JP2018166365A - Motor and pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely cover an inner periphery side of a stator core with a resin seal member.SOLUTION: A motor 2 of a pump device 1 includes a resin seal member 13 for covering a stator 11. With the stator 11, a coil 53 is wound about a stator core 51 via an insulator 52. With an inner flange section 62 of the insulator 52, a projection 63 is formed that project to an inner side in a radial direction from a salient pole section 57 of the stator core 51. Therefore, when the stator 11 is positioned in a metal mold 100 and the resin seal member 13 is subjected to insert formation, the projection 63 of the insulator 52 can be used instead of the salient pole section 57 as a portion in contact with a metal mold section (a columnar section 144) in a radial direction disposed in an inner peripheral side of the stator 11. Accordingly, since it is possible not to expose the salient pole section 57 by completely covering it with the resin seal member 13, the stator core can be rust-proofing using neither rust prevention painting nor partition member.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a pump device and a motor used in the pump device.

  Patent Document 1 discloses a pump device that rotates an impeller by a motor. The motor used for the pump apparatus of patent document 1 is provided with the rotor and the stator arrange | positioned at the outer peripheral side of a rotor, and the stator and the rotor are separated by the partition member. The stator includes a stator core, an insulator, and a coil wound around the insulator, and is covered with a resin sealing member. The resin sealing member is formed by placing a partition member with a stator fixed therein in a mold and injecting resin.

  Patent Document 2 discloses a molded motor in which a stator and a substrate are covered with a resin sealing member (resin casing). When forming the resin casing, the stator is placed in the mold and the resin is injected, but the molded motor of Patent Document 2 does not include a partition member. Therefore, the stator is positioned by bringing the end face on the radially inner side of the stator core into contact with a mold disposed on the inner peripheral side of the stator.

Japanese Patent Laid-Open No. 2013-3580 JP-A-2015-154514

  In the case of a motor used in a pump device as in Patent Document 1, liquid leaked from the pump chamber may enter the inner peripheral side of the stator, but in the motor of Patent Document 1, the inner peripheral side of the stator is a partition member. As a result, the stator is protected from liquid and the stator does not rust. However, when the partition member is used, there is a problem that the number of parts increases.

  In addition, since the motor of Patent Document 2 forms the resin sealing member by bringing the end surface on the radially inner side of the stator core into contact with the mold, the stator core cannot be completely covered with the resin sealing member. Therefore, in order to prevent the stator from being rusted, it is necessary to apply a rust preventive agent to the radially inner end face of the stator core that is exposed without being covered with the resin sealing member. Therefore, since the application | coating process and drying process of a rust preventive agent are performed, there exists a problem that productivity falls. Moreover, there exists a possibility that sufficient antirust effect may not be acquired by the application | coating nonuniformity of a rust inhibitor.

  In view of the above problems, an object of the present invention is to completely cover the inner peripheral side of a stator core with a resin sealing member in a motor including a resin sealing member that covers the stator.

  In order to solve the above problems, a motor of the present invention includes a rotor, a stator disposed on an outer peripheral side of the rotor, and a resin sealing member that covers the stator, and the stator includes a stator core, An insulator that covers the stator core, and the insulator includes a protruding portion that protrudes radially inward from an inner peripheral side end surface of a salient pole portion provided on the stator core, and the inner peripheral end surface is the resin sealing member The protruding portion includes an exposed portion exposed from the resin sealing member.

  According to the present invention, the stator core is covered with the insulator, and the insulator includes the protruding portion that protrudes radially inward from the inner peripheral side end face of the salient pole portion of the stator core. Therefore, when forming the resin sealing member by arranging the stator in the mold, the stator and the mold are brought into contact with the mold disposed on the inner peripheral side of the stator and the protrusion formed on the insulator. Can be positioned coaxially. Therefore, the inner peripheral side end surface of the stator core that does not come into contact with the mold can be covered with the resin sealing member. Therefore, since it is not necessary to cover the inner peripheral side end face of the stator core with the partition wall in order to prevent the stator core from being rusted, the number of parts can be reduced as compared with the case where the partition wall is provided. Moreover, since it is not necessary to apply a rust preventive agent to the inner peripheral side end face of the stator core, a reduction in productivity can be suppressed as compared with the case where rust preventive coating is performed.

  In the present invention, it is preferable that the protruding portion is disposed on one side in the axial direction with respect to the salient pole portion, and the exposed portion has an end surface facing the one side. If it does in this way, positioning of the axial direction of a stator core can be performed using the end face of a projection part. Accordingly, since both the radial positioning and the axial positioning can be performed by the protrusions, it is not necessary to expose a part of the stator core to the outside of the resin sealing member for the axial positioning. Therefore, in order to prevent the stator core 51 from rusting, it is not necessary to provide a partition wall that covers the stator core, and it is not necessary to apply a rust preventive agent to the stator core.

  In the present invention, the insulator includes an inner flange portion that protrudes toward the one side of the salient pole portion on an inner peripheral side of a coil wound around the salient pole portion, and the inner flange portion is formed from the protrusion portion. It is desirable to protrude to the one side. Thus, if the inner flange protrudes to one side in the axial direction from the protruding portion, the winding drawn from the coil wound around the salient pole portion via the insulator when positioning the stator in the mold. However, there is little possibility of being pinched | interposed between a protrusion part and a metal mold | die. Therefore, there is little possibility that the winding is exposed from the resin sealing member.

  In the present invention, it is possible to adopt a configuration in which the protruding portion has a smaller width in the circumferential direction than the inner flange portion and is arranged at the center in the circumferential direction of the inner flange portion. If it does in this way, the part of the insulator exposed from a resin sealing member can be made small. Further, by reducing the size of the protruding portion, the resin can be efficiently filled into the inner peripheral side of the salient pole portion.

  Or the structure which the width | variety of the circumferential direction is the same as the said inner side collar part can be employ | adopted for the said protrusion part. If it does in this way, the shape of an insulator can be simplified. Further, since the contact surface between the stator and the mold can be expanded in the circumferential direction, the stator can be stably supported in the mold.

  Further, in the present invention, it is possible to adopt a configuration in which a groove that divides the inner peripheral side end surface in the circumferential direction is formed on the inner peripheral side end surface, and the protruding portion is arranged in the groove. For example, when a so-called dummy slot is formed in the salient pole portion of the stator core, a groove (auxiliary groove) is formed on the inner peripheral side end face of the stator core. In this case, since the rib-like protruding portion disposed in the groove (auxiliary groove) can be formed on the insulator, one or both of the radial positioning and the axial positioning can be performed using the protruding portion. It can be carried out. When the rib-like protrusion is disposed in the groove, the radial thickness of the protrusion can be increased, and the axial dimension of the protrusion can be increased. By using the dummy slot, the radial thickness of the protruding portion can be ensured without increasing the gap between the salient pole portion and the facing magnet. Therefore, since the strength of the protrusion can be increased, the stator can be stably supported when positioning the stator by bringing the protrusion into contact with the mold.

