JP2020115717A - Motor and blower - Google Patents

Abstract

To provide a motor and a blower that can be easily installed between lead wires and a circuit board, and that can inhibit disconnection between the lead wires and the circuit board.SOLUTION: A motor comprises: a rotor 1 having a shaft 11 extending along a central axis extending up and down; a stator 2 diametrically opposed to the rotor; a bearing 3 supporting the shaft rotatably; a bearing housing 4 holding the bearing and the stator; a circuit board 5 disposed on the lower axial side of the stator and having an open hole 52 penetrating axially; and a plurality of lead wires 6 electrically connected to the circuit board. The bearing housing and the lead wires are threaded through the open hole.SELECTED DRAWING: Figure 2

Description

The present invention relates to a motor and a blower.

The brushless motor disclosed in Japanese Patent Application Laid-Open No. 11-089183 includes a flexible printed circuit board attached to a housing and lead wires. The flexible printed circuit board has a land portion, and the lead wire is attached to the flexible printed circuit board by soldering the lead wire to the land portion.

JP-A-11-089183

For example, in the brushless motor disclosed in Japanese Patent Application Laid-Open No. 11-089183, solder is simply soldered to the land portion of the flexible printed circuit board, and if the lead wire is pulled or the motor itself vibrates, the solder The force may be concentrated on the attachment portion, and the flexible printed circuit board and the lead wire may be disconnected.

Therefore, it is an object of the present invention to provide a motor and a blower that can easily attach a lead wire to a circuit board and can prevent disconnection between the lead wire and the circuit board.

An exemplary motor according to the present invention includes a rotor having a shaft extending along a vertically extending central axis, a stator radially opposed to the rotor, a bearing rotatably supporting the shaft, the bearing, and the bearing. A bearing housing for holding the stator; a circuit board disposed axially below the stator and having a through hole penetrating in the axial direction; and a plurality of lead wires electrically connected to the circuit board. The bearing housing and the lead wire are passed through the through hole.

According to the exemplary motor of the present invention, since the lead wire is passed through the through hole provided in the circuit board together with the bearing housing, the work of attaching the lead wire to the circuit board is simplified. Further, since the lead wire is held by the bearing housing and the circuit board, it is possible to provide a motor and a blower that can prevent disconnection between the circuit board and the lead wire.

FIG. 1 is a front view showing an example of an air blower according to the present invention. FIG. 2 is a sectional view of the motor. FIG. 3 is a bottom view of the motor shown in FIG. FIG. 4 is a bottom view of the circuit board. FIG. 5 is a sectional view of a motor having another configuration according to this embodiment. FIG. 6 is a bottom view of the motor shown in FIG. FIG. 7 is a sectional view of a motor having another configuration according to this embodiment. FIG. 8 is a sectional view of a motor having another configuration according to this embodiment. FIG. 9 is a sectional view of a motor having another configuration according to this embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the direction parallel to the central axis C1 of the blower A is the "axial direction", the direction orthogonal to the central axis C1 of the blower A is the "radial direction", and the central axis C1 of the blower A is the center. The direction along the arc is defined as "circumferential direction". Further, in the present specification, in the blower device A, the shape and the positional relationship of each part will be described with the axial direction as the vertical direction and the side of the shaft 11 to which the impeller 200 is attached as the top. The vertical direction is used for the purpose of description, and the positional relationship and direction in the usage state of the blower device A are not limited.

<1. Configuration of blower A>
FIG. 1 is a front view showing an example of an air blower A according to the present invention. As shown in FIG. 1, the air blower A according to the present embodiment includes a motor 100 and an impeller 200. The impeller 200 is fixed to a shaft 11 of a rotor 1 of the motor 100, which will be described later, and is rotated by driving the motor 100. Due to the rotation of the impeller 200, an airflow downward in the axial direction is generated. That is, the air blower A includes a motor 100 and an impeller 200 that is fixed to the rotor 1 and rotates together with the rotor 1.

<2. Configuration of Motor 100>
FIG. 2 is a sectional view of the motor 100. FIG. 3 is a bottom view of the motor 100 shown in FIG. As shown in FIGS. 2 and 3, the motor 100 includes a rotor 1, a stator 2, a bearing 3, a bearing housing 4, a circuit board 5, and a plurality of lead wires 6.

