JP2012139027A - Axial gap motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial gap motor that can hold a stator comprising a plurality of core members and a circuit board against displacement under an injection pressure of molding resin.SOLUTION: The axial gap motor includes: a disk-shaped circuit board 70 disposed in axial opposition to a stator 60; an annular stator presser member 80 disposed between the stator 60 and the circuit board 70, and having a first abutting portion 81 abutting core members 64 on one axial surface side and having second abutting portions 82 abutting the circuit board 70 on the other surface side; and circuit board presser members 90 disposed in axial opposition to the second abutting portions 82 with the circuit board 70 in between to abut the circuit board 70. The stator 60 and the circuit board 70 are held together under axial pressure of a molding die on the stator presser member 80 and the circuit board presser member 90.

Description

  The present invention relates to an axial gap type electric motor, and more particularly to an axial gap type electric motor in which a stator and a circuit board are integrally formed with a mold resin.

  Conventionally, a radial gap type electric motor in which a stator and a circuit board are integrally formed with a mold resin is known (for example, see Patent Document 1). The stator in this radial gap type electric motor includes a pair of positioning columns for positioning the circuit board. The pair of positioning columns are erected from an insulator that covers the stator core. The circuit board includes a pair of notches at positions where the circuit board comes into contact with the pair of positioning columns. The circuit board is fitted between the pair of positioning columns and is positioned with respect to the stator by the pair of notches.

  In this radial gap type electric motor, a stator on which a circuit board is positioned is sandwiched between a lower mold and an upper mold and is integrally formed with a mold resin. The upper mold is provided with six pressing columns that protrude toward the circuit board. At the time of integral molding of the mold, two of the six pressing columns press the positioning column, and the remaining four press the circuit board.

  However, since the stator is pressed by the lower mold with only two holding columns, for example, when the stator is configured by connecting three or more core members in an annular shape, the lower pressure is reduced by the injection pressure of the mold resin. There is a possibility that the core member not held by the mold may be displaced. Further, since the circuit board is pressed by only four pressing columns and is not supported from the stator side, the circuit board may be bent and deformed to the stator side. Furthermore, this structure is a structure of a radial gap type motor in which the stator and the rotor are opposed in the radial direction, and there is a problem that the structure cannot be applied as it is to an axial gap type motor in which the stator and the rotor are opposed in the axial direction.

Japanese Patent Laid-Open No. 2005-102407

  In view of the above problems, the present invention can hold the stator and the circuit board, which are composed of a plurality of core members, so as not to be displaced due to the injection pressure of the mold resin when the stator and the circuit board are integrally formed with the mold resin. An object is to provide an axial gap type electric motor.

  In order to solve the above-mentioned problems, an axial gap type motor according to the present invention has an annular contact between a stator and a circuit board between a stator and a disk-shaped circuit board that are formed by connecting a plurality of core members together. And a circuit board pressing member that contacts the circuit board at a position facing the stator pressing member in the axial direction.

  According to the axial gap type electric motor of the present invention, the stator and the circuit board can be held by the stator pressing member and the circuit board pressing member and can be sandwiched between the lower mold and the upper mold. Can be held so as not to be displaced by the injection pressure of the mold resin.

It is an external appearance perspective view which shows the pump apparatus using the axial gap type electric motor by this invention. It is sectional drawing which shows the pump apparatus using the axial gap type electric motor by this invention. It is an external appearance perspective view which shows the state which looked at the stator of the axial gap type motor by this invention from the teeth part side. It is an external appearance perspective view which shows the state which looked at the stator of the axial gap type electric motor by this invention from the back yoke side. It is a figure which shows the stator pressing member used for the axial gap type electric motor by this invention, (A) is sectional drawing, (B) is an external appearance perspective view. It is a top view which shows the circuit board used for the axial gap type motor by this invention. It is a figure which shows the circuit board pressing member used for the axial gap type electric motor by this invention, (A) is sectional drawing, (B) is an external appearance perspective view. It is an external appearance perspective view which shows the state holding the stator and the circuit board. It is sectional drawing which shows the state in which the assembly holding a stator and a circuit board was accommodated in the metal mold | die. It is sectional drawing which shows the state which integrally molded the stator and the circuit board with mold resin.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the pump device using the axial gap type electric motor in this embodiment is partitioned into a pump chamber A and an electric motor chamber B by a resin partition plate 110 in a watertight manner.

