JP2023060961A - Motor and axial flow fan - Google Patents

Abstract

To provide a motor capable of facilitating a fixing work of a lead wire to a radial outer side surface of a housing.SOLUTION: A motor comprises a rotor, a stator, a lead wire 20, and a housing covering the rotor and the stator from the outward in a radial direction. The housing comprises: a first housing located at one side in an axial direction; and a second housing located at the other side in the axial direction. The first housing has a convex part 410 protruded toward the other side in the axial direction. The second housing has a recessed part 510 recessed toward the other side in the axial direction and penetrating in the radial direction. The convex part is arranged at the recessed part. The convex part has a front end face 411 facing the other side in the axial direction. The recessed part has a bottom face 511 facing the one side in the axial direction. The lead wire is arranged between the front end face and the bottom face when seen from the radial direction. At least a part of the front end face is arranged at a position shifted in the radial direction from a position opposed to the bottom face in the axial direction.SELECTED DRAWING: Figure 5

Description

The present invention relates to motors and axial fans.

A conventional motor comprises a housing. The housing is composed of a first housing and a second housing. The first housing and the second housing are axially superimposed on each other. Lead wires of the motor are pulled out radially outward of the housings from between the first housing and the second housing (see, for example, Patent Document 1).

JP 2020-105974 A

In the conventional motor described above, the lead wires are sandwiched between the first housing and the second housing. Therefore, the lead wire can be held so that the position of the lead wire does not shift. However, since a load is applied to the lead wire between the first housing and the second housing, it may be difficult to fix the lead wire when performing work to fix the lead wire to the radial outer surface of the housing.

SUMMARY OF THE INVENTION An object of the present invention is to facilitate the work of fixing lead wires to the radially outer surface of a housing.

An exemplary motor of the present invention includes a rotor rotatable in a circumferential direction about a vertically extending central axis, a stator for rotating the rotor, lead wires electrically connected to the stator, the rotor and the stator. a housing covering from the radially outer side. The housing includes a first housing located on one side in the axial direction and a second housing located on the other side in the axial direction. The first housing has a convex portion that protrudes toward the other side in the axial direction, and the second housing has a concave portion that is recessed toward the other side in the axial direction and penetrates in the radial direction. The protrusion is arranged in the recess. The projection has a tip surface facing the other side in the axial direction. The recess has a bottom surface facing one side in the axial direction. The lead wire is arranged between the tip surface and the bottom surface when viewed from the radial direction. At least part of the tip surface is arranged at a position radially displaced from a position axially facing the bottom surface.

Further, an exemplary motor of the present invention includes a rotor rotatable in a circumferential direction around a vertically extending central axis, a stator for rotating the rotor, lead wires electrically connected to the stator, a rotor and a housing that radially covers the stator from the outside. The housing includes a first housing located on one side in the axial direction and a second housing located on the other side in the axial direction. The first housing has a convex portion that protrudes toward the other side in the axial direction, and the second housing has a concave portion that is recessed toward the other side in the axial direction and penetrates in the radial direction. The protrusion is arranged in the recess. The projection has a tip surface facing the other side in the axial direction. The recess has a bottom surface facing one side in the axial direction. The lead wire is arranged between the tip surface and the bottom surface when viewed from the radial direction. The lead wires are drawn out radially outward from the radially inner side of the housing. Lead wires drawn out from the housing are arranged on the radially outer surface of the housing. The housing has a lead wire holding portion. The lead wire pressing portion is provided on at least one of the first housing and the second housing, and is arranged radially outward of the lead wire pulled out from the housing. One end in the circumferential direction of the lead wire holding portion is a free end that is spaced apart in the radial direction with respect to the radial outer surface of the housing, and the other end in the circumferential direction is a fixed end connected to the radially outer surface of the housing. A portion of the free end slopes toward the fixed end when viewed in the radial direction.

An exemplary axial fan of the present invention comprises the motor described above and blades attached to the rotor.

According to the exemplary motor and axial fan of the present invention, it is possible to facilitate fixing of the lead wires to the radially outer surface of the housing.

