WO2018047603A1

WO2018047603A1 - Pump motor

Info

Publication number: WO2018047603A1
Application number: PCT/JP2017/029604
Authority: WO
Inventors: 友治中村; 裕之上田
Original assignee: 日本電産テクノモータ株式会社
Priority date: 2016-09-09
Filing date: 2017-08-18
Publication date: 2018-03-15
Also published as: JP2019198132A

Abstract

This pump motor is provided with: a rotating part which rotates around a central axis that extends in the vertical direction; and a stationary part which is provided outside the rotating part in the radial direction. The rotating part is provided with: a shaft which is provided along the central axis; a rotor core which is provided outside the shaft in the radial direction; a magnet which is attached to the outer circumferential surface of the rotor core; and a first base which is in contact with the lower surface of the rotor core, and which is provided outside the shaft in the radial direction. The magnet is provided with a protruding part which protrudes further downwards than the lower surface of the rotor core. The first base is provided with a first protrusion of which the upper surface is in contact with the lower surface of the rotor core, and of which the outer circumferential surface is in contact with the inner surface of the protruding part in the radial direction.

Description

Pump motor

The present invention relates to a pump motor.

Japanese Patent Application Laid-Open No. 2010-220473 discloses a rotor in which a plurality of substantially arc-shaped permanent magnets are bonded to the surface of a rotor yoke made of a high permeability material such as iron by a resin mold. In the rotor disclosed in Japanese Patent Application Laid-Open No. 2010-220473, the vicinity of the center in the circumferential direction of the permanent magnet is not covered with resin. That is, in the rotor, the magnet is exposed, and the position of the magnet can be easily grasped from the outside.

JP 2010-220473 A

In the molding process, when the rotor core and the magnet are set in the mold, they need to be arranged at appropriate positions. For example, in a pump motor, a rotor core and a magnet may be covered with a cover member. When molding and magnetization are performed in a state where the rotor core and the magnet are covered with the cover member, it is difficult to grasp the positions of the magnet and the rotor core covered with the cover member from the outside. *

In view of the above, it is an object of the present invention to provide a pump motor that can appropriately position the rotor core and the magnet. Moreover, an object of this invention is to provide the motor for pumps which can grasp | ascertain appropriately the position of the rotor core and magnet covered with the cover member.

An exemplary pump motor of the present invention includes a rotating portion that rotates about a central axis that extends in the up-down direction, and a stationary portion that is disposed radially outside the rotating portion. The rotating portion is in contact with a shaft disposed along the central axis, a rotor core disposed on a radially outer side of the shaft, a magnet attached to an outer peripheral surface of the rotor core, and a lower surface of the rotor core, And a first base disposed on a radially outer side of the shaft. The magnet has a protruding portion that protrudes below the lower surface of the rotor core. The first base has a first convex portion whose upper surface is in contact with the lower surface of the rotor core and whose outer peripheral surface is in contact with the radially inner surface of the protruding portion.

According to the exemplary present invention, it is possible to provide a pump motor that can appropriately position the rotor core and the magnet. Further, according to the present invention, it is possible to provide a pump motor that can appropriately grasp the positions of the rotor core and the magnet covered by the cover member.

FIG. 1 is a schematic diagram showing a schematic configuration of a pump system according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the pump motor according to the embodiment of the present invention. FIG. 3 is an enlarged view showing the rotating unit shown in FIG. 2 in an enlarged manner. 4 is a schematic cross-sectional view taken along the line XX in FIG. FIG. 5 is a schematic perspective view of a first base included in the pump motor according to the embodiment of the present invention. FIG. 6 is a plan view schematically showing the relationship between the first convex portion and the protruding portion of the magnet. FIG. 7 is an enlarged cross-sectional view schematically showing the relationship between the first convex portion and the protruding portion of the magnet. FIG. 8 is an enlarged cross-sectional view schematically showing the relationship between the cover member and the first base. FIG. 9 is a schematic perspective view of a first base included in the pump motor according to the embodiment of the present invention. FIG. 10 is a schematic perspective view showing the relationship between the first base and the rotating plate. FIG. 11 is a schematic perspective view showing the relationship between the second base and the stationary plate. FIG. 12 is a schematic perspective view of the second base with the stationary part removed. FIG. 13 is a schematic perspective view of the second base to which the stationary plate is attached as viewed from below.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the extending direction of the central axis A of the motor shown in FIG. 2 is simply referred to as “axial direction”, and the radial direction and the circumferential direction around the central axis A of the motor are simply “radial direction” and “circumferential direction”. I will call it. In this specification, the axial direction when the motor is arranged in the direction shown in FIG. 2 is defined as the vertical direction. The vertical direction is simply a name used for explanation, and does not limit the actual positional relationship or direction. *

