JP2018046613A - Motor and pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor that can enhance the output of the motor while securing strength of a bulkhead arranged between a rotor and a stator and enhance the output of the motor while preventing short-circuit between coils for driving without enlarging the outer shape of the motor.SOLUTION: A motor comprises a bulkhead member 11 having a bulkhead 11a arranged between a rotor and a stator. The bulkhead 11a comprises a tube part 11b in a tubular shape arranged between a driving magnet of the rotor and a salient part of a stator core in a radial direction, a bottom part 11c blocking one end of the tube part 11b and a flange part 11d broadening from the other end of the tube part 11b. The bulkhead member 11 comprises a plurality of reinforcing parts 11g arranged between a plurality of driving coils respectively in a circumferential direction. The reinforcing parts 11g are formed to lead to the tube part 11b and the flange part 11d, and outside ends of the reinforcing parts 11g are arranged closer to outside in the radial direction than outside ends of the driving coils in the radial direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a motor having a partition wall disposed between a rotor and a stator. Moreover, this invention relates to a pump apparatus provided with this motor.

  Conventionally, a motor used as a drive source of a pump device is known (see, for example, Patent Document 1). The motor described in Patent Document 1 is a so-called canned motor, and includes a rotor, a stator disposed on the outer peripheral side of the rotor, and a partition member having a partition (can) disposed between the rotor and the stator. ing. The rotor includes a driving magnet. The stator includes a plurality of driving coils and a stator core having a plurality of salient pole portions around which each of the plurality of driving coils is wound.

  Further, in the motor described in Patent Document 1, the partition wall is formed in a bottomed cylindrical shape with a flange, the cylindrical portion, the bottom portion that closes one end of the cylindrical portion, and the radially outer side from the other end of the cylindrical portion. It has a buttock that spreads out. The partition functions to prevent the fluid in the pump chamber in which the rotor is arranged from flowing into the place where the stator is arranged. Further, in this motor, the front end surface of the salient pole portion of the stator core is opposed to the outer peripheral surface of the driving magnet via the cylindrical portion of the partition wall.

JP 2012-67659 A

  The inventor of the present application is considering increasing the output of the motor in a canned motor having a partition wall disposed between the rotor and the stator. In order to increase the output of the motor, the distance between the tip surface of the salient pole portion of the stator core and the driving magnet may be reduced. However, in order to reduce the distance between the tip end surface of the salient pole portion of the stator core and the driving magnet, the thickness of the cylindrical portion of the partition must be reduced, and the strength of the partition may be reduced. In order to increase the output of the motor, the number of turns of the drive coil may be increased. However, if the number of turns of the drive coil is increased without increasing the outer shape of the motor, the adjacent drive in the circumferential direction of the rotor There is a possibility that a short circuit may occur between the driving coils adjacent in the circumferential direction because the distance between the driving coils becomes short.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a motor having a partition wall disposed between a rotor and a stator, which can increase the output of the motor while ensuring the strength of the partition wall, and does not increase the outer shape of the motor. However, an object of the present invention is to provide a motor capable of increasing the output of the motor while preventing a short circuit between the driving coils. Moreover, the subject of this invention is providing a pump apparatus provided with this motor.

  In order to solve the above-described problems, a motor according to the present invention includes a rotor having a driving magnet, a stator that is formed in a cylindrical shape and disposed on the outer peripheral side of the rotor, and a partition wall that is disposed between the rotor and the stator. The stator includes an insulating member, a plurality of driving coils, and a stator core having a plurality of salient pole portions around which each of the plurality of driving coils is wound via the insulating member, The plurality of salient pole portions are arranged at regular intervals in the circumferential direction of the rotor, and the partition wall is disposed between the driving magnet and the salient pole portion in the radial direction of the rotor and is a cylindrical shape that covers the outer peripheral surface of the driving magnet. A cylindrical portion, a bottom portion that closes one end of the cylindrical portion, and a flange portion that extends radially outward from the other end of the cylindrical portion, and the partition wall member is disposed between each of the plurality of driving coils in the circumferential direction. When provided with a plurality of flat plate-shaped reinforcing portions In addition, the reinforcing portion is formed so as to be connected to the cylindrical portion and the flange portion, and the outer end of the reinforcing portion in the radial direction is more radial than the outer end of the driving coil in the radial direction. It is arranged on the outside.

  In the motor of the present invention, the partition member includes a plurality of flat plate-shaped reinforcing portions connected to the cylindrical portion and the flange portion. Therefore, in the present invention, the thickness of the cylindrical portion is reduced in order to reduce the distance between the tip surface of the salient pole portion of the stator core arranged on the outer peripheral side of the cylindrical portion and the driving magnet arranged on the inner peripheral side of the cylindrical portion. Even if the thickness is reduced, it is possible to ensure the strength of the partition wall (specifically, the strength of the cylindrical portion). That is, according to the present invention, it is possible to reduce the distance between the tip surface of the salient pole portion and the driving magnet while ensuring the strength of the partition wall, and as a result, it is possible to increase the output of the motor.

