Motor and pump device
By fixing the conductive terminals radially outside the outer circumference of the motor core and adjusting their position to increase the welding area and strength, the problem of poor contact between the conductive terminals and the core in the prior art is solved, and a more stable electrical connection and more reliable motor operation is achieved.
Patent Information
- Application Number
- JP2023175132
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-10-10
- Publication Date
- 2025-04-22
AI Technical Summary
In the prior art, the welding area between the conductive terminal of the motor and the motor core is small, resulting in insufficient welding strength and is easily crushed during the sealant packaging process, resulting in poor contact between the conductive terminal and the core, affecting the normal operation of the motor.
Fix the conductive terminal to the radially outside the outer circumference of the motor core by welding, the welding area is increased to increase the welding strength, and the position of the conductive terminal is adjusted so that it completely covers the outer circumference of the core in the axial direction, thereby further increasing the welding area.
By increasing the welding area and strength, stable contact between the conductive terminal and the core is ensured, and even during the sealant packaging process, poor contact problems can be effectively avoided and the normal operation of the motor can be ensured.
Smart Images
Figure 2025065734000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a motor and a pump device in which a stator core is covered with a resin sealing member. [Background technology]
[0002] A motor in which a stator core is covered with a resin sealing member is described in Patent Document 1. The motor in this document includes a stator core with multiple salient poles arranged in a circumferential direction centered on the motor axis, an insulator held by the stator core, multiple phase coils wound around the salient poles via the insulator, multiple winding terminals to which windings extending from each of the coils are connected and connected to a circuit board, a conductive terminal that electrically connects the ground of the circuit board and the stator core, and a resin sealing member that covers the stator core. The conductive terminal is held by the insulator and contacts an end face of the stator core facing one side of the motor axis. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] China Utility Model Registration Publication No. 211950892 Summary of the Invention [Problem to be solved by the invention]
[0004] In Patent Document 1, the end of the conductive terminal is fixed to the end face of the stator core by welding. The resin sealing member is formed by placing the stator core with the conductive terminal fixed to the end face of the stator core by welding into a mold and injecting resin into the mold. Here, in the technology of Patent Document 1, the area where the end of the conductive terminal and the end face of the stator core can be welded tends to be small, so the welding strength between the conductive terminal and the stator core may be weak. For this reason, when forming the resin sealing member, the pressure of the resin injected into the mold may destroy the welded portion between the end of the conductive terminal and the end face of the stator core, resulting in poor contact between the conductive terminal and the stator core, and there is a possibility that the stator core and the circuit board will not be in a conductive state.
[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 poor contact between the conductive terminals and the stator core even when the stator core is covered with a resin sealing member. [Means for solving the problem]
[0006] In order to solve the above problem, a motor of the present invention includes a stator core consisting of multiple cores arranged in a ring shape in a circumferential direction around a motor axis, an insulator held by the stator core, multiple phase coils wound around multiple cores via the insulator, the multiple phase coils including a first phase coil, a second phase coil and a third phase coil, a resin sealing member covering the stator core, the insulator and the multiple phase coils, a circuit board electrically connected to multiple windings extended from each of the multiple phase coils and arranged on one side of the stator core in an axial direction along the motor axis, and a conductive terminal electrically connecting the ground of the circuit board to the stator core, wherein the core has an arc portion curved in a circumferential direction and a salient pole protruding radially inward from the arc portion, and the conductive terminal is fixed by welding to an outer peripheral surface on the radially outer side of the arc portion.
[0007] According to the present invention, the conductive terminal is fixed to the outer peripheral surface of the arc portion on the radially outer side by welding. Therefore, if the portion that can be welded is the outer peripheral surface of the stator core, the conductive terminal and the stator core Since the area where welding to the conductive terminal can be performed can be increased, the welding strength between the conductive terminal and the stator core can be improved. As a result, even if the stator core is covered with a resin sealing member, poor contact between the conductive terminal and the stator core can be suppressed.