<1. Schematic Configuration of Pump System> First, a schematic configuration of a pump system having an exemplary pump motor of the present invention will be described. FIG. 1 is a schematic diagram showing a schematic configuration of a pump system 100 according to an embodiment of the present invention. As shown in FIG. 1, the pump system 100 includes a pump unit 101, a running water cable 102, and a water storage tank 103. *

The pump unit 101 is immersed in a ground water source, for example. The pump unit 101 is immersed in a water source having a depth of about 50 to 100 m from the ground, for example. The pump unit 101 includes a pump motor 1 and an impeller unit 2. The impeller unit 2 is connected to the pump motor 1. The impeller unit 2 has blades (not shown) that rotate by driving the pump motor 1. *

By driving the pump motor 1, the blades of the impeller portion 2 are rotated. The water is sucked up by the rotation of the impeller 2 blades. The water sucked up by the impeller unit 2 is pumped to the ground through the running water cable 102. The pumped water is stored in the water storage tank 103. *

<2. Schematic Configuration of Pump Motor> FIG. 2 is a schematic cross-sectional view of the pump motor 1 according to the embodiment of the present invention. FIG. 2 is a view cut along a cut surface including the central axis A of the motor 1. As shown in FIG. 2, the motor 1 includes a rotating unit 10 and a stationary unit 20. The rotating unit 10 rotates about a central axis A extending in the vertical direction. The stationary part 20 is disposed on the radially outer side of the rotating part 10. *

The rotating unit 10 includes a shaft 11 disposed along the central axis A. The shaft 11 is disposed at the rotation center of the rotating unit 10. In the present embodiment, the shaft 11 is a columnar member extending in the axial direction. The shaft 11 functions as an output shaft. The impeller portion 2 described above is connected to the upper end portion of the shaft 11. *

The rotating unit 10 includes a rotor core 12 that is disposed on the radially outer side of the shaft 11. The rotor core 12 is a cylindrical member that extends in the vertical direction. In the present embodiment, the rotor core 12 has a configuration in which a plurality of magnetic steel plates such as silicon steel plates are laminated in the axial direction. The rotor core 12 may be formed by joining a plurality of core pieces. *

The rotating unit 10 has a magnet 13 attached to the outer peripheral surface of the rotor core 12. In the present embodiment, the magnet 13 is fixed to the outer peripheral surface of the rotor core 12 with an adhesive. The magnet 13 is a permanent magnet for a field, and may be, for example, a sintered magnet or a bonded magnet. In the present embodiment, a plurality of magnets 13 are arranged in the circumferential direction. *

The stationary part 20 includes a stator core 21, a coil 22, and an insulator 23. The stator core 21 has a configuration in which a plurality of magnetic steel plates such as silicon steel plates are laminated in the axial direction. The stator core 21 may be formed by joining a plurality of core pieces. Specifically, the stator core 21 has an annular core back and a plurality of teeth protruding radially inward from the core back. The coil 22 is wound around each tooth via an insulator 23. The insulator 23 is an insulating member that electrically insulates the stator core 21 and the coil 22 from each other. When a drive current is supplied to the coil 22, a magnetic flux in the radial direction is generated in the teeth that are magnetic cores. As a result, circumferential torque is generated in the rotating unit 10, and the rotating unit 10 rotates about the central axis A. *

In the present embodiment, the stationary part 20 further includes a stator can 24. The stator can 24 is a cylindrical member extending in the vertical direction. In the present embodiment, the stator can 24 is made of a metal such as stainless steel. The stator can 24 is disposed on the radially outer side of the rotating unit 10 and on the radially inner side of the stator core 21. The stator can 24 is held by the upper bracket 32 at the upper part in the axial direction. A gap is formed between the rotating unit 10 and the stator can 24. A lubricant is present in this gap. This lubricant is water, for example, and may contain a preservative such as propylene glycolose. In addition, the stationary part 20 includes a resin 25 that covers at least a part of the stator core 21, the coil 22, the insulator 23, and the stator can 24. *

The motor 1 further includes a casing 30 that houses the rotating unit 10 and the stationary unit 20. In the present embodiment, the casing 30 includes a frame 31, an upper bracket 32, and a lower bracket 33. The frame 31 is a cylindrical metal member that extends in the vertical direction. The frame 31 is disposed on the radially outer side of the stationary part 20. The stationary part 20 is fixed to the frame 31. The upper bracket 32 is attached to the upper end of the frame 31. The lower bracket 33 is attached to the lower end of the frame 31. *

The shaft 11 is rotatably supported by an upper bearing 34 provided on the upper bracket 32 and a lower bearing 35 provided on the lower bracket 33. In the present embodiment, the upper bearing 34 and the lower bearing 35 are constituted by sleeve bearings. The upper bearing 34 and the lower bearing 35 may be composed of other bearings, for example, ball bearings. The upper bearing 34 and the lower bearing 35 function as radial bearings. The pump motor 1 also has a thrust bearing that receives a load in the thrust direction. This will be described later. In the present embodiment, the upper end portion of the shaft 11 protrudes upward from the upper bracket 32. The protruding portion of the shaft 11 is connected to the impeller portion 2 described above. *