  In the motor of the present invention, the partition member formed of an insulating material includes a reinforcing portion that is disposed between each of the plurality of drive coils in the circumferential direction. The reinforcing portion is formed so as to be connected to the cylindrical portion and the flange portion, and the outer end of the reinforcing portion in the radial direction is disposed on the outer side in the radial direction than the outer end of the driving coil in the radial direction. Therefore, in the present invention, even if the number of turns of the drive coil increases and the distance between the drive coils adjacent in the circumferential direction of the rotor becomes short, the reinforcing portion disposed between the drive coils in the circumferential direction It becomes possible to prevent a short circuit between the driving coils. Therefore, in the present invention, it is possible to increase the number of turns of the driving coil while preventing a short circuit between the driving coils without increasing the outer shape of the motor, and as a result, the output of the motor can be increased. It becomes possible.

  In the motor of the present invention, since the reinforcing portion is disposed between the driving coils in the circumferential direction, the stator can be positioned in the circumferential direction using the reinforcing portion.

  In the present invention, when the side of the rotor in the axial direction where the bottom portion is disposed is the first direction side, the first direction end of the reinforcing portion is disposed closer to the first direction than the first direction end of the driving coil. It is preferable that If comprised in this way, it will become possible to prevent reliably the short circuit between the coils for a drive.

  In the present invention, the stator includes a plurality of insulating members attached to each of the plurality of salient pole portions, the stator core includes an annular outer peripheral ring portion that constitutes the outer peripheral surface of the stator core, and the plurality of salient pole portions include the outer periphery. The insulating member protrudes inward in the radial direction from the ring portion, and the insulating member includes an outer peripheral side cover portion that covers the inner surface of the outer peripheral ring portion in the radial direction, and the reinforcing portion is between the outer peripheral side cover portions that are adjacent in the circumferential direction. It is preferable to provide the protrusion part arrange | positioned. If comprised in this way, it will become possible to position the outer end of the reinforcement part in radial direction using an outer peripheral side cover part.

  In the present invention, the motor includes a magnetic sensor that detects the magnetic poles on the outer peripheral surface of the driving magnet, and the first direction of the reinforcing portion is defined as the first direction side of the axial direction of the rotor. It is preferable that a concave portion in which the magnetic sensor is disposed is formed at the end. If comprised in this way, it will become possible to position a magnetic sensor accurately with respect to a stator by the comparatively simple structure using the recessed part formed in a reinforcement part. Further, since the magnetic sensor can be accurately positioned with respect to the stator, the relative rotational position of the rotor with respect to the stator can be detected with high accuracy.

  In this invention, it is preferable that the thickness of the reinforcement part is thicker than the thickness of a cylinder part. If comprised in this way, even if the thickness of a cylinder part is made thinner, it becomes possible to ensure the intensity | strength of a partition. Therefore, it is possible to make the distance between the tip surface of the salient pole part and the driving magnet closer while ensuring the strength of the partition wall, and as a result, it is possible to effectively increase the output of the motor.

  In the present invention, the motor includes, for example, a circuit board disposed outside the partition wall and a resin sealing member that covers the circuit board and the stator. In this case, since the circuit board and the stator are covered with the resin sealing member, the waterproofness of the stator and the circuit board can be improved. In this case, the heat generated in the stator and the circuit board can be dissipated using the resin sealing member. Therefore, it is possible to suppress an increase in the internal temperature of the motor.

  In this case, stress may act on the partition wall due to the injection pressure of the resin when forming the resin sealing member and the expansion of the bubbles in the resin sealing member when the resin sealing member is solidified. However, in the present invention, since the reinforcing portion connected to the cylindrical portion and the flange portion is formed, even if this stress acts on the partition wall, it is possible to suppress the deformation of the partition wall. Moreover, in this invention, since the reinforcement part is arrange | positioned between the drive coils in the circumferential direction, it becomes possible to reduce the usage-amount of resin which comprises a resin sealing member.

  In the present invention, the partition wall member includes a cylindrical outer peripheral wall portion that is connected to the flange portion and covers the stator and the circuit board from the outer side in the radial direction, between the outer peripheral wall portion in the radial direction and the stator, and in the radial direction. A gap is preferably formed between the outer peripheral wall portion and the circuit board. In this case, when the resin is injected from the bottom side when forming the resin sealing member, the injected resin easily flows through the gap to the collar side. Therefore, the circuit board and the stator can be reliably covered by the resin sealing member.

  The motor of the present invention can be used for a pump device including an impeller fixed to a rotor and a case body fixed to a partition member and covering the impeller. In this pump device, it is possible to increase the output of the motor while ensuring the strength of the partition wall. Further, in this pump device, it is possible to increase the output of the motor while preventing a short circuit between the driving coils without increasing the outer shape of the motor.