FIG. 1 is a perspective view of an axial fan according to an embodiment. FIG. 2 is an exploded perspective view of the axial fan according to the embodiment. FIG. 3 is an exploded perspective view of the housing according to the embodiment. FIG. 4 is a schematic diagram of a lead wire passage portion according to the embodiment. FIG. 5 is a schematic diagram showing the positional relationship between the radially inner surface of the second housing and the convex portion according to the embodiment. FIG. 6 is a schematic diagram showing the positional relationship between the radial inner surface of the second housing and the convex portion according to the modification. FIG. 7 is an axial plan view of the second housing according to the embodiment. FIG. 8 is an enlarged cross-sectional view taken along a plane perpendicular to the axial direction of the protrusions, recesses, and their periphery according to the embodiment.

Exemplary embodiments of the invention are described below with reference to the drawings.

In this specification, the direction in which the central axis CA of the motor 100 extends is called the "axial direction", and the axial direction is the vertical direction. However, this definition of the vertical direction does not limit the orientation and positional relationship when the motor 100 is in use.

Also, in this specification, one axial direction is referred to as "upward" and the other axial direction is referred to as "downward." Moreover, in each component, the end face facing upward of the upper end is called "upper end face", and the end face of the lower end facing downward is called "lower end face".

Also, in this specification, the direction orthogonal to the central axis CA is called the "radial direction". Moreover, in the radial direction, the direction approaching the central axis CA is called "radially inward", and the direction away from the central axis CA is called "radial outward". In addition, in each component, the side surface facing radially inward is referred to as a "radial inner surface", and the side surface facing radially outward is referred to as a "radial outer surface".

Moreover, in this specification, the circumferential direction around the central axis CA is referred to as the "circumferential direction".

<1. Axial fan>
FIG. 1 is a perspective view of an axial fan 200 according to an embodiment. FIG. 2 is an exploded perspective view of the axial fan 200 according to the embodiment.

Axial fan 200 generates airflow. Axial fan 200 includes motor 100 and rotor blades 210 . Motor 100 is of the outer rotor type. The rotor blades 210 are attached to the motor 100 . Specifically, the rotor blades 210 are attached to the rotor 1, which will be described later. The motor 100 rotates the rotor blades 210 . An airflow is generated by rotating the moving blades 210 .

<2. Motor>
A motor 100 includes a rotor 1 , a stator 2 and a housing 3 . The motor 100 also has a shaft 10 .

The shaft 10 is arranged along a vertically extending central axis CA. Shaft 10 is supported by shaft holder 110 . The shaft holder 110 extends cylindrically in the axial direction along the central axis CA. A bearing (not shown) that rotatably supports the shaft 10 is attached to the radial inner surface of the shaft holder 110 .

The rotor 1 is rotatable in a circumferential direction around a vertically extending central axis CA. The rotor 1 has a covered tubular yoke 11 . A yoke lid portion 111, which is a lid portion of the yoke 11, has a disc shape centered on the central axis CA. The yoke lid portion 111 has an opening in the center in the radial direction. The shaft 10 is fixed to the radial inner surface of the opening of the yoke lid portion 111 . A yoke tubular portion 112 , which is the tubular portion of the yoke 11 , extends downward from the radial outer edge of the yoke lid portion 111 . A magnet (not shown) is fixed to the radial inner surface of the yoke tube portion 112 .

Stator 2 rotates rotor 1 . The stator 2 has an annular shape centered on a vertically extending central axis CA, and is arranged radially inward of the rotor 1 . A radially outer surface of the stator 2 faces a radially inner surface of the rotor 1 . Specifically, the radial outer surface of the stator 2 faces the magnet fixed to the radial inner surface of the yoke 11 . A radial inner surface of the stator 2 is fixed to a radial outer surface of the shaft holder 110 .

Stator 2 has stator core 21 , insulator 22 , coil 23 , and circuit board 24 . The stator core 21 is an annular magnetic body centered on the central axis CA, and is a laminated body in which a plurality of plate-like electromagnetic steel plates are laminated in the axial direction. A radial outer surface of the stator core 21 radially faces the magnet. A radial inner surface of the stator core 21 is fixed to a radial outer surface of the shaft holder 110 .

Insulator 22 covers at least part of stator core 21 . The insulator 22 is an insulating member using resin or the like. Coil 23 is formed by winding a conductive wire around stator core 21 via insulator 22 . Circuit board 24 is electrically connected to coil 23 . Various electronic components are mounted on the circuit board 24 .

The housing 3 radially covers the rotor 1 and the stator 2 . Further, the housing 3 radially outwardly covers the moving blades 210 attached to the rotor 1 .

