Motors and pumps

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 the 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 circumferentially around the motor axis, an insulator held by the stator core, and a coil wound around the salient poles via the insulator, employs 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 portion to which a board is connected, multiple legs held by the insulator, a plate portion facing radially between the legs and the board connection portion, and a winding connection portion whose portion protruding from the plate portion is bent to hold the winding inside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-103913 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 as not to overlap the coil in the motor axial direction, which necessitates processing to bend the plate portion into a predetermined curved shape, which can make manufacturing the winding terminals 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 solve the above problems, 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 substrate connected to the winding terminal, wherein the winding terminal has a substrate connection part to which the substrate is connected, at least one leg part held by the insulator, and a plate thickness direction between the leg part and the substrate connection part is oriented in a radial direction and is oriented in a 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 inside, wherein the insulator overlaps with the 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 includes an outer periphery portion for holding the winding terminals, the plate portion overlaps with the outer periphery portion in the motor axial direction, and the circumferential width of the plate portion is narrower than the maximum circumferential width of the coil wound around the salient pole portion.

[0007] In the present invention, the plate portion has a flat shape that extends linearly in the circumferential direction, which facilitates manufacturing of the winding terminal. Furthermore, because the plate portion overlaps 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 prevents the plate portion from interfering with the coil when winding the coil around the salient pole via the insulator.

[0008] At least a portion of the leg portion may extend on the same axis as the board connection portion in the motor axial direction, which can prevent deformation of the winding terminal 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 aspect, the elastic portion can absorb stress between the board connection portion and the plate portion. This allows the elastic portion to suppress the transmission of stress from the winding terminal to the board.

[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 can be covered with a resin sealing member. Even when such an embodiment is adopted, stress due to thermal expansion of the winding terminal is absorbed by the elastic portion, so that transmission of stress to the board can be suppressed.

[0012] In the present invention, an aspect may be adopted in which the end of the plate portion on the elastic portion side is exposed from the resin sealing member, which makes it 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 fusing.

[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 rotationally driven by the motor. [Effects of the Invention]

[0015] In the present invention, the elastic portion is provided between the board connection portion and the leg portion of the winding terminal, so that the stress can be absorbed by the elastic portion, thereby suppressing the transmission of stress from the winding terminal to the board. [Brief explanation 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; [Figure 2] FIG. 2 is a longitudinal cross-sectional view of the pump device and motor shown in FIG. 1. [Figure 3] FIG. 2 is an exploded perspective view showing the pump device shown in FIG. 1 with a cover removed. [Figure 4] FIG. 4 is an exploded perspective view showing a state in which the substrate is removed from the state shown in FIG. 3. [Figure 5] 2 is an exploded perspective view showing the motor shown in FIG. 1 with the housing and the stator separated. FIG. [Figure 6] 6 is a perspective view of the vicinity of the winding terminal shown in FIG. 5 as seen from the inside in the radial direction. [Figure 7] 6 is a perspective view of the winding terminal shown in FIG. 5 as seen 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, seen 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, 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, viewed from the inside in the radial direction. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a motor and a 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 refers to the direction in which the motor axis L extends, the radial direction in the radially inner and radially outer directions refers to the radial direction centered on the motor axis L, and the circumferential direction refers to 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 longitudinal cross-sectional view of the pump device 1 and the motor 10 shown in FIG. 1. In FIGS. 1 and 2, the pump device 1 includes a case 2 having an intake port 21a and an exhaust port 22a, a motor 10 disposed on one side L1 of the case 2 along the motor axis L, and an impeller 25 disposed in a pump chamber 20 inside the case 2. The impeller 25 is driven to rotate about the motor axis L by the motor 10. The motor 10 includes a cylindrical stator 3, a rotor 4 disposed inside the stator 3, a resin housing 6 that covers the stator 3, and a round rod-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 a liquid, and the pump device 1 is used under conditions where the ambient temperature and the fluid temperature are prone to change.

[0019] The case 2 forms 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, with the suction pipe 21 and the discharge pipe 22 each having a suction port 21a and a discharge port 22a at their ends. The suction pipe 21 is disposed concentrically with the motor axis L.

