Motors and pumps

Abstract

To provide a motor and a pumping device that can suppress the application of stress to a first connection portion to which a winding terminal is connected and a second connection portion to which a connector terminal is connected in a substrate fixed to a resin housing.SOLUTION: In a motor, in a substrate 19 fixed to a resin housing 6, a first connection portion 191 with a winding terminal 71, a second connection portion 192 with a connector terminal 75, a first fixing portion 97 with a first screw 91, and a second fixing portion 98 with a second screw 92 are arranged along the edge of the substrate 19. The first fixing portion 97 is arranged at the center or substantially the center of the substrate 19 in the second direction Y, and the second fixing portion 98 is arranged at the center or substantially the center of the substrate 19 in the second direction Y. Further, an angle range in which the first connection portion 191 is arranged and an angle range in which the second connection portion 192 is arranged are regions including the center of the first direction X of the substrate 19.SELECTED DRAWING: Figure 9

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] Patent Document 1 proposes a motor having a stator core with multiple salient poles arranged circumferentially around the motor axis, an insulator held by the stator core, and coils wound around the salient poles via the insulator. The motor connects windings extending from the coils to winding terminals held by the insulator, and then covers the stator core, insulator, and coils with a resin housing. In the motor described in Patent Document 1, multiple connector terminals are connected to the housing, and a substrate is fixed to an end of the housing, electrically connecting the multiple connector terminals to the multiple winding terminals. Accordingly, the substrate is provided with, in order along the outer periphery of the substrate, multiple first connection portions electrically connecting the multiple winding terminals to the substrate, a fixing portion fixing the substrate to the housing with second screws, and multiple second connection portions electrically connecting the multiple connector terminals to the substrate. The multiple first connection portions and second connection portions are located on opposite sides of the center of the substrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Utility Model Registration No. 209233673 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology described in Patent Document 1 has a problem in that the board is fixed to the housing with a screw at one fixing point, so that external vibrations can cause the board to bend, placing excessive stress on the first and second connection points.

[0005] In view of the above problems, an object of the present invention is to provide a motor and a pump device that can suppress the application of stress to a first connection portion to which a winding terminal is connected and a second connection portion to which a connector terminal is connected, in a substrate fixed to a resin housing. [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, coils wound around the salient poles via the insulator, a plurality of winding terminals held by the insulator and connected to windings extending from the coils, a resin housing covering the stator core, the insulator, and the coils, a plurality of connector terminals held by the housing, and a board arranged at an end of the housing and to which the plurality of connector terminals and the plurality of winding terminals are respectively electrically connected, and the board is fixed to the housing with a first screw. a first fixing portion that fixes the board to the housing with a second screw; a plurality of first connection portions that electrically connect the plurality of winding terminals to the board; and a plurality of second connection portions that electrically connect the plurality of connector terminals to the board, are arranged along an edge of the board, and when a direction perpendicular to the motor axis is defined as a first direction and a direction perpendicular to the motor axis and the first direction is defined as a second direction, the plurality of first connection portions are arranged at a position spaced apart on one side of an imaginary line connecting the first fixing portion and the second fixing portion in the second direction, and the plurality of second connection portions are arranged at a position spaced apart on the other side of the second direction from the imaginary line.

[0007] In the present invention, because the substrate is fixed by the first fixing portion and the second fixing portion, bending of the substrate is unlikely to occur, and the first connecting portion and the second connecting portion are unlikely to be damaged. Even in this case, the first connecting portion is positioned at a distance from an imaginary line connecting the first fixing portion and the second fixing portion to one side in the second direction, and the second connecting portion is positioned at a distance from the imaginary line to the other side in the second direction, so the first connecting portion and the second connecting portion are spaced apart from the first fixing portion and the second fixing portion. Therefore, even if stress occurs in the first fixing portion and the second fixing portion due to the difference in thermal expansion coefficients between the resin housing and the substrate, the stress is unlikely to be transmitted to the first connecting portion and the second connecting portion. Therefore, the first connecting portion and the second connecting portion are unlikely to be damaged.