The rotor 1 has a shaft 11 extending along a central axis C1 extending vertically. The stator 2 faces the rotor 1 in the radial direction. The bearing 3 rotatably supports the shaft 11. The bearing housing 4 holds the bearing 3 and the stator 2. The circuit board 5 has a through hole 52, which will be described later and is arranged on the lower side of the stator 2 in the axial direction and penetrates in the axial direction. The lead wires 6 are electrically connected to the circuit board 5. Hereinafter, details of each part of the rotor 1, the stator 2, the bearing 3, the bearing housing 4, the circuit board 5, and the lead wire 6 will be described.

<2.1 About rotor 1>
The rotor 1 includes a shaft 11, a rotor housing 12, and a rotor magnet 13. The shaft 11 is arranged along a central axis C1 extending vertically. The shaft 11 is, for example, a columnar member made of metal. However, the shaft 11 may have a shape different from a columnar shape such as a cylindrical shape. The shaft 11 may be made of a material other than metal, such as ceramic. In the present embodiment, the shaft 11 rotates about the central axis C1. The shaft 11 is provided with an annular recess that is recessed in the radial direction on the outer surface at the lower end in the axial direction, and by attaching the retaining member 111 to the annular recess, the axial removal of the shaft 11 is suppressed.

The rotor housing 12 is a covered cylindrical body. The rotor housing 12 includes a rotor lid portion 121 and a rotor cylinder portion 122. The rotor lid 121 expands in the radial direction. The rotor lid 121 has a shaft hole 123 at its central portion that penetrates in the axial direction. The shaft 11 is inserted into the shaft hole 123 and fixed to the rotor lid 121. The shaft 11 is fixed to the shaft hole 123 by press fitting, but the present invention is not limited to this and may be fixed by a fixing method such as adhesion. The rotor tubular portion 122 has a tubular shape that extends axially downward from a radially outer edge portion of the rotor lid portion 121. The rotor tubular portion 122 has a cylindrical shape. The rotor tubular portion 122 is fixed to the rotor lid portion 121. The rotor lid 121 and the rotor cylinder 122 may be formed as the same member.

The rotor magnet 13 has a cylindrical shape and is fixed to the inner surface of the rotor tubular portion 122. The rotor magnet 13 may be press-fitted into the inner surface of the rotor tubular portion 122, or may be fixed by a fixing method such as adhesion. On the inner side surface of the rotor magnet 13, N poles and S poles are alternately arranged in the circumferential direction. The rotor magnet 13 may be composed of one magnet, or may be composed of a plurality of magnet pieces arranged in the circumferential direction.

<2.2 About stator 2>
The stator 2 faces the rotor 1 in the radial direction. The stator 2 is an armature that generates a magnetic flux according to a drive current. The stator 2 includes a stator core 21 and a winding wire 23.

The stator core 21 is a magnetic body. The stator core 21 is formed by stacking, for example, electromagnetic steel plates in the axial direction. The stator core 21 includes an annular core back portion 211 and a plurality of teeth portions 212. The plurality of teeth portions 212 project outward from the core back portion 211 in the radial direction. The plurality of teeth portions 212 radially face the radially inner surface of the rotor 1 (see FIG. 2 and the like).

The outer surface of the stator core 21 is coated with an insulating coating 22 such as powder coating. The insulating coating 22 insulates the stator core 21 and the winding wire 23 from each other.

The winding wire 23 is configured by winding a conductive wire on the insulating coating 22 formed on the outer surface of the tooth portion 212. By supplying the drive current to the winding wire 23, a rotational torque is generated between the rotor 1 and the stator 2. As a result, the rotor 1 rotates with respect to the stator 2. As shown in FIG. 2, the winding wire 23 projects vertically from the stator core 21, and the winding wire 23 is arranged at the upper end and the lower end of the stator 2. The motor 100 is provided with, for example, three-system windings 23 through which three-system currents having different phases are respectively passed.

The motor 100 of the present embodiment is an outer rotor type motor in which the rotor 1 is arranged radially outside the stator 2. However, the motor 100 may be an inner rotor type motor in which the rotor 1 is arranged radially inward of the stator 2.

<2.3 Bearing 3>
The motor 100 includes two bearings 3. In the following description, the upper bearing 3a and the lower bearing 3b will be described when it is necessary to distinguish them. The bearing 3 rotatably supports the shaft 11. In this embodiment, the bearing 3 is a ball bearing. The bearing 3 includes an outer ring 31, an inner ring 32, and a plurality of balls 33. The shaft 11 is fixed to the inner ring 32 of the bearing 3. The outer ring 31 of the bearing 3 is fixed to the bearing housing 4. In the present embodiment, the upper bearing 3a is arranged at the upper end of the bearing housing 4. The lower bearing 3b is arranged at the lower end of the bearing housing 4. The number and type of bearings 3 may be changed from the configuration of this embodiment.