  As described above, in the motor and the pump device of the present invention, it is possible to increase the output of the motor while ensuring the strength of the partition wall, and prevent a short circuit between the driving coils without increasing the outer shape of the motor. However, it becomes possible to increase the output of the motor.

It is sectional drawing of the pump apparatus concerning embodiment of this invention. It is a perspective view of the stator shown in FIG. It is sectional drawing of the stator shown in FIG. It is a perspective view of the partition member shown in FIG. FIG. 5 is a plan view of a state where the stator shown in FIG. 2 is attached to the partition wall member shown in FIG. 4.

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

(Schematic configuration of the pump device)
FIG. 1 is a cross-sectional view of a pump device 1 according to an embodiment of the present invention. In the following description, the Z1 direction side in FIG. 1 is referred to as the “upper” side, and the opposite side Z2 direction side in FIG. 1 is referred to as the “lower” side.

  The pump device 1 of this embodiment is a type of pump called a canned pump (canned motor pump), and includes an impeller 2 and a motor 3 that rotates the impeller 2. The motor 3 is a DC brassless motor, and includes a rotor 5, a stator 6, and a circuit board 7 for controlling the motor 3. The rotor 5 is disposed so that the axial direction of the rotor 5 coincides with the vertical direction. That is, the vertical direction is the axial direction of the rotor 5. In the following description, the radial direction of the rotor 5 is referred to as “radial direction”, and the circumferential direction (circumferential direction) of the rotor 5 is referred to as “circumferential direction”.

  The impeller 2, the rotor 5, and the stator 6 are disposed inside a pump case that includes a housing 8 that constitutes a part of the motor 3 and a case body 9 that is fixed to the lower end portion of the housing 8. The housing 8 and the case body 9 are fixed to each other by screws not shown. The case body 9 is formed with a fluid suction port 9a and a fluid discharge port 9b.

  A region surrounded by the housing 8 and the case body 9 is a pump chamber 10 through which the fluid sucked from the suction port 9a passes toward the discharge port 9b. A sealing member (not shown) for securing the sealing property of the pump chamber 10 is disposed at a joint portion between the housing 8 and the case body 9. The housing 8 includes a partition member 11 having a partition wall 11 a disposed between the pump chamber 10 and the stator 6 so as to separate the pump chamber 10 and the stator 6, and a cover 12 covering the upper side of the partition member 11. I have.

  The partition wall 11a is formed in a bottomed cylindrical shape with a flange, and includes a cylindrical portion 11b, a bottom portion 11c, and a flange portion 11d. The cylinder part 11b is formed in the cylinder shape. Specifically, the cylinder part 11b is formed in a cylindrical shape. The bottom portion 11c closes the upper end of the cylindrical portion 11b, and the lower end of the cylindrical portion 11b is open. The flange portion 11d is formed in an annular shape so as to spread outward from the lower end of the cylindrical portion 11b in the radial direction.

  Moreover, the partition member 11 is provided with the cylindrical outer peripheral wall part 11e arrange | positioned at the outer peripheral side of the cylinder part 11b. The outer peripheral wall portion 11e is connected to the flange portion 11d. Specifically, the lower end of the outer peripheral wall portion 11e is connected to the outer end of the flange portion 11d in the radial direction. A specific configuration of the partition member 11 will be described later. In addition, the upper side (Z1 direction side) of the present embodiment is the first direction side that is the side where the bottom portion 11c is arranged in the axial direction of the rotor 5.

  The rotor 5 includes a rotating shaft 13, a driving magnet 14, and a cylindrical sleeve 15. The rotating shaft 13 is disposed so that the axial direction of the rotating shaft 13 coincides with the vertical direction. The sleeve 15 is fixed to the outer peripheral surface of the upper end side portion of the rotating shaft 13. The drive magnet 14 is fixed to the outer peripheral surface of the sleeve 15. The length of the drive magnet 14 (length in the vertical direction) is equal to the length of the sleeve 15. On the outer peripheral surface of the driving magnet 14, N poles and S poles are alternately magnetized in the circumferential direction of the driving magnet 14. The driving magnet 14 and the sleeve 15 are disposed on the inner peripheral side of the cylindrical portion 11b.

  The impeller 2 is fixed to the lower end portion of the rotating shaft 13. That is, the impeller 2 is fixed to the rotor 5. The impeller 2 is disposed inside the pump chamber 10 and is covered with the case body 9. The rotary shaft 13 is rotatably supported by two bearings 16 and 17 arranged so as to sandwich the sleeve 15 in the vertical direction. The bearing 16 disposed on the upper side of the sleeve 15 is attached to the bottom 11c of the partition wall 11a. The bearing 17 disposed below the sleeve 15 is held by a bearing holding member 18. The bearing holding member 18 is disposed on the inner peripheral side of the cylindrical portion 11b of the partition wall 11a.