[0008] In the present invention, an embodiment can be adopted in which the first fixing portion is arranged at or approximately at the center of the substrate in the second direction, the second fixing portion is arranged at or approximately at the center of the substrate in the second direction, and the angular range in which the multiple first connection portions are arranged when centered on the motor axis and the angular range in which the multiple second connection portions are arranged when centered on the motor axis are both areas that include the center of the substrate in the first direction.

[0009] In the present invention, an embodiment can be adopted in which the multiple connector terminals are arranged along the first direction, and the multiple winding terminals are arranged along a circumferential direction centered on the motor axis.

[0010] In the present invention, the substrate has a circular planar shape as a whole, the housing has an annular wall portion surrounding the substrate, and the first fixing portion is wall part The first screw penetrates the substrate and is fastened to the first pillar portion in a state where the substrate is in contact with the first pillar portion provided at a position spaced apart radially inward from the substrate. wall part The axial direction of the axial groove is In one embodiment, the second screw penetrates the substrate and is fastened to the second columnar section with the substrate in contact with the second columnar section. According to this embodiment, even if the housing expands or contracts due to temperature changes, stress caused by such deformation is unlikely to be transmitted from the wall section to the substrate via the first columnar section and the second columnar section.

[0011] In the present invention, the stator core may have the salient poles protruding radially inward from an annular portion, and at least a portion of the first columnar portion and at least a portion of the second columnar portion overlapping the annular portion when viewed from the motor axial direction. According to this aspect, deformation of the first columnar portion and the second columnar portion can be suppressed by the stator core.

[0012] In the present invention, the insulator may be made up of a plurality of divided insulators provided corresponding to the plurality of salient poles, respectively.

[0013] In the present invention, when viewed from the motor axial direction, at least a portion of the first columnar portion and at least a portion of the second columnar portion may overlap the annular portion via a space between two adjacent segment insulators among the plurality of segment insulators. According to this aspect, the first columnar portion and the second columnar portion overlap the stator core via a space between the segment insulators. Therefore, deformation of the first columnar portion and the second columnar portion can be suppressed by the stator core.

[0014] In the present invention, the plurality of winding terminals are each held by a different one of the plurality of split insulators, and the first fixing portion and the second fixing portion are both disposed on the other side in the second direction from the center of the substrate in the second direction. According to this aspect, the first connecting portion and the second connecting portion can be spaced apart from the first fixing portion and the second fixing portion.

[0015] 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]

[0016] In the present invention, because the substrate is fixed by the first fixing portion and the second fixing portion, bending of the substrate is unlikely to occur, and the first connecting portion and the second connecting portion are unlikely to be damaged. Even in this case, the first connecting portion is positioned at a distance from an imaginary line connecting the first fixing portion and the second fixing portion to one side in the second direction, and the second connecting portion is positioned at a distance from the imaginary line to the other side in the second direction, so the first connecting portion and the second connecting portion are spaced apart from the first fixing portion and the second fixing portion. Therefore, even if stress occurs in the first fixing portion and the second fixing portion due to the difference in thermal expansion coefficients between the resin housing and the substrate, the stress is unlikely to be transmitted to the first connecting portion and the second connecting portion. Therefore, the first connecting portion and the second connecting portion are unlikely to be damaged. [Brief explanation of the drawings]

[0017] [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]FIG. 4 is an explanatory diagram of the layout of the first fixing portion and the second fixing portion shown in FIG. 3 . DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, motors and pump devices according to embodiments 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 directions on the radially inner side and the radially outer side refer 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.

[0019] (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.

