JP2002064957A - Motor cooling structure for motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more effectively cool the heating part in a motor, located on the side of one end of the output shaft thereof by the air taken from the side of the other end. SOLUTION: An air flow path 29 for guiding cooling air from the side of the base 20a of the output shaft 20 to a brush 28 and a commutator 25 located on the side of the tip 20b is formed inside the motor portion 12 integrally formed on the base 11 of a blower unit 10. The air flow path 29 is formed by the inner circumferential face 17a of a yoke 17, the circumferential end faces 18a of two field magnets 18 adjacent to each other in the circumferential direction, and the outer circumferential face 21a of an armature 21 so that the air flow path extends in the direction of the axis of the output shaft 20. Owing to the air flow path 29, the brush 28 and the commutator 25, which are not otherwise cooled by directly letting the air in the blower case 13 from the tip 20b of the output shaft 20 into the motor portion 12, are effectively cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor cooling structure for a motor device such as a blower unit used in a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, in many cases, a brush type DC motor is used as a drive source in a blower unit of a vehicle air conditioner. Since the blower unit is continuously operated at a high output, frictional heat is generated due to sliding contact between the brush and the commutator, and the temperature of the motor increases mainly around the brush and the commutator. For this reason, it is necessary to cool the motor in order to suppress the abrasion of the brush due to the temperature rise to secure the life, and to suppress the increase in the contact resistance to prevent the output from lowering.

For this reason, for example, in a vehicle blower disclosed in Japanese Utility Model Application No. 5-64290, a blower member 52 is provided between a blower case 50 and a motor housing 51 as shown in FIG.
To send the cooling air from the blower case 50 to the motor housing 51.

[0004]

However, in the above-described air blower for a vehicle, since only cooling air is supplied into the space 54 provided between the motor accommodating portion 51 and the motor 53, heat is generated. The source brush and commutator cannot be cooled effectively. For this reason, it was not possible to sufficiently suppress the wear of the brush and the decrease in output.

[0005] In the brush type DC motor, noise is generated due to sliding contact between the brush and the commutator. Therefore, many blower units use a DC motor provided with a brush and a commutator on the fan side and arrange a noise generation source in a blower case to shield the noise. However, in the structure of the above-described vehicle blower, it is not possible to cool the brush and the commutator by directly introducing cooling air from the blower case into the motor body. Therefore, the brush and the commutator could not be cooled more effectively.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a motor body having a heat-generating portion provided at one end of an output shaft with respect to the motor body. It is an object of the present invention to provide a motor cooling structure of a motor device that can take in air from a side and more effectively cool the air.

[0007]

According to a first aspect of the present invention, there is provided a motor cooling structure for a motor device in which a motor body has a heat generating portion at one end of an output shaft thereof. The gist of the invention is that an air flow path for guiding cooling air introduced from the other end of the output shaft to the heat generating portion is formed by a constituent member of the motor main body inside the main body.

According to the first aspect of the present invention, the cooling air introduced into the motor body from the other end of the output shaft is supplied to one end of the output shaft by the air flow path formed by the constituent members of the motor body. It is guided to a certain heating part, and cools the heating part on one end side. Therefore, even in a motor device in which cooling air cannot be directly introduced into the motor main body from one end of the output shaft, the heat generating portion on one end of the output shaft is effectively cooled.

