinity shown in FIG. 5 as viewed from the inside in the radial direction. [Figure 9] 8 is a perspective view of a first modified example of the winding terminal shown in FIG. 7, as viewed from the inside in the radial direction. [Figure 10] 8 is a perspective view of a modified example 2 of the winding terminal shown in FIG. 7, as viewed from the inside in the radial direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, a motor and pump device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the direction of the motor axis L means the direction in which the motor axis L extends, the radial direction on the radially inner side and the radially outer side means the radial direction centered on the motor axis L, and the circumferential direction means the rotational direction centered on the motor axis L.

[0018] (Overall composition) FIG. 1 is a perspective view showing one embodiment of a pump device 1 and a motor 10 to which the present invention is applied. FIG. 2 is a vertical cross-sectional view of the pump device 1 and the motor 10 shown in FIG. 1. In FIG. 1 and FIG. 2, the pump device 1 has a case 2 having an intake port 21a and a discharge port 22a, a motor 10 arranged on one side L1 of the case 2 in the direction of the motor axis L, and an impeller 25 arranged in a pump chamber 20 inside the case 2, and the impeller 25 is driven to rotate around the motor axis L by the motor 10. The motor 10 has a cylindrical stator 3, a rotor 4 arranged inside the stator 3, a resin housing 6 that covers the stator 3, and a round bar-shaped support shaft 5 that rotatably supports the rotor 4. The support shaft 5 is made of metal or ceramic. In the pump device 1 of this embodiment, the fluid is liquid, and the pump device 1 is used under conditions where the environmental temperature and the fluid temperature are likely to change.

[0019] The case 2 constitutes a wall surface 23 on the other side L2 of the pump chamber 20 in the direction of the motor axis L, and a side wall 29 extending in the circumferential direction. The case 2 includes a suction pipe 21 extending along the motor axis L and a discharge pipe 22 extending in a direction perpendicular to the motor axis L. The suction pipe 21 and the discharge pipe 22 each include a suction port 21a and a discharge port 22a at their ends. The suction pipe 21 is provided concentrically with the motor axis L.

[0020] In the motor 10, the stator 3 has a stator core 31, insulators 32, 33 held by the stator core 31, and a coil 35 wound around the stator core 31 with the insulators 32, 33 interposed therebetween.

[0021] The rotor 4 has a cylindrical portion 40 that extends from a position facing the stator 3 on the radial inside toward the pump chamber 20 along the motor axis L, and the cylindrical portion 40 opens at the pump chamber 20. A cylindrical magnet 47 is held on the outer circumferential surface of the cylindrical portion 40 so as to face the stator 3 on the radial inside. The magnet 47 is, for example, a neodymium bonded magnet.

[0022] In the rotor 4, a disk-shaped flange portion 45 is formed at the end of the cylindrical portion 40 on the other side L2 in the motor axis L direction, and the disk 26 is connected to the flange portion 45 from the other side L2 in the motor axis L direction. A central hole 260 is formed in the center of the disk 26. A plurality of blade portions 261 are formed at equal angular intervals on the surface of the disk 26 facing the flange portion 45, and extend radially outward while curving in an arc from the periphery of the central hole 260, and the disk 26 is fixed to the flange portion 45 via the blade portions 261. Therefore, the flange portion 45 and the disk 26 form an impeller 25 connected to the cylindrical portion 40 of the rotor 4. In this embodiment, the disk 26 is inclined so that the radially outer side is located closer to the flange portion 45 than the radially inner side.