  An annular seal member 19 is disposed below the bearing 17 and the bearing holding member 18. The inner peripheral surface of the seal member 19 is in contact with the outer peripheral surface of the rotating shaft 13, and the outer peripheral surface of the seal member 19 is in contact with the inner peripheral surface of the cylindrical portion 11b. A cover 20 that closes the opening at the lower end of the cylindrical portion 11 b is disposed below the seal member 19. The cover 20 is fitted and fixed to the inner peripheral side of the cylindrical portion 11b. The bearing holding member 18 and the seal member 19 are held by the cover 20 on the inner peripheral side of the cylindrical portion 11b.

  The stator 6 includes a plurality of driving coils 23, a stator core 24, and an insulator 25 as an insulating member, and is formed in a cylindrical shape as a whole. Specifically, the stator 6 is formed in a substantially cylindrical shape. The stator 6 is disposed so that the axial direction of the stator 6 coincides with the vertical direction. The stator 6 is disposed on the outer peripheral side of the rotor 5 via the partition wall 11 a, and the partition wall 11 a is disposed between the rotor 5 and the stator 6. Specifically, the stator 6 is disposed on the outer peripheral side of the cylindrical portion 11b and on the upper side of the flange portion 11d. Moreover, the stator 6 is arrange | positioned at the inner peripheral side of the outer peripheral wall part 11e, and the outer peripheral surface of the stator 6 is covered with the outer peripheral wall part 11e from the outer side of radial direction. A specific configuration of the stator 6 will be described later.

  The circuit board 7 is a printed board on which a drive circuit for the motor 3 and the like are formed. The circuit board 7 is a rigid board such as a glass epoxy board, and is formed in a substantially disc shape. The circuit board 7 is arranged so that the thickness direction of the circuit board 7 coincides with the vertical direction. Further, the circuit board 7 is fixed to the bottom portion 11 c and is disposed outside the partition wall 11 a and is disposed above the stator 6. The circuit board 7 is disposed on the inner peripheral side of the outer peripheral wall portion 11e, and the outer peripheral surface of the circuit board 7 is covered with the outer peripheral wall portion 11e from the outside in the radial direction.

  A magnetic sensor 28 (see FIG. 1) for detecting the magnetic poles on the outer peripheral surface of the driving magnet 14 is mounted on the circuit board 7. The motor 3 of this embodiment is a three-phase brushless motor, and three magnetic sensors 28 are mounted on the circuit board 7. The magnetic sensor 28 is, for example, a Hall element. The magnetic sensor 28 is mounted on the circuit board 7 so as to protrude downward from the circuit board 7. The detection surface of the magnetic sensor 28 is opposed to the outer peripheral surface of the upper end side portion of the driving magnet 14 via the cylindrical portion 11b.

  The cover 12 is formed in a bottomed cylindrical shape, and is arranged so that the opening side of the cover 12 faces downward. The cover 12 is fixed to the upper end side of the outer peripheral wall portion 11e so as to close the opening at the upper end of the outer peripheral wall portion 11e. The stator 6 and the circuit board 7 are disposed in a region defined by the partition wall 11a, the outer peripheral wall portion 11e, and the cover 12. Further, this region is filled with a resin sealing member P that covers the stator 6 and the circuit board 7. The resin sealing member P of this embodiment is a potting resin, and when the resin sealing member P is filled, before the cover 12 is attached to the partition member 11, the resin is injected from the upper side of the partition member 11. The

(Structure of stator)
FIG. 2 is a perspective view of the stator 6 shown in FIG. FIG. 3 is a cross-sectional view of the stator 6 shown in FIG.

  As described above, the stator 6 includes the plurality of driving coils 23, the stator core 24, and the insulator 25. The stator 6 of this embodiment includes nine driving coils 23. 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 from the outer peripheral ring portion 24a toward the inner side in the radial direction. The stator core 24 of this embodiment includes nine salient pole portions 24b. The plurality of salient pole portions 24b are formed at an equiangular pitch and are arranged at regular intervals in the circumferential direction. The number of drive coils 23 included in the stator 6 may be 8 or less, or 10 or more.

  The outer peripheral ring portion 24a is formed in an annular shape. The outer peripheral surface of the outer peripheral ring portion 24 a constitutes the outer peripheral surface of the stator core 24. That is, the outer peripheral ring portion 24 a constitutes the outer peripheral surface of the stator core 24. Further, when viewed from the vertical direction, the outer peripheral surface of the outer peripheral ring portion 24 a is the outer peripheral surface of the stator 6. That is, the outer peripheral ring portion 24 a is a maximum outer diameter portion of the stator 6.

