Motor and air supply device

Abstract

The invention provides a motor and a blower. The motor includes a rotor, a stator, and a labyrinth portion. The rotor is rotatable about a central axis extending in the axial direction. The stator has a stator core. A plurality of coil parts arranged in the circumferential direction are disposed on the stator core. The labyrinth portion has a pair of metal cylindrical members surrounding the central axis. The pair of metal cylindrical members has a pair of facing surfaces facing each other in the radial direction with a gap therebetween, and one of the facing surfaces surrounds the other.

Description

Technical Field

[0001] The invention relates to a motor and an air supply device. Background Art

[0002] Conventionally, a motor having a labyrinth structure consisting of a pair of radially opposed protrusions is known. For example, in a motor, a protrusion provided from a protrusion of an impeller toward a winding side and a protrusion formed on a rising portion of a bearing box are radially opposed to each other, forming a labyrinth structure. (Japanese Utility Model Publication No. 07-039263)

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Utility Model Application Laid-Open No. 07-039263 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in order to reduce weight and costs, the cup portion of the impeller and the rotor is formed of a resin material. Therefore, usually at least the protrusions on the impeller side such as the above are also made of resin. Compared with, for example, metal parts, the dimensional tolerance of resin parts tends to be larger, so it is difficult to reduce the gap between the opposing surfaces of the radially opposing protrusions of the labyrinth structure. In addition, if the dimensional tolerance is estimated to be smaller, there is a problem that there is at least partially no gap between the opposing surfaces of the protrusions. That is, it is possible that the protrusions on the impeller side or the rotor side are at least partially in contact with the protrusions on the bearing box side, so there is a possibility that the rotation of the motor is adversely affected due to the sliding of the two.

[0008] An object of the present invention is to further reduce a gap between opposing surfaces of a labyrinth portion of a motor while ensuring the gap.

[0009] Solutions to Solve Problems

[0010] An exemplary motor of the present invention comprises a rotor, a stator and a labyrinth. The rotor can rotate around a central axis extending in the axial direction. The stator has a stator core. A plurality of coils arranged in the circumferential direction are arranged on the stator core, and the labyrinth has a pair of metal cylindrical parts surrounding the central axis. The pair of metal cylindrical parts has a pair of opposing surfaces which are radially opposed with a gap therebetween and one side surrounds the other side.

[0011] An exemplary air blowing device of the present invention includes the above-mentioned motor and a moving blade. The moving blade is rotatable about the central axis together with the rotor of the motor.

[0012] Effects of the Invention

[0013] According to the exemplary motor and air blowing device of the present invention, it is possible to further reduce the gap while ensuring the gap between the facing surfaces of the labyrinth portion of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view showing a structural example of the air supply device.

[0015] Figure 2 It is a perspective view showing the appearance of the air supply device.

[0016] Figure 3 It is magnified Figure 1 A cross-sectional view of portion III surrounded by a dotted line.

[0017] Figure 4 It is magnified Figure 1 A cross-sectional view of portion IV surrounded by a dotted line.

[0018] Figure 5 It is magnified Figure 1 sectional view of portion V surrounded by a dotted line.

[0019] In the figure:

[0020] 100—air supply device, 101—motor, 102—moving blades, 103—cylindrical housing, 104—rib, 1—rotor, 10—shaft, 11—rotor hub, 12—protruding wall portion, 13—rotor cover portion, 14—rotor cylinder portion, 15—first peripheral wall portion, 16—magnet, 2—stator, 21—stator core, 22—insulator, 23—coil portion, 3—housing, 31—stator holder, 311—bearing, 312—recess, 313—front end portion, 32—base portion, 33—second peripheral wall portion, 4—circuit board, 41—external wiring, 42—cover Cover part, 6—waterproof layer, 61—first waterproof layer, 62—second waterproof layer, 63—third waterproof layer, 64—outer waterproof layer, 5—labyrinth part, 51—first labyrinth part, 52—second labyrinth part, 53—third labyrinth part, 54—outer labyrinth part, fi, fo—opposing surfaces, fi1, fo1—first opposing surfaces, fi2, fo2—second opposing surfaces, fi3, fo3—third opposing surfaces, foa, fob—outer opposing surfaces, CA—center axis, Da—one axial side, Db—the other axial side, Di—radially inward, Do—radially outward. DETAILED DESCRIPTION

[0021] Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings.

[0022] In addition, in this specification, in the air supply device 100 and the motor 101, the direction parallel to the central axis CA is referred to as the "axial direction". In the axial direction, the direction from the base portion 32 described later toward the rotor hub 11 is referred to as the "one axial direction Da", and the direction from the rotor hub 11 toward the base portion 32 is referred to as the "other axial direction Db". In addition, the direction orthogonal to the central axis CA is referred to as the "radial direction", and the rotation direction centered on the central axis CA is referred to as the "circumferential direction". The direction close to the central axis CA in the radial direction is referred to as the "radial inner direction Di", and the direction away from the central axis CA is referred to as the "radial outer direction Do".

[0023] In addition, in this specification, "annular" includes not only a shape that is a continuous one-stroke shape without gaps in the entire circumferential area around the central axis CA, but also a shape that has one or more gaps in a part of the entire area around the central axis CA. In addition, it also includes a shape that draws a closed curve on a curved surface intersecting the central axis CA with the central axis CA as the center.

[0024] In addition, in the positional relationship between any one of the orientations, lines, and planes and any other one, "parallel" includes not only a state where the two do not intersect at all no matter where they extend, but also a state where they are substantially parallel. In addition, "perpendicular" and "orthogonal" include not only a state where the two intersect each other at 90 degrees, but also a state where they are substantially perpendicular and a state where they are substantially orthogonal. That is, "parallel", "perpendicular", and "orthogonal" include a state where there is an angular offset in the positional relationship between the two without departing from the gist of the present invention.

[0025] In addition, these names are used only for explanation, and are not intended to limit actual positional relationships, directions, names, etc.

[0026] <1. Implementation Method>

[0027] Figure 1 It is a cross-sectional view showing a structural example of the air sending device 100 . Figure 2 2 is a perspective view showing the appearance of the air supply device 100. Figure 1 Indicates that it contains Figure 2 The cross-sectional structure when the air supply device 100 is hypothetically cut by the double-dashed line II and the plane of the central axis CA.

[0028] <1-1. Air supply device 100>

[0029] The air supply device 100 of this embodiment is an axial flow fan, which sends the airflow sucked from one axial direction Da to the other axial direction Db. However, this example does not exclude that the air supply device 100 is a structure other than an axial flow fan. For example, the air supply device 100 can be a blower or a centrifugal fan.

[0030] like Figure 1 and Figure 2 As shown, the air supply device 100 includes a motor 101 and a moving blade 102. The moving blade 102 can rotate with a rotor 1 described later of the motor 101 around a central axis CA. In the present embodiment, a plurality of moving blades 102 are arranged on the radially outer side of the rotor 1 and arranged in the circumferential direction. The motor 101 rotates the moving blade 102 in the circumferential direction, thereby causing the airflow to flow in the axial direction.

[0031] In addition, the air supply device 100 also includes a cylindrical housing 103 and ribs 104. The cylindrical housing 103 extends in the axial direction and surrounds the motor 101 and the moving blades 102. The cylindrical housing 103 is spaced apart from the motor 101 in the radial direction and forms a wind tunnel for airflow in the space between the cylindrical housing 103 and the motor 101. The ribs 104 extend at least in the radial direction, and a plurality of ribs 104 are arranged circumferentially on the other axial side Db of the wind tunnel. The ribs 104 function as stationary blades that rectify the airflow flowing in the wind tunnel. In addition, the ribs 104 connect the base portion 32 of the motor 101 and the other axial end of the cylindrical housing 103. That is, the radial inner end of the rib 104 is connected to the base portion 32. The radial outer end of the rib 104 is connected to the radial inner side surface of the cylindrical housing 103.

