JPH09140092A - Built-in fan type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fan of a built-in fan type motor from the application of an excessive pressure thereto and simplify the configuration of its bearing portion. SOLUTION: Between attaching frames 23, 24 on a frame 22, a motor portion 26 is provided integrally with a fan 27. The motor portion 26 comprises both a stator 31 with a winding 30 wound around a stator core 29 which is fastened to a bracket 28 provided on the attaching frame 24 and a rotor 32 having a permanent magnet 34 via a rotor yoke 33 whose shaft 35 is held in a rotatable way by a roller bearing 36 provided in the bracket 28. A shaft 39 provided in an end plate 37 of the fan 27 provided integrally with the rotor 32 is held in a rotatable way by a sliding bearing 40 provided in the attaching frame 23. Forming the attaching frame 24 out of a ferromagnetic material, it is arranged to the permanent magnet 34 with a small gap between them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan-integrated motor which integrally has a rotor having a permanent magnet at one axial end of a substantially cylindrical fan.

[0002]

As a conventional example of a fan-integrated motor integrally provided with a cylindrical fan such as a cross flow fan, there is one disclosed in JP-A-62-104452. As shown in FIG. 9, this one has an outer rotor type motor unit 2 at a right end portion on a frame 1.
Has a configuration in which the rotational axis direction is the lateral direction, and extends laterally from the motor portion 2 to the left, and is integrally configured with a lateral flow fan 3 made of, for example, plastic.

Specifically, the motor section 2 is constructed as follows. That is, the mounting frame 4 rising to the right end of the frame 1 is provided with a bracket 5 protruding leftward in the drawing, and the winding 7 is wound around the stator core 6 on the outer peripheral portion of the bracket 5. The stator 8 formed as described above is fixed. On the other hand, the rotor 9 has a permanent magnet 11 on the inner peripheral surface of the rotor yoke 10 that faces the stator core 6 in the radial direction.
A shaft 12 fixed to the center of the rotor 9 is rotatably supported by a rolling bearing (ball bearing) 13 provided on the bracket 5.

The cross-flow fan 3 has a configuration in which one (right) end plate is also used as the rotor 9, and a plurality of air blowers are provided between the rotor 9 and the left end plate 14. It is configured to have the blades 15 hooked around it. At this time, the end plate 14 has the shaft 1 at the center of the outer surface side.
6, a shaft 16 of which is rotatably supported by a rolling bearing 18 provided on a mounting frame 17 rising at the left end of the frame 1. A preload spring 19 is provided on the rolling bearing 18 portion.

In the above-mentioned conventional one, the preload spring 19 is provided as the thrust preload source for suppressing the rattling of the fan 3. However, this preload causes a load of, for example, about 30 N to act on the entire fan 3, and in order to prevent the fan 3 from bending and generating noise, the fan 3 itself is made of a high-strength material. There was a problem I had to do. Further, in order to receive such a thrust load, there is a problem in the life of the slide bearing, so the rolling bearing 1 which is more expensive than the slide bearing 1
Since 3,18 had to be used for all the bearings, there was a problem that the cost was high.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a fan-integrated type which can prevent an excessive pressure from being applied to the fan and can simplify the structure of the bearing portion. To provide a motor.

[0007]

A first fan-integrated motor according to the present invention integrally comprises a rotor having a permanent magnet on one axial end of a substantially cylindrical fan. A first bearing portion that rotatably supports the rotor, a second bearing portion that rotatably supports the other axial end of the fan, and a permanent magnet of the rotor. A stator in which a winding is wound around a stator iron core, and a magnetic attraction of the permanent magnet, which is arranged on this stator side with an axial gap to the permanent magnet of the rotor. And a rotor suction portion made of a ferromagnetic material that exerts an attraction force in the axial direction on the rotor by force (the invention of claim 1).

In this case, the first bearing portion can be formed of a rolling bearing, and the second bearing portion can be formed of a slide bearing (claim 2). Further, the rotor suction portion may be formed of a mounting frame made of a ferromagnetic material for supporting the stator (claim 3).
Invention), and a magnetic substrate for a drive circuit (invention of claim 4).

