JP7620531B2 - Rotating Electric Machine - Google Patents

Description

The present invention relates to a rotating electric machine.

Conventionally, a rotating electric machine is known that includes a housing, a rotor partly housed in the housing, a stator housed in the housing, and a fan fixed to the rotor, with an air intake and an exhaust port provided in the housing. In a rotating electric machine with such a configuration, the fan rotates together with the rotor, generating an air flow that flows from the air intake through the rotor core and stator of the rotor to the exhaust port, thereby cooling the stator, etc.

JP 2000-299957 A

In this type of rotating electric machine, for example, noise is generated inside the housing as the rotor rotates.

Therefore, one of the objectives of the present invention is to provide a rotating electric machine with a new configuration that can reduce noise leaking outside the housing.

A rotating electric machine according to an embodiment of the present invention has a housing provided with an intake port and an exhaust port, a rotor core housed in the housing, and a shaft to which the rotor core is fixed, the rotor being rotatable relative to the housing and positioned below the intake port and the exhaust port, a stator housed in the housing, surrounding the rotor core and positioned below the intake port and the exhaust port, and a stator housed in the housing, fixed to the shaft alongside the rotor core in the axial direction of the shaft, positioned below the intake port and the exhaust port, and rotating integrally with the shaft, axial air flows from the intake port through the rotor core and the stator to the exhaust port. the first lower wall, the first upper wall, and the pair of first side walls, a first opening is provided in a portion of the first lower wall, the first upper wall, and the pair of first side walls excluding the first lower wall, and an exhaust duct that guides the air that has flowed in from the first opening to the exhaust port, wherein the first opening is connected to a space inside the exhaust duct that is surrounded by the first lower wall, the first upper wall, and the pair of first side walls.

The rotating electric machine of the present invention provides a rotating electric machine with a new configuration that can reduce noise leaking outside the housing.

FIG. 1 is an exemplary perspective view of a rotating electric machine according to an embodiment. FIG. 2 is an exemplary cross-sectional view of a rotating electric machine body in the rotating electric machine according to the embodiment. FIG. 3 is an exemplary cross-sectional view of an air duct in the rotating electric machine according to the embodiment. FIG. 4 is an exemplary cross-sectional view of an air duct in the rotating electric machine according to the embodiment. FIG. 5 is an exemplary cross-sectional view of an air duct in the rotating electric machine according to the embodiment.

The following describes exemplary embodiments of the present invention. The configurations (technical features) of the embodiments described below, as well as the actions and results (effects) brought about by the configurations, are merely examples.

The drawings are schematic, and the dimensional relationships and ratios of each element may differ from reality. The drawings may also contain parts with different dimensional relationships and ratios. In this specification, ordinal numbers are used only to distinguish between parts, members, locations, positions, directions, etc., and do not indicate order or priority.

Figure 1 is an exemplary perspective view of a rotating electric machine 1 according to an embodiment. Figure 2 is an exemplary cross-sectional view of a rotating electric machine body 23 in the rotating electric machine 1 according to an embodiment.

As shown in Fig. 1 and Fig. 2, the rotating electric machine 1 includes a housing 11, a rotor 12, a stator 13, a fan 18, intake ducts 31A and 31B, and an exhaust duct 32. Hereinafter, the intake ducts 31A and 31B will be collectively referred to as intake duct 31. Note that the stator 13 and the fan 18 are not shown in Fig. 1.

In the following description, for convenience, three mutually orthogonal directions are defined. The X direction is along the longitudinal direction of the housing 11 and the axial direction of the rotational center axis Ax of the rotor 12. The Y direction is along the direction perpendicular to the short side direction of the housing 11 and the axial direction of the rotational center axis Ax. The Z direction is along the vertical direction of the housing 11. The X direction, Y direction, and Z direction are mutually orthogonal. Here, the rotational center axis Ax is the central axis (center line) of the shaft 14 of the rotor 12. In other words, the axial direction, radial direction, and circumferential direction of the rotational center axis Ax are the same as the axial direction, radial direction, and circumferential direction of the shaft 14. In the following description, unless otherwise specified, the axial direction, radial direction, and circumferential direction are the axial direction, radial direction, and circumferential direction of the rotational center axis Ax, that is, the axial direction, radial direction, and circumferential direction of the shaft 14.