[0008] In the present invention, when viewed from a direction perpendicular to the axial direction, it is preferable that the conductive terminal overlaps with the outer peripheral surface of the arc portion from the other end to the one end in the axial direction. In this way, the conductive terminal completely overlaps with the outer peripheral surface in the axial direction, so that the area in which the conductive terminal and the stator core can be welded can be made larger. This can further improve the welding strength between the conductive terminal and the stator core.
[0009] In the present invention, the stator core is preferably such that a plurality of the cores are integrally connected, a first core arranged at one end of the stator core and a second core arranged at the other end of the stator core are adjacent to each other, and the plurality of cores are arranged in a ring shape, and the conductive terminal is arranged at the boundary between the outer circumferential surface of the first core and the outer circumferential surface of the second core, and is fixed to the outer circumferential surface of the first core and the outer circumferential surface of the second core by welding. In this way, in a stator core in which the stator core is curved in a ring shape to fix the first core and the second core, the first core and the second core can be fixed via the conductive terminal. Here, when the first core and the second core are fixed without the conductive terminal, the boundary between the outer circumferential surface of the first core and the outer circumferential surface of the second core is welded. Therefore, compared to the case in which the first core and the second core are fixed without the conductive terminal, according to the present invention, the first core and the second core are fixed via the conductive terminal, so that the area in which the first core and the second core can be welded can be increased. This can improve the welding strength between the first core and the second core.
[0010] In the present invention, it is preferable that the first core and the second core are fixed to each other by welding, which can further improve the welding strength between the first core and the second core.
[0011] In the present invention, the coil includes a common terminal to which a first end of each of the windings extended from each of the first phase coil, the second phase coil, and the third phase coil is electrically connected and which is electrically connected to the circuit board, and a first winding terminal to which a second end of the winding extended from any of the first phase coil, the second phase coil, and the third phase coil is electrically connected and which is electrically connected to the circuit board, and the insulator includes a plurality of split insulators provided corresponding to each of the plurality of salient poles, the common terminal is held by the split insulator held by one of the first core and the second core, and the first winding terminal is held by the split insulator held by the other of the first core and the second core. In this way, the first winding terminal, the conductive terminal, and the common terminal can be adjacent to each other in the circumferential direction, so that the regions of the circuit board connected to the first winding terminal, the conductive terminal, and the common terminal can be close to each other. This makes it easier to perform wiring on the circuit board.
[0012] In the present invention, it is preferable that the conductive terminal has a plate shape with a plate thickness direction oriented in a radial direction and extending in the axial direction, and includes a main body portion welded to the outer circumferential surface. In this way, since the main body portion is plate-shaped, it is easy to weld the conductive terminal to the outer circumferential surface of the stator core.
[0013] A pump device of the present invention includes the above-mentioned motor and an impeller that is rotationally driven by the motor. Effect of the Invention
[0014] According to the present invention, the conductive terminal is fixed to the outer peripheral surface on the radially outer side of the arc portion by welding, so that poor contact between the conductive terminal and the stator core can be suppressed even when the stator core is covered with a resin sealing member. [Brief description of the drawings]
[0015] [Figure 1] 1 is a perspective view showing an embodiment of a pump device and a motor to which the present invention is applied; [Diagram 2] FIG. 2 is a vertical sectional view of the pump device and the motor shown in FIG. [Diagram 3] 2 is an exploded perspective view showing a state in which a cover is removed from the pump device shown in FIG. 1. [Figure 4] 4 is an exploded perspective view showing a state in which a circuit board is removed from the state shown in FIG. 3. FIG. [Diagram 5] 2 is an exploded perspective view showing a state in which a housing and a stator are separated in the motor shown in FIG. 1. FIG. [Figure 6] FIG. [Figure 7] 1 is a perspective view of a conductive terminal disassembled from a stator core. [Figure 8] 6 is a view of the vicinity of the conductive terminal shown in FIG. 5 as viewed from the radially outer side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0016] Hereinafter, a motor and a pump device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the axial direction means a direction along the motor axis L, the radial direction on the radially inner side and the radially outer side means a radial direction centered on the motor axis L, and the circumferential direction means a rotation direction centered on the motor axis L.