A second fan-integrated motor according to the present invention integrally comprises a rotor having a permanent magnet at one axial end of a substantially cylindrical fan. A first bearing portion that rotatably supports the fan, and a second bearing portion that rotatably supports the other axial end of the fan.
A stator core provided so as to face the permanent magnet of the rotor in a radial direction, and a stator having a winding wound around the stator core, and the axial center position of the permanent magnet and the stator. A feature is that the axial center position of the iron core is shifted in the axial direction (the invention of claim 5).

Also in this case, the first bearing portion can be formed of a rolling bearing, and the second bearing portion can be formed of a slide bearing (invention of claim 6). If the axial length dimension of the permanent magnet is configured to be larger than the axial length dimension of the stator core,
It is more effective (the invention of claim 7).

According to the fan-integrated motor of the first aspect of the present invention, since the rotor attracting portion made of a ferromagnetic material is arranged with respect to the permanent magnet of the rotor via the axial gap, The magnetic attraction force between the magnet and the rotor attraction portion causes the rotor to receive an attraction force in the axial direction with respect to the stator. Therefore, even without using a preload spring or the like, preload can be applied between the outer ring and the inner ring of the first bearing portion by the suction force, and rattling of the fan can be prevented. At this time, since an excessive load does not act on the fan and the second bearing portion side, the fan does not need to be made of a material having high strength, and the life of the second bearing portion can be extended.

In this case, as described above, the first bearing portion needs to receive the load due to the preload, but the second bearing portion does not receive an excessive load. Therefore, if the first bearing portion is formed of a rolling bearing and the second bearing portion is formed of a slide bearing (a fan integrated motor according to claim 2), the life of the first bearing portion can be secured. At the same time, the structure of the second bearing portion can be inexpensive.

Of course, the rotor suction part can be provided as a separate member made of a ferromagnetic material, but the rotor suction part is made of a ferromagnetic material for supporting the stator. Or by (claim 3
Fan-integrated motor according to claim 4) or a magnetic substrate for a drive circuit (fan-integrated motor according to claim 4),
It is possible to further simplify the configuration.

According to the fan integrated motor of claim 5 of the present invention, the axial center position of the permanent magnet of the rotor and the axial center position of the stator core radially opposed to the permanent magnet. Is shifted in the axial direction, the magnetic attraction force in the axial direction of the permanent magnet acts on the stator core in the direction in which the axial center positions are aligned.
Therefore, without using a preload spring or the like, preload can be applied between the outer ring and the inner ring of the first bearing portion by the magnetic attraction force thereof, and rattling of the fan can be prevented. At this time, since an excessive load does not act on the fan and the second bearing portion side, the fan does not need to be made of a material having high strength, and the life of the second bearing portion can be extended.

Also in this case, if the first bearing portion is formed of a rolling bearing and the second bearing portion is formed of a sliding bearing (fan integrated motor of claim 6), the life of the first bearing portion is reduced. Can be secured and the second
Therefore, the structure of the bearing portion can be made inexpensive. If the axial length of the permanent magnet is made larger than the axial length of the stator core (fan integrated motor according to claim 7), the axial length of the permanent magnet and the stator core can be increased. A larger magnetic attraction force in the axial direction can be obtained and a larger preload can be applied as compared with the case where the dimensions are almost the same.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Several embodiments in which the present invention is applied to a fan-integrated motor for an air conditioner indoor unit will be described below. (1) First Example First, a first example of the present invention (corresponding to claims 1 to 3) will be described with reference to FIGS. 1 to 3.

FIG. 3 shows the entire structure of the fan-integrated motor section 21 according to this embodiment. On the frame 22 extending in the left-right direction in the figure, the mounting frame is located at both left and right ends thereof. 23 and 24 are provided in an upright shape via the anti-vibration rubbers 25 and 25. The motor unit 2 is located between the left and right mounting frames 23, 24 on the right end side in the drawing.
6 is provided, and a lateral flow type fan 27 made of, for example, plastic is integrally provided so as to extend to the left from the motor section 26.

