CN109962556B

CN109962556B - Motor and pump device

Info

Publication number: CN109962556B
Application number: CN201711430288.6A
Authority: CN
Inventors: 俞金杰; 山本岳; 原田雅贵
Original assignee: Nidec Sankyo Zhejiang Corp; Nidec Sankyo Corp
Current assignee: Nidec Sankyo Zhejiang Corp; Nidec Instruments Corp
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2024-04-12
Anticipated expiration: 2037-12-26
Also published as: JP2019118252A; CN109962556A

Abstract

A motor and a pump device are provided, wherein a connector is not contacted with a mounting surface when the motor is placed on the mounting surface. The motor comprises: a stator including coils arranged in a ring shape; a resin sealing member covering the coil; and a connector. The resin sealing member includes: a seal member bottom portion located on an output opposite side of the stator; and a connector sealing portion covering the connector from the output side. The sealing member bottom includes: a connector-side projection located between the axis and the connector; a first connector-side protruding portion located on the opposite side of the connector-side protruding portion so as to sandwich the axis. The front end surface of the connector-side protruding portion and the front end surface of the first connector-opposite-side protruding portion are located on an imaginary plane on the opposite output side from the connector. In the first connector opposite side protruding portion, a first side face facing one side in a circumferential direction around the axis and a second side face facing the other side are inclined faces.

Description

Motor and pump device

Technical Field

The invention relates to an electric motor comprising a connector for connecting an external cable. The present invention also relates to a pump device that drives an impeller by the above-described motor.

Background

Patent document 1 describes a pump device in which an impeller disposed in a pump chamber is rotated by a motor. In the above document, the motor includes: a rotor; a stator; a partition wall member that partitions the rotor and the stator; a resin sealing member covering the stator on the outer peripheral side of the partition wall member; and a connector. The rotor includes a permanent magnet. The stator includes a stator core and a plurality of coils wound around the stator core. The plurality of coils are arranged in a ring shape around a rotation center line of the rotor. The resin sealing member covers the stator, thereby preventing water or the like flowing through the pump chamber from contacting the coil.

The ends of the wires constituting the coils are connected to the connector. An external cable is connected to the connector from the outside in the radial direction perpendicular to the rotation center line. Power is supplied from an external cable to each coil via a connector. The connector is located on the outer peripheral side of the plurality of coils, and is covered with a resin sealing member from the inner side in the radial direction orthogonal to the rotation center line of the rotor.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication 2016-3580

Disclosure of Invention

Due to the installation environment of the motor, it is sometimes required to connect an external cable to the connector from the opposite side of the output of the motor. In this case, it is necessary to cover the connector with the resin sealing member from the output side and enable the external cable to be inserted into the connector from the opposite output side.

Here, when the connector is covered with the resin sealing member from the output side and the external cable is inserted into the connector from the opposite output side, a part of the connector is exposed to the opposite output side. Therefore, when the motor is placed on the table such that the opposite side of the motor to the output is positioned downward, the exposed portion of the connector may contact the mounting surface of the table, and the connector may be broken.

In view of this, the present invention has an object to provide a motor in which a connector does not come into contact with a mounting surface when the motor is placed on the mounting surface in a posture in which the opposite side to the output is positioned downward. Further, it is an object to provide a pump device in which the impeller is driven by the motor.

In order to solve the above technical problems, the motor of the present invention includes: a rotor; a stator including a plurality of coils arranged in a ring shape around a rotation center line of the rotor and surrounding the rotor; a connector which is located on the outer peripheral side of the plurality of coils, and which is detachably connected to an external cable for supplying electric power to the plurality of coils from the opposite output side when one side in the rotation center line direction is the output side and the other side is the opposite output side; and a resin sealing member that covers the coil, the resin sealing member including: an output-side seal portion located on the output-side opposite side of the rotor and the stator; and a connector sealing portion that covers the connector from the output side, the output-opposite-side sealing portion including: a connector-side protruding portion protruding toward the opposite output side between the rotation center line and the connector; and a connector-opposite-side protruding portion protruding toward the output-opposite side on a side opposite to the connector-side protruding portion so as to sandwich the rotation center line, wherein a front end surface of the connector-side protruding portion and a front end surface of the connector-opposite-side protruding portion are located on one virtual surface intersecting the rotation center line and located on the output-opposite side of the connector, and wherein in the connector-opposite-side protruding portion, a first side surface and a second side surface are inclined surfaces inclined toward a direction that the front end surfaces of the connector-opposite-side protruding portion approach each other as they approach each other, the first side surface is oriented to one circumferential side around the rotation center line, and the second side surface is oriented to the other circumferential side around the rotation center line.

According to the present invention, the resin sealing member covering the coil includes the output opposite side sealing portion located on the output opposite side of the rotor and the stator. Further, the opposite-output side sealing portion includes a connector side protruding portion protruding toward the opposite-output side between the rotation center line and the connector, and includes a connector opposite-side protruding portion on the opposite side from the connector side protruding portion in such a manner as to sandwich the rotation center line. The front end surface of the connector-side protruding portion and the front end surface of the connector-opposite-side protruding portion are located on the same virtual plane, and the virtual plane is located on the opposite output side from the connector. Therefore, when the motor is placed on the mounting surface of the table or the like in a posture in which the opposite side of the output of the motor is located downward, the motor is self-supporting in a posture in which the distal end surface of the connector-side protruding portion and the distal end surface of the connector-opposite-side protruding portion are brought into contact with the mounting surface (a posture in which the virtual surface coincides with the mounting surface). In the self-standing posture, the connector is positioned on the output side of the mounting surface (virtual surface). Therefore, the connector is not damaged by contact with the mounting surface. Further, the connector-side protruding portion is provided at a position closer to the connector than the rotation center line, and thus the connector can be reliably prevented from coming into contact with the mounting surface.

Here, in order to provide the protruding portion (the connector-side protruding portion and the connector-opposite-side protruding portion) on the resin sealing member, it is necessary to provide a relatively small recess corresponding to the protruding portion in a mold for molding the resin sealing member. However, in the case where the concave portion is provided in the mold, the resin injected into the mold does not smoothly flow into the concave portion, and there is a problem in that filling of the resin into the concave portion is liable to become insufficient. When the filling of the resin into the concave portion becomes insufficient, the protruding portion is easily deformed by sink marks at the time of molding. Further, if the protruding portion is deformed, the motor may be unstable when the motor is placed on the mounting surface in a posture where the opposite side to the output is located downward, and therefore the connector may be damaged by contact with the mounting surface. In view of the above, in the present invention, in the connector-opposite-side protruding portion, the first side surface facing one circumferential direction and the second side surface facing the other circumferential direction are inclined surfaces inclined in a direction in which the distal end surfaces of the connector-opposite-side protruding portion approach each other as they approach each other. Thus, the recess provided in the die for forming the connector-opposite-side protruding portion includes an inclined surface on the inner wall surface of the recess, and the inclined surface is inclined corresponding to the first side surface and the second side surface. Thus, the resin injected into the mold is guided by the inclined surface and smoothly flows into the concave portion. As a result, since the resin is reliably filled into the recess, deformation of the protruding portion on the opposite side of the connector due to sink marks during molding can be prevented or suppressed.

In the present invention, the following structure can be adopted: the opposite-connector-side protruding portion includes a first opposite-connector-side protruding portion and a second opposite-connector-side protruding portion, the second opposite-connector-side protruding portion being provided at a position separated from the first opposite-connector-side protruding portion in a circumferential direction, a distal end surface of the opposite-connector-side protruding portion being longer than a distal end surface of the first opposite-connector-side protruding portion and a distal end surface of the second opposite-connector-side protruding portion, respectively, in the circumferential direction, and an area of the distal end surface of the opposite-connector-side protruding portion being larger than an area of the distal end surface of the first opposite-connector-side protruding portion and an area of the distal end surface of the opposite-connector-side protruding portion, respectively. In this way, the connector-side protruding portion can be made larger than the first connector-opposite-side protruding portion and the second connector-opposite-side protruding portion, respectively. Here, if the connector-side protruding portion is large, a recess provided in the mold for forming the connector-side protruding portion can be increased. If the recess is large, the resin injected into the mold is likely to flow into the recess, and therefore deformation of the connector-side protruding portion due to sink marks during molding can be prevented or suppressed. In this way, the first connector-side protruding portion and the second connector-side protruding portion can be made smaller than the connector-side protruding portion, respectively. Thus, the amount of resin material used to mold the resin sealing member can be suppressed. Here, even in the case where the first connector-opposite-side protruding portion and the second connector-opposite-side protruding portion are made smaller, the resin can smoothly flow in because the concave portions for forming the first connector-opposite-side protruding portion and the second connector-opposite-side protruding portion in the mold include inclined surfaces for guiding the resin. Thus, deformation of the first connector-opposite-side protruding portion and the second connector-opposite-side protruding portion due to sink marks at the time of molding can be prevented or suppressed.

