CN212063691U - Motor and axial flow fan - Google Patents

Abstract

The utility model provides a motor, axial fan, motor have: a rotor that is rotatable about a central axis extending in a vertical direction; a stator driving the rotor; and a cylindrical 1 st housing extending in the axial direction, which covers a radially outer end portion of the stator. The insulating member of the stator has: a 1 st wall portion protruding upward from an upper end portion of the stator core and extending in a circumferential direction; and a 1 st recess which is provided at an upper end portion of the 1 st wall portion and is recessed downward. The 1 st housing has: a 1 st cylinder part extending in an axial direction; a 1 st cover portion that extends radially inward from an upper end portion of the 1 st tube portion; and a 1 st rib of a plate shape expanded in the axial direction and the radial direction. The 1 st rib is connected to at least one of a lower surface of the 1 st lid and a radially inner surface of the 1 st tube, and is disposed in the 1 st recess.

Description

Motor and axial flow fan

Technical Field

The utility model relates to a motor, axial fan.

Background

Conventionally, a motor in which a stator is mounted inside a housing is known. For example, in the rotary electric motor of patent document 1, an outer peripheral surface of an annular stator is fitted into an inner peripheral surface of a motor housing. A plurality of female screws are formed on the motor housing. The stator is fixed to the motor case by screwing a plurality of bolts passing through the stator into the respective internal threads.

Patent document 1: japanese patent laid-open publication No. 2019-17187

However, in patent document 1, before or after the step of housing the stator in the housing, it is necessary to perform positioning of the stator in the circumferential direction so that the bolt of the stator overlaps the female screw when viewed from the axial direction.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can fix a position motor, axial fan to the circumferential position of stator relative to the casing easily.

A first aspect of the present invention provides a motor, characterized in that: a rotor that is rotatable about a central axis extending in a vertical direction; a stator driving the rotor; and a cylindrical 1 st housing extending in the axial direction, which covers a radially outer end portion of the stator. The stator has: an annular stator core centered on the central axis; and an insulator covering at least a portion of the stator core. The insulating member has: a 1 st wall portion that protrudes upward from an upper end portion of the stator core and extends in a circumferential direction; and a 1 st recess which is provided at an upper end portion of the 1 st wall portion and is recessed downward. The 1 st housing has: a 1 st cylinder part extending in an axial direction; a 1 st lid portion that extends radially inward from an upper end portion of the 1 st tube portion; and a 1 st rib of a plate shape expanded in the axial direction and the radial direction. The 1 st rib is connected to at least one of a lower surface of the 1 st lid and a radially inner surface of the 1 st tube, and is disposed in the 1 st recess.

A second aspect of the present invention is the motor of the first aspect, wherein the stator core includes a plurality of core pieces arranged in a circumferential direction, the stator has a plurality of coil portions provided on the core pieces with the insulating member interposed therebetween, and when viewed from an axial direction, the 1 st concave portion is adjacent to the core pieces in the circumferential direction, and the 1 st rib is away from the coil portions.

A third aspect of the present invention is the motor of the second aspect, wherein the 1 st housing has a plurality of grooves recessed radially outward from a radially inner side surface and extending upward from a lower end of the 1 st housing, the stator core has a joint portion that is adjacent in the circumferential direction to the core pieces, and the groove portion and the circumferential position of the 1 st rib are the same as the circumferential position of the joint portion.

A motor according to a fourth aspect of the present invention is the motor according to the third aspect, wherein a radially outer end portion of the joint portion protrudes radially outward from a radially outer end portion between the core members adjacent in the circumferential direction, and is disposed in the groove portion.

A motor according to a fifth aspect of the present invention is the motor according to any one of the first to fourth aspects, wherein the 1 st rib is opposed to the 1 st recess portion in the axial direction with a space therebetween.

The motor of the sixth aspect of the present invention is characterized in that, in the motor of any one of the first to fourth aspects, the 1 st housing has a step portion extending in the circumferential direction on a radial inner side surface, the step portion includes: a 1 st inner surface facing radially inward and facing radially outward end portions of the stator cores; a 2 nd inner surface facing radially inward and located above the 1 st inner surface and radially inward; and a 3 rd inner side surface extending from an upper end portion of the 1 st inner side surface to a lower end portion of the 2 nd inner side surface, the 3 rd inner side surface facing downward and contacting an upper end portion of the stator core.

A seventh aspect of the present invention is the motor of any one of the first to fourth aspects, wherein the 1 st rib has a 1 st inclined surface, and the 1 st inclined surface is provided at a radially inner end portion of the 1 st rib, and extends radially inward from a lower end portion of the 1 st rib upward.

A motor according to an eighth aspect of the present invention is the motor according to the seventh aspect, wherein the insulator further has an inner wall portion protruding upward from the upper end portion of the stator core and extending in the circumferential direction, the inner wall portion is provided at a position closer to the radially inner side than the 1 st wall portion, the 1 st rib further has a recessed portion provided on the 1 st inclined surface, the recessed portion is recessed from at least any one of the upward and radially outer sides of the 1 st inclined surface, and overlaps with the inner wall portion when viewed from the axial direction.

A ninth aspect of the present invention is the motor of any one of the first to fourth aspects, further comprising a housing cover mounted to the lower end of the 1 st housing and covering the lower end of the 1 st housing, wherein the housing cover houses an axial lower portion of the stator, and the housing cover comprises: a 2 nd cylindrical portion extending in the axial direction and attached to a lower end portion of the 1 st cylindrical portion; a 2 nd lid portion that extends radially inward from a lower end portion of the 2 nd cylindrical portion; and a 2 nd rib of a plate shape expanded in the axial direction and the radial direction, the insulator having: a 2 nd wall portion protruding downward from a lower end portion of the stator core and extending in a circumferential direction; and a 2 nd recessed portion provided at a lower end portion of the 2 nd wall portion and recessed upward, wherein the 2 nd rib is connected to at least one of an upper surface of the 2 nd lid portion and a radial inner surface of the 2 nd cylindrical portion, and is disposed in the 2 nd recessed portion.