[0023] In the rotor 4, a cylindrical radial bearing 11 is held on the radial inside of the cylindrical portion 40 by a method such as crimping, and the rotor 4 is rotatably supported by the support shaft 5 via the radial bearing 11. A first end 51 on one side L1 of the support shaft 5 in the motor axis L direction is held in an axial hole 65 formed in a bottom wall 63 of the housing 6. A receiving portion 280 is formed in the case 2, which faces the second end 52 of the support shaft 5 on the pump chamber 20 side on the side of the pump chamber 20 and limits the movable range of the support shaft 5 toward the pump chamber 20 side. The case 2 is provided with three support portions 27 extending from the inner peripheral surface of the suction pipe 21 to the motor 10 side. A tubular portion 28 is formed at the end of the support portion 27, with the support shaft 5 located inside, and the receiving portion 280 is formed by the bottom of the tubular portion 28 on the other side L2 in the motor axis L direction. A circular thrust bearing 28 is formed at the second end 52 of the support shaft 5. The thrust bearing 12 is mounted on the support shaft 5, and is disposed between the radial bearing 11 and the cylindrical portion 28. Here, the first end 51 and the shaft hole 65 are at least partially formed to have a D-shaped cross section, and the second end 52 of the support shaft 5 and the hole of the thrust bearing 12 are also formed to have a D-shaped cross section. Therefore, the support shaft 5 and the thrust bearing 12 are prevented from rotating.

[0024] The housing 6 is a partition member having a first partition portion 61 facing the wall surface 23 of the pump chamber 20, and a second partition portion 62 interposed between the stator 3 and the magnet 47. The housing 6 also has a cylindrical body portion 66 that covers the stator 3 from the outside in the radial direction. Therefore, the housing 6 is a resin sealing member 60 that covers the stator 3 from both sides in the radial direction and both sides in the direction of the motor axis L, and is made of polyphenylene sulfide (PPS). This is the resin portion formed when the stator 3 is insert-molded using a material such as sulfide.

[0025] (Detailed configuration of motor 10) Fig. 3 is an exploded perspective view showing a state in which the cover 18 is removed from the pump device 1 shown in Fig. 1. Fig. 4 is an exploded perspective view showing a state in which the substrate 19 is removed from the state shown in Fig. 3. Fig. 5 is an exploded perspective view showing a state in which the housing 6 and the stator 3 are separated in the motor 10 shown in Fig. 1. Note that Figs. 3, 4, and 5 are inverted in the direction of the motor axis L compared to Figs. 1 and 2, and one side L1 of the direction of the motor axis L is the upper side of the drawings.

[0026] As shown in Figures 2, 3, and 4, a cover 18 is fixed to an end portion 64 on one side L1 of the housing 6 in the direction of the motor axis L, and a board 19 on which a circuit for controlling the power supply to the coil 35 and the like are provided is arranged between the cover 18 and the bottom wall 63 of the housing 6.

[0027] The substrate 19 is fixed to the housing 6 by a first fixing portion 97 using a first screw 91 and a second fixing portion 98 using a second screw 92. The housing 6 is formed with a first cylindrical portion 67 protruding from the bottom wall 63 toward one side L1 in the direction of the motor axis L, and the first fixing portion 97 is configured by fastening the first screw 91, which is a tapping screw, to the first cylindrical portion 67 through a notch 197 formed in the edge of the substrate 19. The housing 6 is also formed with a second cylindrical portion 68 protruding from the bottom wall 63 toward one side L1 in the direction of the motor axis L on the opposite side of the motor axis L, and the second fixing portion 98 is configured by fastening the second screw 92, which is a tapping screw, to the second cylindrical portion 68 through a notch 198 formed in the edge of the substrate 19.

[0028] The substrate 19 is provided with a plurality of first connection portions 191 to which metal winding terminals 71 protruding from the stator 3 through the bottom wall 63 of the housing 6 to one side L1 in the direction of the motor axis L are connected by solder, and a second connection portion 192 to which a metal connector terminal 75 held in the housing 6 is connected by solder. The substrate 19 is provided with wiring and the like that electrically connects the second connection portions 192 and the first connection portions 191 via a drive circuit and the like mounted on the substrate 19.

