Motor and blower equipped with same

Abstract

To provide a motor which can prevent a sealing member from flowing out.SOLUTION: A motor comprises a rotor, a stator, a stator housing part 25, a sealing member, and a lid part. The rotor rotates around a rotation axis. The stator faces the rotor with a gap provided inside in a radial direction. The stator housing part houses the stator and has a cylindrical shape with an opening on one end surface in an axial direction. The sealing member is filled in the stator housing part. The lid part covers the opening. The stator housing part has a cut-out part 2521 and a lead-out piece 2522. The cut-out part is recessed from one end in the axial direction to the other side in the axial direction, and a lead wire 50 connected to the stator is led out from the cut-out part. The lead-out piece protrudes from a bottom part of the cut-out part to the outside in the radial direction, and the lead wire is disposed on the lead-out piece. The lead wire is sandwiched between the lid part and the lead-out piece via an elastic member 29 disposed on an end surface on one side in the axial direction of the lead-out piece.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a motor and a blower device including the same. [Background technology]

[0002] A conventional motor includes a rotor, a stator, a stator housing (stator housing), and a sealing member (insulator). The rotor rotates around a rotation axis. The stator faces the rotor radially inward with a gap between them. The stator housing houses the stator. The sealing member is filled into the stator housing. Lead wires electrically connected to the stator are drawn to the outside of the stator housing (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6280771 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional motors, there is a possibility that the sealing material before hardening may flow out of the stator housing portion along the lead wires.

[0005] An object of the present invention is to provide a motor that can prevent the sealing member from leaking out. [Means for solving the problem]

[0006] An exemplary motor of the present invention includes a rotor, a stator, a stator housing, a sealing member, and a lid. The rotor rotates about a rotation axis. The stator faces the rotor radially inward with a gap therebetween. The stator housing houses the stator and is cylindrical with an opening on one axial end face. The sealing member is filled inside the stator housing. The lid covers the opening. The stator housing has a notch and a lead piece. The notch is recessed from one axial end to the other axial end, and a lead wire connected to the stator is led out. The lead piece protrudes radially outward from the bottom of the notch, and the lead wire is disposed on the lead piece. The lead wire is clamped between the lid and the lead piece via an elastic member disposed on one axial end face of the lead piece. [Effects of the Invention]

[0007] According to an exemplary embodiment of the present invention, it is possible to provide a motor that can prevent the sealing member from leaking out, and a blower device including the motor. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a blower according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the blower according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a vertical cross-sectional perspective view of the air blower according to the first embodiment of the present invention. [Figure 4] FIG. 4 is an enlarged perspective view of a vertical cross section showing a part of the blower according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a perspective view of the motor according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a top view of the motor according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a vertical cross-sectional perspective view of the stator housing portion of the motor according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a vertical cross-sectional view schematically showing a part of the motor according to the first embodiment of the present invention. [Figure 9] FIG. 9 is a vertical cross-sectional view schematically showing a part of a motor according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a vertical cross-sectional view schematically showing a part of a motor according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the direction in which the rotation axis J of the blower 1 extends will be simply referred to as the "axial direction," the direction perpendicular to the rotation axis J of the blower 1 will be simply referred to as the "radial direction," and the direction along the arc centered on the rotation axis J of the blower 1 will be simply referred to as the "circumferential direction." Furthermore, a cross section parallel to the axial direction will be referred to as a "longitudinal cross section." Furthermore, "parallel" does not mean parallel in the strict sense, but includes approximately parallel.

[0010] For ease of explanation, the axial direction will be defined as the up-down direction, and the up-down direction in Figure 1 will be defined as the up-down direction of the blower 1, and the shape and positional relationship of each part will be described. For example, one axial side will be defined as the axial upper side, or upper side. The other axial side will be defined as the axial lower side, or lower side. One axial end will be defined as the upper end, and the other axial end will be defined as the lower end. One axial end face will be defined as the upper end face, and the other axial end face will be defined as the lower end face. In the blower 1, the "upper side" is the "intake side" and the "lower side" is the "exhaust side." Note that this definition of the up-down direction does not limit the orientation and positional relationship of the blower 1 when in use.

[0011] First Embodiment <1. Overall configuration of the blower> 1 and 2 are a perspective view and an exploded perspective view of an example of a blower 1 according to a first embodiment of the present invention. The blower 1 includes a motor 20, an impeller 30, and a housing 40.