<3. Details of Rotating Unit> <3-1. Structure of Resin Part> FIG. 3 is an enlarged view showing the rotating part 10 shown in FIG. 2 in an enlarged manner. 4 is a schematic cross-sectional view taken along the line XX in FIG. *

As shown in FIGS. 3 and 4, the rotating portion 10 includes a first resin portion R 1 that is interposed between the shaft 11 and the rotor core 12 and fixes them. The first resin portion R 1 contacts the outer peripheral surface of the shaft 11 and contacts the inner peripheral surface of the rotor core 12. The first resin portion R1 has an annular structure that extends in the vertical direction. In the present embodiment, as shown in FIG. 4, the first resin portion R1 has a protrusion R1a protruding in the radial direction. The protrusion R1a extends in the vertical direction of the rotor core. A plurality of protrusions R1a are arranged at equal intervals in the circumferential direction. In addition, the first resin portion R1 has a pair of flat surface portions R1b disposed to face each other with the shaft 11 interposed therebetween on the outer periphery. A pair of plane part R1b is extended in an up-down direction. The plurality of protrusions R1a and the pair of flat surfaces R1b can serve as a detent for the rotor core 12. *

The rotating part 10 is integrated with the first resin part R1 interposed between the shaft 11 and the rotor core 12. For this reason, possibility that the rotation part 10 will be deform | transformed with a hydraulic pressure can be reduced. Further, since the shaft 1 and the rotor core 12 can be integrated by a molding process using a mold, a process of assembling the shaft 11 and the rotor core 12 by manual press-fitting or the like can be omitted. For this reason, workability | operativity at the time of the assembly of the rotation part 10 can be improved. *

As shown in FIG. 3, the rotating part 10 has a second resin part R 2 arranged on the upper side of the magnet 13. In the present embodiment, the second resin portion R 2 covers the entire top surface of the magnet 13 and contacts the top surface of the magnet 13. The second resin portion R2 has a cylindrical shape extending in the vertical direction. As shown in FIG. 4, in the present embodiment, six magnets 13 are arranged at equal intervals in the circumferential direction. The second resin portion R2 covers the upper surfaces of all six magnets 13. The number of magnets 13 is an example, and the number may be changed as appropriate. The second resin portion R2 is connected to the first resin portion R1. The second resin portion R2 can prevent the upper surface of the magnet 13 from being exposed and prevent the magnet 13 from rusting.

The second resin portion R2 preferably covers the entire top surface of the magnet 13 and does not expose the top surface of the magnet 13. However, in some cases, a part of the upper surface of the magnet 13 may be exposed. In the present embodiment, the upper cover 14 is disposed on the second resin portion R2. The upper cover 14 can be made of a metal such as stainless steel. The upper cover 14 may not be provided depending on circumstances. *

As shown in FIGS. 3 and 4, the rotating portion 10 includes a third resin portion R 3 that is disposed on the radially outer side of the magnet 13. In the present embodiment, the third resin portion R3 covers the entire outer peripheral surface of the magnet 13. The third resin portion R 3 has a cylindrical shape extending in the vertical direction and covers all the outer peripheral surfaces of the six magnets 13. More specifically, the third resin portion R3 fills a gap between the magnets 13 adjacent in the circumferential direction. The third resin portion R3 is connected to the second resin portion R2. The third resin portion R3 can prevent the outer peripheral surface of the magnet 13 from being exposed and prevent the magnet 13 from rusting. *

The third resin portion R3 preferably covers the entire outer peripheral surface of the magnet 13 and does not expose the outer peripheral surface of the magnet 13. However, in some cases, a part of the outer peripheral surface of the magnet 13 may be exposed. *

As shown in FIGS. 3 and 4, the rotating unit 10 includes a cylindrical cover member 15 disposed on the radially outer side of the magnet 13. In the present embodiment, the cover member 15 is a cylindrical member extending in the vertical direction. The cover member 15 is made of a metal such as stainless steel. The third resin portion R3 is in contact with the outer peripheral surface of the magnet 13 and the inner peripheral surface of the cover member 15. Since the magnet 13 and the cover member 15 are integrated by the third resin portion R3, the cover member 15 can be easily assembled by a molding process. *

As shown in FIG. 3, the rotating unit 10 has a first base 16 that is in contact with the lower surface of the rotor core 12 and is arranged on the radially outer side of the shaft 11. In the present embodiment, the first base 16 is made of metal. The first base 16 has a through hole 16a extending in the vertical direction at the center. In a plan view, the through hole 16a has a circular shape. The central axis A passes through the center of the through hole 16a. The shaft 11 is inserted into the through hole 16a. *

