JP2020102953A - Motor and pump unit - Google Patents

Abstract

To provide a motor, having a bulkhead member with a bulkhead disposed between a rotor and a stator and a circuit board for controlling a motor, capable of suppressing vibration caused by the rotation of the rotor from being transmitted to the circuit board.SOLUTION: In a motor 1, a circuit board 6 is disposed on Z1 direction side of a bottom part 11c of a bulkhead 11a supporting an end part of a rotor 4 in the Z1 direction. The face of the circuit board 6 on Z2 direction side is brought into contact with an end face on the Z1 direction side of a plurality of substrate support parts projecting to the Z1 direction side from a flange part 11d of a bulkhead member 11. At an end face on the Z1 direction side of the substrate support part, there is provided a projection 11r for positioning the circuit board 6 in the direction orthogonal to the axial direction of the rotor 4 and fixing the circuit board 6. In the motor 1, a clearance is formed between the circuit board 6 and the bottom part 11c in the axial direction of the rotor 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a motor having a partition wall arranged between a rotor and a stator. The present invention also relates to a pump device including such a motor.

BACKGROUND ART Conventionally, a motor for a pump device that rotates an impeller in a pump chamber of the pump device is known (see, for example, Patent Document 1). The motor described in Patent Document 1 includes a rotor having a driving magnet, a stator having a driving coil, a circuit board for controlling the motor, and a partition wall member having a partition wall arranged between the rotor and the stator. It has and. The stator is arranged on the outer peripheral side of the rotor via a partition wall. That is, the motor described in Patent Document 1 is an inner rotor type motor.

In the motor described in Patent Document 1, the rotor has a rotating shaft to which a driving magnet is fixed. The rotor is arranged so that the axial direction of the rotor and the vertical direction match (that is, the axial direction of the rotating shaft and the vertical direction match). The partition wall includes a cylindrical portion that is arranged between the rotor and the stator in the radial direction of the rotor, and a bottom portion that closes the upper end of the cylindrical portion. A bearing that supports the upper end side of the rotary shaft is fixed to the lower surface side of the bottom portion. The partition member includes a cylindrical outer cylinder portion arranged on the outer peripheral side of the partition wall, and a bottom surface portion connecting the lower end of the cylindrical portion and the lower end of the outer cylinder portion. The stator is arranged between the cylindrical portion and the outer cylinder portion and above the bottom surface portion.

In the motor described in Patent Document 1, the circuit board is arranged above the stator. The circuit board is arranged above the bottom of the partition. Two positioning protrusions for positioning and fixing the circuit board fixed to the partition member in the direction orthogonal to the vertical direction are formed on the upper surface of the bottom portion. A cylindrical protrusion that rises upward is formed on the bottom surface of the partition member, and the tip of the protrusion serves as a positioning portion for positioning and fixing the circuit board together with the positioning protrusion. .. The circuit board is formed with a tip portion (positioning portion) of the protrusion and an insertion hole through which the positioning protrusion is inserted. The lower surface of the circuit board is in contact with the contact surface formed on the tip side of the protrusion and the contact surface formed on the positioning protrusion.

JP, 2017-229210, A

In the motor described in Patent Document 1, a positioning protrusion is formed on the upper surface of the bottom of the partition wall to which a bearing that supports the upper end side of the rotating shaft is fixed, and the contact surface of the positioning protrusion of the circuit board is formed on the contact surface. The bottom surface is in contact. Therefore, in the motor described in Patent Document 1, the vibration caused by the rotation of the rotor is easily transmitted to the circuit board. That is, in the motor described in Patent Document 1, the vibration generated in the rotor during rotation is transmitted to the circuit board via the bottom of the partition wall and the positioning protrusion, and the vibration generated in the rotor during rotation is transmitted to the circuit board. Since the transmission path until the transmission is short, the vibration caused by the rotation of the rotor is easily transmitted directly to the circuit board. Even if the vibration caused by the rotation of the rotor is transmitted to the circuit board, the circuit board does not immediately become defective, but if the vibration caused by the rotation of the rotor is intermittently transmitted to the circuit board for many years. , The circuit board may be defective.

Then, the subject of this invention is a motor provided with the partition member which has a partition wall arrange|positioned between a rotor and a stator, and the circuit board for controlling a motor WHEREIN: The vibration resulting from rotation of a rotor is a circuit board. It is to provide a motor capable of suppressing transmission. Moreover, the subject of this invention is providing the pump apparatus provided with such a motor.