A motor according to a tenth aspect of the present invention is the motor of the ninth aspect, wherein the 2 nd rib has a 2 nd inclined surface, and the 2 nd inclined surface is provided at a radially inner end portion of the 2 nd rib and extends radially inward from an upper end portion of the 2 nd rib downward.

The eleventh mode of the present invention provides an axial fan, characterized in that, the axial fan has: the above-mentioned motor; and an impeller attached to a rotor of the motor. The motor further includes: a 2 nd housing which is formed in a tubular shape extending in an axial direction and is provided at a position radially outside the 1 st housing; and stationary blades connecting a radially outer side surface of the 1 st casing and a radially inner side surface of the 2 nd casing. The impeller includes a rotor blade rotatable together with the rotor about the central axis.

According to the utility model discloses a motor, axial fan can be fixed a position the circumference position of stator relative to the casing easily.

Drawings

Fig. 1 is a perspective view of an axial flow fan.

Fig. 2 is a sectional view showing a structural example of the axial flow fan.

Fig. 3 is a perspective view of an axially upper portion of the stator.

Fig. 4 is a perspective view of an axially lower portion of the stator.

Fig. 5 is a view showing a modification of the 1 st recess.

Fig. 6 is a view showing a modification of the 2 nd recess.

Fig. 7 is a sectional view of the housing.

Fig. 8 is a sectional view of the axial flow fan along a one-dot chain line a-a of fig. 2.

Fig. 9 is an enlarged cross-sectional view of the vicinity of the step portion.

Fig. 10 is a perspective view of the housing cover.

Fig. 11 is a sectional view of the axial flow fan along the two-dot chain line B-B of fig. 2.

Fig. 12 is an enlarged cross-sectional view of the vicinity of the cover step portion.

Description of the reference symbols

100: a motor; 1: a rotor; 10: a shaft; 11: a magnet; 12: a counterweight; 2: a stator; 21: a stator core; 210: a core member; 2101: a joint portion; 211: the back of the iron core; 212: a tooth portion; 22: an insulating member; 221: a 1 st wall part; 222: 1 st recess; 2221: 1, inner bottom surface; 223: 1 st inner wall part; 225: a 2 nd wall portion; 226: a 2 nd recess; 2261: 1, inner bottom surface; 227: a 2 nd inner wall portion; 23: a coil section; 3: a housing; 31: 1, a first shell; 311: a 1 st cylinder part; 3110: a step portion; 3111: medial side 1; 3112: a 2 nd medial side; 3113: a 3 rd medial side; 3115: a groove part; 312: a 1 st cover part; 3121: 1 st support part; 3122: 1 st opening; 313: the 1 st rib; 3131: the 1 st inclined plane; 3132: 1 st recess; 32: a 2 nd housing; 33: a stationary blade; 34: an inner cylinder part; 340: a 1 st bearing; 4: a housing cover; 41: a 2 nd cylindrical part; 410: a cover step portion; 411: the inner side of the No. 1 cover; 412: the inner side of the No. 2 cover; 413: a 3 rd cover inner side surface; 415: a cover groove part; 42: a 2 nd lid section; 421: an annular portion; 4211: a 2 nd bearing; 422: a 2 nd support part; 423: a 2 nd opening; 43: a 2 nd rib; 431: a 2 nd inclined surface; 432: a 2 nd recessed portion; 5: a substrate; 200: an impeller; 201: moving blades; 202: an impeller base; 500: an axial flow fan; CA: a central axis.

Detailed Description

Hereinafter, exemplary embodiments will be described with reference to the drawings.

In the present specification, the direction parallel to the center axis CA in the axial flow fan 500 and the motor 100 is referred to as an "axial direction". The direction from the casing cover 4 to the impeller 200 described later in the axial direction is referred to as "upward", and the direction from the impeller 200 to the casing cover 4 is referred to as "downward". In each component, an upper end is referred to as an "upper end", a position of the upper end in the axial direction is referred to as an "upper end", a lower end is referred to as a "lower end", a position of the lower end in the axial direction is referred to as a "lower end", and a surface facing upward among surfaces of the components is referred to as an "upper surface", and a surface facing downward is referred to as a "lower surface".

In addition, a direction perpendicular to the center axis CA is referred to as a "radial direction". The direction toward the center axis CA in the radial direction is referred to as "radially inner side", and the direction away from the center axis CA is referred to as "radially outer side". In each component, the inner end is referred to as a "radially inner end", and the position of the radially inner end is referred to as a "radially inner end". The outer end is referred to as a "radially outer end", the position of the radially outer end is referred to as a "radially outer end", and, among the side surfaces of the respective constituent elements, the side surface facing inward is referred to as a "radially inner side surface", and the side surface facing outward is referred to as a "radially outer side surface".

The rotational direction around the center axis CA is referred to as "circumferential direction". In each component, an end in the circumferential direction is referred to as a "circumferential end", and a position of the circumferential end in the circumferential direction is referred to as a "circumferential end". One circumferential end is referred to as a "circumferential end", and the position of the circumferential end is referred to as a "circumferential end". The other end in the circumferential direction is referred to as "the other end in the circumferential direction", and the position of the other end in the circumferential direction is referred to as "the other end in the circumferential direction". Among the side surfaces of the respective components, the side surface facing in the circumferential direction is referred to as a "circumferential side surface". The side surface facing in one circumferential direction is referred to as a "circumferential one-side surface", and the side surface facing in the other circumferential direction is referred to as a "circumferential other-side surface".

