Motor and pumping device

Abstract

To provide a motor and a pump device with which, when establishing electrical continuity between a stator core and a board with a conduction terminal, it is possible to bring the stator core and the conduction terminal into reliable contact with each other.SOLUTION: A motor 10 comprises: a stator core 31; multiple phase coils 35 that are wound via an insulator 32; a board 19 that is electrically connected to a plurality of windings equal to the number of phases extending from each of the multiple phase coils 35, and that is located at one side L1 of the stator core 31 in a motor axial direction L; and a conduction terminal 73 that electrically connects the board 19 and the stator core 31. The conduction terminal 73 includes a body part 730, a board connection part 731 that extends from one side L1 of the body part 730 in the motor axial direction L and electrically connects to the board 19, and a core connection part 732 that extends to the other side L2 of the body part 730 in the motor axial direction L and electrically connects to the stator core 31. The core connection part 732 is secured to the stator core 31 by welding.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a motor having a multi-phase coil and a pump device.

Background Art

[0002] A motor having a stator core covered with a case member, a multi-phase coil wound around the stator core, and a substrate electrically connected to a winding extending from each of the coils is described in Patent Document 1. The motor of this document includes a conduction connecting plate that makes the stator core and the substrate in a conductive state. The upper end portion of the conduction connecting plate is bent into a V-shaped cross section and has a spring action. The upper end portion of the conduction connecting plate is inserted into the gap between the stator core and the case member facing the stator core. When the upper end portion of the conduction connecting plate is inserted into the gap, the upper end portion of the conduction connecting plate contacts the stator core elastically. The lower end portion of the conduction connecting plate is fixed to the substrate by a fastening bolt while being sandwiched between the substrate and the case member. Thereby, the stator core and the substrate are in a conductive state.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique described in Patent Document 1, since the upper end portion of the conduction connecting plate only contacts the stator core elastically, there is a risk that the contact between the upper end portion of the conduction connecting plate and the stator core becomes insufficient due to vibration of the motor or the like. Further, depending on the dimensional shape of the upper end portion of the conduction connecting plate and the gap, there is a risk that the contact between the upper end portion of the conduction connecting plate and the stator core becomes insufficient. Due to these, in the technique described in Patent Document 1, there is a risk that the stator core and the substrate may not be in a conductive state.

[0005] In view of the above problems, the object of the present invention is to provide a motor and a pump device that can reliably bring the stator core and the conductive terminal into contact when the stator core and the substrate are electrically connected by the conductive terminal. [Means for solving the problem]

[0006] To solve the above problems, the motor of the present invention comprises a stator core in which a plurality of salient poles are arranged in the circumferential direction centered on the motor axis, an insulator held on the stator core, a plurality of phase coils wound around the salient poles via the insulator, a plurality of windings corresponding to the number of phases extending from each of the plurality of phase coils, and a substrate disposed on one side of the stator core in the axial direction along the motor axis, and a conductive terminal that electrically connects the substrate and the stator core, wherein the conductive terminal comprises a main body portion oriented radially in the thickness direction, a substrate connection portion extending from the main body portion to one side in the axial direction and electrically connected to the substrate, a core connection portion extending from the main body portion to the other side in the axial direction and electrically connected to the stator core, and a holding portion held by the insulator, and the core connection portion is fixed to the stator core by welding.

[0007] According to the present invention, the conductive terminal is fixed to the stator core by welding. In this way, the stator core and the conductive terminal are firmly fixed by welding, so that poor contact between the stator core and the conductive terminal due to motor vibrations, etc., can be suppressed. As a result, the stator core and the substrate are reliably electrically connected, so the stator core This allows for more reliable suppression of the generated noise.

[0008] In the present invention, the core connection portion preferably comprises an extended portion extending in the direction of the motor axis and a bent portion extending radially from the other end of the extended portion, wherein the bent portion abuts against the stator core and is fixed to the stator core by welding. In this way, since the bent portion abuts against the stator core, the conductive terminal can be fixed in an axially positioned state.

[0009] In the present invention, the main body portion is a plate shape extending in the axial direction, the holding portion is the circumferential end portions of the main body portion, and the insulator may be provided with a holding groove into which the holding portion fits from the axial direction.

[0010] In the present invention, it is preferable that the retaining groove is provided with a positioning rib protruding from the inner circumferential surface. In this way, the positioning rib contacts the retaining portion when the retaining portion is fitted into the retaining groove, thereby positioning the retaining portion, and the conductive terminal is positioned on the insulator and held in a press-fit state.

[0011] In the present invention, the bent portion extends radially outward from the other end of the extended portion, and it is preferable that the insulator is provided with a notch cut out in the axial direction on the radially outward side of the retaining groove. In this way, the core connection portion can be accommodated in the notch, so that the radial thickness of the insulator and the conductive terminal does not increase when a conductive terminal is attached to the insulator. In addition, welding of the bent portion and the stator core can be performed from the radially outward side, making the welding work easier.

[0012] In the present invention, the retaining portion comprises a first leg portion located on one side in the circumferential direction relative to the core connection portion and protruding from the main body portion on the other side in the axial direction, and a second leg portion located on the other side in the circumferential direction relative to the core connection portion and protruding from the main body portion on the other side in the axial direction, and the insulator may be provided with a first hole into which the first leg portion fits and a second hole into which the second leg portion fits. In this case, in the present invention, it is preferable that one of the first hole and the second hole is a press-fit hole and the other is a guide hole. In this way, since the other of the first hole and the second hole is for guidance, it is easier to attach the common terminal to the insulator than when both legs are press-fitted.

[0013] In the present invention, both the first leg portion and the second leg portion may be rectangular bars with a square cross-section, the press-fit hole may have a circular cross-section, and the guide hole may have a square cross-section.

[0014] In the present invention, it is preferable that the guide hole is provided with a positioning rib that protrudes radially from the inner circumferential surface. In this way, when the other leg is fitted into the guide hole, the rib will come into contact with the other leg, thereby enabling radial positioning of the other leg.

[0015] In the present invention, the bent portion extends radially outward from the other end of the extended portion, and it is preferable that the insulator has a notch cut out in the axial direction between the first hole and the second hole. In this way, the core connection portion can be housed in the notch, so when a conductive terminal is attached to the insulator, it is possible to suppress an increase in the radial thickness of the insulator and the conductive terminal. In addition, welding of the bent portion and the stator core can be performed from the radial outside, making the welding work easier.

[0016] In the present invention, it is preferable that the conductive terminal has a winding connection portion that is bent to hold the ends of the plurality of windings inward. In this way, the terminal used to control the motor can be a conductive terminal.