In order to solve the above-mentioned problems, a motor of the present invention is a motor including a rotor and a stator, and a partition wall member having a partition wall disposed between the rotor and the stator, and a flat rigid board for controlling the motor. The thickness direction of the circuit board and the axial direction of the rotor are the same, one of the axial directions of the rotor is the first direction, and the opposite direction of the first direction is the second direction. Then, the partition wall has a cylindrical cylindrical portion arranged between the rotor and the stator in the radial direction of the rotor, and a bottom portion that closes the first-direction end of the cylindrical portion and supports the first-direction end of the rotor. The circuit board is disposed on the first direction side of the bottom portion, and the partition member is a flange portion that spreads in a flange shape from the second direction end of the cylindrical portion to the outside in the radial direction of the rotor, and the flange portion in the first direction. A plurality of board supporting portions projecting to the side, and the surface of the circuit board on the second direction side is in contact with the end surface of the plurality of board supporting portions on the first direction side, and the end surface of the board supporting portion on the first direction side. Has a projection for positioning the circuit board and fixing the circuit board in a direction orthogonal to the axial direction of the rotor, and the circuit board has a plurality of insertion holes through which the projections are inserted. In the axial direction, a gap is formed between the surface of the circuit board on the second direction side and the surface of the bottom portion on the first direction side.

In the motor of the present invention, a gap is formed between the bottom of the partition wall that supports the end of the rotor in the first direction and the surface of the circuit board on the second direction side in the axial direction of the rotor. Further, according to the present invention, the circuit board is provided on the end faces on the first direction side of the plurality of substrate supporting portions projecting in the first direction from the flange portion spreading outward in the radial direction of the rotor from the second direction end of the cylindrical portion of the partition wall. The surfaces on the second direction side are in contact with each other, and the circuit board is positioned and fixed in the direction orthogonal to the axial direction of the rotor by the protrusion formed on the end surface on the first direction side of the board supporting portion.

Therefore, in the present invention, the vibration generated in the rotor during rotation is not transmitted to the circuit board unless it passes through the board supporting portion. Therefore, in the present invention, it is possible to lengthen the transmission path until the vibration generated in the rotor during rotation is transmitted to the circuit board. As a result, according to the present invention, it is possible to suppress the transmission of the vibration caused by the rotation of the rotor to the circuit board.

In the present invention, for example, the rotor includes a rotating shaft and a drive magnet fixed to the rotating shaft, and a bearing that supports an end of the rotating shaft on the first direction side is fixed to the bottom. Further, in the present invention, for example, a welded portion is formed at the tip of the protrusion to prevent the circuit board from shifting in the first direction by coming into contact with the surface of the circuit board on the first direction side. ..

In the present invention, the stator includes a plurality of drive coils arranged at regular intervals in the circumferential direction of the rotor, and the substrate support portion is a flat plate connected to the outer peripheral surface of the cylindrical portion and the surface of the flange portion on the first direction side. It is preferable that each of the plurality of driving coils is formed in a circular shape and is arranged between the plurality of drive coils in the circumferential direction of the rotor. According to this structure, it is possible to increase the strength of the partition member by utilizing the substrate supporting portion connected to the outer peripheral surface of the cylindrical portion and the surface of the flange portion on the first direction side. Further, according to this structure, it is possible to prevent the drive coils adjacent to each other in the circumferential direction of the rotor from coming into contact with each other by utilizing the substrate supporting portion.

In the present invention, it is preferable that the end surface on the first direction side of the half or more of the board supporting portion in the radial direction of the rotor is a contact surface with which the surface on the second direction side of the circuit board contacts. According to this structure, it is possible to increase the area of the contact surface with which the surface of the circuit board on the second direction side comes into contact, so that the state of the circuit board fixed to the partition member can be stabilized. ..

In the present invention, for example, the circuit board is mounted with a board-side connector made of either a male connector or a female connector, and the board-side connector is made of the other one of a male connector and a female connector. The insertion/removal side connector can be inserted/removed, and the insertion/removal direction of the insertion/removal side connector with respect to the board side connector is orthogonal to the axial direction of the rotor. If the direction orthogonal to the axial direction of the rotor is the orthogonal direction. When viewed from the insertion/removal direction, at least two protrusions are arranged in the installation range of the board-side connector in the orthogonal direction. In this case, even if the load when inserting/removing the insertion/removal side connector to/from the board side connector acts on the protrusion, it is possible to suppress damage to the protrusion.

In the present invention, for example, at least two protrusions arranged at positions displaced from each other in the inserting/removing direction overlap each other in the installation range of the board-side connector in the orthogonal direction when viewed from the inserting/removing direction.