[0029] A cylindrical connector housing 69 is formed in the housing 6, and an end of a connector terminal 75 is located inside the connector housing 69. Therefore, when a connector is connected to the connector housing 69 and a signal or the like is supplied, the signal is input to the drive circuit via the connector terminal 75 and the second connection portion 192, and as a result, a drive current generated in the drive circuit is supplied to each coil 35 via the first connection portion 191 and the winding terminal 71. As a result, the rotor 4 rotates around the motor axis L. This causes the impeller 25 to rotate in the pump chamber 20, and the inside of the pump chamber 20 becomes negative pressure, so that the fluid is sucked into the pump chamber 20 from the suction pipe 21 and discharged from the discharge pipe 22.

[0030] As shown in FIG. 2 and FIG. 5, in the stator 3, the stator core 31 includes an annular portion 311 extending in an annular shape and a plurality of salient poles 312 protruding radially inward from the annular portion 311. The salient poles 312 are arranged at a constant pitch in the circumferential direction. The stator core 31 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. The outer circumferential surface of the annular portion 311 is formed with recesses 315 extending in the direction of the motor axis L corresponding to the plurality of salient poles 312. In this embodiment, the stator core 31 is formed by bending a linearly extending member into an annular shape and then welding the ends of the annular portion 311 together. Therefore, the stator core 31 includes a welded portion 310 that connects the portions extending in the circumferential direction to each other at one circumferential location of the annular portion 311.

[0031] The insulators 32, 33 overlap the stator core 31 from both sides in the direction of the motor axis L, and cover each of the multiple salient poles 312. In this embodiment, the insulators 32, 33 are composed of multiple split insulators 320, 330 split corresponding to each of the multiple salient poles 312. Each of the multiple split insulators 320, 330 includes an outer circumferential portion 321, 331 overlapping the annular portion 311 of the stator core 31 from the direction of the motor axis L, an inner circumferential portion 322, 332 protruding in the direction of the motor axis L at an end on the radially inner side of the salient pole 312, and a cylindrical portion forming portion (not shown) connecting the outer circumferential portion 321, 331 and the inner circumferential portion 322, 332, and the coil 35 is wound around the salient pole 312 via the cylindrical portion forming portion.

[0032] The motor 10 is a three-phase motor. The coils 35 are arranged in the order of a first-phase coil 35(U) consisting of a U-phase coil, a second-phase coil 35(V) consisting of a V-phase coil, and a third-phase coil 35(W) consisting of a W-phase coil. In this embodiment, three of each of the first-phase coils 35(U), second-phase coils 35(V), and third-phase coils 35(W) are arranged, and the total number of coils 35 is nine. Thus, a total of nine split insulators 320 are arranged, and the nine split insulators 320 have the same configuration.

[0033] In this embodiment, guide grooves 335 for the winding 350 when winding the coil 35 are formed on the outer surfaces of the outer peripheral portions 321 of the nine split insulators 330, and the first-phase coil 35(U) is composed of a single winding. Therefore, the three first-phase coils 35(U) are electrically connected in series. The same is true for the second-phase coils 35(V) and the third-phase coils 35(W).

[0034] Among the nine split insulators 320, a winding terminal 71 is held on an outer circumferential portion 321 of the split insulator 320 corresponding to one of the first-phase coils 35(U), the split insulator 320 corresponding to one of the second-phase coils 35(V), and the split insulator 320 corresponding to one of the third-phase coils 35(W). One end 351 of a winding 350 constituting three coils 35 connected in series is connected to each of the three winding terminals 71, and the other end 352 is electrically connected to a metallic common terminal 72 held on an outer circumferential portion 321 of another split insulator 320. In this embodiment, the other end 352 is a winding start end, and the one end 351 is a winding end.

[0035] The winding terminal 71 protrudes from the split insulator 320 toward one side L1 in the direction of the motor axis L, and a board connection portion 711, which is the tip of the winding terminal 71, is connected to the board 19 shown in Figures 2, 3, and 4.

[0036] (Configuration of winding terminal 71) Fig. 6 is a perspective view of the vicinity of the winding terminal 71 shown in Fig. 5 as seen from the inside in the radial direction. Fig. 7 is a perspective view of the winding terminal 71 shown in Fig. 5 as seen from the inside in the radial direction. 3 and the like, one side L1 in the direction of the motor axis L is defined as the upper side.