The housing 11 is formed in a box shape. The housing 11 houses a part of the rotor 12, the stator 13, the fan 18, the intake duct 31, and the exhaust duct 32.

The housing 11 has multiple walls, including a bottom wall 11a, a top wall 11b, two end walls 11c and 11d, and two side walls 11e and 11f.

The lower wall 11a and the upper wall 11b both extend in a direction perpendicular to the Z direction (X-Y plane) and are arranged parallel to each other with a gap in the Z direction. The lower wall 11a forms the lower end of the housing 11, and the upper wall 11b forms the upper end of the housing 11.

End wall 11c and end wall 11d both extend along the axial direction, i.e., along a direction perpendicular to the X direction (Y-Z plane), and are provided parallel to each other with a gap in the X direction. End wall 11c spans between the ends of lower wall 11a and upper wall 11b that are opposite in the X direction, and end wall 11d spans between the ends of lower wall 11a and upper wall 11b in the X direction.

Sidewall 11e and sidewall 11f both extend in a direction perpendicular to the axial direction, i.e., perpendicular to the Y direction (X-Z plane), and are provided parallel to each other with a gap in the Y direction. Sidewall 11e spans between the ends of lower wall 11a and upper wall 11b in the Y direction, and sidewall 11f spans between the ends of lower wall 11a and upper wall 11b in the opposite direction in the Y direction.

The housing 11 is provided with a plurality of (four, for example) intake ports 11g and a plurality of (two, for example) exhaust ports 11h. Two intake ports 11g are provided on each of the side walls 11e and 11f. One exhaust port 11h is provided on each of the end walls 11c and 11d. The exhaust port 11h is provided above the intake ports 11g. Note that the positions and numbers of the intake ports 11g and exhaust ports 11h are not limited to those described above.

The housing 11 is composed of a combination of multiple members. For example, the housing 11 has a main body 21 and an air duct cover 22 that is disposed above the main body 21 and fixed to the main body 21. The main body 21 and the air duct cover 22 have internal spaces that communicate with each other.

The rotor 12 has a shaft 14 and a rotor core 15. The rotor core 15 is fixed to the shaft 14 between both axial ends. The rotor 12 is located below the intake port 11g and the exhaust port 11h.

The shaft 14 is supported by the housing 11 via two bearings 16 so as to be rotatable around the central axis of rotation Ax. In other words, the two bearings 16 support the shaft 14 so as to be rotatable relative to the housing 11. The two bearings 16 are located on both sides of the rotor core 15 in the axial direction. In other words, the rotor core 15 is located between the two bearings 16 in the axial direction.

Both axial ends of the shaft 14 protrude from the housing 11 to the outside of the housing 11. One end 14a is connected to a connection target (not shown).

A fan 18 is fixed between each of the two bearings 16 and the rotor core 15 on the shaft 14. That is, the fan 18 is housed in the housing 11 and is fixed to the shaft 14 in line with the rotor core 15 in the axial direction of the shaft 14. The fan 18 is located below the intake port 11g and the exhaust port 11h. The fan 18 rotates together with the shaft 14. The fan 18 rotates together with the shaft 14 to send air in the axial direction toward the rotor core 15, thereby generating an air flow within the housing 11. Specifically, the fan 18 rotates together with the shaft 14 to generate an air flow from the intake port 11g to the exhaust port 11h via the rotor core 15 and the stator 13. At this time, the air passes through passages (not shown) provided in each of the rotor core 15 and the stator core 19. This allows heat exchange between the rotor core 15 of the rotor 12 and the stator core 19 of the stator 13 and the air, cooling the rotor core 15 and the stator core 19. The fan 18 is also called an internal fan.