INDUSTRIAL APPLICABILITY The motor of the present invention is a pump device including an impeller attached to a rotor, and is used for a pump device in which a partition member defines the impeller and a part of a pump chamber through which a fluid passes. You can In this pump device, it is possible to suppress the vibration caused by the rotation of the rotor from being transmitted to the circuit board.

As described above, in the present invention, in the motor including the partition wall member having the partition wall disposed between the rotor and the stator, and the circuit board for controlling the motor, the vibration caused by the rotation of the rotor causes the circuit board to vibrate. It is possible to suppress the transmission to the. Further, in the pump device of the present invention, it becomes possible to suppress the vibration caused by the rotation of the rotor from being transmitted to the circuit board.

It is a sectional view of a pump device concerning an embodiment of the invention. It is a top view of a stator, a circuit board, and a partition member shown in FIG. It is a top view of a stator and a partition member shown in FIG. It is a perspective view of the partition member shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Overall structure of pump device)
FIG. 1 is a sectional view of a pump device 1 according to an embodiment of the present invention. FIG. 2 is a plan view of the stator 5, the circuit board 6 and the partition member 11 shown in FIG. FIG. 3 is a plan view of the stator 5 and the partition member 11 shown in FIG. In the following description, the Z1 direction in FIG. 1 and the like is the “up” direction, and the Z2 direction in FIG. 1 and the like, which is the opposite direction of the up direction, is the “down” direction.

The pump device 1 of this embodiment is a type of pump called a canned pump (canned motor pump), and is used in, for example, a dishwasher, a washing machine, or the like. The pump device 1 includes an impeller 2 and a motor 3 that rotates the impeller 2. The motor 3 is a DC brushless motor. The motor 3 includes a rotor 4, a stator 5, and a circuit board 6 for controlling the motor 3. The impeller 2, the rotor 4, the stator 5 and the circuit board 6 are arranged inside a case body formed by a housing 8 forming a part of the motor 3 and a case 9 covering a lower portion of the housing 8. The housing 8 and the case 9 are fixed to each other.

The case 9 is formed with a fluid suction portion 9a and a fluid discharge portion 9b. Inside the case 9, there is formed a pump chamber 10 through which the fluid sucked from the suction portion 9a passes toward the discharge portion 9b. The housing 8 includes a partition wall member 11 having a partition wall 11 a arranged between the rotor 4 and the stator 5 so as to separate the rotor 4 and the stator 5, and a cover 12 that covers the stator 5.

The rotor 4 includes a rotating shaft 14 and a driving magnet 15 fixed to the rotating shaft 14. The rotary shaft 14 is arranged so that the axial direction of the rotary shaft 14 and the vertical direction coincide with each other. That is, the vertical direction is the axial direction of the rotor 4. The drive magnet 15 is formed in a cylindrical shape. The drive magnet 15 is fixed to the outer peripheral surface of the rotating shaft 14 via a magnet holding member 16. On the outer peripheral surface of the drive magnet 15, N poles and S poles are alternately magnetized in the circumferential direction of the drive magnet 15. The upward direction (Z1 direction) of this embodiment is the first direction which is one of the axial directions of the rotor 4, and the downward direction (Z2 direction) is the second direction which is the opposite direction of the first direction. There is.

The impeller 2 is fixed to the lower end of the rotating shaft 14. That is, the impeller 2 is attached to the rotor 4. The impeller 2 is arranged inside the pump chamber 10. The rotating shaft 14 is rotatably supported by bearings 17 and 18. That is, the motor 3 includes bearings (radial bearings) 17 and 18 that rotatably support the rotating shaft 14. The bearings 17 and 18 are plain bearings. The bearings 17 and 18 are formed in a cylindrical shape with a collar having a collar portion on one end side. The rotary shaft 14 is inserted through the inner peripheral sides of the bearings 17, 18.

The bearing 17 is fixed to the upper end side of the partition wall 11a. The bearing 17 supports the upper end of the rotary shaft 14. The bearing 18 is held by a bearing holding member 19 fixed to the lower end side of the partition wall 11a. The drive magnet 15 is arranged between the bearing 17 and the bearing 18 in the vertical direction. The bearing holding member 19 holds a seal member 20 that prevents the fluid from flowing into the location where the drive magnet 15 is arranged. The seal member 20 is a rubber packing formed in a substantially cylindrical shape. The seal member 20 is arranged below the bearing 18.

The flange portion of the bearing 17 extends from the lower end portion of the bearing 17 to the outside in the radial direction of the rotor 4. The flange portion of the bearing 18 extends outward from the upper end portion of the bearing 18 in the radial direction of the rotor 4. A bearing plate 21 facing the flange portion of the bearing 17 is fixed to the upper end side of the magnet holding member 16. On the lower end side of the magnet holding member 16, a bearing plate 22 facing the flange portion of the bearing 18 is fixed. In this embodiment, the flange portions of the bearings 17 and 18 and the bearing plates 21 and 22 form a thrust bearing of the rotor 4.