[0037] As shown in FIG. 5, among the split insulators 320 that do not have a common terminal 72, three split insulators 320 corresponding to different phases hold a winding terminal 71 to which a winding end 351 of a winding 350 extending from a coil 35 is connected.

[0038] As shown in Figs. 6 and 7, the winding terminal 71 has a board connection portion 711, a plurality of legs 715 held by the split insulator 320, a plate portion 710 with the plate thickness direction facing the radial direction between the legs 715 and the board connection portion 711, and a winding connection portion 718 whose portion protruding from the plate portion 710 is bent so as to hold the winding 350 on the inside. The winding connection portion 718 has a portion protruding from an end portion 710a of the plate portion 710 on the leg 715 side bent upward to hold the winding 350 on the inside. Therefore, the winding connection portion 718 holds the end portion 351 of the winding 350 by the fusing process and is electrically connected to the end portion 351 of the winding 350. The fusing process is a thermal crimping process that connects the winding 350 and the winding connection portion 718 by utilizing electrical resistance.

[0039] In this embodiment, the winding terminal 71 has an elastic portion 714 that is elastically deformable between the plate portion 710 and the board connection portion 711. Here, as shown in FIG. 4, the stator core 31, the insulator 32, the coil 35, and the portion from the leg portion 715 to the winding connection portion 718 of the winding terminal 71 are covered with the resin sealing member 60, but the board connection portion 711 and the elastic portion 714 protrude from the bottom wall 63 of the resin sealing member 60 to one side L1 in the motor axis L direction and are exposed. More specifically, most of the plate portion 710 is covered with the resin sealing member 60, but the end portion 710b of the plate portion 710 on the elastic portion 714 side is exposed from the bottom wall 63 of the resin sealing member 60. Therefore, the board connection portion 711 and the elastic portion 714 protrude from the bottom wall 63 of the resin sealing member 60 to one side L1 in the motor axis L direction and are exposed.

[0040] In this embodiment, of the two legs 715, one leg 715 is a first leg 716, and the other leg 715 is a second leg 717 provided on the other circumferential side CCW from the first leg 716. Corresponding to this configuration, the split insulator 320 is provided with a first hole 326 into which the first leg 716 fits, and a second hole 327 into which the second leg 717 fits, on the other circumferential side CCW from the first leg 726.

[0041] In this embodiment, the first hole 326 is a press-fit hole into which the first leg portion 716 fits, and the second hole 327 is a guide hole into which the second leg portion 717 fits. Here, both of the two leg portions 715 are square rod-shaped with a rectangular cross section and have the same thickness. However, the first hole 326 is a round hole with a circular cross section, and the second hole 327 is a square hole with a rectangular cross section. Therefore, the second hole 327 can form a guide hole, and the first hole 326 can form a press-fit hole. The first hole 326 opens at the bottom of a recess 329 formed by cutting out the surface of the split insulator 320 on one side L1 in the motor axis L direction and the radially inner surface.

[0042] In this embodiment, the elastic portion 714 is a meandering portion 712 that meanders so as to be folded back in the circumferential direction between the plate portion 710 and the board connection portion 711. Here, the elastic portion 714 extends from an end portion 710c on the other circumferential side CCW of the plate portion 710 toward the board connection portion 711, and the meandering portion 712 does not overlap with the first leg portion 716 used for press-fitting when viewed from the motor axis line L direction. Therefore, when the end portion 710a of the plate portion 710 opposite to the split insulator 320 is pressed to press the first leg portion 716 into the first hole 326, the meandering portion 712 is unlikely to get in the way. Moreover, the elastic portion 714 meanders within a range that overlaps with the plate portion 710 in the circumferential direction when viewed from the motor axis line L direction, and does not protrude from the plate portion 710 in the circumferential direction. Therefore, the circumferential dimension of the winding terminal 71 can be shortened.