In the present invention, it is desirable that the projecting portion has an arcuate inner peripheral surface whose arcuate cross section is cut by a plane perpendicular to the axial direction. If it does in this way, a projection part can be made to contact by the field to the peripheral face of the cylinder part of a metallic mold. Therefore, the stator can be stably supported.

  In this invention, the said resin sealing member is provided with the sealing member bottom part which covers the said stator on the opposite side of the said axial direction with respect to the said stator core, The said sealing member bottom part is the said opposite of the said insulator The structure provided with the through-hole which penetrates the site | part which overlaps with the end surface of a side in an axial direction is employable. In this way, the insulator is in contact with the mold on one side in the axial direction, and the end surface on the other side (that is, the side opposite to the protruding portion with respect to the stator core) is formed on the resin sealing member. It can be pressed by a pressing pin through the formed through hole. Accordingly, since the protruding portion can be pressed against the mold via the pressing pin, the stator can be positioned in the axial direction within the mold using the insulator.

  Next, a pump device according to the present invention includes the above-described motor and an impeller attached to a rotation shaft of the rotor.

  According to the present invention, when the resin sealing member is formed by arranging the stator in the mold, the mold disposed on the inner peripheral side of the stator is brought into contact with the protrusion formed on the insulator. And the mold can be positioned coaxially, and the inner peripheral side end face of the stator core that does not contact the mold can be covered with the resin sealing member. Therefore, since it is not necessary to cover the inner peripheral side end face of the stator core with the partition walls in order to prevent the stator core from being rusted, the number of parts can be reduced as compared with the case where the partition walls are provided. Moreover, since it is not necessary to apply a rust preventive agent to the inner peripheral side end face of the stator core, a reduction in productivity can be suppressed as compared with the case where rust preventive coating is performed.

1 is an external perspective view of a pump device to which the present invention is applied. It is sectional drawing of the pump apparatus of FIG. It is a disassembled perspective view of the motor seen from the output side. It is a disassembled perspective view of the motor seen from the non-output side. It is the perspective view which looked at the stator from the output side. It is the disassembled perspective view which looked at one of the stator core and the some insulator from the output side. It is the perspective view which looked at the stator and the resin sealing member from the output side. It is sectional drawing of a stator and a resin sealing member. It is sectional drawing and the partial enlarged view of the metal mold | die used at the process of integrally molding a resin sealing member with a stator. It is the perspective view and partial expansion perspective view of a metal mold body. It is the top view which looked at the stator from the non-output side. It is the perspective view which looked at the stator of the modification 1 from the output side. It is the perspective view which looked at the stator of the modification 2 from the output side. It is the disassembled perspective view which looked at one of the stator core and the some insulator of the modification 2 from the output side.

  Hereinafter, embodiments of a pump device and a motor to which the present invention is applied will be described with reference to the drawings.

(Pump device)
FIG. 1 is an external perspective view of a pump device 1 to which the present invention is applied. FIG. 2 is a cross-sectional view of the pump device 1. The pump device 1 is attached to the motor 2, the case 2 that forms the pump chamber 4 between the motor 2, and the impeller that is attached to the rotating shaft 5 of the motor 2 and disposed in the pump chamber 4. 6. The case body 3 is provided with a fluid suction port 7 and a discharge port 8. When the motor 2 is driven to rotate the impeller 6, fluid such as water sucked from the suction port 7 is discharged from the discharge port 8 through the pump chamber 4.

  In this specification, the symbol L indicates the axial direction of the motor 2, the output side L1 is one side in the axis L direction, and the counter-output side L2 is the other side in the axis L direction. FIG. 1 is an external perspective view of the pump device 1 as viewed from the non-output side L2. The rotation shaft 5 of the motor 2 extends in the direction of the axis L. The side on which the impeller 6 is disposed with respect to the motor 2 is referred to as an output side L1, and the side opposite to the output side L1 is referred to as a counter-output side L2. In addition, a direction orthogonal to the axis L is a radial direction, and a periphery of the axis L is a circumferential direction. As shown in FIG. 2, the suction port 7 is provided in the case body 3 at a position overlapping the axis L of the rotation shaft 5 of the motor 2, and the discharge port 8 is provided on the outer side in the radial direction of the rotation shaft 5.

  3 is an exploded perspective view of the motor 2 as viewed from the output side L1, and FIG. 4 is an exploded perspective view of the motor as viewed from the non-output side L2. 3 and 4 show a state where the cover member 14 constituting the housing 12 of the motor 2 is removed from the resin sealing member 13. The motor 2 is a DC brushless motor, and includes a rotor 10, a stator 11, and a housing 12 (see FIG. 2) that stores these. The housing 12 includes a resin sealing member 13 that covers the stator 11 from the non-output side L2, and a cover member 14 that covers the resin sealing member 13 from the output side L1. The cover member 14 is fixed to the resin sealing member 13. In this embodiment, the cover member 14 and the resin sealing member 13 are rotated relative to each other in the circumferential direction, and the engagement protrusion 85 of the resin sealing member 13 and the rotation engagement portion of the cover member 14 are rotated as shown in FIG. 86 is engaged.

  As shown in FIG. 2, the cover member 14 is covered with the case body 3 from the output side L1. Thereby, the space defined between the cover member 14 and the case body 3 becomes the pump chamber 4. The resin sealing member 13 holds a first bearing member 15 that rotatably supports an end of the rotating shaft 5 of the rotor 10 on the counter-output side L2. The cover member 14 holds a second bearing member 16 that rotatably supports the middle of the rotary shaft 5. A gap between the rotary shaft 5 and the cover member 14 and the second bearing member 16 is sealed by a seal member 95. An end portion on the output side L1 of the rotary shaft 5 protrudes from the housing 12 of the motor 2 into the pump chamber 4, and the impeller 6 is attached thereto.

(Rotor)
As shown in FIG. 2, the rotor 10 includes a rotating shaft 5, a magnet 20 that surrounds the rotating shaft 5, and a holding member 21 that holds the rotating shaft 5 and the magnet 20. The magnet 20 is annular and is arranged coaxially with the rotating shaft 5. On the outer peripheral surface of the magnet 20, N poles and S poles are alternately magnetized in the circumferential direction. The rotating shaft 5 is made of stainless steel. The rotary shaft 5 is formed with an annular groove near the center in the direction of the axis L, and the E-ring 24 is fixed to the annular groove. The E ring 24 is a metal plate-like member. The E ring 24 is embedded in the end face of the output side L1 of the holding member 21.

  The rotor 10 includes a first bearing plate 45 disposed on the non-output side L2 of the holding member 21 and a second bearing plate 46 disposed on the output side L1 of the holding member 21. The first bearing plate 45 covers the end surface of the holding member 21 on the non-output side L2 in a state where the rotation shaft 5 is passed through the center hole. The second bearing plate 46 covers the end surface of the output side L1 of the holding member 21 and the E-ring 24 in a state where the rotation shaft 5 is passed through the center hole. The second bearing plate 46 is in surface contact with the E-ring 24. The first bearing plate 45 and the second bearing plate 46 are held on the end face on the counter-output side L2 and the end face on the output side L1 of the holding member 21, respectively. The sliding heat generated by the sliding of the second bearing plate 46 and the second bearing member 16 during rotation of the rotor 10 is transmitted to the rotating shaft 5 via the E-ring 24 and radiated.