[0032] In the air supply device 100 of this embodiment, as described later, the gap between the opposing surfaces fi and fo in the labyrinth portion 5 of the motor 101 can be further reduced while ensuring the gap. Therefore, it is possible to suppress or prevent water and dust from entering the labyrinth portion 5 from the radially outer Do side to the radially inner Di side.

[0033] <1-2. Motor 101>

[0034] Next, refer to Figures 1 to 4 , a structural example of the motor 101 is described. Figure 3 It is magnified Figure 1 A cross-sectional view of portion III surrounded by a dotted line. Figure 4 It is magnified Figure 1 A cross-sectional view of portion IV surrounded by a dotted line.

[0035] like Figure 1 As shown, the motor 101 includes a rotor 1 , a stator 2 , a housing 3 , a circuit board 4 , a labyrinth 5 , and a waterproof layer 6 .

[0036] <1-2-1. Rotor 1>

[0037] The rotor 1 is rotatable about the central axis CA extending in the axial direction. As described above, the motor 101 includes the rotor 1. The rotor 1 has the shaft 10, the rotor hub 11, the protruding wall portion 12, the rotor cover portion 13, the rotor tube portion 14, the first peripheral wall portion 15, and the magnet 16.

[0038] The shaft 10 extends in the axial direction along the central axis CA and is rotatably supported by the bearing 311. As described above, the rotor 1 has the shaft 10. The shaft 10 can rotate around the central axis CA. That is, in the present embodiment, the shaft 10 is a rotating shaft. However, this example is not limited thereto, and the shaft 10 may also be a fixed shaft fixed together with the stator 2, or may not be rotatable around the central axis CA. In the case of a fixed shaft, a bearing is arranged between the shaft 10 and the rotor hub 11, and the bearing supports the rotor hub 11 rotatably relative to the shaft 10.

[0039] In this embodiment, if Figure 1 As shown, the rotor hub 11 is fixed to one axial end portion of the shaft 10. As described above, the rotor 1 has the rotor hub 11. The rotor hub 11 extends from one axial end portion of the shaft 10 toward the radially outward direction Do.

[0040] The protruding wall portion 12 is a metal cylindrical component extending in the axial direction, and surrounds the central axis CA. As described above, the rotor 1 has the protruding wall portion 12. The cylindrical protruding wall portion 12 extends from the other axial end surface of the rotor hub 11 to the other axial direction Db, and surrounds one axial end portion of the bearing 311. In addition, in the present embodiment, the protruding wall portion 12 is integrated with the rotor hub 11. However, it is not limited to this example, and the protruding wall portion 12 may also be a component different from the rotor hub 11.

[0041] The rotor cover 13 is arranged at an axially side Da relative to the stator 2 and extends in the radial direction. As described above, the rotor 1 has the rotor cover 13. Specifically, the rotor cover 13 is annular surrounding the rotor hub 11 and extends from the radially outer end of the rotor hub 11 to the radially outward Do.

[0042] The rotor barrel 14 is a cylindrical component extending in the axial direction, and is made of resin in this embodiment. However, this is not limited to this example. The rotor barrel 14 can also be made of metal. The rotor barrel 14 extends from the radial outer end of the rotor cover 13 to the other axial direction Db. As described above, the rotor 1 has the rotor barrel 14. In this embodiment, the rotor barrel 14 is a cylindrical truncated cone shape surrounding the stator 2, and Figure 1 The rotor tube portion 14 expands in the radially outward direction Do as it goes toward the other axial direction Db. However, the present invention is not limited to this example, and the rotor tube portion 14 may also be in the shape of a cylinder extending in the axial direction.

[0043] In the present embodiment, a plurality of moving blades 102 are arranged on the radially outer side surface of the rotor cylinder 14. That is, the rotor 1 has a plurality of moving blades 102. The plurality of moving blades 102 extend from the radially outer side surface of the rotor cylinder 14 to the radially outer side Do, respectively, and expand at least in the axial direction. The rotor cylinder 14, the rotor cover 13, and the plurality of moving blades 102 are integrated and constitute a single component. However, this example is not limited thereto, and at least one of the at least one moving blade 102, the rotor cover 13, and the rotor cylinder 14 may also be a separate body. In addition, the plurality of moving blades 102 may also be a component different from the rotor 1. For example, the motor 101 may have an impeller. The impeller may have an impeller base and a plurality of moving blades 102. The impeller base may also be a covered cylindrical shape extending in the axial direction and opening in the other axial direction Db, and is mounted on one axial end of the rotor 1. The plurality of moving blades 102 may also be arranged on the radially outer side surface of the impeller base and arranged in the circumferential direction.

[0044] The first circumferential wall portion 15 is a metal cylindrical member extending in the axial direction and surrounding the central axis CA. In the present embodiment, the first circumferential wall portion 15 is a cylindrical magnetic body extending in the axial direction. As described above, the rotor 1 has a first circumferential wall portion 15. The cylindrical first circumferential wall portion 15 extends from the other axial end surface of the rotor cover portion 13 to the other axial direction Db, surrounding the stator 2. However, this example is not limited thereto, and the first circumferential wall portion 15 may also extend from the radial inner side surface of the rotor barrel portion 14 to the other axial direction Db. That is, a portion of the first circumferential wall portion 15 on the side of one axial direction Da is connected to any one of the other axial end portion of the rotor cover portion 13 and the radial inner end portion of the rotor barrel portion 14. For example, a portion of the first circumferential wall portion 15 on the side of one axial direction Da is formed integrally with at least one of the rotor cover portion 13 and the rotor barrel portion 14 by insert molding or the like. Therefore, as Figure 1 and Figure 3 As shown, the portion on the axial side Da of the first circumferential wall portion 15 may be embedded in any part of the rotor cover portion 13 and the rotor tube portion 14. Alternatively, the portion on the axial side Da of the first circumferential wall portion 15 may be inserted into the cylindrical radial inner end portion of the rotor tube portion 14 and fixed to the cylindrical radial inner end portion of the rotor tube portion 14 by press-fitting, bonding, or the like.

[0045] The magnet 16 is arranged on the radially inner side of the first peripheral wall portion 15 and is radially opposed to the stator 2 (particularly the stator core 21 described later). As described above, the rotor 1 has the magnet 16. The magnet 16 is arranged radially outward Do from the stator 2 (particularly the stator core 21) and surrounds the stator 2 (particularly the stator core 21). In the magnet 16, a plurality of different magnetic poles (S pole, N pole) are alternately arranged in the circumferential direction.

[0046] Preferably, if Figure 4As shown, the axial length L1 of the portion of the first peripheral wall portion 15 exposed from any one of the rotor cover portion 13 and the rotor tube portion 14 is longer than the axial length L2 of the portion connected to the any one of the portions.

[0047] Thus, the axial length L1 of the exposed portion of the first peripheral wall portion 15 of the magnetic body can be made longer. Therefore, the first peripheral wall portion 15 can easily dissipate the heat transferred from the magnet 16. Therefore, the heat dissipation of the magnet 16 can be improved.

[0048] In addition, the axial width W (see Figure 4 ) is longer. Therefore, the third waterproof layer 63 described later can be arranged in the desired area in the axial direction of the third opposing surfaces fi3, fo3, so the layout freedom of the arrangement position of the third waterproof layer 63 becomes higher. Alternatively, the axial width W of the third waterproof layer 63 can be made wider. Therefore, the effect of suppressing or preventing water and dust from intruding into the interior of the motor 101 (especially the stator 2) can be further improved.