In the present specification, the "annular shape" includes a shape in which the entire circumference around the central axis CA is continuously connected without a slit, and also includes an arc shape having a slit in a part of the entire circumference around the central axis CA.

The above-described definitions of the direction, position, surface, and "ring" are not strictly applied when the device is incorporated into an actual apparatus.

< 1. embodiment >

Fig. 1 is a perspective view of an axial flow fan 500. Fig. 2 is a sectional view showing a configuration example of the axial flow fan 500. Fig. 2 shows a cross-sectional structure of the axial fan 500 cut by a virtual plane that includes the central axis CA and is parallel to the central axis CA.

< 1-1. Structure of axial flow fan

The axial fan 500 is a blower, and includes a motor 100 and an impeller 200. The motor 100 is a driving device that drives and rotates the impeller 200. The impeller 200 is an impeller attached to a rotor 1 of the motor 100, which will be described later. Impeller 200 includes a plurality of rotor blades 201 and a cover cylindrical impeller base 202. The plurality of rotor blades 201 are rotatable together with the rotor 1 about a central axis CA extending in the vertical direction, and extend radially outward from the wheel base 202. The rotor blade 201 is rotated about the central axis CA by driving of the motor 100, and sends an air flow downward.

< 1-2. Structure of motor

Next, the structure of the motor 100 will be explained. The motor 100 includes a rotor 1, a stator 2, a housing 3, a housing cover 4, and a substrate 5.

< 1-2-1. rotor >

The rotor 1 is rotatable about a central axis CA extending in the vertical direction. The rotor 1 includes a shaft 10, a magnet 11, and a counterweight 12.

The shaft 10 is a rotation shaft of the rotor 1 and is rotatable about a center axis CA. An impeller base 202 is attached to an axially upper portion of the shaft 10.

The magnet 11 is formed in a cylindrical shape extending in the axial direction and fixed to the radially outer surface of the shaft 10. The magnet 11 is located radially inward of the stator 2 and radially faces a radially inner end portion of the stator 2 with a gap.

The counter weight 12 is a member for adjusting the rotational balance of the rotor 1. The counter weight 12 is annular about the center axis CA, and in the present embodiment, the counter weight 12 is provided on the radially outer surface of the shaft 10 at a position above and below the magnet 11.

< 1-2-2. stator

Next, the structure of the stator 2 will be described with reference to fig. 2 to 4. Fig. 3 is a perspective view of an axially upper portion of the stator 2. Fig. 4 is a perspective view of the axial lower portion of the stator 2.

The stator 2 is annular about a central axis CA, and drives and rotates the rotor 1. The stator 2 includes a stator core 21, an insulator 22, and a plurality of coil portions 23.

The stator core 21 is an annular magnetic body centered on the center axis CA, and in the present embodiment, is a laminated body in which a plurality of electromagnetic steel plates are laminated in the axial direction. The stator core 21 includes a plurality of core pieces 210 arranged in the circumferential direction. The stator core 21 has a joint 2101 for joining the core members 210 adjacent in the circumferential direction. The joint 2101 is a portion to be joined between the core pieces 210 adjacent in the circumferential direction by welding, for example. The engaging portions 2101 are provided between the respective core pieces 210 adjacent in the circumferential direction, extending in the axial direction. In the present embodiment, the radially outer end of the joint 2101 protrudes radially outward from the radially outer end between the circumferentially adjacent core pieces 210.

In addition, each core piece 210 has a core back 211 and a tooth 212. In other words, the stator core 21 has a core back 211 and a tooth 212. The core back 211 is annular about the center axis CA and is held by a radially inner surface of the 1 st case 31 described later. The teeth 212 are plural and arranged in the circumferential direction. Each tooth portion 212 extends radially inward from the core back 211.

The insulator 22 is an insulating member made of, for example, a resin material, and covers at least a part of the stator core 21. The insulator 22 has a 1 st wall portion 221, a 1 st recess 222, a 1 st inner wall portion 223, a 2 nd wall portion 225, a 2 nd recess 226, and a 2 nd inner wall portion 227.

The 1 st wall 221 protrudes upward from the upper end of the stator core 21 and extends in the circumferential direction.

The 1 st recess 222 is provided at the upper end of the 1 st wall 221, and is recessed downward. The circumferential position of the 1 st recess 222 is contained between the core pieces 210 that are circumferentially adjacent. In other words, the 1 st recess 222 is overlapped between the core pieces 210 adjacent in the circumferential direction when viewed from the axial direction. The 1 st recess 222 has a 1 st inner bottom surface 2221 facing upward. As shown in fig. 3, in the present embodiment, the 1 st inner bottom surface 2221 is located above the upper end portion of the stator core 21.

However, the present invention is not limited to this example, and the 1 st recess 222 may be recessed downward to the upper end portion of the stator core 21. Fig. 5 is an enlarged view of a portion E surrounded by a broken line in fig. 3, and shows a modification of the 1 st recess 222. For example, as shown in fig. 5, the 1 st inner bottom surface 2221 may be a part of the upper surface of the stator core 21. In this case, the 1 st recess 222 may be, for example, a slit provided in the 1 st wall 221 or a slit of the 1 st wall 221. Alternatively, the 1 st wall portion 221 may be plural, and the 1 st recess 222 may be a 1 st gap between the 1 st wall portions 221 adjacent in the circumferential direction. That is, a plurality of 1 st wall parts 221 may be provided in the circumferential direction with 1 st gaps therebetween.

The 1 st inner wall 223 protrudes upward from the upper end of the stator core 21 and extends in the circumferential direction. The 1 st inner wall 223 is provided radially inward of the 1 st wall 221.

Next, the 2 nd wall portion 225 protrudes downward from the lower end portion of the stator core 21 and extends in the circumferential direction.