The stator 5 includes a drive coil 23, a stator core 24, and an insulator 25, and is formed in a tubular shape as a whole. The stator 5 is arranged on the outer peripheral side of the rotor 4 via the partition wall 11a. That is, the motor 3 of this embodiment is an inner rotor type motor. Further, the stator 5 is arranged so that the axial direction of the stator 5 formed in a tubular shape and the vertical direction coincide with each other. In the following description, the radial direction of the rotor 4 and the stator 5 will be referred to as the “radial direction”, and the circumferential direction (circumferential direction) of the rotor 4 and the stator 5 will be referred to as the “circumferential direction”.

The stator core 24 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. The stator core 24 includes an outer peripheral ring portion 24a formed in an annular shape and a plurality of salient pole portions 24b protruding inward in the radial direction from the outer peripheral ring portion 24a. The stator core 24 of this embodiment includes three salient pole portions 24b. The three salient pole portions 24b are formed with an equal angular pitch and are arranged at regular intervals in the circumferential direction.

The insulator 25 is attached to each salient pole portion 24b. That is, the stator 5 includes three insulators 25. The insulator 25 is formed in a tubular shape with a flange having flanges at both ends. Specifically, the insulator 25 includes an inner collar portion 25a that constitutes an inner portion of the insulator 25 in the radial direction, an outer collar portion 25b that constitutes an outer portion of the insulator 25 in the radial direction, an inner collar portion 25a and an outer collar. It is composed of a tubular portion that connects the portion 25b.

The drive coil 23 is wound around the salient pole portion 24b via the insulator 25. That is, the stator 5 includes a plurality of drive coils 23 wound around each of the plurality of salient pole portions 24b. Specifically, the stator 5 includes three drive coils 23. The three drive coils 23 are arranged at an equal angular pitch. That is, the three drive coils 23 are arranged at regular intervals in the circumferential direction.

The stator 5 also includes a terminal pin 27 to which an end of the drive coil 23 is electrically connected. The lower end portion of the terminal pin 27 is fixed to the upper end portion of the inner flange portion 25a. The upper end portion of the terminal pin 27 projects upward from the upper end surface of the inner flange portion 25a. The drive coil 23 is wound around and soldered to the upper end of the terminal pin 27. The upper ends of the terminal pins 27 are soldered and fixed to the circuit board 6.

The partition member 11 is made of resin. As described above, the partition member 11 includes the partition 11a. The partition wall 11a is formed in a substantially bottomed cylindrical shape, and includes a cylindrical portion 11b and a bottom portion 11c. The cylindrical portion 11b is formed in a cylindrical shape. The cylindrical portion 11b is arranged so as to cover the outer peripheral surface of the driving magnet 15. That is, the drive magnet 15 is arranged on the inner peripheral side of the cylindrical portion 11b, and the cylindrical portion 11b is arranged between the rotor 4 and the stator 5 in the radial direction.

The axial center of the cylindrical portion 11b and the axial center (rotation center) of the rotor 4 coincide with each other. A constant gap is formed between the outer peripheral surface of the drive magnet 15 and the inner peripheral surface of the cylindrical portion 11b. The bottom portion 11c closes the upper end of the cylindrical portion 11b. The bearing 17 is fixed to the lower surface side of the bottom portion 11c. The bearing holding member 19 is fixed to the lower end side of the inner peripheral surface of the cylindrical portion 11b. The drive magnet 15 is arranged below the bottom portion 11c.

Further, the partition wall member 11 includes a flange portion 11d that spreads in a flange shape from the lower end of the cylindrical portion 11b to the outside in the radial direction. The stator 5 is arranged on the upper side of the flange portion 11d. The lower side of the collar portion 11d is the pump chamber 10, and a part of the pump chamber 10 is defined by the collar portion 11d. That is, a part of the pump chamber 10 is defined by the partition member 11. The collar portion 11 d has a function of preventing the fluid in the pump chamber 10 from flowing into the location where the stator 5 and the circuit board 6 are arranged. The specific configuration of the partition member 11 will be described later.

The circuit board 6 is a rigid board such as a glass epoxy board, and is formed in a flat plate shape. The circuit board 6 is arranged so that the thickness direction of the circuit board 6 and the up-down direction match. That is, the thickness direction of the circuit board 6 and the axial direction of the rotor 4 coincide. The circuit board 6 is arranged above the drive coil 23, the stator core 24, and the insulator 25. The circuit board 6 is arranged above the partition member 11. The circuit board 6 is arranged above the bottom 11c. The circuit board 6 is fixed to the partition member 11.