The motor portion 26 is provided in a form in which outer rotor type motors are arranged in a horizontal direction with respect to the rotational axis direction. That is, as shown in FIG. 1 and FIG. 2, the mounting frame 24 is provided with a substantially cylindrical bracket 28 so as to project leftward in the drawing, and the stator is attached to the outer peripheral portion of the bracket 28. A stator 31 formed by winding a coil 30 around an iron core 29 is fixed.

On the other hand, the rotor 32 is in the shape of a cylindrical container whose right side is open in the figure, and the rotor yoke 33 is formed on the inner peripheral surface thereof.
The permanent magnets 34 of, for example, a ferrite system are provided so as to alternately have different poles in the circumferential direction. A shaft 35 extending inward (to the right) is fixed to the central portion of the rotor 32, and the shaft 35 is a rolling bearing (ball bearing, which is a first bearing portion provided at the tip of the bracket 28). A bearing 36 is rotatably supported.

In this case, as is well known, the rolling bearing 36 has a ball or the like between the inner ring and the outer ring, of which the outer ring is fitted and fixed to the tip of the bracket 28, and the shaft 35 is inserted and fixed to the inner ring. Thus, the rotor 32 is rotatably provided with respect to the stator 31, and at this time, the permanent magnet 34 and the stator core 29 are arranged so as to face each other in the radial direction with an air gap. It is like this. The winding 30
A driving circuit (not shown) causes a predetermined current to flow therethrough to form a rotating magnetic field. The rotor 32 is rotated by the action of the rotating magnetic field and the permanent magnet.

Then, as shown in FIG. 3, the fan 2
7, one (right) end plate is also used as the left wall portion of the rotor 32, and a plurality of blower blades 38 are hung between the rotor 32 and the left end plate 37. It is configured to have a hand-over, and has a substantially cylindrical shape as a whole. At this time, a shaft 39 extending leftward is fixed to the center of the end plate 37, and the shaft 39 is attached to a slide bearing 40 which is a second bearing portion provided on the left mounting frame 23. It is rotatably supported.

Now, in this embodiment, the stator 3
The mounting frame 24 on the right side for supporting 1 is made of a ferromagnetic material such as a rolled steel plate. As shown in FIG. 1, the mounting frame 24 is arranged in the axial direction with respect to the permanent magnet 34 with a gap of a slight dimension a therebetween.

Thus, the mounting frame 24 functions as a rotor attracting portion, and the mounting frame 24 for the permanent magnet 34 is mounted.
Due to the magnetic attraction between the rotor 32 and the stator 31,
Therefore, a suction force (indicated by an arrow A in FIG. 2) in the axial direction is received. In this case, the permanent magnet 34
The outer diameter (diameter) is 75 mm, while the gap size a is about 1 mm.

Next, the operation of the above configuration will be described. As shown in FIG. 2, most of the magnetic flux emitted from the permanent magnet 34 of the rotor 32 becomes the effective magnetic flux B that links the stator core 29, and contributes to the rotation of the rotor 32. The remaining part of the magnetic flux becomes a leakage magnetic flux C and circulates while detouring in the axial direction. In the above structure, since the mounting frame 24 made of a ferromagnetic material is arranged so as to face the permanent magnet 34 in the axial direction, the leakage magnetic flux C passes through the mounting frame 24, and The magnetic attraction force causes the rotor 32 to receive the attraction force A in the axial direction with respect to the stator 31.

As a result, the suction force A causes a preload to be applied between the outer ring and the inner ring of the rolling bearing 36 that supports the shaft 35 of the rotor 32.
It is possible to prevent rattling in the axial direction of 7. By the way, in this embodiment, the gap dimension a is set to about 1 mm in accordance with the rating of the rolling bearing 36, etc., so that a sufficient preload of about 15 N can be obtained. The preload can be adjusted from several times to several times by adjusting the gap size a.