In the present invention, the following structure can be adopted: the first connector-opposite-side protruding portion includes a first extending portion extending from a first opposing portion opposing the second connector-opposite-side protruding portion toward the second connector-opposite-side protruding portion, the second connector-opposite-side protruding portion includes a second extending portion extending from a second opposing portion opposing the first connector-opposite-side protruding portion toward the first connector-opposite-side protruding portion, and a first protruding amount of the first extending portion decreases as approaching the second connector-opposite-side protruding portion, and a second protruding amount of the second extending portion decreases as approaching the first connector-opposite-side protruding portion. In this way, the resin injected into the mold and flowing into the recess for forming the first connector opposite side projection flows from the recess portion for forming the first extension portion to the recess side for forming the second connector opposite side projection.

Further, the above resin smoothly flows into the recess for forming the second connector opposite side protruding portion via the recess portion for forming the second extending portion. Further, the first extending portion and the second extending portion have a shape in which the protruding amount becomes smaller as going toward the tip end side, so that the amount of resin material used for molding the resin sealing member can be suppressed.

In the present invention, the following structure can be adopted: the first extending portion extends from an end of the first opposing portion on a side opposite to the side on which the connector-side protruding portion is located, and the second extending portion extends from an end of the second opposing portion on a side opposite to the side on which the connector-side protruding portion is located. In this way, in the case where the gate of the resin injection mold for molding the resin sealing member is provided between the recess for forming the connector-side protruding portion and the recess for forming the first connector-opposite-side protruding portion, the resin easily flows from the recess side for forming the first connector-opposite-side protruding portion to the recess side for forming the second connector-opposite-side protruding portion. Thus, the filling of the resin into the recess for forming the second connector opposite side protruding portion located at the position separated from the gate can be performed reliably. In addition, in the case where a gate of a resin injection mold for molding the resin sealing member is provided between the recess for forming the connector-side protruding portion and the recess for forming the second connector-opposite-side protruding portion, the resin is also easily flowed from the recess side for forming the second connector-opposite-side protruding portion to the recess side for forming the first connector-opposite-side protruding portion. Thus, the filling of the resin into the recess for forming the first connector opposite side protruding portion located at the position separated from the gate can be performed reliably.

In the present invention, it is preferable that the stator includes a stator core around which a plurality of coils including a U-phase coil, a V-phase coil, and a W-phase coil are wound, and the plurality of coils include a U-phase coil, a V-phase coil, and a W-phase coil, and the end portions of the U-phase wire, the V-phase wire, and the V-phase wire form the U-phase coil, the W-phase wire form the W-phase coil, and a connection portion at which the end portions of the U-phase wire, the V-phase wire, and the W-phase wire are connected to each other is located on the opposite side of the output of the stator core and overlaps with the protrusion on the opposite side of the first connector when viewed from the rotation center line direction. In this way, the resin sealing member has a larger thickness on the opposite output side of the connection portion connecting the end of the U-phase wire, the end of the V-phase wire, and the end of the W-phase wire, due to the provision of the first connector opposite side protruding portion. Thus, even in the case where the connection portion moves at the time of molding of the resin sealing member, the connection portion is prevented from being exposed to the outside from the resin sealing member.

Next, a pump device according to the present invention includes: the motor; a pump chamber; and an impeller disposed in the pump chamber, the rotor having an output shaft coaxial with the rotation center line, the output shaft extending from an outside of the pump chamber into the pump chamber, the impeller being connected to an end portion of the output shaft on the output side.

According to the present invention, when the pump device is placed on the mounting surface of the table or the like in a posture in which the opposite side of the output of the motor is located downward, the pump device is self-standing in a posture in which the distal end surface of the connector-side protruding portion of the resin sealing member of the motor and the distal end surface of the connector-opposite-side protruding portion are brought into contact with the mounting surface. In the self-standing posture, the connector is positioned on the output side of the mounting surface. Therefore, the connector is not damaged by contact with the mounting surface.

According to the motor of the present invention, when the motor is placed on a table or the like in a posture in which the opposite side to the output is positioned downward, the connector of the motor does not come into contact with the placement surface. In addition, even in the case of placing the pump device on the mounting surface of the table in a posture such that the opposite side of the output of the motor is located downward, the connector of the motor does not come into contact with the mounting surface. Thus, the connector can be prevented from being broken by contact with the mounting surface.

Drawings

Fig. 1 is an external perspective view of a pump device to which the present invention is applied.

Fig. 2 is a cross-sectional view of the pump device.

Fig. 3 is an exploded perspective view of the motor as seen from the output side.

Fig. 4 is an exploded perspective view of the motor as seen from the opposite side of the output.

Fig. 5 is an exploded perspective view of the motor with the cover member removed.

Fig. 6 (a) and 6 (b) are perspective views of the stator.

Fig. 7 (a) and 7 (b) are side and bottom views of the resin sealing member.

Fig. 8 is an explanatory diagram of an insert molding operation for forming the resin sealing member.

(symbol description)

1a pump device; 2, an electric motor; 3, a shell; 4 pump chambers; 5, an impeller; 6, an output shaft; 7, a suction inlet; 8, a discharge port; 10 rotors; a stator 11; a 12-shell; 13 a resin sealing member; 14 a cover member; 15 a first bearing member; a second bearing member 16; 18 an external cable; a 19 cable side connector; a 20 connector; 20a exposed portion; 25 magnets; 26 a retaining member; a 27E-ring; 28 a first bearing plate; 29 a second bearing plate; 31 stator core; 32 coils; 34 annular portion; 35 protruding pole parts; 35a inner peripheral side end face; 35b projecting pole part exposed part; a 37 insulator; 38a inner ledge; 38b outer eaves; 39 connection parts; 41 a connector housing; 42 terminal pins; 44U conductors (U phase conductors); 44V wire (V phase wire); 44W wire (W-phase wire); 45 common lines; 45a connecting portion; 47 frame parts; 48 closure; 49 extension parts; 50 an opening for locking; 51 dividing walls; 52 through holes; 53 ribs; 54 through holes; 61 an external connection; 62 a connecting portion; 63 coil wire connection parts; 63b bending part; 63a straight line portion; 64 struts; 65 sealing the bottom of the member; 65a opposite face; 66 sealing the member barrel; 67 connector seals; a bearing member retaining recess 68; 71 barrel portions; 72 eaves; 75 central protrusion; 76 annular projections; 77 annular surfaces; 78 conical surfaces; 79 annular end faces; 80 connector side protrusions; 80a front end face; 81a first connector opposite side projection; 81a front end face; 81b first side; 81c second side; 81d inner peripheral side surface (first opposing portion); 82 second connector opposite side projections; 82a front end face; 82b first side; 82c second side; 82d inner peripheral side surface (second opposing portion); 83 a first extension; 84 a second extension; 91 a large diameter cylinder part; 92 small diameter cylinder part; 93 arc-shaped openings; 94 annular end face; 95 locking protrusions; 96 small diameter inner peripheral surface portions; 97 large diameter inner peripheral surface portion; 98 opening portions; 99 notch portion; a 101 cap member top; 102 a cap member cylindrical portion; 103 through holes; 104 a circular recess; 105 a sealing member; 107 a bearing member holding cylinder; 108 outer annular ribs; 109 inner annular ribs; 110 inner ribs; 111 outer ribs; 115 an upper annular tube portion; 116 a lower annular cylinder; 117 annular steps; 117a annular surface; 118 is engaged with the portion; 120 die; 121 cavity; 123 gates; 125 connector side recesses; 126 a first connector opposite side recess; 127 second connector opposite side recess; 128. 129 inclined plane; 131 a first recess portion; 132 a second elongate recess portion; l axis (rotation center line); an L1 output side; l2 output opposite side; s imaginary plane.