The circuit board 6 is formed with a plurality of insertion holes 6a through which projections 11r, which will be described later, formed on the partition wall member 11 are inserted (see FIG. 2). Specifically, the circuit board 6 is formed with three insertion holes 6a. On the circuit board 6, a board-side connector 30 composed of a male connector is mounted. An insertion/removal side connector 31, which is a female connector, can be inserted into and removed from the board-side connector 30. The board-side connector 30 may be a female connector. That is, the insertion/removal side connector 31 may be a male connector.

The insertion/removal direction (X direction in FIG. 2) of the insertion/removal side connector 31 with respect to the board side connector 30 is orthogonal to the vertical direction. In the following description, the insertion/removal direction of the insertion/removal side connector 31 with respect to the board side connector 30 is referred to as the “front/rear direction”, and the direction orthogonal to the up/down direction and the front/rear direction (Y direction in FIG. 2) is referred to as the “left/right direction”. The left-right direction (Y direction) of the present embodiment is an orthogonal direction orthogonal to the axial direction of the rotor 4 and the inserting/removing direction.

The cover 12 is formed in a substantially bottomed cylindrical shape as a whole. The cover 12 covers the outer peripheral side and the upper side of the stator 5 arranged on the upper side of the flange portion 11d. Further, the cover 12 covers the circuit board 6 from the outer side in the radial direction and the upper side. The cover 12 of this embodiment is configured by combining two cover members that are divided in a direction orthogonal to the vertical direction.

The cover 12 is attached to the partition member 11. Specifically, as shown in FIG. 1, the cover 12 is attached to the partition wall member 11 by engaging the radially outer portion of the lower end of the cover 12 with the radially outer portion of the collar portion 11d. .. The stator 5 and the circuit board 6 are arranged in a space defined by the partition wall 11a, the collar portion 11d and the cover 12. The cover 12 is formed with an opening for inserting/removing the insertion/removal side connector 31 into/from the board side connector 30.

(Structure of partition member)
FIG. 4 is a perspective view of the partition member 11 shown in FIG.

As described above, the partition wall member 11 includes the partition wall 11a including the cylindrical portion 11b and the bottom portion 11c, and the flange portion 11d that extends radially outward from the lower end of the cylindrical portion 11b. Further, the partition member 11 includes a plurality of reinforcing portions 11e arranged between the plurality of drive coils 23 in the circumferential direction, and a plurality of protruding portions 11f protruding upward from the flange portion 11d. The partition member 11 of this embodiment includes three reinforcing portions 11e and six projecting portions 11f.

A central portion of the bottom portion 11c in the radial direction is a bottomed cylindrical tubular portion 11g that projects upward. The bottom portion of the cylindrical portion 11g formed in a bottomed cylindrical shape constitutes the upper end portion of the cylindrical portion 11g. A bearing 17 is fixed to the inner peripheral side of the tubular portion 11g, and the tubular portion 11g supports the upper end portion of the rotary shaft 14 via the bearing 17. That is, the bearing 17 that supports the upper end of the rotary shaft 14 is fixed to the bottom 11 c, and the bottom 11 c supports the upper end of the rotor 4.

The flange portion 11d is a ring-shaped and flat plate-shaped first flange portion 11h that spreads radially outward from the lower end of the cylindrical portion 11b, and a flat, substantially cylindrical shape that rises upward from the outer peripheral end of the first flange portion 11h. It is composed of a tubular portion 11j (see FIG. 1) and a second flange portion 11k having a substantially annular and flat plate shape that extends radially outward from the upper end of the tubular portion 11j. The center of the first flange portion 11h and the center of the tubular portion 11j when viewed from the vertical direction coincide with the rotation center of the rotor 4. Further, the center of the inner peripheral surface of the second flange portion 11k when viewed from the vertical direction coincides with the rotation center of the rotor 4. The upper surface of the first collar portion 11h and the upper surface of the second collar portion 11k are planes orthogonal to the vertical direction.

The projecting portion 11f projects upward from a radially inner portion of the upper surface of the second flange portion 11k. The six projecting portions 11f are arranged at a constant pitch in the circumferential direction, and are arranged at an equal angle pitch with respect to the rotation center of the rotor 4. The upper surface of the protruding portion 11f is a flat surface orthogonal to the vertical direction. The lower surface of the outer peripheral ring portion 24a of the stator core 24 is in contact with the upper surface of the protruding portion 11f.