Further, with this structure, the preload spring and the like which have been conventionally required are no longer required. Then, at this time, the preload can be sufficiently received by the rolling bearing 36, and an excessive load does not act on the fan 27.
Since an excessive load does not act on the slide bearing 40 side, the bearing structure on the other end side of the fan 27 can be replaced with a rolling bearing, which is conventionally necessary, instead of a relatively inexpensive slide bearing 40.
Was able to be adopted.

As described above, according to this embodiment, the permanent magnet 3
4, the rotor suction portion (mounting frame 24) is provided through the axial gap, so that a sufficient preload can be applied without the need for the preload spring 19 which has been conventionally required. became. Since the first bearing portion on the side of the rotor 32 is composed of the rolling bearing 36, the load due to the preload can be received by the rolling bearing 36, and excessive pressure is applied to the fan 27 and the second bearing portion. Can be prevented.

As a result, unlike the prior art in which the preload is applied by the preload spring 19, an excessive load is not applied to the fan 27, so that the noise caused by the bending of the blower blade 38 is prevented. At the same time, the fan 27 itself does not have to be made of a material having a high rigidity, so that the fan 27 can be inexpensively constructed and the weight can be reduced.

Even if the second bearing portion is composed of the slide bearing 40, a sufficiently long life can be obtained, and the conventional preload spring 19 is not required, and the structure of the entire bearing portion is simple. It is possible to reduce the cost. Further, particularly in this embodiment,
Since the rotor suction portion can be obtained by forming the mounting frame 24 originally required for supporting the stator 31 from a ferromagnetic material, the structure can be further simplified. is there.

(2) Second Embodiment FIG. 4 shows a second embodiment (corresponding to claim 4) of the present invention. This embodiment is different from the first embodiment in that the rotor suction portion is composed of a magnetic substrate for a drive circuit. For this reason, the same parts as those of the first embodiment, such as the configuration of the rotor 32, are designated by the same reference numerals and detailed description thereof will be omitted.

In the present embodiment, the right mounting frame 41 is made of, for example, plastic, and the stator 3 is attached to the bracket 42 provided on the mounting frame 41.
1 is attached. And, in the bracket 42,
An iron substrate 43, which is a magnetic substrate made of a ferromagnetic material, is provided in parallel with the mounting frame 41. A drive circuit and the like are provided on the iron substrate 43. In this case, the iron substrate 43 is arranged in the axial direction with respect to the permanent magnet 34 of the rotor 32 via a gap having a slight dimension b,
It functions as a rotor suction unit. The gap dimension b is 1.2 mm, for example.

In this structure as well, as in the first embodiment, the magnetic attraction of the permanent magnets 34 to the iron substrate 43 causes the rotor 32 to receive the attraction in the axial direction with respect to the stator 31. And by its suction power,
Rolling bearing 36 that supports the shaft 35 of the rotor 32
Preload is applied between the outer ring and the inner ring. Therefore, it is possible to prevent excessive pressure from being applied to the fan 27, simplify the overall structure of the bearing portion, and compare with the case where a rotor suction portion is provided as a separate member. Therefore, it is possible to obtain the effect that the configuration is simple.

(3) Third Embodiment Next, a third embodiment of the present invention (corresponding to claims 5 and 6) will be described with reference to FIGS. Also in this embodiment, with respect to the same parts as those of the first embodiment,
The same reference numerals will be given and detailed description thereof will be omitted.
The points different from the embodiment will be mainly described.

In the present embodiment, the mounting frame 52 on the side of the motor portion 51 is made of, for example, plastic, and the bracket 2 provided on this mounting frame 52.
A stator 31 formed by winding a winding 30 around a stator core 29 is fixed to the outer peripheral portion of the stator 8. On the other hand, on the inner peripheral surface of the rotor 32, a permanent magnet 53 facing the stator core 29 is provided.
Is provided via the rotor yoke 33. In this case, the permanent magnet 53 has an axial length dimension substantially equal to that of the stator core 29.