The rotating part 10 has a fourth resin part R4 interposed between the shaft 11 and the first base 16. In the present embodiment, the fourth resin portion R4 has a cylindrical shape extending in the vertical direction. The fourth resin portion R4 is in contact with the outer peripheral surface of the shaft 11 and the inner peripheral surface of the first base 16. The fourth resin portion R4 is connected to the first resin portion R1. As can be seen from the above, the first resin portion R1, the second resin portion R2, the third resin portion R3, and the fourth resin portion R4 are connected. Therefore, the first resin portion R1, the second resin portion R2, the third resin portion R3, and the fourth resin portion R4 can be formed by a single resin injection. In this configuration, the shaft 11 and the first base 16 can be integrated by a molding process using a mold. For this reason, according to this configuration, the step of assembling the shaft 11 to the first base 16 by manual press-fitting or the like can be omitted, and workability at the time of assembling the rotating unit 10 can be improved. *

As shown in FIG. 3, the rotating part 10 has a seal part 17 provided at the lower part of the first base 16. The seal portion 17 is in contact with the inner peripheral surface of the first base 16 and the outer peripheral surface of the shaft 11 over one circumference in the circumferential direction. Specifically, the first base 16 has an annular second convex portion 163 that extends downward on the lower surface, as will be described later. The seal portion 17 is in contact with the inner peripheral surface of the second convex portion 163 and the outer peripheral surface of the shaft 11. The seal portion 17 can prevent water from entering the inside of the rotating portion 10 from the lower surface side of the first base 16. *

<3-2. Positioning Structure> FIG. 5 is a schematic perspective view of the first base 16 included in the pump motor 1 according to the embodiment of the present invention. FIG. 5 is a view of the first base 16 as viewed obliquely from above. As shown in FIGS. 3 and 5, the first base 16 has three

cylindrical portions

16b, 16c, and 16d arranged in the vertical direction. The three cylindrical portions 16b to 16d are the same member. Compared to the uppermost first cylindrical portion 16b, the second cylindrical portion 16c located in the middle has a smaller radial size. Further, the lowermost third cylindrical portion 16d has a larger radial size than the first cylindrical portion 16b and the second cylindrical portion 16c. *

As shown in FIGS. 3 and 5, the first base 16 has a first convex portion 161. Specifically, the first convex portion 161 is formed on the upper surface of the first cylindrical portion 16b and extends upward. The first convex portion 161 is the same member as the first cylindrical portion 16a. The first convex portion 161 may be a separate member from the first cylindrical portion 16a. In the present embodiment, the first convex portion 161 has a regular hexagonal column shape extending in the axial direction. The central axis A passes through the center of the first convex portion 161 having a regular hexagonal column shape. The first convex portion 161 has a circular opening in plan view. The opening continues to the through hole 16a. As shown in FIG. 3, the rotor core 12 is placed on the upper surface of the first convex portion 161. In other words, the lower surface of the rotor core 12 is in contact with the upper surface of the first convex portion 161. The 1st convex part 161 positions the position of the circumferential direction and radial direction of the several magnet 13 attached to the rotor core 12 and the rotor core 12. As shown in FIG. This will be described below. *

As shown in FIG. 4, the outer peripheral surface of the rotor core 12 is provided with a plurality of projecting portions 12a that are arranged at intervals in the circumferential direction and project in the radial direction. In the present embodiment, the number of protrusions 12a is six, and they are arranged at equal intervals in the circumferential direction. The protrusion 12a has a trapezoidal shape in a plan view and extends in the vertical direction. The magnet 13 is disposed between the adjacent protrusions 12a. In this embodiment, the magnet 13 is arrange | positioned between all the adjacent protrusion parts 12a. Both end portions in the circumferential direction of each magnet 13 are in contact with the protrusion 12a. That is, the plurality of magnets 13 are attached to the rotor core 12 with their circumferential positions positioned. According to the configuration of the present embodiment, the plurality of protrusions 12a can be attached while positioning the circumferential positions of the plurality of magnets 13, thereby improving the workability of the assembly operation of the rotating unit 10. it can. *

In addition, as shown in FIG. 4, in this embodiment, the surface where the rotor core 12 and the magnet 13 oppose is the same shape. In detail, the surfaces where the rotor core 12 and the magnet 13 are opposed are in a state where the planes are opposed to each other. For this reason, the gap between the rotor core 12 and the magnet 13 can be eliminated and the magnet 13 can be arranged efficiently. In addition, the surface where the rotor core 12 and the magnet 13 are opposed may be in a state where the same curved surfaces are opposed to each other, for example. Also in this case, the gap between the rotor core 12 and the magnet 13 can be eliminated. *