[0017] (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 cross-sectional view of the pump device 1 and the motor 10 shown in FIG. 1. In FIG. 1 and FIG. 2, the pump device 1 has a case 2, a motor 10 arranged on one side L1 in the axial direction of the case 2, and an impeller 25 arranged in a pump chamber 20 inside the case 2. The impeller 25 is driven to rotate around the motor axis L by the motor 10. The motor 10 includes a cylindrical stator 3, a rotor 4 arranged inside the stator 3, a resin housing 6 that covers the stator 3, and a round bar-shaped support shaft 5 that rotatably supports the rotor 4. The support shaft 5 is made of metal or ceramic. In the pump device 1 of this embodiment, the fluid is liquid, and the pump device 1 is used as an in-vehicle pump in which the environmental temperature and the fluid temperature are likely to change.
[0018] The case 2 is fixed to the other side L2 of the motor 10 and forms a pump chamber 20. The case 2 includes a suction pipe 21 extending along the motor axis L and a discharge pipe 22 extending in a direction perpendicular to the motor axis L. The suction pipe 21 includes a suction port 21a. The discharge pipe 22 includes a discharge port 22a. The suction pipe 21 is provided concentrically with the motor axis L.
[0019] The stator 3 includes a stator core 31, insulators 32, 33 held by the stator core 31, and a coil 35 wound around the stator core 31 with the insulators 32, 33 interposed therebetween.
[0020] The rotor 4 includes a cylindrical portion 40 that extends in the axial direction from a position facing the stator 3 on the radial inside to the pump chamber 20. The cylindrical portion 40 opens at the pump chamber 20. A cylindrical magnet 47 is held on the outer circumferential surface of the cylindrical portion 40 and faces the stator 3 on the radial inside. The magnet 47 is, for example, a neodymium bonded magnet.
[0021] A disk-shaped flange portion 45 is formed at the end of the cylindrical portion 40 on the other side L2 in the axial direction. The impeller 25 is fixed to the flange portion 45. 2, a central hole 250 is formed. Impeller 25 has a plurality of blade portions 251 formed at equal angular intervals, which extend radially outward while curving in an arc from the periphery of central hole 250. Impeller 25 is fixed to flange portion 45 via blade portions 251.
[0022] A cylindrical radial bearing 11 is held on the radial inside of the cylindrical portion 40. The rotor 4 is rotatably supported by the support shaft 5 via the radial bearing 11. A first end 51 on one side L1 in the axial direction of the support shaft 5 is held in a shaft hole 65 formed in a bottom wall 63 of the housing 6. An annular thrust bearing 12 is attached to a second end 52 of the support shaft 5. The thrust bearing 12 is disposed between the radial bearing 11 and a cylindrical portion 28 provided in the case 2. This restricts the thrust bearing 12 from moving in the axial direction. Here, at least a part of the first end 51 and the shaft hole 65 is formed to have a D-shaped cross section, and the second end 52 of the support shaft 5 and the hole of the thrust bearing 12 are formed to have a D-shaped cross section. Thus, the support shaft 5 and the thrust bearing 12 are prevented from rotating.
[0023] The housing 6 includes a first partition 61 facing the pump chamber 20, a second partition 62 interposed between the stator 3 and the magnet 47, and a cylindrical body 66 covering the stator 3 from the radial outside. Thus, the housing 6 is a resin sealing member 60 covering the stator 3 from both radial and axial sides. The resin sealing member 60 is a resin portion formed when the stator 3 is insert molded using polyphenylene sulfide (PPS) or the like. The resin sealing member 60 may be formed by insert molding the stator 3 using Bulk Molding Compound (BMC) or the like.