[0020] 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, and the suction pipe 21 and the discharge pipe 22 each have a suction port 21a and a discharge port 22a at their ends. The intake pipe 21 is provided concentrically with the motor axis L.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In the rotor 4, a cylindrical radial bearing 11 is held by caulking or other methods 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 a 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 pump chamber 20 side, and limits the movable range of the support shaft 5 toward the pump chamber 20. The case 2 has three support portions 27 extending from the inner circumferential 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. An annular thrust bearing 12 is attached to the second end 52 of the support shaft 5, 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 with 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 with a D-shaped cross section. Therefore, the support shaft 5 and the thrust bearing 12 are prevented from rotating.

[0025] 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.

[0026] (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.

[0027] As shown in FIGS. 2, 3, and 4, one side L1 of the housing 6 in the direction of the motor axis L is A cover 18 is fixed to the end 64 from one side L1 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.

[0028] 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 columnar portion 67 that protrudes 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 a first screw 91, which is a tapping screw that penetrates a notch 197 formed in the edge of the substrate 19, to the first columnar portion 67. The housing 6 is also formed with a second columnar portion 68 that protrudes from the bottom wall 63 toward the 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 a second screw 92, which is a tapping screw that penetrates a notch 199 formed in the edge of the substrate 19, to the second columnar portion 68.

[0029] 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. 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 are formed.

[0030] 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 by 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 from the suction pipe 21 and discharged from the discharge pipe 22.

[0031] 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.

[0032] 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.

[0033] The motor 10 is a three-phase motor. Therefore, the plurality of coils 35 includes a U-phase coil. A first-phase coil 35(U), 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 are arranged in this order. 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.

[0034] 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).

[0035] 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.

[0036] 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.

[0037] (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. Note that in Figs. 6 and 7, as in Fig. 3 etc., one side L1 in the direction of the motor axis L is the upper side.

[0038] 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.

[0039] 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.

[0040] In this embodiment, the winding terminal 71 has an elastic portion 714 that is elastically deformable between the plate portion 710 and the board connecting portion 711. 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 connecting portion 718 are covered with the resin sealing member 60, but the board connecting portion 711 and the elastic portion 714 are not covered with the resin sealing member 60. 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] (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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The three winding connection portions 721 include a first winding connection portion 721(U), a second winding connection portion 721(V) provided on the other circumferential side CCW of the first winding connection portion 721(U), and a third winding connection portion 721(W) provided between the first 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 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) to guide the end 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 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, making it easy to connect to the common terminal 72.

[0052] As described above, in the motor 10 and pump device 1 of this embodiment, the common terminal 72 has one leg 725 provided between each pair of adjacent winding connection portions 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 on either end 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. In addition, since the number of legs 725 is small, the common terminal 72 can be easily attached to the insulator 32 .

[0053] 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.

[0054] 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.

[0055] (Layout of the first fixing portion 97 and the second fixing portion 98, etc.) Fig. 9 is an explanatory diagram of the layout of the first fixed portion 97 and the second fixed portion 98 shown in Fig. 3. In Fig. 9, the center line Cx of the substrate 19 in the first direction X and the center line Cy of the substrate 19 in the second direction Y are shown by dashed dotted lines. Also, the imaginary line S connecting the first fixed portion 97 and the second fixed portion 98 is shown by a dashed two-dotted line.

[0056] 4 and 9, the substrate 19 has a circular planar shape as a whole, and an annular wall portion 640 that surrounds the substrate is provided at the end portion 64 of the housing 6. Also, a notch 199 is formed at the end portion of the substrate 19, into which a protrusion 645 that protrudes radially inward from the wall portion 640 fits, and the substrate 19 is fixed by a first fixing portion 97 and a second fixing portion 98 in a state where it is positioned in the circumferential direction by the protrusion 645 and the notch 199.