The shaft 35 of the rotor 32 is rotatably supported by the rolling bearing 36 provided on the bracket 28. At this time, as shown in FIG. 5 and FIG. The axial center position of 53 is
It is displaced from the axial center position of the stator core 29 by a slight dimension c in the axial direction (left side in the drawing). Incidentally, as shown in FIG. 7, the shaft 3 on the side of the other end plate 37 of the fan 27 is
9 is a slide bearing 40 provided on the mounting frame 23.
Supported by

In such a configuration, as shown in FIG. 6, since the permanent magnet 53 and the stator core 29 are axially displaced, the magnetic flux D generated from the permanent magnet 53 is axially displaced. It works diagonally instead of vertically. Due to the inclination of the magnetic flux D, the radial component of the magnetic attraction force between the permanent magnet 53 and the stator core 29 is canceled by the entire circumference of the permanent magnet 53, but the axial component is all permanent. The permanent magnets 53 act in the same direction in the magnets 53.
The magnetic attraction force acts in a direction to eliminate the gap between the stator core 29 and the stator core 29. The rotor 32 is now the stator 31
Therefore, the suction force E in the axial direction is received. Therefore, the suction force E provides a preload between the outer ring and the inner ring of the rolling bearing 36 that supports the shaft 35 of the rotor 32.

As a result, also in the present embodiment, the first
Unlike the conventional example in which the preload is applied by the preload spring 19, an excessive load is not applied to the fan 27, so that the noise caused by the bending of the blower blade 38 is not generated. While preventing it, the fan 27 itself does not have to be made of a material having high rigidity, and thus the fan 27 can be inexpensively constructed and can be reduced in weight.

Even if the second bearing portion is composed of the slide bearing 40, a sufficiently long service life can be obtained, and the conventional preload spring 19 is not required. It is possible to reduce the cost. Further, particularly in this embodiment,
The permanent magnet 53 and the stator core 29 can be displaced in the axial direction with a very simple structure.

(4) Fourth Embodiment Finally, FIG. 8 shows a fourth embodiment of the present invention (corresponding to claim 7). This embodiment differs from the third embodiment described above in that the axial length of the permanent magnet 54 is larger than the axial length of the stator core 29. Also in this case, the axial center position of the permanent magnet 54 is displaced from the axial center position of the stator core 29 by a slight dimension d in the axial direction (left side in the drawing).

According to this structure, the same action and effect as those of the third embodiment can be obtained. In addition to this, the permanent magnet 5
As compared with the configuration of the third embodiment in which the axial length dimensions of the stator core 3 and the stator core 29 are substantially the same, the amount of magnetic flux emitted from the permanent magnet 54 is increased, and a larger magnetic attraction force in the axial direction is obtained. It can be obtained and a large preload can be given.

The present invention is not limited to the above-described embodiment shown in the drawings. For example, the rotor suction portion may be provided as a separate member on the stator side,
Further, the present invention can be applied not only to the cross-flow fan but also to a sirocco fan and the like, and further, it can be used not only for the air conditioner but also for various purposes, etc., and can be appropriately modified and implemented without departing from the spirit of the invention. It is a thing.

Further, instead of a radial gap type, an axial gap type is formed so that the outer peripheral side or both sides of the permanent magnet come out to the inside and outside of the winding, and that portion and the rotor attracting portion exert a magnetic attraction force. It is also possible to adopt a configuration that allows it.

[0043]

As is apparent from the above description, the present invention has the following excellent effects. That is, according to the fan-integrated motor of the first aspect, since the rotor attracting portion made of a ferromagnetic material is arranged with a gap in the axial direction with respect to the permanent magnet of the rotor, excessive pressure is applied to the fan. The bearing can be prevented from being applied, the structure of the bearing portion can be simplified, and the cost can be reduced, the weight can be reduced, and the service life can be extended.

