WO2017163797A1

WO2017163797A1 - Motor and fan motor attachment structure

Info

Publication number: WO2017163797A1
Application number: PCT/JP2017/008153
Authority: WO
Inventors: 佐藤　純一; 基史大辻
Original assignee: ダイキン工業株式会社
Priority date: 2016-03-25
Filing date: 2017-03-01
Publication date: 2017-09-28
Also published as: JP2018068095A

Abstract

Provided are a motor and a fan motor attachment structure, whereby vibration and noise can be reduced and pieces of an outer rotor can be prevented from scattering even if the outer rotor is damaged. The motor includes: a resin main body (25) holding an inner stator (31); and an outer rotor (32) that rotates around the inner stator (31). Part of the resin main body (25) is positioned on the outside of the outer rotor (32) in the radial direction and covers part of the outer rotor (32).

Description

Motor and fan motor mounting structure

The present invention relates to a motor and fan motor mounting structure used in, for example, an outdoor unit of an air conditioner.

Conventionally, as this type of motor, there is one described in JP 2000-166146 A (Patent Document 1).

This conventional motor has a main body for holding the stator and an outer rotor positioned outside the stator in the radial direction.

Also, as a conventional fan motor mounting structure, there is one described in Japanese Patent Application Laid-Open No. 2004-40885 (Patent Document 2).

In this conventional fan motor mounting structure, a fan motor motor is placed in a hollow space in the middle of the upright substantially ladder-shaped mounting base, and this motor is fixed to the mounting base with screws.

JP 2000-166146 A JP 2004-40885 A

However, in the motor described in Patent Document 1, since the outer rotor is exposed from the main body holding the stator, the noise released to the outside is large, and when the outer rotor is broken, fragments of the outer rotor There is a problem that is scattered and dangerous.

Further, in the fan motor mounting structure described in Patent Document 2, since the motor is disposed in a space through which the substantially ladder-shaped mounting base penetrates, the rigidity and noise suppression function are insufficient, and vibration and noise are unavoidable. There is a problem that the occurrence of large.

Therefore, an object of the present invention is to provide a motor and fan motor mounting structure that can reduce noise and vibration and prevent the fragments from being scattered even if the outer rotor is damaged.

In order to solve the above problems, the motor of the present invention is
A resin body that holds the inner stator;
An outer rotor that rotates around the inner stator;
A rotating shaft having one end fixed to the outer rotor;
It comprises a rolling bearing on the front side and the rear side that rotatably supports the rotating shaft,
The outer ring of the rolling bearing on the front side and the rear side is supported on the resin body side,
A part of the resin main body is located outside in the radial direction of the outer rotor and covers a part of the outer rotor.

According to the motor having the above configuration, a part of the resin main body is located outside the outer rotor in the radial direction and covers a part of the outer rotor. The above-mentioned part of the resin main body can reduce the noise emitted to the outside, and can prevent the outer rotor fragments from scattering to the outside when the outer rotor is damaged.

Moreover, since the resin main body can be a structure that covers the inner stator itself without gaps, heat conduction is not hindered and heat dissipation is high.

In one embodiment,
The outer rotor has a fixed portion fixed to the rotating shaft, and a cylindrical portion extending in the axial direction from an outer end portion in the radial direction of the fixed portion,
The part of the resin main body covers the cylindrical portion.

Since the cylindrical portion extends in the axial direction from the radially outer end portion of the fixed portion fixed to the rotating shaft, it receives a greater centrifugal force than the radially inner end portion of the fixed portion.

However, since the part of the resin main body covers the cylindrical part, even if the cylindrical part is damaged, the scattering can be prevented.

In one embodiment,
The resin body has a first portion and a second portion located on both sides of the inner stator in the axial direction, and the axial thickness of the first portion not facing the outer rotor in the axial direction is It is thicker than the axial thickness of the second part facing the outer rotor in the axial direction.