[0049] <1-2-2. Stator 2>

[0050] The stator 2 rotates the rotor 1 through the magnetic flux generated by the current. Figure 1 As shown, the stator 2 includes a stator core 21 , an insulator 22 , and a coil portion 23 .

[0051] The stator core 21 is an annular magnetic body surrounding the central axis CA, and in the present embodiment is a laminated body formed by axially overlapping plate-shaped electromagnetic steel plates extending radially. The stator core 21 is fixed to the radial outer side of the stator retainer 31. In addition, the stator core 21 has a slot (not shown). The slot passes through the stator core 21 in the axial direction, and a plurality of slots are arranged in the circumferential direction. The stator core 21 is provided with a plurality of coil portions 23 arranged in the circumferential direction. As described above, the stator 2 has a stator core 21.

[0052] The insulator 22 has electrical insulating properties and is disposed on the surface of the stator core 21 (particularly, both end surfaces in the axial direction and the inner side surfaces of the slots, etc.).

[0053] The coil portion 23 is a component in which a conductive wire (not shown) is arranged in a coil shape on the stator core 21 via an insulator 22. The conductive wire is, for example, an enameled copper wire or a metal wire covered with an electrical insulating member, and is wound around teeth (not shown) between slots adjacent in the circumferential direction in the stator core 21 to form the coil portion 23. When a drive current is supplied to each coil portion 23, the stator 2 is excited and the rotor 1 is driven.

[0054] <1-2-3. Housing 3>

[0055] The housing 3 includes a stator holder 31 , a base portion 32 , and a second peripheral wall portion 33 .

[0056] The stator holder 31 is a metal cylindrical member extending in the axial direction and surrounding the central axis CA. The stator holder 31 extends in the axial direction and supports the stator core 21. As described above, the housing 3 has the stator holder 31. In other words, the motor 101 has the stator holder 31. The stator holder 31 is a cylindrical member surrounding the central axis CA and extending in the axial direction, and holds the stator core 21 on its radial outer side.

[0057] In addition, one axial end portion of the stator holder 31 is arranged radially outward Do from the protruding wall portion 12 of the rotor 1. The protruding wall portion 12 (particularly the portion on the other axial side Db) is inserted into the interior (radially inner side) of one axial end portion of the stator holder 31, and is radially opposed to the one axial end portion of the stator holder 31 with a gap therebetween.

[0058] In addition, a bearing 311 is disposed on the cylindrical inner peripheral surface (that is, the radially inner surface) of the stator holder 31 , and the shaft 10 is inserted therethrough. The stator holder 31 rotatably supports the shaft 10 via the bearing 311 .

[0059] In addition, the bearing 311 is arranged on the inner circumferential surface (i.e., the radial inner side) of the stator retainer 31. The motor 101 is provided with a bearing 311. The bearing 311 is a metal cylindrical component that extends in the axial direction and surrounds the shaft 10, and in the present embodiment is a sleeve that functions as a fluid dynamic pressure bearing. A fluid such as lubricating oil is arranged between the shaft 10 and the bearing 311 (not shown in the figure). A dynamic pressure groove (not shown in the figure) for generating dynamic pressure in the fluid between the two is arranged on at least one of the radial outer side surface of the shaft 10 and the radial inner side surface of the bearing 311. When the shaft 10 rotates, dynamic pressure is generated in the fluid between the two through the dynamic pressure groove. The bearing 311 and the shaft 10 are separated by this dynamic pressure. As a result, the rotating shaft 10 is supported in a non-contact state with the bearing 311.

[0060] One axial end of the bearing 311 is notched in an annular shape at the radial outer end. In other words, the bearing 311 has a recess 312. The recess 312 is cylindrical and surrounds the central axis CA, and extends in the axial direction. Figure 3 As shown, the recess 312 is recessed toward the other axial direction Db at one axial end of the bearing 311, and is open toward the radially outward direction Do. The other axial end surface of the recess 312 (i.e., the inner surface facing the one axial direction Da) is arranged closer to the other axial direction Db than the protruding wall portion 12, and is axially opposed to the other axial end surface of the protruding wall portion 12 with a gap therebetween.

[0061] The radially inner side surface of the recess 312 (ie, the inner surface facing radially outward Do) is arranged radially inward Di of the protruding wall portion 12 of the rotor 1 and radially faces the radially inner side surface of the protruding wall portion 12 with a gap therebetween.

[0062] In addition, the bearing 311 also has a front end portion 313. The front end portion 313 is a portion on the radially inner Di side of the recess 312 in one axial end portion of the bearing 311 (i.e., a portion that is not cut). The front end portion 313 is a metal cylindrical component that extends in the axial direction and surrounds the shaft 10. The front end portion 313 is arranged closer to the radial inner Di than the protruding wall portion 12 of the rotor 1, and is radially opposite to the protruding wall portion 12 with a gap therebetween. In addition, the radially outer side surface of the front end portion 313 can also be referred to as the radially inner side surface of the recess 312 (i.e., the inner surface facing the radially outer Do). In addition, in the present embodiment, the front end portion 313 is a part of the bearing 311. However, it is not limited to this example, and the front end portion 313 can also be a component different from the bearing 311, and can be arranged on the radially inner Di side of one axial end surface of the bearing 311.

[0063] In addition, without being limited to the example of the present embodiment, one axial end portion of the stator holder 31 may be arranged radially inward Di of the protruding wall portion 12 of the rotor 1. That is, one axial end portion of the stator holder 31 may be inserted into the interior (radially inward) of the protruding wall portion 12 (particularly the portion on the other axial direction Db side) and surrounded by the protruding wall portion 12.

[0064] Next, the base portion 32 is disposed at the other axial direction Db relative to the stator 2, and extends from the stator holder 31 toward the radially outward direction Do. As described above, the housing 3 includes the base portion 32.

[0065] The second circumferential wall portion 33 is a metal cylindrical member extending in the axial direction and surrounds the central axis CA. The second circumferential wall portion 33 extends from one axial end surface of the base portion 32 along one axial direction Da and surrounds the stator 2. As described above, the housing 3 has the second circumferential wall portion 33. For example, the portion of the second circumferential wall portion 33 on the other axial direction Db side is at least integrally formed with the base portion 32 by insert molding or the like. Alternatively, the portion of the second circumferential wall portion 33 on the other axial direction Db side may also be inserted into an annular recessed portion disposed on one axial end surface of the base portion 32 and fixed to the base portion 32 by methods such as press-fitting and bonding.

[0066] The second peripheral wall portion 33 is arranged radially outward Do from the first peripheral wall portion 15. The first peripheral wall portion 15 (particularly the portion on the other axial direction Db side) is inserted into the second peripheral wall portion 33 (radially inside) and radially faces the second peripheral wall portion 33 with a gap therebetween.

[0067] In addition, the second circumferential wall portion 33 is not limited to the example of the present embodiment, and the second circumferential wall portion 33 may be arranged radially inward Di than the first circumferential wall portion 15 as long as it does not contact the magnet 16 and the stator 2. That is, the second circumferential wall portion 33 may be inserted into the interior (radially inward) of the first circumferential wall portion 15 (particularly the portion on the other axial direction Db side) and surrounded by the first circumferential wall portion 15.