(Stator)
FIG. 5 is a perspective view of the stator as viewed from the output side L1. FIG. 6 is an exploded perspective view of the stator core and one of the plurality of insulators as viewed from the output side L1. As shown in FIGS. 2 and 5, the stator 11 includes an annular stator core 51 located on the outer peripheral side of the rotor 10, a plurality of coils 53 wound around the stator core 51 via an insulator 52, and each coil 53. And a connector 54 for connecting a power supply line for supplying power. In addition, illustration of the connector 54 is abbreviate | omitted in FIG. As shown in FIG. 2, the connector 54 has a shape in which a male external connector can be attached and detached, and is disposed on the outer peripheral side of the insulator 52 and on the opposite output side L <b> 2 of the stator core 51. The connector 54 includes a substantially rectangular parallelepiped connector housing 30 connected to one of the plurality of insulators 52 and terminal pins 40 held by the connector housing 30.

  The coil 53 is constituted by a conducting wire made of an aluminum alloy or a copper alloy. The motor 2 is a three-phase brushless motor, three of the nine coils 53 are U-phase coils, three of the remaining six are V-phase coils, and the remaining three are W-phases. It is a coil. Conductive wires constituting the U-phase coil, the V-phase coil, and the W-phase coil are routed to the connector 54.

  The stator core 51 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. As shown in FIG. 6, the stator core 51 includes an annular portion 56 and a plurality of salient pole portions 57 that protrude radially inward from the annular portion 56. The plurality of salient pole portions 57 are formed at an equiangular pitch, and are arranged at a constant pitch in the circumferential direction. The salient pole portion 57 includes a body portion 58 that extends in the radial direction, and a tip portion 59 that extends in a circular arc shape on both sides in the circumferential direction around the body portion 58. An inner peripheral end surface 57 a of the salient pole portion 57 is formed at the tip portion 59. The inner peripheral end surface 57a is an arc surface centered on the axis L, and is opposed to the outer peripheral surface of the magnet 20 of the rotor 10 with a predetermined gap.

(Insulator)
The insulator 52 is made of an insulating material such as resin. The insulator 52 has a flanged cylindrical shape having flanges at both ends in the radial direction. The insulator 52 is attached to each of the plurality of salient pole portions 57. That is, the stator 11 includes the same number of insulators 52 as the salient pole portions 57. 6 shows a state in which the insulator 52 is divided into two in the direction of the axis L, but the insulator 52 does not assemble two parts as shown in FIG. 6, but arranges the stator core 51 in the mold. And the insulator 52 can also be integrally molded by insert molding.

  As shown in FIG. 6, the insulator 52 includes a cylindrical part 60 that covers the body part 58 of the salient pole part 57, an outer flange part 61 provided at the radially outer end of the cylindrical part 60, and a cylindrical shape. An inner flange 62 is provided at the radially inner end of the portion 60. The coil 53 is wound around each of the plurality of salient pole portions 57 via the cylindrical portion 60 of the insulator 52. The outer flange 61 is disposed on the radially outer side of the coil 53, and the inner flange 62 is disposed on the radially inner side of the coil 53.

  As shown in FIG. 5, the outer flange portion 61 of the insulator 52 partially covers the annular portion 56 of the stator core 51 from both sides in the axis L direction, but the outer peripheral edge portion of the counter-output side end surface 56 a of the annular portion 56. The outer peripheral edge portion of the output side end surface 56 b of the annular portion 56 is not covered with the outer flange portion 61. The outer flange 61 includes an outer arc-shaped portion 61a that covers the inner peripheral edge portion of the annular portion 56 from the output side L1, and an outer arc-shaped portion 61b that covers the inner peripheral edge portion of the annular portion 56 from the non-output side L2. Wall portions 61c are formed at both ends of the outer arcuate portions 61a and 61b in the circumferential direction. The conducting wire (not shown) drawn from the coil 53 is guided and guided by the wall portion 61c.

The inner flange portion 62 of the insulator 52 includes an inner wall portion 62a that covers the outer peripheral edge portion of the tip portion 59 of the salient pole portion 57 from the output side L1, and an inner wall portion that covers the outer peripheral edge portion of the tip portion 59 from the non-output side L2. 62b. The inner wall 62a protrudes from the tip 59 of the salient pole 57 to the output side L1, and the inner wall 62b protrudes from the tip 59 of the salient pole 57 to the non-output side L2. On the output side L1 of the salient pole portion 57, a protruding portion 63 is formed that protrudes radially inward from the circumferential center of the inner wall portion 62a. The protrusion 63 abuts on the end face of the salient pole portion 57 on the output side L1. In the insulator 52, the inner wall portion 62 a has a shape that protrudes further to the output side L <b> 1 than the protruding portion 63.

  The inner wall portions 62 a and 62 b have the same circumferential width as the tip portion 59 of the salient pole portion 57, and the protruding portion 63 has a smaller circumferential width than the inner flange portion 62 and the tip portion 59. The protrusion 63 has a substantially constant dimension in the direction of the axis L, and extends in the circumferential direction along the edge on the output side L1 of the tip 59. The protruding portion 63 protrudes radially inward from the inner peripheral side end surface 57 a of the salient pole portion 57. An end surface on the radially inner side of the protruding portion 63 is an arc-shaped inner peripheral surface 63 a centering on the axis L. The arc-shaped inner peripheral surface 63 a is located on the radially inner side from the inner peripheral side end surface 57 a of the salient pole portion 57. Moreover, the protrusion part 63 is provided with the output side end surface 63b connected with the edge of the output side L1 of the circular arc shaped internal peripheral surface 63a. The output side end surface 63b is a flat surface that is orthogonal to the axis L direction and faces the output side L1. The protruding portion 63 of this embodiment includes an exposed portion 70 (see FIGS. 7 and 8) exposed from the resin sealing member 13 to the inner peripheral side. The exposed portion 70 is constituted by a part of the output side end face 63b and an arcuate inner peripheral face 63a.

(Resin sealing member)
As shown in FIG. 2, the resin sealing member 13 includes a coil 53, an insulator 52, and a substantially disk-shaped sealing member bottom portion 65 that covers the stator core 51 from the non-output side L2. A bearing member holding recess 68 is provided in the central portion of the sealing member bottom 65. The bearing member holding recess 68 holds the first bearing member 15 that rotatably supports the end on the counter-output side L2 of the rotating shaft 5 of the rotor 10. Further, the resin sealing member 13 includes a connector sealing portion 66 extending from the sealing member bottom portion 65 to the outer peripheral side and covering the connector 54, and extending from the sealing member bottom portion 65 to the output side L1, extending to the coil 53, the insulator 52, and And a sealing member cylinder portion 67 covering the stator core 51.