According to the embodiment, the axial thickness of the first portion that does not face the outer rotor in the axial direction is thicker than the axial thickness of the second portion that faces the outer rotor in the axial direction. The first portion that does not face the outer rotor in the axial direction is harder to crack (is less likely to break) than the second portion, whereas the axial thickness of the second portion that faces the outer rotor in the axial direction. Since the thickness is smaller than the thickness of the first portion in the axial direction, the second portion is more easily cracked by heat than the first portion.

However, the first portion facing the outside is difficult to crack, the second portion facing the outer rotor in the axial direction and the second portion not facing the outside is easily cracked, but the second portion faces the outer rotor in the axial direction. Therefore, even if the second portion is cracked, adverse effects on the outside can be reduced by the outer rotor. If the first portion facing the outside breaks, a great damage is immediately caused to the outside.

In one embodiment,
A back cover that covers the outer rotor from the axial direction is fixed to the resin body,
The back cover protrudes on the side opposite to the resin main body side from the mounting surface of the back cover or the resin main body attached to the end surface of the mounting base.

According to the embodiment, the back cover protrudes on the side opposite to the resin main body side from the mounting surface of the back cover or the resin main body, and thus the resin main body from the mounting surface of the motor. The amount of protrusion to the side can be reduced.

In one embodiment,
The inner ring of the rolling bearing on the rear side is in contact with the outer rotor in the axial direction.

According to the embodiment, since the inner ring of the rolling bearing on the rear surface side is in contact with the outer rotor in the axial direction, the outer ring is pressed against the resin main body in the axial direction by the outer rotor. It can be fixed, and there is no need for a separate member such as a nut for fixing the inner ring of the rolling bearing on the rear surface side to the rotating shaft. Therefore, the number of parts can be reduced, and the cost can be reduced and the assembly can be easily performed. it can.

In one embodiment,
The outer ring of the rolling bearing on the front side and the rear side is fitted with a gap or a dead fit on the resin body side,
Inner rings of the front and rear rolling bearings are press-fitted into the rotary shaft.

According to the embodiment, the inner rings of the front and rear rolling bearings are press-fitted and fixed to the rotary shaft, while the outer rings of the front and rear rolling bearings are on the resin body side. Since the clearance fit or the stop fit is provided, the rotating shaft can be supported with high coaxial accuracy, and vibration and noise can be reduced.

The fan motor mounting structure of this embodiment is
A fan motor having the above motor and fan;
A mounting base on which the motor is mounted;
With
The part of the mounting base facing the back side of the motor that is the other end side of the rotating shaft on the side opposite to the one end side of the rotating shaft of the motor to which the fan is mounted is recessed from the motor side. It is a recess.

According to the fan motor mounting structure of the above configuration, since the portion of the mounting base facing the back side of the motor is a concave portion recessed from the motor side, this concave portion increases the rigidity of the mounting base and vibrates. Noise can be reduced.

Also, since this recess serves to shield the noise from the motor, the noise can be reduced.

In one embodiment,
The concave portion of the mounting base also serves as a back cover of the motor.

According to the above embodiment, the concave portion of the mounting base also functions as the back cover of the motor, so that foreign matter can be prevented from entering the motor, and safety is not impaired.

In addition, since the concave portion of the mounting base also serves as the back cover of the motor, the back cover that has been conventionally used in the motor itself can be omitted, and the number of parts can be reduced and the cost can be reduced.

In one embodiment,
A sealing member is provided for sealing between the mounting base and the back side of the motor.

According to the above embodiment, since the sealing member for sealing between the mounting base and the back side of the motor is provided, even if the conventional back cover is omitted from the motor itself, foreign matter enters the motor. Can be reliably prevented.

The fan motor mounting structure of this invention is
A fan motor having a motor and a fan;
A mounting base on which the motor is mounted;
The part of the mounting base facing the back side of the motor that is the other end side of the rotating shaft on the side opposite to the one end side of the rotating shaft of the motor to which the fan is mounted is recessed from the motor side. It is a recess.

The motor of the fan motor mounting structure of the present invention is not limited to the outer rotor type motor, but may be an inner rotor type motor.

In one embodiment,
The motor of the fan motor is an outer rotor type motor.