[0017] In the present invention, the winding connection portion comprises a first winding connection portion to which the ends of some of the windings among the plurality of windings reach from one side in the circumferential direction, and a second winding connection portion to which the ends of other some of the windings among the plurality of windings reach from the other side in the circumferential direction, wherein the first winding connection portion is located on one side in the circumferential direction with respect to the first leg portion, and the second winding connection portion is located on the other side in the circumferential direction with respect to the second leg portion.

[0018] In the present invention, the insulator consists of a plurality of segmented insulators, each corresponding to one of the plurality of salient poles, and the conductive terminal can be held in one of the first segmented insulators. In this way, since the conductive terminal is provided in one segmented insulator, the relative positional accuracy of the holes for fitting the legs is high. Therefore, it is easy to attach the conductive terminal to the insulator.

[0019] In the present invention, among the plurality of divided insulators, the second divided insulator located on one side in the circumferential direction relative to the first divided insulator is provided with a groove for guiding some of the windings, the groove comprising a first wall located radially inward, a second wall located radially outward relative to the first wall, and a bottom connecting the first wall and the second wall, the bottom being inclined toward the other side in the circumferential direction toward one side in the axial direction, and preferably the other end of the bottom in the circumferential direction overlaps with a part of the first winding connection portion when viewed from a direction perpendicular to the axis. In this way, when some of the windings are guided from the groove to the first winding connection portion, they are at the same height as the first winding connection portion, making it easier to connect the ends of some of the windings to the first winding connection portion.

[0020] In the present invention, the press-fitting hole penetrates in the axial direction, the stator core includes a third hole that overlaps with one side that becomes the press-fitting hole in the axial direction, and it is preferable that one of the first leg portion and the second leg portion that fits into the press-fitting hole is press-fitted into the third hole. In this way, since one of the first leg portion and the second leg portion of the conduction terminal is press-fitted into the third hole of the stator core, the conduction terminal is difficult to come out of the insulator.

[0021] The motor according to the present invention can be used in a pump device. In this case, the pump device has an impeller that is rotationally driven by the motor.

Effects of the Invention

[0022] In the present invention, the conduction terminal is fixed to the stator core by welding. Therefore, it is possible to suppress the conduction failure between the stator core and the conduction terminal due to the vibration of the motor or the like. As a result, the stator core and the substrate are surely in a conductive state, so that the noise generated in the stator core can be more surely suppressed.

Brief Description of the Drawings

[0023] [Figure 1] It is a perspective view showing one aspect of a pump device and a motor to which the present invention is applied. [Figure 2] It is a longitudinal sectional view of the pump device and the motor shown in FIG. 1. [Figure 3] It is an exploded perspective view showing a state where the cover is removed from the pump device shown in FIG. 1. [Figure 4] It is an exploded perspective view showing a state where the substrate is removed from the state shown in FIG. 3. [Figure 5] It is an exploded perspective view showing a state where the housing and the stator are separated in the motor shown in FIG. 1. [Figure 6] A perspective view of the vicinity of the common terminal shown in FIG. 5 as viewed from the inner side in the radial direction. [Figure 7] A perspective view of the vicinity of the common terminal shown in FIG. 5 as viewed from the outer side in the radial direction. [Figure 8] Figure 5 is a perspective view of the common terminal. [Figure 9] Figure 5 is a perspective view of the area near the conductive terminals, seen from the radially outer side. [Figure 10] This is a disassembled perspective view showing the conductive terminals separated from the insulator. [Figure 11] Figure 10 is a perspective view of the insulator as seen from one side in the direction of the motor axis. [Figure 12] This is a perspective view of the area near the common terminal of the motor in Embodiment 2, viewed from the radially outer side. [Figure 13] This is a perspective view of the area near the common terminal of the motor of Embodiment 2, viewed from the radially inner side. [Figure 14] This is a disassembled perspective view showing the common terminal separated from the insulator. [Figure 15] Figure 14 shows the insulator as viewed from one side in the direction of the motor axis. [Figure 16] This is a perspective view of the area near the common terminal of a motor in another embodiment, viewed from the radially outer side. [Modes for carrying out the invention]

[0024] Hereinafter, a motor and pump device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the motor axis L direction means the axial direction along the motor axis L, the radial direction on the inside and outside of the radial direction means the radial direction centered on the motor axis L, and the circumferential direction means the rotational direction centered on the motor axis L.

[0025] (Overall structure) Figure 1 is a perspective view showing one embodiment of a pump device 1 and motor 10 to which the present invention is applied. Figure 2 is a cross-sectional view of the pump device 1 and motor 10 shown in Figure 1. In Figures 1 and 2, the pump device 1 includes a case 2, a motor 10 positioned on one side L1 in the direction of the motor axis L relative to the case 2, and an impeller 25 positioned in a pump chamber 20 inside the case 2. The impeller 25 is rotationally driven by the motor 10 around the motor axis L. The motor 10 includes a cylindrical stator 3, a rotor 4 positioned inside the stator 3, a resin housing 6 covering the stator 3, and a round bar-shaped support shaft 5 that rotatably supports the rotor 4. The support shaft 5 is made of metal or ceramic. In this embodiment of the pump device 1, the fluid is a liquid, and the pump device 1 is used as an on-board pump where ambient temperature and fluid temperature are prone to change.

[0026] Case 2 constitutes the side wall 23 on the other side L2 of the motor axis L direction of the pump device 1, and the side wall 29 extending in the circumferential direction. Case 2 includes a suction pipe 21 extending along the motor axis L and a discharge pipe 22 extending in a direction perpendicular to the motor axis L. The suction pipe 21 has an inlet 21a. The discharge pipe 22 has a discharge port 22a. The suction pipe 21 is provided concentrically with respect to the motor axis L.

[0027] The stator 3 comprises a stator core 31, insulators 32 and 33 held by the stator core 31, and a coil 35 wound around the stator core 31 via the insulators 32 and 33.

[0028] The rotor 4 includes a cylindrical portion 40 that extends axially L from a position facing the stator 3 radially inward to the pump chamber 20. The cylindrical portion 40 opens in the pump chamber 20. A cylindrical magnet 47, facing the stator 3 radially inward, is held on the outer circumferential surface of the cylindrical portion 40. The magnet 47 is, for example, a neodymium bonded magnet.

[0029] A disc-shaped flange portion 45 is formed at the other end L2 of the cylindrical portion 40 in the direction of the motor axis L. A disc 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 disc 26. On the surface facing 5, multiple blade portions 261 are formed at equal angular intervals, extending radially outward from around the central hole 260 in an arc shape. The disc 26 is fixed to the flange portion 45 via the blade portions 261. Thus, the flange portion 45 and the disc 26 constitute the impeller 25 connected to the cylindrical portion 40 of the rotor 4. In this embodiment, the radially outward side of the disc 26 is inclined towards the flange portion 45 more than the radially inward side.