  The sealing member cylinder portion 67 has a thick cylindrical shape. The central axis of the sealing member cylinder 67 coincides with the axis L of the motor 2. As shown in FIG. 3, the sealing member cylinder part 67 includes a large diameter cylinder part 81 connected to the sealing member bottom part 65 and a small diameter cylinder part 82 having a smaller outer diameter than the large diameter cylinder part 81. The small-diameter cylindrical portion 82 is a first small-diameter cylindrical portion 82a that constitutes an end portion on the output side L1 of the sealing member cylindrical portion 67, and a first small-diameter cylindrical portion 82a provided between the first small-diameter cylindrical portion 82a and the large-diameter cylindrical portion 81. Two small-diameter cylindrical portions 82b are provided. The first small diameter cylindrical portion 82a has a slightly smaller outer diameter than the second small diameter cylindrical portion 82b. The outer diameter of the large-diameter cylindrical portion 81 is larger than the outer diameter of the annular portion 56 of the stator core 51, and the outer diameter of the second small-diameter cylindrical portion 82 b is smaller than the outer diameter of the annular portion 56 of the stator core 51. For this reason, at the boundary between the large-diameter cylindrical portion 81 and the second small-diameter cylindrical portion 82b, an arcuate opening 83 that exposes the outer peripheral edge portion of the counter-output side end surface 56a of the annular portion 56 of the stator core 51 to the output side L1 (see FIG. 3) is formed.

  The stator 11 is the resin sealing member 13 except for a part of the annular portion 56 of the stator core 51 exposed to the output side L1 from the arc-shaped opening 83 of the resin sealing member 13 and the exposed portion 70 of the insulator 52 described above. Covered by. The exposed portion 70 is exposed to the radially inner side and the output side L1 from an opening 64 and a notch portion 69, which will be described later, formed on the inner peripheral surface of the sealing member cylinder portion 67. The portion of the stator 11 exposed from the resin sealing member 13 is a portion that comes into contact with a support surface (an outer peripheral side support surface 145 and an inner peripheral side support surface 148 described later) when the resin sealing member 13 is molded. It is.

7 is a perspective view of the stator 11 and the resin sealing member 13 as viewed from the output side L1, and FIG. 8 is a cross-sectional view of the stator 11 and the resin sealing member 13. The inner peripheral surface of the sealing member cylindrical portion 67 has a small-diameter inner peripheral surface portion 67a and a small-diameter inner peripheral surface portion 67 from the counter-output side L2 toward the output side L1.
A large-diameter inner peripheral surface portion 67b having a larger inner diameter than a is provided. The small-diameter inner peripheral surface portion 67a is formed with a plurality of rectangular openings 64 that expose the arc-shaped inner peripheral surface 63a formed in each protruding portion 63 of the insulator 52 radially inward. The arc-shaped inner peripheral surface 63a is located on the same plane as the small-diameter inner peripheral surface portion 67a. The small-diameter inner peripheral surface portion 67a is provided with a plurality of groove-shaped notches 69 extending in the direction of the axis L at the central angular position of the opening 64 in the circumferential direction. The notch 69 is recessed outward in the radial direction. Each of the plurality of openings 64 and notches 69 is located at the center in the circumferential direction of each salient pole portion 57 of the stator core 51. The notch 69 extends from the end surface on the output side L1 of the small-diameter inner peripheral surface portion 67a to the opening 64. For this reason, the output side end face 63b of the protrusion 63 is exposed to the output side L1 at the angular position where the notch 69 is provided.

  On the outer peripheral surface of the large-diameter cylindrical portion 81 of the sealing member cylindrical portion 67, four engaging protrusions 85 that protrude toward the outer peripheral side at equal angular intervals are provided. The engagement protrusion 85 engages with a rotation engagement portion 86 provided on the cover member 14. The engagement protrusion 85 engages with the rotation engagement portion 86 and restricts the cover member 14 from being detached from the resin sealing member 13.

  The resin sealing member 13 completely covers the coil 53 and protects the coil 53 from fluid. Further, the resin sealing member 13 is integrally formed up to the connector sealing portion 66 that covers the connector 54 provided on the stator 11. The resin sealing member 13 is formed of BMC (Bulk Molding Compound). In this embodiment, the stator 11 is disposed in a mold 100 (see FIG. 9) described later, and a resin material is injected into the mold 100 and cured to form the resin sealing member 13. That is, the resin sealing member 13 is integrally formed with the stator 11 by insert molding.

  As shown in FIG. 4, the sealing member bottom 65 is formed with a plurality of through-holes 17 that open to the surface of the sealing member bottom 65 opposite to the output side L2. In this embodiment, six through holes 17 are formed in the sealing member bottom portion 65. Specifically, a set of two through holes 17 arranged at a 40 ° pitch centered on the axis L is formed at three locations at a 120 ° pitch. As shown in FIG. 8, each of the six through-holes 17 has an end surface (outer arcuate portion 61b) on the opposite output side L2 of the outer flange 61 of the insulator 52 from the opposite output side L2 surface of the sealing member bottom 65. To the end face). The through-hole 17 is a pressing pin for pressing the stator 11 set in the mold at the time of molding in the direction of the axis L and pressing it against the support surfaces (outer peripheral support surface 145 and inner peripheral support surface 148 described later). The shape corresponds to 190.

(Molding process of resin sealing member)
FIG. 9A is a cross-sectional view of the mold 100 used in the step of integrally molding the resin sealing member 13 with the stator 11, and FIG. 9B is a partially enlarged view of region A in FIG. 9A. It is. FIG. 10A is a perspective view of the mold main body 140, and FIG. 10B is a partially enlarged view of the mold main body 140 (enlarged view of region B in FIG. 10A). In this embodiment, a process of molding the resin sealing member 13 by insert molding after the assembly process of the stator 11 is performed. The mold 100 used for insert molding includes a first mold 110 and a second mold 120 that is combined with the opposite output side L2 of the first mold 110. When the first mold 110 and the second mold 120 are combined, a cavity 130 corresponding to the shape of the resin sealing member 13 is formed inside the mold 100. The resin sealing member 13 is formed by injection molding that fills the cavity 130 in which the stator 11 is disposed with resin.

The first mold 110 includes a mold body 140 and a plurality of ejector pins 150 for pushing out the stator 11 with the resin sealing member 13 from the mold body 140. As shown in FIG. 10A, on the surface of the mold main body 140 on the non-output side L2, an annular recess 141 constituting a part of the cavity 130 and a molten resin provided radially outside the recess 141 Is formed, and a runner 143 that connects the sprue 142 and the recess 141 is formed. The sprue 142 and the runner 143 have a groove shape, and the runner 143 is divided into two forks from the sprue 142. In addition, illustration of the sprue 142 and the runner 143 is abbreviate | omitted in Fig.9 (a).