  The salient pole portion 24b includes a salient pole tip portion 24c that is a tip portion of the salient pole portion 24b, and a connecting portion 24d that connects the salient pole tip portion 24c and the outer peripheral ring portion 24a. The salient pole tip 24c is formed in a substantially arc shape extending from the tip (radially inner end) of the connecting portion 24d formed in a straight line toward both sides in the circumferential direction when viewed from the vertical direction. The inner side surface (tip surface) of the salient pole tip portion 24c in the radial direction is opposed to the outer peripheral surface of the drive magnet 14 via the cylindrical portion 11b.

  The insulator 25 is formed of an insulating material having an insulating property. Specifically, the insulator 25 is made of resin. The insulator 25 is attached to each salient pole portion 24b. That is, the stator 6 includes a plurality of insulators 25 attached to each of the plurality of salient pole portions 24b. Specifically, the stator 6 includes the same number (ie, nine) of insulators 25 as the salient pole portions 24b.

  The insulator 25 is formed in a cylindrical shape with hooks having flanges at both ends, and is attached to the salient pole portion 24b so that the axial direction of the insulator 25 formed in a cylindrical shape and the radial direction of the stator 6 coincide with each other. It has been. That is, the insulator 25 includes a rectangular cylindrical tube portion 25a that covers the connecting portion 24d, a flange-shaped inner flange portion 25b that extends from the inner end of the cylindrical portion 25a in the radial direction to both sides in the circumferential direction and both sides in the vertical direction, It is comprised from the outer end of the cylinder part 25a in radial direction from the outer side edge part 25c of the eaves shape extended to the both sides of a circumferential direction, and both sides of an up-down direction (refer FIG. 3). The insulator 25 can be divided at the center position in the vertical direction of the insulator 25.

  The inner flange portion 25b covers the outer surface of the salient pole tip portion 24c in the radial direction and a part of both upper and lower surfaces of the salient pole tip portion 24c. The outer flange 25c covers a part of the inner side surface of the outer peripheral ring part 24a in the radial direction and a part of both upper and lower surfaces of the outer peripheral ring part 24a. As described above, the insulator 25 is attached to each salient pole portion 24b and arranged in the circumferential direction. A slight gap is formed between the outer flanges 25c adjacent in the circumferential direction, as shown in FIG. The outer flange portion 25c of this embodiment is an outer peripheral side covering portion that covers the inner side surface of the outer peripheral ring portion 24a in the radial direction.

  The driving coil 23 is wound around the salient pole portion 24b via an insulator 25. That is, each of the plurality of driving coils 23 is wound around each of the plurality of salient pole portions 24 b via the insulator 25. Specifically, the driving coil 23 is wound around the connecting portion 24d via the cylindrical portion 25a. The driving coil 23 is disposed between the inner flange portion 25b and the outer flange portion 25c in the radial direction. The end of the drive coil 23 is electrically connected to the circuit board 7, and current is supplied from the circuit board 7 to the drive coil 23.

(Configuration of partition member)
FIG. 4 is a perspective view of the partition wall member 11 shown in FIG. FIG. 5 is a plan view showing a state in which the stator 6 shown in FIG. 2 is attached to the partition wall member 11 shown in FIG.

  The partition member 11 is formed of an insulating material having an insulating property. Specifically, the partition member 11 is made of resin. As described above, the partition wall member 11 includes the partition wall 11a including the cylindrical portion 11b, the bottom portion 11c, and the flange portion 11d, and the outer peripheral wall portion 11e disposed on the outer peripheral side of the partition wall 11a. In addition, the partition wall member 11 is disposed between the annular flange portion 11f extending from the lower end side of the outer peripheral surface of the outer peripheral wall portion 11e to the outer side in the radial direction and the plurality of driving coils 23 in the circumferential direction. 11g of reinforcing part. The partition member 11 of this embodiment includes nine reinforcing portions 11g. In addition, illustration of the collar part 11f is abbreviate | omitted in FIG.

  The cylindrical portion 11 b is disposed between the driving magnet 14 and the salient pole portion 24 b in the radial direction, and covers the outer peripheral surface of the driving magnet 14. A central portion of the bottom portion 11c in the radial direction is a bottomed cylindrical protruding portion 11h protruding upward. A bearing 16 is attached to the inner peripheral side of the protruding portion 11h. Further, the protruding portion 11 h is inserted through a through hole formed at the center of the circuit board 7. The upper end surface of the case body 9 is in contact with the lower surface of the flange portion 11f. The case body 9 is fixed to the flange portion 11f with the upper end surface of the case body 9 in contact with the lower surface of the flange portion 11f. That is, the case body 9 is fixed to the partition wall member 11.