The 2 nd recess 226 is provided at the lower end of the 2 nd wall 225 and is recessed upward. The circumferential position of the 2 nd recess 226 is contained between the core pieces 210 that are circumferentially adjacent. In other words, the 2 nd recessed portion 226 is overlapped between the core pieces 210 adjacent in the circumferential direction when viewed from the axial direction. The 2 nd recess 226 has a 2 nd inner bottom surface 2261 facing downward. As shown in fig. 4, in the present embodiment, the 2 nd inner bottom surface 2261 is located below the lower end of the stator core 21.

However, the present invention is not limited to this example, and the 2 nd recess 226 may be recessed upward to the lower end of the stator core 21. Fig. 6 is an enlarged view of a portion F surrounded by a broken line in fig. 4, and shows a modification of the 2 nd recess 226. For example, as shown in fig. 6, the 2 nd inner bottom surface 2261 may be a part of the lower surface of the stator core 21. In this case, the 2 nd recess 226 may be, for example, a slit provided in the 2 nd wall portion 225 or a slit of the 2 nd wall portion 225. Alternatively, the 2 nd wall portion 225 may be plural, and the 2 nd recess 226 may be a 2 nd gap between the 1 st wall portions 225 adjacent in the circumferential direction. That is, a plurality of 2 nd wall portions 225 may be provided in the circumferential direction with 2 nd gaps therebetween.

The 2 nd inner wall portion 227 is provided radially inward of the 2 nd wall portion 225. The 2 nd inner wall portion 227 protrudes downward from the lower end portion of the stator core 21 and extends in the circumferential direction.

The coil portion 23 is a member in which a conductive wire (no reference numeral) is wound around the stator core 21 via the insulator 22. In the present embodiment, the coil portions 23 are provided on the core members 210 via the insulators 22. More specifically, in each coil portion 23, the wire is wound around the tooth portion 212 via the insulator 22. The ends of the wires are connected to the substrate 5.

< 1-2-3. Shell >

Next, the structure of the housing will be described with reference to fig. 2, 7, and 8. Fig. 7 is a sectional view of the housing 3. Fig. 8 is a sectional view of the axial flow fan 500 along the one-dot chain line a-a of fig. 2. Fig. 7 shows a cross-sectional structure in which the housing 3 is cut by a virtual plane including the center axis CA.

The housing 3 extends in the axial direction and houses an upper portion of the stator 2 in the axial direction. In the present embodiment, the case 3 is made of a nonmagnetic metal such as aluminum. However, the present invention is not limited to this example, and the housing 3 may be made of resin. The casing 3 includes a 1 st casing 31, a 2 nd casing 32, stationary blades 33, and an inner tube portion 34 (see fig. 2). The 1 st housing 31, the 2 nd housing 32, and the inner tube portion 34 are cylindrical extending in the axial direction. The 1 st housing 31 covers the radially outer end portion of the stator 2. The 2 nd housing 32 is provided radially outward of the 1 st housing 31. The stator blades 33 are ribs connecting the radially outer surface of the 1 st casing 31 and the radially inner surface of the 2 nd casing 32. The inner tube portion 34 is a bearing holder provided radially inward of the 1 st housing 31. The 1 st bearing 340 is provided on a radially inner end surface of the inner cylinder portion 34. The inner cylinder portion 34 rotatably supports an upper portion in the axial direction of the shaft 10 via the 1 st bearing 340.

< 1-2-3-1. the 1 st shell >)

The 1 st housing 31 has a 1 st cylinder 311, a 1 st cover 312, and a 1 st rib 313.

The 1 st cylinder portion 311 extends in the axial direction. The 1 st cylinder 311 has a step portion 3110 and a groove portion 3115.

The step portion 3110 is provided on the radially inner surface of the 1 st cylinder portion 311, and extends in the circumferential direction on the radially inner surface. In other words, the 1 st housing 31 has a stepped portion 3110. The stepped portion 3110 extends in the circumferential direction on the radially inner surface of the 1 st shell 31. Fig. 9 is an enlarged cross-sectional view of the vicinity of the step portion 3110, and is an enlarged view of a portion C surrounded by a broken line in fig. 2. As shown in fig. 9, the stepped portion 3110 includes a 1 st medial surface 3111, a 2 nd medial surface 3112 and a 3 rd medial surface 3113. The 1 st inner surface 3111 and the 2 nd inner surface 3112 are portions of the radial inner surface of the 1 st tube portion 311, and face radially inward. The 1 st inner surface 3111 is opposed to the radially outer end of the stator core 21 in a spaced state or in a contact state (see fig. 9) in the radial direction. The 2 nd inner surface 3112 is located radially inward and above the 1 st inner surface 3111. The 3 rd inner surface 3113 extends downward from the upper end of the 1 st inner surface 3111 to the lower end of the 2 nd inner surface 3112. In other words, the radially outer end portion of the 3 rd inner surface 3113 is connected to the upper end portion of the 1 st inner surface 3111, and the radially inner end portion of the 3 rd inner surface 3113 is connected to the lower end portion of the 2 nd inner surface 3112. As shown in fig. 9, the 3 rd inner side surface 3113 is in contact with the upper end portion of the stator core 21. By bringing the downward 3 rd inner surface 3113 into contact with the upper end portion of the stator core 21 made of, for example, electromagnetic steel plates, when the stator 2 is housed in the 1 st case 31, the stator 2 can be positioned in the axial direction with respect to the 1 st case 31 with high accuracy. For example, the above positioning can be performed with higher accuracy than in the case where the upper end of the insulator 22 is brought into contact with the lower surface of the 1 st lid 312 of the 1 st housing 31 to determine the axial position of the stator 2 with respect to the 1 st housing 31.