Two bearings 16 are provided on the two end walls 11c and 11d. The bearings 16 are, for example, sliding bearings or rolling bearings.

The stator 13 has a stator core 19 and a stator winding 20, and is located below the intake port 11g and the exhaust port 11h. The stator core 19 is fixed to the housing 11. That is, the stator 13 is fixed to the housing 11. The stator core 19 is located radially outside the rotor core 15 and is formed in a cylindrical shape surrounding the rotor core 15. The stator winding 20 is fixed to the stator core 19 by passing through multiple slots (not shown) formed in the inner periphery 19a of the stator core 19 so as to extend in the axial direction.

The main body 21 of the housing 11, the rotor 12, the stator 13, the bearings 16, the fan 18, etc., constitute the rotating electric machine main body 23. On the other hand, the air passage cover 22 of the housing 11, the intake duct 31, and the exhaust duct 32 constitute the air passage section 24. The intake duct 31 and the exhaust duct 32 are housed in the housing 11 and are located above the rotor 12, the stator 13, and the fan 18.

Figure 3 is an exemplary cross-sectional view of the air passage section 24 in the rotating electric machine 1 according to the embodiment. Figure 4 is an exemplary cross-sectional view of the air passage section 24 in the rotating electric machine 1 according to the embodiment. Figure 5 is an exemplary cross-sectional view of the air passage section 24 in the rotating electric machine 1 according to the embodiment.

As shown in Figures 3 to 5, the exhaust duct 32 extends in the axial direction (X direction) and spans a pair of end walls 11c, 11d of the air passage cover 22 in the housing 11. The exhaust duct 32 is located above the shaft 14. The openings at both ends of the exhaust duct 32 communicate with exhaust ports 11h provided in the end walls 11c, 11d. The exhaust duct 32 has a lower wall 32a, an upper wall 32b located above the lower wall 32a, and side walls 32c, 32d that span the lower wall 32a and the upper wall 32b. An opening 32e is provided in the lower wall 32a, the upper wall 32b, and the side walls 32c, 32d except for the lower wall 32a. Specifically, the opening 32e is provided only in the upper wall 32b. The exhaust duct 32 guides the air that flows in from the opening 32e to the exhaust port 11h. A partition member 33 is provided on the lower surface of the lower wall 32a of the exhaust duct 32. The lower wall 32a is an example of a first lower wall, the upper wall 32b is an example of a first upper wall, the side walls 32c and 32d are an example of a first side wall, and the opening 32e is an example of a first opening.

The intake duct 31 is disposed below the exhaust duct 32. As an example, two intake ducts 31 are provided. The two intake ducts 31 are arranged at an interval in the axial direction, extend in the Y direction perpendicular to the axial direction, and span a pair of side walls 11e, 11f of the air duct cover 22 in the housing 11. The two intake ducts 31 are located above the two fans 18. The openings at both ends of the intake duct 31 communicate with the intake ports 11g provided in the side walls 11e, 11f. The intake duct 31 has a lower wall 31a, an upper wall 31b located above the lower wall 31a, and side walls 31c, 31d that span the lower wall 31a and the upper wall 31b. The lower wall 31a has a horizontal portion 31aa and an inclined portion 31ab inclined with respect to the horizontal portion 31aa. An opening 31e is provided in the lower wall 31a, the upper wall 31b, and the side walls 31c and 31d, except for the lower wall 31a. Specifically, the opening 31e is provided only in the side wall 31d. The opening 31e is formed over substantially the entire area in the extension direction (Y direction) of the intake duct 31. The intake duct 31 guides the air flowing in from the intake port 11g to the opening 31e. The lower wall 31a is an example of a second lower wall, the upper wall 31b is an example of a second upper wall, the side walls 31c and 31d are examples of second side walls, and the opening 31e is an example of a second opening.