[0030] A cylindrical radial bearing 11 is held radially inside the cylindrical portion 40. The rotor 4 is rotatably supported on the support shaft 5 via the radial bearing 11. The first end 51 of the support shaft 5 on one side L1 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. The case 2 has a receiving portion 280 formed on the second end 52 of the support shaft 5 on the pump chamber 20 side, which faces the pump chamber 20 side and limits the range of motion of the support shaft 5 toward the pump chamber 20 side. The case 2 includes a support portion 27 that extends from the inner circumferential surface of the suction pipe 21 toward the motor 10 side. A cylindrical portion 28 is formed at the end of the support portion 27, on which the support shaft 5 is positioned inward. The receiving portion 280 is formed by the bottom of the cylindrical portion 28 on the other side L2 in the direction of the motor axis L. An annular thrust bearing 12 is mounted on the second end 52 of the support shaft 5. The thrust bearing 12 is positioned between the radial bearing 11 and the cylindrical portion 28. Here, the first end portion 51 and the shaft hole 65 are formed in a D-shaped cross-section at least in part, and the second end portion 52 of the support shaft 5 and the hole in the thrust bearing 12 are also formed in a D-shaped cross-section. Thus, rotation of the support shaft 5 and the thrust bearing 12 is prevented.

[0031] The housing 6 comprises a first partition wall portion 61 that opposes the side wall 23 of the pump chamber 20, a second partition wall portion 62 interposed between the stator 3 and the magnet 47, and a cylindrical body portion 66 that covers the stator 3 from the radially outside. Thus, the housing 6 is a resin sealing member 60 that covers the stator 3 from both radial sides and both sides in the direction of the motor axis L. The resin sealing member 60 is the resin portion when the stator 3 is insert-molded using polyphenylene sulfide (PPS) or the like.

[0032] (Detailed configuration of motor 10) Figure 3 is an exploded perspective view showing the pump device 1 shown in Figure 1 with the cover 18 removed. Figure 4 is an exploded perspective view showing the circuit board 19 removed from the state shown in Figure 3. Figure 5 is an exploded perspective view showing the motor 10 shown in Figure 1 with the housing 6 and stator 3 disassembled.

[0033] As shown in Figures 2, 3, and 4, a cover 18 is fixed to one end L1 of the housing 6 in the direction of the motor axis L, from one side L1 of the motor axis L. Between the cover 18 and the bottom wall 63 of the housing 6, a circuit board 19 is placed, which is equipped with circuits for controlling the power supply to the coil 35.

[0034] The substrate 19 is fixed to the housing 6 by a first fixing part 97 using a first screw 91 and a second fixing part 98 using a second screw 92. The housing 6 has a first cylindrical part 67 that protrudes from the bottom wall 63 toward one side L1 in the direction of the motor axis L. The first fixing part 97 is formed by fastening the first screw 91 to the first cylindrical part 67 through a notch 197 formed on the edge of the substrate 19. The housing 6 also has a second cylindrical part 68 that protrudes from the bottom wall 63 toward one side L1 in the direction of the motor axis L. The second fixing part 98 is formed by fastening the second screw 92 to the second cylindrical part 68 through a notch 198 formed on the edge of the substrate 19.

[0035] The circuit board 19 is provided with a plurality of first connection parts 191, a second connection part 192, a third connection part 193, and a plurality of fourth connection parts 194. The plurality of first connection parts 191 are metal protruding from the stator 3 through the bottom wall 63 of the housing 6 to one side L1 in the direction of the motor axis L. The winding terminal 71 is connected by solder. The second connection part 192 is connected by solder to a metal common terminal 72 that protrudes from the stator 3 through the bottom wall 63 of the housing 6 and outwards on one side L1 in the direction of the motor axis L. The third connection part 193 is connected by solder to a metal conductive terminal 73 that protrudes from the stator 3 through the bottom wall 63 of the housing 6 and outwards on one side L1 in the direction of the motor axis L. The fourth connection part 194 is connected by solder to a metal connector terminal 75 held in the housing 6. Wiring and the like are formed on the circuit board 19 to electrically connect the first connection part 191, the second connection part 192, the third connection part 193 and the multiple fourth connection parts 194 via drive circuits and the like mounted on the circuit board 19.

[0036] A cylindrical connector housing 69 is formed in the housing 6. The ends of the connector terminals 75 are located inside the connector housing 69. Therefore, when a connector is connected to the connector housing 69 and a signal is supplied, the signal is input to the drive circuit via the connector terminals 75 and the fourth connection part 194. As a result, the drive current generated in the drive circuit is supplied to each coil 35 via the first connection part 191 and the winding terminal 71, causing the rotor 4 to rotate around the motor axis L. This causes the impeller 25 to rotate inside the pump chamber 20, creating negative pressure inside the pump chamber 20, so that fluid is drawn into the pump chamber 20 from the suction pipe 21 and discharged from the discharge pipe 22.

[0037] As shown in Figures 2 and 5, the stator core 31 comprises an annular portion 311 extending in an annular shape and a plurality of salient poles 312 projecting 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 stacking thin magnetic plates made of magnetic material. On the outer circumferential surface of the annular portion 311, recesses 315 extending in the direction of the motor axis L are formed, 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 has a welded portion 310 at one point in the circumferential direction of the annular portion 311 that connects the members extending in the circumferential direction.

[0038] The insulators 32 and 33 each 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 and 33 consist of multiple segmented insulators 320 and 330, each corresponding to each of the multiple salient poles 312. Each of the multiple segmented insulators 320 and 330 includes an outer circumference portion 321 and 331 that overlaps the annular portion 311 of the stator core 311 from the direction of the motor axis L, an inner circumference portion 322 and 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 part (not shown) that connects the outer circumference portion 321 and 331 and the inner circumference portion 322 and 332. The coil 35 is wound around the salient poles 312 via the cylindrical portion forming part.

[0039] Motor 10 is a three-phase motor. Therefore, the multiple coils 35 are arranged in the following order: first-phase coil 35(U) consisting of U-phase coils, second-phase coil 35(V) consisting of V-phase coils, and third-phase coil 35(W) consisting of W-phase coils. In this embodiment, there are three of each of the first-phase coil 35(U), second-phase coil 35(V), and third-phase coil 35(W), for a total of nine coils 35. Therefore, there are nine divided insulators 320 and 330 each.

[0040] In this configuration, the first phase coil 35(U) is composed of a single winding 350. Therefore, the three first phase coils 35(U) are electrically connected in series. The same applies to the second phase coil 35(V) and the third phase coil 35(W).