As shown in FIG. 3, the magnet 13 has a protruding portion 13 a that protrudes below the lower surface of the rotor core 12. In the present embodiment, there are six magnets 13, but each magnet 13 has a protruding portion 13a. FIG. 6 is a plan view schematically showing the relationship between the first convex portion 161 and the protruding portion 13 a of the magnet 13. As shown in FIG. 6, the radially inner surface of the protruding portion 13 a contacts the outer peripheral surface of the first convex portion 161. Specifically, the radially inner plane of each protrusion 13 a comes into contact with the plane that forms the outer periphery of the first convex portion 161. Thereby, the rotor core 12 and the six magnets 13 are positioned in the radial direction. Moreover, since the plane of the protrusion 13a and the plane of the first protrusion 161 are in contact with each other, the rotation of the rotor core 12 with respect to the first base 16 is suppressed. For this reason, the rotor core 12 and the six magnets 13 positioned in the circumferential direction with respect to the rotor core 12 are positioned in the circumferential direction by the first convex portion 161. *

In the present embodiment, the first convex portion 161 has a regular hexagonal prism shape corresponding to the number of magnets 13 being six, but this is merely an example. The shape of the 1st convex part 161 may be changed into various shapes according to the number or shape of the magnet 13, for example. *

FIG. 7 is an enlarged cross-sectional view schematically showing the relationship between the first convex portion 161 and the protruding portion 13 a of the magnet 13. As shown in FIG. 7, the lower surface of the magnet 13 is separated from the first base 16 in the axial direction. In other words, there is a gap between the lower surface of the magnet 13 and the first base 16. This gap may be filled with resin. Positioning of the stator core 12 in the axial direction is not performed by the magnet 13, but is performed by contact between the stator core 12 body and the first convex portion 161. In this configuration, it is possible to avoid an axial force from being applied to the magnet 13 from the first base 16 when the rotating unit 10 is assembled. For this reason, it can suppress that the magnet 13 remove | deviates from the rotor core 12, or is damaged during the assembly operation of the rotation part 10. FIG. *

FIG. 8 is an enlarged cross-sectional view schematically showing the relationship between the cover member 15 and the first base 16. In FIG. 8, only one half of the cover member 15 and the first base 16 is shown. As shown in FIG. 8, a flange portion 162 protruding in the radial direction is provided on the outer periphery of the first base 16. Specifically, the flange portion 162 is an annular portion protruding in the radial direction from the outer peripheral surface of the first cylindrical portion 16b. The lower surface of the cover member 15 contacts the flange portion 162. The cover member 15 is positioned in the axial direction by a radial step formed by the flange portion 162. *

An annular groove may be provided on the upper surface of the flange portion 162, and the cover member 15 may be positioned by fitting the lower portion of the cover member 15 into the groove. In the present embodiment, the outer peripheral surface of the first cylindrical portion 16b and the inner peripheral surface of the cover member 15 are in contact with each other, and the cover member 15 is positioned in the radial direction by the first cylindrical portion 16b. . *

<3-3. Assembly Procedure of Rotating Unit> Here, an exemplary assembly procedure of the rotating unit 10 configured as described above will be described. First, the rotor core 12 is formed by laminating magnetic steel plates. Next, a plurality of magnets 13 are attached to the outer peripheral surface of the rotor core 12 with an adhesive. Each of the plurality of magnets 13 is positioned in the circumferential direction by the protrusion 12 a of the rotor core 12 and attached to the outer peripheral surface of the rotor core 12. Each of the plurality of magnets 13 protrudes downward from the lower surface of the rotor core 12 by a predetermined amount and is attached to the rotor core 12. In addition, the part protruded by the predetermined amount is the above-described protrusion 13a. *

The rotor core 12 to which the magnet 13 is attached is placed on the first convex portion 161. At this time, the radial inner plane of the protruding portion 13 a is brought into contact with the plane constituting the outer peripheral surface of the first convex portion 161 to adjust the position. The rotor core 12 and the magnet 16 are positioned by the first convex portion 161. Thereafter, the cover member 15 is attached to the first base 16. *

The rotor core 12 integrated with the first base 16 and the cover member 15 and the shaft 11 are positioned by a mold to perform a molding process. In the molding process, resin is poured into the cover member 15. After the molding process is completed, the upper cover 14 is attached to the upper side of the cover member 15, and the assembly of the rotating unit 10 is completed. Thereafter, the magnet 13 is magnetized. In the configuration of the present embodiment, after the rotor core 12 and the magnet 13 are positioned by the first convex portion 161, the molding process is performed. For this reason, the rotating part 10 can be assembled with the positional relationship of each component in an appropriate state. *

<3-4. Magnet Position Confirmation Structure> In the present embodiment, the magnet 13 is magnetized while the magnet 13 is covered by the cover member 15. Considering this point, the first base 16 has a position confirmation unit that allows confirmation of the position of the magnet 13 from the outside. Since the position of the magnet 13 covered with the cover member 15 can be confirmed by the position confirmation unit, the magnet 13 can be appropriately magnetized.