[0012] The impeller 30 is fixed to the motor 20 and rotates around the rotation axis J, generating an airflow along the rotation axis J on the axially lower side (the other axial side) Z1.

[0013] The housing 40 is formed in a cylindrical shape extending along the rotation axis J, and has an air flow passage 41 that is open at both axial end faces and through which air flows. The motor 20 and impeller 30 are accommodated inside the housing 40. The housing 40 has an exhaust port 42 (see FIG. 3) at its lower end face (the other axial end face) and an intake port 43 at its upper end side (one axial end face).

[0014] <2. Housing configuration> The housing 40 is configured by connecting an upper housing portion 40a and a lower housing portion 40b in the axial direction. The upper housing portion 40a and the lower housing portion 40b are resin molded products. In this embodiment, the housing 40 can be separated into the upper housing portion 40a and the lower housing portion 40b, but the upper housing portion 40a and the lower housing portion 40b may also be formed integrally. The upper housing portion 40a has an upper body portion 401a, a fixing portion 402a, and connecting portions 403a and 403b. The upper body portion 401a is formed in a cylindrical shape extending in the axial direction.

[0015] The fixed portion 402a and the connecting portions 403a, 403b constitute a lid portion 27 that covers an opening 25a (see FIG. 4) of the stator accommodating portion 25, which will be described later. The lid portion 27 is part of the housing 40 and also part of the motor 20. The fixed portion 402a is disposed on the axially upper side (one axial side) Z2 of the stator accommodating portion 25, which will be described later, and has a disk shape that expands in the radial direction with the rotation axis J as the center. A stator 23, which will be described later, of the motor 20 is fixed to the fixed portion 402a. That is, the fixed portion 402a is formed in a plate shape to which the stator 23 is fixed.

[0016] The connecting portions 403a and 403b extend radially outward from the fixed portion 402a and connect the fixed portion 402a to the housing body portion 40c. Multiple connecting portions 403a are arranged in the circumferential direction and axially face the accommodating recess 252a, which will be described later. One connecting portion 403b is arranged in the circumferential direction and axially faces the pull-out piece 2522, which will be described later. Air flowing through the air-blowing flow path 41 passes between adjacent connecting portions 403a and 403b.

[0017] Furthermore, the connecting portion 403a is formed so as to be inclined in one direction in the circumferential direction as it moves from the radially inner end to the radially outer side. This allows the airflow flowing into the housing 40 from the air intake port 43 to flow smoothly along the connecting portion 403a. Therefore, the air blowing efficiency of the blower 1 can be further improved. The connecting portion 403a may be formed so as to be inclined in the other direction in the circumferential direction as it moves from the radially inner end to the radially outer side. The connecting portion 403a may be formed so as to extend linearly in the radial direction. The connecting portion 403b is formed so as to extend linearly in the radial direction.

[0018] The connecting portion 403a has a connecting recess 405a (see FIG. 4). The connecting recess 405a is disposed opposite the stator accommodating portion 25 in the axial direction and is recessed from the lower end face (the end face on the other axial side) of the connecting portion 403a toward one axial side. This prevents the stator accommodating portion 25 from coming into contact with the connecting portion 403a when the stator accommodating portion 25 vibrates in the axial direction.

[0019] The lower housing portion 40b has a lower body portion 401b that extends in the axial direction and is formed into a cylindrical shape. The lower body portion 401b and the upper body portion 401a are connected in the axial direction to form the housing body portion 40c. That is, the blower 1 includes the housing body portion 40c, which is formed into a cylindrical shape and extends along the rotation axis J, with both axial end faces open and having an air flow path 40a therein. The motor 20 and the impeller 30 are housed inside the housing body portion 40c.

[0020] <3. Impeller configuration> The impeller 30 has an impeller cup 31 and a plurality of blades 32. The impeller cup 31 is fixed to the radially outer side of a rotor 24 (described later) of the motor 20. The plurality of blades 32 are arranged in the circumferential direction on the radially outer surface of the impeller cup 31.

[0021] <4. Motor configuration> Fig. 3 is a vertical cross-sectional perspective view of blower device 1, and Fig. 4 is a vertical cross-sectional perspective view showing an enlarged portion of blower device 1. Motor 20 includes shaft 21, bearing 22, stator 23, rotor 24, stator housing 25, sealing member 26, the above-mentioned lid 27, and circuit board 28.