According to a second aspect of the present invention, in the motor cooling structure for a motor device according to the first aspect, the motor body is a brush type DC motor, and the heat generating portion is a brush and a commutator; The air flow path is formed by an inner peripheral surface of a cylindrical yoke, an end surface that is circumferentially opposed to both field magnets that are circumferentially adjacent to each other while being fixed to the inner peripheral surface, and an outer peripheral surface of the armature. A motor cooling structure for a motor device, wherein the motor cooling structure is formed so as to extend in the axial direction of the output shaft.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the effect of the invention described in the above, the cooling air introduced from the other end of the output shaft to the motor body of the brush DC motor,
The axis of the output shaft formed by the inner peripheral surface of the cylindrical yoke, the end surfaces of the two field magnets that are circumferentially adjacent to each other and are fixed in the inner peripheral surface and oppose each other in the peripheral direction, and the outer peripheral surface of the armature. The brush and the commutator, which are heat generating parts, are guided through an air flow path formed to extend in the direction, and cool the brush and the commutator. Therefore, in a motor device in which cooling air cannot be directly introduced into the motor main body from one end of the output shaft, the brush and the commutator at one end of the output shaft are effectively cooled.
As a result, the brush and the commutator of the brush type DC motor cannot be cooled directly, so that the brush and the commutator can be effectively cooled, the wear of the brush due to the temperature rise is suppressed, and the life is prolonged. An increase in contact resistance can be suppressed, and a decrease in output can be suppressed.

According to a third aspect of the present invention, in the cooling structure of the motor device according to the second aspect, the air flow path is provided at a position overlapping the brush when viewed in the axial direction of the output shaft. That is the gist.

According to the invention described in claim 3, according to claim 2,
In addition to the operation of the invention described in the above, the cooling air introduced into the motor main body from the other end side of the output shaft is guided in the axial direction of the output shaft by the air flow path, and the cooling air is directly Reach a brush and cool. Therefore, the flow rate of the cooling air when reaching the brush is hardly reduced and the temperature is hardly increased, so that the brush is cooled more effectively.

According to a fourth aspect of the present invention, in the motor cooling structure for a motor device according to the third aspect, the air flow path faces downward when the motor device is installed in a predetermined posture. The gist is to introduce air from outside of the motor main body through an air intake port provided in the motor main body so as to open.

According to the invention described in claim 4, according to claim 3,
In addition to the effects of the invention described in (1), it is difficult for water to enter the motor main body from the air intake when the motor device is installed. Therefore, the motor body is unlikely to be affected by water that has entered from the outside.

According to a fifth aspect of the present invention, in the motor cooling structure for a motor device according to the fourth aspect, the number of the air intakes is one, and the air intakes are provided for each of the plurality of brushes. The gist of the present invention is that it is communicated with the air flow path provided in the above.

According to the invention set forth in claim 5, according to claim 4,
In addition to the effect of the invention described in (1), the size of the motor body having the air intake is smaller than when the air intake is provided for each air flow path.

According to a sixth aspect of the present invention, in the motor cooling structure for a motor device according to any one of the second to fifth aspects, the motor device includes a centrifugal fan at one end of the output shaft. It is a blower unit in which the motor main body is fixed to a fixed housing housing the centrifugal fan, wherein the brush and the commutator are arranged in the housing.

According to the invention described in claim 6, according to claim 2,
The brush and the commutator are arranged in the housing in which the centrifugal fan fixed to one end of the output shaft of the motor body is accommodated, in addition to the operation of the invention according to any one of claims 5 to 5, The noise generated by the sliding contact between the brush and the commutator is shielded. Thus, the brushes and commutators located in the housing for shielding noise are effectively cooled.

According to a seventh aspect of the present invention, in the motor cooling structure for a motor device according to any one of the first to sixth aspects, the motor body is provided with one end of the output shaft. The gist of the present invention is to provide an air discharge hole for communicating the inside of the motor body with the outside so that air inside the motor body can be released to the outside.

According to the invention of claim 7, according to claim 1,
In addition to the effect of the invention described in any one of the above-described claims, the air that has cooled the heat generating portion is discharged to the outside of the motor main body from the cooling air discharge portion provided at one end of the output shaft. Accordingly, the supply of new cooling air to the heat generating portion is promoted, and the heat generating portion is cooled more effectively.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a blower unit of a vehicle air conditioner will be described below with reference to FIGS.
It will be described according to. 1 is a schematic sectional view taken along line AA of FIG. 2, FIG. 2 is a schematic sectional view taken along line BB of FIG. 1, and FIG. 3 is a schematic sectional view taken along line CC of FIG.