[0043] In this manner, in this embodiment, since the elastic portion 714 is provided between the board connection portion 711 and the leg portion 715 of the winding terminal 71, the stress can be absorbed by the elastic portion 714. Therefore, the elastic portion 714 can suppress the transmission of stress from the winding terminal 71 to the board 19. For example, when the board connection portion 711 is inserted into a hole in the board 19 and the board connection portion 711 and the land of the board 19 are connected by soldering, it is possible to suppress the circuit from being damaged due to the application of stress to the board 19. Furthermore, even if the heat generated in the coil 35 is transmitted to the winding terminal 71 when the motor 10 is driven and the winding terminal 71 thermally expands, it is possible to suppress the board 19 from bending and the circuit from being damaged. Furthermore, when the stator 3 is sealed with resin, a part of the winding terminal 71 is also sealed with resin, so that it is possible to suppress the board 19 from bending and the circuit from being damaged even when the winding terminal 71 thermally expands due to the heat during the resin sealing.

[0044] (Configuration of common terminal 72) Fig. 8 is a perspective view of the vicinity of the common terminal 72 shown in Fig. 5 as seen from the inside in the radial direction. Note that, in Fig. 8, as in Fig. 3 and the like, one side L1 in the direction of the motor axis L is the upper side.

[0045] As shown in FIG. 5, one of the split insulators 320 (W) that does not have a winding terminal 71 holds a common terminal 72 to which the winding start ends 352 of the windings 350 extending from each of the multiple phase coils 35 are connected.

[0046] In this embodiment, the common terminal 72 includes a plate portion 720 extending in the circumferential direction, a plurality of winding connection portions 721 each protruding from a plurality of circumferential positions of the plate portion 720 and bent so as to hold an end portion 352 of the winding 350 on the inside, and a leg portion 725 protruding from the plate portion 720 toward the split insulator 320 between adjacent winding connection portions 721 among the plurality of winding connection portions 721, and the leg portion 725 is held by the split insulator 320. The leg portion 725 is provided only between adjacent winding connection portions 721 among the plurality of winding connection portions 721. Therefore, since the number of the legs 725 is small, the dimension of the plate portion 720 in the circumferential direction is short. Therefore, the plate portion 720 is formed in a flat plate shape extending linearly along the circumferential direction.

[0047] In addition, the multiple winding connection portions 721 are bent so as to hold the ends 352 of the windings 350 inward, and the winding connection portions 721 hold the ends 352 of the windings 350 by fusing processing and are electrically connected to the ends 352 of the windings 350.

[0048] In this embodiment, since the number of phases is three, there are three winding connection portions 721 and two legs 725. Of the two legs 725, one leg 725 is a first leg 726, and the other leg 725 is a second leg 727 provided on the other circumferential side CCW from the first leg 726. In response to this configuration, the split insulator 320 is provided with a first hole 326 into which the first leg 726 fits, and a second hole 327 into which the second leg 727 fits, on the other circumferential side CCW from the first leg 726, similar to the split insulator 320 that holds the winding terminal 71.

[0049] In this embodiment, the first hole 326 is a press-fit hole into which the first leg portion 726 fits, and the second hole 327 is a guide hole into which the second leg portion 727 fits. Here, both of the two leg portions 725 are square rod-shaped with a rectangular cross section and have the same thickness. However, the first hole 326 is a round hole with a circular cross section, and the second hole 327 is a square hole with a rectangular cross section. Therefore, the second hole 327 can form a guide hole, and the first hole 326 can form a press-fit hole.