[0022] The shaft 21 extends along the rotation axis J. The shaft 21 is made of a metal such as stainless steel, and is a columnar member extending in the axial direction.

[0023] The bearings 22 are arranged in pairs, spaced apart at least in the axial direction. The bearings 22 are, for example, ball bearings, but may also be sleeve bearings or the like. The pair of bearings 22 support the shaft 21 rotatably about the rotation axis J relative to the stator 23.

[0024] The stator 23 faces the rotor 24 radially inward with a gap therebetween. The stator 23 has a bearing holder 231, a stator core 232, an insulator 233, and a coil 234. The bearing holder 231 is formed in a cylindrical shape and holds the bearing 22 therein.

[0025] An upper end portion (one axial end portion) of the bearing holder 231 is fitted into a fitting hole 404a of the fixed portion 402a via a connector 45. As a result, the bearing holder 231 is fixed to the fixed portion 402a, and the stator 23 and the housing 40 are fixed together. The fitting hole 404a is formed by penetrating the fixed portion 402a in the axial direction. The connector 45 is formed in an annular shape and is disposed on the inner circumferential surface of the fitting hole 404a. The bearing holder 231 is disposed on the inner circumferential surface of the connector 45. Furthermore, a lower end portion (the other axial end portion) of the bearing holder 231 is fixed to the stator accommodating portion 25, which will be described later. Note that the connector 45 may be omitted and the upper end portion (one axial end portion) of the bearing holder 231 may be directly fitted into the fitting hole 404a.

[0026] Stator core 232 is formed by laminating electromagnetic steel plates, such as silicon steel plates, one above the other. Insulator 233 is formed from an insulating resin. Stator core 232 has an annular core back (not shown) and a plurality of teeth (not shown) that protrude radially outward from the core back and are arranged in the circumferential direction. Insulator 233 is provided on part of the axial outer surface and part of the circumferential outer surface of the teeth. Coil 234 is formed from a conducting wire wound around stator core 232 via insulator 233.

[0027] The rotor 24 rotates around a rotation axis J relative to the stator 23. The rotor 24 includes a rotor yoke 241 and a magnet 242.

[0028] Rotor yoke 241 is made of a magnetic material and is a substantially cylindrical member having a lid on the axially inner side. Rotor yoke 241 is fixed to the lower end (other axial end) of shaft 21. Magnet 242 is cylindrical and is fixed to the inner circumferential surface of rotor yoke 241. As a result, magnet 242 is disposed radially outside stator 23.

[0029] The circuit board 28 is in contact with the upper end (one axial end) of the insulator 233 and is disposed between the stator core 232 and the lid portion 27. The circuit board 28 is, for example, in the shape of a disk extending in the radial direction about the rotation axis J. The circuit board 28 has a board through hole 28a. The board through hole 28a is disposed on the rotation axis J and passes through in the axial direction. The upper end (one axial end) of the bearing holder 231 is inserted through the board through hole 28a and extends axially upward (one axial side) Z2 beyond the circuit board 28.

[0030] Conductive wires (not shown) that constitute the coil 234 are electrically connected to the circuit board 28. An electronic circuit for supplying a drive current to the coil 234 is mounted on the circuit board 28. The circuit board 28 is also connected to lead wires 50 (see FIGS. 6 and 7), and the lead wires 50 are drawn to the outside of the stator accommodating portion 25 and connected to an external power source. The lead wires 50 are electrically connected to the coil 234, and the lead wires 50 and the stator 23 are electrically connected. In this embodiment, three lead wires 50 are drawn to the outside of the stator accommodating portion 25.

[0031] 5. Configuration of the stator housing 5 and 6 are a perspective view and a top view of the motor 20, and Fig. 7 is a vertical cross-sectional perspective view of the stator housing portion 25. Note that in Figs. 5 and 6, the rotor 24, sealing member 26, and lid portion 27 are not shown, and the elastic member 29 is indicated by a dashed line. Furthermore, in Fig. 5, the lead wire 50 is not shown, and in Figs. 6 and 7, the lead wire 50 is indicated by a dashed line.