The groove portion 3115 is provided on the radially inner side surface of the 1 st tube portion 311, and extends upward from the lower end of the 1 st tube portion 311 to the step portion 3110. The groove portion 3115 is recessed radially outward from the radially inner surface of the 1 st cylindrical portion 311. In other words, the 1 st housing 31 has a plurality of groove portions 3115. The groove 3115 is recessed radially outward from the radially inner surface of the 1 st case 31, and extends upward from the lower end of the 1 st case 31. The circumferential position of the groove portion 3115 is the same as the circumferential position of the engaging portion 2101 of the core member 210.

When the circumferentially adjacent core members 210 are joined by welding or the like, for example, the radially outer end of the joint 2101 may protrude radially outward from the radially outer surface of the core member 210. Even if the radially outer end portions of the engaging portions 2101 protrude, the circumferential positions of the groove portions 3115 are the same as the circumferential positions of the engaging portions 2101, and therefore, when the stator 2 is housed in the 1 st housing 31, the radially outer end portions of the engaging portions 2101 can be housed in the groove portions 3115. Therefore, the contact of the engaging portion 2101 with the radially inner side surface of the 1 st housing 31 can be suppressed or prevented. Therefore, for example, when the stator 2 is housed in the 1 st case 31, the stator 2 can be prevented from being caught on the radially inner surface of the 1 st case 31 or the like in the middle of the housing. Therefore, the stator 2 can be easily housed in the 1 st housing 31.

When the radially outer end portion of the engaging portion 2101 protrudes radially outward, the protruding portion is housed in the groove portion 3115. By disposing the radially outer end portions of the engaging portions 2101 in the groove portion 3115, the engaging portions 2101 can be moved in the axial direction along the groove portion 3115 when the stator 2 is housed in the 1 st housing 31. Therefore, the stator 2 can be housed in the 1 st housing 31 more easily. The protruding portion of the engaging portion 2101 is housed in the groove portion 3115, and thereby faces the inner surface of the groove portion 3115 in the circumferential direction at a distance or in contact with each other. Therefore, the stator 2 can be suppressed or prevented from rotating in the circumferential direction with respect to the 1 st housing 31.

Next, the 1 st lid 312 is expanded radially inward from the upper end of the 1 st tube 311. The 1 st cover 312 has a plurality of 1 st support portions 3121 and a plurality of 1 st openings 3122. The 1 st support portion 3121 extends radially inward from the upper end portion of the 1 st tube portion 311. The radially inner end portion of the 1 st support portion 3121 is connected to the radially outer surface of the inner cylinder portion 34. The 1 st opening 3122 is surrounded by the upper end portion of the 1 st tube portion 311, the 1 st support portion 3121, and the axial lower portion of the inner tube portion 34.

In addition, the 1 st rib 313 has a plate shape expanding in the axial direction and the radial direction. In the present embodiment, the circumferential position of the 1 st rib 313 is the same as the circumferential position of the engaging portion 2101 of the core member 210. In the present embodiment, the 1 st rib 313 is connected to the lower surface of the 1 st cover 312 and the radially inner surface of the 1 st tube 311. The 1 st rib 313 is connected to both the lower surface of the 1 st cover 312 and the radially inner surface of the 1 st tube 311, so that the 1 st rib 313 reinforces the upper end of the 1 st shell 31 and improves the rigidity of the 1 st shell 31.

However, the present embodiment is not limited to the example, and the 1 st rib 313 may be connected to the lower surface of the 1 st cover 312, not to the radially inner surface of the 1 st tube 311. In other words, the 1 st rib 313 may protrude downward from the lower surface of the 1 st cover 312. Alternatively, the 1 st rib 313 may be connected to the radially inner surface of the 1 st tube 311 without being connected to the lower surface of the 1 st cover 312. In other words, the 1 st rib 313 may be a member that protrudes radially inward from the radially inner surface of the 1 st tube portion 311. That is, the 1 st rib 313 may be connected to at least one of the lower surface of the 1 st cover 312 and the radially inner surface of the 1 st tube 311.

The 1 st rib 313 is disposed in the 1 st recess 222 of the insulator 22. By disposing the 1 st rib 313 in the 1 st recess 222, when the stator 2 is housed in the 1 st housing 31, the stator 2 can be easily positioned in the circumferential direction with respect to the 1 st housing 31. Further, by disposing the 1 st rib 313 in the 1 st recess 222 of the insulator 22, the circumferential end surface of the 1 st rib 313 faces the circumferential inner surface of the 1 st recess 222 with a space therebetween or in contact therewith. Therefore, the stator 2 can be suppressed or prevented from rotating in the circumferential direction with respect to the 1 st housing 31. Therefore, the circumferential position of the stator 2 with respect to the housing 3 can be easily positioned.

Further, the 1 st rib 313 is apart from the coil part 23 in the upper part in the axial direction of the stator 2. The 1 st rib 313 may be spaced apart from the coil portion 23 in at least one of the axial direction and the circumferential direction. Since the 1 st rib 313 is apart from the coil portion 23, even if the 1 st recess 222 is overlapped between core members 210 adjacent in the circumferential direction when viewed from the circumferential direction, for example, the 1 st rib 313 can be prevented from coming into contact with the upper end portion of the coil portion 23. As described above, the 1 st recess 222 overlaps the core members 210 adjacent in the circumferential direction when viewed from the axial direction, and thereby the interval between the 1 st rib 313 and the upper end portion of the coil portion 23 can be further increased. Therefore, the coil section 23 can be prevented from being electrically connected to the 1 st case 31 made of, for example, metal via the 1 st rib 313.

In the present embodiment, the 1 st rib 313 faces the 1 st inner bottom surface 2221 of the 1 st recessed portion 222 facing upward with a gap therebetween in the axial direction. That is, since the 1 st rib 313 has a gap from the 1 st inner bottom surface 2221 of the 1 st recess 222, the 1 st rib 313 can be prevented from contacting the insulator 22 when the stator 2 is housed in the 1 st case 31. Therefore, the stator 2 can be positioned at another position where the positioning accuracy in the axial direction of the stator 2 is higher. For example, as described above, the stator 2 can be positioned with high accuracy with respect to the 1 st housing 31 at the portion where the stepped portion 3110 abuts against the radially outer end portion of the stator core 21.