[0068] <1-2-4. Circuit board 4>

[0069] A circuit board 4 is arranged on the other axial side Db of the base portion 32, radially outward Do from the stator holder 31. The circuit board 4 is electrically connected to the lead wire (symbol omitted) led out from the coil portion 23. The drive circuit of the stator 2 and the like are mounted on the circuit board 4. In addition, the circuit board 4 is electrically connected to the external wiring 41, and is covered by a resin cover 42 together with the connection end of the external wiring 41. The external wiring 41 is led out to the outside of the motor 101, and the circuit board 4 is electrically connected to an external device, a power source, and the like.

[0070] <1-2-5. Labyrinth Section 5>

[0071] The labyrinth 5 suppresses or prevents the penetration of water and dust inside and outside the labyrinth 5. The labyrinth 5 has a pair of metal cylindrical parts surrounding the central axis CA. The pair of metal cylindrical parts has a pair of opposing surfaces fi, fo in which one surrounds the other. The pair of opposing surfaces fi, fo are opposed to each other with a gap in the radial direction.

[0072] Thus, compared with the case where a pair of tubular members are made of resin, for example, the dimensional accuracy of the metal tubular member is good, so the dimensional tolerance can be further reduced. Therefore, the gap between the pair of opposing surfaces fi and fo can be ensured while the gap can be further reduced. Therefore, it is possible to suppress or prevent water and dust from intruding from the radially outer Do side of the labyrinth portion 5 to the radially inner Di side.

[0073] The labyrinth section 5 includes a first labyrinth section 51 , a second labyrinth section 52 , and a third labyrinth section 53 .

[0074] <1-2-5-1. First labyrinth section 51>

[0075] like Figure 3 As shown, the first labyrinth 51 is formed in a gap between the protruding wall 12 (particularly the portion on the other axial side Db) and one axial end of the stator holder 31. One of a pair of metal cylindrical members included in the first labyrinth 51 is the protruding wall 12, and the other is the stator holder 31. As described above, the labyrinth 5 includes the first labyrinth 51. The first labyrinth 51 includes a pair of first opposing surfaces fi1, fo1.

[0076] In the present embodiment, a pair of first opposing surfaces fi1, fo1 is constituted by the radial outer side surface of the protruding wall portion 12 and the radial inner side surface of one axial end portion of the stator holder 31 which is radially opposed to the radial outer side surface with a gap therebetween. Specifically, a region of the radial outer side surface of the protruding wall portion 12 which overlaps with the radial inner side surface of one axial end portion of the stator holder 31 when viewed in the radial direction is referred to as the "first opposing surface fi1". In addition, a region of the radial inner side surface of one axial end portion of the stator holder 31 which overlaps with the radial outer side surface of the protruding wall portion 12 when viewed in the radial direction is referred to as the "first opposing surface fo1". That is, a pair of first opposing surfaces fi1, fo1 is constituted by the first opposing surface fi1 of the protruding wall portion 12 and the first opposing surface fo1 of the stator holder 31.

[0077] In addition, not limited to the example of the present embodiment, one axial end of the stator holder 31 may be arranged at a radially inner side Di than the protruding wall portion 12 of the rotor 1. That is, one axial end of the stator holder 31 may be inserted into the interior (radially inner side) of the protruding wall portion 12 (especially the portion on the other axial side Db). However, in this case, the second labyrinth portion 52 and the second opposing surfaces fi2, fo2 described later are not arranged. That is, the labyrinth portion 5 does not include the second labyrinth portion 52. In addition, a pair of opposing surfaces fi, fo does not include a pair of second opposing surfaces fi2, fo2. In addition, in this case, the first opposing surface fi1 is the radially outer side surface of one axial end of the stator holder 31, and more specifically, is the area of ​​the radially outer side surface of one axial end of the stator holder 31 that overlaps with the radially inner side surface of the protruding wall portion 12 when viewed radially. The first facing surface fo1 is a radially inner side surface of the protruding wall portion 12 , and more specifically, is a region of the radially inner side surface of the protruding wall portion 12 that overlaps with a radially outer side surface of one axial end portion of the stator holder 31 when viewed in the radial direction.

[0078] That is, the cylindrical portion of one of the protruding wall portion 12 and the stator holder 31 only needs to surround the cylindrical portion of the other. In this case, a pair of first opposing surfaces fi1, fo1 is composed of the radial inner side surface of the cylindrical portion of one and the radial outer side surface of the cylindrical portion of the other. In addition, the radial inner side surface of the cylindrical portion of one and the radial outer side surface of the cylindrical portion of the other are radially opposed with a gap therebetween.

[0079] <1-2-5-2. Second labyrinth section 52>

[0080] The second labyrinth 52 is formed in a gap between the radially inner side surface of the recess 312 (i.e., the inner surface facing the radially outer direction Do) and the radially inner side surface of the protruding wall 12. One of a pair of metal cylindrical parts included in the second labyrinth 52 is the protruding wall 12, and the other is the stator holder 31. As described above, the labyrinth 5 includes the second labyrinth 52. The second labyrinth 52 includes a pair of second opposing surfaces fi2, fo2.

[0081] A pair of second opposing surfaces fi2, fo2 is composed of the radial inner side surface of the recessed portion 312 and the radial inner side surface of the protruding wall portion 12 which is radially opposed to the radial inner side surface with a gap therebetween. In detail, the area of ​​the radial inner side surface of the recessed portion 312 which overlaps with the radial inner side surface of the protruding wall portion 12 when viewed from the radial direction is referred to as the "second opposing surface fi2". In addition, the area of ​​the radial inner side surface of the protruding wall portion 12 which overlaps with the radial inner side surface of the recessed portion 312 when viewed from the radial direction is referred to as the "second opposing surface fo2". That is, a pair of second opposing surfaces fi2, fo2 is composed of the second opposing surface fi2 of the recessed portion 312 and the second opposing surface fo2 of the protruding wall portion 12.

[0082] <1-2-5-3. Third labyrinth section 53>

[0083] like Figure 4 As shown, the third labyrinth 53 is formed in the gap between the first peripheral wall portion 15 (particularly the portion on the other axial side Db) and the second peripheral wall portion 33. One of a pair of metal cylindrical members included in the third labyrinth 53 is the first peripheral wall portion 15, and the other is the second peripheral wall portion 33. As described above, the labyrinth 5 includes the third labyrinth 53. The third labyrinth 53 includes a pair of third opposing surfaces fi3, fo3.

[0084] In the present embodiment, a pair of third opposing surfaces fi3, fo3 is formed by the radial outer side surface of the first peripheral wall portion 15 and the radial inner side surface of the second peripheral wall portion 33. In detail, the area of ​​the radial outer side surface of the first peripheral wall portion 15 that overlaps with the radial inner side surface of the second peripheral wall portion 33 when viewed from the radial direction is referred to as the "third opposing surface fi3". In addition, the area of ​​the radial inner side surface of the second peripheral wall portion 33 that overlaps with the radial outer side surface of the first peripheral wall portion 15 when viewed from the radial direction is referred to as the "third opposing surface fo3". That is, a pair of third opposing surfaces fi3, fo3 is formed by the third opposing surface fi3 of the first peripheral wall portion 15 and the third opposing surface fo3 of the second peripheral wall portion 33.

[0085] In addition, it is not limited to the example of the present embodiment. As long as the second circumferential wall portion 33 does not contact the magnet 16 and the stator 2, it can also be arranged at the radial inner side Di than the first circumferential wall portion 15. That is, the second circumferential wall portion 33 can also be inserted into the interior (radially inner side) of the first circumferential wall portion 15 (especially the portion on the other axial side Db). In this case, the third opposing surface fi3 is the radial outer side surface of the second circumferential wall portion 33, and more specifically, it is the area of ​​the radial outer side surface of the second circumferential wall portion 33 that overlaps with the radial inner side surface of the first circumferential wall portion 15 when viewed radially. In addition, the third opposing surface fo3 is the radial inner side surface of the first circumferential wall portion 15, and more specifically, it is the area of ​​the radial inner side surface of the first circumferential wall portion 15 that overlaps with the radial outer side surface of the second circumferential wall portion 33 when viewed radially.