  The outer peripheral wall portion 11e includes a cylindrical first wall portion 11j that covers the entire stator 6 from the outside in the radial direction, and a cylindrical second wall portion 11k that covers the entire circuit board 7 from the outside in the radial direction. Has been. That is, the outer peripheral wall portion 11e covers the stator 6 and the circuit board 7 from the outside in the radial direction. The lower end of the first wall portion 11j is connected to the radially outer end of the flange portion 11d. The lower end of the second wall portion 11k is connected to the upper end surface of the first wall portion 11j. The first wall portion 11j and the second wall portion 11k formed in a cylindrical shape are arranged on the same axis. The inner diameter of the second wall portion 11k is larger than the inner diameter of the first wall portion 11j, and the outer diameter of the second wall portion 11k is smaller than the outer diameter of the first wall portion 11j. A cylindrical portion of the cover 12 formed in a bottomed cylindrical shape is disposed on the outer peripheral side of the second wall portion 11k.

  The inner diameter of the first wall portion 11j is slightly larger than the outer diameter of the outer peripheral ring portion 24a, and a gap S1 is formed between the first wall portion 11j and the stator 6 in the radial direction ( (See FIG. 1). The inner diameter of the second wall portion 11j is larger than the outer diameter of the circuit board 7, and a gap S2 is formed between the second wall portion 11j and the circuit board 7 in the radial direction (FIG. 1). reference). That is, a gap S1 is formed between the outer peripheral wall part 11e and the stator 6 in the radial direction, and a gap S2 is formed between the outer peripheral wall part 11e and the circuit board 7 in the radial direction.

  The reinforcing part 11g is formed in a flat plate shape. Specifically, the reinforcing portion 11g is formed in a substantially rectangular flat plate shape. The reinforcing portion 11g is formed so as to be connected to the cylindrical portion 11b and the flange portion 11d. That is, the reinforcing part 11g is formed in a rib shape connected to the cylindrical part 11b and the flange part 11d, and the entire radial inner end of the reinforcing part 11g is connected to the outer peripheral surface of the cylindrical part 11b, and the lower end of the reinforcing part 11g. Is connected to the upper surface of the flange 11d. The plurality of reinforcing portions 11g spread radially with respect to the axial center of the rotating shaft 13 when viewed from the top and bottom directions, and are arranged at regular intervals in the circumferential direction. The thickness of the reinforcing portion 11g (thickness in the circumferential direction) is thicker than the thickness (thickness in the radial direction) of the cylindrical portion 11b.

  The outer end portion of the reinforcing portion 11g in the radial direction is a protruding portion 11p having a narrow width in the circumferential direction. The protrusion part 11p is arrange | positioned in the center position of the reinforcement part 11g in the circumferential direction. The outer end of the reinforcing portion 11g in the radial direction is disposed on the outer side in the radial direction with respect to the outer end of the driving coil 23 in the radial direction. Specifically, as shown in FIG. 5, the protrusion 11p is disposed between the outer flanges 25c of the insulators 25 adjacent in the circumferential direction. That is, the protrusion 11p is disposed in a part of the gap between the outer flanges 25c in the circumferential direction. In addition, the end surface in the circumferential direction of the inner flange portion 25b is in contact with the side surface (the side surface in the circumferential direction) of the inner end portion of the reinforcing portion 11g in the radial direction (see FIG. 5).

  As shown in FIG. 1, the upper end of the reinforcing portion 11 g is disposed above the upper end of the driving coil 23. Further, the upper end of the reinforcing portion 11g is disposed slightly below the upper surface of the portion of the bottom portion 11c excluding the protruding portion 11h. A concave portion 11r in which the magnetic sensor 28 is disposed is formed at the upper end of three reinforcing portions 11g out of the nine reinforcing portions 11g so as to be recessed downward. The recess 11r is formed at the radially inner end portion of the reinforcing portion 11g. The magnetic sensor 28 is disposed in the recess 11r in contact with the bottom surface (lower surface) of the recess 11r.

(Main effects of this form)
As described above, in the present embodiment, the partition wall member 11 includes the plurality of flat plate-like reinforcing plates 11g connected to the cylindrical portion 11b and the flange portion 11d, and the plurality of reinforcing plates 11g are viewed from the up and down direction. Furthermore, it spreads radially with respect to the axis center of the rotating shaft 13. Therefore, in this embodiment, the strength of the partition wall 11a (specifically, even if the thickness of the cylindrical portion 11b is reduced in order to reduce the distance between the tip end surface (radial inner surface) of the salient pole portion 24b and the driving magnet 14). Specifically, it is possible to ensure the strength of the cylindrical portion 11b. That is, in this embodiment, it is possible to reduce the distance between the tip surface of the salient pole portion 24b and the driving magnet 14 while ensuring the strength of the partition wall 11a, and as a result, the output of the motor 3 can be increased. become.