  The pump chamber A is configured such that the shaft 10, the rotor 20, the impeller 30 and the bearing 40 are accommodated in a pump casing 50 in which a pump suction port 51 and a pump discharge port 52 are integrally formed. The rotor 20 and the impeller 30 are rotatably supported with respect to the shaft 10 via a carbon bearing 40. The electric motor chamber B is an electric motor housing 100 in which the stator 60, the circuit board 70, the stator pressing member 80, and the circuit board pressing member 90 are integrally formed with a mold resin 67.

  The rotor 20 is a disc whose center is rotatably supported by the shaft 10 via a bearing 40 and whose outer shell is covered with resin. A magnet 21 is embedded inside the surface of the disk on the motor chamber B side so as to face the partition plate 110. A plurality of magnets 21 are annularly arranged at equal angular pitches in the circumferential direction. The rotor 20 has an impeller 30 integrally formed on the surface on the pump casing 50 side. The impeller 30 may be a separate body from the rotor 20.

  The stator 60 has a plurality of core members 64. The core member 64 includes a teeth portion 613 that faces the rotor 20, a winding drum portion 611 that stands upright from the teeth portion 613, and a yoke piece 612 that forms a part of an annular back yoke on the tip side of the winding drum portion 611. A stator core 61, an insulator 62 covering the teeth 613 and the yoke piece 612 of the stator core 61, and a winding 63 wound around the winding body 611 via the insulator 62. The teeth portion 613 of the core member 64 is disposed so as to face the partition plate 110 and is in contact with the partition plate 110. Each core member 64 is provided with a connecting means, which will be described later, and is connected to each other by the connecting means, so that the core members 64 are annularly arranged at equal angular pitches in the circumferential direction.

  The circuit board 70 is a disk-shaped board on which an electric motor drive unit that performs drive control of the axial gap type electric motor is mounted. The circuit board 70 is disposed opposite to the yoke piece 612 of the core member 64 at a predetermined interval along the axial direction of the shaft 10, and is supported by a circuit board support portion 621 formed on the insulator 62.

  In the axial gap type motor itself, the teeth portion 613 of the stator 60 and the magnet 21 of the rotor 20 are arranged opposite to each other with a predetermined gap along the axial direction of the shaft 10 with the partition plate 110 interposed therebetween.

  The stator pressing member 80 is an annular member disposed between the core member 64 of the stator 60 and the circuit board 70. The stator pressing member 80 is made of a resin such as ABS or PPS having insulation properties and high temperature resistance. The stator pressing member 80 includes a first contact portion 81 that contacts the yoke piece 612 of the core member 64 on one side surface in the axial direction of the shaft 10, and a first contact portion that contacts the circuit board 70 on the other side surface. Two abutting portions 82 are provided.

  The circuit board pressing member 90 is a plurality of columnar members disposed so as to face the second contact portion 82 of the stator pressing member 80 along the axial direction with the circuit board 70 interposed therebetween. As with the stator pressing member 80, the circuit board pressing member 90 is formed of a resin such as ABS or PPS having insulation properties and high temperature resistance. The circuit board pressing member 90 has an abutting portion 92 that abuts the circuit board 70 on one side surface in the axial direction, and is pressed from the axial direction of the shaft 10 by a mold die 140 described later on the other side surface. A pressing portion 93 is provided.

  The stator 60, the stator pressing member 80, the circuit board 70, and the circuit board pressing member 90 described above are arranged in this order, and are held together by pressing the circuit board pressing member 90 with a mold die 140 described later. It has become so.