According to the above-described embodiment, even if the outer rotor type motor is large in output and easily generates vibration and noise as compared with the inner rotor type motor, the mounting base is a depression facing the back surface of the motor. Since it has a concave portion, vibration and noise can be sufficiently reduced.

In one embodiment,
The motor
A resin body that holds the inner stator;
An outer rotor that rotates around the inner stator;
A rotating shaft having one end fixed to the outer rotor;
It comprises a rolling bearing on the front side and the rear side that rotatably supports the rotating shaft,
Outer rings of the front and rear rolling bearings are supported on the resin body side.

According to the embodiment, the rotary shaft having one end fixed to the outer rotor is rotatably supported by the front and rear rolling bearings in which the outer ring is supported on the resin main body side holding the inner stator. Thus, the rotating shaft can be supported with high coaxial accuracy, and vibration and noise can be reduced.

Also, the outer ring of the rolling bearing on the front side and the rear side that rotatably supports the rotating shaft having one end fixed to the outer rotor is supported on the resin main body side that holds the inner stator. Is easy and cheap.

Here, the resin main body side is a concept including not only the resin main body but also the metal support member when a metal support member is inserted in the resin main body.

According to the motor of the present invention, a part of the resin main body is located outside the outer rotor in the radial direction and covers a part of the outer rotor. The above-mentioned part of the resin main body can reduce the noise emitted to the outside, and can prevent the outer rotor fragments from scattering to the outside when the outer rotor is damaged.

Further, according to the fan motor mounting structure of the present invention, the portion of the mounting base that faces the back side of the motor is a recess recessed from the motor side, so that vibration and noise can be reduced.

1A and 1B show a fan motor mounting structure according to a first embodiment, wherein FIG. 1A is a front view, FIG. 1B is a right side view, FIG. 1C is a perspective view, and FIG. It is the II-II sectional view taken on the line of (A) of FIG. It is sectional drawing of the principal part of the fan motor mounting structure of 2nd Embodiment. It is sectional drawing of the principal part of the fan motor mounting structure of 3rd Embodiment. (A), (B), (C), (D), and (E) of FIG. 5 are views for explaining a method of manufacturing a motor according to the first embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
1A is a front view of the fan motor mounting structure of the first embodiment, FIG. 1B is a right side view of the fan motor mounting structure, and FIG. 1C is the fan. 1 is a perspective view of a motor mounting structure, and FIG. 1D is an exploded perspective view of the fan motor mounting structure.

As shown in FIGS. 1A to 1D, the mounting base 10 has a substantially U-shape made of sheet metal, and has

horizontal portions

11 and 11 and a vertical portion 12. A substantially frustoconical concave portion 13 is formed at the center of the vertical portion 12, and substantially rectangular through

holes

14 and 15 are provided above and below the concave portion 13.

The recess 13 is not limited to a bottomed truncated cone shape, and may be a bottomed cylindrical shape, a bottomed rectangular tube shape, or the like. Moreover, it is preferable from the point of cost etc. to produce the said recessed part 13 by press molding, such as deep drawing, for example.

On the other hand, a part of the back side of the motor 20 of the fan motor 200 (see FIG. 2) composed of the motor 20 and the fan 21 (see FIG. 2) is disposed in the recess 13 of the mounting base 10, and FIG. Are fixed to the outside of the recess 13 with

screws

24, 24,...

As shown in FIG. 2, the motor 20 includes a housing 30 including a front case 25 and a back case 26 as a back cover, and a rotary shaft rotatably supported on the front case 25 via

bearings

27 and 28. 23, an inner stator 31 fixed to the front case 25, and an outer rotor 32 disposed outside the inner stator 31, and is an outer rotor type motor. The fan 21 is fixed to one end side 23 a of the rotating shaft 23, and the outer rotor 32 is fixed to the other end side 23 b of the rotating shaft 23. The inner stator 31 is made of, for example, laminated electromagnetic steel sheets, and coils 311 and 311 are wound around the inner stator 31.