The reinforcing portion 11e is formed in a flat plate shape. Further, the reinforcing portion 11e radially spreads from the outer peripheral surface of the cylindrical portion 11b with respect to the rotation center of the rotor 4 and protrudes upward from the flange portion 11d. That is, the reinforcing portion 11e is formed in a rib shape connected to the outer peripheral surface of the cylindrical portion 11b and the upper surface of the collar portion 11d. Specifically, the entire inner end in the radial direction of the reinforcing portion 11e is connected to the outer peripheral surface of the cylindrical portion 11b, and the entire lower end of the reinforcing portion 11e is connected to the upper surface of the first flange portion 11h of the flange portion 11d. The strength of the partition member 11 is secured by the reinforcing portion 11e. The three reinforcing portions 11e are arranged at regular intervals in the circumferential direction. The reinforcing portion 11e has a function of preventing contact between the driving coils 23 adjacent to each other in the circumferential direction.

The reinforcement portion 11e is composed of an inner reinforcement portion 11p that constitutes an inner portion of the reinforcement portion 11e in the radial direction and an outer reinforcement portion 11q that constitutes an outer portion of the reinforcement portion 11e in the radial direction. The upper end surface of the inner reinforcing portion 11p and the upper end surface of the outer reinforcing portion 11q are planes orthogonal to the vertical direction. The height of the inner reinforcing portion 11p is higher than the height of the outer reinforcing portion 11q. That is, the upper end surface of the inner reinforcing portion 11p is arranged above the upper end surface of the outer reinforcing portion 11q. Further, the upper end surface of the inner reinforcing portion 11p is arranged above the upper surface of the bottom portion 11c. That is, the upper end surface of the inner reinforcing portion 11p is arranged above the upper end surface of the tubular portion 11g. The width of the inner reinforcing portion 11p in the radial direction is wider than the width of the outer reinforcing portion 11q in the radial direction.

The lower surface of the circuit board 6 is in contact with the upper end surfaces of the three reinforcing portions 11e. Specifically, the lower surface of the circuit board 6 is in contact with the upper end surfaces of the three inner reinforcing portions 11p. That is, the upper end surface of the inner reinforcing portion 11p, which is the upper end surface of the half or more of the reinforcing portion 11e in the radial direction, is the contact surface 11n with which the lower surface of the circuit board 6 contacts. The contact surface 11n supports the circuit board 6 from the lower side, and has a function of positioning the circuit board 6 in the vertical direction. The reinforcing portion 11e of this embodiment is a substrate supporting portion that projects upward from the flange portion 11d.

As described above, since the upper end surface (that is, the contact surface 11n) of the inner reinforcing portion 11p is arranged above the upper end surface of the tubular portion 11g, the lower surface of the circuit board 6 and the tubular portion 11g are vertically arranged. A gap is formed between the upper end surface and the upper surface (see FIG. 1). That is, in the vertical direction, a gap is formed between the lower surface of the circuit board 6 and the upper surface of the bottom portion 11c, and the circuit board 6 is separated from the bottom portion 11c without coming into contact with the bottom portion 11c. It is fixed to.

A protrusion 11r for positioning the circuit board 6 in a direction orthogonal to the vertical direction and fixing the circuit board 6 is formed on the upper surface of the inner reinforcing portion 11p. The protrusion 11r projects upward from the upper surface of the inner reinforcing portion 11p. The protrusion 11r is inserted into an insertion hole 6a formed in the circuit board 6. A welded portion 11s is formed at the tip (upper end) of the protrusion 11r to prevent the circuit board 6 from being displaced upward by coming into contact with the upper surface of the circuit board 6.

That is, the circuit board 6 applies heat or pressure to the upper ends of the protrusions 11r in a state where the circuit board 6 having the protrusions 11r inserted through the insertion holes 6a is pressed against the contact surface 11n (the upper end face of the inner reinforcing portion 11p). In addition, the upper ends of the protrusions 11r are fixed to the partition member 11 by fusion (melting). 3 and 4 show the state before the upper end portion of the protrusion 11r is melted (that is, before the welding is performed).

When viewed from the front-rear direction, the two protrusions 11r of the three protrusions 11r are arranged in the installation range of the board-side connector 30 in the left-right direction (see FIG. 2). In the present embodiment, the two protrusions 11r are arranged at the same position in the left-right direction, and are arranged on a straight line parallel to the front-rear direction. That is, in this embodiment, the two protrusions 11r arranged at positions displaced from each other in the front-rear direction overlap with each other in the installation range of the board-side connector 30 when viewed from the front-rear direction.