[0041] Furthermore, of the nine segmented insulators 320, one segmented insulator 320 corresponds to one of the first phase coils 35(U), one segmented insulator 320 corresponds to one of the second phase coils 35(V), and one segmented insulator 320 corresponds to one of the third phase coils 35(W). Each of the outer peripheral portions 321 of the terminal 320 is held by a winding terminal 71. One end 351 of the winding 350 that constitutes 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 metal common terminal 72. In this embodiment, the other end 352 is the starting end of the winding, and the one end 351 is the ending end of the winding.

[0042] The winding terminal 71 protrudes from the split insulator 320 toward one side L1 in the direction of the motor axis L. The tip of the winding terminal 71, which is the substrate connection portion 711, is connected to the first connection portion 191 of the substrate 19 shown in Figures 2, 3, and 4. Also, as shown in Figure 4, the substrate connection portion 711 protrudes from the bottom wall 63 of the resin sealing member 60 toward one side L1 in the direction of the motor axis L and is exposed.

[0043] (Configuration of Common Terminal 72) Figure 6 is a perspective view of the area around the common terminal 72 shown in Figure 5, viewed from the radially inner side. Figure 7 is a perspective view of the area around the common terminal 72 shown in Figure 5, viewed from the radially outer side. Figure 8 is a perspective view of the common terminal 72.

[0044] As shown in Figures 6 and 7, one of the first segmented insulators 320A, which does not have a winding terminal 71, has a common terminal 72 on its outer peripheral portion 321 to which the starting ends 352 of the windings 350 extending from each of the multi-phase coils 35 are connected.

[0045] As shown in Figures 6, 7, and 8, the common terminal 72 comprises a main body portion 720 extending circumferentially with the plate thickness direction facing radially, a substrate connection portion 721 protruding from the main body portion 720 to one side L1 in the direction of the motor axis L, two winding connection portions 722 which are protruding from two locations in the circumferential direction of the main body portion 720 and are bent so as to hold the end 352 of the winding 350 inward, and a leg portion 725 protruding from the main body portion 720 toward the first divided insulator 320A.

[0046] The substrate connection portion 721 is electrically connected to the second connection portion 192, and via the second connection portion 192, is electrically connected to the ground of the substrate 19. In this embodiment, the substrate connection portion 721 has a linear portion 721a electrically connected to the second connection portion 192, and an elastic portion 721b that is elastically deformable between the linear portion 721a and the main body portion 720. The linear portion 721a extends linearly in the direction of the motor axis L. The elastic portion 721b is curved in one direction CW in the circumferential direction. Here, as shown in Figure 4, the substrate connection portion 721 protrudes from the bottom wall 63 of the resin sealing member 60 on one side L1 in the direction of the motor axis L and is exposed.

[0047] The main body portion 720 is formed in a flat plate shape that extends linearly along the circumferential direction. The leg portion 725 is held by the first segmented insulator 320A. The leg portion 725 is provided between the winding connection portions 722.

[0048] Furthermore, the two winding connection sections 722 are bent to hold the ends 352 of the winding 350 inward. The winding connection sections 722 hold the ends 352 of the winding 350 and are electrically connected to the ends 352 of the winding 350 by fusing. Fusing is a thermal crimping process that connects the winding 350 and the winding connection sections 722 using electrical resistance.

[0049] As shown in Figures 6, 7, and 8, the two winding connection portions 722 comprise a first winding connection portion 722a and a second winding connection portion 722b provided on the other circumferential CCW side relative to the first winding connection portion 722a. The first winding connection portion 722a includes the end portion 352 of the winding 350 extending from the first phase coil 35(U) and the winding 35 extending from the second phase coil 35(V). The end 352 of terminal 0 is reached from one side CW in the circumferential direction. The end 352 of the winding 350 extending from the third phase coil 35(W) is reached from one side CW in the circumferential direction at the second winding connection 722b. The main body 720 of the common terminal 72 is provided with a through hole 720a. When winding the winding 350, a pin acting as a jig is inserted into the through hole 720a. This pin is used to guide the folded portion of the winding 350 when folding the winding 350 back from the first phase coil 35(U) to the second phase coil 35(V).

[0050] Here, as shown in Figures 6 and 7, the second segment insulator 320B, located on one side CW in the circumferential direction relative to the first segment insulator 320A, is provided with a guide groove 329 that guides the windings 350 extending from the first phase coil 35(U) and the second phase coil 35(V) to the first winding connection portion 722a of the first segment insulator 320A. The groove 329 extends circumferentially on one side L1 in the direction of the motor axis L of the outer peripheral portion 321. The groove 329 comprises a first wall portion 329a located radially inward, a second wall portion 329b located radially outward of the first wall portion 329a, and a bottom portion 329c that connects the first wall portion 329a and the second wall portion 329b. The bottom portion 329c slopes from one side CW in the circumferential direction to the other side CCW, towards one side L1 in the direction of the motor axis L. When viewed from a direction perpendicular to the motor axis L, the end portion 329d of the bottom portion 329c on the other side CCW in the circumferential direction overlaps with a part of the first winding connection portion 722a. Therefore, when the windings 350 extending from the first phase coil 35(U) and the second phase coil 35(V) are guided from the groove portion 329 to the first winding connection portion 722a, they are at the same height as the first winding connection portion 722a, making it easy to connect the ends 352 of the windings 350 extending from the first phase coil 35(U) and the second phase coil 35(V) to the first winding connection portion 722a.

[0051] As shown in Figures 6, 7, and 8, the leg portion 725 comprises a first leg portion 726 and a second leg portion 727 located on the other circumferential CCW side relative to the first leg portion 726. Corresponding to this configuration, the first segmented insulator 320A is provided with a first hole 326 into which the first leg portion 726 fits, and a second hole 327 on the other circumferential CCW side relative to the first leg portion 726 into which the second leg portion 727 fits. In this embodiment, the first hole 326 is a guide hole into which the first leg portion 726 fits, and the second hole 327 is a press-fit hole into which the second leg portion 727 fits. Here, both leg portions 725 are rectangular bar-shaped with a square cross-section. However, in this embodiment, the first hole 326 has a square cross-section, and the second hole 327 has a circular cross-section.

[0052] (Detailed configuration of conductive terminal 73) Figure 9 is a perspective view of the area around the conductive terminal 73 shown in Figure 5, viewed from the radial outside. Figure 10 is an exploded perspective view of the conductive terminal 73 separated from the insulator 32.