  The partition plate 110 includes a bottomed tubular cylindrical portion 111 having an opening, a shaft support portion 112 that integrally protrudes from the center of the bottom surface of the tubular portion 111 toward the outside in the axial direction, and the tubular portion 111. A flange 113 integrally formed in a disk shape from the opening in the radial direction and a peripheral portion 114 formed on the outer peripheral side of the flange 113 are provided. The flange portion 113 is located at a position where the teeth portion 613 of the stator 60 and the magnet 21 of the rotor 20 face each other, and is thinner than the thickness of the shaft support portion 112 and the surrounding portion 114 that require strength in order to improve magnetic efficiency. It has become. Further, the inside of the opening of the cylindrical portion 111 also serves as a bearing support portion, the bearing 40 is supported via the bearing support portion, and the shaft 10 is supported by the shaft support portion 112.

  The packing 120 is mounted in a recess in the peripheral portion 114. The pump casing 50 and the motor housing 100 are coupled and tightened by screws 130 outside the packing 120, so that the fluid in the pump chamber A does not leak out of the pump device.

  The operation of the pump device having the configuration described above will be described. In the pump device, the current supplied to the winding 63 is switched by the electric motor drive unit of the circuit board 70 according to the rotational position of the rotor 20. By switching the current, magnetic attraction / repulsion occurs between the tooth portion 613 of the stator 60 and the magnet 21 of the rotor 20, and the rotor 20 rotates in a predetermined direction together with the impeller 30. By the rotation of the rotor 20, fluid such as water or hot water is sucked from the pump suction port 51 as indicated by the black arrow, and the fluid is discharged from the pump discharge port 52 as indicated by the black arrow.

  Next, the core member 64 will be described in detail with reference to FIGS. In the present embodiment, the stator 60 is formed by twelve (12 slots) core members 64 connected to each other, and each core member 64 has substantially the same shape. The member 64 will be described.

  The stator core 61 provided in the core member 64 is formed by laminating electromagnetic steel sheets punched in an H shape along the radial direction of the stator 60 as shown in FIGS. 3 and 4. The stator core 61 may be formed by a method other than laminating, for example, a powder magnetic core obtained by forming a ferromagnetic material into a fine powder, covering the surface with an insulating coating, and compressing and solidifying, or cutting.

  The stator core 61 is integrally provided with a winding drum portion 611, a yoke piece 612, and a teeth portion 613. Thus, the stator core 61 is formed in a bobbin shape having the flange-shaped yoke portion 612 and the teeth portion 613 at both ends of the winding drum portion 611.

  The winding drum 611 is formed so that the width in the circumferential direction gradually increases from the inner diameter side toward the outer diameter side. When viewed from the axial direction, the yoke piece 612 and the tooth portion 613 are formed in a fan shape whose width in the circumferential direction gradually increases from the inner diameter side toward the outer diameter side. In addition, the shape of the winding drum part 611, the yoke part piece 612, and the teeth part 613 is not restricted to a present Example, The shape may be arbitrary according to the specification of an electric motor.

  The yoke piece 612 has a yoke surface 612 a and an inner peripheral surface 612 b that are in contact with the first contact portion 81 of the stator pressing member 80. In addition, contact surfaces that contact the yoke piece 612 of the adjacent core member 64 are formed at both ends of the yoke piece 612 in the radial direction. The teeth portion 613 is formed with a teeth surface 613a that contacts the flange portion 113 of the partition plate 110 and an inner peripheral surface 613b that contacts an inner peripheral side support portion 141a of the lower mold 141 described later.

  The insulator 62 covers the outer cylindrical portion 622 covering the outer peripheral surface of the winding drum portion 611 shown in FIG. 2, the inner peripheral side and the outer peripheral side of the yoke portion piece 612 and the tooth portion 613, and the yoke portion piece 612 and the tooth portion. 613 and a flange portion 623 extending in the radial direction from both sides. Accordingly, the insulator 62 is formed in a bobbin shape having the flange portions 623 at both ends of the outer cylindrical portion 622, as with the stator core 61.