[0024] (Detailed configuration of motor 10) Fig. 3 is an exploded perspective view showing a state in which the cover 18 is removed from the pump device 1 shown in Fig. 1. Fig. 4 is an exploded perspective view showing a state in which the circuit board 19 is removed from the state shown in Fig. 3. Fig. 5 is an exploded perspective view showing a state in which the housing 6 and the stator 3 are disassembled in the motor 10 shown in Fig. 1. Fig. 6 is a plan view of the stator core 31. Fig. 7 is a perspective view in which the conductive terminal 73 is disassembled from the stator core 31. Fig. 8 is a view of the vicinity of the conductive terminal shown in Fig. 5 as viewed from the radial outside.
[0025] 2, 3, and 4, a cover 18 is fixed to an end portion 64 on one side L1 in the axial direction of the housing 6 from one side L1 of the motor axis L. Between the cover 18 and a bottom wall 63 of the housing 6, a circuit board 19 is arranged on which a circuit for controlling the power supply to the coil 35 and the like are provided.
[0026] The circuit board 19 is fixed to the housing 6 by a first fixing portion 97 using a first screw 91 and a second fixing portion 98 using a second screw 92. The housing 6 is formed with a first cylindrical portion 67 protruding from the bottom wall 63 toward one side L1 in the axial direction. The first fixing portion 97 is configured by fastening the first screw 91 to the first cylindrical portion 67 through a notch 197 formed on the edge of the circuit board 19. The housing 6 is also formed with a second cylindrical portion 68 protruding from the bottom wall 63 toward one side L1 in the axial direction. The second fixing portion 98 is configured by fastening the second screw 92 to the second cylindrical portion 68 through a notch 198 formed on the edge of the circuit board 19.
[0027] 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 connected by solder to a metallic winding terminal 71 that penetrates the bottom wall 63 of the housing 6 from the stator 3 and protrudes to one side L1 in the axial direction. The second connection part 192 is connected to a metallic common terminal 72 that penetrates the bottom wall 63 of the housing 6 from the stator 3 and protrudes to one side L1 in the axial direction. The connection is made by soldering. The third connection portion 193 is connected by soldering to a metallic conductive terminal 73 that penetrates the bottom wall 63 of the housing 6 from the stator 3 and protrudes to one side L1 in the axial direction. The fourth connection portion 194 is connected by soldering to a metallic connector terminal 75 held by the housing 6. The circuit board 19 is provided with wiring and the like that electrically connects the first connection portion 191, the second connection portion 192, the third connection portion 193 and the plurality of fourth connection portions 194 via a drive circuit and the like mounted on the circuit board 19.
[0028] A cylindrical connector housing 69 is formed in the housing 6. 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 fourth connection portion 194. 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, and the rotor 4 rotates around the motor axis L. As a result, the impeller 25 rotates in the pump chamber 20 and the inside of the pump chamber 20 becomes negative pressure, so that the fluid is sucked from the suction pipe 21 into the pump chamber 20 and discharged from the discharge pipe 22.
[0029] As shown in FIG. 6, the stator core 31 is composed of a plurality of cores 310 arranged in a ring shape in the circumferential direction centered on the motor axis L. In this embodiment, the number of cores 310 is nine. The stator core 31 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. In this embodiment, the stator core 31 has a plurality of cores 310 integrally connected to each other. Among the plurality of cores 310, a first core 310A arranged at one end of the stator core 31 and a second core 310B arranged at the other end are bent so as to be adjacent to each other, so that the plurality of cores 310 are arranged in a ring shape. In this embodiment, the first core 310A and the second core 310B are fixed by welding. In this embodiment, the first core 310A and the second core 310B are welded by a laser. As a result, a plurality of weld marks 15 are formed so as to straddle the first core 310A and the second core 310B, as shown in FIG. 7. 2, 5 and 6, the core 310 includes an arc portion 311 curved in a circumferential direction, and salient poles 312 protruding radially inward from the arc portion 311. Adjacent salient poles 312 are arranged at a constant pitch in the circumferential direction.