As shown in FIG. 1, a blower unit 10 as a motor device includes a base 11, a motor unit 12 as a motor body, a blower case 13, a blower fan 14 as a centrifugal fan, and the like. In the present embodiment, the base 1
1 and the blower case 13 constitute a housing.

The base 11 is integrally formed of a synthetic resin and has a substantially cylindrical motor case 15 serving as a case of the motor 12.
And a flange-shaped case supporting portion 16 formed on the outer peripheral side of the motor case portion 15. Motor case 15
Has a closed part 15a on one side in the axial direction and an opening 15b on the other side. Case support 16
Is provided substantially at the center of the motor case 15 in the direction of the central axis.

The motor section 12 includes a motor case section 15, a cylindrical yoke 17, a pair of field magnets 18, and an end member 1.
9, an output shaft 20, an armature 21, and the like. Yoke 17
Are fixed to the inner peripheral surface of the motor case 15. The pair of field magnets 18 are fixed to the inner peripheral surface of the yoke 17. The end member 19 is connected to the opening 1 of the motor case 15.
5b, and a brush device 22 is provided inside thereof. The output shaft 20 has a base end 20 as the other end.
a is supported by the bearing 23 held by the closing portion 15 a of the motor case portion 15, and the end portion 20 b as one end thereof is supported by the bearing 24 held by the end member 19. The output shaft 20 has an end member 20b at the tip end 20b.
9 to the outside. The armature 21 provided on the output shaft 20 has a commutator 25 on the end member 19 side.

As shown in FIG. 1 and FIG.
Holds the bearing 24, and the opening 1 of the motor case 15
The base 26 is fixed to the base 5b. The brush device 22 arranged on the outer peripheral side of the commutator 25 is provided inside the base 26.

The brush device 22 is provided as a pair on both sides of the output shaft 20. Each brush device 22
The brush holder 27 includes a brush holder 27 provided integrally with the base 26 and a brush 28 held by the brush holder 27. The brush device 22 is provided so that most of the brush device 22 is located outside the opening 15b in the axial direction of the output shaft 20. In the present embodiment, the commutator 25 and the brush 28 are heat generating parts.

As shown in FIG. 1, the case support 16
, The blower case 13 is fixed to the opening 15 b side of the motor case 15. A blower fan 14 fixed to the tip of the output shaft 20 is housed in the blower case 13. The blower fan 14 is, for example, a sirocco fan, and has an output shaft 2 such that the brush 28 and the commutator 25 are arranged in a concave portion 14a at the center thereof.
0 is fixed to the front end portion 20b.

Hereinafter, a configuration characteristic of the present embodiment will be described. As shown in FIGS. 1, 2, and 3, an air flow path 29 that guides cooling air introduced from the base end 20 a side of the output shaft 20 to each brush 28 is provided inside the motor unit 12. Is formed.

Each of the air passages 29 has an inner peripheral surface 17a of the cylindrical yoke 17, an end surface 18a of the two field magnets 18 which are adjacent in the circumferential direction, and an outer peripheral surface 21a of the armature 21.
, So as to extend in the axial direction of the output shaft 20. In the present embodiment, the yoke 17 and the field magnet 18
The armature 21 is a component of the motor unit 12.

On the side of the closed portion 15 a of the motor case 15, an air intake 30 is provided for each air flow passage 29 to take in cooling air from outside the motor 12. As shown in FIG. 2, each of the air flow paths 29 extends downward from both sides of the base end portion 20 a of the output shaft 20 and joins the air intake paths 3.
1 and communicates with the air intake 30.

The air intake port 30 is provided when the blower unit 10 is correctly installed in a predetermined posture, that is, as shown in FIG.
As shown in FIG. 3, both brushes 28 are arranged on the output shaft 20 on a horizontal plane.
When the blower unit 10 is installed so as to be located on both sides of the blower, the blower unit 10 is provided so as to open downward. That is, the air inlet 30 is provided so that water droplets do not enter the air flow path 29 from the outside through the air inlet 30 when the blower unit 10 is correctly installed in the determined posture. .