  A cylindrical portion 144 disposed on the inner peripheral side of the stator 11 is formed in the center of the concave portion 141 in the radial direction. The cylindrical portion 144 is formed coaxially with the inner peripheral surface of the recess 141. The cylindrical portion 144 protrudes from the bottom surface of the concave portion 141 to the counter-output side L2, and the tip of the cylindrical portion 144 projects from the opening of the concave portion 141 to the counter-output side L2. In addition, a plurality of through holes 151 in which each of the plurality of ejector pins 150 is disposed are formed on the bottom surface of the recess 141. The through hole 151 communicates from the bottom surface of the recess 141 to the output side L1 surface of the mold body 140. The ejector pin 150 is movable in the direction of the axis L within the through hole 151.

  On the surface of the mold main body 140 on the counter-output side L 2, the outer edge portion of the recess 141 is an outer peripheral side support surface 145 that abuts against the stator 11. The outer peripheral side support surface 145 is an annular flat surface that is orthogonal to the direction of the axis L and faces the opposite output side L2. The outer peripheral support surface 145 is used as a positioning surface that contacts the annular portion 56 of the stator core 51 in the axis L direction when the stator 11 is positioned in the axis L direction with respect to the first mold 110.

  In the mold body 140, a plurality of ribs 146 projecting radially inward are formed on the inner peripheral surface of the recess 141, and a plurality of ribs 147 projecting radially outward are formed on the outer peripheral surface of the cylindrical portion 144. Is done. The ribs 146 and 147 are formed at the same angular position, and are formed at nine places at a 40 ° pitch centered on the central axis (axis line L) of the recess 141. The surfaces of the ribs 146 and 147 have an arc shape when viewed in the direction of the axis L. The rib 147 provided on the outer peripheral surface of the cylindrical portion 144 extends to a midway position in the axis L direction of the cylindrical portion 144, and the inner peripheral side support that is a flat surface orthogonal to the axis L at the tip of the counter-output side L2 A surface 148 is formed. The inner peripheral support surface 148 is used as a positioning surface that contacts the protruding portion 63 of the insulator 52 in the axis L direction when the stator 11 is positioned in the axis L direction with respect to the first mold 110.

  The second mold 120 includes a mold body 160, a plurality of ejector pins 170 for pushing out the stator 11 with the resin sealing member 13 from the mold body 160, and 2 formed on the first mold 110. Two gate cut pins 180 formed at positions corresponding to the crotch-shaped runner 143 and six pressing pins 190 for pressing the stator 11 against the first mold 110 are provided. The runner 143 may not be bifurcated. When the number of runners 143 is one, the number of gate cut pins 180 may be one.

  A circular recess 161 constituting a part of the cavity 130 is formed on the surface of the output side L1 of the mold body 160. The recess 161 is formed to be coaxial with the recess 141 on the first mold 110 side when the first mold 110 and the second mold 120 are combined. The recess 161 has a larger outer diameter than the recess 141 on the first mold 110 side.

  The mold body 160 is formed with six through holes 191 in which each of the six pressing pins 190 is disposed. The through hole 191 communicates from the output side L1 surface of the mold body 160 to the bottom surface of the recess 161. The pressing pin 190 is fixed to the mold body 160, and the tip of the pressing pin 190 protrudes into the recess 161. In this embodiment, a set of two pressing pins 190 arranged at a 40 ° pitch centered on the central axis (axis L) of the recess 141 is a 120 ° pitch centered on the central axis (axis L) of the recess 141. It is arranged at three places.

Further, the mold body 160 is formed with a plurality of through holes 171 in which each of the plurality of ejector pins 170 is disposed, and a plurality of through holes 181 in which each of the plurality of gate cut pins 180 is disposed. The through-hole 171 communicates from the bottom surface of the recess 161 to the surface on the counter-output side L2 of the mold body 160. Further, the through-hole 181 communicates from the surface on the output side L1 of the mold body 160 to the surface on the counter-output side L2. The ejector pin 170 and the gate cut pin 180 can move in the direction of the axis L in the through holes 171 and 181.

  When insert molding is performed, a resin is injected into the mold 100 in a state where the stator 11 disposed in the mold 100 is positioned in contact with the mold 100 in the radial direction and the axis L direction, and a resin sealing member 13 is molded. A contact portion of the stator 11 with the mold 100 becomes an exposed portion that is exposed without being covered by the completed resin sealing member 13. In this embodiment, the protruding portion 63 of the insulator 52 and the outer peripheral edge portion of the annular portion 56 of the stator core 51 serve as contact portions with the mold 100, so that this portion is exposed without being covered by the resin sealing member 13.

  First, the stator 11 is positioned with respect to the first mold 110. That is, the cylindrical portion 144 of the first mold 110 is inserted into the inner peripheral side of the stator 11, and the stator 11 is disposed in the concave portion 141 of the first mold 110. At this time, in the stator 11, the arcuate inner peripheral surface 63 a of the protruding portion 63 provided on the insulator 52 abuts on the outer peripheral surface of the columnar portion 144. That is, the stator 11 is positioned so as to be coaxial with the cylindrical portion 144 and the concave portion 141 by causing the protruding portion 63 of the insulator 52 to contact the cylindrical portion 144 in the radial direction. At this time, a gap is formed between the salient pole portion 57 of the stator core 51 and the outer peripheral surface of the cylindrical portion 144.

  In addition, the stator 11 has an outer peripheral edge portion of the annular portion 56 of the stator core 51 that comes into contact with an outer peripheral side support surface 145 provided at an outer edge portion of the concave portion 141 from the counter-output side L2, and a protruding portion 63 of the insulator 52. The output side end face 63b is positioned in the axis L direction by coming into contact with the inner peripheral side support surface 148 provided on the cylindrical portion 144 from the non-output side L2.

  Next, the first mold 110 and the second mold 120 to which the stator 11 is attached are combined. That is, the first mold 110 and the second mold 120 are combined so that the center of the cylindrical portion 144 on the first mold 110 side and the center of the recess 161 on the second mold 120 side coincide with each other. A cavity 130 is formed between the mold 110 and the second mold 120. Further, the tips of the six pressing pins 190 attached to the through holes 191 of the second mold 120 are brought into contact with the outer flange 61 of the insulator 52 to press the stator 11 against the first mold 110.

  FIG. 11 is a plan view of the stator 11 as viewed from the non-output side L2. In FIG. 11, the positions where the six pressing pins 190 abut are indicated by broken lines. The six pressing pins 190 are arranged at angular positions that coincide with the six circumferential centers of the nine insulators 52. The insulator 52 has a flat surface in which the center in the circumferential direction of the outer flange 61 is perpendicular to the axis L direction, and the pressing pin 190 is disposed at a position overlapping the center in the circumferential direction of the outer flange 61 in the axis L direction. The The pressing pin 190 abuts against the outer arcuate portion 61 b of the outer flange 61 from the non-output side L <b> 2 and presses the stator 11 against the first mold 110.

  Subsequently, a resin is filled in the cavity 130 formed between the first mold 110 and the second mold 120. When the resin filled in the cavity 130 is cured, the stator 11 with the resin sealing member 13 is removed from the first mold 110 and the second mold 120, and the stator 11 with the resin sealing member 13 is completed.