<2.4 Bearing housing 4>
Next, details of the bearing housing 4 will be described. As shown in FIGS. 2 and 3, the bearing housing 4 includes an inner tubular portion 41, an outer tubular portion 42, and a connecting portion 43. The inner tubular portion 41 is a tubular body extending along the central axis C1. The outer ring 31 of the bearing 3 is fixed inside the inner tubular portion 41. The outer ring 31 is fixed to the inner cylinder portion 41 by press fitting here. The method of fixing the outer ring 31 and the inner cylinder portion 41 is not limited to this. It may be fixed by a fixing method such as adhesion, welding or welding.

The stator 2 is fixed to the outer surface of the inner tubular portion 41. More specifically, the inner tubular portion 41 is inserted inside the annular core back portion 211. The outer surface of the inner tubular portion 41 contacts the core back portion 211, that is, the inner surface of the stator core 21, and holds the stator core 21. As a result, the stator 2 is fixed to the bearing housing 4.

The outer tubular portion 42 is located radially outward of the inner tubular portion 41. The outer cylinder portion 42 has a shape in which a part of a cylindrical shape extending in the axial direction is cut in the circumferential direction. That is, the outer tubular portion 42 has an arch shape having both ends in the circumferential direction when viewed from the axial direction.

The connecting portion 43 is disposed below the stator 2 and connects the inner tubular portion 41 and the outer tubular portion 42 in the radial direction. The bearing housing 4 of the present embodiment includes three connecting portions 43. The three connecting portions 43 are arranged at equal intervals in the circumferential direction. Two of the three connecting portions 43 connect both circumferential ends of the outer tubular portion 42 and the outer surface of the inner tubular portion 41.

In the motor 100 of this embodiment, the bearing housing 4 rotatably supports the shaft 11 of the rotor 1 via the upper bearing 3a and the lower bearing 3b. The stator 2 is fixed to the bearing housing 4. The shaft 11 is stably supported by disposing the upper bearing 3a and the lower bearing 3b apart from each other in the axial direction.

<2.5 Structure of Circuit Board 5>
A detailed configuration of the circuit board 5 will be described with reference to a new drawing. FIG. 4 is a bottom view of the circuit board 5. As shown in FIGS. 2 to 4, the circuit board 5 includes a wiring pattern 51, a through hole 52, a board recess 53, and a wiring cutout 54.

The circuit board 5 has a disk shape having irregularities in the radial direction. The through hole 52 is provided in the radial center portion of the circuit board 5 and penetrates the circuit board 5 in the axial direction. The inner cylindrical portion 41 of the bearing housing 4 penetrates through the through hole 52, and the outer surface of the inner cylindrical portion 41 contacts the inner surface of the through hole 52. As a result, the circuit board 5 is positioned with respect to the bearing housing 4 and held by the inner tubular portion 41. Further, the radial outer edge of the circuit board 5 is supported by the outer tubular portion 42 of the bearing housing 4.

That is, in the circuit board 5, the inner side surface of the through hole 52 is held by the inner tubular portion 41, and the radial outer edge is supported by the outer tubular portion 42. As a result, the circuit board 5 is held by the bearing housing 4. Furthermore, the circuit board 5 is arranged below the stator 2 of the bearing housing 4 in the axial direction. In other words, the circuit board 5 is arranged so as to axially face the lower surface of the stator 2 in the axial direction.

The substrate recess 53 has a recessed shape that is recessed radially outward from the inner surface of the through hole 52. That is, the circuit board 5 includes the board recess 53 that is recessed radially outward from the inner surface of the through hole 52. The lead wire 6 is arranged in the substrate recess 53. Details of the arrangement of the lead wires 6 will be described later. The wiring cutout portion 54 is a recessed portion that is recessed inward from the radial outer edge of the circuit board 5. As shown in FIG. 4, the wiring cutout portion 54 has a radially inner side bent in the circumferential direction. In the wiring cutout portion 54, the end portion 231 of the conducting wire wound around the tooth portion 212 is arranged. Then, the end portion 231 of the conductive wire is electrically connected to the wiring pattern 51 by soldering or the like.