The position confirmation unit may be, for example, a marking such as a figure, a character, or a symbol formed on the first base 16, but in this embodiment, the structure formed on the first base 16 is used as the position confirmation unit. The In the present embodiment, the position confirmation unit has a surface parallel to the surface of the first convex portion 161 that is in contact with the radially inner surface of the protrusion 13a. According to this configuration, the position confirmation unit can be used as the positioning unit when setting the rotating unit 10 in the magnetizing machine that magnetizes the magnet 13, and the workability of magnetizing the magnet 13 is improved. Can be improved. Hereinafter, a more specific structure of the position confirmation unit of this embodiment will be described.

FIG. 9 is a schematic perspective view of the first base 16 included in the pump motor 1 according to the embodiment of the present invention. FIG. 9 is a view of the first base 16 as viewed obliquely from below. As shown in FIG. 9, the first base 16 has an annular second convex portion 163 that extends downward on the lower surface. The second convex portion 163 is the same member as the third cylindrical portion 16d. The second convex portion 163 may be a separate member from the third cylindrical portion 16d. *

The inner peripheral surface of the second convex portion 163 is circular in plan view. The inner peripheral surface of the second convex portion 163 surrounds the periphery of the through hole 16a. The central axis A passes through the center of the second convex portion 163. The 2nd convex part 163 has the 1st D cut surface 163a. The first D-cut surface 163a is a planar portion provided on the outer peripheral surface of the annular second convex portion 163. The first D-cut surface 163a is parallel to the central axis A. In the present embodiment, two first D-cut surfaces 163a are provided. The two first D-cut surfaces 163a are arranged symmetrically with respect to the central axis A. The number of first D-cut surfaces 163a is not limited to two, and the number may be changed as appropriate. *

In the present embodiment, the position confirmation part is the first D-cut surface 163a of the second convex part 163. The first D-cut surface 163a is parallel to two of the six planes constituting the outer peripheral surface of the first convex portion 161. In addition, these two planes are surfaces which contact the surface of the 1st convex part 161 on the radial inside of the protrusion part 13a. Each magnet 13 is in contact with one of six planes constituting the outer peripheral surface of the first convex portion 161 in a positioned state. For this reason, it is possible to grasp how the six magnets 13 are arranged by confirming the position of the first D-cut surface 163a. Since the D-cut surface of the second convex portion 163 is easily formed corresponding to the shape of the first convex portion 161, the position confirmation portion can be easily formed. *

The first D-cut surface 163a is preferably used as a positioning surface when the rotating unit 10 is set in a magnetizer for magnetizing the magnet 13. According to this, since the positioning using the first D-cut surface 163a also serves to confirm the position of the magnet 13, workability is improved. *

In addition, the structure of the position confirmation part demonstrated above is an illustration, For example, the structure of a position confirmation part may be changed suitably with the shape of the 1st convex part 161, the structure of a magnetizer, etc. FIG. *

<4. Details of Thrust Bearing> As shown in FIG. 2, the pump motor 1 includes a thrust bearing 40 that supports the shaft 11. The thrust bearing 40 includes a rotating plate 41 and a stationary plate 42. The rotating plate 41 is attached to the lower side of the first base 16. The rotating plate 41 rotates together with the rotating unit 10. The stationary plate 42 is disposed to face the rotating plate 41 in the axial direction. In the present embodiment, the stationary plate 42 is disposed below the rotating plate 41. Water that functions as a lubricant is interposed between the rotating plate 41 and the stationary plate 42. The thrust bearing 40 can smoothly rotate the rotating unit 10 that receives the axial force. *

In the present embodiment, the rotating plate 41 and the stationary plate 42 are made of silicon carbide (SiC). However, this is an exemplification, and the materials constituting the rotating plate 41 and the stationary plate 42 may be appropriately changed. For example, the rotating plate 41 and the stationary plate 42 may be made of carbon or the like. By using silicon carbide, wear during high-speed operation of the motor 1 can be reduced. Further, by using silicon carbide, it is possible to reduce wear of the rotating plate 41 and the stationary plate 42 when a load is applied in the axial direction and the rotating plate 41 and the stationary plate 42 contact each other. *

FIG. 10 is a schematic perspective view showing the relationship between the first base 16 and the rotating plate 41. As shown in FIG. 10, the first D-cut surface 163a is in contact with the inner peripheral surface of the rotating plate 42 provided in an annular shape. In the present embodiment, the rotating plate 41 has an annular shape. A first flat surface portion 41 a extending in a direction parallel to the central axis A is provided on the inner peripheral surface of the rotating plate 41. Two first flat portions 41a are provided, and the two first flat portions 41a are arranged symmetrically with the central axis A in between. The first D-cut surface 163a is disposed to face the first flat surface portion 41a, and both are in contact with each other. *