[0057] Here, the first fixed portion 97, the second fixed portion 98, the plurality of first connecting portions 191, and the plurality of second connecting portions 192 are arranged along the edge of the substrate 19. Furthermore, if the direction perpendicular to the motor axis L is defined as a first direction X and the direction perpendicular to the motor axis L and the first direction X is defined as a second direction Y, the first fixed portion 97 is arranged on one side X1 of the center of the substrate 19 in the first direction X, and the second fixed portion 98 is arranged on the other side X2 of the center of the substrate 19 in the first direction X. More specifically, the first fixed portion 97 is arranged at or approximately at the center of the substrate 19 in the second direction Y, and the second fixed portion 98 is arranged at or approximately at the center of the substrate 19 in the second direction Y. Furthermore, the angular range in which the plurality of first connecting portions 191 are arranged when centered on the motor axis L and the angular range in which the plurality of second connecting portions 192 are arranged when centered on the motor axis L are both regions that include the center of the substrate 19 in the first direction X. The first connecting portions 191 are arranged along the circumferential direction at positions spaced apart from the imaginary line S connecting the first fixing portion 97 and the second fixing portion 98 to one side Y1 in the second direction Y, and the second connecting portions 192 are arranged along the circumferential direction at positions spaced apart from the imaginary line S connecting the first fixing portion 97 and the second fixing portion 98 to one side Y1 in the second direction Y. 1st direction It is arranged along the Y.

[0058] In this manner, in this embodiment, since the substrate 19 is fixed by the first fixing portion 97 and the second fixing portion 98, bending of the substrate 19 is unlikely to occur. Therefore, the reliability of the first connecting portion 191 and the second connecting portion 192 is high, for example, cracks are unlikely to occur in the solder of the first connecting portion 191 and the second connecting portion 192. Even in this case, the first connecting portion 191 is disposed at a position spaced apart from the imaginary line S connecting the first fixing portion 97 and the second fixing portion 98 to one side Y1 in the second direction Y, and the second connecting portion 192 is disposed at a position spaced apart from the imaginary line S to the other side Y2 in the second direction Y. Therefore, the first connecting portion 191 and the second connecting portion 192 are unlikely to bend when the first fixing portion 97 and the second fixing portion 98 are fixed together. Therefore, even if stress occurs in the first fixing portion 97 and the second fixing portion 98 due to the difference in the thermal expansion coefficient between the resin housing 6 and the substrate 19, the stress is not easily transmitted to the first connecting portion 191 and the second connecting portion 192. Therefore, cracks are less likely to occur in the solder of the first connecting portion 191 and the second connecting portion 192, and the reliability of the first connecting portion 191 and the second connecting portion 192 is high.

[0059] 5 and 6 , the multiple winding terminals 71 are held by different split insulators 320 among the multiple split insulators 320. This restricts the first connection portion 191 from being positioned at the center of the substrate 19 in the first direction X. Therefore, the first connection portion 191 is biased toward the other circumferential side CCW from the center of the substrate 19 in the first direction X. In accordance with this layout, in this embodiment, both the first fixed portion 97 and the second fixed portion 98 are positioned on the other side Y2 in the second direction Y from the center of the substrate 19 in the second direction Y. Therefore, both the first connection portion 191 and the second connection portion 192 can be spaced apart from the first fixed portion 97 and the second fixed portion 98.

[0060] In this embodiment, as shown in FIG. 5 , when viewed from the direction of the motor axis L, at least a portion of the first columnar portion 67 and at least a portion of the second columnar portion 68 overlap the annular portion 311 of the stator core 31. Here, since the stator core 31 holds a plurality of split insulators 320, when viewed from the direction of the motor axis L, at least a portion of the first columnar portion 67 and at least a portion of the second columnar portion 68 overlap the annular portion 311 of the stator core 31 via two adjacent split insulators 320 among the plurality of split insulators 320. Therefore, even when the housing 6 expands or contracts due to temperature changes, deformation of the first columnar portion 67 and the second columnar portion 68 can be suppressed by the stator core 31. Therefore, the expansion or contraction of the housing 6 is unlikely to be transmitted to the substrate 19 via the first columnar portion 67 and the second columnar portion 68.