Note that the motor 100 includes a lead wire 20 (see FIG. 4). Lead wires 20 are electrically connected to stator 2 . Specifically, a plurality of lead wires 20 are connected to the circuit board 24 . The lead wire 20 is pulled out from the inside of the motor 100 to the outside. That is, the lead wire 20 is pulled out radially outward from the radially inner side of the housing 3 .

<3. Configuration of Housing>
FIG. 3 is an exploded perspective view of the housing according to the embodiment.

The housing 3 has a first housing 4 and a second housing 5 . The first housing 4 is located on one side in the axial direction. The second housing 5 is located on the other side in the axial direction. That is, the first housing 4 is positioned on the upper side. The second housing 5 is located on the lower side. The first housing 4 and the second housing 5 are axially joined together.

The housing 3 has a cylindrical portion 300 centered on the central axis CA. The tubular portion 300 radially covers the rotor 1 and the stator 2 .

The first housing 4 has a first tubular portion 400 which is a portion of the tubular portion 300 on one side in the axial direction. The second housing 5 has a second tubular portion 500 which is the portion of the tubular portion 300 on the other side in the axial direction. The first tubular portion 400 and the second tubular portion 500 are joined together in the axial direction.

A moving blade 210 is attached to the rotor 1 . Therefore, the moving blade 210 is covered with the cylindrical portion 300 from the radially outer side. The cylindrical portion 300 axially guides the airflow generated by the rotation of the rotor blades 210 .

The second housing 5 holds the shaft holder 110 . In other words, the second housing 5 holds the stator 2 . Specifically, the second housing 5 has a base portion 501 that holds the stator 2 . For example, the base portion 501 is the same member as the second housing 5 and is formed integrally with the second housing 5 .

<4. Lead wire holding structure by housing>
FIG. 4 is a schematic diagram of the lead wire passage portion 310 according to the embodiment. FIG. 5 is a schematic diagram showing the positional relationship between the radially inner side surface 5a of the second housing 5 and the convex portion 410 according to the embodiment. FIG. 6 is a schematic diagram showing the positional relationship between the radial inner surface 5a of the second housing 5 and the protrusion 410 according to the modification. 5 and 6 are cross-sectional views taken along line AA' in FIG. 5 and 6, the left side of the drawing is the radially inner side, and the right side of the drawing is the radially outer side. FIG. 7 is an axial plan view of the second housing 5 according to the embodiment. FIG. 8 is an enlarged cross-sectional view of the convex portion 410, the concave portion 510, and their surroundings according to the embodiment, taken along a plane perpendicular to the axial direction.

<4-1. Lead wire passage>
The housing 3 has a lead wire passage portion 310 . The lead wire passage portion 310 is a through hole penetrating the housing 3 in the radial direction. The lead wire 20 is passed through the through hole of the lead wire passing portion 310 . In other words, the lead wire 20 is arranged in the lead wire passing portion 310 . The lead wire 20 is pulled out from the radially inner side of the housing 3 to the radially outer side through the lead wire passing portion 310 . The lead wire passage portion 310 is configured by the first housing 4 and the second housing 5 .

Specifically, the first housing 4 has a convex portion 410 that protrudes toward the other side in the axial direction. The convex portion 410 is a portion that protrudes downward from the lower end surface of the first tubular portion 400 . The convex portion 410 has a tip surface 411 facing the other side in the axial direction. The tip surface 411 is the lower end surface of the protrusion 410 .

The second housing 5 also has a recess 510 that is recessed toward the other side in the axial direction and penetrates in the radial direction. Specifically, the recessed portion 510 is recessed from the end surface of the second cylindrical portion 500 on one side in the axial direction toward the other side in the axial direction. That is, the recessed portion 510 is a portion recessed downward from the upper end surface of the second tubular portion 500 . The recess 510 has a bottom surface 511 facing one side in the axial direction. The convex portion 410 is arranged in the concave portion 510 .

The lead wire passage portion 310 is composed of the convex portion 410 and the concave portion 510 . In other words, the through hole of the lead wire passing portion 310 is configured by a gap generated between the tip surface 411 and the bottom surface 511 in the axial direction when viewed from the radial direction. The lead wire 20 is arranged between the tip surface 411 and the bottom surface 511 when viewed from the radial direction. The lead wire 20 is pulled out radially outward from the radially inner side of the housing 3 through an axial gap between the tip surface 411 and the bottom surface 511 .