The first D-cut surface 163 a is paired with the first flat surface portion 41 a to prevent the rotating plate 41 from rotating with respect to the first base 16. The rotating plate 41 is positioned in the radial direction and the circumferential direction when the inner peripheral surface is in contact with the outer peripheral surface of the second convex portion 163. That is, the first base 16 can be fixed in a state where the rotary plate 41 is positioned. For example, an adhesive is used to fix the rotating plate 41 to the first base 16. The rotation stopper using the D-cut surface can be easily formed even when the rotating plate 41 is formed of a material such as SiC having excellent wear resistance. *

As shown in FIG. 2, a second base 43 is attached to the lower side of the stationary plate 42. FIG. 11 is a schematic perspective view showing the relationship between the second base 43 and the stationary plate 42. FIG. 12 is a schematic perspective view of the second base 43 with the stationary part 42 removed. FIG. 12 is a view as seen obliquely from above. *

As shown in FIG. 11, the stationary plate 42 is provided in an annular shape. More specifically, the stationary plate 42 has a second D-cut surface 42a on the outer periphery. The second D-cut surface 42 a is a flat portion provided on the outer periphery of the annular stationary plate 42. The second D-cut surface 42a is parallel to the central axis A. In the present embodiment, two second D-cut surfaces 42a are provided. The two second D-cut surfaces 42a are arranged symmetrically with respect to the central axis A. The number of second D-cut surfaces 42a is not limited to two, and the number may be changed as appropriate. *

As shown in FIG. 12, the second base 43 is provided in an annular shape. Around the central opening 43a of the second base 43, an annular wall portion 43b extending upward is provided. Further, the second base 43 has a rotation preventing portion 43c. The rotation stopper 43c is provided at the outer edge and extends upward. The rotation preventing portion 43c is provided with a second flat surface portion 43d. The second plane portion 43d is parallel to the central axis A. In the present embodiment, two second flat portions 43d are provided. The two second flat portions 43d are arranged symmetrically with the central axis A in between. *

The inner peripheral surface of the stationary plate 42 attached to the second base 43 is in contact with the outer peripheral surface of the wall portion 43b. Further, the second flat surface portion 43d is in contact with the second D-cut surface 42a. Specifically, the second flat surface portion 43d is disposed opposite to the second D-cut surface 42a, and both are in contact with each other. Accordingly, the stationary plate 42 can be fixed in a state of being positioned with respect to the second base 43. For example, an adhesive is used for fixing the stationary plate 42 to the second base 43. Even when the stationary plate 42 is formed of a material such as SiC having excellent wear resistance, it is easy to form the D-cut surface on the stationary plate 42. In the present embodiment, nothing is arranged on the upper surface of the rotation stopper 43c, but a part of the stationary plate 42 may be arranged. Thereby, the surface which slides with the rotating plate 41 can be increased. *

As shown in FIG. 11, the stationary plate 42 has unevenness arranged in the circumferential direction on the surface facing the rotating plate 41. The irregularities may be arranged at equal intervals, but in this embodiment, the irregularities are not arranged at equal intervals. Although the convex portion is of one type, the concave portion 42b includes two types of a pair of wide concave portions and a pair of narrow concave portions. The pair of wide recesses and the pair of narrow recesses are arranged symmetrically with respect to the central axis A, respectively. The recess 42 b formed in the stationary part 42 can efficiently guide water between the rotating plate 41 and the stationary plate 42. Moreover, the recessed part 42b can discharge | emit foreign substances, such as sand between the rotating plate 41 and the stationary plate 42, efficiently outside. *

As shown in FIG. 2, the second base 43 is supported by a pair of pins 44. The pair of pins 44 are fixed to the lower bracket 33. FIG. 13 is a schematic perspective view of the second base 43 to which the stationary plate 42 is attached as viewed from below. As shown in FIG. 13, a pair of pin holes 43 e are formed on the lower surface of the second base 43. In the present embodiment, the pin hole 43e is a spherical recess. The pair of pin holes 43e are arranged symmetrically with the central axis A in between. The upper ends of the pair of pins 44 are inserted into the pair of pin holes 43e. Accordingly, the pair of pins 44 supports the lower surface of the second base 43 and is disposed symmetrically with the central axis A interposed therebetween. The pair of pins 44 are provided at locations facing the recesses 42 b provided in the stationary plate 42. *

According to the configuration of the present embodiment, the stationary plate 42 can be tilted with the pair of pins 44 as fulcrums, so that the rotating unit 10 can be automatically aligned. As described above, since the pair of pins 44 and the concave portion 42 b face each other, the convex portion of the stationary plate 42 can be appropriately brought into contact with the rotating plate 41. *

<5. Others> The configuration of the embodiment described above and the modified example described as appropriate is merely an example of the present invention. The configuration of the embodiment and the modification may be changed as appropriate without departing from the technical idea of the present invention. In addition, the above-described embodiment and a plurality of modification examples may be combined and implemented within a possible range.