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

[0021] The rotor 4 has a cylindrical portion 40 that extends from a position facing the stator 3 on the inside in the radial direction toward the pump chamber 20 along the motor axis L, and the cylindrical portion 40 is open to 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 inside in the radial direction. The magnet 47 is, for example, a neodymium bonded magnet.

[0022] In the rotor 4, a disk-shaped flange portion 45 is formed at an end portion of the cylindrical portion 40 on the other side L2 in the direction of the motor axis L, and a disk 26 is connected to the flange portion 45 from the other side L2 in the direction of the motor axis L. 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. 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 by caulking or the like on the radial inside of the cylindrical portion 40, and the rotor 4 is rotatably supported on the support shaft 5 via the radial bearing 11. A first end 51 on one side L1 of the support shaft 5 in the direction of the motor axis L is held in a shaft hole 65 formed in the bottom wall 63 of the housing 6. A receiving portion 280 is formed in the case 2, facing the second end 52 of the support shaft 5 on the pump chamber 20 side, on the side of the pump chamber 20, to limit the movable range of the support shaft 5 toward the pump chamber 20. The case 2 is provided with three support portions 27 extending from the inner peripheral surface of the suction pipe 21 toward the motor 10. A tubular portion 28 is formed at the end of the support portion 27, inside which the support shaft 5 is located, and the receiving portion 280 is formed by the bottom of the tubular portion 28 on the other side L2 in the direction of the motor axis L. A circular thrust bearing is formed at the second end 52 of the support shaft 5. The support shaft 5 has a thrust bearing 12 mounted thereon, and the thrust bearing 12 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 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 the pump device 1 shown in Fig. 1 with the cover 18 removed. Fig. 4 is an exploded perspective view showing the state where the substrate 19 has been removed from the state shown in Fig. 3. Fig. 5 is an exploded perspective view showing the motor 10 shown in Fig. 1 with the housing 6 and the stator 3 separated. Note that Figs. 3, 4, and 5 are inverted with respect to Figs. 1 and 2 with the direction of the motor axis L being the top side in the drawings, with one side L1 of the direction of the motor axis L being the upper side.

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

[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 formed 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 formed 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 that penetrate the bottom wall 63 of the housing 6 from the stator 3 and protrude to one side L1 in the direction of the motor axis L are connected by solder, and second connection portions 192 to which metal connector terminals 75 held in the housing 6 are 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 within the pump chamber 20, creating a negative pressure inside the pump chamber 20. Therefore, fluid is sucked into the pump chamber 20 through the suction pipe 21 and discharged from the discharge pipe 22.

[0030] As shown in FIGS. 2 and 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 weld 310 at one circumferential location of the annular portion 311 to connect the circumferentially extending portions together.

[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 made up of multiple split insulators 320, 330 that are split to correspond to each of the multiple salient poles 312. Each of the multiple split insulators 320, 330 includes an outer peripheral portion 321, 331 that overlaps the annular portion 311 of the stator core 31 in the direction of the motor axis L, an inner peripheral portion 322, 332 that protrudes in the direction of the motor axis L at the radially inner end of the salient pole 312, and a cylindrical portion-forming portion (not shown) that connects the outer peripheral portion 321, 331 and the inner peripheral 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 multiple coils 35 are arranged in this order: 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, for a total of nine coils 35. Therefore, 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 wire 350 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 wire. Therefore, the three first-phase coils 35(U) are electrically connected in series. The same is true for the second-phase coil 35(V) and the third-phase coil 35(W).

[0034] Furthermore, among the nine split insulators 320, a winding terminal 71 is held on the outer peripheral 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 the winding 350 constituting the 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 the outer peripheral portion 321 of another split insulator 320. In this embodiment, the other end 352 is the winding start end, and the one end 351 is the 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 the 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) 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. Note that FIGS. 6 and 7 also 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 Figure 5, among the split insulators 320 that do not have a common terminal 72, three split insulators 320 that correspond to different phases hold winding terminals 71 to which the winding end portions 351 of the windings 350 extending from the coil 35 are connected.