Detailed Description

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

Fig. 1 is an external perspective view of a pump device to which the present invention is applied. Fig. 2 is a cross-sectional view of the pump device. Fig. 1 and 2 show the housing in dashed lines. As shown in fig. 1, the pump device 1 includes a motor 2 and a housing 3 attached to the motor 2. As shown in fig. 2, a pump chamber 4 is partitioned between the motor 2 and the housing 3. An impeller 5 is disposed in the pump chamber 4. The impeller 5 is mounted on a shaft end portion of an output shaft 6 of the motor 2, and the output shaft 6 extends from the motor 2 side (outside of the pump chamber 4) into the pump chamber 4. A fluid intake port 7 and a fluid discharge port 8 are provided in the housing 3. The suction port 7 is provided at a position overlapping with the axis L of the output shaft 6 of the motor 2. The discharge port 8 is provided in a direction orthogonal to the axis L.

In the present specification, as shown in fig. 1, the posture of the casing 3 above is referred to as a reference posture of the pump device 1, and the pump device 1 and the motor 2 will be described based on the reference posture. In the reference posture, the axis L of the output shaft 6 of the motor 2 extends in the up-down direction. In the motor 2, the side on which the output shaft 6 protrudes is an output side L1, and the side opposite to the output side L1 is an opposite output side L2. The direction perpendicular to the axis L is defined as a radial direction, and the direction around the axis L is defined as a circumferential direction. The axis L of the output shaft 6 is a rotation center line when the rotor 10 of the motor 2 rotates. The axis L direction is the rotation center line direction.

Fig. 3 is an exploded perspective view of the motor 2 when viewed from the output side. Fig. 4 is an exploded perspective view of the motor 2 when viewed from the opposite side of the output. In fig. 3 and 4, a cover member constituting a housing of the motor 2 is detached from the resin sealing member. Fig. 5 is an exploded perspective view of the motor 2 with the cover member removed. The motor 2 is a three-phase dc brushless motor. As shown in fig. 3, the motor 2 includes: a rotor 10, the rotor 10 including an output shaft 6; a stator 11; a housing 12, wherein the housing 12 accommodates the rotor 10 and the stator 11; and a connector 20, wherein the connector 20 is connected with the external cable 18.

The housing 12 includes: a resin sealing member 13, wherein the resin sealing member 13 covers the stator 11 from the output opposite side L2; and a cover member 14, wherein the cover member 14 covers the resin sealing member 13 from the output side L1. The cover member 14 is fixed to an end of the output side L1 of the resin sealing member 13. As shown in fig. 2, the resin sealing member 13 holds a first bearing member 15, and the first bearing member 15 supports the shaft portion of the output-opposite side L2 of the output shaft 6. The first bearing member 15 supports the shaft portion of the output shaft 6 to be movable in the direction of the axis L and rotatable about the axis L. As shown in fig. 4, the cover member 14 holds the second bearing member 16, and the second bearing member 16 supports the middle section of the output shaft 6. The second bearing member 16 supports the output shaft 6 to be movable in the direction of the axis L and rotatable about the axis L. The output shaft 6 penetrates the cover member 14 from the output opposite side L2 to the output side L1.

The cover member 14 is covered with the housing 3 from the output side L1. Thereby, the pump chamber 4 is partitioned between the cover member 14 and the housing 3. The output shaft 6 of the motor 2 extends from the outside of the pump chamber 4 into the pump chamber 4.

As shown in fig. 4, the connector 20 is covered with the resin sealing member 13 from the output side L1. The connector 20 includes an exposed portion 20a exposed from the resin sealing member 13 at an end portion on the opposite output side L2. As shown in fig. 1, a cable-side connector 19 of an external cable 18 is detachably connected to the connector 20 from the output-opposite side L2, and the external cable 18 supplies electric power to the motor 2.

When electric power is supplied from the external cable 18 to the motor 2 via the connector 20, the motor 2 is driven to rotate the impeller 5. When the impeller 5 rotates, fluid such as water sucked from the suction port 7 is discharged from the discharge port 8 through the pump chamber 4.

(rotor)

As shown in fig. 2, 3 and 5, the rotor 10 includes: an output shaft 6; a magnet 25, wherein the magnet 25 surrounds the output shaft 6; and a holding member 26, wherein the holding member 26 holds the output shaft 6 and the magnet 25. The magnet 25 is annular and is disposed coaxially with the output shaft 6. On the outer peripheral surface of the magnet 25, N poles and S poles are alternately magnetized in the circumferential direction. The output shaft 6 is made of stainless steel. As shown in fig. 2, an E-ring 27 is fixed to the central portion of the output shaft 6 in the direction of the axis L. The E-ring 27 is a metal plate-like member fitted into an annular groove formed in the output shaft 6. Further, an E-ring 27 is buried in an end portion of the output side L1 of the holding member 26.

Further, the rotor 10 includes: a first bearing plate 28, wherein the first bearing plate 28 is arranged on the output opposite side L2 of the holding member 26; and a second bearing plate 29, wherein the second bearing plate 29 is arranged on the output side L1 of the holding member 26. The first bearing plate 28 and the second bearing plate 29 are substantially annular metal plates. The first bearing plate 28 covers the end face of the holding member 26 on the opposite output side L2 in a state where the output shaft 6 passes through the center hole of the first bearing plate 28. The second bearing plate 29 covers the end surface of the output side L1 of the holding member 26 and the E-ring 27 in a state where the output shaft 6 passes through the center hole of the second bearing plate 29. The second bearing plate 29 is in surface contact with the E-ring 27. The first bearing plate 28 and the second bearing plate 29 are held by the end face of the holding member 26 on the opposite output side L2 and the end face of the holding member on the output side L1, respectively. When the rotor 10 rotates, the sliding heat generated by sliding the second bearing plate 29 and the second bearing member 16 is transmitted to the output shaft 6 via the E-ring 27 to dissipate heat.

(stator)

Fig. 6 (a) is a perspective view of the stator 11 viewed from the output side L1, and fig. 6 (b) is a perspective view of the stator 11 viewed from the opposite output side L2. The stator 11 includes: a stator core 31, wherein the stator core 31 is annular and is positioned on the outer peripheral side of the rotor 10; and a plurality of coils 32, wherein the plurality of coils 32 are wound around the stator core 31. The stator core 31 is a laminated core formed by laminating thin magnetic layers formed of a magnetic material. As shown in fig. 6 (a) and 6 (b), the stator core 31 includes: an annular portion 34; and a plurality of protruding pole portions 35 protruding radially inward from the annular portion 34. The plurality of protruding pole portions 35 are formed at equal angular intervals and arranged at fixed intervals in the circumferential direction. In this example, the plurality of protruding pole portions 35 are formed at an angular interval of 40 ° centering on the axis L. Thus, stator core 31 includes nine salient pole portions 35. The inner peripheral side end surface 35a of the protruding pole portion 35 is an arc surface centered on the axis L, and faces the outer peripheral surface of the magnet 25 of the rotor 10 with a small distance from the outer peripheral surface of the magnet 25 of the rotor 10.

The coils 32 are wound around the plurality of pole projections 35 through insulators 37. Thereby, the plurality of coils 32 are arranged in a ring shape around the axis and surround the rotor 10. Each insulator 37 is made of resin and has insulation properties. Each insulator 37 has a cylindrical shape with an edge. Each insulator 37 has an inner edge portion 38a and an outer edge portion 38b at both ends in the radial direction.

Here, among the plurality of insulators 37 respectively attached to the plurality of projecting portions 35, the insulator 37 located on the radially inner side of the connector 20 is integral with the connector housing 41 of the connector 20. That is, the insulator 37 closest to the connector 20 and the connector housing 41 are an integrally molded product formed of resin. As shown in fig. 6 (b), the insulator 37 integrally formed with the connector housing 41 includes a connecting portion 39, and the connecting portion 39 extends from the outer edge portion 38b toward the outer peripheral side along the lower end surface of the annular portion 34 of the stator core 31 and is continuous with the connector 20.

Each coil 32 wound around the salient pole portion 35 with the insulator 37 interposed therebetween protrudes outward in the radial direction (on the annular portion 34 side) toward the output side L1 and the output opposite side L2, respectively. The coil 32 is constituted by a wire formed of an aluminum alloy or a copper alloy. In this example, a wire in which an aluminum alloy is covered with a copper alloy is used. Here, the number of the protruding pole portions 35, the insulators 37, and the coils 32 is 9. The motor 2 is three-phase, three of the nine coils 32 are U-phase coils 32, three of the remaining six are V-phase coils 32, and the remaining three are W-phase coils 32. The U-phase coil 32, the V-phase coil 32, and the W-phase coil 32 are arranged in this order in the circumferential direction. In addition, the U-phase coil 32, the V-phase coil 32, and the W-phase coil 32 may be of other configurations.