Here, the convex portion 410 is arranged in the concave portion 510 . However, at least part of the tip surface 411 does not axially face the bottom surface 511 . That is, at least a part of the tip surface 411 is arranged at a position radially displaced from a position axially facing the bottom surface 511 . In this configuration, at least a part of the lead wire 20 that is arranged in the lead wire passing portion 310 is less restrained in the axial direction.

As a result, it is possible to prevent an excessive load from being applied to the lead wires 20 drawn out from the radially inner side of the housing 3 to the radially outer side. As a result, the lead wire 20 can be easily pulled out from the housing 3 and laid on the radial outer surface of the housing 3 . That is, the lead wires 20 drawn out from the housing 3 can be easily fixed to the radial outer surface of the housing 3 .

Further, the recessed portion 510 has a notch portion 511a on the bottom surface 511 thereof. A notch portion 511 a of the recess 510 penetrates in the axial direction and is recessed radially outward from the radial inner surface of the second housing 5 . Specifically, the notch portion 511a of the recessed portion 510 is recessed radially outward from the radial inner surface of the second tubular portion 500 . That is, the concave portion 510 has a region where the bottom surface 511 exists and a region where the bottom surface 511 is missing when viewed from the axial direction. A region in which the bottom surface 511 of the concave portion 510 is missing is a notch portion 511a.

At least part of the tip surface 411 is arranged at a position facing the notch 511a of the recess 510 in the axial direction. That is, at least part of the tip surface 411 does not face the bottom surface 511 . As a result, at least part of the tip surface 411 can be easily arranged at a position radially displaced from a position axially facing the bottom surface 511 .

For example, the entire tip surface 411 is arranged at a position facing the notch 511a of the recess 510 in the axial direction. That is, the tip surface 411 does not axially face the bottom surface 511 over the entire surface. With this configuration, it is possible to further suppress an excessive load from being applied to the lead wires 20 drawn out from the housing 3 .

A portion of the tip surface 411 may be arranged to face the bottom surface 511 in the axial direction. That is, a portion of the tip surface 411 may face the bottom surface 511 in the axial direction, and the other portion may face the notch 511 a of the recess 510 in the axial direction.

In the configuration of the embodiment shown in FIG. 5 , the radially inward facing surface 410 a of the projection 410 is flush with the radially inner side surface 5 a of the second housing 5 . As a result, no step occurs on the radially inner side surface of the housing 3 , so that it is possible to prevent the airflow from becoming unstable radially inwardly of the housing 3 . As a result, the blowing efficiency of the axial fan 200 is improved. In addition, it is possible to prevent the convex portion 410 from contacting the moving blade 210 .

As a modified example, the configuration shown in FIG. 6 can be adopted. In a modified example, the radially inward facing surface 410 a of the projection 410 is arranged radially outward from the radially inner side surface 5 a of the second housing 5 . In other words, the radially inward facing surface 410 a of the projection 410 may not be flush with the radially inner surface 5 a of the second housing 5 . In other words, the radially inward facing surface 410 a of the protrusion 410 should not protrude radially inward beyond the radially inner surface 5 a of the second housing 5 .

In the modified example, a step occurs on the radially inner surface of the housing 3 . However, since the protrusions 410 do not protrude radially inward from the radially inner side surface 5 a of the second housing 5 , the protrusions 410 can be prevented from coming into contact with the rotor blades 210 .

When the notch portion 511 a of the recess 510 and the tip end surface 411 are opposed to each other in the axial direction so that the tip end surface 411 is radially displaced from the bottom surface 511 , the larger the radial thickness of the projection 410 , the more the recess 510 is formed. It is necessary to increase the radial width of the notch portion 511a. In other words, it is necessary to reduce the radial width of the bottom surface 511 as the radial thickness of the protrusion 410 increases. However, if the radial width of the bottom surface 511 is small, the strength of the portion of the second housing 5 surrounding the recess 510 is reduced.

Therefore, the radial thickness T of the convex portion 410 is less than half the radial opening width W of the concave portion 510 when viewed from the axial direction (see FIG. 8). This can prevent the radial width of the bottom surface 511 from becoming too small. As a result, it is possible to suppress a decrease in the strength of the portion of the second housing 5 surrounding the recess 510 .