The rear cover 26, which is the rear case 26 of the motor 20 on the other end side 23b of the rotating shaft 23, is disposed in the recess 13 to make the fan motor mounting structure compact. The recess 13 is a part of the mount 10 and is recessed from the motor 20 side.

According to the fan motor mounting structure of the above configuration, the portion 13 of the mounting base 10 facing the back surface of the motor 20 is a concave portion 13 that is recessed from the motor 20 side. In addition, vibration and noise can be reduced.

Further, since the concave portion 13 covers the back side of the motor 20 and also serves to block noise from the motor 20, noise can be reduced.

Further, the motor 20 of the first embodiment is an outer rotor type motor that has a larger output and is likely to generate vibration and noise than an inner rotor type motor (not shown). Since it has the recessed part 13 which opposes the back surface of the motor 20, a vibration and a noise can fully be reduced and the problem of a noise and a vibration can be eliminated.

Note that vibration and noise can be similarly reduced by using an inner rotor type motor instead of the outer rotor type motor 20.

Next, a more detailed explanation will be given focusing on the motor 20.

As shown in FIG. 2, the front case 25 that holds the inner stator 31 is made of resin such as BMC (unsaturated polyester) resin. Hereinafter, the front case 25 is referred to as a resin main body 25 in some cases.

A substantially cup-shaped outer rotor 32 rotates around the inner stator 31. The other end side 23 b of the rotating shaft 23 is fixed to the center of the outer rotor 32. The rotating shaft 23 is rotatably supported by

bearings

27 and 28. The

bearings

27 and 28 are, for example, rolling

bearings

27 and 28 such as ball bearings, roller bearings, and tapered roller bearings.

The resin main body 25 has an annular step portion 257 that supports the rolling bearing 27 on the front side that is the fan 21 side, that is, the load side, and an annular step portion 258 that supports the rolling bearing 28 on the back side, that is, the rear side. Front and rear rolling

bearings

27 and 28 are fitted into the

annular step portions

257 and 258 of the resin body 25, and the front and rear rolling

bearings

27 and 28 are supported by the resin body 25. The

inner rings

27a, 28a of the rolling

bearings

27, 28 on the front side and the rear side are press-fitted and fixed to the rotary shaft 23, while the

outer rings

27b, 28b of the rolling

bearings

27, 28 on the front side and the rear side are made of resin. The main body 25 is fitted with a gap or a dead fit. Therefore, the rotary shaft 23 is supported on the resin body 25 by the front and rear rolling

bearings

27 and 28 with high coaxial accuracy. As described above, the rotating shaft 23 is supported on the resin body 25 by the front and rear rolling

bearings

27 and 28 with high coaxial accuracy, so that noise and vibration can be reduced.

Further, the inner ring 28 a of the rolling bearing 28 on the rear surface side is in contact with the center portion of the outer rotor 32 in the axial direction. For this reason, the inner ring 28a of the rolling bearing 28 on the rear surface side can be fixed by being pressed toward the resin body 25 in the axial direction by the outer rotor 32. For this reason, a separate member such as a nut for fixing the inner ring 28a of the rolling bearing 28 on the rear surface side to the rotary shaft 23 can be eliminated. Therefore, the number of parts can be reduced, the cost can be reduced, and the assembly can be easily performed. be able to.

The resin body 25 has a cylindrical protrusion 325 as a part thereof, and the cylindrical protrusion 325 is located on the outer side in the radial direction of the substantially cup-shaped outer rotor 35. A portion of the outer rotor 32 is covered.

The resin body 25 has a first portion 331 and a second portion 332 located on both sides of the inner stator 31 in the axial direction, and the shaft of the first portion 331 does not face the outer rotor 32 in the axial direction. The thickness in the direction is greater than the thickness in the axial direction of the second portion 332 facing the outer rotor 32 in the axial direction. More specifically, the thickness of the portion of the first portion 331 facing the outer end portion in the radial direction of the inner stator 31 is the thickness of the portion of the second portion 332 facing the outer end portion of the inner stator 31 in the radial direction. It is thicker than the thickness.