  The insulator 62 is made of a resin molded product, and is substantially divided into half along the circumferential direction. The insulator 62 is fitted to the stator core 61 by being fitted from both sides of the stator core 61 in the circumferential direction. The insulator 62 may be integrally formed with the stator core 61.

  The flange portion 623 is provided with two connecting means for connecting the core members 64 to each other in the circumferential direction. As a first connecting means, a hook portion 623 a for connecting the core members 64 in an annular shape around the shaft 10 and a hook portion 623 a are engaged with the outer circumferential side end surface of the flange portion 623. A locking shaft 623b is formed.

  The hook portion 623a is formed of a tongue piece protruding from one end of the outer diameter side end surface toward the outer side in the circumferential direction. A hook groove that is hooked on the outer peripheral surface of the locking shaft 623b is formed on the tip side of the hook portion 623a. The locking shaft 623b is formed of a cylinder protruding in the axial direction from the other end of the outer diameter side end surface. The height of the locking shaft 623b is set lower than the tooth surface 613a so that the tooth surface 613a is the outermost surface of the core member 64 in the axial direction.

  As the second connecting means, a locking rib 623c and a locking groove 623d on the receiver side of the locking rib 623c are formed on the inner diameter side end surface of the flange portion 623 in the circumferential direction. The locking rib 623c is a convex piece that protrudes outward in the circumferential direction from one end of the end face on the inner diameter side. The locking groove 623d is a concave groove that is recessed in the axial direction from the other end of the inner diameter side end face. The convex piece of the locking rib 623c is inserted into the concave groove of the locking groove 623d.

  Among the flange portions 623, circuit board support portions 621 are respectively formed on the outer diameter side end portion and the inner diameter side end portion of the flange portion 623 on the yoke portion piece 612 side in the circumferential direction. The circuit board support part 621 has an outer diameter side support part 621a and an inner diameter side support part 621c. The outer diameter side support portion 621a that supports the outer diameter side of the circuit board 70 includes a support column that protrudes in the axial direction from the outer diameter side end portion. On the distal end side of the outer diameter side support portion 621a, a locking claw 621b that is locked to a locking portion 71 described later on the circuit board 70 is formed. The inner diameter side support portion 621c that supports the inner diameter side of the circuit board 70 includes a support column that protrudes in the axial direction from the inner diameter side end. The front end surface of the support of the inner diameter side support portion 621c is in contact with the inner diameter side surface of the circuit board 70 to support the circuit board 70.

  A terminal pin 623e is erected on the outer diameter side end of the flange 623 on the yoke piece 612 side in the circumferential direction. The terminal pin 623e is inserted into the distal end of a terminal block that protrudes in the axial direction from the outer diameter side end.

  When the core members 64 described above are connected to each other, as shown in FIG. 4, two core members 64 out of the twelve core members 64 include an outer diameter side support portion 621a, an inner diameter side support portion 621c, and Using a core member 64 having a terminal pin 623e, one core member 64 uses a core member 64 having an outer diameter side support portion 621a and an inner diameter side support portion 621c, and the four core members 64 are terminals. A core member 64 having a pin 623e is used. The remaining five core members 64 use the core members 64 that are not provided with the outer diameter side support portion 621a, the inner diameter side support portion 621c, and the terminal pin 623e.

  The stator 60 is configured such that three core members 64 having an outer diameter side support portion 621a and an inner diameter side support portion 621c are arranged at an equiangular pitch of 120 °. In the middle, four core members 64 having terminal pins 623e and five core members 64 not having terminal pins 623e are connected to each other. Thereby, the stator 60 has a structure in which twelve core members 64 are arranged in an annular shape.

  Next, the stator pressing member 80 will be described in detail with reference to FIG. As shown in FIG. 5, the stator pressing member 80 includes a ring portion 811 having an L-shaped cross section that abuts against the twelve core members 64 arranged in an annular shape, and a circuit board 70 side from one side of the ring portion 811. And a plurality of support columns 821 erected in the axial direction. Four struts 821 are provided and are erected at an equiangular pitch of 90 °. On the front end side surface of the support column 821, a convex portion 821a is formed standing on the circuit board 70 side in the axial direction.