[0086] That is, one of the first circumferential wall portion 15 and the second circumferential wall portion 33 only needs to surround the other circumferential wall portion. In this case, a pair of third opposing surfaces fi3, fo3 is composed of the radial inner side surface of one circumferential wall portion and the radial outer side surface of the other circumferential wall portion. In addition, the radial inner side surface of one circumferential wall portion and the radial outer side surface of the other circumferential wall portion are radially opposed with a gap therebetween.

[0087] Preferably, the axial width W of a pair of third opposing surfaces fi3, fo3 (see Figure 4 ) is greater than the axial length L3 of the protruding wall portion 12 (refer to Figure 3 ) length. In addition, in detail, the axial width W is the axial width of the area of ​​the radial outer side surface of the first circumferential wall portion 15 that overlaps with the radial inner side surface of the second circumferential wall portion 33 when viewed from the radial direction. In other words, the axial width W is the axial width of the area of ​​the radial inner side surface of the second circumferential wall portion 33 that overlaps with the radial outer side surface of the first circumferential wall portion 15 when viewed from the radial direction. In this way, the axial width W of a pair of third opposing surfaces fi3, fo3 can be expanded. Therefore, the effect of suppressing or preventing water and dust from intruding into the interior of the motor 101 (especially the stator 2) can be improved.

[0088] <1-2-5-4. Radial width of labyrinth section 5>

[0089] Next, the radial width of the gap between the pair of opposing surfaces fi, fo is preferably less than the radial width of at least one of the pair of metal tubular members of the labyrinth 5, and more preferably less than the radial width of both of the pair of metal tubular members. By making the radial width of the gap between the pair of opposing surfaces fi, fo small, it is possible to more effectively suppress or prevent water and dust from passing through the labyrinth 5.

[0090] For example, Figure 3 As shown, in the first labyrinth 51, the radial width Wr1 of the gap between the pair of first opposing surfaces fi1, fo1 is preferably less than at least one of the radial width d1 of the protruding wall 12 and the radial width d2 of one axial end of the stator holder 31, and more preferably less than both radial widths d1 and d2. By making the radial width Wr1 of the gap between the pair of first opposing surfaces fi1, fo1 small, it is possible to more effectively suppress or prevent water and dust from passing through the first labyrinth 51.

[0091] In addition, if Figure 3As shown, in the second labyrinth 52, the radial width Wr2 of the gap between the pair of second opposing surfaces fi2, fo2 is preferably less than at least one of the radial width d1 of the protruding wall portion 12 and the radial width d3 of one axial end portion (i.e., the front end portion 313) of the bearing 311, and more preferably less than the radial widths d1 and d3 of both. By making the radial width Wr2 of the gap between the pair of second opposing surfaces fi2, fo2 small, water and dust can be more effectively suppressed or prevented from passing through the second labyrinth 52.

[0092] In addition, if Figure 4 As shown, in the third labyrinth 53, the radial width Wr3 of the gap between the pair of third opposing surfaces fi3, fo3 is preferably less than at least one of the radial width d4 of the first peripheral wall portion 15 and the radial width d5 ​​of the second peripheral wall portion 33, and more preferably less than the radial widths d4 and d5 of both. By making the radial width Wr3 of the gap between the pair of third opposing surfaces fi3, fo3 small, it is possible to more effectively suppress or prevent water and dust from passing through the third labyrinth 53.

[0093] <1-2-6. Waterproof layer 6>

[0094] Next, refer to Figure 1 and Figure 3 to Figure 4 , explaining the waterproof layer 6. The waterproof layer 6 is a waterproof coating, which is in the shape of a tube extending in the axial direction. In the present embodiment, the waterproof layer 6 is a coating film of a hydrophobic agent. In this way, the waterproof layer 6 can be formed by a simple method. However, the material and configuration method of the waterproof layer 6 are not limited to this example. The material of the waterproof layer 6 only needs to be waterproof, for example, it can also be fluorine resin or oil, silicone resin or oil, waterproof ceramics, etc. In addition, the configuration method of the waterproof layer 6 can also be spraying, dipping, physical vapor deposition, chemical vapor deposition, etc.

[0095] The waterproof layer 6 is disposed on at least one of the pair of facing surfaces fi, fo. As described above, the motor 101 includes the waterproof layer 6. By disposing the waterproof layer 6 that repels water, it is possible to suppress or prevent water from passing through the gap between the pair of facing surfaces fi, fo.

[0096] In the opposing surface fi, the tubular waterproof layer 6 can be arranged in any partial area in the axial direction, and can also be arranged in the entire area of ​​the opposing surface fi. Similarly, in the opposing surface fo, the tubular waterproof layer 6 can be arranged in a partial area in the axial direction, and can be arranged in the entire area in the axial direction.

[0097] Preferably, as in the present embodiment, the waterproof layer 6 is arranged on both sides of a pair of opposing surfaces fi and fo. In this case, the axial width of the waterproof layer 6 arranged on the opposing surface fi may be the same as the axial width of the waterproof layer 6 arranged on the opposing surface fo, or may be smaller or larger than the axial width of the waterproof layer 6 arranged on the opposing surface fo. In addition, when viewed from the radial direction, at least a portion of the waterproof layer 6 arranged on the opposing surface fi may overlap with at least a portion of the waterproof layer 6 arranged on the opposing surface fo, or may not overlap. That is, in the latter, the arrangement of the waterproof layer 6 arranged on the opposing surface fi may also be staggered in the axial direction with the arrangement of the waterproof layer 6 arranged on the opposing surface fo.

[0098] The waterproof layer 6 includes a first waterproof layer 61 , a second waterproof layer 62 and a third waterproof layer 63 .

[0099] <1-2-6-1. First waterproof layer 61>

[0100] The first waterproof layer 61 is a waterproof coating in the shape of a tube extending in the axial direction. In the first labyrinth portion 51, the first waterproof layer 61 is arranged on at least one of a pair of first opposing surfaces fi1, fo1. As described above, the waterproof layer 6 includes the first waterproof layer 61. The first waterproof layer 61 can more effectively suppress or prevent water from intruding into the shaft 10, the bearing 311, and the space between the two. The pair of first opposing surfaces fi1, fo1 are respectively the outer surfaces of one axial end of the protruding wall portion 12 and the stator retainer 31, and therefore, the first waterproof layer 61 can be easily arranged before the motor 101 is assembled.

[0101] In the first opposing surface fi1, the cylindrical first waterproof layer 61 can be as follows Figure 3 Similarly, in the first opposing surface fo1, the cylindrical first waterproof layer 61 can be arranged in any partial area in the axial direction, or in the entire area in the axial direction. In addition, the cylindrical first waterproof layer 61 can also be arranged on the radial side surface ( Figure 3 The area other than the first facing surface fi1 in the axial direction of the stator holder 31 may also be arranged on the radial side surface ( Figure 3 The area other than the first opposing surface fo1 in the radially inner surface).