  In particular, in this embodiment, since the thickness of the reinforcing portion 11g is thicker than the thickness of the cylindrical portion 11b, the strength of the partition wall 11a can be ensured even if the thickness of the cylindrical portion 11b is made thinner. . Therefore, in this embodiment, it is possible to further reduce the distance between the tip surface of the salient pole portion 24b and the driving magnet 14 while ensuring the strength of the partition wall 11a, and as a result, the output of the motor 3 can be effectively reduced. It becomes possible to increase.

  In this embodiment, a reinforcing portion 11g connected to the cylindrical portion 11b and the flange portion 11d is disposed between the plurality of driving coils 23 in the circumferential direction. Further, in this embodiment, the outer end of the reinforcing portion 11g in the radial direction is disposed on the outer side in the radial direction than the outer end of the driving coil 23 in the radial direction. Therefore, in this embodiment, even if the number of turns of the drive coil 23 increases and the distance between the drive coils 23 adjacent in the circumferential direction becomes shorter, the reinforcing portion disposed between the drive coils 23 in the circumferential direction. 11g makes it possible to prevent a short circuit between the drive coils 23.

  In particular, in this embodiment, since the upper end of the reinforcing portion 11g is disposed above the upper end of the drive coil 23, the number of turns of the drive coil 23 increases, and the drive coil 23 between adjacent drive coils 23 in the circumferential direction increases. Even if the distance is short, it is possible to reliably prevent a short circuit between the driving coils 23. Therefore, in this embodiment, it is possible to increase the number of turns of the driving coil 23 while preventing a short circuit between the driving coils 23 without enlarging the outer shape of the motor 3. The output can be increased.

  In this embodiment, a reinforcing portion 11g connected to the cylindrical portion 11b and the flange portion 11d is disposed between the plurality of driving coils 23 in the circumferential direction. Therefore, in this embodiment, the stator 6 can be positioned in the circumferential direction using the reinforcing portion 11g. Further, in this embodiment, since the protruding portion 11p, which is the outer end portion of the reinforcing portion 11g in the radial direction, is disposed between the outer flange portions 25c of the insulators 25 adjacent in the circumferential direction, the outer peripheral flange portion 25c is used. Thus, the outer end of the reinforcing portion 11g in the radial direction can be positioned.

  In this embodiment, a concave portion 11r in which the magnetic sensor 28 is disposed is formed at the upper end of the reinforcing portion 11g. Therefore, in this embodiment, the magnetic sensor 28 can be accurately positioned with respect to the stator 6 with a relatively simple configuration using the recess 11r formed in the reinforcing portion 11g. Further, since the magnetic sensor 28 can be accurately positioned with respect to the stator 6, the relative rotational position of the rotor 5 with respect to the stator 6 can be detected with high accuracy.

  In this embodiment, the stator 6 and the circuit board 7 are covered with the resin sealing member P. Therefore, in this embodiment, it becomes possible to improve the waterproofness of the stator 6 and the circuit board 7. Further, in this embodiment, since the heat generated in the stator 6 and the circuit board 7 can be dissipated using the resin sealing member P, the increase in the internal temperature of the motor 3 can be suppressed. Become.

  Note that stress may act on the partition wall 11a due to the expansion of bubbles in the resin sealing member P when the resin sealing member P, which is potting resin, is solidified. Since the reinforcing portion 11g connected to the portion 11d is formed, even when this stress acts on the partition wall 11a, it is possible to suppress the deformation of the partition wall 11a. Further, in this embodiment, since the reinforcing portion 11g is disposed between the driving coils 23 in the circumferential direction, it is possible to reduce the amount of resin used for the resin sealing member P.

  In this embodiment, a gap S1 is formed between the outer peripheral wall part 11e and the stator 6 in the radial direction, and a gap S2 is formed between the outer peripheral wall part 11e and the circuit board 7 in the radial direction. Therefore, in this embodiment, when the resin constituting the resin sealing member P is injected from the upper side of the partition member 11, the injected resin easily flows into the flange 11d side through the gaps S1 and S2. Therefore, in this embodiment, the stator 6 and the circuit board 7 can be reliably covered by the resin sealing member P.

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

  In the embodiment described above, the upper end of the reinforcing portion 11g is disposed above the upper end of the driving coil 23. However, the upper end of the reinforcing portion 11g is disposed at the same position as the upper end of the driving coil 23 in the vertical direction. It may be arranged, or may be arranged below the upper end of the drive coil 23. Even in this case, the strength of the partition wall 11a can be ensured, and a short circuit between the driving coils 23 adjacent in the circumferential direction can be prevented. In the embodiment described above, the outer end portion of the reinforcing portion 11g in the radial direction is the protruding portion 11p having a narrow circumferential width, but the circumferential width of the reinforcing portion 11g is constant in the radial direction. There may be.

  In the above-described embodiment, the circuit board 7 is disposed in the region defined by the partition wall 11a, the outer peripheral wall portion 11e, and the cover 12. However, an opening is formed in the cylindrical portion of the cover 12 formed in a bottomed cylindrical shape. In addition to being formed, a part of the circuit board 7 may protrude from the opening to the outside of the cover 12.