[0030] The insulators 32, 33 overlap the stator core 31 from both sides in the axial direction and cover each of the multiple salient poles 312. In this embodiment, the insulators 32, 33 are composed of multiple split insulators 320, 330 split 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 arc portion 311 of the stator core 31 from the axial direction, an inner peripheral portion 322, 332 that protrudes in the axial direction at the radially inner end of the salient pole 312, and a cylindrical portion forming portion that connects the outer peripheral portion 321, 331 and the inner peripheral portion 322, 332. The coil 35 is wound around the salient pole 312 via the cylindrical portion forming portion.
[0031] The motor 10 is a three-phase motor. Therefore, as shown in Fig. 6, the coils 35 are arranged in the order of a first-phase coil 35(U) consisting of a U-phase coil, a second-phase coil 35(V) consisting of a V-phase coil, and a third-phase coil 35(W) consisting of a W-phase coil. In this embodiment, three coils 35(U), three coils 35(V), and three coils 35(W) are arranged, and the total number of coils 35 is nine. Therefore, nine split insulators 320, 330 are arranged in total.
[0032] In this embodiment, the first-phase coil 35(U) is formed of a single winding 350. Therefore, the three first-phase coils 35(U) are electrically connected in series, as are the second-phase coils 35(V) and the third-phase coils 35(W).
[0033] As shown in Fig. 5 and Fig. 7, among the nine split insulators 320, a winding terminal 71 is held on an 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). A common terminal 72 is held on an outer peripheral portion 321 of one of the split insulators 320 not provided with a winding terminal 71. The common terminal 72 is electrically connected to a first end 351 of each of the windings 350 extending from each of the coils 35 of the multiple phases. The three winding terminals 71 are connected to second ends 352 of the windings 350 extending from the three coils 35.
[0034] The winding terminal 71 protrudes from the split insulator 320 toward one side L1 in the axial direction. A circuit board connection portion 711, which is a tip portion of the winding terminal 71, is connected to a first connection portion 191 of the circuit board 19 shown in Fig. 2, Fig. 3, and Fig. 4. As shown in Fig. 4, the circuit board connection portion 711 protrudes from the bottom wall 63 of the resin sealing member 60 toward one side L1 in the axial direction and is exposed. Here, the winding terminal (first winding terminal) 71(W) is held by the split insulator 320 held by the second core 310B.
[0035] The common terminal 72 is held by a split insulator 320 held by the first core 310A. The common terminal 72 protrudes from the split insulator 320 toward one side L1 in the axial direction. A circuit board connection portion 721, which is a tip portion of the common terminal 72, is connected to the second connection portion 192 of the circuit board 19 shown in Figures 2, 3, and 4. As shown in Figure 4, the circuit board connection portion 721 protrudes from the bottom wall 63 of the resin sealing member 60 toward one side L1 in the axial direction and is exposed.
[0036] The conductive terminal 73 electrically connects the ground of the circuit board 19 to the stator core 31. As shown in Fig. 5 to Fig. 8, the conductive terminal 73 has a plate shape with its plate thickness direction facing the radial direction and extending in the axial direction, and includes a main body portion 732 welded to the outer circumferential surface 313, and a circuit board connection portion 731 protruding from the main body portion 732 to one side L1 in the axial direction. As shown in Fig. 8, when viewed from a direction perpendicular to the axial direction, the main body portion 732 overlaps with the outer circumferential surface 313 from an end portion 314 on the other side L2 in the axial direction of the outer circumferential surface 313 of the arc portion 311 to an end portion 315 on one side L1.