On the other hand, the outer rotor 32 has a fixed portion 341 fixed to the rotating shaft 23 and a cylindrical portion 342 extending in the axial direction from an outer end portion in the radial direction of the fixed portion 341. A cylindrical protruding portion 325 that is a part of the resin main body 25 covers the outer side in the radial direction. The outer rotor 32 is formed entirely of a magnet material. However, although not shown, for example, a magnet may be attached to and embedded in the cylindrical portion of the outer rotor, and a part of the outer rotor may be formed of the magnet.

According to the motor 20 having the above-described configuration, the cylindrical protrusion 325 that is a part of the resin body 25 is located on the outer side in the radial direction of the cylindrical part 342 of the outer rotor 32 and is a part of the outer rotor. Since the cylindrical projection 325 covers the cylindrical portion 342, noise emitted to the outside from the motor 20 can be reduced, and when the outer rotor 32 is damaged, the fragments of the outer rotor 32 are externally exposed. Can be prevented from scattering.

In the first embodiment, the cylindrical protruding portion 325 that is a part of the resin body 25 covers the cylindrical portion 342 of the outer rotor 32 from the outside in the radial direction, but the protruding portion is not necessarily cylindrical. There is no need, and a cylindrical shape such as a rectangular tube shape or an elliptical cross section may be used, and the protruding portion may cover not only the cylindrical portion 342 of the outer rotor 32 but also a part of the outer rotor 32.

Even in this case, since a part of the resin main body 25 is located outside the outer rotor 32 in the radial direction and covers a part of the outer rotor 32, the resin covering a part of the outer rotor 32 is covered. The part of the main body 32 can reduce the noise emitted to the outside, and can prevent the outer rotor 32 from scattering to the outside when the outer rotor 32 is damaged.

Further, the resin main body 25 is integrally formed with the inner stator 31 and the coil 311, and the resin main body 25 forms an integrally formed structure that covers the inner stator 31 and the coil 311 without a gap. Thus, since it is an integrally molded structure with no gap, heat conduction is not hindered and heat dissipation is high. If there is a gap between the front case, the inner stator, and the coil as in the motor of Patent Document 1, an air layer is formed in the gap, the heat conduction is hindered, and the temperature of the motor rises. It happens.

The cylindrical portion 342 of the outer rotor 32 extends in the axial direction from the outer end portion in the radial direction of the fixing portion 341 fixed to the rotating shaft 23, and thus has a larger centrifugal force than the inner end portion in the radial direction of the fixing portion 341. There is no possibility of damage under the influence of force.

However, since the cylindrical protruding portion 325 that is a part of the resin main body 25 covers the cylindrical portion 342 of the outer rotor 32, the scattering can be prevented even if the cylindrical portion 342 is damaged.

In the resin main body 25, the axial thickness of the first portion 331 that does not face the outer rotor 32 in the axial direction out of the first portion 331 and the second portion 332 located on both sides in the axial direction of the inner stator 31. Is thicker than the axial thickness of the second portion 332 facing the outer rotor 32 in the axial direction. Accordingly, the first portion 331 that does not face the outer rotor 32 in the axial direction is less likely to be broken by heat than the second portion 332 (is less likely to be damaged), while the second portion 332 that faces the outer rotor 32 in the axial direction. Since the axial thickness is thinner than the axial thickness of the first part, the second part is more easily cracked (damaged) by heat than the first part.

However, the first portion 331 that faces the outside is difficult to crack, and the second portion 332 that faces the outer rotor 32 in the axial direction and does not face the outside is easy to crack. Therefore, even if the second portion 332 is cracked, the outer rotor 32 can reduce adverse effects to the outside. If the first portion 331 facing outside is broken, a large damage is immediately caused to the outside.

The back cover 26 that covers the outer rotor 32 from the axial direction is fixed to the tip of the cylindrical protrusion 325 of the resin body 25. The mounting surface 226 of the back cover 26 is mounted on the end surface 112 of the mounting base 10, and most of the back cover 26 protrudes on the opposite side of the mounting surface 226 from the resin body 25 side.