  In the embodiment described above, the resin sealing member P is potting resin, but the resin sealing member P may be formed of BMC (Bulk Molding Compound). In this case, the cover 12 becomes unnecessary. In this case, the outer peripheral wall portion 11 e may not be formed on the partition wall member 11. In this case, although stress acts on the partition wall 11a due to the injection pressure of the resin when forming the resin sealing member P, the partition member 11 has a reinforcing portion 11g connected to the cylindrical portion 11b and the flange portion 11d. Therefore, even if this stress acts on the partition wall 11a, the deformation of the partition wall 11a can be suppressed.

  In the embodiment described above, the stator 6 and the circuit board 7 are covered with the resin sealing member P. However, the stator 6 and the circuit board 7 may not be covered with the resin sealing member P. Moreover, in the form mentioned above, although the thickness of the reinforcement part 11g is thicker than the thickness of the cylinder part 11b, the thickness of the reinforcement part 11g may be below the thickness of the cylinder part 11b. In this case, the number of turns of the driving coil 23 can be increased. Moreover, in the form mentioned above, although the motor 3 is used for the pump apparatus 1, the motor 3 may be used for apparatuses other than the pump apparatus 1. FIG.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Impeller 3 Motor 5 Rotor 6 Stator 7 Circuit board 9 Case body 11 Partition member 11a Partition 11b Cylindrical part 11c Bottom part 11d Gutter part 11e Outer peripheral wall part 11g Reinforcement part 11p Protrusion part 11r Concave part 14 Driving magnet 23 Drive Coil 24 Stator core 24a Peripheral ring portion 24b Salient pole portion 25 Insulator (insulating member)
25c Outer collar (outer side cover)
28 Magnetic sensor P Resin sealing member S1, S2 Gap Z1 First direction side

Claims (8)

A rotor having a drive magnet, a stator formed in a cylindrical shape and disposed on the outer peripheral side of the rotor, and a partition member having a partition disposed between the rotor and the stator,
The stator includes an insulating member, a plurality of driving coils, and a stator core having a plurality of salient pole portions around which the plurality of driving coils are wound via the insulating member,
The plurality of salient pole portions are arranged at regular intervals in the circumferential direction of the rotor,
The partition wall is disposed between the driving magnet and the salient pole portion in the radial direction of the rotor, and has a cylindrical cylindrical portion that covers an outer peripheral surface of the driving magnet, and a bottom portion that closes one end of the cylindrical portion. And a flange extending outward in the radial direction from the other end of the cylindrical portion,
The partition member includes a plurality of flat plate-shaped reinforcing portions disposed between the plurality of driving coils in the circumferential direction, and is formed of an insulating material.
The reinforcing portion is formed so as to be connected to the cylindrical portion and the flange portion,
An outer end of the reinforcing portion in the radial direction is arranged on an outer side in the radial direction with respect to an outer end of the driving coil in the radial direction. When the side where the bottom of the axial direction of the rotor is arranged is the first direction side,
2. The motor according to claim 1, wherein the first direction end of the reinforcing portion is disposed closer to the first direction than the first direction end of the driving coil. The stator includes a plurality of the insulating members attached to the plurality of salient pole portions,
The stator core includes an annular outer peripheral ring portion that constitutes an outer peripheral surface of the stator core,
The plurality of salient pole portions protrude from the outer peripheral ring portion toward the inside in the radial direction,
The insulating member includes an outer peripheral side covering portion that covers an inner surface of the outer peripheral ring portion in the radial direction,
The motor according to claim 1, wherein the reinforcing portion includes a protrusion disposed between the outer peripheral side covering portions adjacent in the circumferential direction. A magnetic sensor for detecting magnetic poles on the outer peripheral surface of the driving magnet;
When the side where the bottom of the axial direction of the rotor is arranged is the first direction side,
The motor according to any one of claims 1 to 3, wherein a concave portion in which the magnetic sensor is disposed is formed at the end in the first direction of the reinforcing portion.   The motor according to any one of claims 1 to 4, wherein the thickness of the reinforcing portion is thicker than the thickness of the cylindrical portion.   6. The motor according to claim 1, further comprising a circuit board disposed outside the partition wall, and a resin sealing member that covers the circuit board and the stator. The partition member includes a cylindrical outer peripheral wall portion that is connected to the flange portion and covers the stator and the circuit board from the outside in the radial direction,
The clearance gap is formed between the said outer peripheral wall part and the said stator in the said radial direction, and between the said outer peripheral wall part and the said circuit board in the said radial direction. Motor.   A pump device comprising: the motor according to claim 1; an impeller fixed to the rotor; and a case body fixed to the partition member and covering the impeller.

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