[0037] As shown in Figs. 5 to 8, the conductive terminal 73 is fixed to the outer peripheral surface 313 on the radially outer side of the arc portion 311 by welding. In this embodiment, the conductive terminal 73 is disposed at a boundary B between the outer peripheral surface 313A of the first core 310A and the outer peripheral surface 313B of the second core 310B, and is fixed to the outer peripheral surface 313A of the first core 310A and the outer peripheral surface 313B of the second core 310B by welding. The conductive terminal 73 and the outer peripheral surfaces 313A and 313B are welded by a laser. As a result, as shown in Fig. 8, a plurality of weld marks 16 are formed so as to straddle the conductive terminal 73 and the outer peripheral surfaces 313A and 313B.
[0038] 8, the winding terminal (first winding terminal) 71(W) is adjacent to one circumferential side R1 of the conductive terminal 73. The common terminal 72 is adjacent to the conductive terminal 73 on the other circumferential side R2.
[0039] (Action and effect) According to this embodiment, the conductive terminal 73 is fixed by welding to the outer peripheral surface 313 on the radially outer side of the arc portion 311. Therefore, by making the outer peripheral surface 313 of the stator core 31 the portion that can be welded, the area where the conductive terminal 73 and the stator core 31 can be welded can be increased, and the welding strength between the conductive terminal 73 and the stator core 31 can be improved. As a result, even if the stator core 31 is covered with the resin sealing member 60, the conductive terminal 73 and the stator core 31 can be welded to each other. Poor contact with the accelerating core 31 can be suppressed.
[0040] When viewed from a direction perpendicular to the axial direction, it is preferable that the conductive terminal 73 overlaps with the outer circumferential surface 313 from the end 314 on the other side L2 in the axial direction of the outer circumferential surface 313 of the arc portion 311 to the end 315 on the one side L1. In this way, the conductive terminal 73 completely overlaps with the outer circumferential surface 313 in the axial direction, so that the area in which the conductive terminal 73 and the stator core 31 can be welded can be made larger. This can further improve the welding strength between the conductive terminal 73 and the stator core 31.
[0041] The stator core 31 has a plurality of cores 310 integrally connected. Among the plurality of cores 310, the first core 310A arranged at one end of the stator core 31 and the second core 310B arranged at the other end are adjacent to each other, so that the plurality of cores 310 are arranged in a ring shape. The conductive terminal 73 is arranged at the boundary B between the outer circumferential surface 313A of the first core 310A and the outer circumferential surface 313B of the second core 310B. The conductive terminal 73 is fixed to the outer circumferential surface 313A of the first core 310A and the outer circumferential surface 313B of the second core 310B by welding. In this way, the stator core 31 can be curved in a ring shape to fix the first core 310A and the second core 310B, and the first core 310A and the second core 310B can be fixed to each other via the conductive terminal 73 in the stator core 31 that fixes the first core 310A and the second core 310B. Therefore, compared to the case where the first core 310A and the second core 310B are fixed together without the conductive terminal 73, according to this embodiment, the first core 310A and the second core 310B are fixed together via the conductive terminal 73, so that the area where the first core 310A and the second core 310B can be welded can be increased. This can improve the welding strength between the first core 310A and the second core 310B.
[0042] First core 310A and second core 310B are fixed to each other by welding, which can further improve the welding strength between first core 310A and second core 310B.