In this case, if the first bearing portion is formed of a rolling bearing and the second bearing portion is formed of a slide bearing (a fan integrated motor according to claim 2), the life of the first bearing portion is secured. In addition to the above, the structure of the second bearing portion can be inexpensive. Further, the rotor suction portion may be formed of a mounting frame made of a ferromagnetic material for supporting the stator (a fan integrated motor according to claim 3) or a magnetic substrate for a drive circuit (claim). If the fan-integrated motor of item 4) is used, the structure can be further simplified.

According to the fifth aspect of the present invention, in the fan-integrated motor, the axial center position of the permanent magnet of the rotor and the axial center position of the stator core radially opposed to the permanent magnet are provided. Since it has been shifted in the axial direction, it is possible to prevent excessive pressure from being applied to the fan, and it is possible to simplify the structure of the bearing unit, which in turn reduces costs, reduces weight, and prolongs service life. It can be achieved.

Also in this case, if the first bearing portion is formed of a rolling bearing and the second bearing portion is formed of a slide bearing (fan integrated motor of claim 6), the life of the first bearing portion is reduced. Can be secured and the second
Therefore, the structure of the bearing portion can be made inexpensive. If the axial length of the permanent magnet is made larger than the axial length of the stator core (fan integrated motor according to claim 7), the axial length of the permanent magnet and the stator core can be increased. A larger preload can be applied as compared with the case where the dimensions are almost the same.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional front view of essential parts showing a first embodiment of the present invention.

FIG. 2 is an enlarged vertical side view showing a permanent magnet portion.

FIG. 3 is a vertical sectional front view showing the entire configuration.

FIG. 4 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 5 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;

FIG. 6 is a view corresponding to FIG.

FIG. 7 is a diagram corresponding to FIG. 3;

FIG. 8 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 9 is an overall vertical sectional side view showing a conventional example.

[Explanation of symbols]

In the drawing, 21 is a fan integrated motor, 23, 24, 4
1, 52 are mounting frames, 26, 51 are motor parts, 2
7 is a fan, 28 and 42 are brackets, 29 is a stator core, 30 is a winding wire, 31 is a stator, 32 is a rotor, 34,
53 and 54 are permanent magnets, 35 is a shaft, 36 is a rolling bearing (first bearing portion), 30 is a sliding bearing (second bearing portion), and 43 is an iron substrate (magnetic substrate).

Claims (7)

[Claims] 1. A first bearing portion for rotatably supporting the rotor side, wherein a rotor having a permanent magnet is integrally provided at one axial end of a substantially cylindrical fan. A second bearing portion that rotatably supports the other end of the fan in the axial direction, and a stator core provided so as to face the permanent magnet of the rotor. A rotor and a stator are disposed on the side of the stator through an axial gap with respect to the permanent magnet of the rotor, and a magnetic attraction force of the permanent magnet exerts an attraction force in the axial direction on the rotor. And a rotor suction unit made of a ferromagnetic material. 2. The fan integrated motor according to claim 1, wherein the first bearing portion is a rolling bearing, and the second bearing portion is a sliding bearing. 3. The fan-integrated motor according to claim 1, wherein the rotor suction portion is composed of a mounting frame made of a ferromagnetic material for supporting the stator. 4. The fan-integrated motor according to claim 1, wherein the rotor suction portion is composed of a magnetic substrate for a drive circuit. 5. A rotor having a cylindrical permanent magnet integrally provided at one axial end of a substantially cylindrical fan, wherein the rotor side is rotatably supported. Bearing part, a second bearing part that rotatably supports the other end side of the fan in the axial direction, and a stator core provided so as to face the permanent magnet of the rotor in a radial direction. A fan-integrated motor comprising a wound stator, wherein an axial center position of the permanent magnet and an axial center position of the stator core are axially displaced. 6. The fan-integrated motor according to claim 5, wherein the first bearing portion is a rolling bearing, and the second bearing portion is a sliding bearing. 7. The fan-integrated motor according to claim 5, wherein the permanent magnet has an axial length dimension larger than an axial length dimension of the stator core.