[0038] 6 and 7 , the winding terminal 71 has a board connection portion 711, multiple leg portions 715 held by the split insulator 320, a plate portion 710 whose thickness direction is oriented radially between the leg portions 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 inside. The portion of the winding connection portion 718 protruding from the end portion 710a of the plate portion 710 on the leg portion 715 side is bent upward to hold the winding 350 inside. Therefore, the winding connection portion 718 holds the end portion 351 of the winding 350 and is electrically connected to the end portion 351 of the winding 350 by a fusing process. The fusing process is a thermal crimping process that connects the winding 350 and the winding connection portion 718 using 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 of the winding terminal 71 from the leg portion 715 to the winding connection portion 718 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 direction of the motor axis L and are exposed. More specifically, most of the plate portion 710 is covered with the resin sealing member 60, but an end 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 direction of the motor axis L and are exposed.

[0040] In this embodiment, of the two leg portions 715, one leg portion 715 is a first leg portion 716, and the other leg portion 715 is a second leg portion 717 provided on the other circumferential side CCW relative to the first leg portion 716. Corresponding to this configuration, the split insulator 320 is provided with a first hole 326 into which the first leg portion 716 fits, and a second hole 327 into which the second leg portion 717 fits, on the other circumferential side CCW relative to the first leg portion 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 rectangular rod-shaped with a square cross section and are the same thickness. However, the first hole 326 is a round hole with a circular cross section, and the second hole 327 is a rectangular hole with a square 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 direction of the motor axis L and on the radially inner surface.

[0042] In this embodiment, the elastic portion 714 is a serpentine portion 712 that serpentines between the plate portion 710 and the board connecting portion 711, folding back and forth in the circumferential direction. The elastic portion 714 extends from an end portion 710c on the other circumferential side CCW of the plate portion 710 toward the board connecting portion 711, and the serpentine portion 712 does not overlap with the first leg portion 716 used for press-fitting when viewed from the direction of the motor axis L. Therefore, when the end portion 710a of the plate portion 710 opposite the split insulator 320 is pressed to press-fit the first leg portion 716 into the first hole 326, the serpentine portion 712 is unlikely to get in the way. Furthermore, when viewed from the direction of the motor axis L, the elastic portion 714 serpentines within a range that overlaps with the plate portion 710 in the circumferential 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] As described above, in this embodiment, the elastic portion 714 is provided between the board connection portion 711 and the leg portion 715 of the winding terminal 71, and therefore, 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 is connected to a land on the board 19 with solder, stress applied to the board 19 and circuit damage can be suppressed. Furthermore, even if heat generated in the coil 35 is transferred to the winding terminal 71 and the winding terminal 71 thermally expands when the motor 10 is driven, bending of the board 19 and circuit damage can be suppressed. Furthermore, when the stator 3 is resin-sealed, part of the winding terminal 71 is also resin-sealed, and therefore, even if the winding terminal 71 thermally expands due to the heat generated during resin-sealing, bending of the board 19 and circuit damage can be suppressed.

[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 etc., one side L1 in the direction of the motor axis L is the upper side.

[0045] As shown in Figure 5, one of the split insulators 320 that does not have a winding terminal 71, 320(W), holds a common terminal 72 to which the winding start ends 352 of the windings 350, the number of which corresponds to the number of phases 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 protruding from multiple circumferential locations of the plate portion 720 and bent so as to hold the end portion 352 of the winding 350 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 multiple 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 multiple winding connection portions 721. Therefore, since the number of legs 725 is small, the circumferential dimension of the plate portion 720 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 relative to the first leg 726. Corresponding 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 relative to the first leg 726, similar to the split insulator 320 that holds the winding terminal 71.