[0061] [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]

[0062] REFERENCE SIGNS LIST 1...pump device, 2...case, 3...stator, 4...rotor, 6...housing, 10...motor, 19...board, 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 columnar portion, 68...second columnar portion, 69...connector housing, 71...winding terminal, 72...common terminal, 75...connector terminal, 91...first screw, 92...second Screw, 97...first fixing portion, 98...second fixing portion, 191...first connecting portion, 192...second connecting portion, 311...annular portion, 312...salient pole, 320, 330...split insulator, 321, 331...outer peripheral portion, 322, 332...inner peripheral portion, 326...first hole, 327...second hole, 350...winding, 711...substrate connecting portion, 720...plate portion, 721...winding connecting portion, 721(U)...first winding connecting portion, 721(V)...second winding connecting portion, 721(W)...third winding connecting portion, 715, 725...leg portion, 716, 726...first leg portion, 717, 727...second leg 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 plurality of winding terminals held by the insulator and connected to windings extending from the coil; a resin housing that covers the stator core, the insulator, and the coil; a plurality of connector terminals held in the housing; a substrate disposed at an end of the housing, the substrate being electrically connected to the plurality of connector terminals and the plurality of winding terminals; and a first fixing portion that fixes the substrate to the housing with a first screw, a second fixing portion that fixes the substrate to the housing with a second screw, a plurality of first connection portions that electrically connect the plurality of winding terminals to the substrate, and a plurality of second connection portions that electrically connect the plurality of connector terminals to the substrate are arranged along an edge of the substrate, When a direction perpendicular to the motor axis is defined as a first direction, and a direction perpendicular to the motor axis and the first direction is defined as a second direction, the first fixing portion is disposed on one side of the center of the substrate in the first direction, the second fixing portion is disposed on the other side of the center of the substrate in the first direction, the plurality of first connection portions are disposed at positions spaced apart from an imaginary line connecting the first fixed portion and the second fixed portion on one side in the second direction, The motor is characterized in that the plurality of second connection portions are arranged at positions spaced apart from the imaginary line on the other side in the second direction.

2. 2. The motor according to claim 1, the first fixing portion is disposed at a center or approximately a center of the substrate in the second direction, the second fixing portion is disposed at a center or approximately a center of the substrate in the second direction, a motor characterized in that the angular range in which the plurality of first connection portions are arranged when centered on the motor axis, and the angular range in which the plurality of second connection portions are arranged when centered on the motor axis, are both regions that include the center of the substrate in the first direction.

3. 3. The motor according to claim 1, The plurality of first connection portions are arranged along the circumferential direction, The motor, wherein the plurality of second connection portions are arranged along the first direction.

4. The motor according to any one of claims 1 to 3, the substrate has an overall circular planar shape, the housing includes an annular wall portion surrounding the substrate; In the first fixing portion, the first screw penetrates the substrate and is fastened to a first pillar-shaped portion provided in the housing at a position spaced radially inward from the wall portion, with the substrate being in contact with the first pillar-shaped portion, The motor is characterized in that, in the second fixing portion, the substrate is in contact with a second columnar portion provided in the housing at a position radially inward from the wall portion, and the second screw penetrates the substrate and is fastened to the second columnar portion.

5. 5. The motor according to claim 4, The stator core has a plurality of salient poles that protrude radially inward from a circular ring portion, The motor, wherein, when viewed from the axial direction of the motor, at least a portion of the first columnar portion and at least a portion of the second columnar portion overlap with the annular portion.

6. 6. The motor according to claim 5, The motor is characterized in that the insulator comprises a plurality of divided insulators provided corresponding to the plurality of salient poles, respectively.

7. 7. The motor according to claim 6, When viewed from the motor axial direction, at least a portion of the first columnar portion and at least a portion of the second columnar portion overlap with the annular portion between two adjacent split insulators among the plurality of split insulators.

8. 8. The motor according to claim 6 or 7, the plurality of winding terminals are each held by a different split insulator among the plurality of split insulators, The motor, characterized in that the first fixed portion and the second fixed portion are both arranged on the other side in the second direction from the center of the substrate in the second direction.

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

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