[0032] The stator accommodating portion 25 is formed in a cylindrical shape and has an opening 25a on one axial end face (the end face on one axial side). The stator accommodating portion 25 accommodates the shaft 21, bearing 22, stator 23, and circuit board 28 therein. A sealing member 26 is filled inside the stator accommodating portion 25 (see FIG. 4). This integrates the shaft 21, bearing 22, stator 23, and circuit board 28, improving the ease of assembly of the motor 20.

[0033] Stator core 232 is press-fitted into the inner peripheral surface of stator accommodating portion 25. At this time, the radial outer surfaces of the teeth (not shown) come into contact with the inner peripheral surface of stator accommodating portion 25. In addition, the outer peripheral surface of stator accommodating portion 25 faces magnet 242 in the radial direction via a gap (see FIG. 3).

[0034] Sealing member 26 is made of a curable insulating resin, such as epoxy resin, silicone rubber, or polyurethane resin. Liquid sealing member 26 is filled into stator accommodating portion 25 through opening 25a and hardens after a predetermined time has passed. As a result, stator 23 and circuit board 28 are covered with hardened sealing member 26, improving the waterproof and oil-proof properties of stator 23 and circuit board 28.

[0035] The stator accommodating portion 25 has a stator cylindrical portion 251 , a substrate cylindrical portion 252 , an intermediate cylindrical portion 253 , an accommodating lid portion 254 , and an accommodating inclined portion 255 .

[0036] The stator cylindrical portion 251 surrounds the stator 23 from the radially outer side. The board cylindrical portion 252 surrounds the circuit board 28 from the radially outer side. The intermediate cylindrical portion 253 connects the stator cylindrical portion 251 and the board cylindrical portion 252 together.

[0037] The housing lid portion 254 covers the stator 23 from the axial lower side (the other axial side) Z1 and extends radially. The housing lid portion 254 has a housing through-hole 254a and a housing holder 254b that penetrate in the axial direction. The lower end portion (the other axial end portion) of the bearing holder 231 is fitted into the housing through-hole 254a (see FIG. 3). This fixes the stator housing portion 25 to the bearing holder 231. The housing holder 254b is formed in a cylindrical shape and protrudes from the periphery of the housing through-hole 254a toward the axial upper side (one axial side) Z2. The housing holder 254b holds the lower end portion (the other axial end portion) of the bearing holder 231.

[0038] The substrate tubular portion 252 has an accommodating recess 252a. The accommodating recess 252a is disposed at the upper end (one end in the axial direction) of the stator accommodating portion 25 and is recessed radially outward from the radial inner surface. A gap S is formed radially between the radial outer edge of the circuit board 28 and the accommodating recess 252a. In this embodiment, the accommodating recesses 252a are formed by forming a part of the substrate tubular portion 252 in a convex shape radially outward, and are provided in three locations at equal intervals in the circumferential direction. Note that the number of accommodating recesses 252a is not limited to three. Providing the accommodating recesses 252a allows the sealing member 26 to smoothly flow from the gap S into the interior of the stator accommodating portion 25. This improves the ease of assembly of the blower device 1.

[0039] When viewed from the axial direction, at least a portion of the accommodating recess 252a overlaps with the connecting portion 403a of the cover portion 27 (see FIG. 4). In this embodiment, the circumferential width of the accommodating recess 252a is equal to or less than the circumferential width of the connecting portion 403a, and when viewed from the axial direction, the entire accommodating recess 252a overlaps with the connecting portion 403a. This reduces turbulence in the vicinity of the accommodating recess 252a of the airflow that passes between adjacent connecting portions 403a and flows into the housing 40. This improves the air blowing efficiency of the blower 1.

[0040] Furthermore, the radial protrusion amount of the accommodating recess 252a is equal to or less than half the radial size of the connecting portion 403a. This further reduces turbulence near the accommodating recess 252a in the airflow that passes between adjacent connecting portions 403a and flows into the housing 40. Note that the radial protrusion amount of the accommodating recess 252a is preferably as small as possible, as long as the gap S is of a predetermined size.

[0041] The intermediate cylindrical portion 253 is inclined radially inward toward the axially lower side (the other axial side) Z1. This allows the sealing member 26 to smoothly flow from the base plate cylindrical portion 252 along the intermediate cylindrical portion 253 into the stator cylindrical portion 251.