3 and 4, the convex portion 410 has a first outer side surface 421 facing one side in the circumferential direction and a second outer side surface 422 facing the other side in the circumferential direction. The recess 510 has a first inner side surface 521 facing one side in the circumferential direction and a second inner side surface 522 facing the other side in the circumferential direction. The first outer surface 421 and the second inner surface 522 face each other in the circumferential direction. The second outer surface 422 and the first inner surface 521 face each other in the circumferential direction. The first outer surface 421 and the second inner surface 522 may at least partially contact each other. Also, the second outer surface 422 and the first inner surface 521 may contact each other at least partially.

In the operation of attaching the first housing 4 to the second housing 5 , the convex portion 410 is arranged from above with respect to the concave portion 510 . For example, the protrusion 410 is inserted into the recess 510 while being guided by the first inner side surface 521 and the second inner side surface 522 .

Here, the convex portion 410 has a tapered shape from one side to the other side in the axial direction when viewed from the radial direction. That is, of the protrusions 410, the tip portion, which is the portion on the lower side, has a smaller width in the circumferential direction than the root portion, which is the portion on the upper side.

Specifically, the first outer side surface 421 has a surface 4211 parallel to the axial direction on the upper side and an inclined surface 4212 inclined with respect to the axial direction on the lower side. In other words, the first outer side surface 421 has an inclined surface 4212 that inclines toward the other side in the circumferential direction toward the other side in the axial direction. On the other hand, the second outer surface 422 is a surface parallel to the axial direction.

By providing the inclined surface 4212 on the first outer side surface 421 of the projection 410 , the projection 410 has a tapered shape from one axial side to the other axial direction. During work, it becomes easier to insert the projection 410 into the recess 510 .

Further, by making the second outer side surface 422 of the protrusion 410 parallel to the axial direction, the protrusion 410 can be linearly guided in the axial direction when the protrusion 410 is inserted into the recess 510 . This facilitates the work of inserting the projection 410 into the recess 510 . In other words, the work of attaching the second housing 5 to the first housing 4 is facilitated.

<4-2. Lead wire retainer>
A lead wire 20 drawn out from the housing 3 is arranged along the radial outer surface of the housing 3 . Specifically, the lead wire 20 extends from the through hole of the lead wire through portion 310 to one side in the axial direction. That is, the lead wire 20 extends radially outward of the housing 3 from the second housing 5 toward the first housing 4 .

Further, the lead wire 20 is fixed to the radial outer surface of the housing 3 . In other words, the lead wire 20 is held so as not to be separated from the radial outer surface of the housing 3 .

Specifically, as shown in FIG. 1, the housing 3 has a lead wire pressing portion 320 . The lead wire pressing portion 320 is provided on at least one of the first housing 4 and the second housing 5 . The lead wire pressing portion 320 is arranged radially outward of the lead wire 20 pulled out from the housing 3 (see FIG. 8). In other words, at least part of the lead wire 20 is pressed radially inward from the radially outer side by the lead wire pressing portion 320 . Thereby, the lead wire 20 can be easily fixed to the radial outer surface of the housing 3 .

In this manner, the lead wire 20 is fixed to the radially outer surface of the housing 3 by being pressed by the lead wire pressing portion 320 on the radially outer side of the housing 3 . In this fixing method, it is necessary to insert the lead wire 20 between the radial outer surface of the housing 3 and the lead wire pressing portion 320 .

Therefore, one end in the circumferential direction of the lead wire holding portion 320 is a free end portion 321 that is spaced apart in the radial direction with respect to the radial outer surface of the housing 3 . is a fixed end 322 connected to the radial outer surface of the housing 3 (see FIG. 3). A portion of the free end portion 321 is circumferentially inclined with respect to the axial direction.

For example, the lead wire pressing portion 320 is the same member as the housing 3 and is formed integrally with the housing 3 . A fixed end 322 extends from a corner of the housing 3 . Then, the lead wire pressing portion 320 is elastically deformed in a direction away from and approaching the radial outer surface of the housing 3 with the fixed end portion 322 as a fulcrum.

With this configuration, when the lead wire 20 is fixed to the radial outer surface of the housing 3, the lead wire 20 can be inserted between the radial outer surface of the housing 3 and the lead wire pressing portion 320 from the free end portion 321 side. . At this time, since a portion of the free end portion 321 is inclined toward the fixed end portion 322, the lead wire 20 cannot be inserted between the radial outer surface of the housing 3 and the lead wire holding portion 320. work becomes easier.