[0102] Preferably, if Figure 3As shown, the first waterproof layer 61 is arranged on both sides of a pair of first opposing surfaces fi1, fo1. In this case, the axial width of the first waterproof layer 61 arranged on the first opposing surface fi1 may be the same as the axial width of the first waterproof layer 61 arranged on the first opposing surface fo1, or may be smaller or larger than the axial width of the first waterproof layer 61 arranged on the first opposing surface fo1. In addition, when viewed from the radial direction, at least a portion of the first waterproof layer 61 arranged on the first opposing surface fi1 may overlap or may not overlap with at least a portion of the first waterproof layer 61 arranged on the first opposing surface fo1. That is, in the latter, the configuration of the first waterproof layer 61 on the first opposing surface fi1 may also be axially offset from the configuration of the first waterproof layer 61 on the first opposing surface fo1. However, this example does not exclude a structure in which the first waterproof layer 61 is not arranged on at least one of the pair of first opposing surfaces fi1, fo1.

[0103] <1-2-6-2. Second waterproof layer 62>

[0104] The second waterproof layer 62 is a waterproof coating in the shape of a tube extending in the axial direction. In the second labyrinth portion 52, the second waterproof layer 62 is arranged on at least one of a pair of second opposing surfaces fi2, fo2. As described above, the waterproof layer 6 includes the second waterproof layer 62. The second waterproof layer 62 can more effectively suppress or prevent water from entering between the shaft 10 and the bearing 311 and the shaft 10. The pair of second opposing surfaces fi2, fo2 are the outer surfaces of the bearing 311 and the protruding wall portion 12, respectively, so the second waterproof layer 62 can be easily arranged before the motor 101 is assembled.

[0105] In the second opposing surface fi2, the cylindrical second waterproof layer 62 can be as Figure 3 The second waterproof layer 62 may be arranged in any partial area in the axial direction as shown, or in the entire area in the axial direction. Similarly, on the second opposing surface fo2, the second tubular waterproof layer 62 may be arranged in any partial area in the axial direction, or in the entire area in the axial direction. In addition, the second tubular waterproof layer 62 may be arranged in an area other than the second opposing surface fi2 in the radial inner side surface of the recess 312 of the bearing 311 (i.e., the radial outer side surface of the front end portion 313), or in an area other than the second opposing surface fo2 in the radial inner side surface of the protruding wall portion 12.

[0106] Preferably, if Figure 3As shown, the second waterproof layer 62 is arranged on both sides of a pair of second opposing surfaces fi2 and fo2. In this case, the axial width of the second waterproof layer 62 arranged on the second opposing surface fi2 may be the same as the axial width of the second waterproof layer 62 arranged on the second opposing surface fo2, or may be smaller or larger than the axial width of the second waterproof layer 62 arranged on the second opposing surface fo2. In addition, when viewed from the radial direction, at least a portion of the second waterproof layer 62 arranged on the second opposing surface fi2 may overlap or may not overlap with at least a portion of the second waterproof layer 62 arranged on the second opposing surface fo2. That is, in the latter, the configuration of the second waterproof layer 62 on the second opposing surface fi2 may also be axially offset from the configuration of the second waterproof layer 62 on the second opposing surface fo2. However, this example does not exclude a structure in which the second waterproof layer 62 is not arranged on at least one of a pair of second opposing surfaces fi2 and fo2.

[0107] <1-2-6-3. Third waterproof layer 63>

[0108] The third waterproof layer 63 is a waterproof coating in the shape of a tube extending in the axial direction. In the third labyrinth portion 53, the third waterproof layer 63 is arranged on at least one of a pair of third opposing surfaces fi3, fo3. As described above, the waterproof layer 6 includes the third waterproof layer 63. The third waterproof layer 63 can more effectively suppress or prevent water from entering the interior of the motor 101 (especially the stator 2). In addition, by forming the third waterproof layer 63 on at least one of the third opposing surfaces fi3, fo3 before assembling the motor 101, the third waterproof layer 63 can be easily arranged.

[0109] In the third opposing surface fi3, the cylindrical third waterproof layer 63 can be as follows Figure 4 Similarly, in the third opposing surface fo3, the cylindrical third waterproof layer 63 can be arranged in any partial area in the axial direction, or in the entire area in the axial direction. In addition, the cylindrical third waterproof layer 63 can also be arranged on the radial side surface ( Figure 4 The area other than the third opposing surface fi3 in the radial outer side surface (in the middle) can also be arranged on the radial side surface ( Figure 4 The area outside the third opposing surface fo3 in the radial inner surface).

[0110] Preferably, if Figure 4As shown, the third waterproof layer 63 is arranged on both sides of a pair of third opposing surfaces fi3 and fo3. In this case, the axial width of the third waterproof layer 63 arranged on the third opposing surface fi3 may be the same as the axial width of the third waterproof layer 63 arranged on the third opposing surface fo3, or may be smaller or larger than the axial width of the third waterproof layer 63 arranged on the third opposing surface fo3. In addition, when viewed from the radial direction, at least a portion of the third waterproof layer 63 arranged on the third opposing surface fi3 may overlap with at least a portion of the third waterproof layer 63 arranged on the third opposing surface fo3, or may not overlap. That is, in the latter, the configuration of the third waterproof layer 63 on the third opposing surface fi3 may also be axially offset from the configuration of the third waterproof layer 63 on the third opposing surface fo3. However, this example does not exclude a structure in which the third waterproof layer 63 is not arranged on at least one of a pair of third opposing surfaces fi3 and fo3.

[0111] <1-2-7. Other maze sections>

[0112] Then, if Figure 1 and Figure 5 As shown, the motor 101 further includes an outer labyrinth 54 and an outer waterproof layer 64. Figure 5 It is magnified Figure 1 sectional view of portion V surrounded by a dotted line.

[0113] <1-2-7-1. Outer labyrinth section 54>

[0114] The outer labyrinth 54 is formed between the second circumferential wall 33 and the rotor tube 14. The outer labyrinth 54 has a pair of cylindrical parts surrounding the central axis CA. One of the pair of cylindrical parts is the metal second circumferential wall 33, and the other is the resin rotor tube 14. The pair of cylindrical parts has a pair of outer facing surfaces foa and fob, one of which surrounds the other. The pair of outer facing surfaces foa and fob are radially opposed with a gap. The outer labyrinth 54 includes a pair of outer facing surfaces foa and fob. In the present embodiment, a pair of outer facing surfaces foa and fob are composed of the radial outer side surface of the second circumferential wall 33 and the radial inner side surface of the rotor tube 14. In detail, the area of ​​the radial outer side surface of the second circumferential wall 33 that overlaps with the radial inner side surface of the rotor tube 14 when viewed in the radial direction is referred to as the "outer facing surface foa". In addition, the area of ​​the radial inner side surface of the second circumferential wall 33 that overlaps with the radial inner side surface of the rotor tube 14 when viewed in the radial direction is referred to as the "outer facing surface fob". That is, the pair of outer facing surfaces foa and fob are constituted by the outer facing surface foa of the second peripheral wall portion 33 and the outer facing surface fob of the rotor tube portion 14 .

[0115] like Figure 5As shown, the minimum radial width Wr4 of the gap between the pair of outer facing surfaces foa, fob is preferably less than at least one of the radial width d5 ​​of the second peripheral wall portion 33 and the thickness d6 of the rotor tube portion 14, and more preferably less than both widths d5 and d6. In addition, the thickness d6 of the rotor tube portion 14 is the width in the direction perpendicular to the direction in which the rotor tube portion 14 extends when viewed from the circumferential direction. In this way, the radial width Wr4 between the pair of outer facing surfaces foa, fob can be made narrower, so that water and dust can be more effectively suppressed or prevented from passing through the outer labyrinth portion 54.