  The first abutment portion 81 is formed by a ring portion 811, and a first abutment surface 811 a that abuts against the core member 64 in the axial direction and a second abutment that abuts against the core member 64 in the radial direction. And a contact surface 811b. The first contact surface 811a contacts the inner peripheral surface 612b of the yoke piece 612 that forms part of the back yoke. The second contact surface 811b contacts the yoke surface 612a of the yoke piece 612 that forms part of the back yoke.

  The second abutting portion 82 is formed by the tip surface of the column portion 821 excluding the convex portion 821 a, and this tip surface is in contact with one side surface of the circuit board 70. At this time, the projecting portion 821a erected on the support column portion 821 is inserted into a projecting portion insertion hole 72 (described later) of the circuit board 70.

  Next, the circuit board 70 will be described in detail with reference to FIG. As shown in FIG. 6, the circuit board 70 has a donut shape in which a hole is provided in the center of the disk, and the shaft support portion 112 provided in the partition plate 110 projects from the hole. The circuit board 70 has a locking portion 71 that is locked by locking claws 621b formed in the outer diameter side support portion 621a on the outer peripheral side, and a plurality of protruding portion insertion holes 72 that are inserted into the protruding portions 821a. It is formed between the inner diameter side and the outer diameter side. Further, the circuit board 70 is formed with a plurality of terminal pin insertion holes 73 inserted into the terminal pins 623e on the outer peripheral side.

  The three locking portions 71 are provided in the same number as the outer diameter side support portions 621a, and are notches formed at an equiangular pitch of 120 °. The four convex insertion holes 72 are provided in the same number as the support pillars 821 and penetrate at an equal angular pitch of 90 °. Six terminal pin insertion holes 73 are provided so as to correspond to the terminal pins 623e provided in the six core members 64 shown in FIG. 4, and are through holes at an equal angular pitch of 30 °.

  Next, the circuit board pressing member 90 will be described in detail with reference to FIG. As shown in FIG. 7, the circuit board pressing member 90 is composed of a plurality of pressing column portions 91, and a concave portion 92 a that fits into the protruding portion 821 a of the column portion 821 is formed on the proximal end side surface of the pressing column portion 91. Is formed. In addition, a pressing portion 93 that is recessed in a cylindrical shape that is pressed by an upper die 142 (described later) of the mold die 140 is formed on the distal end side of the pressing column portion 91. Four pressing column portions 91 are provided in the same number as the supporting column portions 821.

  The contact portion 92 is formed by a base end side surface excluding the concave portion 92 a, and the base end side surface is in contact with the side surface of the circuit board 70 opposite to the core member 64 side. At this time, the concave portion 92 a formed in the pressing column portion 91 is fitted into the convex portion 821 a erected on the column portion 821, and the circuit board 70 is sandwiched between the column portion 821 and the pressing column portion 91.

  Next, an electric motor housing is formed using an annular stator 60 in which twelve core members 64 are connected to each other, a stator pressing member 80, a circuit board 70, and a pressing column portion 91 as a circuit board pressing member 90. The procedure for manufacturing 100 will be described with reference to FIGS. In addition, as shown in FIG. 9, it is assumed that the winding 63 is wound around the winding drum 611 via the insulator 62 in the twelve core members 64 shown in FIG. 8. Further, since the stator 60 constitutes a three-phase axial gap type electric motor, a U-phase core member set in which four core members 64 are connected by windings 63 of U-phase, V-phase, and W-phase. The V-phase core member set and the W-phase core member set are configured.

  As shown in FIGS. 8 and 9, as a first step, the stator pressing member 80 is assembled to the stator 60. First, the stator 60 is placed on an assembly table (not shown) so that the yoke surface 612a of the core member 64 is on the upper surface side. Next, the first contact surface 811 a and the second contact surface 811 b provided in the first contact portion 811 formed by the ring portion 811 of the stator pressing member 80 are used as the inner periphery of the yoke piece 612 of the core member 64. It is made to contact | abut to the surface 612b and the yoke surface 612a. As a result, the stator pressing member 80 is held by the stator 60.