[0043] The motor 10 has a common terminal 72 to which a first end 351 of each of the windings 350 extending from each of the first phase coil 35(U), the second phase coil 35(V), and the third phase coil 35(W) is electrically connected and which is electrically connected to the circuit board 19, and a winding terminal (first winding terminal) 71(W) to which a second end 352 of the winding 350 extending from any of the coils 30 of the first phase coil 35(U), the second phase coil 35(V), and the third phase coil 35(W) is electrically connected and which is electrically connected to the circuit board 19. The insulator 32 includes a plurality of split insulators 320 provided corresponding to each of the plurality of salient poles. The common terminal 72 is held by the split insulator 320 held by the second core 310B. The winding terminal 71(W) is held by a split insulator 320 held by the first core 310A. In this manner, the winding terminal 71(W), the conductive terminal 73, and the common terminal 72 can be adjacent to each other in the circumferential direction, so that the regions of the circuit board 19 where the winding terminal 71(W), the conductive terminal 73, and the common terminal 72 are connected can be close to each other. This makes it easier to perform wiring on the circuit board 19.
[0044] The conductive terminal 73 has a plate shape with its thickness direction facing the radial direction and extending in the axial direction, and includes a main body 732 welded to the outer circumferential surface 313. In this way, since the main body 732 has a plate shape, it is easy to weld the conductive terminal 73 to the outer circumferential surface 313 of the stator core 31.
[0045] The present technology can be configured as follows.
[0046] (1) a stator core including a plurality of cores arranged in an annular shape in a circumferential direction around a motor axis; an insulator held by the stator core; a plurality of coils for different phases wound around a plurality of the cores via the insulators, the plurality of coils including a first phase coil, a second phase coil, and a third phase coil; a resin sealing member that covers the stator core, the insulator, and the coils of the multiple phases; a circuit board electrically connected to a plurality of windings extending from each of the coils for each of the plurality of phases, the circuit board being disposed on one side of the stator core in an axial direction along the motor axis; a conductive terminal that electrically connects the ground of the circuit board and the stator core; having The core includes an arc portion curved in a circumferential direction and a salient pole protruding radially inward from the arc portion, The motor is characterized in that the conductive terminal is fixed to an outer peripheral surface of the arc portion on the radially outer side by welding.
[0047] (2) The motor described in (1), characterized in that when viewed from a direction perpendicular to the axial direction, the conductive terminal overlaps the outer peripheral surface of the arc portion from the other end of the outer peripheral surface in the axial direction to the one end of the outer peripheral surface.
[0048] (3) The stator core is formed by integrally connecting a plurality of the cores, Among the plurality of cores, a first core arranged at one end of the stator core and a second core arranged at the other end of the stator core are adjacent to each other, so that the plurality of cores are arranged in an annular shape; The motor described in (1) or (2), characterized in that the conductive terminal is arranged at the boundary between the outer circumferential surface of the first core and the outer circumferential surface of the second core, and is fixed to the outer circumferential surface of the first core and the outer circumferential surface of the second core by welding.
[0049] (4) The motor according to (3), wherein the first core and the second core are fixed to each other by welding.
[0050] (5) a common terminal to which a first end of each of the windings extended from each of the first phase coil, the second phase coil, and the third phase coil is electrically connected and which is electrically connected to the circuit board; a first winding terminal to which a second end of a winding extended from any one of the first phase coil, the second phase coil, and the third phase coil is electrically connected and which is electrically connected to the circuit board; having the insulator includes a plurality of split insulators provided corresponding to the plurality of salient poles, the common terminal is held by the split insulator that is held by one of the first core and the second core, The motor according to (3) or (4), wherein the first winding terminal is held by the split insulator that is held by the other of the first core and the second core.
[0051] (6) The conductive terminal is a plate-shaped terminal extending in the axial direction and having a plate thickness direction in the radial direction, and includes a main body portion welded to the outer circumferential surface. The motor according to any one of claims 1 to 5.