In the above configuration, the fan 18 rotates integrally with the shaft 14, generating an air flow (air current) from the intake port 11g through the rotor core 15 and the stator 13 toward the exhaust port 11h. In detail, the air flows into the intake duct 31 from the intake port 11g and flows toward the fan 18 from the opening 31e. At this time, in each intake duct 31, the air flowing in from both ends of the intake duct 31 advances in the extension direction of the intake duct 31, collides, advances upward along the side wall 31d, and then flows out from the opening 31e. That is, the air changes direction three times in the intake duct 31 and advances. This prevents dust and the like contained in the air from reaching the opening 31e. Then, the air advances in the axial direction from the fan 18 toward the rotor core 15, passes through the rotor core 15 and the stator core 19, and advances upward inside the housing 11. At this time, the rotor core 15 and the stator core 19 are cooled by the air. The air then flows into the exhaust duct 32 from the opening 32e of the exhaust duct 32, passes through the exhaust duct 32, and is exhausted from the exhaust port 11h. At this time, the partition member 33 guides the air flowing from the lower side of the exhaust duct 32 to the upper side, so that it is diverted toward the two side walls 32c and 32d of the exhaust duct 32.

As described above, in this embodiment, the rotating electric machine 1 includes the housing 11, the rotor 12, the stator 13, the fan 18, and the exhaust duct 32. The housing 11 is provided with the intake port 11g and the exhaust port 11h. The rotor 12 has a rotor core 15 housed in the housing 11 and a shaft 14 to which the rotor core 15 is fixed, and is rotatable relative to the housing 11 and is located below the intake port 11g and the exhaust port 11h. The stator 13 is housed in the housing 11, surrounds the rotor core 15, and is located below the intake port 11g and the exhaust port 11h. The fan 18 is housed in the housing 11, is fixed to the shaft 14 alongside the rotor core 15 in the axial direction of the shaft 14, and is located below the intake port 11g and the exhaust port 11h. The fan 18 rotates together with the shaft 14 to generate an air flow from the intake port 11g through the rotor core 15 and the stator 13 toward the exhaust port 11h. The exhaust duct 32 is housed in the housing 11 and is located above the rotor 12, the stator 13, and the fan 18. The exhaust duct 32 has a lower wall 32a (first lower wall), an upper wall 32b (first upper wall) located above the lower wall 32a, and side walls 32c and 32d (first side walls) that span the lower wall 32a and the upper wall 32b. An opening 32e (first opening) is provided in the lower wall 32a, the upper wall 32b, and the side walls 32c and 32d except for the lower wall 32a. The exhaust duct 32 guides the air that flows in from the opening 32e to the exhaust port 11h.

According to this configuration, the opening 32e of the exhaust duct 32 is provided in the lower wall 32a, the upper wall 32b, and the side walls 32c and 32d, excluding the lower wall 32a, so that noise generated by the rotating rotor 12 is transmitted into the exhaust duct 32 through the opening 32e and emitted from the exhaust port 11h, and reaches the opening 32e by bypassing the lower wall 32a. Therefore, according to the above configuration, the noise transmission path to the exhaust port 11h is longer than in a configuration in which the opening 32e is provided in the lower wall 32a, and the noise is attenuated accordingly, so that the noise leaking from the exhaust port 11h to the outside of the housing 11 can be reduced.

In addition, the exhaust port 11h is located above the intake port 11g.

With this configuration, the exhaust port 11h is located farther from the rotor 12 than in a configuration in which the exhaust port 11h is located lower than the intake port 11g, so noise leaking from the exhaust port 11h to the outside of the housing 11 can be reduced.

In addition, the opening 32e is provided only in the upper wall 32b.

With this configuration, the noise transmission path to the exhaust port 11h is longer than in a configuration in which the opening 32e is provided in the side walls 32c and 32d, and the noise is attenuated accordingly, so that the noise leaking from the exhaust port 11h to the outside of the housing 11 can be further reduced.