The wiring pattern 51 is formed on the lower surface of the circuit board 5. The wiring pattern 51 is formed of a conductive metal film such as aluminum or copper. A wiring hole 511 penetrating the circuit board 5 is provided on the wiring pattern 51. A terminal portion 61 of the lead wire 6, which will be described later, penetrates through the wiring hole 511. The terminal portion 61 penetrating the wiring hole 511 is electrically connected to the wiring pattern 51. As a result, the wiring pattern 51 and the lead wire 6 (in other words, the circuit board 5 and the lead wire 6) are electrically connected. The wiring pattern 51 and the lead wires 6 (circuit board 5 and lead wires 6) are electrically connected by, for example, soldering. Further, the electrical connection is not limited to this, and a connection method capable of electrically connecting the wiring pattern 51 and the lead wire 6 (the circuit board 5 and the lead wire 6), such as adhesion with a conductive adhesive, may be used. Can be widely adopted. A portion where the terminal portion 61 and the wiring pattern 51 are electrically connected is a soldering portion 512. Note that the wiring hole 511 may be a recessed portion that is recessed inward from the radial outer edge of the circuit board 5 like the wiring cutout portion 54.

As shown in FIGS. 3 and 4, the three wiring holes 511 are arranged in the circuit board 5 in a direction intersecting the radial direction, for example, in the circumferential direction.

<2.6 Configuration of Lead Wire 6>
The lead wire 6 is an electric wire in which a conductive core wire is covered with a coating formed of resin or the like. The lead wire 6 connects, for example, an external device such as a power supply device and a control device to the circuit board 5, and supplies electric power, a control signal, and the like to the circuit board 5. The lead wire 6 includes a terminal portion 61 and an extending portion 62.

The lead wire 6 supplies a current to each of the windings 23 of three systems, for example. Therefore, the motor 100 is provided with the three lead wires 6. All of the three lead wires 6 penetrate the through hole 52 from the lower side to the upper side in the axial direction. That is, the bearing housing 4 and the lead wire 6 are passed through the through hole 52.

The lead wire 6 is passed through a through hole 52 through which the bearing housing 4 passes. As a result, it is possible to omit the holes and the like used only for passing the lead wires 6 of the circuit board 5. Therefore, the configuration of the circuit board 5 can be simplified, and the manufacturing cost for manufacturing the circuit board 5 can be suppressed. Further, as compared with the case where a hole, a notch or the like for passing the lead wire 6 is formed, the degree of freedom in designing the wiring pattern 51 on the surface of the circuit board 5 and the strength of the circuit board 5 can be increased.

Further, the outer diameter of the bearing housing 4 is larger than the outer diameter of the lead wire 6. Therefore, the inner diameter of the through hole 52 through which the bearing housing 4 penetrates is larger than the outer diameter of the lead wire 6. Accordingly, the work of passing the lead wire 6 through the through hole 52 can be simplified. Further, since the lead wire 6 passes between the inner edge of the through hole 52 and the outer surface of the bearing housing 4, the lead wire 6 is hard to move even if the lead wire 6 is pulled, and the disconnection of the soldering portion 512 is suppressed. ..

As shown in FIG. 2, the outer surface of the bearing housing 4 contacts the inner surface of the through hole 52. As a result, the circuit board 5 is positioned with respect to the bearing housing 4. That is, at least a part of the bearing housing 4 contacts the inner surface of the through hole 52. By positioning the circuit board 5 with respect to the bearing housing 4, the lead wires 6 can be stably held by the bearing housing 4 and the circuit board 5. As a result, disconnection between the lead wire 6 and the soldering portion 512 can be further suppressed.

As shown in FIGS. 2 and 3, all of the three lead wires 6 pass through the substrate recess 53 that is recessed radially outward from the inner surface of the through hole 52. That is, the lead wire 6 is arranged in the substrate recess 53 of the through hole 52. By disposing the three lead wires 6 in the substrate recess 53, the lead wires 6 are held in the circumferential direction. Thereby, even if a circumferential force acts on the lead wire 6, the force acting on the soldering portion 512 can be reduced. Accordingly, it is possible to further suppress the disconnection between the terminal portion 61 of the lead wire 6 and the wiring pattern 51 in the soldering portion 512. In the present embodiment, a plurality of (here, three) lead wires 6 are arranged in one substrate recess 53, but the present invention is not limited to this, and a plurality of substrate recesses 53 are provided, You may arrange|position the some lead wire 6 separately.