Since a gap is provided between the salient pole portion 57 of the stator core 51 and the outer peripheral surface of the cylindrical portion 144 in the mold 100, as shown in FIGS. 7 and 8, the tip of the salient pole portion 57 of the stator core 51. The part 59 is covered with the resin sealing member 13. Therefore, the stator core 51 is not exposed on the inner peripheral surface of the completed resin sealing member 13. On the other hand, on the inner peripheral surface of the completed resin sealing member 13, a notch 69 is formed as a reverse shape of the rib 147 formed in the cylindrical portion 144 of the first mold 110, and the diameter of the cylindrical portion 144 is the same as that of the cylindrical portion 144. A rectangular opening 64 that exposes the protruding portion 63 of the insulator 52 that is in contact with the direction is formed. The notch 69 is connected to the output side end face 63 b of the protrusion 63. Accordingly, the protruding portion 63 of the insulator 52 has two portions, that is, a portion of the output side end surface 63b located inside the notch portion 69 and an arcuate inner peripheral surface 63a in contact with the cylindrical portion 144, and the completed resin sealing member 13. The exposed portion 70 is exposed on the inner peripheral surface.

  Further, in the second small-diameter cylindrical portion 82 b of the completed resin sealing member 13, a notch portion 84 that is a reverse shape of the rib 146 formed on the inner peripheral surface of the concave portion 141 of the first mold 110 is formed. Furthermore, the through-hole 17 which is the arrangement | positioning trace of the press pin 190 is formed in the sealing member bottom part 65 of the completed resin sealing member 13 (refer FIG. 4). As shown in FIG. 8, the through hole 17 communicates from the surface on the non-output side L2 of the sealing member bottom 65 to the outer arcuate portion 61 b of the insulator 52.

(Main effects of this embodiment)
As described above, in the motor 2 and the pump device 1 of the present embodiment, the insulator 52 that covers the stator core 51 is formed with the protruding portion 63 that protrudes radially inward from the inner peripheral side end surface 57a of the salient pole portion 57 of the stator core 51. ing. Therefore, when the stator 11 is disposed in the mold 100 and the resin sealing member 13 is inserted and formed, the mold portion (cylindrical portion 144) and the protruding portion 63 disposed on the inner peripheral side of the stator 11 are arranged in the radial direction. The stator 11 and the first mold 110 can be positioned coaxially with each other. As a result, the protruding portion 63 includes the exposed portion 70 that is not covered by the completed resin sealing member 13, but the stator core 51 has an inner peripheral side end surface 57 a that is radially with the cylindrical portion 144 of the first mold 110. Therefore, it is completely covered by the resin sealing member 13. In this way, by using the insulator 52 instead of the stator core 51 for the positioning of the stator 11 in the radial direction, the stator core 51 is not exposed on the inner peripheral side of the resin sealing member 13. It is possible to prevent the stator core 51 from rusting when liquid enters. Therefore, since it is not necessary to cover the inner peripheral side end face 57a of the stator core 51 with the partition wall in order to prevent the stator core 51 from being rusted, the number of parts can be reduced as compared with the case where the partition wall is provided. Moreover, since it is not necessary to apply a rust preventive agent to the inner peripheral side end face 57a of the stator core 51, a decrease in productivity can be suppressed as compared with the case where rust preventive coating is performed.

  In this embodiment, the protruding portion 63 is disposed on the output side L1 (one side in the axis L direction) with respect to the salient pole portion 57, and the output side end surface 63b (end surface facing the output side L1) of the protruding portion 63 is resin-sealed. The exposed surface is not covered by the member 13. Therefore, the positioning of the stator 11 in the axis L direction can be performed using the protrusion 63 provided for positioning the stator 11 in the radial direction. For example, the stator 11 can be positioned by bringing the inner peripheral support surface 148 formed in the first mold 110 into contact with the output side end surface 63b of the protrusion 63 in the direction of the axis L. As described above, since both the radial positioning of the stator 11 and the positioning in the axis L direction can be performed by using the protrusion 63, a part of the stator core 51 is resin-sealed for positioning in the axis L direction. There is no need to expose the member 13 to the outside. Therefore, in order to prevent the stator core 51 from rusting, it is not necessary to provide a partition wall that covers the stator core 51, and it is not necessary to apply a rust inhibitor to the stator core 51.

The insulator 52 of this embodiment includes an inner flange 62 that protrudes to the output side L1 of the salient pole 57 on the inner peripheral side of the coil 53 wound around the salient pole 57 of the stator core 51. Is provided with an inner wall portion 62a having a shape protruding from the protruding portion 63 toward the output side L1. As described above, if the inner flange 62 protrudes from the protrusion 63 toward the output side L1, when the stator 11 is positioned in the mold 100, the winding drawn from the coil 53 is connected to the protrusion 63 and the mold 100. There is little possibility of being caught between. Therefore, there is little possibility that the winding is exposed from the resin sealing member 13.

  The protrusion 63 of this embodiment has a smaller width in the circumferential direction than the inner flange 62 and is arranged at the center in the circumferential direction of the inner flange 62. If it does in this way, the part exposed from the resin sealing member 13 can be made small. Further, by reducing the size of the protruding portion 63, the resin injected into the mold 100 can be efficiently filled into the inner peripheral side of the salient pole portion 57.

  In this embodiment, the radially inner surface of the protrusion 63 is an arc-shaped inner peripheral surface 63a, and the arc-shaped inner peripheral surface 63a has a cross-sectional shape cut by a plane perpendicular to the axis L direction. The arc shape is based on the axis L which is the center in the radial direction. The arc-shaped inner peripheral surface 63 a having such a shape is in contact with the outer peripheral surface of the mold (cylindrical portion 144) disposed on the inner peripheral side of the stator 11, and thus protrudes from the outer peripheral surface of the cylindrical portion 144. The part 63 can be made to contact stably. Therefore, the stator 11 can be stabilized in the mold 100.

  The resin sealing member 13 of this embodiment includes a sealing member bottom portion 65 that covers the stator 11 on the opposite side of the projection core 63 in the direction of the axis L with respect to the stator core 51, and the sealing member bottom portion 65 is opposite to the insulator 52. A through hole 17 is provided that penetrates a portion that overlaps the end surface of the output side L2 (the outer arc-shaped portion 61b of the outer flange 61) in the direction of the axis L. In this way, the insulator 52 contacts the first mold 110 on one side (output side L1) in the direction of the axis L, and the end surface on the other side (counter output side L2) is formed on the resin sealing member 13. It can be pressed by the pressing pin 190 through the formed through hole 17. Therefore, since the protrusion 63 can be pressed against the first mold 110 via the pressing pin 190, the stator 11 can be positioned in the mold 100 in the direction of the axis L using the insulator 52.