Moreover, the radial outer surface of the housing 3 has a wiring portion 30 that is recessed radially inward. The recess forming the wiring portion 30 extends in the axial direction. That is, the housing 3 has grooves extending in the axial direction as the wiring portions 30 . The lead wire holding portion 320 is arranged at a position facing the wiring portion 30 in the radial direction. As a result, the distance between the radial outer surface of the housing 3 and the lead wire pressing portion 320 can be widened. As a result, the lead wire 20 can be easily arranged between the radial outer surface of the housing 3 and the lead wire pressing portion 320 .

The groove as the wiring portion 30 extends upward from the through hole of the lead wire passing portion 310 . In other words, the bottom surface of the groove as the wiring portion 30 is formed by a part of the radial outer surface of the first housing 4 and the radial outer surface of the protrusion 410 . In other words, the wiring portion 30 is provided on the radial outer surface of the first housing 4 .

And the wiring part 30 has the 1st wiring part 31 and the 2nd wiring part 32 with a larger radial thickness than the 1st wiring part 31 (refer FIG. 3). Further, the second wiring portion 32 is arranged on one side of the first wiring portion 31 in the axial direction. That is, in the first housing 4 , the upper side of the wiring portion 30 is thicker in the radial direction than the lower side of the wiring portion 30 .

With this configuration, even if the wiring portion 30 is provided in the first housing 4 , it is possible to prevent the upper end portion of the first housing 4 from having a thin portion. That is, it is possible to prevent a portion of the thickness of the outer edge of the intake/exhaust port from being thinned. Thereby, it is possible to suppress the occurrence of vibration during rotation of the moving blade 210 .

Here, the lead wire pressing portion 320 has a first lead wire pressing portion 420 and a second lead wire pressing portion 520 (see FIG. 3). The first lead wire holding portion 420 is provided on the first housing 4 . The second lead wire holding portion 520 is provided on the second housing 5 . Thereby, the lead wire 20 can be pressed on both the first housing 4 side and the second housing 5 side. Thereby, the lead wire 20 can be fixed.

In addition, the first lead wire holding portion 420 has a first inclined portion 4201 inclined toward the fixed end portion 322 side toward the other side in the axial direction when viewed from the radial direction, and the second lead wire holding portion 520 has a second inclined portion 5201 inclined toward the fixed end portion 322 toward one side in the axial direction when viewed from the radial direction. That is, both the free end portions 321 of the first lead wire holding portion 420 and the second lead wire holding portion 520 are inclined toward the fixed end portion 322 when viewed from the radial direction. As a result, even if the first lead wire holding portion 420 and the second lead wire holding portion 520 are provided in the first housing 4 and the second housing 5, respectively, the radial outer surface of the housing 3 and the lead wire holding portion 320 are not in contact with each other. The work of inserting the lead wire 20 into the space is facilitated.

Further, the first inclined portion 4201 is arranged on the other axial side of the first lead wire holding portion 420 , and the second inclined portion 5201 is arranged on the one axial side of the second lead wire holding portion 520 . (See FIG. 1). In this configuration, the lead wire holding portion 320 has a shape in which the substantially central portion in the axial direction is recessed in the circumferential direction when viewed from the radial direction. This makes it easier to insert the lead wire 20 from the substantially central portion of the lead wire holding portion 320 in the axial direction. In addition, the lead wire 20 can be pressed on the upper and lower portions of the lead wire pressing portion 320 .

Further, the first lead wire holding portion 420 and the second lead wire holding portion 520 are arranged continuously in the axial direction (see FIG. 1). For example, the lower end surface of the first lead wire holding portion 420 and the upper end surface of the second lead wire holding portion 520 may contact each other. Thereby, the lead wire 20 can be reliably fixed. Further, by making the first lead wire holding portion 420 and the second lead wire holding portion 520 continuous in the axial direction, the exposed portion of the lead wire 20 can be reduced. Therefore, it is possible to prevent the lead wire 20 from coming into contact with another member (not shown) arranged radially outward of the lead wire holding portion 320 . In other words, the lead wire 20 can be protected by the lead wire pressing portion 320 .

In addition, the circumferential width of the first lead wire holding portion 420 is larger than the circumferential width of the second lead wire holding portion 520 . That is, the circumferential width of the second lead wire pressing portion 520 is smaller than the circumferential width of the first lead wire pressing portion 420 . The circumferential width of the second lead wire holding portion 520 is the maximum circumferential width of the first lead wire holding portion, and the circumferential width of the second lead wire holding portion 520 is equal to the second lead wire holding portion. It is the maximum width of the portion 520 in the circumferential direction.