[0042] The accommodating inclined portion 255 connects the stator tube portion 251 and the accommodating lid portion 254, and is inclined radially inward as it moves axially downward (the other axial side) Z1. This allows the sealing member 26 to smoothly flow along the accommodating inclined portion 255 from the stator tube portion 251 to the radially inner side of the accommodating lid portion 254. Furthermore, the amount of resin in the sealing member 26 can be reduced, resulting in reduced manufacturing costs.

[0043] The stator accommodating portion 25 also has an accommodating protrusion 251a that protrudes from the radially inner surface and extends in the axial direction (see FIG. 7). In this embodiment, the accommodating protrusion 251a is arranged on the radially inner surface of the stator cylindrical portion 251. The accommodating protrusion 251a is fitted into a groove (not shown) that is formed on the radially outer surface of the stator core 232 and extends in the axial direction. This makes it easy to position the stator core 232 in the circumferential direction within the stator accommodating portion 25. When the stator core 232 is accommodated in the stator accommodating portion 25, the accommodating protrusion 251a is press-fitted between circumferentially adjacent teeth (not shown).

[0044] <6. Configuration of the notch> The stator accommodating portion 25 further has a notch 2521 and a pull-out piece 2522 .

[0045] The cutout 2521 is recessed from the upper end (one axial end) of the stator accommodating portion 25 axially downward (the other axial side) Z1, and the lead wires 50 are drawn out radially outward (see FIG. 7).

[0046] The pull-out piece 2522 is formed in a plate shape and protrudes radially outward from the bottom of the cutout portion 2521. A rectangular parallelepiped elastic member 29 is arranged on the upper surface (end surface on one axial side) of the pull-out piece 2522. A lead wire 50 is arranged on the upper surface (end surface on one axial side) of the elastic member 29. The upper end (one axial end) of the elastic member 29 is arranged axially above (on one axial side) Z2 of the upper end (one axial end) of the board tubular portion 252.

[0047] As a result, even if the sealing member 26 before hardening flows out to the outside of the notch 2521, it is blocked by the elastic member 29. Therefore, the sealing member 26 before hardening can be prevented from flowing out to the outside of the stator accommodating portion 25 through the notch 2521. At this time, the upper end (one axial end) of the elastic member 29 is disposed axially above (on one axial side) Z2 of the upper end (one axial end) of the sealing member 26 after hardening.

[0048] The elastic member 29 is fixed to the pull-out piece 2522 via an adhesive layer 29a (see FIG. 7). This allows the elastic member 29 to be easily fixed to the pull-out piece 2522, improving the workability of assembling the motor 20. The elastic member 29 is made of, for example, a rubber material.

[0049] By providing the pull-out pieces 2522, the lead wires 50 can be pulled out radially outward without being bent significantly in the axial direction, while being supported by the pull-out pieces 2522. Therefore, damage to the lead wires 50 can be prevented.

[0050] The drawn piece 2522 has a drawn inclined portion 2522a, a drawn protrusion 2522b, and a pair of drawn wall portions 2522c. The drawn inclined portion 2522a is inclined axially upward (to one axial side) Z2 as it extends radially outward from the bottom of the cutout portion 2521. The provision of the drawn inclined portion 2522a makes it possible to more effectively prevent the sealing member 26, before it hardens, from leaking out of the stator accommodating portion 25 through the cutout portion 2521.

[0051] The drawn-out protrusion 2522b is disposed adjacent to the cutout portion 2521 on the radially outer side, and protrudes from the upper surface (the end surface on one axial side) of the drawn-out piece 2522. By providing the drawn-out protrusion 2522b, the positioning of the elastic member 29 can be easily performed.

[0052] The drawn-out wall portion 2522c extends radially, protruding axially upward (one axial side) Z2 from both radial ends of the drawn piece 2522. The radially inner end of the drawn-out wall portion 2522c is connected to the outer peripheral surface of the substrate tubular portion 252. The upper end (one axial end) of the drawn-out wall portion 2522c is disposed axially upward (one axial side) Z2 relative to the upper end (one axial end) of the substrate tubular portion 252. This further prevents the sealing member 26 from leaking out of the stator accommodating portion 25 through the cutout portion 2521 before hardening.