The present invention is suitable for a motor used for, for example, a submersible pump.

1 Pump motor 10 Rotating part 11 Shaft 12 Rotor core 12a Protruding part 13 Magnet Protruding part 15 Covering member 16 First part 17 Sealing part 20 Rotating part 41 Thrust bearing 41 Second base 43c Non-rotating part 43d Second flat part 44 Pin 161 161 First convex part 162 Flange part 163 Second convex part 163a First D-cut surface (position confirmation part) A Central axis R1 Resin part R2 Second resin part R3 Third resin part R4 4 of the resin portion

Claims

A pump motor,
A rotating part that rotates about a central axis extending in the vertical direction;
A stationary part disposed radially outside the rotating part;
Have
The rotating part is
A shaft disposed along the central axis;
A rotor core disposed radially outside the shaft;
A magnet attached to the outer peripheral surface of the rotor core;
A first base that is in contact with the lower surface of the rotor core and is disposed on a radially outer side of the shaft;
Have
The magnet has a protruding portion that protrudes below the lower surface of the rotor core,
The first base has a first convex portion having a first convex portion whose upper surface is in contact with the lower surface of the rotor core and whose outer surface is in contact with a radially inner surface of the protruding portion.
The rotating portion further includes a cylindrical cover member disposed on the radially outer side of the magnet,
The pump motor according to claim 1, wherein the first base includes a position confirmation unit that allows confirmation of the position of the magnet from the outside.
3. The pump motor according to claim 2, wherein the position confirmation portion has a surface parallel to a surface of the first convex portion that contacts a radially inner surface of the protruding portion.
The first base has an annular second convex portion extending downward on the lower surface;
The pump motor according to claim 2 or 3, wherein the position confirmation unit is a first D-cut surface of the second convex portion.
The pump motor according to any one of claims 1 to 4, wherein surfaces of the rotor core and the magnet facing each other have the same shape.
The outer peripheral surface of the rotor core is provided with a plurality of projecting portions projecting in the radial direction arranged at intervals in the circumferential direction,
The pump motor according to claim 1, wherein the magnet is disposed between the adjacent protrusions.
The pump motor according to any one of claims 1 to 6, wherein a lower surface of the magnet is separated from the first base in an axial direction.
The rotating portion further includes a cylindrical cover member disposed on the radially outer side of the magnet,
A flange portion protruding in the radial direction is provided on the outer periphery of the first base,
The pump motor according to any one of claims 1 to 7, wherein a lower surface of the cylindrical member is in contact with the flange portion.
The pump motor according to any one of claims 1 to 8, wherein the rotating portion further includes a first resin portion that is interposed between the shaft and the rotor core and fixes the both.
The pump motor according to any one of claims 1 to 9, wherein the rotating portion further includes a second resin portion disposed on the upper side of the magnet.
The pump motor according to any one of claims 1 to 10, wherein the rotating portion further includes a third resin portion disposed on a radially outer side of the magnet.
The rotating portion further includes a cylindrical cover member disposed on the radially outer side of the magnet,
The pump motor according to claim 11, wherein the third resin portion is in contact with an outer peripheral surface of the magnet and an inner peripheral surface of the cylindrical member.
The pump motor according to any one of claims 1 to 12, wherein the rotating portion further includes a fourth resin portion interposed between the shaft and the first base.
The rotating portion further includes a seal portion provided at a lower portion of the first base and in contact with an inner peripheral surface of the first base and an outer peripheral surface of the shaft over a circumferential circumference. The motor for pumps of any one of 1-13.
A thrust bearing for supporting the shaft;
The thrust bearing is
A rotating plate attached to the lower side of the first base and rotating together with the rotating part;
A stationary plate disposed opposite to the rotating plate in the axial direction;
The motor for pumps of any one of Claim 1 to 14 which has these.
The first base has an annular second convex portion extending downward on the lower surface,
The second convex portion has a first D-cut surface,
The pump motor according to claim 15, wherein the first D-cut surface is in contact with an inner peripheral surface of the rotating plate provided in an annular shape.
A second base is attached to the lower side of the stationary plate,
The stationary plate has a second D-cut surface on the outer periphery,
17. The pump motor according to claim 15, wherein the second base has a rotation stopper portion provided with a flat portion that contacts the second D-cut surface.
The second base is supported by a pair of pins,
18. The pump motor according to claim 17, wherein the pair of pins support a lower surface of the second base and are arranged symmetrically with respect to the central axis.
The pump motor according to any one of claims 15 to 18, wherein the stationary plate has irregularities arranged in a circumferential direction on a surface facing the rotating plate.