In fixing the lead wire 20 to the radial outer surface of the housing 3 , the lead wire 20 is pulled out from the second housing 5 side. In this case, if the width of the second lead wire holding portion 520 in the circumferential direction is small, the lead wire 20 can be easily laid on the radial outer surface of the housing 3 . In addition, since the first lead wire holding portion 420 has a large circumferential width, even if the second lead wire holding portion 520 has a small circumferential width, the first lead wire holding portion 420 can reliably hold the lead wire 20. can be fixed.

<4-3. Regulatory Department>
The recessed portion 510 has a restricting portion 530 (see FIGS. 7 and 8). The restricting portion 530 protrudes in the circumferential direction. The restricting portion 530 is provided on at least one of the first inner side surface 521 and the second inner side surface 522 . That is, at least one of the first inner side surface 521 and the second inner side surface 522 has a restriction portion 530 protruding in the circumferential direction. For example, restricting portion 530 is provided on both first inner side surface 521 and second inner side surface 522 . The restricting portion 530 of the first inner side surface 521 protrudes toward the second inner side surface 522 . A restriction portion 530 on the second inner side surface 522 protrudes toward the first inner side surface 521 . That is, the restricting portion 530 is a protruding portion that protrudes in the circumferential direction from each of the first inner side surface 521 and the second inner side surface 522 .

The restricting portion 530 is arranged radially outward of the convex portion 410 and faces the convex portion 410 in the radial direction. Accordingly, even if the projection 410 is deformed radially outward, the radially outward deformation of the projection 410 is restricted by the restricting portion 530 . As a result, deformation of the first housing 4 can be suppressed. Note that the restricting portion 530 may come into contact with the convex portion 410 .

<5. Others>
The embodiments of the present invention have been described above. It should be noted that 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 gist of the invention. Further, the above-described embodiments can be combined arbitrarily as appropriate.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, as a motor for an axial fan.

REFERENCE SIGNS LIST 1 rotor 2 stator 3 housing 4 first housing 5 second housing 20 lead wire 30 wiring portion 31 first wiring portion 32 second wiring portion 100 motor 200 axial fan 210 rotor blade 300 cylindrical portion 320 lead wire holding portion 321 free end Part 322 Fixed end 400 First cylinder 410 Protrusion 411 Tip surface 420 First lead wire holding part 421 First outer surface 422 Second outer surface 500 Second cylinder 510 Recess 511 Bottom surface 511a Notch 520 Second lead Line pressing portion 521 First inner side surface 522 Second inner side surface 530 Regulating portion 4201 First inclined portion 5201 Second inclined portion CA Central axis

Claims (16)