Next, the 1 st rib 313 has a 1 st inclined surface 3131 and a 1 st depressed portion 3132.

The 1 st inclined surface 3131 is provided at a radially inner end portion of the 1 st rib 313. More specifically, the 1 st inclined surface 3131 is a surface provided between and connecting the axial lower end portion and the radial inner end portion of the 1 st rib 313. The 1 st inclined surface 3131 extends radially inward from the lower end of the 1 st rib 313 upward. In other words, the 1 st inclined surface 3131 extends downward from the radially inner end portion of the 1 st rib 313 toward the radially outer side. By providing the 1 st inclined surface 3131 at the radially inner end portion of the 1 st rib 313, the interval between the 1 st rib 313 and the upper end portion of the coil portion 23 can be further enlarged. Therefore, the coil section 23 can be more reliably prevented from being electrically connected to the 1 st case 31 made of, for example, metal via the 1 st rib 313.

In the present embodiment, the 1 st inclined surface 3131 is a flat surface inclined radially inward as it goes upward. However, the first inclined surface 3131 is not limited to the example of the present embodiment, and may be a curved surface which is concave upward and outward in the radial direction, or may be a curved surface which bulges downward and inward in the radial direction.

The 1 st depressed part 3132 is disposed on the 1 st inclined surface 3131. The 1 st depressed portion 3132 is depressed in at least one of the upward direction and the radially outward direction from the 1 st depressed surface 3131. In addition, the 1 st depression 3132 overlaps the 1 st inner wall portion 223 of the insulator 22 when viewed from the axial direction. By providing the 1 st depressed portion 3132 on the 1 st inclined surface 3131 so as to overlap the 1 st inner wall portion 223 when viewed from the axial direction, the 1 st rib 313 is less likely to contact the 1 st inner wall portion 223 of the insulator 22 when the stator 2 is housed in the 1 st housing 31.

< 1-2-4. housing cover >

Next, the structure of the housing cover 4 will be described with reference to fig. 2, 10, and 11. Fig. 10 is a perspective view of the housing cover 4. Fig. 11 is a sectional view of the axial flow fan 500 along the two-dot chain line B-B of fig. 2.

The case cover 4 is attached to the lower end portion of the 1 st case 31 to cover the lower end portion of the 1 st case 31. The housing cover 4 accommodates an axially lower portion of the stator 2. As shown in fig. 10, the housing cover 4 includes a 2 nd cylinder portion 41, a 2 nd cover portion 42, and a 2 nd rib 43.

The 2 nd cylindrical portion 41 extends in the axial direction and is attached to the lower end portion of the 1 st cylindrical portion 311. The 2 nd cylinder portion 41 has a cover step portion 410 and a cover groove portion 415.

The cover step portion 410 is provided on the radially inner surface of the 2 nd cylinder portion 41 and extends in the circumferential direction. In other words, the housing cover 4 has a cover step portion 410. The shroud step 410 extends in the circumferential direction on the radially inner surface of the casing shroud 4. Fig. 12 is an enlarged cross-sectional view of the vicinity of the cover step portion 410, and is an enlarged view of a portion D surrounded by a broken line in fig. 2. As shown in fig. 12, the cover step portion 410 includes a 1 st cover inner surface 411, a 2 nd cover inner surface 412, and a 3 rd cover inner surface 413. The 1 st cover inner surface 411 and the 2 nd cover inner surface 412 are parts of the radial inner surface of the 2 nd tube portion 41 and face radially inward. The 1 st-cover inner surface 411 is radially opposed to a radially outer end portion of the lower end portion of the stator core 21 in a spaced state or in a contact state (see fig. 12). The 2 nd cover inner surface 412 is located radially inward below the 1 st cover inner surface 411. The 3 rd cover inner surface 413 extends upward from the lower end of the 1 st cover inner surface 411 to the upper end of the 2 nd cover inner surface 412. In other words, the radially outer end of the 3 rd cover inner surface 413 is connected to the lower end of the 1 st cover inner surface 411, and the radially inner end of the 3 rd cover inner surface 413 is connected to the upper end of the 2 nd cover inner surface 412. As shown in fig. 12, the 3 rd cover inner side 413 is in contact with the lower end portion of the stator core 21. By bringing the upward-facing 3 rd housing inner surface 413 into contact with the lower end portion of the stator core 21 using, for example, an electromagnetic steel plate, when the housing cover 4 is attached to the 1 st housing 31, the housing cover 4 can be positioned in the axial direction with respect to the 1 st housing 31 with high accuracy.

The cover groove portion 415 is provided on the radially inner surface of the 2 nd cylindrical portion 41, and extends downward from the upper end of the 2 nd cylindrical portion 41 to the cover stepped portion 410. The cover groove portion 415 is recessed radially outward from the radially inner surface of the 2 nd cylinder portion 41. The housing cover 4 has a plurality of cover groove portions 415. The cover groove portion 415 is recessed radially outward from the radially inner surface of the housing cover 4, and extends downward from the upper end of the housing cover 4.