  As a second step, the circuit board 70 is assembled to the stator 60 on which the stator pressing member 80 is held. The protrusion insertion hole 72 formed in the circuit board 70 is aligned with the protrusion 821 a of the stator pressing member 80. In addition, the locking portion 71 formed on the circuit board 70 is aligned with the locking claw 621 b formed on the outer diameter side support portion 621 a of the core member 64. At the same time, the terminal pin insertion hole 72 formed in the circuit board 70 is aligned with the terminal pin 623 e of the core member 64.

  Next, by pressing the aligned circuit board 70 toward the stator 60, the locking portion 71 is locked by the locking claw 621b of the outer diameter side support portion 621a. At this time, the convex portion 821a is inserted into the convex portion insertion hole 72 and protruded from the circuit board 70, and the side surface of the circuit board 70 on the stator 60 side is formed on the front end side surface of the support portion 821. It will be in the state contact | abutted by the contact part 82. FIG. At the same time, the terminal pin 623 e is inserted into the terminal pin insertion hole 72 and protrudes from the circuit board 70. The side surface on the stator 60 side of the circuit board 70 is also in contact with the front end side surface of the inner diameter side support portion 621c of the core member 64.

  In the third step, the pressing column portion 91 as the circuit board pressing member 90 is placed on the circuit board 70. At this time, the concave portion 92 a of the pressing column portion 91 is fitted into the convex portion 821 a of the stator pressing member 80. As a result, the contact portion 92 formed on the proximal end side surface of the pressing column portion 91 is in contact with the side surface opposite to the stator 60 side of the circuit board 70, and the circuit board 70 is connected to the support column portion 821. It will be in the state of being sandwiched and held between the holding column portions 91. The holding post 91 is placed on the circuit board 70, and the circuit board 70 and the terminal pins 623e are electrically connected to complete the pre-molded stator assembly as shown in FIG.

  In the fourth step, the above-described stator assembly is attached to a dedicated mold 140 and integrally molded with the mold resin 67. The mold die 140 includes a lower die 141 and an upper die 142 as shown in FIG. The lower mold 141 includes an annular support portion 141a that supports the inner peripheral surface 613b of the core member 64, a convex portion 141b that forms a concave portion into which the cylindrical portion 111 provided in the partition plate 110 is inserted, and a pump device. And an attachment hole forming portion 141c for forming an attachment hole for attaching to the other device. Further, the upper mold 142 is formed with a columnar pressing portion 142 a that presses the pressing portion 93 of the pressing column portion 91.

  First, the inner peripheral surface 613b of the teeth portion 613 of the core member 64 is supported by the inner diameter side support portion 141a, whereby the stator assembly is accommodated in the lower mold 141. At this time, the tooth surface 613 a of the tooth portion 613 of the core member 64 is in contact with the bottom surface of the lower mold 141. Next, the upper mold 142 is clamped to the lower mold 141 in a state where the pressing part 142 a of the upper mold 142 is fitted in the depression of the pressing part 93. As a result, the stator 60 and the circuit board are held at the relative positions and are pressed by the upper mold 142 toward the lower mold 141.

  Furthermore, by injecting molten resin into the mold mold 140 that has been clamped from an injection port (not shown), the stator 60, the stator pressing member 80, the circuit board 70, and the pressing column portion 91 are molded as shown in FIG. The resin 67 is integrally formed. Thereby, the electric motor housing 100 in which the insulation of the circuit board 70 and the waterproofing and dew condensation countermeasures between the stator 60 and the circuit board 70 are taken is completed. When manufacturing the motor housing 100, the partition plate 110 may be installed in the lower mold 141 together with the stator assembly and integrally molded with the mold resin 67.

  According to the axial gap type electric motor of the present invention described above, the stator 60 and the circuit board are interposed between the stator 60 which is formed by connecting the twelve core members 64 and the circular circuit board 70. 70 is provided with an annular stator pressing member 80 that abuts each of the 70, and a columnar circuit board pressing member 90 that contacts the circuit board 70 at a position facing the stator pressing member 80 in the axial direction of the shaft 10. ing.