a rotor rotatable in a circumferential direction around a vertically extending central axis;
a stator that rotates the rotor;
lead wires electrically connected to the stator;
a housing that radially covers the rotor and the stator;
The housing is
a first housing located on one side in the axial direction;
a second housing positioned on the other side in the axial direction;
the first housing has a projection projecting toward the other side in the axial direction,
the second housing is recessed toward the other side in the axial direction and has a recess penetrating in the radial direction;
The convex portion is arranged in the concave portion,
The convex portion has a tip surface facing the other side in the axial direction,
The recess has a bottom surface facing one side in the axial direction,
the lead wire is disposed between the tip surface and the bottom surface when viewed in the radial direction;
The motor, wherein at least part of the tip surface is arranged at a position shifted in the radial direction from a position facing the bottom surface in the axial direction. The recess has a notch on the bottom surface,
the notch penetrates in the axial direction and is recessed radially outward from the radially inner surface of the second housing;
2. The motor according to claim 1, wherein at least part of said tip surface is arranged at a position facing said notch in said axial direction. 3. The motor according to claim 2, wherein the radially inward facing surface of the projection is flush with the radially inner surface of the second housing. 3. The motor according to claim 2, wherein the radially inward facing surface of the protrusion is arranged radially outward of the radially inner surface of the second housing. The housing has a cylindrical portion centered on the central axis,
the cylindrical portion covers the rotor and the stator from the radially outer side;
The first housing has a first cylindrical portion that is a portion of the cylindrical portion on one side in the axial direction,
The second housing has a second cylindrical portion that is a portion of the cylindrical portion on the other side in the axial direction,
the recess is recessed from an end face on one side in the axial direction of the second tubular portion toward the other side in the axial direction;
the cutout portion is recessed radially outward from the radially inner surface of the second cylindrical portion;
The motor according to any one of claims 2 to 4, wherein the radial thickness of the projection is half or less of the radial opening width of the recess when viewed from the axial direction. The convex portion is
a first outer surface facing one side in the circumferential direction;
a second outer surface facing the other side in the circumferential direction,
The first outer surface has an inclined surface that inclines toward the other side in the circumferential direction toward the other side in the axial direction,
The motor according to any one of claims 1 to 5, wherein the second outer surface is a surface parallel to the axial direction. the lead wire is pulled out radially outward from the radially inner side of the housing;
the lead wire drawn out from the housing is arranged on the radial outer surface of the housing;
The housing has a lead wire holding portion,
The lead wire holding portion is
provided in at least one of the first housing and the second housing,
7. The motor according to any one of claims 1 to 6, arranged outside in the radial direction of the lead wires drawn out from the housing. One end in the circumferential direction of the lead wire holding portion is a free end portion spaced apart in the radial direction with respect to the radial outer surface of the housing. the other end is a fixed end connected to the radially outer surface of the housing;
8. The motor according to claim 7, wherein a portion of said free end is inclined in said circumferential direction with respect to said axial direction. The radially outer surface of the housing has a wiring portion that is recessed radially inward,
9. The motor according to claim 7, wherein said lead wire pressing portion is arranged at a position facing said wiring portion in said radial direction. The wiring portion is provided on a radial outer surface of the first housing,
The wiring part is
a first wiring portion;
a second wiring portion having a greater thickness in the radial direction than the first wiring portion;
10. The motor according to claim 9, wherein said second wiring portion is arranged on one side of said first wiring portion in said axial direction. The recess is
a first inner surface facing one side in the circumferential direction;
and a second inner surface facing the other side in the circumferential direction,
At least one of the first inner surface and the second inner surface has a restricting portion projecting in the circumferential direction,
The motor according to any one of claims 1 to 10, wherein the restricting portion is arranged radially outward of the projection and faces the projection in the radial direction. a rotor rotatable in a circumferential direction around a vertically extending central axis;
a stator that rotates the rotor;
lead wires electrically connected to the stator;
a housing that radially covers the rotor and the stator;
The housing is
a first housing located on one side in the axial direction;
a second housing positioned on the other side in the axial direction;
the first housing has a projection projecting toward the other side in the axial direction,
the second housing is recessed toward the other side in the axial direction and has a recess penetrating in the radial direction;
The convex portion is arranged in the concave portion,
The convex portion has a tip surface facing the other side in the axial direction,
The recess has a bottom surface facing one side in the axial direction,
the lead wire is disposed between the tip surface and the bottom surface when viewed in the radial direction;
the lead wire is pulled out radially outward from the radially inner side of the housing;
the lead wire drawn out from the housing is arranged on the radial outer surface of the housing;
The housing has a lead wire holding portion,
The lead wire holding portion is
provided in at least one of the first housing and the second housing,
arranged radially outward of the lead wire drawn out from the housing,
One end in the circumferential direction of the lead wire holding portion is a free end portion spaced apart in the radial direction with respect to the radial outer surface of the housing. the other end is a fixed end connected to the radially outer surface of the housing;
A motor, wherein a portion of the free end is inclined in the circumferential direction with respect to the axial direction. The lead wire holding portion is
a first lead wire pressing portion provided on the first housing;
a second lead wire pressing portion provided on the second housing;
The first lead wire holding portion has a first inclined portion inclined toward the fixed end portion side toward the other side in the axial direction when viewed from the radial direction,
The second lead wire holding portion has a second inclined portion inclined toward the fixed end portion side toward one side in the axial direction when viewed from the radial direction,
The first inclined portion is arranged on the other side of the first lead wire holding portion in the axial direction,
13. The motor according to claim 12, wherein said second inclined portion is arranged on one side of said second lead wire holding portion in said axial direction. 14. The motor according to claim 13, wherein said first lead wire holding portion and said second lead wire holding portion are arranged continuously in said axial direction. 15. The motor according to claim 13, wherein the circumferential width of the first lead wire pressing portion is greater than the circumferential width of the second lead wire pressing portion. a motor according to any one of claims 1 to 15;
and blades attached to the rotor.

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