The rotating electric machine 1 also includes an intake duct 31. The intake duct 31 is housed in the housing 11 and is located above the rotor 12, the stator 13, and the fan 18. The intake duct 31 has a bottom wall 31a (second bottom wall), a top wall 31b (second top wall) located above the bottom wall 31a, and side walls 31c, 31d (second side walls) that span the bottom wall 31a and the top wall 31b. An opening 31e (second opening) is provided in the bottom wall 31a, the top wall 31b, and the side walls 31c, 31d except for the bottom wall 31a. The intake duct 31 guides the air flowing in from the intake port 11g to the opening 31e.

According to this configuration, the opening 31e of the intake duct 31 is provided in the lower wall 31a, the upper wall 31b, and the side walls 31c and 31d, excluding the lower wall 31a, so that noise generated by the rotating rotor 12 is transmitted into the intake duct 31 through the opening 31e and emitted from the intake port 11g, and reaches the opening 31e by bypassing the lower wall 31a. Therefore, according to the above configuration, the noise transmission path to the intake port 11g is longer than in a configuration in which the opening 31e is provided in the lower wall 31a, and the noise is attenuated accordingly, so that the noise leaking from the intake port 11g to the outside of the housing 11 can be reduced.

In addition, the opening 31e is provided only in the side wall 31d.

This configuration can prevent dust from inside the housing 11 from falling into the intake duct 31, compared to a configuration in which an opening 31e is provided in the upper wall 31b.

The opening 31e may be provided in the upper wall 31b. The opening 32e may be provided in the side wall 32c.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

1... rotating machine, 11... housing, 11g... intake port, 11h... exhaust port, 12... rotor, 13... stator, 14... shaft, 15... rotor core, 18... fan, 31, 31A, 31B... intake duct, 31a... bottom wall (second bottom wall), 31b... top wall (second top wall), 31c, 31d... side wall (second side wall), 31e... opening (second opening), 32... exhaust duct, 32a... bottom wall (first bottom wall), 32b... top wall (first top wall), 32c, 32d... side wall (first side wall), 32e... opening (first opening).

Claims (5)

a housing provided with an intake port and an exhaust port;
a rotor having a rotor core accommodated in the housing and a shaft to which the rotor core is fixed, the rotor being rotatable relative to the housing and positioned below the intake port and the exhaust port;
a stator housed in the housing, surrounding the rotor core, and positioned below the intake port and the exhaust port;
a fan that is housed in the housing, is fixed to the shaft alongside the rotor core in the axial direction of the shaft, is positioned below the air intake and the air exhaust, and rotates integrally with the shaft to generate an air flow that flows from the air intake through the rotor core and the stator toward the air exhaust;
an exhaust duct that is housed in the housing and is located above the rotor, the stator, and the fan, the exhaust duct having a first bottom wall, a first upper wall that is located above the first bottom wall and faces the first bottom wall , and a pair of first side walls that span the first bottom wall and the first upper wall, the first opening being provided in a portion of the first bottom wall, the first upper wall, and the pair of first side walls excluding the first bottom wall, and the exhaust duct that guides the air that has flowed in from the first opening to the exhaust port;
Equipped with
The first opening communicates with an internal space of the exhaust duct surrounded by the first lower wall, the first upper wall, and the pair of first side walls.
Rotating electric motor. The exhaust port is provided above the intake port.
The rotating electric machine according to claim 1 . The first opening is provided only in the first upper wall.
3. A rotating electric machine according to claim 1 or 2. the air conditioner is housed in the housing and is located above the rotor, the stator, and the fan; the air conditioner has a second bottom wall, a second top wall located above the second bottom wall, and a second side wall extending between the second bottom wall and the second top wall; a second opening is provided in a portion of the second bottom wall, the second top wall, and the second side wall excluding the second bottom wall; and an air intake duct is provided to guide the air flowing in from the air intake port to the second opening.
A rotating electric machine according to any one of claims 1 to 3. The second opening is provided only in the second side wall.
The rotating electric machine according to claim 4.

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