[0050] The three winding connection parts 721 are a first winding connection part 721(U), a second winding connection part 721(V) provided on the other circumferential side CCW of the first winding connection part 721(U), and The winding 350 includes a third winding connection portion 721(W) provided between the winding connection portion 721(U) and the second winding connection portion 721(V). An end 352 of the winding 350 extending from the first-phase coil 35(U) reaches the first winding connection portion 721(U) from one circumferential side CW. An end 352 of the winding 350 extending from the second-phase coil 35(V) reaches the second winding connection portion 721(V) from the other circumferential side CCW. An end 352 of the winding 350 extending from the third-phase coil 35(W) reaches the third winding connection portion 721(W) from one circumferential side CW. Here, the split insulator 320 is provided, between the first winding connection portion 721(U) and the third winding connection portion 721(W), with a guide recess 329 for guiding the end 352 of the winding 350 extending from the third-phase coil 35(W) from the radially inner side to the third winding connection portion 721(W). Therefore, even if the end 352 of the winding 350 extending from the first-phase coil 35(U) and the end 352 of the winding 350 extending from the third-phase coil 35(W) both arrive from one circumferential side CW, the end 352 of the winding 350 extending from the third-phase coil 35(W) can be guided to the third winding connection portion 721(W) through the guide recess 329, facilitating connection to the common terminal 72.

[0051] As described above, in the motor 10 and the pump device 1 of this embodiment, the common terminal 72 has one leg 725 between each adjacent winding connection portion 721. Furthermore, the leg 725 is provided only between adjacent winding connection portions 721 among the plurality of winding connection portions 721, and no leg 725 is provided at both ends of the plate portion 720. Therefore, the circumferential dimension of the common terminal 72 is short, and the cost of the common terminal 72 can be reduced. Furthermore, since the number of the legs 725 is small, the common terminal 72 can be easily attached to the insulator 32.

[0052] In addition, since the circumferential dimension of the common terminal 72 is short, a structure in which the common terminal 72 is held by one split insulator 320 can be realized. This allows high relative positional accuracy of the first hole 326 and the second hole 327 into which the leg portion 725 fits. This makes it easy to attach the common terminal 72. In addition, since the circumferential dimension of the common terminal 72 is short, the plate portion 720 of the common terminal 72 can be flat, and a process of bending the plate portion 720 is not required. This allows the cost of the common terminal 72 to be reduced.

[0053] In the insulator 32, the first hole 326 is a press-fit hole into which the first leg portion 726 fits, and the second hole 327 is a guide hole into which the second leg portion 727 fits. Therefore, the first leg portion 726 can be press-fitted into the first hole 326 while being guided by the second leg portion 727 and the second hole 327. Therefore, it is easier to attach the common terminal 72 to the insulator 32 than when both of the two legs are press-fitted.

[0054] (Modification 1 of Winding Terminal 71) Fig. 9 is a perspective view of Modification 1 of the winding terminal 71 shown in Fig. 7, seen from the inside in the radial direction. Note that the basic configuration of this embodiment is similar to that of the above embodiment, so the same reference numerals are used for common parts and their description will be omitted.

[0055] In the winding terminal 71 described with reference to Fig. 7 etc., the first leg 716 and the second leg 717 have the same length, but in this embodiment, as shown in Fig. 9, the second leg 717 for guiding is longer than the first leg 716 for press-fitting. Therefore, when the first leg 716 is press-fitted into the first hole 326 while the winding terminal 71 is guided by the second leg 717 and the second hole 327, it is easy to guide the common terminal 72.

[0056] (Modification 2 of Winding Terminal 71) Fig. 10 is a perspective view of the second modified example of the winding terminal 71 shown in Fig. 7, seen from the inside in the radial direction. Note that the basic configuration of this embodiment is similar to that of the above embodiment, and therefore the same parts are used in common. The following symbols are used and their explanations are omitted.

[0057] In the winding terminal 71 described with reference to Fig. 7 etc., the elastic portion 714 is the meandering portion 712, but in this embodiment, as shown in Fig. 10, the elastic portion 714 is a pin-shaped shaft portion 713 that extends linearly toward the board connection portion 711 with a length dimension longer than that of the first leg portion 716. For example, the shaft portion 713 constituting the elastic portion 714 has a length 1.2 to 1.5 times that of the first leg portion 716. Therefore, the elastic portion 714 has appropriate elasticity.