In this way, most of the back cover 26 protrudes on the side opposite to the resin main body 25 side than the mounting surface 226 of the back cover 26, so that the motor 20 is mounted from the mounting surface 226 of the back cover 26. The amount of protrusion toward the resin main body 25 can be reduced. As a result, the dimension from the end surface 112 of the mounting base 10 to the fan 21 can be reduced.

In the first embodiment, the mounting surface 226 of the back cover 26 is mounted on the end surface 112 of the mounting base 10, but the back cover is fixed inside the cylindrical protrusion 325 of the resin body 25 (not shown). ), An attachment surface that is the tip of the cylindrical protrusion 325 of the resin body 25 may be attached to the end surface 112 of the mounting base 10. Also in this case, the amount of protrusion of the motor from the mounting surface, which is the tip of the cylindrical protrusion 325 of the resin body 25, to the resin body 25 side can be reduced.

In FIG. 2, reference numeral 51 denotes a corrugated washer provided between the end face of the outer ring 28 b of the rolling bearing 28 on the rear surface side and the resin body 25, and the outer ring of the rolling bearing 28 on the rear surface side is provided by the corrugated washer 51. 28 b is biased in the axial direction toward the outer rotor 32.

Next, a method for assembling the motor 20 will be described with reference to FIG.

First, as shown in FIG. 5A, the one end 23b of the rotating shaft 23 is fixed to a boss 341 as a fixing portion which is a central portion of the outer rotor 32.

Next, as shown in FIG. 5B, the inner ring 28 a of the rolling bearing 28 on the anti-load side, that is, the rear surface side is press-fitted into the rotating shaft 23, and the end surface of the inner ring 28 a is connected to the boss portion 341 of the outer rotor 32. Abuts in the axial direction.

Next, as shown in FIG. 5C, an assembly including the outer rotor 32, the rotating shaft 23, and the rolling bearing 28 on the rear surface side shown in FIG. 5B is placed on the annular step portion 258 of the resin body 25 on the rear surface. The outer ring 28b of the side rolling bearing 28 is assembled into the resin main body 25 so as to be fitted with a clearance fit or a dead fit. At this time, the corrugated washer 51 is provided between the end surface of the annular step portion 258 of the resin body 25 and the end surface of the outer ring 28b of the rolling bearing 28 on the rear surface side.

Next, as shown in FIG. 5D, the inner ring 27 a of the rolling bearing 27 on the load side, that is, the front side is press-fitted into the rotating shaft 23, and the outer ring 27 b of the rolling bearing 27 on the front side is inserted into the resin body 25. The annular stepped portion 257 is fitted with a clearance fit or a dead fit.

Next, as shown in FIG. 5E, the back cover 26 is fixed to the resin body 25 by press fitting.

According to this assembling method, as shown in FIG. 5 (C), the assembly comprising the outer rotor 32, the rotating shaft 23, and the rolling bearing 28 on the rear surface side is incorporated into the resin body 25, so that it can be easily assembled.

Further, as shown in FIG. 5 (C), the outer ring 28b of the rolling bearing 28 on the rear surface side is fitted into the annular step portion 258 of the resin body 25 by a clearance fit or a dead fit, while FIG. 5 (D) shows. As described above, since the outer ring 27b of the rolling bearing 27 on the front surface side is fitted to the annular step portion 257 of the resin main body 25 by a gap fit or a dead fit, it can be easily assembled.

(Second Embodiment)
FIG. 3 is a sectional view showing the main part of the fan motor mounting structure according to the second embodiment of the present invention. 3, the same components as those of the fan motor mounting structure of the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals as those shown in FIGS. 1 and 2, and detailed description thereof is omitted. And about the same component, FIG. 1 and 2 are used as needed.

In the fan motor mounting structure of the second embodiment, as shown in FIG. 3, the motor 40 has the back cover 26, which is the back case of the first embodiment shown in FIGS. A rear end surface (attachment surface) 329 of a certain resin main body 25 is in direct contact with the end surface 112 of the mounting base 10 and is fixed to the mounting base 10 with screws 24 as in FIG. 1 of the first embodiment.