Since the circumferential position of the cover groove portion 415 is the same as the circumferential position of the engaging portion 2101 of the core member 210, when the axial lower portion of the stator 2 is housed in the housing cover 4, even if the radially outer end portion of the engaging portion 2101 protrudes, the radially outer end portion of the engaging portion 2101 can be housed in the cover groove portion 415. Therefore, the contact of the engaging portion 2101 with the radially inner side surface of the housing cover 4 can be suppressed or prevented. For example, when the lower portion of the stator 2 in the axial direction is housed in the housing cover 4, the stator 2 can be prevented from being caught on the inner surface of the housing cover 4 in the radial direction or the like in the middle of the housing. Therefore, the lower portion of the stator 2 in the axial direction can be easily housed in the housing cover 4. Further, the projecting portion of the radially outer end portion of the engaging portion 2101 is housed in the cover groove portion 415, thereby facing the circumferentially inner surface of the cover groove portion 415 with a space therebetween or in contact therewith. Therefore, the housing cover 4 can be suppressed or prevented from rotating in the circumferential direction with respect to the stator 2.

In the present embodiment, by disposing the radially outer end portions of the engaging portions 2101 in the cover groove portion 415, the engaging portions 2101 can be moved in the axial direction along the cover groove portion 415 when the axially lower portion of the stator 2 is housed in the housing cover 4. Therefore, the lower portion of the stator 2 in the axial direction can be more easily housed in the housing cover 4.

Next, the 2 nd lid portion 42 is expanded radially inward from the lower end portion of the 2 nd tube portion 41. The 2 nd cover part 42 has an annular part 421, a plurality of 2 nd support parts 422, and a plurality of 2 nd openings 423. The annular portion 421 has an annular shape centered on the central axis CA. The 2 nd support portion 422 extends radially inward from the lower end of the 2 nd cylindrical portion 41. The radially inner end of the 2 nd support portion 422 is connected to the radially outer end of the annular portion 421. The 2 nd opening 423 is surrounded by the lower end portion of the 2 nd cylinder portion 41, the radially outer end portion of the annular portion 421, and the 2 nd support portion 422.

In addition, the 2 nd rib 43 has a plate shape expanding in the axial direction and the radial direction. The 2 nd rib 43 is connected to the upper surface of the 2 nd cover 42 and the radially inner surface of the 2 nd tube 41. When the 2 nd rib 43 is connected to both the upper surface of the 2 nd cover portion 42 and the radially inner surface of the 2 nd tube portion 41, the 2 nd rib 43 can reinforce the lower end portion of the housing cover 4 and improve the rigidity of the housing cover 4.

However, the present embodiment is not limited to the example, and the 2 nd rib 43 may be connected to the upper surface of the 2 nd lid portion 42, not to the radially inner side surface of the 2 nd tube portion 41. In other words, the 2 nd rib 43 may protrude upward from the upper surface of the 2 nd cover 42. Alternatively, the 2 nd rib 43 may be connected to the radially inner side surface of the 2 nd tube portion 41, but not connected to the upper surface of the 2 nd lid portion 42. In other words, the 2 nd rib 43 may protrude radially inward from the radially inner surface of the 2 nd tube portion 41. That is, the 2 nd rib 43 may be connected to at least one of the upper surface of the 2 nd cover portion 42 and the radially inner surface of the 2 nd tube portion 41.

The 2 nd rib 43 is disposed in the 2 nd recess 226. By disposing the 2 nd rib 43 in the 2 nd recess 226 of the insulator 22, when the housing cover 4 is attached to the lower end portion of the 1 st housing 31 and the lower portion in the axial direction of the stator 2 is housed in the housing cover 4, the housing cover 4 can be easily positioned in the circumferential direction of the stator 2. Further, by disposing the 2 nd rib 43 in the 2 nd recess 226 of the insulator 22, the circumferential end face of the 2 nd rib 43 faces the circumferential inner surface of the 2 nd recess 226 at a spaced interval or in contact with each other, and therefore, the rotation of the housing cover 4 in the circumferential direction with respect to the axial lower portion of the stator 2 can be suppressed or prevented.

In addition, in the lower portion in the axial direction of the stator 2, the 2 nd rib 43 is apart from the coil portion 23. Therefore, for example, even if the 2 nd recessed portion 226 is overlapped between the core members 210 adjacent in the circumferential direction when viewed from the circumferential direction, contact with the upper end portion of the coil portion 23 can be prevented. As described above, the 2 nd recessed portion 226 is overlapped between the core members 210 adjacent in the circumferential direction when viewed from the axial direction, whereby the interval between the 2 nd rib 43 and the upper end portion of the coil portion 23 can be further enlarged.

In the present embodiment, the 2 nd rib 43 faces the 2 nd inner bottom surface 2261 of the 2 nd recessed portion 226 facing downward at a distance in the axial direction. That is, since the 2 nd rib 43 has a gap from the 2 nd inner bottom surface 2261 of the 2 nd recess 226, the 2 nd rib 43 can be prevented from contacting the insulator 22 when the lower portion in the axial direction of the stator 2 is housed in the housing cover 4.

Next, the 2 nd rib 43 has a 2 nd inclined surface 431 and a 2 nd recessed portion 432.

The 2 nd inclined surface 431 is provided at a radially inner end portion of the 2 nd rib 43. More specifically, the 2 nd inclined surface 431 is a surface provided between and connecting the axially upper end portion and the radially inner end portion of the 2 nd rib 43. The 2 nd inclined surface 431 spreads radially inward from the upper end portion of the 2 nd rib 43 toward the lower side. In other words, the 2 nd inclined surface 431 spreads upward from the radially inner end of the 2 nd rib 43 toward the radially outer side. By providing the 2 nd inclined surface 431 at the radially inner end portion of the 2 nd rib 43, the interval between the 2 nd rib 43 and the lower end portion of the coil portion 23 can be further enlarged. In the present embodiment, the 2 nd inclined surface 431 is a flat surface inclined radially inward as it goes downward. However, the 2 nd inclined surface 431 is not limited to the example of the present embodiment, and may be a curved surface that is concave downward and outward in the radial direction, or may be a curved surface that bulges upward and inward in the radial direction.