On the other hand, the brush holding unit 27
It is formed in a substantially quadrangular cylindrical shape extending so as to face each other with 0 interposed therebetween. Further, the brush holding portion 27 is disposed in a posture that is inclined such that the inner side of the brush holding portion 27 is closer to the distal end portion 20 b of the output shaft 20.

Each of the air passages 29 faces the outer periphery of the brush holder 27 so as to face each other.
The output shaft 20 is provided so as to overlap with the outer peripheral portion of the brush holding portion 27 when viewed in the axial direction. On the other hand, each brush holder 2
7 guides the cooling air discharged from the air passage 29 to the output shaft 20 side of the brush holding unit 27 and further to the commutator 25 side due to the inclination.

The end member 19 is fitted and fixed to the opening 15b of the motor case 15, as shown in FIG. Further, between the end member 19 and the opening 15b, a plurality of air discharge holes 32 for discharging the air in the motor unit 12 to the outside are formed by the end member 19.

Next, the operation of the cooling structure of the blower unit configured as described above will be described. Motor unit 12
Is operated to drive the blower fan 14, air is discharged from the inside of the blower case 13, and the space around the end member 19 becomes negative pressure. For this reason, the air in the motor unit 12 is discharged into the blower case 13 from each air discharge hole 32.

Then, a negative pressure is generated in the motor section 12, so that air outside the blower unit 10 is supplied to the air intake port 30 and the air intake path 3 as shown by arrows L and M in FIGS.
The cooling air is taken into the air flow path 29 through the air passage 1. Then, the taken-in cooling air is guided to the air flow path 29 and moves in the axial direction of the output shaft 20 toward the distal end portion 20b, and as shown by the arrow N in FIG. To the outer peripheral portion of the brush 28. At this time, the cooling air reaches the outer periphery of each brush 28 straight as indicated by a broken line P in FIG.

The cooling air that has reached the outer periphery of the brush 28 is
The brush 28 is further guided to the inner circumferential side and further to the commutator 25 side along the outer surface of the brush holding portion 27 inclined toward the distal end portion 20b, and cools the brush 28 and the commutator 25.
The air that has cooled each brush 28 and commutator 25 is discharged into the blower case 13 from each air discharge hole 32.

As a result, the brush 28 and the commutator 25 provided on the distal end portion 20 b of the output shaft 20 and disposed in the blower case 13 are connected to the outside of the motor portion 12 on the proximal end portion 20 a side of the output shaft 20. Cooled by air taken in from

According to the embodiment described in detail above, the following effects can be obtained. (1) The output shaft 2 is installed inside the motor unit 12 in which the brush 28 and the commutator 25 are located on the end portion 20 b side of the output shaft 20.
Cooling air introduced from the base end 20a side of the brush 28
The air flow path 29 leading to the inner peripheral surface 17 of the yoke 17
a, the outer peripheral surface 21a of the armature 21 and the end surface 18a of the two-field magnet 18 which are opposed in the circumferential direction. Therefore, even in the blower unit 10 in which the cooling air cannot be directly introduced into the motor section 12 from the distal end portion 20b side of the output shaft 20, the brush 28 and the commutator 25 on the distal end portion 20b side are directly cooled by the cooling air. As a result, the brush 28 and the commutator 25 are cooled more effectively, so that the abrasion of the brush 28 due to a rise in temperature can be suppressed, and the life can be prolonged. Further, an increase in contact resistance can be suppressed, and a decrease in output can be suppressed.

(2) The air flow path 29 is provided so as to overlap with each brush 28 when viewed in the axial direction of the output shaft 20. For this reason, the cooling air introduced from the base end 20a side of the output shaft 20 is guided in the axial direction by the air flow path 29, and reaches the brush 28 without changing its direction. Therefore, the flow rate of the cooling air when hitting the brush 28 is unlikely to decrease and the temperature is unlikely to rise, so that the brush 28 is cooled more effectively.