[0116] <1-2-7-2. Outer waterproof layer 64>

[0117] The outer waterproof layer 64 is a waterproof coating, which is cylindrical and extends in the axial direction. In the present embodiment, the outer waterproof layer 64 is a coating film of a hydrophobic agent. In this way, the outer waterproof layer 64 can be formed by a simple method. However, the material and configuration method of the outer waterproof layer 64 are not limited to this example. The material of the outer waterproof layer 64 can be any material as long as it is waterproof, for example, it can be a fluorine-based resin or oil, a silicone resin or oil, a waterproof ceramic, etc. In addition, the configuration method of the outer waterproof layer 64 can also be spraying, dipping, physical vapor deposition, chemical vapor deposition, etc.

[0118] In the outer labyrinth portion 54, the outer waterproof layer 64 is disposed on at least one of a pair of outer opposing surfaces foa and fob. Figure 5 As shown, the outer waterproof layer 64 is arranged on the outer facing surface foa of the second peripheral wall portion 33, but is preferably arranged on both of the pair of outer facing surfaces foa and fob. The outer waterproof layer 64 can more effectively suppress the intrusion of water from the outside to the inside of the motor 101. In addition, the pair of outer facing surfaces foa and fob are the outer surfaces of the second peripheral wall portion 33 and the rotor cylinder portion 14, respectively, so the outer waterproof layer 64 can be easily arranged before assembling the motor 101.

[0119] In the outer facing surface foa, the cylindrical outer waterproof layer 64 can be as Figure 5 The outer waterproof layer 64 may be arranged in any partial area in the axial direction as shown, or in the entire area in the axial direction. Similarly, in the outer facing surface fob, the cylindrical outer waterproof layer 64 may be arranged in any partial area in the axial direction, or in the entire area in the axial direction. In addition, the cylindrical outer waterproof layer 64 may be arranged in an area other than the outer facing surface foa in the radial outer side surface of the second peripheral wall portion 33, or in an area other than the outer facing surface fob in the radial inner side surface of the rotor cylinder portion 14.

[0120] In addition, when the outer waterproof layer 64 is arranged on both sides of a pair of outer opposing surfaces foa and fob, the axial width of the outer waterproof layer 64 arranged on the outer opposing surface foa may be the same as the axial width of the outer waterproof layer 64 arranged on the outer opposing surface fob, or may be smaller or larger than the axial width of the outer waterproof layer 64 arranged on the outer opposing surface fob. In addition, when viewed from the radial direction, at least a portion of the outer waterproof layer 64 arranged on the outer opposing surface foa may overlap with at least a portion of the outer waterproof layer 64 arranged on the outer opposing surface fob, or may not overlap. That is, in the latter case, the arrangement of the outer waterproof layer 64 on the outer opposing surface foa may also be staggered in the axial direction from the arrangement of the outer waterproof layer 64 on the outer opposing surface fob.

[0121] However, the above example does not exclude a structure in which the outer waterproof layer 64 is not disposed on both of the pair of outer facing surfaces foa and fob. For example, the outer waterproof layer 64 may be omitted.

[0122] <2. Others>

[0123] The above describes the embodiments of the present invention. In addition, the scope of the present invention is not limited to the above embodiments. The present invention can be implemented by applying various changes to the above embodiments without departing from the gist of the invention. In addition, the matters described in the above embodiments can be appropriately combined in any manner without causing contradictions.

[0124] <3. Conclusion>

[0125] The embodiments described so far will be summarized below.

[0126] For example, the structure of the motor disclosed in this specification is as follows.

[0127] Solution 1 has:

[0128] A rotor rotatable about a central axis extending in the axial direction;

[0129] a stator having a stator core provided with a plurality of coil portions arranged in a circumferential direction; and

[0130] The labyrinth has a pair of metal cylindrical members surrounding the central axis.

[0131] The pair of metal cylindrical members has a pair of opposing surfaces which face each other in the radial direction with a gap therebetween and one of the surfaces surrounds the other.

[0132] Solution 2: The motor according to Solution 1 may also be:

[0133] The radial width of the gap between the pair of facing surfaces is equal to or smaller than the radial width of at least one of the pair of metal cylindrical members.

[0134] Scheme 3: The motor according to scheme 1 or 2 may also be:

[0135] The invention further comprises a waterproof layer disposed on at least one of the pair of opposing surfaces.

[0136] Scheme 4: The motor according to Scheme 3 may also be:

[0137] A stator holder is also provided, the stator holder is in a cylindrical shape extending in the axial direction and surrounding the central axis, and supports the stator core.

[0138] The rotor has:

[0139] A shaft extending along the central axis and rotatable about the central axis;

[0140] a rotor hub extending radially outward from one axial end of the shaft; and

[0141] a cylindrical protruding wall portion extending from the other axial end surface of the rotor hub toward the other axial direction and surrounding the one axial end portion of the bearing;

[0142] The cylindrical portion of one of the protruding wall portion and the stator holder surrounds the cylindrical portion of the other.

[0143] The labyrinth portion includes a first labyrinth portion including a pair of first opposing surfaces.

[0144] The pair of opposing surfaces includes a pair of first opposing surfaces.

[0145] The pair of first opposing surfaces is composed of a radially inner side surface of the one cylindrical portion and a radially outer side surface of the other cylindrical portion.

[0146] The radially inner side surface of the one cylindrical portion and the radially outer side surface of the other cylindrical portion are radially opposed to each other with a gap therebetween.

[0147] The waterproof layer includes a first waterproof layer disposed on at least one of the pair of first opposing surfaces.

[0148] Scheme 5: The motor according to scheme 3 or 4 may also be:

[0149] Also available:

[0150] a stator holder which is cylindrical and extends in the axial direction and surrounds the central axis, and supports the stator core; and

[0151] A bearing is arranged on the inner peripheral surface of the stator retainer.

[0152] The bearing has a cylindrical recessed portion surrounding the central axis.

[0153] The recessed portion is recessed in one axial direction of the bearing toward the other axial direction and is open toward the radially outward direction.

[0154] The rotor has:

[0155] a shaft extending along the central axis and rotatably supported by the bearing;

[0156] a rotor hub extending radially outward from one axial end of the shaft; and

[0157] a cylindrical protruding wall portion extending from the other axial end surface of the rotor hub toward the other axial direction and surrounding the one axial end portion of the bearing;

[0158] The labyrinth portion includes a second labyrinth portion including a pair of second opposing surfaces.

[0159] The pair of opposing surfaces includes a pair of second opposing surfaces.

[0160] The pair of second opposing surfaces is composed of a radially inner side surface of the recessed portion and a radially inner side surface of the protruding wall portion which is radially opposed to the radially inner side surface with a gap therebetween.

[0161] The waterproof layer includes a second waterproof layer disposed on at least one of the pair of second opposing surfaces.

[0162] Scheme 6: The motor according to any one of schemes 3 to 5 may also be:

[0163] A housing is also provided, the housing having a stator holder extending in the axial direction and supporting the stator core.

[0164] The rotor has:

[0165] a rotor cover portion, which is arranged axially closer to the stator and extends in the radial direction; and

[0166] A cylindrical first peripheral wall portion extends from the other axial end surface of the rotor cover portion in the other axial direction and surrounds the stator.

[0167] The housing also has:

[0168] a base portion disposed on the other side of the stator in the axial direction and extending radially outward from the stator holder; and

[0169] A second peripheral wall portion extends from one axial end surface of the base portion in one axial direction and surrounds the stator.

[0170] One of the first peripheral wall portion and the second peripheral wall portion surrounds the other peripheral wall portion.

[0171] The labyrinth section includes a third labyrinth section including a pair of third opposing surfaces.

[0172] The pair of the opposing surfaces includes a pair of the third opposing surfaces.