(Modification 1)
The protrusion 63 in the above form has a shape in which the circumferential width is smaller than the width in the circumferential direction of the inner flange part 62 of the insulator 52, but the protrusion 63 has a position and size different from those in the above form. Can do. FIG. 12 is a perspective view of the stator 11 of Modification 1 as viewed from the output side L1. In the following description, the same parts as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted, and different parts are denoted by different reference numerals. The stator 11 of the modification 1 is provided with the protrusion part 263 with a larger width in the circumferential direction than the above-described form. The circumferential width of the protruding portion 263 is the same as the circumferential width of the inner flange portion 62 and the circumferential width of the tip portion 59. The shape of the insulator 52 can be simplified by matching the circumferential width of the protruding portion 263 with the circumferential width of the inner flange 62 (inner wall portion 62a).

  The protruding portion 263 has the same protruding dimension toward the inside in the radial direction as the above-described form, and the dimension (thickness) in the axis L direction is also the same as the above-described form. Note that the dimension (thickness) in the direction of the axis L of the protrusion 263 may not be the same as that in the above embodiment. Further, the position of the protruding portion 263 in the direction of the axis L may be a position away from the edge on the output side L1 of the distal end portion 59. However, it is desirable that the position is lower than the tip of the output side L1 of the inner flange 62. Since the leading end of the output side L1 of the inner flange 62 protrudes to the output side L1 rather than the protruding portion 263, there is less risk of a conductive wire being caught between the protruding portion 263 and the mold, as in the above-described form. The possibility that the conductive wire is exposed on the surface of the resin sealing member 13 can be reduced.

The projecting portion 263 of Modification 1 extends in the circumferential direction along the edge of the output side L1 of the tip portion 59. The protrusion 263 includes an arcuate inner peripheral surface 263a that faces radially inward and an output-side end surface 263b that is orthogonal to the direction of the axis L. When insert molding the resin sealing member 13, the inner circumferential arc surface 263 a is brought into contact with the outer circumferential surface of the cylindrical portion 144 of the first mold 110 to perform radial positioning, and is formed in the cylindrical portion 144. The output side end surface 263b is brought into contact with the inner peripheral side support surface 148, and the stator 11 is positioned in the direction of the axis L, and the stator 11 is supported by the inner peripheral side support surface 148. The arcuate inner peripheral surface 263 a becomes an exposed portion 270 exposed from the completed resin sealing member 13. Moreover, since the notch part 69 is formed in the completed resin sealing member 13 similarly to the said form, the area | region of the output side end surface 263b enclosed by the notch part 69 also becomes the exposed part 270. FIG.

  In Modification 1, since the circumferential width of the protruding portion 263 is large, the contact area with the cylindrical portion 144 can be expanded in the circumferential direction. Therefore, the stator 11 can be supported stably. Further, since the angle range in which the output side end surface 263b is provided is wide, it is easy to match the angle range of the output side end surface 263b with the angular position of the inner peripheral support surface 148. Therefore, the output side end surface 263b and the inner peripheral side support surface 148 can be easily brought into contact with each other. Further, by increasing the circumferential width of the inner circumferential support surface 148, the contact area with the output side end surface 163b can be expanded in the circumferential direction, and the stator 11 can be stably supported.

(Modification 2)
FIG. 13 is a perspective view of the stator 11 of the second modification as viewed from the output side L1, and FIG. 14 is an exploded perspective view showing one of the stator core 51 and the plurality of insulators 52 of the second modification. As shown in FIG. 14, the stator core 51 of Modification 2 is different in the shape of the tip portion 359 of the salient pole portion 57 from the above form. The distal end portion 359 is formed with an auxiliary groove 360 extending in the direction of the axis L. A plurality of auxiliary grooves 360 are formed on the inner peripheral side end surface 357 a of each salient pole portion 57. In this embodiment, two auxiliary grooves 360 are formed on the inner peripheral side end surface 357a of each salient pole portion 57, but the number of auxiliary grooves 360 may be other than two. The inner peripheral side end surface 357a is equally divided in the circumferential direction by a plurality of auxiliary grooves 360. The auxiliary groove 360 is recessed from the inner peripheral side end surface 357a to the radially outer side with a constant depth, and the circumferential width is constant. Further, the auxiliary groove 360 extends from the edge on the output side L1 of the inner peripheral side end surface 357a to the edge on the counter-output side L2.

  The auxiliary groove 360 functions as a dummy slot for reducing the cogging torque of the motor 2. In the motor, an auxiliary groove called a dummy slot is provided on the radially inner end face of the salient pole part. The insulator 52 of Modification 2 shown in FIG. 14 assembles parts divided into two in the direction of the axis L in the same manner as in the above embodiment, but the insulator 52 is formed by insert molding by placing the stator core 51 in the mold. You can also

  In the insulator 52 of the second modification, the inner flange portion 362 includes a rib-like protrusion 364 extending in the axis L direction along the auxiliary groove 360. The rib-like protruding portion 364 protrudes radially inward from the auxiliary groove 360 because the radial thickness is larger than the depth of the auxiliary groove 360. In addition, the inner flange portion 362 of the second modification is along the first projecting portion 363 extending in the circumferential direction along the edge of the output side L1 of the tip end portion 359 and the edge of the counter output side L2 of the tip end portion 359. And a second protrusion 365 extending in the circumferential direction. The first protrusion 363 and the second protrusion 365 have the same circumferential width as the inner flange 362 in the circumferential direction. On the other hand, the first projecting portion 363 and the second projecting portion 365 have a smaller amount of projecting inward in the radial direction than the projecting portion 63 of the above configuration. In the second modification, the inner peripheral side end surface 363 a of the first projecting portion 363 and the inner peripheral side end surface 365 a of the second projecting portion 365 are located on the same plane as the inner peripheral side end surface 357 a of the salient pole portion 57.

  The rib-like projecting portion 364 projects radially inward from the first projecting portion 363 and the second projecting portion 365, and the inner peripheral side end surface 364 a of the rib-like projecting portion 364 is the inner peripheral side of the first projecting portion 363. The end surface 363a and the inner peripheral side end surface 365a of the second projecting portion 365 are located on the radially inner side. That is, the inner peripheral side end surface 364 a of the rib-like projecting portion 364 is located radially inward from the inner peripheral side end surface 357 a of the salient pole portion 57. The output side L1 end of the rib-like protrusion 364 is connected to the first protrusion 363, and the output-side end face 363b of the first protrusion 363 is connected to the output-side end face 364b of the rib-like protrusion 364 without a step. Yes. Further, the end face of the rib-like protruding portion 364 on the non-output side L2 contacts the second protruding portion 365 in the axis L direction.

  When positioning the stator 11 in the mold 100 in the mold 100, the output side end surface 364 b of the rib-shaped protrusion 364 is brought into contact with the support surface provided in the first mold 110 to perform positioning in the axis L direction. Do. For this purpose, the support surface on the first mold 110 side is provided at a position that coincides with the angular position of the rib-like protrusion 364. The rib-like projecting portion 364 has a larger dimension in the axis L direction than the projecting portion 63 of the above-described configuration, and both ends in the axis L direction are supported by the first projecting portion 363 and the second projecting portion 365. Further, since a part of the rib-like protruding portion 364 is accommodated in the auxiliary groove 360, the radial dimension (thickness) is larger by the depth of the auxiliary groove 360 than the protruding portion 63 of the above-described form. High strength. Therefore, the stator 11 can be stably supported by using the rib-like protruding portion 364 as the contact portion on the stator 11 side.