[0053] The lead piece 2522 is disposed axially opposite the connecting portion 403b (lid portion 27). At this time, the lead wire 50 is sandwiched between the connecting portion 403b (lid portion 27) and the lead piece 2522 via the elastic member 29. At this time, the elastic member 29 deforms along the outer peripheral surface of the lead wire 50, making it difficult for a minute gap to form between the lead wire 50 and the elastic member 29. This prevents the sealing member 26, before hardening, from passing between the lead wire 50 and the elastic member 29 due to capillary action along the lead wire 50. This prevents the sealing member 26 from leaking out of the stator accommodating portion 25. This makes it possible to provide a motor 20 that can prevent the sealing member 26 from leaking out.

[0054] 7. Configuration of the stator housing and the lid 8 is a vertical cross-sectional view schematically showing a part of the motor 20. The upper end (one axial end) of the stator accommodating portion 25 is located axially lower (the other axial side) Z1 than the lower end (the other axial end) of the cover portion 27, which is radially inward of the upper end (one axial end) of the stator accommodating portion 25.

[0055] The sealing member 26 may bulge and harden axially upward (one axial side) Z2 along the radial inner surface of the stator accommodating portion 25, potentially forming a fillet at the radial outer end of the sealing member 26. The fillet does not bulge axially upward (one axial side) Z2 beyond the upper end (one axial end) of the stator accommodating portion 25. As a result, even if a fillet is formed along the radial inner surface of the stator accommodating portion 25, the upper end (one axial end) of the fillet is located axially downward (the other axial side) Z1 from the lower end (the other axial end) of the lid portion 27. This prevents contact between the lid portion 27 covering the opening 25a and the sealing member 26. This allows the motor 20 to be made smaller in size in the axial direction.

[0056] In this embodiment, the sealing member 26 is filled up to the upper end (one axial end) of the stator accommodating portion 25, and the upper end (one axial end) of the hardened sealing member 26 is positioned axially above (one axial side) Z2 of the upper end (one axial end) of the stator accommodating portion 25 or at the same height in the axial direction as the one axial end of the stator accommodating portion 25. In this case, no fillet is formed at the radial outer end of the sealing member 26 along the radial inner surface of the stator accommodating portion 25. Therefore, variation in the height of the upper end (end face on one axial side) of the sealing member 26 between products can be reduced. This allows the lid portion 27 to be positioned close to the upper end (one axial end) of the stator accommodating portion 25 while preventing contact between the lid portion 27 and the sealing member 26. Therefore, the motor 20 can be made smaller in the axial direction.

[0057] Furthermore, the upper end surface (one axial end surface) of the sealing member 26 is formed perpendicular to the axial direction, which allows the lid portion 27 to be disposed closer to the upper end (one axial end) of the stator accommodating portion 25.

[0058] When the upper end (one axial end) of the hardened sealing member 26 is disposed axially lower (the other axial side) Z1 than the upper end (one axial end) of the stator accommodating portion 25, the upper end (one axial end) of the stator accommodating portion 25 can be disposed close to the lid portion 27. At this time, a connecting recess 405a is formed in the lower end surface (end surface on the other axial side) of the connecting portion 403a, and it is possible to prevent the upper end (one axial end) of the stator accommodating portion 25 and the lid portion 27 from coming into contact with each other.

[0059] Furthermore, the upper end (one axial end) of the bearing holding portion 231 extends axially upward (to one axial side) Z2 beyond the upper end (one axial end) of the stator accommodating portion 25 and is fixed to the lid portion 27. This allows the lid portion 27 and the stator accommodating portion 25 to be easily fixed together via the bearing holding portion 231 with a small number of parts, while the lid portion 27 and the upper end portion of the stator accommodating portion 25 filled with the sealing member 26 are not in contact with each other.

[0060] The bearing holder 231 has a holding protrusion 2311. The holding protrusion 2311 is disposed axially above (on one axial side) Z2 the upper end (one axial end) of the circuit board 28. The holding protrusion 2311 is formed in an annular shape and protrudes radially outward from the radial outer surface. The lower end (the other axial end) of the holding protrusion 2311 is located at approximately the same height as the upper end (one axial end) of the stator accommodating portion 25 in the axial direction. The holding protrusion 2311 may be integral with or separate from the bearing holder 231. When the holding protrusion 2311 is separate from the bearing holder 231, the holding protrusion 2311 is attached to the bearing holder 231 after the circuit board 28 is disposed on the upper end (one axial end) of the insulator 233. This improves the ease of assembly of the circuit board 28.