[0053] The conductive terminal 73 electrically connects the substrate 19 and the stator core 31. As shown in Figures 9 and 10, the conductive terminal 73 comprises a main body portion 730, a main body portion 730 extending circumferentially with the plate thickness direction oriented radially, a substrate connection portion 731 protruding from the main body portion 730 to one side L1 in the direction of the motor axis L, a core connection portion 732 protruding from the main body portion 730 to the other side L2 in the direction of the motor axis L, and a holding portion 733 held by the divided insulator 320C. The main body portion 730 has a plate shape with the plate thickness direction oriented radially and extending in the direction of the motor axis L.

[0054] The substrate connection portion 731 is electrically connected to the third connection portion 193, and via the third connection portion 193, is electrically connected to the ground of the substrate 19. As shown in Figure 4, the substrate connection portion 731 protrudes from the bottom wall 63 of the resin sealing member 60 on one side L1 in the direction of the motor axis L and is exposed.

[0055] The core connection portion 732 is electrically connected to the stator core 31. The circumferential width of the core connection portion 732 is narrower than the circumferential width of the main body portion 730. The core connection portion 732 is connected in the direction of the motor axis L. It comprises an extended portion 732a that extends in a certain direction, and a bent portion 732b that bends radially outward from the other end L2 of the motor axis L of the extended portion 732a.

[0056] In this embodiment, the retaining portion 733 is the circumferential end portions of the main body portion 730. Corresponding to this configuration, the split insulator 320C is provided with a retaining groove 328 into which the retaining portion 733 fits from one side L1 in the direction of the motor axis L. The retaining groove 328 extends from the end of the split insulator 320C toward the other side L2 in the direction of the motor axis L. The outer peripheral portion 321 of the split insulator 320C is provided with a notch 328a cut out in the direction of the motor axis L on the radially outer side of the retaining groove 328. The notch 328a extends in the direction of the motor axis L. By inserting the main body portion 730 into the retaining groove 328 from one side L1 in the direction of the motor axis L, the retaining portion 733 is held in the retaining groove 328.

[0057] Here, Figure 11 is a perspective view of the insulator 32 shown in Figure 10, viewed from one side L1 in the direction of the motor axis L. As shown in Figure 11, the retaining groove 328 is provided with a positioning rib 328b protruding from the inner circumferential surface. In this embodiment, the positioning rib 328b includes a first rib 328c protruding from the inner circumferential surface of the other side CCW in the circumferential direction to the one side CW in the circumferential direction, and a second rib 328d protruding from the inner circumferential surface of the radially outer side in the radially inward direction. The first rib 328c and the second rib 328d contact the retaining portion 733 when the retaining portion 733 is fitted into the retaining groove 328, thereby positioning the retaining portion 733. As a result, the conductive terminal 73 is positioned in the split insulator 320C and held in a press-fit state. Also, as shown in Figure 9, the core connection portion 732 is housed in the notch portion 328a. The bent portion 732b abuts against the stator core 31 and is fixed to the stator core 31 by welding. In this embodiment, the bent portion 732b and the stator core 31 are welded together by laser. As shown in Figure 9, when laser welding is performed, multiple weld marks 15 are formed that span both the bent portion 732b and the stator core 31.

[0058] (Effects and Benefits) In this embodiment, the core connection portion 732 of the conductive terminal 73 is fixed to the stator core 31 by welding. Furthermore, the substrate connection portion 731 of the conductive terminal 73 is electrically connected to the third connection portion 193, and via the third connection portion 193, it is electrically connected to the ground of the substrate 19. Therefore, since the stator core 31 and the conductive terminal 73 are firmly fixed by welding, poor contact between the stator core 31 and the conductive terminal 73 due to motor vibrations, etc., can be suppressed. As a result, the stator core 31 and the ground of the substrate 19 are reliably connected, and noise generated in the stator core 31 can be suppressed more reliably.

[0059] Furthermore, the core connection portion 732 includes an extended portion 732a extending in the direction of the motor axis L, and a bent portion 732b extending radially outward from the other end L2 of the extended portion 732a in the direction of the motor axis L. The bent portion 732b abuts against the stator core 31 and is fixed to the stator core 31 by welding. Therefore, since the bent portion 732b abuts against the stator core 31, the conductive terminal 73 can be fixed by welding while positioned in the direction of the motor axis L.

[0060] Furthermore, in this embodiment, the positioning rib 328b comprises a first rib 328c that protrudes from the inner surface of the other CCW in the circumferential direction toward the one CW in the circumferential direction, and a second rib 328d that protrudes from the inner surface of the radially outer side toward the radially inner side. Therefore, when the retaining portion 733 is fitted into the retaining groove 328, the first rib 328c and the second rib 328d abut against the retaining portion 733 and position the retaining portion 733, so that the conductive terminal 73 is positioned in the split insulator 320C and held in a press-fit state.

[0061] Furthermore, in this embodiment, the bent portion 732b extends radially outward from the other end L2 of the motor axis L of the extended portion 732a. The outer peripheral portion 321 of the split insulator 320C is provided with a notch 328a cut out in the direction of the motor axis L, on the radially outward side of the retaining groove 328. Therefore, the core connection portion 732 can be accommodated in the notch 328a, so when the conductive terminal 73 is attached to the split insulator 320C, it is possible to suppress an increase in the radial thickness of the split insulator 320C and the conductive terminal 73. In addition, welding of the bent portion 732b and the stator core 31 can be performed from the radially outward side, making the welding work easier.

[0062] (Embodiment 2) Next, the motor of Embodiment 2 will be described. The motor of Embodiment 2 differs from the motor of Embodiment 1 in that the common terminal is a conductive terminal. Therefore, in Embodiment 2, the same reference numerals are used for components identical to those in Embodiment 1, and their descriptions may be omitted. Figure 12 is a perspective view of the area around the common terminal 72 of the motor of Embodiment 2, viewed from the radially outside. Figure 13 is a perspective view of the area around the common terminal 72 of the motor of Embodiment 2, viewed from the radially inside. Figure 14 is an exploded perspective view of the common terminal 72 separated from the insulator 32.

[0063] In this configuration, the common terminal 72 is also a conductive terminal and electrically connects the substrate 19 and the stator core 31. As shown in Figures 12 and 13, the common terminal 72 in this configuration is held on the outer peripheral portion 321 of the first divided insulator 320A.

[0064] As shown in Figures 12, 13, and 14, the common terminal 72 comprises a main body portion 720 extending circumferentially with the plate thickness direction facing radially, a substrate connection portion 721 protruding from the main body portion 720 to one side L1 in the direction of the motor axis L, two winding connection portions 722 which are protruding from two locations in the circumferential direction of the main body portion 720 and are bent so as to hold the end 352 of the winding 350 inward, a leg portion 725 protruding from the main body portion 720 toward the first divided insulator 320A, and a core connection portion 724 protruding from the main body portion 720 to the other side L2 in the direction of the motor axis L.