More specifically, a mounting surface 329 that is the tip of the cylindrical protruding portion 325 of the resin body 25 is attached to the end surface 112 of the mounting base 10, and a part of the motor 40 protrudes to the side opposite to the resin body 25 side. Yes.

As described above, the mounting surface 329 of the cylindrical protruding portion 325 of the resin body 25 is attached to the end surface 112 of the mounting base 10 so that a part of the motor 40 protrudes on the side opposite to the resin body 25 side. Thus, the amount of protrusion of the motor 40 from the mounting surface 329 of the resin body 25 toward the resin body 25 can be reduced. As a result, the dimension from the end surface 112 of the mounting base 10 to the fan 21 can be reduced.

According to the fan motor mounting structure of the second embodiment, the concave portion 13 of the mounting base 10 faces the back surface of the motor 40, and the concave portion 13 increases the rigidity of the mounting base 10. Therefore, noise and vibration can be reduced.

Further, since the concave portion 13 has a function of blocking noise from the motor 40, noise can be reduced.

Further, although the motor 40 itself does not have a back case as a back cover, the recess 13 of the mounting base 10 also functions as a back cover of the motor 40, so that foreign matter can be prevented from entering the motor 40. And it does not compromise safety.

Further, the motor 40 itself does not have a back case as a back cover, and the recess 13 covers the back side of the motor 40, and the volume in the recess 13 is the back surface of the back case of the first embodiment. Since it is larger than the volume of the cover 26, the heat dissipation of the motor 40 is improved.

Further, according to the second embodiment, the conventional back cover for the motor itself can be omitted, and the number of parts can be reduced and the cost can be reduced.

(Third embodiment)
FIG. 4 is a sectional view showing the main part of the fan motor mounting structure according to the third embodiment of the present invention. In FIG. 4, the same components as those of the fan motor mounting structure of the second embodiment shown in FIG. 3 are denoted by the same reference numerals as those of the components shown in FIG.

In the fan motor mounting structure of the third embodiment, as shown in FIG. 4, between the rear end surface (mounting surface) 329 of the resin body 25 as the front case of the motor 40 and the mounting base 10, for example, an O-ring or the like The sealing member 41 is provided to seal the rear end surface 329 of the resin main body 25, that is, the back side of the motor 40 and the mounting base 10.

In the third embodiment, since the seal member 41 is provided between the back side of the motor 40 and the mounting base 10, entry of foreign matter into the motor 40 can be reliably prevented.

Although not shown, the resin body 25 may be insert-molded together with the metal support member, and the front and rear rolling

bearings

27 and 28 may be supported by the resin body 25 via the metal support member.

At this time, the resin body side is a concept including not only the resin body 25 but also the metal support member inserted in the resin body 25.

Of course, the constituent elements described in the first to third embodiments and modifications may be combined as appropriate, and may be selected, replaced, or deleted as appropriate.

DESCRIPTION OF SYMBOLS 10 Mounting base 13

Recess

20, 40 Motor 21 Fan 23 Rotating shaft 25 Resin body 26

Back cover

27, 28 Rolling bearing 27a, 28a

Inner ring

27b, 28b Outer ring 31 Inner stator 32 Outer rotor 41 Seal member 325 Cylindrical protrusion 331 First 1 part 332 2nd part 342 Cylindrical part 226,329 Mounting surface