  Therefore, the stator 60 and the circuit board 70 can be held together by the stator pressing member 80 and the circuit board pressing member 90 and sandwiched between the lower mold 141 and the upper mold 142. However, it can hold | maintain so that position shift may not be carried out by the injection pressure of mold resin.

  Further, the stator pressing member 80 includes a ring portion 811 having an L-shaped cross section that abuts against the twelve core members 64 arranged in an annular shape, and is formed by the ring portion 811, and the yoke piece 612 of the core member 64. It has the structure which has the 1st contact part 81 which contact | abuts.

  Accordingly, since the first contact surface 811a and the second contact surface 811b of the first contact portion 81 can be in contact with the inner peripheral surface 612b and the yoke surface 612a of the yoke portion piece 612, the twelve stator cores 61 are provided. The whole is held by the lower mold 141 and can be held so that the relative positions of the twelve stator cores 61 are not shifted by the injection pressure of the mold resin. For this reason, it is possible to prevent the magnetic efficiency from being lowered due to the displacement of the relative positions of the twelve stator cores 61.

  Further, the stator pressing member 80 can be positioned in the axial direction and the radial direction with respect to the annular stator 60, and the stator pressing member 80 is positioned in the radial direction of the stator 60, so that the twelve stator cores 61 can be positioned. The roundness of the core can be secured.

  In addition, according to the axial gap type electric motor of the present invention described above, the stator pressing member 80 includes the four support portions 821 erected in the axial direction from one side surface of the ring portion 811 to the circuit board 70 side. Provided with a convex portion 821a erected in the axial direction from the side surface of the support column 821, and a second contact portion 82 that contacts the circuit board 70 is formed by the side surface of the support column 821. ing. On the other hand, the circuit board pressing member 90 includes four pressing column portions 91, and has a structure including a concave portion 92a fitted to the convex portion 821a on the proximal end side surface of the pressing column portion 91. The circuit board 70 has a structure including a convex portion insertion hole 72 to be inserted into the convex portion 821.

  Therefore, the circuit board 70 is supported from the stator 60 side by the second abutting portion 82 in a state where the convex portion 821a of the supporting portion 821 is inserted into the convex portion insertion hole 72. It is possible to prevent the substrate 70 from being bent and deformed toward the stator 60 side. In addition, since the circuit board 70 is sandwiched between the support column part 821 and the pressing column part 91 in a state in which the recess part 92a is fitted to the convex part 821a, the supporting force of the circuit board 70 can be enhanced and the pressing column can be provided. The portion 91 can be positioned with respect to the stator pressing member 80.

  Furthermore, according to the axial gap type electric motor of the present invention described above, the pressing portion 93 is provided on the distal end side of the pressing column portion 91, and the pressing portion 93 is pressed by the pressing portion 142a of the upper mold 142. 70 and the stator 60 are indirectly pressed.

  Therefore, as in Patent Document 1, since the circuit board is not directly pressed by the plurality of pressing columns provided in the upper mold, the stator 60 and the circuit board 70 are integrally formed with the mold resin, and then the motor housing 100 is mounted. Although a hole is formed by the pressing portion 142a of the upper mold 142, a hole reaching the circuit board 70 is not formed. For this reason, since the circuit board 70 is not exposed to the outside, it is possible to ensure the insulation and waterproofing effects of the circuit board 70.

  In the present embodiment, the stator pressing member 80 includes a first contact surface that includes a first contact surface 811a that contacts the core member 64 in the axial direction and a second contact surface 811b that contacts the core member 64 in the radial direction. The contact portion 81 is formed by the ring portion 811 having an L-shaped cross section. However, the present invention is not limited to this, and the core member is not limited to the ring member 811 having the L-shaped cross section. Any structure may be used as long as the first abutting portion having two abutting surfaces that abut against the axial direction and the radial direction with respect to 64 is formed.