[0061] When the sealing member 26 attempts to rise axially upward (one axial end) Z2 along the radial outer surface of the bearing holding portion 231 and harden, the holding protrusion 2311 can suppress the rising of the sealing member 26. This prevents the lid portion 27 covering the opening 25a from coming into contact with the sealing member 26. Furthermore, by arranging the lower end (the other axial end) of the holding protrusion 2311 at approximately the same height as the upper end (one axial end) of the stator accommodating portion 25 in the axial direction, when the sealing member 26 is filled up to the upper end (one axial end) of the stator accommodating portion 25, it is possible to easily form an upper end surface (end surface on one axial side) of the sealing member 26 that is perpendicular to the axial direction.

[0062] Furthermore, the radially outer end of the holding protrusion 2311 is located radially outward from the periphery of the substrate through-hole 28a, which allows the holding protrusion 2311 to protrude further radially outward, thereby more reliably preventing the sealing member 26 from rising.

[0063] The holding protrusion 2311 also has a curved surface 2312. The curved surface 2312 is disposed at the other axial end of the holding protrusion 2311, and is inclined axially upward (to one axial side) Z2 as it extends radially outward, and is curved convexly radially outward. This allows the holding protrusion 2311 to more reliably prevent the sealing member 26 from rising.

[0064] Furthermore, the holding protrusion 2311 has a plurality of grooves 2311a formed on its radial outer surface. By forming the grooves 2311a, it becomes difficult for a fillet to form along the radial outer surface of the holding protrusion 2311 when the sealing member 26 hardens. Therefore, the holding protrusion 2311 can more reliably prevent the sealing member 26 from rising. The grooves 2311a are formed by, for example, knurling.

[0065] Second Embodiment Next, a second embodiment of the present invention will be described. Fig. 9 is a longitudinal cross-sectional view showing a schematic view of a portion of a motor 20. For ease of explanation, the same parts as those in the first embodiment shown in Figs. 1 to 8 described above are denoted by the same reference numerals. The second embodiment differs from the first embodiment in that an oil-repellent layer 2313 is formed on the radial outer surface of a bearing holder 231 instead of the holder protrusion 2311. The other parts are the same as those in the first embodiment.

[0066] The oil-repellent layer 2313 is disposed axially above (on one axial side) Z2 the upper end (one axial end) of the circuit board 28. The oil-repellent layer 2313 is made of, for example, fluororesin, and repels the sealing member 26.

[0067] As a result, when sealing member 26 rises axially upward (to one axial side) along the radial outer surface of bearing holder 231 and attempts to harden, sealing member 26 is repelled by oil-repellent layer 2313. Therefore, oil-repellent layer 2313 can suppress the rising of sealing member 26. This can prevent contact between lid portion 27 covering opening 25a and sealing member 26.

[0068] Furthermore, the lower end (the other axial end) of the oil repellent layer 2313 is located at approximately the same height in the axial direction as the upper end (one axial end) of the stator accommodating portion 25. This makes it possible to easily form an upper end surface (end surface on one axial side) of the sealing member 26 that is perpendicular to the axial direction when the sealing member 26 is filled up to the upper end (one axial end) of the stator accommodating portion 25. Note that, in this embodiment, the oil repellent layer 2313 is formed on the radial outer surface of the bearing holder 231, but the oil repellent layer 2313 may also be formed on the radial outer surface of the holder protrusion 2311 of the first embodiment.

[0069] Third Embodiment Next, a third embodiment of the present invention will be described. Fig. 10 is a vertical cross-sectional view showing a part of the motor 20. For ease of explanation, the same parts as those in the first embodiment shown in Figs. 1 to 8 are denoted by the same reference numerals. In the third embodiment, the position of the holding protrusion 2311 differs from that of the first embodiment. The other parts are the same as those in the first embodiment.

[0070] The upper end (one axial end) of the retaining protrusion 2311 is located at approximately the same height in the axial direction as one axial end of the stator accommodating portion 25. When the sealing member 26 is filled up to the upper end (one axial end) of the stator accommodating portion 25, the sealing member 26 bulges axially upward (one axial side) Z2 from the upper end of the retaining protrusion 2311 along the radial outer surface of the bearing retaining portion 231, and is therefore less likely to harden. Therefore, at the radial inner end of the sealing member 26, a fillet does not extend beyond the retaining protrusion 2311 and is not formed along the radial outer surface of the bearing retaining portion 231. This reduces variation in the height of the upper end (end face on one axial side) of the sealing member 26 between products.