[0173] The pair of the third opposing surfaces is composed of a radially inner side surface of the one peripheral wall portion and a radially outer side surface of the other peripheral wall portion.

[0174] The radially inner side surface of the one peripheral wall portion and the radially outer side surface of the other peripheral wall portion are radially opposed to each other with a gap therebetween.

[0175] The waterproof layer includes a third waterproof layer disposed on at least one of the pair of third opposing surfaces.

[0176] Scheme 7: The motor according to Scheme 6 may also be:

[0177] A bearing is also provided on the inner peripheral surface of the stator holder.

[0178] The rotor has:

[0179] a shaft extending along the central axis and rotatably supported by the bearing;

[0180] a rotor hub extending radially outward from one axial end of the shaft; and

[0181] a cylindrical protruding wall portion extending from the other axial end surface of the rotor hub toward the other axial direction and surrounding the one axial end portion of the bearing;

[0182] An axial width of the pair of third opposing surfaces is greater than an axial length of the protruding wall portion.

[0183] Scheme 8: The motor according to scheme 6 or 7 may also be:

[0184] The rotor also has:

[0185] a rotor cylinder portion extending axially in the other direction from the radially outer end portion of the rotor cover portion; and

[0186] a magnet disposed on the radially inner side of the first peripheral wall portion and radially opposed to the stator core;

[0187] The first peripheral wall portion is a cylindrical magnetic body extending in the axial direction.

[0188] A portion of the first peripheral wall portion on one axial side is connected to any one of the other axial end portion of the rotor cover portion and the radial inner end portion of the rotor tube portion.

[0189] The axial length of a portion of the first peripheral wall portion exposed from the any one of the locations is longer than the axial length of a portion connected to the any one of the locations.

[0190] Scheme 9: The motor according to any one of schemes 3 to 8 may also be:

[0191] The waterproof layer is a coating film of a hydrophobic agent.

[0192] In addition, scheme 10 is an air supply device, which comprises:

[0193] A motor according to any one of schemes 1 to 9; and

[0194] The moving blade is rotatable together with the rotor of the motor about the central axis.

[0195] Availability in production

[0196] The present invention is applicable to a technology for suppressing the intrusion of water and dust into the interior of a motor.

Claims

1. A motor, characterized in that: have: A rotor rotatable about a central axis extending in the axial direction; a stator having a stator core provided with a plurality of coil portions arranged in a circumferential direction; and The labyrinth has a pair of metal cylindrical members surrounding the central axis. The pair of metal cylindrical members has a pair of opposing surfaces which face each other in the radial direction with a gap therebetween and one of the surfaces surrounds the other.

2. The motor according to claim 1, characterized in that The radial width of the gap between the pair of facing surfaces is equal to or smaller than the radial width of at least one of the pair of metal cylindrical members.

3. The motor according to claim 1, characterized in that The invention further comprises a waterproof layer disposed on at least one of the pair of opposing surfaces.

4. The motor according to claim 3, characterized in that A stator holder is also provided, the stator holder being in a cylindrical shape extending in the axial direction and surrounding the central axis and supporting the stator core; and A bearing is arranged on the inner peripheral surface of the stator retainer. The rotor has: A shaft extending along the central axis and rotatable about the central axis; a rotor hub extending radially outward from one axial end of the shaft; and a cylindrical protruding wall portion extending from the other axial end surface of the rotor hub toward the other axial direction and surrounding the one axial end portion of the bearing; The cylindrical portion of one of the protruding wall portion and the stator holder surrounds the cylindrical portion of the other. The labyrinth portion includes a first labyrinth portion including a pair of first opposing surfaces. The pair of opposing surfaces includes a pair of first opposing surfaces. The pair of first opposing surfaces is composed of a radially inner side surface of the one cylindrical portion and a radially outer side surface of the other cylindrical portion. The radially inner side surface of the one cylindrical portion and the radially outer side surface of the other cylindrical portion are radially opposed to each other with a gap therebetween. The waterproof layer includes a first waterproof layer disposed on at least one of the pair of first opposing surfaces.

5. The motor according to claim 3, characterized in that Also available: a stator holder which is cylindrical and extends in the axial direction and surrounds the central axis, and supports the stator core; and A bearing is arranged on the inner peripheral surface of the stator retainer. The bearing has a cylindrical recessed portion surrounding the central axis. The recessed portion is recessed in one axial direction of the bearing toward the other axial direction and is open toward the radially outward direction. The rotor has: a shaft extending along the central axis and rotatably supported by the bearing; a rotor hub extending radially outward from one axial end of the shaft; and a cylindrical protruding wall portion extending from the other axial end surface of the rotor hub toward the other axial direction and surrounding the one axial end portion of the bearing; The labyrinth portion includes a second labyrinth portion including a pair of second opposing surfaces. The pair of opposing surfaces includes a pair of second opposing surfaces. The pair of second opposing surfaces is composed of a radially inner side surface of the recessed portion and a radially inner side surface of the protruding wall portion which is radially opposed to the radially inner side surface with a gap therebetween. The waterproof layer includes a second waterproof layer disposed on at least one of the pair of second opposing surfaces.

6. The motor according to claim 3, characterized in that A housing is also provided, the housing having a stator holder extending in the axial direction and supporting the stator core. The rotor has: a rotor cover portion, which is arranged axially closer to the stator and extends in the radial direction; and A cylindrical first peripheral wall portion extends from the other axial end surface of the rotor cover portion in the other axial direction and surrounds the stator. The housing also has: a base portion disposed on the other side of the stator in the axial direction and extending radially outward from the stator holder; and A second peripheral wall portion extends from one axial end surface of the base portion in one axial direction and surrounds the stator. One of the first peripheral wall portion and the second peripheral wall portion surrounds the other peripheral wall portion. The labyrinth section includes a third labyrinth section including a pair of third opposing surfaces. The pair of the opposing surfaces includes a pair of the third opposing surfaces. The pair of the third opposing surfaces is composed of a radially inner side surface of the one peripheral wall portion and a radially outer side surface of the other peripheral wall portion. The radially inner side surface of the one peripheral wall portion and the radially outer side surface of the other peripheral wall portion are radially opposed to each other with a gap therebetween. The waterproof layer includes a third waterproof layer disposed on at least one of the pair of third opposing surfaces.

7. The motor according to claim 6, characterized in that A bearing is also provided on the inner peripheral surface of the stator holder. The rotor has: a shaft extending along the central axis and rotatably supported by the bearing; a rotor hub extending radially outward from one axial end of the shaft; and a cylindrical protruding wall portion extending from the other axial end surface of the rotor hub toward the other axial direction and surrounding the one axial end portion of the bearing; An axial width of the pair of third opposing surfaces is greater than an axial length of the protruding wall portion.

8. The motor according to claim 6, characterized in that The rotor also has: a rotor cylinder portion extending axially in the other direction from the radially outer end portion of the rotor cover portion; and a magnet disposed on the radially inner side of the first peripheral wall portion and radially opposed to the stator core; The first peripheral wall portion is a cylindrical magnetic body extending in the axial direction. A portion of the first peripheral wall portion on one axial side is connected to any one of the other axial end portion of the rotor cover portion and the radial inner end portion of the rotor tube portion. The axial length of a portion of the first peripheral wall portion exposed from the any one of the locations is longer than the axial length of a portion connected to the any one of the locations.

9. The motor according to claim 3, characterized in that The waterproof layer is a coating film of a hydrophobic agent.

10. An air supply device, characterized in that: have: The motor according to any one of claims 1 to 9; and The moving blade is rotatable together with the rotor of the motor about the central axis.

Images