The three U-phase coils 32 are formed by sequentially winding one wire 44 on the three salient pole portions 35, the three V-phase coils 32 are formed by sequentially winding one wire 44 on the three salient pole portions 35, and the three W-phase coils 32 are formed by sequentially winding one wire 44 on the three salient pole portions 35. As shown in fig. 6 (a), the wires 44 are wound around the protruding pole portions 35 via the outer peripheral side of the outer edge portion 38b of the insulators 37.

As shown in fig. 6 (b), three wires 44 constituting the U-phase coil 32, the V-phase coil 32, and the W-phase coil 32 are drawn toward the connector 20 at the output opposite side L2 of the stator core and toward the outer circumferential side to be connected to the terminal pins 42 of the connector 20. The end of the wire 44 (U-phase wire 44U) constituting the U-phase coil 32, the end of the wire 44 (V-phase wire 44V) constituting the V-phase coil 32, and the end of the wire 44 (W-phase wire 44W) constituting the W-phase coil 32 are connected to each other on the output opposite side L2 of the stator core to constitute a common wire 45. For example, three wires 44U, 44V, 44W are soldered to each other to form a common wire 45. Here, the end of the U-phase conductor 44U, the end of the V-phase conductor 44V, and the connection portion 45a at which the end of the W-phase conductor 44W are connected to each other are located on the opposite side of the connector 20 with the axis L interposed therebetween.

As shown in fig. 2 and 6 (a) and 6 (b), the connector 20 includes: a connector housing 41, wherein the connector housing 41 and the insulator 37 are integrally formed; and three terminal pins 42, the three terminal pins 42 being supported by the connector housing 41. The connector 20 is located on the outer peripheral side of the plurality of coils 32 arranged in a ring shape.

As shown in fig. 6 (a) and 6 (b), the connector housing 41 includes: a frame 47, the frame 47 extending along the axis L; a closing portion 48, wherein the closing portion 48 closes an opening of the output side L1 of the frame 47; and an extension portion 49, wherein the extension portion 49 extends from the frame portion 47 and the closing portion 48 to the stator core 31 side. The male cable-side connector 19 is detachably inserted into the frame 47 from the opposite-output side L2. An exposed portion 20a is provided at an end portion of the frame portion 47 on the opposite side L2 to be output, and the exposed portion 20a is exposed to the outside from the resin sealing member 13. When the cable-side connector 19 of the external cable 18 includes a hook, the exposed portion 20a is provided with an engaging opening 50 for engaging the hook. The connection portion 39 of the insulator 37 continues from the inner peripheral side to the extension portion 49.

As shown in fig. 6 (b), the outline shape of the frame 47 is rectangular when viewed from the axis L direction, and the longitudinal direction of the frame 47 is oriented in the circumferential direction. Two partition walls 51 are provided inside the frame 47, and the two partition walls 51 partially divide the inner space of the frame 47 into three spaces in the circumferential direction. In the closing portion 48, through holes 52 are provided in portions located in the respective spaces partitioned by the partition wall 51, respectively, and the through holes 52 penetrate in the axis L direction.

The extension portion 49 includes two ribs 53, and the two ribs 53 protrude toward the opposite-output side L2 and extend from the frame portion 47 toward the annular portion 34 side of the stator core 31. Each rib 53 is located on the inner peripheral side of each partition wall 51 inside the frame 47. As shown in fig. 6 (a), in the extending portion 49, through holes 54 penetrating in the axis L direction are provided in a portion between the two ribs 53, a portion on one side of the rib 53 on the one circumferential side out of the two ribs 53, and a portion on the other side of the rib 53 on the other circumferential side out of the two ribs 53, respectively. The through holes 54 are located on the inner peripheral side of the through holes 52 provided in the closing portion 48.

Each terminal pin 42 is formed by bending a metal wire having a quadrangular cross-sectional shape. As shown in fig. 2, the terminal pin 42 includes: an external connection portion 61, wherein the external connection portion 61 penetrates the through hole 52 of the closing portion 48 from the output side L1 to the opposite output side L2, and extends inside the frame portion 47; a connecting portion 62, the connecting portion 62 extending from an upper end of the external connecting portion 61 toward the annular portion 34 side (insulator 37 side) of the stator core 31 along an upper surface of the extension portion 49; and a coil wire connection portion 63, wherein the coil wire connection portion 63 penetrates the through hole 54 of the extension portion 49 from the output side L1 to the opposite output side L2 from the end portion of the connection portion 62 on the annular portion 34 side. Each terminal pin 42 is pressed into the through hole 52 of the closing portion 48 and the through hole 54 of the extending portion 49. Thereby, the three terminal pins 42 are arranged at equal intervals in the circumferential direction.

The external connection portions 61 of the terminal pins 42 are located in three spaces partitioned inside the frame portion 47 by the partition wall 51, respectively. The external connection portions 61 of the respective terminal pins 42 are prevented from contacting each other by the partition wall 51. When the cable-side connector 19 is connected to the connector 20, the external connection portion 61 is electrically connected to the cable 18. Further, among the three coil wire connecting portions 63, the rib 53 exists between two coil wire connecting portions 63 adjacent in the circumferential direction. Thereby, the coil connecting portions 63 are prevented from coming into contact with each other. The coil wire connection portion 63 includes: a linear portion 63a, the linear portion 63a extending linearly from the coupling portion 62 toward the opposite output side L2 and reaching the opposite output side L2 of the stator 11; and a bending portion 63b, wherein the bending portion 63b bends from the linear portion 63a toward the stator 11.

Here, as shown in fig. 6 (b), four struts 64 separated in the circumferential direction are provided at the connection portion 39 of the insulator 37. Three wires 44 constituting the U-phase coil 32, the V-phase coil 32, and the W-phase coil 32 are pulled out toward the connector 20 and toward the outer periphery side on the output opposite side L2 of the stator core 31. The three wires 44 are drawn around so as to contact the side surfaces of three posts 64 among the four posts 64, and are connected to the coil wire connection portions 63 of the three terminal pins 42, respectively. The bent portion 63b is a drop-preventing portion that prevents the coil 32 wire from dropping off from the terminal pin 42.

(resin sealing Member)

Next, the resin sealing member 13 will be described. Fig. 7 (a) is a side view of the resin sealing member 13 as seen from a direction orthogonal to the axis L, wherein the resin sealing member 13 covers the coil 32, the insulator 37, and the stator core 31. Fig. 7 (b) is a bottom view of the resin sealing member 13 as seen from the output opposite side L2, the resin sealing member 13 covering the coil 32, the insulator 37, and the stator core 31.

As shown in fig. 4 and 5, the resin sealing member 13 includes: a seal member bottom 65 (output-opposite-side seal portion), the seal member bottom 65 having a disk shape and covering the coil 32, the insulator 37, and the stator core 31 from the output-opposite side L2; a seal member cylindrical portion 66, the seal member cylindrical portion 66 extending from the seal member bottom portion 65 to the output side L1; and a connector seal portion 67, the connector seal portion 67 protruding from the seal member tube portion 66 to the outer peripheral side. The resin sealing member 13 covers the coil 32 and the insulator 37. The resin sealing member 13 covers the outer peripheral edge portion of the stator core 31 excluding the upper surface of the annular portion 34 and the end portion on the inner peripheral side of the salient pole portion 35.

As shown in fig. 5, a bearing member holding recess 68 is provided in an opposing surface 65a of the seal member bottom 65 opposing the rotor 10 on the inner side of the stator core 31, and the bearing member holding recess 68 holds the first bearing member 15. Here, the first bearing member 15 includes: a tube portion 71, wherein the tube portion 71 has a center hole through which the output shaft 6 passes; and an overhang portion 72, wherein the overhang portion 72 extends from the upper end of the tube portion 71 to the outer peripheral side. The cylindrical portion 71 of the first bearing member 15 is inserted into the bearing member holding recess 68. The first bearing member 15 is fixed to the bearing member holding recess 68 so that the brim 72 comes into contact with the facing surface 65a of the seal member bottom 65 from the output side L1. As shown in fig. 2, in a state where the first bearing member 15 is fixed to the bearing member holding recess 68, the eave 72 is orthogonal to the axis L. When the rotor 10 is supported by the first bearing member 15, the shaft end portion of the output shaft 6 penetrates the cylindrical portion 71. The eave 72 is in sliding contact with the first bearing plate 28 of the rotor 10 from the output opposite side L2.