[0071] The holding protrusion 2311 may be integral with or separate from the bearing holding portion 231. When the holding protrusion 2311 is separate from the bearing holding portion 231, the holding protrusion 2311 is attached to the bearing holding portion 231 after the circuit board 28 is placed on the upper end (one axial end) of the insulator 233. This improves the workability of assembling the circuit board 28.

[0072] <8.Other> The above describes the embodiments of the present invention. However, the scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented with various modifications without departing from the spirit of the invention. Furthermore, the above-described embodiments can be combined in any suitable manner. For example, an oil-repellent layer 2313 may be formed on the radial outer surface of the bearing holder 231 on which the groove 2311a of the first embodiment is formed. [Industrial Applicability]

[0073] The present invention can be used, for example, in a cooling device equipped with a blower. [Explanation of symbols]

[0074] 1. Blower 20 Motor 21 Shaft 22 Bearings 23 Stator 24 rotors 25 Stator housing 25a opening 26 Sealing member 27 Lid 28 Circuit Board 28a Board through hole 29 Elastic member 29a Adhesive layer 30 impeller 31 Impeller cup 32 Feather 40 Housing 40a Upper housing part 40b Lower housing part 40c housing body 41 Air flow path 42 Exhaust port 43 Air intake 45 connector 50 lead wire 231 Bearing holder 232 stator core 233 Insulator 234 Coil 241 rotor yoke 242 Magnet 251 Stator cylinder 251a Storage protrusion 252 Board cylinder 252a Receiving recess 253 Intermediate cylinder part 254 Storage lid 254a Storage hole 254b Storage and holding section 255 Storage ramp 401a Upper torso 401b Lower body 402a Fixed part 403a, 403b connection part 404a Fitting hole 405a Connection recess 2311 Retaining protrusion 2311a Groove 2312 curved surface 2313 Oil repellent layer 2521 Notch 2522 Drawer piece 2522a Drawer ramp 2522b Drawer protrusion 2522c Drawer wall J rotation axis S Gap

Claims

1. a rotor that rotates around a rotation axis; a stator facing the rotor radially inward with a gap therebetween; a cylindrical stator accommodating portion that accommodates the stator and has an opening on one end surface in the axial direction; a sealing member filled in the stator accommodating portion; a lid portion that covers the opening, The stator accommodating portion is a notch at one end of the axial direction of the rotor, the notch being recessed toward the other end of the axial direction, and through which a lead wire electrically connected to the stator is drawn radially outward; a lead piece that protrudes radially outward from a bottom portion of the other axial end of the notch and on which the lead wire is disposed, The lead wire is clamped between the cover and the pull-out piece via an elastic member arranged on one axial end face of the pull-out piece.

2. The drawer piece is 2. The motor according to claim 1, further comprising a protruding portion protruding from an end face on one axial side.

3. The drawer piece is 3. The motor according to claim 1, further comprising a lead-out inclined portion that is inclined toward one axial side from a bottom of the other axial end of the notch portion toward the radially outer side.

4. The drawer piece is 4. The motor according to claim 1, further comprising a lead-out side wall portion extending radially and projecting from both radial end portions to one axial side.

5. The stator accommodating portion is a stator cylindrical portion surrounding the stator from the radially outer side; a housing lid portion that covers the stator from the other axial side and extends in a radial direction; The motor according to any one of claims 1 to 4, further comprising an inclined housing portion that connects the stator cylinder portion and the housing lid portion and that inclines radially inward as it approaches the other axial side.

6. The stator accommodating portion is The motor according to any one of claims 1 to 5, further comprising a housing protrusion that protrudes from the radially inner surface and extends in the axial direction.

7. 7. The motor according to claim 1, wherein the elastic member is fixed to the pull-out piece via an adhesive layer.

8. The motor according to any one of claims 1 to 7, wherein the elastic member is made of a rubber member.

9. 9. The motor according to claim 1, wherein one axial end of the elastic member is disposed on one axial side of one axial end of the sealing member.

10. A motor according to any one of claims 1 to 9; an impeller fixed to the rotor to generate an airflow in the axial direction; a housing body portion that is formed in a cylindrical shape and extends along the rotation axis, has open end faces in the axial direction, and has an air flow passage therein; The motor and the impeller are housed inside the housing body.

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