A welded portion (not shown) for preventing the stator 5 from being displaced upward is formed on an outer end portion in the radial direction of the upper surface of the outer reinforcing portion 11q. The welded portion is formed by applying heat or pressure to the protrusion 11t formed on the upper surface of the outer reinforcing portion 11q to melt (deform) the protrusion 11t. 2 to 4, the state of the protrusion 11t before forming the welded portion is illustrated.

(Main effects of this embodiment)
As described above, in the present embodiment, the gap is formed between the lower surface of the circuit board 6 and the upper surface of the bottom portion 11c in the vertical direction, and the circuit board 6 is formed on the bottom portion 11c that supports the upper end portion of the rotor 4. Not in contact. Further, in the present embodiment, the lower surface of the circuit board 6 is in contact with the upper end surfaces of the three reinforcing portions 11e connected to the outer peripheral surface of the cylindrical portion 11b and the upper surface of the flange portion 11d, and the circuit board 6 has The protrusion 11r formed on the upper end surface positions and is fixed in a direction orthogonal to the vertical direction.

Therefore, in the present embodiment, when the rotor 4 rotates, the vibration generated on the upper end side of the rotor 4 is not transmitted to the circuit board 6 without passing through the cylindrical portion 11b and the reinforcing portion 11e, and is generated on the lower end side of the rotor 4. The vibration is transmitted to the circuit board 6 only through the cylindrical portion 11b, the collar portion 11d, and the reinforcing portion 11e. That is, in the present embodiment, it becomes possible to lengthen the transmission path until the vibration generated in the rotor 4 during rotation is transmitted to the circuit board 6. Therefore, in the present embodiment, it is possible to suppress the vibration caused by the rotation of the rotor 4 from being transmitted to the circuit board 6.

Further, in the present embodiment, it is possible to suppress the vibration caused by the rotation of the rotor 4 from being transmitted to the circuit board 6, so that the malfunction of the circuit board 6 caused by the vibration during the rotation of the rotor 4 occurs. Can be suppressed. For example, it becomes possible to suppress problems such as peeling of the soldered portion of the electronic component to the circuit board 6 and peeling of the circuit pattern formed on the circuit board 6. Further, for example, when the magnetic sensor for detecting the rotational position of the rotor 4 is mounted on the circuit board 6, it is possible to suppress the displacement of the magnetic sensor due to the vibration during the rotation of the rotor 4. become. Therefore, it becomes possible to suppress a decrease in the detection accuracy of the rotational position of the rotor 4.

In this embodiment, the upper end surface of the reinforcing portion 11e, which has the function of ensuring the strength of the partition wall member 11 and the function of preventing contact between the drive coils 23 that are adjacent in the circumferential direction, supports the circuit board 6 from below. At the same time, the circuit board 6 is positioned in the vertical direction. Therefore, in this embodiment, the configuration of the partition member 11 can be simplified.

In this embodiment, the upper end surface of the inner reinforcing portion 11p, which is wider in the radial direction than the outer reinforcing portion 11q, is the contact surface 11n with which the lower surface of the circuit board 6 contacts. Therefore, in this embodiment, the area of the contact surface 11n with which the lower surface of the circuit board 6 contacts can be increased. Therefore, in this embodiment, the state of the circuit board 6 fixed to the partition member 11 can be stabilized.

In the present embodiment, when viewed from the front-rear direction, the two protrusions 11r of the three protrusions 11r are arranged in the installation range of the board-side connector 30 in the left-right direction. Therefore, in the present embodiment, even if the load when inserting/removing the insertion/removal side connector 31 into/from the board side connector 30 acts on the protrusion 11r, it is possible to suppress damage to the protrusion 11r.

(Other embodiments)
The embodiment described above is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention.

In the above-described embodiment, the width of the inner reinforcing portion 11p in the radial direction may be equal to the width of the outer reinforcing portion 11q in the radial direction, or may be narrower than the width of the outer reinforcing portion 11q in the radial direction. .. Further, in the above-described embodiment, the lower surface of the circuit board 6 may be in contact with the entire upper end surface of the reinforcing portion 11e. Further, in the above-described embodiment, the partition member 11 may include a plurality of columnar substrate support portions protruding upward from the flange portion 11d, instead of the plurality of reinforcement portions 11e. In this case, the substrate support portion is formed in, for example, a polygonal column shape such as a square column shape or a column shape, and is not connected to the outer peripheral surface of the cylindrical portion 11b. In this case, the lower surface of the circuit board 6 is in contact with the upper end surface of the board supporting portion.