As shown in FIGS. 2 and 3, the extending portion 62 extends radially outward along the upper surface of the circuit board 5. That is, a part of the lead wire 6 includes the extending portion 62 extending along the upper surface of the circuit board 5. The extending portion 62 is axially held by the circuit board 5 and the stator 2.

Since the extending portion 62 is configured to be held by the circuit board 5 and the stator 2, the lead wire 6 can be firmly held. Further, since the extended portion 62 of the lead wire 6 is firmly held, even if a force acts on the lead wire 6, it is difficult for the force to act on the soldering portion 512. As a result, disconnection between the wiring pattern 51 and the terminal portion 61 in the soldering portion 512 is less likely to occur.

More specifically, when the circuit board 5 and the stator 2 are attached to the bearing housing 4, the extending portion 62 is sandwiched between the lower end of the winding wire 23 protruding downward in the axial direction of the stator 2 and the upper surface of the circuit board 5. .. That is, the extending portion 62 is axially held by the circuit board 5 and the winding wire 23 provided on the stator 2. In this way, the extension portion 62 is held by the winding wire 23 and the circuit board 5. Since the extending portion 62 is pressed by the portion protruding downward in the axial direction of the stator 2, the lead wire 6 can be held more firmly.

The core wire of the terminal portion 61 is exposed at the end of the extension portion 62. The terminal portion 61 penetrates the wiring hole 511 from the upper surface to the lower surface of the circuit board 5. The terminal portion 61 is electrically connected to the wiring pattern 51 formed on the lower surface of the circuit board 5 by soldering or the like. That is, the end portion of the extending portion 62 includes the terminal portion 61 extending to the lower surface of the circuit board 5, and the terminal portion 61 is soldered to the lower surface of the circuit board 5.

The terminal portion 61 of the lead wire 6 penetrates the wiring hole 511 and is electrically connected to the wiring pattern 51. Further, the end portion 231 of the lead wire of the winding wire 23 also penetrates the wiring cutout portion 54 in the axial direction and is electrically connected to the wiring pattern 51 by soldering or the like. Both the terminal portion 61 and the conductor wire at the end of the winding wire 23 penetrate the circuit board 5 from top to bottom. Therefore, the wiring pattern 51 is formed only on the lower surface of the circuit board 5. That is, the circuit board 5 can be a single-sided board, and the structure of the circuit board 5 can be simplified. Moreover, since the structure of the circuit board 5 can be simplified, the manufacturing cost can be reduced.

As shown in FIG. 3, the extending portions 62 of the three lead wires 6 extend from the substrate recess 53 to the wiring hole 511. Then, the terminal portions 61 of the three lead wires 6 respectively penetrate the three wiring holes 511 and are electrically connected to the wiring pattern 51. That is, in the circuit board 5, each of the plurality of lead wires 6 is electrically connected side by side in a direction intersecting the radial direction. Since the three wiring holes 511 are arranged side by side in the direction intersecting the radial direction, the extending portions 62 of the lead wires 6 do not intersect on the upper surface of the circuit board 5. Thereby, the three lead wires 6 can be more reliably held by the stator 2 and the circuit board 5, respectively.

<3. Structure of impeller 200>
As shown in FIG. 1, the impeller 200 includes an impeller hub 201 and a plurality of blades 202. The impeller 200 is a resin injection molded body. The impeller 200 is an axial fan that generates an air flow from above in the axial direction. The impeller hub 201 is fixed to the upper end of the shaft 11.

The plurality of blades 202 are arranged on the outer surface of the impeller hub 201. The plurality of blades 202 are arranged in the circumferential direction. In the blower device A of this embodiment, the blades 202 are arranged on the outer surface of the impeller hub 201 at equal intervals. The blade 202 is integrally molded with the impeller hub 201. The upper portion of the blade 202 is arranged forward of the lower portion in the rotational direction.

Since the blower device A is configured as described above, even if a force acts on the lead wire 6 due to vibration, impact, etc. due to driving of the blower device A, the lead wire 6 is disconnected at the soldering portion 512. Can be suppressed. Thereby, the malfunction of the blower A can be suppressed. Further, it is possible to drive the blower device A stably for a long period of time. Therefore, it is possible to employ the air blower A for a device such as an unmanned air vehicle in which external force is likely to act and/or a device with large vibration.