  Further, in the present embodiment, the stator pressing member 80 is provided with a convex portion 821a erected from the distal end surface of the support column portion 821, and the convex portion 821a is provided on the proximal end side surface of the pressing column portion 91 as the circuit board pressing member 90. However, the present invention is not limited to this, and the stator pressing member 80 includes a concave portion that is recessed from the front end surface of the column portion 821. The structure which provided the convex part standingly arranged from the base end side surface of the pillar part 91, and fitted the convex part of the press pillar part 91 in the recessed part of the support | pillar part 821 may be sufficient.

  Further, in the present embodiment, the stator pressing member 80 has a structure including the ring portion 811 and the support column portion 821. However, the present invention is not limited to this, and for example, the stator pressing member 80 is formed from the ring portion. A structure in which the thickness of the ring portion is formed so as to maintain a predetermined distance between the stator 60 and the circuit board 70 without providing the column portion upright may be used. In addition, the circuit board pressing member 90 has a structure including a plurality of pressing column portions 91. However, the present invention is not limited to this, and for example, the circuit board pressing member 90 includes one piece such as the stator pressing member 80. An annular member may be used.

  Thereby, similarly to the above-described embodiment, the stator 60 and the circuit board 70 can be held so as not to be displaced due to the injection pressure of the mold resin, and all the 12 core members 64 are made of the mold resin. It can hold | maintain so that it may not mutually position-shift by injection | pouring pressure.

A pump chamber B electric motor chamber 10 shaft 20 rotor 21 magnet 30 impeller 40 bearing 50 pump casing 51 pump suction port 52 pump discharge port 60 stator 61 stator core 611 winding drum portion 612 yoke portion piece 612a yoke surface 612b inner peripheral surface 613 teeth portion 613 Teeth surface 613b Inner peripheral surface 62 Insulator 621 Circuit board support part 621a Outer diameter side support part 621b Locking claw 621c Inner diameter side support part 622 Outer cylinder part 623 Flange part 623a Hook part 623b Locking shaft 623c Locking rib 623d Locking groove 623e Terminal pin 63 Winding 64 Core member 67 Mold resin 70 Circuit board 71 Locking portion 72 Convex portion insertion hole 73 Terminal pin insertion hole 80 Stator pressing member 81 First contact portion 811 Ring portion 811a First contact Surface 811b Second contact surface 82 Second contact portion 821 Post portion 821a Protrusion portion 90 Circuit board pressing member 91 Pressing column portion 92 Contact portion 92a Concavity 93 Pressing portion 100 Motor housing 110 Partition plate 111 Cylindrical portion (bearing support) Part)
112 Shaft support portion 113 Hook portion 114 Peripheral portion 120 Packing 130 Screw 140 Mold die 141 Lower die 141a Support portion 141b Protruding portion 141c Mounting hole forming portion 142 Upper die 142a Holding portion

Claims (3)

The stator and the rotor are arranged to face each other with a predetermined gap along the axial direction of the rotor, the stator has a plurality of core members arranged in an annular shape around the axis, and the core member is a core member Axial gap type electric motors connected to each other by connecting means for connecting each other,
A disc-shaped circuit board disposed opposite to the stator at a predetermined interval along the axial direction;
An annular member disposed between the stator and the circuit board, having a first contact portion that contacts the core member on one side of the axial direction, and the circuit board on the other side A stator pressing member having a second abutting portion that abuts with
A circuit board pressing member that is disposed opposite to the second contact portion along the axial direction across the circuit board, and that presses the circuit board by pressing with a mold;
The stator, the circuit board, the stator pressing member, and the circuit board pressing member are integrally formed of a molding resin.   The first contact portion of the stator pressing member includes a first contact surface that contacts the core member in the axial direction, and a second contact surface that contacts the core member in the radial direction. The axial gap type electric motor according to claim 1, further comprising: The second contact portion of the stator pressing member and the circuit board pressing member are each provided with a concave portion or a convex portion for fitting with each other,
The axial gap type electric motor according to claim 1, wherein the circuit board includes an insertion hole into which the convex portion is inserted.

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