(3) Via the air inlet 30 provided in the motor section 12 so that the air passage 29 opens downward when the blower unit 10 is installed in a predetermined posture. Cooling air is introduced from outside the motor unit 12. For this reason, it is difficult for water to enter the motor section 12 from the air intake port 30 in a state where the blower unit 10 is installed. Therefore, trouble caused by water that has entered the motor unit 12 from the outside hardly occurs.

(4) One air intake 30 was communicated with an air flow path 29 provided for each brush 28. Therefore, the volume of the motor unit 12 including the air intake port 30 can be smaller than when an air intake port is provided for each air flow path 29. Further, since water hardly infiltrates into the motor section 12, troubles caused by the infiltrated water hardly occur.

(5) Each of the brushes 28
An air discharge hole 32 for discharging the air in the motor section 12 to the outside is provided on the outer peripheral side of the motor. As a result, the air that has cooled the brushes 28 and the commutator 25 is discharged to the outside of the motor unit 12 from the air discharge holes 32, so that a larger amount of new cooling air is supplied to the brushes 28 and the commutator 25. Therefore, the brush 28 and the commutator 25 can be cooled more effectively.

(6) The brush holding portion 27 is inclined such that it approaches the tip portion 20b toward the inner peripheral side, and the cooling air is applied from the air flow passage 29 to the outer peripheral portion. For this reason,
Since the cooling air is guided by the brush holding portion 27 and hits the sliding contact portion between the brush 28 and the commutator 25, the heat generating portion can be cooled effectively.

Hereinafter, embodiments other than the above embodiment will be listed. In the above-described embodiment, a flow path that forms an air introduction path between the blower case 13 and the air intake port 30 for introducing the positive pressure air in the blower case 13 into the air flow path 29 as cooling air. A forming member may be provided. In this configuration, since the positive pressure cooling air is guided to the brush 28 and the commutator 25 by the air flow path 29, the brush 28 and the commutator 25 can be cooled more effectively.

In the above embodiment, the motor unit 12
The motor case is not an integrated motor section 12 consisting of a motor case section 15 provided on the base section 11, but a base section 11.
May be a single motor housed and fixed in the motor housing part provided in the above. In this case, the air flow path 29 is formed inside the single motor, and the air flow path 29 is communicated with the end face of the motor case (the end face on the base end portion 20a side of the output shaft 20) inside the motor housing. Air holes are provided. Then, the air intake port 30 provided in the motor accommodating portion is configured to communicate with the air flow path 29 through the air hole. Even with such a configuration, the brush 28 and the commutator 25
The output shaft 20 can be cooled by cooling air introduced from the base end 20a side.

In the above embodiment, the air inlet 30
From the distal end 20 b to the proximal end 2 in the axial direction of the output shaft 20.
It may be provided so as to open in the direction toward 0a. In the above embodiment, the DC motor is not limited to the magnet type motor whose field is a magnet, but may be a series-wound, split-wound, or compound-wound motor having a field pole and a field winding. In this case, the air flow path 29 is formed by the inner peripheral surface of the yoke, the outer peripheral surface of the armature, and the end faces of the magnetic fields adjacent to each other in the circumferential direction in the circumferential direction.

In the above embodiment, the motor may be a brushless motor, and the heat generating portion may be a semiconductor switch. In the above embodiment, the blower unit 10 may be a blower unit other than the vehicle air conditioner, such as a ship air conditioner, a construction equipment air conditioner, and an aircraft air conditioner.

In the above embodiment, the blower unit may be a blower unit other than the one for the air conditioner, for example, for cooling electronic equipment and for cooling machine tools. In the above embodiment, the motor device may be a motor device for various processing other than the blower unit, for example, for driving a work jig.

Hereinafter, the technical ideas grasped from each of the above embodiments will be described together with their effects. (1) In the motor cooling structure for a motor device according to claim 6, an air introduction path between the housing and the air intake port for introducing positive-pressure air into the air flow path from inside the housing. The motor cooling structure of the motor device provided with the flow path forming member for forming the motor. According to such a configuration, since the cooling air of the positive pressure is supplied to the heat generating portion, the heat generating portion can be cooled more effectively.