As shown in fig. 1, 4, 7 (a), and 7 (b), a central protruding portion 75 and an annular protruding portion 76 are provided on the lower surface side of the seal member bottom portion 65, wherein the central protruding portion 75 is cylindrical and protrudes from the central portion of the seal member bottom portion 65 toward the opposite-output side L2, and the annular protruding portion 76 protrudes toward the opposite-output side L2 on the outer peripheral side of the central protruding portion 75 so as to surround the central protruding portion 75. An annular surface 77 orthogonal to the axis L is provided between the central protruding portion 75 and the annular protruding portion 76. The center protruding portion 75 overlaps with the bearing member holding recess 68 in the axis L direction. The axis L passes through the center of the central protrusion 75. The annular protrusion 76 includes: a tapered surface 78, the tapered surface 78 having a ring shape and being inclined from the ring surface 77 toward the output opposite side L2; and an annular end surface 79, wherein the annular end surface 79 extends from the tapered surface 78 toward the outer circumferential side in a direction orthogonal to the axis L.

The annular end surface 79 is provided with a connector-side protruding portion 80 at an outer peripheral portion radially outward where the connector 20 is located, and the connector-side protruding portion 80 protrudes toward the opposite-output side L2. The connector-side protruding portion 80 is provided between the axis L and the connector 20 at a position close to the connector 20. The shape of the front end surface 80a of the connector-side protruding portion 80 is a rectangular shape long in the circumferential direction. The length of the connector-side protruding portion 80 in the circumferential direction is longer than the length of the connector 20 (frame portion 47) in the circumferential direction.

Further, the annular end surface 79 is provided with a first connector-opposite-side protruding portion 81 and a second connector-opposite-side protruding portion 82 protruding toward the output-opposite side L2 at an outer peripheral portion located opposite to the connector-side protruding portion 80 so as to sandwich the axis L. The second connector opposite side protruding portion 82 is provided at a position separated from the first connector opposite side protruding portion 81 in the circumferential direction. In this example, the first connector opposite side protruding portion 81 and the second connector opposite side protruding portion 82 are separated at an angular interval of 90 ° or more about the axis L.

The first connector opposite side protruding portion 81 and the second connector opposite side protruding portion 82 extend along the outer peripheral edge of the annular end face 79, respectively. The front end surface 81a of the first connector opposite side protruding portion 81 and the front end surface 82a of the second connector opposite side protruding portion 82 are each in a parallelogram shape. Here, the first connector-opposite-side protruding portion 81 and the second connector-opposite-side protruding portion 82 are smaller than the connector-side protruding portion 80, respectively. That is, the front end surface 81a of the first connector-opposite-side protruding portion 81 and the front end surface 82a of the second connector-opposite-side protruding portion 82 are each shorter than the front end surface 80a of the connector-side protruding portion 80 in the circumferential direction. Further, the area of the front end surface 81a of the first connector-opposite-side protruding portion 81 and the area of the front end surface 82a of the second connector-opposite-side protruding portion 82 are smaller than the area of the front end surface 80a of the connector-side protruding portion 80, respectively. In other words, the connector-side protruding portion 80 is longer than the front end surface 81a of the first connector-opposite-side protruding portion 81 and the front end surface 82a of the second connector-opposite-side protruding portion 82 in the circumferential direction, respectively, and the area of the front end surface 80a of the connector-side protruding portion 80 is larger than the area of the front end surface 81a of the first connector-opposite-side protruding portion 81 and the area of the front end surface 82a of the second connector-opposite-side protruding portion 82, respectively.

In the first connector opposite side protruding portion 81, the first side surface 81b and the second side surface 81c are inclined surfaces inclined in a direction approaching each other as the front end surface 81a is closer, wherein the first side surface 81b faces one circumferential side (toward the connector side protruding portion 80 side), and the second side surface 81c faces the other circumferential side (toward the opposite side to the connector side protruding portion 80). The first side surface 81b is inclined at a larger angle with respect to the annular end surface 79 than the second side surface 81c is inclined at a larger angle with respect to the annular end surface 79. Similarly, in the second connector opposite side protruding portion 82, the first side surface 82b and the second side surface 82c are inclined surfaces inclined in a direction approaching each other as the front end surface 82a is closer, wherein the first side surface 82b faces one circumferential side (toward the connector side protruding portion 80 side), and the second side surface 82c faces the other circumferential side (toward the opposite side to the connector side protruding portion 80). The first side surface 82b is inclined at a larger angle with respect to the annular end surface 79 than the second side surface 82c is inclined at a larger angle with respect to the annular end surface 79.

Further, the first connector opposite side projecting portion 81 includes a first extending portion 83, and the first extending portion 83 extends from an inner peripheral side surface 81d (first opposing portion) opposing the second connector opposite side projecting portion 82 to the second connector opposite side projecting portion 82 side. Further, the second connector opposite side projecting portion 82 includes a second extending portion 84, and the second extending portion 84 extends from an inner peripheral side surface 82d (second opposite portion) opposite to the first connector opposite side projecting portion 81 side. The first extension 83 extends from an end of the inner peripheral side surface of the first connector-opposite-side protruding portion 81 on the opposite side to the side on which the connector-side protruding portion 80 is located. On the other hand, the second extension portion 84 extends from an end of the inner peripheral side surface of the second connector-opposite-side protruding portion 82 on the opposite side to the side on which the connector-side protruding portion 80 is located. Further, the first extension 83 and the second extension 84 extend along the edges of the inner peripheral side of the annular end face 79, respectively. The front end of the first extension 83 is opposed to the front end of the second extension 84 with a gap therebetween.

The cross-sectional shapes of the first extension 83 and the second extension 84 cut in the directions intersecting the respective extension directions are triangular shapes with the tip end thereof tapered toward the opposite output side L2. Further, the first projecting amount of the first extension 83 from the annular end surface 79 becomes smaller as approaching the second connector opposite side projecting portion 82. Also, the second projecting amount of the second extension portion 84 projecting from the annular end surface 79 becomes smaller as approaching the first connector opposite side projecting portion 81.

As is apparent from a comparison between fig. 4 and 6 (b), the first connector opposite side protruding portion 81 is provided at a position overlapping with the output opposite side L2 of the connection portion 45a where the end of the wire 44U, the end of the wire 44V, and the end of the wire 44W are connected to each other, wherein the wire 44U forms the U-phase coil 32, the wire 44V forms the V-phase coil 32, and the wire 44W forms the W-phase coil 32. That is, the connection portion 45a overlaps with the first connector opposite side protruding portion 81 when viewed from the axis L direction. As shown in fig. 2, 7 (a) and 7 (b), the front end surface 80a of the connector-side protruding portion 80, the front end surface 81a of the first opposite-connector-side protruding portion 81, and the front end surface 82a of the second opposite-connector-side protruding portion 82 are located on one virtual plane S intersecting the axis L at a position closer to the opposite-output side L2 than the central protruding portion 75 and the connector 20. In this example, the virtual plane S is orthogonal to the axis L.

Next, as shown in fig. 5, the sealing member tube 66 includes a large-diameter tube 91 and a small-diameter tube 92 from the output side L2 to the output side L1, and the outer diameter of the small-diameter tube 92 is smaller than the outer diameter of the large-diameter tube 91. The outer diameter of the large diameter cylindrical portion 91 is larger than the outer diameter of the annular portion 34 of the stator core 31, and the outer diameter of the small diameter cylindrical portion 92 is smaller than the outer diameter of the annular portion 34 of the stator core 31.

A plurality of circular arc-shaped openings 93 are provided at the boundary portion between the large diameter tube portion 91 and the small diameter tube portion 92 of the seal member tube portion 66, and the plurality of circular arc-shaped openings 93 expose the outer peripheral edge portion of the annular portion 34 of the stator core 31 from the resin seal member 13 to the output side L1. An annular end surface 94 orthogonal to the axis L is provided on the outer peripheral side of the arcuate opening 93 of the resin sealing member 13. The exposed portion of the stator core 31 exposed from the circular-arc opening 93 is located on the same plane orthogonal to the axis L as the annular end surface 94. Four locking projections 95 protruding toward the outer peripheral side are provided at equal angular intervals at the upper end portion of the large-diameter cylindrical portion 91.