[0065] The board connection portion 721 is electrically connected to the second connection portion 192, and via the second connection portion 192, is electrically connected to the ground of the board 19. In this embodiment, the board connection portion 721 has a straight portion 721a electrically connected to the second connection portion 192, and an elastic portion 721b that is elastically deformable between the straight portion 721a and the main body portion 720. The straight portion 721a extends linearly in the direction of the motor axis L. The elastic portion 721b is curved in the other circumferential direction CCW.

[0066] The main body 720 is formed in a flat plate shape that extends linearly along the circumferential direction. The legs 725 are held by the first segmented insulator 320A. The legs 725 are provided between the winding connection parts 722. The two winding connection parts 722 are also curved to hold the end 352 of the winding 350 inward. The winding connection parts 722 hold the end 352 of the winding 350 by fusing and are electrically connected to the end 352 of the winding 350.

[0067] The two winding connection sections 722 comprise a first winding connection section 722a and a second winding connection section 722b provided on the other circumferential side CCW relative to the first winding connection section 722a. The first winding connection section 722a receives 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 second phase coil 35(V) from one circumferential side CW. The second winding connection section 722b receives the end 352 of the winding 350 extending from the third phase coil 35(W) from one circumferential side CW.

[0068] Here, as shown in Figures 12 and 13, with respect to the first divided insulator 320A The second segment insulator 320B, located on one side CW in the circumferential direction, is provided with a guide groove 329 that guides the windings 350 extending from the first phase coil 35(U) and the second phase coil 35(V) to the first winding connection portion 722a of the first segment insulator 320A. The groove 329 extends circumferentially on one side L1 in the direction of the motor axis L of the outer peripheral portion 321. The groove 329 comprises a first wall portion 329a located radially inward, a second wall portion 329b located radially outward of the first wall portion 329a, and a bottom portion 329c connecting the first wall portion 329a and the second wall portion 329b. The bottom portion 329c is inclined toward one side L1 in the direction of the motor axis L, from one side CW in the circumferential direction toward the other side CCW. When viewed from a direction perpendicular to the motor axis L, the other end 329d of the CCW on the circumferential side of the bottom portion 329c overlaps with a part of the first winding connection portion 722a.

[0069] In this embodiment, the leg portion 725 constitutes the holding portion. As shown in Figures 12, 13, and 14, the leg portion 725 comprises a first leg portion 726 located on one side CW in the circumferential direction relative to the core connection portion 724, and a second leg portion 727 located on the other side CCW in the circumferential direction relative to the core connection portion 724. Corresponding to this configuration, the first segmented insulator 320A is provided with a first hole 326 into which the first leg portion 726 fits, and a second hole 327 located on the other side CCW in the circumferential direction relative to the first leg portion 726 into which the second leg portion 727 fits. In this embodiment, the first hole 326 is a press-fit hole into which the first leg portion 726 fits, and the second hole 327 is a guide hole into which the second leg portion 727 fits. Both leg portions 725 are rectangular bars with a square cross-section. However, in this embodiment, the first hole 326 has a circular cross-section, and the second hole 327 has a square cross-section.

[0070] Here, Figure 15 is a view of the insulator 32 shown in Figure 14, viewed from one side L1 in the direction of the motor axis L. As shown in Figure 15, the second hole 327 is provided with a positioning rib 324 that protrudes radially from the inner circumferential surface. In this embodiment, the positioning rib 324 includes a protruding first rib 324a that protrudes radially inward from the radially outer inner circumferential surface, and a second rib 324b that protrudes radially inward from the radially outer inner circumferential surface. The first rib 324a and the second rib 324b abut against the second leg portion 727 when the second leg portion 727 is fitted into the second hole 327, thereby positioning the second leg portion 727 radially.

[0071] As shown in Figures 12 and 13, the core connection portion 732 is electrically connected to the stator core 31. The core connection portion 732 is located between the first leg portion 726 and the second leg portion 727. The core connection portion 724 includes an extended portion 724a extending in the direction of the motor axis L, and a bent portion 724b extending radially outward from the other end L2 of the extended portion 724a on the motor axis L. Corresponding to this configuration, the outer peripheral portion 321 of the first segmented insulator 320A is provided with a notch portion 325 cut out radially inward. The notch portion 325 extends in the direction of the motor axis L. When the first leg portion 726 and the second leg portion 727 are held in the first hole 326 and the second hole 327, respectively, the core connection portion 724 is housed in the notch portion 325. With the common terminal 72 held by the first segmented insulator 320A, the bent portion 724b abuts against the stator core 31 and is fixed to the stator core 31 by welding. In this embodiment, the bent portion 724b and the stator core 31 are welded by laser. Also, as shown in Figure 12, when laser welding is performed, multiple weld marks 15 are formed spanning the bent portion 732b and the stator core 31.

[0072] (Effects and Benefits) In this embodiment, similar to Embodiment 1, the stator core 31 and the common terminal 72 (conductive terminal) are firmly fixed by welding, so that poor contact between the stator core 31 and the common terminal 72 due to motor vibrations, etc., can be suppressed. As a result, the stator core 31 and the ground of the substrate 19 are reliably electrically connected, so noise generated in the stator core 31 can be suppressed more reliably. Also, similar to Embodiment 1, the bent portion 724b is in contact with the stator core 31, so it is positioned in the direction of the motor axis L. In this state, the common terminal 72 can be fixed by welding.

[0073] In this embodiment, the first hole 326 is a press-fit hole into which the first leg portion 726 fits, and the second hole 327 is a guide hole into which the second leg portion 727 fits. Therefore, since the second hole 327 into which the second leg portion 727 of the two legs 725 fits is for guidance, it is easier to attach the common terminal 72 to the insulator 32 than when both legs are press-fitted.

[0074] In this embodiment, the second hole 327 is provided with a positioning rib 324 that protrudes radially from its inner circumferential surface. The positioning rib 324 comprises a protruding first rib 324a that protrudes radially inward from the radially outer inner circumferential surface, and a second rib 324b that protrudes radially inward from the radially outer inner circumferential surface. Therefore, when the second leg portion 727 is fitted into the second hole 327, the first rib 324a and the second rib 324b abut against the second leg portion 727, thereby enabling radial positioning of the second leg portion 727.

[0075] Furthermore, in this embodiment, the bent portion 724b extends radially outward from the other end L2 of the motor axis L of the extended portion 724a. The first split insulator 320A is provided with a notch 325 cut out in the direction of the motor axis L between the first hole 326 and the second hole 327. Therefore, the core connection portion 724 can be accommodated in the notch 325, so when the common terminal 72 is attached to the first split insulator 320A, it is possible to suppress an increase in the radial thickness of the first split insulator 320A and the common terminal 72. In addition, welding of the bent portion 724b and the stator core 31 can be performed from the radial outside, making the welding work easier.