<4. First Modification>
A modified example of the motor according to the present embodiment will be described with reference to the drawings. FIG. 5 is a cross-sectional view of a motor 100b having another configuration according to this embodiment. FIG. 6 is a bottom view of the motor 100b shown in FIG. The motor 100b shown in FIGS. 5 and 6 has the same configuration as the motor 100 except that the bearing housing 4b and the circuit board 5b are different from the bearing housing 4 and the circuit board 5. Therefore, portions of the motor 100b that are substantially the same as those of the motor 100 are denoted by the same reference numerals, and detailed description of the same portions will be omitted.

As shown in FIGS. 5 and 6, the inner cylindrical portion 41b of the bearing housing 4b includes a housing recess 44 that is recessed radially inward on the outer surface. When the circuit board 5b is attached to the bearing housing 4b, the axially intermediate portion of the housing recess 44 overlaps the circuit board 5b in the radial direction.

That is, a part of the outer surface of the bearing housing 4b that overlaps the inner surface of the through hole 52b in the radial direction is provided with the housing recess 44 that is recessed radially inward. The lead wire 6 is arranged in the housing recess 44.

With this configuration, the lead wire 6 is arranged in the housing recess 44, and the lead wire 6 is held by the bearing housing 4b. Thereby, it is possible to hold the lead wire 6 also in the circumferential direction. Further, the circuit board 5b does not need to be provided with holes or notches, so that the circuit board can be prevented from being deformed or damaged. Furthermore, since the circuit board 5b does not require holes or notches, it is possible to increase the degree of freedom of the wiring pattern 51.

In this example, the circuit board 5b having a circular through hole as viewed in the axial direction is used, but the circuit board 5b is not limited to this. For example, the circuit board 5 may be configured to include the board recess 53. In this case, the board recess 53 provided in the circuit board 5 can be made small, the strength of the circuit board 5 can be increased, and deformation, damage, etc. can be suppressed. Further, since the board recess 53 of the circuit board can be made small, it is possible to increase the degree of freedom of the wiring pattern.

<5. Second Modification>
A modified example of the motor according to the present embodiment will be described with reference to the drawings. FIG. 7 is a sectional view of a motor 100c having another configuration according to this embodiment. The motor 100c shown in FIG. 7 has the same configuration as the motor 100 except that the configuration of the stator 2c is different from that of the stator 2. Therefore, portions of the motor 100c that are substantially the same as those of the motor 100 are denoted by the same reference numerals, and detailed description of the same portions will be omitted.

As shown in FIG. 7, the stator 2c includes an insulator 24 that surrounds at least a part of the tooth portion 212. The insulating coating 22 may be omitted in the stator 2c. The insulator 24 is a resin molded product. In the stator 2c, the winding wire 23 is formed by winding a conductive wire around the teeth portion 212 to which the insulator 24 is attached.

The lead wire 6 is pressed by the portion of the insulator 24 that projects to the lower end in the axial direction of the stator 2c. That is, the extending portion 62 is axially held by the circuit board 5 and the insulator 24 provided on the stator 2c. Since the insulator 24 has less variation in shape than the winding wire 23, the lead wire 6 can be held more accurately.

<6. Third Modification>
A modified example of the motor according to the present embodiment will be described with reference to the drawings. FIG. 8 is a cross-sectional view of a motor 100d having another configuration according to this embodiment. A motor 100d shown in FIG. 8 has the same configuration as the motor 100, except that the protective member 7 is arranged below the stator 2 in the axial direction. Therefore, substantially the same parts as the motor 100d of the motor 100d are denoted by the same reference numerals, and detailed description of the same parts is omitted.

In the motor 100d, the protection member 7 is arranged between the winding wire 23 and the circuit board 5. Then, the extending portion 62 contacts the protection member 7 and the circuit board 5. Since the protective member 7 is arranged between the winding wire 23 and the circuit board 5, damage to the winding wire 23 and the lead wire 6 due to direct contact with each other can be suppressed. Examples of the protective member 7 include a sheet such as an adhesive tape and an insulating material using a resin such as an adhesive. By using an insulating member as the protection member 7, the winding wire 23 and the lead wire 6 can be more reliably insulated. Further, by using an adhesive tape, an adhesive or the like as the protective member 7, the lead wire 6 can be held more reliably.