[0052] (7) A motor according to any one of (1) to (6), an impeller that is rotated by the motor; A pump device comprising: [Explanation of symbols]
[0053] 1...pump device, 2...case, 3...stator, 4...rotor, 5...support shaft, 6...housing, 10...motor, 11...radial bearing, 12...thrust bearing, 15...welding mark, 16...welding mark, 18...cover, 19...circuit board, 20...pump chamber, 21...suction pipe, 21a...suction port, 22...discharge pipe, 22a...discharge port, 25...impeller, 28...tubular portion, 30...coil, 31... stator core, 32, 33... insulator, 35... coil, 40... cylindrical portion, 45... flange portion, 47... magnet, 51... first end portion, 52... second end portion, 60... resin sealing member, 61... first partition wall portion, 62... second partition wall portion, 63... bottom wall, 64... end portion, 65... shaft hole, 66... body portion, 67... first cylindrical portion, 68... second cylindrical portion, 69... connector housing, 71... winding Line terminal, 72...common terminal, 73...conduction terminal, 75...connector terminal, 91...first screw, 92...second screw, 97...first fixing portion, 98...second fixing portion, 191...first connection portion, 192...second connection portion, 193...third connection portion, 194...fourth connection portion, 250...center hole, 251...wing portion, 310...core, 310A...first core, 310B...second core, 311...arc portion , 312... salient pole, 313, 313A, 313B... outer peripheral surface, 314... end portion, 315... end portion, 320... split insulator, 321... outer peripheral portion, 322... inner peripheral portion, 350... winding, 351... first end portion, 352... second end portion, 711... circuit board connection portion, 721... circuit board connection portion, 731... circuit board connection portion, 732... main body portion, B... boundary, L... motor axis.
Claims
1. a stator core including a plurality of cores arranged in an annular shape in a circumferential direction around a motor axis; an insulator held by the stator core; a plurality of phase coils wound around the plurality of cores via the insulators, the plurality of phase coils including a first phase coil, a second phase coil, and a third phase coil; a resin sealing member that covers the stator core, the insulator, and the coils of the multiple phases; a circuit board electrically connected to a plurality of windings extending from each of the coils for each of the plurality of phases, the circuit board being disposed on one side of the stator core in an axial direction along the motor axis; a conductive terminal that electrically connects the ground of the circuit board and the stator core; having The core includes an arc portion curved in a circumferential direction and a salient pole protruding radially inward from the arc portion, The motor is characterized in that the conductive terminal is fixed to an outer peripheral surface of the arc portion on the radially outer side by welding.
2. The motor according to claim 1, characterized in that, when viewed from a direction perpendicular to the axial direction, the conductive terminal overlaps with the outer peripheral surface of the arc portion from the other end of the outer peripheral surface in the axial direction to the one end of the outer peripheral surface.
3. The stator core is formed by integrally connecting a plurality of the cores, Among the plurality of cores, a first core arranged at one end of the stator core and a second core arranged at the other end of the stator core are adjacent to each other, so that the plurality of cores are arranged in an annular shape; The motor according to claim 1 or 2, characterized in that the conductive terminal is arranged at the boundary between the outer circumferential surface of the first core and the outer circumferential surface of the second core, and is fixed to the outer circumferential surface of the first core and the outer circumferential surface of the second core by welding.
4. The motor according to claim 3 , wherein the first core and the second core are fixed to each other by welding.
5. a common terminal to which a first end of each of the windings extended from each of the first phase coil, the second phase coil, and the third phase coil is electrically connected and which is electrically connected to the circuit board; a first winding terminal to which a second end of a winding extended from any one of the first phase coil, the second phase coil, and the third phase coil is electrically connected and which is electrically connected to the circuit board; having the insulator includes a plurality of split insulators provided corresponding to the plurality of salient poles, the common terminal is held by the split insulator that is held by one of the first core and the second core, 4. The motor according to claim 3, wherein the first winding terminal is held by the split insulator that is held by the other of the first core and the second core.
6. The motor according to claim 1 , wherein the conductive terminal has a plate shape with a plate thickness direction oriented in a radial direction and extending in the axial direction, and includes a main body portion welded to the outer circumferential surface.
7. A motor according to claim 1; an impeller that is rotated by the motor; A pump device comprising:
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Patent Citations
Electronic water pump and vehicle
CN211950892U