[0076] In this embodiment, the conductive terminal includes a winding connection portion 722 that is bent to hold the ends 352 of the multiple windings 350 inward. That is, the conductive terminal can be a common terminal 72.

[0077] In this embodiment, the insulator 32 consists of multiple segmented insulators 320, each corresponding to one of the multiple salient poles 312. The common terminal 72 is held in one of the multiple segmented insulators 320, specifically the first segmented insulator 320A. Therefore, since the common terminal 72 is provided on one first segmented insulator 320A, the relative positional accuracy of the holes for fitting the legs 725 is high. For this reason, it is easy to attach the common terminal 72 to the insulator 32.

[0078] In this embodiment, among the multiple divided insulators 320, the second divided insulator 320B, located on one side CW in the circumferential direction relative to the first divided insulator 320A, is provided with a groove 329 that guides some of the windings 350. The bottom portion 329c of the groove 329 is inclined toward one side L1 in the direction of the motor axis L toward the other side CCW in the circumferential direction. When viewed from a direction perpendicular to the motor axis L, the end portion 329d of the bottom portion 329c on the other side CCW in the circumferential direction overlaps with a part of the first winding connection portion 722a. Therefore, when the windings 350 extending from the first phase coil 35(U) and the second phase coil 35(V) are guided from the groove 329 to the first winding connection portion 722a, they are at the same height as the first winding connection portion 722a, making it easy to connect the ends 352 of the windings 350 extending from the first phase coil 35(U) and the second phase coil 35(V) to the first winding connection portion 722a.

[0079] (Other embodiments) Figure 16 is a perspective view of the area around the common terminal 72 in a motor of another embodiment, viewed from the radial outside. As shown in Figure 16, in another embodiment, the first hole 326, which is a press-fit hole, penetrates in the direction of the motor axis L, and the stator core 31 may have a third hole 316 that overlaps with the first hole 326 in the direction of the motor axis L. In this case, the first leg portion 726 is through the third hole 3 It is press-fitted into 16. Therefore, the first leg portion 726 of the common terminal 72 is press-fitted into the third hole 316, making it difficult for the common terminal 72 to come loose from the insulator 32.

[0080] Furthermore, this technology can be configured as follows:

[0081] (1) A stator core with multiple salient poles arranged circumferentially around the motor axis, The insulator held in the stator core, A plurality of phase coils wound around the salient pole via the insulator, A substrate is electrically connected to a plurality of windings, each corresponding to the number of phases, extending from each of the plurality of phase coils, and is positioned on one side of the stator core in the axial direction along the motor axis, A conductive terminal electrically connects the substrate and the stator core, It has, The conductive terminal comprises a main body portion oriented radially toward the thickness direction, a substrate connection portion extending from the main body portion to one side in the axial direction and electrically connecting to the substrate, a core connection portion extending from the main body portion to the other side in the axial direction and electrically connecting to the stator core, and a holding portion held by the insulator. The motor is characterized in that the core connection portion is fixed to the stator core by welding.

[0082] (2) The core connection portion comprises an extended portion extending in the direction of the motor axis and a bent portion extending radially from the other end of the extended portion. The motor according to (1), characterized in that the bent portion abuts against the stator core and is fixed to the stator core by welding.

[0083] (3) The main body portion is plate-shaped and extends in the axial direction. The holding portion is the circumferential end portion of the main body, The motor according to (2), characterized in that the insulator has a retaining groove into which the retaining portion fits from the axial direction.

[0084] (4) The motor according to (3), characterized in that the retaining groove is provided with a positioning rib protruding from the inner circumferential surface.

[0085] (5) The bent portion extends radially outward from the other end of the extended portion, The motor according to any one of (4), characterized in that the insulator is provided with a notch cut out in the axial direction on the radially outer side of the retaining groove.

[0086] (6) The holding portion comprises a first leg portion located on one side in the circumferential direction relative to the core connection portion and protruding from the main body portion on the other side in the axial direction, and a second leg portion located on the other side in the circumferential direction relative to the core connection portion and protruding from the main body portion on the other side in the axial direction. The motor according to (2), characterized in that the insulator is provided with a first hole into which the first leg portion fits and a second hole into which the second leg portion fits.

[0087] (7) The motor according to (6), characterized in that one of the first hole and the second hole is a press-fit hole and the other is a guide hole.

[0088] (8) Both the first leg and the second leg are rectangular bars with a square cross-section. The aforementioned press-fit hole has a circular cross-section. The motor according to (7), characterized in that the guide hole has a square cross-section.

[0089] (9) The motor according to (8), characterized in that the guide hole is provided with a positioning rib that protrudes radially from the inner circumferential surface.

[0090] (10) The bent portion extends radially outward from the other end of the extended portion, The motor according to any one of (6) to (8), characterized in that the insulator is provided with a notch cut out in the axial direction between the first hole and the second hole.

[0091] (11) The motor according to any one of (6) to (10), characterized in that the conductive terminal has a winding connection portion that is bent to hold the ends of the plurality of windings inward.

[0092] (12) The winding connection portion comprises a first winding connection portion to which the ends of some of the windings reach from one side in the circumferential direction, and a second winding connection portion to which the ends of other some of the windings reach from the other side in the circumferential direction. The first winding connection portion is located on one side in the circumferential direction relative to the first leg portion, The motor according to any one of (6) to (11), characterized in that the second winding connection portion is located on the other side in the circumferential direction relative to the second leg portion.

[0093] (13) The insulator consists of a plurality of segmented insulators provided corresponding to each of the plurality of salient poles, The motor according to (12), characterized in that the conductive terminal is held by one of the plurality of divided insulators, a first divided insulator.

[0094] (14) Of the plurality of divided insulators, the second divided insulator located on one side in the circumferential direction relative to the first divided insulator is provided with a groove for guiding some of the plurality of windings. The groove comprises a first wall portion located radially inward, a second wall portion located radially outward relative to the first wall portion, and a bottom portion connecting the first wall portion and the second wall portion. The bottom portion is inclined toward one side in the axial direction toward the other side in the circumferential direction, The motor according to (13), characterized in that, when viewed from a direction perpendicular to the axis, the other end of the bottom in the circumferential direction overlaps with a part of the first winding connection portion.

[0095] (15) The aforementioned press-fit hole penetrates in the axial direction, The stator core has a third hole in the axial direction that overlaps with one of the press-fit holes, The motor according to (7) or (8), characterized in that one of the first leg portion and the second leg portion that fits into the press-fit hole is press-fitted into the third hole.