[0049] In this embodiment, first hole 326 is a press-fit hole into which first leg portion 726 fits, and second hole 327 is a guide hole into which second leg portion 727 fits. Here, both of two leg portions 725 are square rod-shaped with a rectangular cross section and have the same thickness. However, first hole 326 is a round hole with a circular cross section, and second hole 327 is a rectangular hole with a rectangular cross section. Therefore, second hole 327 can form a guide hole, and 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 side CCW in the circumferential direction with respect to the first winding connection part 721(U), and a second winding connection part 721(V) provided on the other side CCW in the circumferential direction with respect to the first winding connection part 721(U). 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 portion 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 portion 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 portion 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 with a guide recess 329 between the first winding connection portion 721(U) and the third winding connection portion 721(W), for guiding the end portion 352 of the winding 350 extending from the third-phase coil 35(W) to the third winding connection portion 721(W) from the radially inner side. Therefore, even if the end portion 352 of the winding 350 extending from the first-phase coil 35(U) and the end portion 352 of the winding 350 extending from the third-phase coil 35(W) both arrive from one circumferential side CW, the end portion 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 pump device 1 of this embodiment, the common terminal 72 is provided with one leg 725 between each pair of adjacent winding connection portions 721. Furthermore, the leg portions 725 are provided only between adjacent winding connection portions 721 among the plurality of winding connection portions 721, and no leg portions 725 are provided on either end of the plate portion 720. Therefore, the circumferential dimension of the common terminal 72 is short, which allows for a reduction in the cost of the common terminal 72. Furthermore, the small number of legs 725 makes it easy to attach the common terminal 72 to the insulator 32.

[0052] Furthermore, because the circumferential dimension of the common terminal 72 is short, it is possible to realize a structure in which the common terminal 72 is held by a single split insulator 320. This allows for 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. Furthermore, because the circumferential dimension of the common terminal 72 is short, the plate portion 720 of the common terminal 72 can be flat, eliminating the need for a process for bending the plate portion 720. This allows for a reduction in the cost of the common terminal 72.

[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. This makes it 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, viewed 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 reference numerals are used to designate 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, guiding the common terminal 72 is easy.

[0056] (Modification 2 of winding terminal 71) Fig. 10 is a perspective view of Modification 2 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 the same as that of the above embodiment, and therefore the same parts are used in common. and their explanations will be omitted.

[0057] In the winding terminal 71 described with reference to Figure 7 etc., the elastic portion 714 is a serpentine portion 712, but in this embodiment, as shown in Figure 10, the elastic portion 714 is a pin-shaped shaft portion 713 that extends linearly toward the board connection portion 711 and has a length dimension longer than that of the first leg portion 716. For example, the shaft portion 713 that constitutes 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 connecting 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. Therefore, when the end portion 710a of the plate portion 710 opposite the split insulator 320 is pressed to press-fit 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 is exemplified, 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 connecting portion, 192...second connecting portion, 311...annular portion, 312...salient pole, 320, 330...divided insulator, 321, 331...outer peripheral portion, 322, 332...inner peripheral portion, 326...first hole, 327...second hole, 350...winding, 710, 720...plate portion, 711...substrate connecting portion, 712...serpentine portion, 713...shaft portion, 714...elastic portion, 715, 725...leg portion, 716, 726...first leg portion, 717, 727...second leg portion, 721...winding connecting portion, 721(U)...first winding connecting portion, 721(V)...second winding connecting portion, 721(W)...third winding connecting 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 held by the insulator and connected to a winding extending from the coil; a substrate connected to the winding terminals; and 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 inside, the insulator includes an outer peripheral portion that overlaps an annular portion that extends annularly on an outer peripheral side 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 peripheral portion in the motor axial direction, a circumferential width of the plate portion is narrower than a maximum circumferential width of the coil wound around the salient pole, the plate portion is located closer to the substrate than the end face of the insulator closest to the substrate, The motor is characterized in that the winding connection portion is located closer to the substrate than the end face of the insulator closest to the substrate, and holds the winding along the circumferential direction.

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 overlap the coil in the radial direction 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. 5. The motor according to claim 1, The motor is characterized in that 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 plate portion has an end portion of the stress transmission suppression portion exposed from the resin sealing member.

7. 7. The motor according to claim 1, The motor is 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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