The inner peripheral surface of the seal member tube 66 is provided with a small-diameter inner peripheral surface portion 96 and a large-diameter inner peripheral surface portion 97 from the output opposite side L2 to the output side L1, and the inner diameter dimension of the large-diameter inner peripheral surface portion 97 is larger than the inner diameter dimension of the small-diameter inner peripheral surface portion 96. The radius of curvature of the small-diameter inner peripheral surface portion 96 is substantially equal to the radius of curvature of the inner peripheral side end surface 35a of the protruding pole portion 35. The small-diameter inner peripheral surface portion 96 is provided with a plurality of openings 98, and the plurality of openings 98 expose the inner peripheral side end surfaces 35a of the respective salient pole portions 35 of the stator core 31 to the inner peripheral side. Further, a notch 99 is provided in the small-diameter inner peripheral surface portion 96, and the notch 99 exposes an end portion on the inner peripheral side of each of the protruding pole portions 35 to the output side L1. Each notch 99 is formed in a groove shape extending from the edge of the opening 98 in the direction of the axis L to the upper end edge of the small-diameter inner peripheral surface portion 96. By providing the plurality of notches 99, a central portion of the upper surface of the inner peripheral side end portion of each protruding electrode portion 35 in the circumferential direction becomes a protruding electrode portion exposure portion 35b, and the protruding electrode portion exposure portion 35b is exposed to the output side L1.

The inner peripheral side end surface 35a of each protruding electrode portion 35 exposed from the opening 98 is continuous with the small diameter inner peripheral surface portion 96 without a step. An antirust agent is applied to the inner peripheral end surface 35a of each protruding electrode portion 35 exposed from the opening 98. Further, rust inhibitor is also applied to the protruding electrode portion exposed portion 35b of each protruding electrode portion 35 exposed from the notch portion 99. Rust inhibitors are, for example, epoxy paints.

As shown in fig. 4, the connector sealing portion 67 covers the connector 20 from the output side L1, and exposes a part (exposed portion 20 a) of the opposite output side L2 of the connector 20 from the resin sealing member 13 to the outside. Here, as shown in fig. 2, the lower end of the connector 20 (frame 47) exposed from the resin sealing member 13 to the opposite-output side L2 does not protrude from the virtual plane S to the opposite-output side L2 (downward). That is, the virtual plane S is located on the opposite output side L2 from the connector 20.

The resin sealing member 13 is formed of BMC (Bulk Molding Compound: bulk molding compound). In this example, the stator 11 and the connector 20 are disposed in the mold 120, and the resin is injected into the mold 120 and cured, thereby forming the resin sealing member 13. That is, the resin sealing member 13 is integrally molded with the stator 11 and the connector 20 by insert molding. The details of the insert molding will be described later.

(cover Member)

The cover member 14 is made of resin and is fixed to the output side L1 of the resin sealing member 13. As shown in fig. 3 and 4, the cover member 14 includes: a disk-shaped cover member top 101; and a lid member cylindrical portion 102, the lid member cylindrical portion 102 extending from an outer peripheral side of the lid member top portion 101 to an opposite-output side L2.

As shown in fig. 3, the lid top 101 includes a through hole 103, and the through hole 103 penetrates the center in the direction of the axis L. The through hole 103 is located at a position overlapping with the bearing member holding recess 68 of the resin seal member 13 when viewed from the axis L direction. A circular recess 104 surrounding the through hole 103 is provided in a central portion of the upper surface of the lid member top 101. The annular seal member 105 is inserted into the circular recess 104 from the output side L1 and fixed.

As shown in fig. 4, a bearing member holding cylinder 107 is provided on the surface of the lid member top 101 on the opposite side L2 to the output side, and the bearing member holding cylinder 107 is coaxial with the through hole 103 at the center portion of the lid member top 101. The center hole of the bearing member holding cylinder 107 is a through hole 103. Further, an outer annular rib 108 is provided on the lower surface of the lid member top 101 along the circular outer periphery thereof. Further, a circular inner annular rib 109 is provided between the bearing member holding tube 107 and the outer annular rib 108 on the lower surface of the lid member top 101. An inner rib 110 is provided between the bearing member holding tube 107 and the inner annular rib 109, and the inner rib 110 extends radially from the bearing member holding tube 107 to the inner annular rib 109. An outer rib 111 is provided between the inner annular rib 109 and the outer annular rib 108, and the outer rib 111 extends radially from the inner annular rib 109 to the outer annular rib 108. The bearing member holding cylinder 107 is coaxial with the outer annular rib 108 and the inner annular rib 109. The lower end surface of the bearing member holding cylinder 107, the lower end surface of the outer annular rib 108, and the lower end surface of the inner annular rib 109 are planes orthogonal to the axis L.

The amount of protrusion of the bearing member holding cylinder 107 from the surface of the opposite-output side L2 of the cover member top 101 is larger than the amount of protrusion of the inner annular rib 109 from the surface of the opposite-output side L2 of the cover member top 101. The surface of the opposite-output side L2 of the inner rib 110 is on the same plane as the surface of the opposite-output side L2 of the inner annular rib 109. The protrusion amount of the inner annular rib 109 from the surface of the opposite-output side L2 of the lid member top 101 is larger than the protrusion amount of the outer annular rib 108 from the surface of the opposite-output side L2 of the lid member top 101. The surface of the opposite-output side L2 of the outer rib 111 is on the same plane as the surface of the opposite-output side L2 of the outer annular rib 108.

The second bearing member 16 is held in the center hole of the bearing member holding cylinder portion 107. Here, the second bearing member 16 is a member in which the same members as the first bearing member 15 shown in fig. 5 are disposed upside down. Thus, the second bearing member 16 includes: a tube portion 71, wherein the tube portion 71 has a center hole through which the output shaft 6 passes; and an overhang portion 72, wherein the overhang portion 72 extends from the lower end of the tube portion 71 to the outer peripheral side. The second bearing member 16 is fixed to the bearing member holding tube 107 by abutting the eave 72 against the bearing member holding tube 107 from the output opposite side L2. In a state where the second bearing member 16 is fixed to the bearing member holding tube portion 107, an end surface of the output opposite side L2 of the eave portion 72 is orthogonal to the axis L.

The second bearing member 16 supports the rotor 10 in a state where the output shaft 6 penetrates. The cylindrical portion 71 of the second bearing member 16 supports the output shaft 6 (rotor 10) so as to be movable in the direction of the axis L and rotatable about the axis L. The eave 72 is in sliding contact with the second bearing plate 29 of the rotor 10 from the output side L1. Thus, when the rotor 10 rotates, the rotor 10 moves in the direction of the axis L between a lower position where the first bearing plate 28 of the rotor 10 is in sliding contact with the eave portion 72 of the first bearing member 15 and an upper position where the second bearing plate 29 of the rotor 10 is in sliding contact with the eave portion 72 of the second bearing member 16.

As shown in fig. 3 and 4, the lid member tubular portion 102 extends from the outer periphery side of the outer annular rib 108 to the opposite-output side L2. As shown in fig. 2, the cover member cylindrical portion 102 includes: an upper annular tube portion 115, wherein the upper annular tube portion 115 overlaps the small-diameter tube portion 92 of the resin sealing member 13 and covers the same from the outer peripheral side; and a lower annular tube 116, wherein the lower annular tube 116 is located below the upper annular tube 115 and on the outer periphery of the large-diameter tube 91. As shown in fig. 4, an annular step 117 is provided between the upper annular tube 115 and the lower annular tube 116 on the inner peripheral surface of the lid member tube 102. The annular step 117 includes an annular surface 117a facing the opposite output side L2. The annular surface 117a is a plane orthogonal to the axis L. The lower annular tube 116 is provided with engaged portions 118 at four positions in the circumferential direction, and the engaged portions 118 are engaged with the engaging protrusions 95 of the resin sealing member 13.

Here, the cover member 14 covers the resin sealing member 13 from the output side L1 in a state where the rotor 10 is disposed inside the resin sealing member 13 and the rotor 10 is supported by the first bearing member 15. When the cover member 14 is covered with the resin sealing member 13, an adhesive is applied to the outer peripheral edge portion of the upper surface of the resin sealing member 13.