(2) A motor device comprising the motor cooling structure of the motor device according to any one of claims 1 to 7. (3) A blower unit comprising the motor cooling structure of the motor device according to any one of claims 1 to 7.

[0052]

According to the present invention, the heat generating portion at one end of the output shaft in the motor body is made to take air from the other end of the output shaft into the motor body. It can be cooled effectively.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a blower unit of a vehicle air conditioner.

FIG. 2 is a schematic cross-sectional view taken along line BB in FIG.

FIG. 3 is a schematic cross-sectional view taken along line CC in FIG.

FIG. 4 is a schematic front view showing an end member.

FIG. 5 is a schematic sectional view showing a conventional blower unit.

[Explanation of symbols]

Reference numeral 10 denotes a blower unit as a motor device, 11 ... a base part constituting a housing, 12 ... a motor part as a motor body, 13 ... a blower case constituting a housing, 14
... Blower fan as a centrifugal fan, 17 ... Yoke as a component, 17a ... Inner peripheral surface, 18 ... Same field magnet, 18a ... End surface, 20 ... Output shaft, 20a ... Basic end portion as the other end, 20b ... End portion as one end, 21 ... armature as a constituent member, 21a ... outer peripheral surface, 25 ... commutator as a heat generating portion, 28 ... brush as well, 29 ... air flow path, 3
0: air inlet, 32: air outlet.

Claims (7)

[Claims] A motor body (12) has an output shaft (2).
0), the motor cooling structure of the motor device having a heat generating portion (25, 28) on one end side, wherein the output shaft (2) is provided inside the motor body (12).
The air flow path (29) for guiding the cooling air introduced from the other end (20a) side of 5) to the heating section (25, 28) is
Components (17, 18, 21) of the motor body (12)
A motor cooling structure for a motor device characterized by being formed by: 2. The motor cooling structure for a motor device according to claim 1, wherein the motor body (12) is a brush type DC motor, and the heating unit is a brush (28) and a commutator (25). The air flow path (29) includes an inner peripheral surface (17a) of a cylindrical yoke (17) and a pair of two-field magnets (18) that are fixed to the inner peripheral surface (17a) and circumferentially adjacent to each other. ) And the outer peripheral surface (21) of the armature (21).
a) the motor cooling structure of the motor device, wherein the motor cooling structure is formed so as to extend in the axial direction of the output shaft (20). 3. The cooling structure for a motor device according to claim 2, wherein the air flow path (29) is provided at a position overlapping the brush (28) when viewed in the axial direction of the output shaft (20). A motor cooling structure for a motor device. 4. The motor cooling structure for a motor device according to claim 3, wherein the air flow path (29) opens downward when the motor device (10) is installed in a predetermined posture. A motor cooling structure for a motor device, wherein air is introduced from outside the motor main body (12) through an air intake port (30) provided in the motor main body (12). 5. The motor cooling structure for a motor device according to claim 4, wherein the air intake (30) is one, and the air intake (30) is provided with a plurality of the brushes (28). The motor cooling structure of the motor device, wherein the motor cooling structure is communicated with the air flow path (29) provided for each of the above. 6. The motor cooling structure for a motor device according to claim 2, wherein a centrifugal fan (14) is fixed to one end of the output shaft (20). The motor main body (1) is placed in a housing (11, 13) accommodating the centrifugal fan (14).
2) A fixed blower unit (10), wherein the brush (28) and the commutator (25) are arranged in the housing (11, 13). Cooling structure. 7. The motor cooling structure for a motor device according to claim 1, wherein the motor body (12) is provided at one end of the output shaft (20). A motor cooling structure for a motor device, comprising an air discharge hole (32) for communicating the inside and the outside of the motor body (12) so that air inside the body (12) can be discharged to the outside.