  In the second modification, when the cylindrical portion 144 of the first mold 110 is inserted into the inner peripheral side of the stator 11 and the radial positioning is performed, the inner peripheral side end surface 364a of the rib-like protruding portion 364 is the cylindrical portion 144. Positioning in the radial direction is performed by abutting on the outer peripheral surface. The inner peripheral side end surface 364a is an arcuate inner peripheral surface having an arcuate cross section when the axis L is cut by a vertical surface. As described above, the inner peripheral side end surface 357a of the salient pole portion 57 is in a position retracted radially outward from the inner peripheral side end surface 364a of the rib-like protruding portion 364. A gap is formed between the mold and the mold. Therefore, the completed resin sealing member 13 has a shape that completely covers the inner peripheral side end surface 357 a of the salient pole portion 57. In the modified example 2, the inner peripheral surface of the completed resin sealing member 13 exposes the inner peripheral side end surface 364a of the rib-like protruding portion 364, and part of the output-side end surface 364b of the rib-like protruding portion 364 is exposed. To do. That is, a part of the inner peripheral side end surface 364 a and the output side end surface 364 b of the rib-like projecting portion 364 becomes an exposed portion 370 exposed from the completed resin sealing member 13.

  As described above, in the second modification, the rib-like protruding portion 364 is provided by using the auxiliary groove 360 that functions as a dummy slot. By using the auxiliary groove 360, the radial thickness of the rib-like protruding portion 364 is secured and the strength thereof is increased without increasing the gap between the inner peripheral side end surface 357a of the salient pole portion 57 and the magnet 20. be able to.

DESCRIPTION OF SYMBOLS 1 ... Pump device, 2 ... Motor, 3 ... Case body, 4 ... Pump chamber, 5 ... Rotating shaft, 6 ... Impeller, 7 ... Inlet, 8 ... Discharge port, 10 ... Rotor, 11 ... Stator, 12 ... Housing, DESCRIPTION OF SYMBOLS 13 ... Resin sealing member, 14 ... Cover member, 15 ... 1st bearing member, 16 ... 2nd bearing member, 17 ... Through-hole, 20 ... Magnet, 21 ... Holding member, 24 ... E-ring, 30 ... Connector housing, DESCRIPTION OF SYMBOLS 40 ... Terminal pin, 45 ... 1st bearing plate, 46 ... 2nd bearing plate, 51 ... Stator core, 52 ... Insulator, 53 ... Coil, 54 ... Connector, 56 ... Annular part, 56a ... End face on the non-output side, 56b ... Output Side end face, 57 ... salient pole part, 57a ... inner peripheral side end face, 58 ... trunk part, 59 ... tip part, 60 ... cylindrical part, 61 ... outer flange part, 61a, 61b ... outer arcuate part, 61c ... wall 62, inside flange, 62a, 62b ... inside Wall part 63 ... Projection part 63a ... Arc-shaped inner peripheral surface 63b ... Output side end face 63b, 64 ... Opening part 65 ... Sealing member bottom part 66 ... Connector sealing part, 67 ... Sealing member cylinder part, 67a ... small diameter inner peripheral surface portion, 67b ... large diameter inner peripheral surface portion, 68 ... bearing member holding recess, 69 ... notched portion, 70 ... exposed portion, 81 ... large diameter cylindrical portion, 82 ... small diameter cylindrical portion, 82a ... first 1 small-diameter cylindrical portion, 82b ... second small-diameter cylindrical portion, 83 ... arc-shaped opening, notched portion ... 84, 85 ... engaging projection, 86 ... rotating engaging portion, 95 ... sealing member, 100 ... mold, 110 ... 1st mold, 120 ... 2nd mold, 130 ... Cavity, 140 ... Mold body, 141 ... Recess, 142 ... Sprue, 143 ... Runner, 144 ... Cylindrical part, 145 ... Outer peripheral support surface, 146, 147 ... Ribs, 148 ... Inner circumferential support surface, 150 ... Ejector pins, 151 Through hole, 160 ... mold body, 161 ... recess, 170 ... ejector pin, 171 ... through hole, 180 ... gate cut pin, 181 ... through hole, 190 ... pressing pin, 191 ... through hole, 263 ... projection, 263a ... arc-shaped inner peripheral surface, 263b ... output side end surface, 270 ... exposed portion, 357a ... inner peripheral side end surface, 359 ... tip portion, 360 ... auxiliary groove, 362 ... inner flange, 363 ... first protrusion, 363a ... Inner peripheral side end surface, 363b ... Output side end surface, 364 ... Rib-shaped protruding portion, 364a ... Inner peripheral side end surface, 364b ... Output side end surface, 365 ... Second protruding portion, 365a ... Inner peripheral side end surface, 370 ... Exposed portion, L ... Axis, L1 ... Output side, L2 ... Non-output side

Claims (9)

A rotor, a stator disposed on the outer peripheral side of the rotor, and a resin sealing member that covers the stator,
The stator includes a stator core and an insulator that covers the stator core,
The insulator includes a protruding portion that protrudes radially inward from the inner peripheral side end face of the salient pole portion provided in the stator core,
The inner peripheral side end face is covered with the resin sealing member,
The motor according to claim 1, wherein the protruding portion includes an exposed portion exposed from the resin sealing member. The protruding portion is disposed on one side in the axial direction with respect to the salient pole portion,
The motor according to claim 1, wherein the exposed portion includes an end surface facing the one side. The insulator includes an inner flange projecting to the one side of the salient pole part on the inner peripheral side of the coil wound around the salient pole part,
The motor according to claim 2, wherein the inner flange projects from the projecting portion toward the one side.   The motor according to claim 3, wherein the protrusion has a smaller width in the circumferential direction than the inner flange, and is disposed at the center in the circumferential direction of the inner flange.   The motor according to claim 3, wherein the protrusion has the same width in the circumferential direction as the inner flange. The inner peripheral side end surface is formed with a groove that divides the inner peripheral side end surface in the circumferential direction,
The motor according to claim 1, wherein the protrusion is disposed in the groove.   The motor according to any one of claims 1 to 6, wherein the projecting portion includes an arcuate inner peripheral surface having a cross-section cut in a plane perpendicular to the axial direction. The resin sealing member includes a sealing member bottom portion that covers the stator on the opposite side of the projecting portion in the axial direction with respect to the stator core,
8. The motor according to claim 1, wherein the bottom portion of the sealing member includes a through hole penetrating a portion overlapping with the opposite end face of the insulator in the axial direction. A motor according to any one of claims 1 to 8;
And an impeller attached to the rotating shaft of the rotor.

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