[0058] Here, the elastic portion 714 extends from the end portion 710c on the other circumferential side CCW of the plate portion 710 toward the board connection portion 711, and the elastic portion 714 does not overlap with the first leg portion 716 used for press-fitting when viewed from the direction of the motor axis L. For this reason, when the end portion 710a of the plate portion 710 opposite the split insulator 320 is pressed to press the first leg portion 716 into the first hole 326, the elastic portion 714 is unlikely to get in the way.

[0059] [Other embodiments] In the above embodiment, the motor 10 used in the pump device 1 has been illustrated, but the present invention may also be applied to motors mounted on other devices. [Explanation of symbols]

[0060] REFERENCE SIGNS LIST 1...pump device, 2...case, 3...stator, 4...rotor, 6...housing, 10...motor, 31...stator core, 32, 33...insulator, 35...coil, 35(U)...first phase coil, 35(V)...second phase coil, 35(W)...third phase coil, 60...resin sealing member, 61...first partition wall portion, 62...second partition wall portion, 63...bottom wall, 66...body portion, 67...first cylindrical portion, 68...second cylindrical portion, 69...connector housing, 71...winding terminal, 72...common terminal, 75...connector terminal, 97...first fixed portion, 98...second fixed portion, 191... First connection portion, 192...second connection portion, 311...annular portion, 312...salient pole, 320, 330...split insulator, 321, 331...outer periphery portion, 322, 332...inner periphery portion, 326...first hole, 327...second hole, 350...winding, 710, 720...plate portion, 711...substrate connection portion, 712...meandering portion, 713...shaft portion, 714...elastic portion, 715, 725...leg portion, 716, 726...first leg portion, 717, 727...second leg portion, 721...winding connection portion, 721(U)...first winding connection portion, 721(V)...second winding connection portion, 721(W)...third winding connection portion

Claims

1. a stator core having a plurality of salient poles arranged in a circumferential direction around a motor axis; an insulator held by the stator core; a coil wound around the salient pole via the insulator; a winding terminal that is held by the insulator and to which a winding extending from the coil is connected; A substrate connected to the winding terminals; having the winding terminal has a board connection portion to which the board is connected, at least one leg portion held by the insulator, a flat plate portion whose plate thickness direction is oriented in the radial direction between the leg portion and the board connection portion and which extends linearly along the circumferential direction, a stress transmission suppression portion connecting the plate portion and the board connection portion, and a winding connection portion whose portion protruding from the plate portion is bent so as to hold the winding on the inside, the insulator includes an outer circumferential portion that overlaps an annular portion extending in an outer circumferential direction of the stator core in a motor axial direction along the motor axis and that holds the winding terminals, the plate portion overlaps with the outer circumferential portion in the motor axial direction, The motor is characterized in that the circumferential width of the plate portion is narrower than the maximum circumferential width of the coil wound around the salient pole portion.

2. 2. The motor according to claim 1, A motor, characterized in that at least a portion of the leg portion extends on the same axis as the board connection portion in the motor axial direction.

3. 3. The motor according to claim 1, The motor, wherein the winding connection portion does not radially overlap the coil in the motor axial direction.

4. The motor according to any one of claims 1 to 3, The motor is characterized in that the stress transmission suppression portion is an elastic portion that is elastically deformable between the plate portion and the board connection portion.

5. The motor according to any one of claims 1 to 4, the stator core, the insulator, the coil, and the portion of the winding terminal from the leg portion to the winding connection portion are covered with a resin sealing member.

6. 6. The motor according to claim 5, The motor is characterized in that the end of the plate portion on the elastic portion side is exposed from the resin sealing member.

7. A motor according to any one of claims 1 to 6, A motor characterized in that the winding connection portion is electrically connected to the winding by a fusing process.

8. A pump device comprising the motor according to any one of claims 1 to 7, A pump device comprising an impeller that is rotationally driven by the motor.

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