As shown in fig. 2, when the cover member 14 is covered with the resin sealing member 13, the output shaft 6 is inserted through the cylindrical portion 71 of the second bearing member 16 held by the cover member 14, and the lower end portion of the inner annular rib 109 is fitted into the inner peripheral side of the sealing member cylindrical portion 66 of the resin sealing member 13. Thereby, the cover member 14 and the resin sealing member 13 are positioned in the radial direction, and the axis L of the output shaft 6 coincides with the central axis of the stator 11. Further, the annular surface 117a of the annular stepped portion 117 of the cap member cylindrical portion 102 is brought into contact with the annular end surface 94 between the large diameter cylindrical portion 91 and the small diameter cylindrical portion 92 of the resin sealing member 13. Thereby, the cover member 14 and the resin sealing member 13 are positioned in the axis L direction. Thereafter, the cover member 14 and the resin sealing member 13 are rotated relative to each other in the circumferential direction, and as shown in fig. 1, the locking protrusion 95 of the resin sealing member 13 is engaged with the locked portion 118 of the cover member 14. Thereby, the cover member top 101 covers the rotor 10 and the resin sealing member 13 from the output side L1 in a state where the output shaft 6 is penetrated in the axis L direction. The output shaft 6 penetrates a seal member 105 disposed in the circular recess 104 of the cover member top 101. The sealing member 105 seals between the output shaft 6 and the cover member 14. Further, the upper annular tube portion 115 of the lid member tube portion 102 surrounds the small-diameter tube portion 92 of the resin sealing member 13 from the outer peripheral side.

When the cover member 14 is fixed to the resin sealing member 13, the rotor 10 is supported by the first bearing member 15 and the second bearing member 16 so as to be movable in the direction of the axis L between a lower position in sliding contact with the upper end surface of the eave portion 72 of the first bearing member 15 and a lower position in sliding contact with the lower end surface of the eave portion 72 of the second bearing member 16, and rotatable about the axis L.

Here, the upper end portion of the output shaft 6 is connected to the impeller 5. Thereafter, the housing 3 is covered with the cover member 14 from the output side L1. Thereby, the space defined between the cover member 14 and the housing 3 becomes the pump chamber 4, and the impeller 5 is disposed in the pump chamber 4.

(molding of resin sealing Member)

Fig. 8 is an explanatory diagram of the molding operation of the resin sealing member 13. The stator 11 is placed in the mold 120, and the resin is injected into the mold 120 and cured, thereby forming the resin sealing member 13. That is, the resin sealing member 13 is integrally molded with the stator 11 by insert molding. Here, as shown in fig. 8, the mold 120 is provided with a cavity 121, and the cavity 121 corresponds to the shape of the resin sealing member 13. The cavity 121 has a shape that turns the resin sealing member 13 upside down. That is, the cavity 121 has a shape in which the opposite-to-output side L2 of the resin sealing member 13 is located on the upper side after molding. Accordingly, a connector side concave portion 125, a first connector opposite side concave portion 126, and a second connector opposite side concave portion 127 are provided on the top surface of the cavity 121, wherein the connector side concave portion 125 corresponds to the connector side protruding portion 80, the first connector opposite side concave portion 126 corresponds to the first connector opposite side protruding portion 81, and the second connector opposite side concave portion 127 corresponds to the second connector opposite side protruding portion 82. In the insert molding, the stator 11 is disposed in the cavity 121 in a state of being turned upside down. That is, in the cavity 121, the stator 11 is in an upside-down posture in which the output side L1 is directed downward and the opposite output side L2 is directed upward.

Here, as shown in fig. 5, in this example, the inner peripheral side end surfaces 35a of the respective salient pole portions 35 of the stator core 31 are exposed from the resin sealing member 13 to the inner peripheral side. Accordingly, in insert molding, a cylindrical mold portion protruding into the cavity 121 is provided in the mold 120, and the outer peripheral surface of the mold portion is brought into contact with the inner peripheral side end surface 35a of each of the salient pole portions 35, thereby positioning the stator core 31 in the radial direction. In this example, the salient pole portion exposed portions 35b of the salient pole portions 35 of the stator core 31 are exposed from the resin sealing member 13 to the output side L1. Further, a plurality of arcuate openings 93 are provided in the resin sealing member 13, and the outer peripheral edge portion of the annular portion 34 of the stator core 31 is exposed to the output side L1. Accordingly, in the insert molding, a first abutting portion capable of abutting against the projecting pole portion exposed portion 35b of each projecting pole portion 35 of the stator core 31 in the inverted posture from below and a second abutting portion capable of abutting against the outer peripheral edge portion of the annular portion 34 from below are provided on the mold 120, and the first abutting portion and the second abutting portion are made to abut against the stator core 31, so that the stator core 31 is positioned in the axis L direction. As a result, in this example, the resin is injected into the mold 120 in a state where the stator core 31 disposed in the mold 120 is positioned in the radial direction and the axial direction L, and the resin sealing member 13 can be molded. Thus, the accuracy of the relative position of the stator core 31 and the resin sealing member 13 is improved.

Here, a gate 123 for injecting resin into the mold 120 (inside the cavity 121) is provided at an angular position between the connector-side protruding portion 80 and the first connector-opposite-side protruding portion 81 in the molded resin sealing member 13. In other words, the gate 123 is provided between the connector side concave portion 125 in the mold 120 for forming the connector side protruding portion 80 and the first connector opposite side concave portion 126 for forming the first connector opposite side protruding portion 81. Further, the gate 123 is provided at a lower side portion of the cavity 121 (an upper side portion of the molded resin sealing member 13).

When the resin is injected from the gate 123, the resin flows in the cavity 121 toward both sides in the circumferential direction about the axis L and flows upward as indicated by arrow marks in fig. 8. Here, in the case where relatively small recesses such as the first connector opposite side recess 126 and the second connector opposite side recess 127 are provided in the mold 120, the resin injected into the mold 120 does not smoothly flow into the recesses, and there is a problem in that filling of the resin into the recesses is liable to become insufficient. When the filling of the resin into the concave portion becomes insufficient, the protruding portion corresponding to the concave portion is easily deformed by sink marks at the time of molding.

In order to solve the above-described problem, in this example, in the first connector opposite side protruding portion 81, the first side surface 81b and the second side surface 81c are inclined surfaces inclined in a direction toward the front end surface 81a of the first connector opposite side protruding portion 81 so as to approach each other, wherein the first side surface 81b is directed to one circumferential side and the second side surface 81c is directed to the other circumferential side. Similarly, in the second opposite-connector side protruding portion 82, the first side surface 82b and the second side surface 82c are inclined surfaces inclined in a direction toward the front end surface 82a of the second opposite-connector side protruding portion 82, which is closer to each other, wherein the first side surface 82b is directed to one circumferential side and the second side surface 82c is directed to the other circumferential side. Accordingly, the first connector opposite side concave portion 126 provided in the die 120 for forming the first connector opposite side protruding portion 81 has inclined surfaces 128 and 129 on the inner wall surface thereof, and the inclined surfaces 128 and 129 are inclined in correspondence with the first side surface 81b and the second side surface 81 c. Similarly, the second opposite-connector recess 127 provided in the die 120 for forming the second opposite-connector projection 82 has inclined surfaces 128 and 129 on the inner wall surface thereof, and the inclined surfaces 128 and 129 are inclined in correspondence with the first side surface 82b and the second side surface 82 c. Thus, the resin injected into the mold 120 is guided by the inclined surfaces 128 and 129, and smoothly flows into the first and second opposite-connector recesses 126 and 127. As a result, the resin is reliably filled into the first and second opposite-connector recesses 126 and 127, and therefore deformation of the first and second opposite-connector protrusions 81 and 82 due to sink marks during molding can be prevented or suppressed.

Further, the resin injected into the mold 120 and flowing into the first connector opposite side recess 126 flows from the first extending recess portion 131 to the second connector opposite side recess 127 side, wherein the first extending recess portion 131 is used to form the first extending portion 83. Further, the resin smoothly flows into the second connector opposite side recess 127 through the second extending recess portion 132, wherein the second extending recess portion 132 is used to form the second extending portion 84. Further, the first extension portion 83 extends from an end of the first opposing portion on the opposite side to the side on which the connector-side protruding portion 80 is located, and the second extension portion 84 extends from an end of the second opposing portion on the opposite side to the side on which the connector-side protruding portion 80 is located. Thus, when the gate 123 is located between the connector side concave portion 125 for forming the connector side protruding portion 80 and the first connector opposite side concave portion 126 for forming the first connector opposite side protruding portion 81, the resin easily flows from the first connector opposite side concave portion 126 side to the second connector opposite side concave portion 127 side. Thus, the filling of the resin into the second connector opposite side concave portion 127 located at a position separated from the gate 123 can be performed reliably.