[0096] (16) A motor described in any one of items (1) to (16), A pump device characterized by having an impeller that is rotationally driven by the motor. [Explanation of symbols]

[0097] 1...Pump device, 2...Case, 3...Stator, 4...Rotor, 5...Support shaft, 6...Housing, 10...Motor, 11...Radial bearing, 12...Thrust bearing, 15...Weld marks, 18...Cover, 19...Base plate, 20...Pump chamber, 21...Suction pipe, 21a...Suction port, 22...Discharge pipe, 22a...Discharge port, 23...Side wall, 25...Impeller, 26...Disc, 27...Support part, 28...Cylindrical part, 29...Side wall, 31...Stator core, 32,33...Insulator, 35...Coil, 40...Cylindrical part, 45...Flange part, 47...Magnet, 51 ...First end, 52...Second end, 60...Resin sealing member, 61...First partition, 62...Second partition, 63...Bottom wall, 64...End, 65...Shaft hole, 66...Body, 67...First cylindrical part, 68...Second cylindrical part, 69...Connector housing, 71...Winding terminal, 72...Common terminal, 73...Conductive terminal, 75...Connector terminal, 91...First screw, 92...Second screw, 97...First fixing part, 98...Second fixing part, 191...First connection part, 192...Second connection part, 193...Third connection part, 194...Fourth connection part, 197...Notch, 198...Cut Notch, 260...Central hole, 261...Wing section, 280...Receiving section, 310...Welded section, 311...Ring section, 312...Sailing pole, 315...Recess, 316...Third hole, 320, 330...Split insulator, 320A...First split insulator, 320B...Second split insulator, 321...Outer circumference section, 322...Inner circumference section, 324...Positioning rib, 325...Notch section, 326...First hole, 327...Second hole, 328...Retaining groove, 328a...Notch section, 328b...Positioning rib, 329...Groove section, 329a...First wall section , 329b...Second wall section, 329c...Bottom section, 329d...End section, 350...Winding section, 351...End section, 352...End section, 711...Substrate connection section, 720...Main body section, 721...Substrate connection section, 721a...Straight section, 721b...Elastic section, 722...Winding connection section, 722a...First winding connection section, 722b...Second winding connection section, 724...Core connection section, 725...Legs, 726...First leg section, 727...Second leg section, 730...Main body section, 731...Substrate connection section, 732...Core connection section, 732a...Extended section, 732b...Bending section, 733...Holding section

Claims

1. A stator core with multiple salient poles arranged circumferentially around the motor axis, The insulator held in the stator core, A plurality of phase coils wound around the salient pole via the insulator, A substrate is electrically connected to a plurality of windings, each corresponding to the number of phases, extending from each of the plurality of phase coils, and is positioned on one side of the stator core in the axial direction along the motor axis, A conductive terminal electrically connects the substrate and the stator core, It has, The conductive terminal comprises a main body portion oriented radially toward the thickness direction, a substrate connection portion extending from the main body portion to one side in the axial direction and electrically connecting to the substrate, a core connection portion extending from the main body portion to the other side in the axial direction and electrically connecting to the stator core, and a holding portion held by the insulator. The core connection portion is fixed to the stator core by welding. The core connection portion comprises an extended portion extending in the direction of the motor axis and a bent portion extending radially from the other end of the extended portion. The motor is characterized in that the bent portion abuts against the stator core and is fixed to the stator core by welding.

2. The main body portion is plate-shaped and extends in the axial direction. The holding portion is the circumferential end portion of the main body, The motor according to claim 1, characterized in that the insulator has a retaining groove into which the retaining portion fits from the axial direction.

3. The motor according to claim 2, characterized in that the retaining groove is provided with a positioning rib protruding from the inner circumferential surface.

4. The bent portion extends radially outward from the other end of the extended portion, The motor according to claim 2, characterized in that the insulator is provided with a notch cut out in the axial direction on the radially outer side of the retaining groove.

5. The holding portion comprises a first leg portion located on one side in the circumferential direction relative to the core connection portion and protruding from the main body portion on the other side in the axial direction, and a second leg portion located on the other side in the circumferential direction relative to the core connection portion and protruding from the main body portion on the other side in the axial direction. The motor according to claim 1, characterized in that the insulator is provided with a first hole into which the first leg portion fits and a second hole into which the second leg portion fits.

6. The motor according to claim 5, characterized in that one of the first hole and the second hole is a press-fit hole and the other is a guide hole.

7. Both the first leg and the second leg are rectangular bars with a square cross-section. The aforementioned press-fit hole has a circular cross-section. The motor according to claim 6, characterized in that the guide hole has a square cross-sectional shape.

8. The motor according to claim 7, characterized in that the guide hole is provided with a positioning rib that protrudes radially from the inner circumferential surface.

9. The bent portion extends radially outward from the other end of the extended portion, The motor according to claim 5, characterized in that the insulator is provided with a notch cut out in the axial direction between the first hole and the second hole.

10. The motor according to claim 5, characterized in that the conductive terminal has a winding connection portion that is bent to hold the ends of the plurality of windings inward.

11. The winding connection portion comprises a first winding connection portion to which the ends of some of the windings reach from one side in the circumferential direction, and a second winding connection portion to which the ends of other some of the windings reach from the other side in the circumferential direction. The first winding connection portion is located on one side in the circumferential direction relative to the first leg portion, The motor according to claim 10, wherein the second winding connection portion is located on the other side in the circumferential direction relative to the second leg portion.

12. The insulator consists of a plurality of segmented insulators provided corresponding to each of the plurality of salient poles, The motor according to claim 11, characterized in that the conductive terminal is held by one of the plurality of divided insulators, specifically a first divided insulator.

13. Of the plurality of divided insulators, the second divided insulator located on one side in the circumferential direction relative to the first divided insulator is provided with a groove for guiding some of the plurality of windings. The groove comprises a first wall portion located radially inward, a second wall portion located radially outward relative to the first wall portion, and a bottom portion connecting the first wall portion and the second wall portion. The bottom portion is inclined toward one side in the axial direction toward the other side in the circumferential direction, The motor according to claim 12, characterized in that, when viewed from a direction perpendicular to the axis, the other end of the bottom in the circumferential direction overlaps with a part of the first winding connection portion.

14. The aforementioned press-fit hole penetrates in the axial direction, The stator core has a third hole in the axial direction that overlaps with one of the press-fit holes, The motor according to claim 6, characterized in that one of the first leg portion and the second leg portion that fits into the press-fit hole is press-fitted into the third hole.

15. A motor according to any one of claims 1 to 14, A pump device characterized by having an impeller that is rotationally driven by the motor.

Images