Claims

A resin body (25) holding the inner stator (31);
An outer rotor (32) rotating around the inner stator (31);
A rotating shaft (23) having one end fixed to the outer rotor (32);
A front-side and a rear-side rolling bearing (27, 28) for rotatably supporting the rotating shaft (23);
Outer rings (27b, 28b) of the rolling bearings (27, 28) on the front side and the rear side are supported on the resin body (25) side,
A motor, wherein a part of the resin main body (25) is located outside the outer rotor (32) in the radial direction and covers a part of the outer rotor (32).
The motor according to claim 1,
The outer rotor (32) includes a fixed portion (341) fixed to the rotating shaft (23) and a cylindrical portion (342) extending in the axial direction from an outer end portion in the radial direction of the fixed portion (341). Have
The motor characterized in that the part of the resin body (25) covers the cylindrical part (342).
The motor according to claim 1 or 2,
The resin body (25) has a first portion (331) and a second portion (332) located on both sides in the axial direction of the inner stator (31), and is axially disposed on the outer rotor (32). The motor is characterized in that the axial thickness of the first portion (331) that does not face is greater than the axial thickness of the second portion (332) that faces the outer rotor (32) in the axial direction. .
The motor according to any one of claims 1 to 3,
A back cover (26) covering the outer rotor (32) from the axial direction is fixed to the resin body (25),
The back cover (26) is more than the resin body (25) than the back cover (26) attached to the end surface (112) of the mounting base (10) or the attachment surface (226, 329) of the resin body (25). A motor characterized by protruding on the opposite side to the side.
The motor according to any one of claims 1 to 4,
An inner ring (28a) of the rolling bearing (28) on the rear surface side is in contact with the outer rotor (32) in the axial direction.
The motor according to any one of claims 1 to 5,
The outer rings (27b, 28b) of the rolling bearings (27, 28) on the front side and the rear side are fitted into the resin main body (25) with a gap or a dead fit,
An inner ring (27a, 28a) of the rolling bearings (27, 28) on the front side and the rear side is press-fitted into the rotating shaft (23).
A fan motor (200) comprising the motor (20, 40) according to any one of claims 1 to 6 and a fan (21);
A mounting base (10) to which the motor (20, 40) is mounted;
The motor (20, 40), which is the other end of the rotating shaft (23) opposite to the one end of the rotating shaft (23) of the motor (20, 40) to which the fan (21) is attached. The fan motor mounting structure, wherein the part of the mounting base (10) facing the back side is a recess (13) recessed from the motor (20, 40) side.
In the fan motor mounting structure according to claim 7,
The recessed portion (13) of the mounting base (10) also serves as a back cover of the motor (40).
The fan motor mounting structure according to claim 7 or 8,
A fan motor mounting structure comprising a seal member (41) for sealing between the mounting base (10) and the back side of the motor (40).
A fan motor (200) having a motor (20, 40) and a fan (21);
A mounting base (10) to which the motor (20, 40) is mounted;
The motor (20, 40), which is the other end of the rotating shaft (23) opposite to the one end of the rotating shaft (23) of the motor (20, 40) to which the fan (21) is attached. The fan motor mounting structure, wherein the part of the mounting base (10) facing the back side is a recess (13) recessed from the motor (20, 40) side.
In the fan motor mounting structure according to claim 10,
The recessed portion (13) of the mounting base (10) also serves as a back cover of the motor (40).
In the fan motor mounting structure according to claim 11,
A fan motor mounting structure comprising a seal member (41) for sealing between the mounting base (10) and the back side of the motor (40).
The fan motor mounting structure according to any one of claims 10 to 12,
The fan motor mounting structure, wherein the motors (20, 40) of the fan motor (200) are outer rotor type motors.
In the fan motor mounting structure according to claim 13,
The motor (20, 40)
A resin body (25) holding the inner stator (31);
An outer rotor (32) rotating around the inner stator (31);
A rotating shaft (23) having one end fixed to the outer rotor (32);
A front-side and a rear-side rolling bearing (27, 28) for rotatably supporting the rotating shaft (23);
The fan motor mounting structure characterized in that the outer rings (27b, 28b) of the rolling bearings (27, 28) on the front side and the rear side are supported on the resin body (25) side.
In the fan motor mounting structure according to claim 14,
A fan motor mounting structure, wherein an inner ring (28a) of the rolling bearing (28) on the rear surface side is in contact with the outer rotor (32) in the axial direction.
The fan motor mounting structure according to claim 14 or 15,
The outer rings (27b, 28b) of the rolling bearings (27, 28) on the front side and the rear side are fitted into the resin main body (25) with a gap or a dead fit,
A fan motor mounting structure, wherein inner rings (27a, 28a) of the rolling bearings (27, 28) on the front side and the rear side are press-fitted into the rotary shaft (23).