Further, since the connector-side protruding portion 80 is larger than the first connector-opposite-side protruding portion 81 and the second connector-opposite-side protruding portion 82, respectively, the connector-side concave portion 125 provided in the mold 120 for forming the connector-side protruding portion 80 is larger than the first connector-opposite-side concave portion 126 and the second connector-opposite-side concave portion 127. Accordingly, the resin injected into the mold 120 easily flows into the connector-side concave portion 125, and therefore deformation of the connector-side protruding portion 80 due to sink marks during molding can be prevented or suppressed.

In this example, the output opposite side L2 of the connection portion 45a of the resin sealing member 13 that connects the end of the wire 44V, the end of the wire 44U, and the end of the wire 44W is thickened by providing the first connector opposite side protruding portion 81. Thus, even in the case where the connection portion 45a moves at the time of molding of the resin sealing member 13, the connection portion 45a is prevented from being exposed to the outside from the resin sealing member 13.

(action Effect)

According to the present example, the resin seal member 13 covering the coil 32 includes a seal member bottom 65, and the seal member bottom 65 is located on the output opposite side L2 of the rotor 10 and the stator 11. The seal member bottom 65 includes a connector-side protruding portion 80, the connector-side protruding portion 80 protruding toward the output-opposite side L2 between the axis L and the connector 20, and a first connector-opposite side protruding portion 81 and a second connector-opposite side protruding portion 82 are provided at positions on the opposite side of the connector-side protruding portion 80 so as to sandwich the axis L. The distal end surface 80a of the connector-side protruding portion 80, the distal end surface 81a of the first connector-opposite-side protruding portion 81, and the distal end surface 82a of the second connector-opposite-side protruding portion 82 are located on the same virtual plane S on the opposite-output side L2 from the connector 20. Therefore, when the motor 2 is placed on a placement surface such as a table in a posture where the output opposite side L2 is located below, the motor 2 is self-standing in a posture where the distal end surfaces 80a, 81a, 82a of the three protruding portions 80, 81, 82 are in contact with the placement surface (a posture where the virtual surface S coincides with the placement surface). In the standing posture, the connector 20 is positioned closer to the output side L1 than the mounting surface (virtual surface S). Therefore, the connector 20 is not damaged by contact with the mounting surface. Further, since the connector-side protruding portion 80 is provided at a position closer to the connector 20 than the axis L, the connector 20 can be reliably prevented from coming into contact with the mounting surface.

Even in the pump device 1, when the pump device 1 is placed on a mounting surface of a table or the like in a posture in which the output side L2 of the motor 2 is located downward, the connector 20 of the motor 2 does not come into contact with the mounting surface. Thus, the connector 20 can be prevented from being broken by contact with the mounting surface.

In this example, the first connector-opposite-side protruding portion 81 and the second connector-opposite-side protruding portion 82 are made smaller than the connector-side protruding portion 80, respectively, so that the amount of resin material used for molding the resin sealing member 13 can be suppressed. On the other hand, even in the case where the first connector-opposite-side projecting portion 81 and the second connector-opposite-side projecting portion 82 are respectively reduced, the first connector-opposite-side recessed portion 126 and the second connector-opposite-side recessed portion 127 in the mold 120, which are used for forming the first connector-opposite-side projecting portion 81, include inclined surfaces 128, 129 for guiding the resin, and the second connector-opposite-side recessed portion 127 is used for forming the second connector-opposite-side projecting portion 82. Thus, the resin can smoothly flow into the first connector opposite side concave portion 126 and the second connector opposite side concave portion 127. This prevents or suppresses deformation of the first connector opposite side protruding portion 81 and the second connector opposite side protruding portion 82 due to sink marks during molding.

Further, in this example, the first connector opposite side protrusion 81 includes a first extension portion 83, and the second connector opposite side protrusion 82 includes a second extension portion 84, so that the resin injected into the mold 120 flows from the first extension concave portion 131 to the second connector opposite side concave portion 127 side. Here, the first extension 83 and the second extension 84 have a shape in which the protruding amount becomes smaller toward the tip end side, and thus the amount of resin material used to mold the resin sealing member 13 can be suppressed.

The gate 123 for injecting the resin into the mold 120 may be provided between the connector side concave portion 125 for forming the connector side protruding portion 80 and the second connector opposite side concave portion 127 for forming the second connector opposite side protruding portion 82. Even in this case, as in the above case, the resin can smoothly flow into the first connector opposite side concave portion 126 and the second connector opposite side concave portion 127. Thus, filling of the resin into the first connector opposite side concave portion 126 and the second connector opposite side concave portion 127 can be performed reliably.

Claims

1. An electric motor, comprising:

A rotor;

a stator including a plurality of coils arranged in a ring shape around a rotation center line of the rotor and surrounding the rotor;

a connector which is located on the outer peripheral side of the plurality of coils, and which allows an external cable for supplying electric power to the plurality of coils to be detachably connected from the opposite output side when one side in the rotation center line direction is set as an output side and the other side is set as the opposite output side; and

a resin sealing member covering the coil,

the resin sealing member includes: an output opposite side sealing portion located on the output opposite side of the rotor and the stator; and a connector sealing portion that covers the connector from the output side,

the output opposite side seal portion includes: a connector-side protruding portion that protrudes toward the opposite output side between the rotation center line and the connector; and a connector-opposite-side protruding portion protruding toward the output-opposite side on a side opposite to the connector-side protruding portion in such a manner as to sandwich the rotation center line,

The front end surface of the connector-side protruding portion and the front end surface of the connector-opposite-side protruding portion are located on an imaginary plane intersecting the rotation center line and located on the opposite-output side from the connector,

in the connector-opposite-side protruding portion, a first side surface and a second side surface are inclined surfaces inclined in directions approaching each other as approaching a front end surface of the connector-opposite-side protruding portion, the first side surface faces one side in a circumferential direction around the rotation center line, the second side surface faces the other side around the rotation center line,

as the connector-opposite-side protruding portion, a first connector-opposite-side protruding portion and a second connector-opposite-side protruding portion are included, the second connector-opposite-side protruding portion being provided at a position separated from the first connector-opposite-side protruding portion in the circumferential direction,

the front end face of the connector-side protruding portion is longer than the front end faces of the first connector-opposite-side protruding portion and the second connector-opposite-side protruding portion in the circumferential direction,

the area of the front end surface of the connector-side protruding portion is larger than the area of the front end surface of the first connector-opposite-side protruding portion and the area of the front end surface of the second connector-opposite-side protruding portion,

The first connector opposite side projection includes a first extension portion extending from a first opposite portion opposite to the second connector opposite side projection toward the second connector opposite side projection,

the second connector-opposite-side protruding portion includes a second extending portion extending from a second opposite portion opposite to the first connector-opposite-side protruding portion toward the first connector-opposite-side protruding portion side,

the first projecting amount of the first extending portion becomes smaller as approaching the second connector opposite side projecting portion,

the second projecting amount of the second extending portion becomes smaller as approaching the first connector opposite side projecting portion.

2. The motor of claim 1, wherein the motor is configured to control the motor to drive the motor,

the first extending portion extends from an end portion of the first opposing portion on a side opposite to a side on which the connector-side protruding portion is located,

the second extending portion extends from an end of the second opposing portion on a side opposite to a side on which the connector-side protruding portion is located.

3. An electric motor according to claim 1 or 2, characterized in that,

The stator includes a stator core around which a plurality of the coils are wound,

the plurality of coils comprises a U-phase coil, a V-phase coil and a W-phase coil,

the end of the U-phase wire, the end of the V-phase wire, and the end of the W-phase wire are connected to each other, wherein the U-phase wire forms the U-phase coil, the V-phase wire forms the V-phase coil, the W-phase wire forms the W-phase coil,

the connection portion where the end of the U-phase conductor, the end of the V-phase conductor, and the end of the W-phase conductor are connected to each other is located on the opposite output side of the stator core and overlaps with the first connector-opposite side protruding portion when viewed from the rotation center line direction.

4. A pump apparatus, comprising:

a motor as claimed in any one of claims 1 to 3;

a pump chamber; and

an impeller disposed in the pump chamber,

the rotor has an output shaft coaxial with the rotation center line, the output shaft extends from an outer side of the pump chamber into the pump chamber, and the impeller is connected to an end portion of the output shaft on the output side.