The 2 nd recessed part 432 is provided on the 2 nd inclined surface 431. The 2 nd recessed portion 432 is recessed downward and radially outward from the 2 nd inclined surface 431 in at least one direction. In addition, the 2 nd recessed portion 432 overlaps the 2 nd inner wall portion 227 of the insulator 22 when viewed from the axial direction. By providing the 2 nd recessed portion 432 on the 2 nd inclined surface 431 so as to overlap the 2 nd inner wall portion 227 when viewed in the axial direction, the 2 nd rib 43 is less likely to contact the 2 nd inner wall portion 227 of the insulator 22 when the lower portion in the axial direction of the stator 2 is housed in the housing cover 4.

< 2. other >)

The embodiments of the present invention have been described above. The scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented by applying various modifications to the above-described embodiments within a scope not departing from the gist of the present invention. The matters described in the above embodiments can be arbitrarily combined as appropriate within a range that does not contradict each other.

Industrial applicability

The present invention is useful, for example, in a motor in which a stator is housed in a case, and a device in which the motor is mounted.

Claims (11)

1. A motor is characterized in that a motor is provided,

the motor has:

a rotor that is rotatable about a central axis extending in a vertical direction;

a stator driving the rotor; and

a cylindrical 1 st housing extending in an axial direction, covering a radially outer end portion of the stator,

the stator has:

an annular stator core centered on the central axis; and

an insulator covering at least a portion of the stator core,

the insulating member has:

a 1 st wall portion that protrudes upward from an upper end portion of the stator core and extends in a circumferential direction; and

a 1 st recess which is provided at an upper end portion of the 1 st wall portion and is recessed downward,

the 1 st housing has:

a 1 st cylinder part extending in an axial direction;

a 1 st lid portion that extends radially inward from an upper end portion of the 1 st tube portion; and

a plate-shaped 1 st rib expanding in the axial direction and the radial direction,

the 1 st rib is connected to at least one of a lower surface of the 1 st lid and a radially inner surface of the 1 st tube, and is disposed in the 1 st recess.

2. The motor of claim 1,

the stator core includes a plurality of core pieces arranged in a circumferential direction,

the stator has a plurality of coil portions provided on the core members with the insulating material interposed therebetween,

the 1 st recess overlaps with the core member adjacent in the circumferential direction as viewed from the axial direction,

the 1 st rib is away from the coil portion.

3. The motor of claim 2,

the 1 st case has a plurality of groove portions recessed radially outward from a radially inner side surface and extending upward from a lower end of the 1 st case,

the stator core has an engaging portion that engages the core members adjacent in the circumferential direction,

circumferential positions of the groove portion and the 1 st rib are the same as a circumferential position of the engaging portion.

4. The motor of claim 3,

the radially outer end of the joint portion protrudes radially outward from the radially outer end between the circumferentially adjacent core members, and is disposed in the groove portion.

5. The motor according to any one of claims 1 to 4,

the 1 st rib is axially opposed to an upward facing inner bottom surface of the 1 st recess with a space therebetween.

6. The motor according to any one of claims 1 to 4,

the 1 st shell has a step portion extending in a circumferential direction on a radially inner side surface,

the step portion includes:

a 1 st inner surface facing radially inward and facing radially outward end portions of the stator cores;

a 2 nd inner surface facing radially inward and located above the 1 st inner surface and radially inward; and

a 3 rd inner side surface which extends from an upper end portion of the 1 st inner side surface to a lower end portion of the 2 nd inner side surface,

the 3 rd inner side faces downward and contacts with an upper end portion of the stator core.

7. The motor according to any one of claims 1 to 4,

the 1 st rib has a 1 st inclined surface,

the 1 st inclined surface is provided at a radially inner end portion of the 1 st rib, and extends radially inward from a lower end portion of the 1 st rib toward an upper side.

8. The motor of claim 7,

the insulator further includes an inner wall portion protruding upward from an upper end portion of the stator core and extending in a circumferential direction, the inner wall portion being provided radially inward of the 1 st wall portion,

the 1 st rib further has a recess portion provided to the 1 st inclined surface,

the recessed portion is recessed in at least one of an upward direction and a radially outward direction from the 1 st inclined surface, and overlaps the inner wall portion when viewed in an axial direction.

9. The motor according to any one of claims 1 to 4,

the motor further includes a housing cover attached to and covering a lower end portion of the 1 st housing, the housing cover accommodating an axially lower portion of the stator,

the housing cover has:

a 2 nd cylindrical portion extending in the axial direction and attached to a lower end portion of the 1 st cylindrical portion;

a 2 nd lid portion that extends radially inward from a lower end portion of the 2 nd cylindrical portion; and

a plate-shaped 2 nd rib expanded in the axial and radial directions,

the insulating member has:

a 2 nd wall portion protruding downward from a lower end portion of the stator core and extending in a circumferential direction; and

a 2 nd recess portion provided at a lower end portion of the 2 nd wall portion and recessed upward,

the 2 nd rib is connected to at least one of an upper surface of the 2 nd lid and a radially inner surface of the 2 nd tube, and is disposed in the 2 nd recess.

10. The motor of claim 9,

the 2 nd rib has a 2 nd inclined surface,

the 2 nd inclined surface is provided at a radially inner end portion of the 2 nd rib, and extends radially inward from an upper end portion of the 2 nd rib downward.

11. An axial-flow fan, characterized in that,

the axial flow fan comprises:

the motor of any one of claims 1 to 4; and

an impeller mounted on a rotor of the motor,

the motor further has:

a 2 nd housing which is formed in a tubular shape extending in an axial direction and is provided at a position radially outside the 1 st housing; and

stationary blades connecting a radially outer side surface of the 1 st casing and a radially inner side surface of the 2 nd casing,

the impeller includes a rotor blade rotatable together with the rotor about the central axis.

Images