In the above-described embodiment, the motor 3 may include a fixed shaft that rotatably supports the rotor 4 instead of the rotating shaft 14. In this case, the upper end of the fixed shaft is fixed to the lower surface side of the bottom 11c, and the bottom 11c supports the upper end of the rotor 4 via the fixed shaft. Further, in the above-described embodiment, the board-side connector 30 may not be mounted on the circuit board 6. In this case, for example, one end of the lead wire is soldered and fixed to the circuit board 6.

In the above-described embodiment, the number of salient pole portions 24b included in the stator core 24 may be four or more. Further, in the above-described embodiment, the motor 3 may be an outer rotor type motor. Furthermore, in the above-described embodiment, the motor 3 is used in the pump device 1, but the motor 3 may be used in a device other than the pump device 1.

DESCRIPTION OF SYMBOLS 1 Pump device 2 Impeller 3 Motor 4 Rotor 5 Stator 6 Circuit board 6a Insertion hole 10 Pump chamber 11 Partition member 11a Partition wall 11b Cylindrical part 11c Bottom part 11d Collar part 11e Reinforcing part (substrate support part)
11n Contact surface 11r Protrusion 11s Welding portion 14 Rotating shaft 15 Driving magnet 17 Bearing 23 Driving coil 30 Board side connector 31 Insertion/extraction side connector X Insertion/removal direction Y Orthogonal direction Z1 1st direction Z2 2nd direction

Claims (8)

In a motor having a rotor and a stator,
A partition wall member having a partition wall arranged between the rotor and the stator; and a circuit board which is a flat rigid board for controlling the motor,
The thickness direction of the circuit board and the axial direction of the rotor are the same,
If one of the axial directions of the rotor is the first direction and the opposite direction to the first direction is the second direction,
The partition wall closes a cylindrical cylindrical portion arranged between the rotor and the stator in a radial direction of the rotor, a first direction end of the cylindrical portion, and an end portion of the rotor in the first direction. With a supporting bottom,
The circuit board is arranged on the first direction side of the bottom portion,
The partition wall member includes a flange portion that spreads in a flange shape from the second direction end of the cylindrical portion to the outside in the radial direction of the rotor, and a plurality of substrate support portions that protrude from the flange portion in the first direction side,
The surface on the second direction side of the circuit board contacts end surfaces on the first direction side of the plurality of board supporting portions,
A protrusion for positioning the circuit board and fixing the circuit board in a direction orthogonal to the axial direction of the rotor is formed on the end surface of the board supporting portion on the first direction side,
The circuit board has a plurality of insertion holes through which the protrusions are inserted,
A motor having a gap formed between a surface of the circuit board on the second direction side and a surface of the bottom portion on the first direction side in the axial direction of the rotor. The rotor includes a rotating shaft and a driving magnet fixed to the rotating shaft,
The motor according to claim 1, wherein a bearing that supports an end portion of the rotating shaft on the first direction side is fixed to the bottom portion. A welded portion is formed at the tip of the protrusion to prevent the circuit board from shifting toward the first direction by coming into contact with the surface of the circuit board on the first direction side. The motor according to claim 1 or 2. The stator includes a plurality of drive coils arranged at regular intervals in the circumferential direction of the rotor,
The substrate supporting portion is formed in a flat plate shape that is connected to the outer peripheral surface of the cylindrical portion and the surface of the flange portion on the first direction side, and is arranged between each of the plurality of drive coils in the circumferential direction of the rotor. The motor according to any one of claims 1 to 3, wherein The end surface on the first direction side of more than half of the radial direction of the rotor of the board supporting portion is a contact surface with which the surface on the second direction side of the circuit board contacts. The motor according to any one of Items 1 to 4. On the circuit board, a board-side connector made of one of a male connector and a female connector is mounted,
The board-side connector, the insertion-and-removal-side connector consisting of the other one of the male connector and the female connector is removable,
The insertion/removal direction of the insertion/removal side connector with respect to the board side connector is orthogonal to the axial direction of the rotor,
When the direction orthogonal to the axial direction of the rotor and the inserting/removing direction is an orthogonal direction,
The motor according to claim 1, wherein at least two of the protrusions are arranged in an installation range of the board-side connector in the orthogonal direction when viewed in the insertion/removal direction. The at least two protrusions arranged at positions displaced from each other in the insertion/removal direction overlap with each other in the installation range of the board-side connector in the orthogonal direction when viewed from the insertion/removal direction. Item 6. A motor according to item 6. A motor according to any one of claims 1 to 7, and an impeller attached to the rotor,
A pump device in which the impeller is arranged and a part of a pump chamber through which a fluid passes is defined by the partition member.

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