<7. Fourth Modification>
A modified example of the motor according to the present embodiment will be described with reference to the drawings. FIG. 9 is a cross-sectional view of a motor 100e having another configuration according to this embodiment. The motor 100e shown in FIG. 9 has the same configuration as the motor 100 except that the lower lead portion 63 arranged below the circuit board 5 of the lead wire 6e is different. Therefore, the substantially same parts of the motor 100e as the motor 100 are denoted by the same reference numerals, and detailed description of the same parts will be omitted.

As shown in FIG. 9, in the motor 100e, the lower lead portion 63 of the lead wire 6e extends radially outward along the lower surface of the circuit board 5. That is, the lead wire 6e extends radially outward along the lower surface of the circuit board 5. As a result, the extending portion 62 of the lead wire 6e extends above the circuit board 5 along the circuit board 5 and radially outward. The lower lead portion 63 of the lead wire 6e extends radially outward along the lower surface of the circuit board 5. Therefore, the lead wire 6e is held by at least a part of the circuit board 5 or the bearing housing 4. Thereby, the lead wire 6e is held more stably.

Further, the motor according to the present invention can be widely adopted not only as a blower device but also as a power source for rotating a rotating body.

Although the embodiment of the present invention has been described above, the present invention is not limited to this content. The embodiments of the present invention can be modified in various ways without departing from the spirit of the invention.

The blower of the present invention can be used, for example, as a power source for an unmanned air vehicle. In addition to this, it can be widely adopted in devices using an air flow that generates an axial flow. Further, the motor of the present invention can be used as a power source for supplying a rotational force to the outside, in addition to the blower.

A blower C1 central shaft 100 motor 100b motor 100c motor 100d motor 100e motor 1 rotor 11 shaft 12 rotor housing 121 rotor lid 122 rotor cylinder 123 shaft hole 13 rotor magnet 2 stator 21 stator core 211 core back 212 212 teeth 22 Painting 23 Winding 231 End 2c Stator 24 Insulator 3 Bearing 3a Upper bearing 3b Lower bearing 31 Outer ring 32 Inner ring 33 Ball 4 Bearing housing 41 Inner cylinder 42 Outer cylinder 43 Connection part 4b Bearing housing 41b Inner cylinder 44 Housing recess 5 Circuit board 51 Wiring pattern 511 Wiring hole 512 Soldering part 52 Through hole 53 Substrate recess 54 Wiring notch 5b Circuit board 52b Through hole 6 Lead wire 61 Terminal part 62 Extension part 6e Lead wire 63 Lower lead part 7 Protective member 200 Impeller 201 impeller hub 202 blades

Claims (12)

A rotor having a shaft extending vertically along the central axis,
A stator that faces the rotor in a radial direction,
A bearing that rotatably supports the shaft,
A bearing housing holding the bearing and the stator;
A circuit board having a through hole arranged axially below the stator and penetrating in the axial direction;
A plurality of lead wires electrically connected to the circuit board,
A motor in which the bearing housing and the lead wire are passed through the through hole. The motor according to claim 1, wherein at least a part of the bearing housing contacts an inner surface of the through hole. The circuit board is provided with a board recess that is recessed radially outward from the inner surface of the through hole,
The motor according to claim 1 or 2, wherein the lead wire is disposed in the concave portion of the substrate. The outer surface of the bearing housing that radially overlaps with the inner surface of the through hole is provided with a housing recess that is recessed radially inward.
The motor according to claim 1, wherein the lead wire is disposed in the housing recess. A part of the lead wire includes an extension portion extending along an upper surface of the circuit board,
The motor according to any one of claims 1 to 4, wherein the extending portion is sandwiched and fixed in the axial direction by the circuit board and the stator. The end portion of the extending portion includes a terminal portion that extends to the lower surface of the circuit board,
The motor according to claim 5, wherein the terminal portion is electrically connected to a lower surface of the circuit board. The motor according to claim 5 or 6, wherein the extending portion is axially held by the circuit board and an insulator provided on the stator. The motor according to claim 5 or 6, wherein the extending portion is axially held by the circuit board and a winding provided on the stator. Further comprising a protective member arranged between the winding and the circuit board,
The motor according to claim 8, wherein the extending portion contacts the protection member and the circuit board. The motor according to claim 6, wherein the lead wire extends radially outward along a lower surface of the circuit board. The motor according to any one of claims 1 to 10, wherein each of the plurality of lead wires is electrically connected to the circuit board side by side in a direction intersecting a radial direction. A motor according to any one of claims 1 to 11,
An impeller fixed to the rotor and rotating together with the rotor,
Blower.

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