JP3184764B2 - Rotating electric machine stator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotating electric machine suitable for a large-sized rotating electric machine of a class of several hundred kW to several thousand kW used for a pump, a refrigerator, a blower and the like.

[0002]

2. Description of the Related Art An example of a stator for a rotary electric machine of this kind is shown in FIG.
5 to 37. 35 to 37, the main body 2 of the stator frame 1 includes a bottom wall 3, side walls 4 and 5 erected on both ends in the radial direction of the bottom wall 3, and an axial direction of the bottom wall 3. Connecting walls 6 and 7 erected at both ends of the bottom wall 3 and connecting the respective ends of the side walls 4 and 5, and a center of the both side walls 4 and 5 erected at an axial center of the bottom wall 3. And a reinforcing wall 8 connecting the parts. Here, the connecting walls 6, 7
Are composed of outer walls 6a, 7a and inner walls 6b, 7b, respectively. The outer surfaces of the outer walls 6a and 7a serve as mounting surfaces for mounting a bearing bracket. The connecting walls 6, 7 and the reinforcing wall 8 are formed with through holes 8a having substantially the same diameter as the outer diameter of the stator core 9 and having a substantially circular shape so that the stator core 9 can be taken in and out. (Only the reinforcing wall 8 is shown in FIG. 37).

A plurality of, for example, ten axial ribs 10a to 10j extending in the axial direction are provided inside the stator frame body 2.
Are arranged in a cylindrical shape. In this case, the axial rib 10
a to 10j, both ends of the inner walls 6b, 7b of the connecting walls 6, 7
And a central portion thereof is integrally connected to the reinforcing wall 8. The stator core 9 is press-fitted inside the axial ribs 10a to 10j arranged in a cylindrical shape and is fitted and supported.

[0004]

However, in the above-described conventional configuration, the deformation (vibration) of the stator core 9 in the elliptic mode caused by the magnetomotive force distribution of the stator core 9 is caused to pass through the reinforcing wall 8 to the side wall of the stator frame main body 2. The side walls 4 and 5 are vibrated by being transmitted to the side walls 4 and 5. For this reason, when the output of the rotating electric machine is large, the vibration of the side walls 4 and 5 becomes considerably large, the operation noise increases, and the structural members of the rotating electric machine may be damaged. In particular, in a two-pole rotating electric machine, the elliptical mode vibration of the stator core 9 often occurs remarkably.

As a configuration for solving such a disadvantage, a stator as shown in FIG. 38 has been considered. In this configuration, the axial ribs 11 are provided on both sides of the outer peripheral portion of the stator core 9.
a and 11b are welded, and the axial ribs 11a and 11b are placed and supported on support bases 14a and 14b projecting upward on the bottom wall 13 of the stator frame main body 12. According to the above configuration, the axial ribs 11a,
11b does not come into contact with the side walls 15, 16 of the stator frame main body 12, so that the vibration of the side walls 15, 16 can be reduced. Therefore, even when the output of the rotating electric machine is large, the vibration of the side walls 15 and 16 can be reduced, and the operating noise can be reduced.

However, in the case of the above configuration, when the operation of aligning the axis of the stator core 9 and the axis of the bearing bracket attached to the stator frame main body 12 concentrically, a very troublesome operation must be performed. However, there is a problem that the productivity is considerably deteriorated.

Accordingly, an object of the present invention is to provide a stator for a rotating electric machine which can reduce the vibration of the side wall of the stator frame main body, reduce the operation noise, and improve the manufacturability. To offer.

[0008]

According to the present invention, there is provided a stator for a rotating electric machine, comprising: a stator frame having a plurality of axial ribs extending in the axial direction arranged in a cylindrical shape inside a stator frame main body; And a stator core fitted and supported inside the plurality of axial ribs, wherein the stator frame body includes a bottom wall, and both end portions in the radial direction of the bottom wall. And a connecting wall that stands on both axial side edges of the bottom wall and connects each end of the both side walls, and the connecting wall includes an outer wall, An inner wall, the outer wall and the
A connecting shaft provided between the inner wall and the inner wall
And a bearing bracket on the outer wall.
Ri together give, together with the a plurality of axial ribs bridge shape between the inner walls, the plurality of intermediate portions of the axial ribs and said sidewalls are configured to be non-contact, prior to
The plurality of axial ribs and the connecting axial rib are aligned with each other.
The feature is that it is configured not to be placed on the top .

According to this configuration, a plurality of axial ribs for fitting and supporting the stator core are provided in a bridge shape between the inner walls of the connecting walls of the stator frame main body, and an intermediate portion between the plurality of axial ribs and the stator are provided. Since the configuration is such that the side wall of the frame body is in a non-contact state, the elliptical mode vibration of the stator core is not transmitted to the side wall. Therefore, the vibration of the side wall is reduced, and the operation noise is reduced. Also, the inner wall of the connecting wall is bent.
Because it becomes deformable, the electromagnetic vibration generated in the stator core
Even if it is transmitted to the inner wall through the axial rib, it is absorbed here
Become like For this reason, the above-mentioned electromagnetic vibration is applied to the outer wall of the connecting wall.
The amount transmitted is reduced, and from this point too, the operating noise
Is reduced. Furthermore, because provided the bridge-like a plurality of axial ribs between the inner wall of the connecting wall, the axis of the stator core, connected
The work of concentrically aligning the shaft center of the bearing bracket attached to the outer wall of the wall can be easily performed.

Further, in the case of the above configuration, a plurality of axial ribs are formed by rotating a horizontal axis and a vertical axis passing through the axis on a plane orthogonal to the axis of the stator core by 45 degrees. 4 axes consisting of two axes
Parameter representing the effect of shape on bending stiffness
It is preferable to arrange such that a certain second moment of area is within a range of ± 10%. With this configuration, the deviation between the axis of the stator core fitted and supported inside the plurality of axial ribs and the axis of the spigot of the bearing bracket mounting portion of the stator frame body is small, that is, , Concentricity can be increased. For this reason, the eccentricity of the air gap of the iron core portion in the rotating electric machine can be reduced, and therefore, the occurrence of electromagnetic vibration can be suppressed. Further, since the secondary machining of the spigot of the bearing bracket mounting portion in the stator frame main body is not required, the productivity is further improved.

Further, except for a pair of axial ribs vertically sandwiching the stator core among the plurality of axial ribs, other axial ribs are positioned asymmetrically with respect to the axis of the stator core. It is good also as composition to arrange in. With such a configuration, since the axial rib does not exist on the major axis of the elliptic mode deformation due to the magnetomotive force of the stator core, the tension between the axial ribs can be avoided. Thereby, since the deformation of the stator frame can be reduced, the amount of electromagnetic vibration generated in the stator core transmitted to the stator frame can be reduced.

Furthermore, it is preferable that the stator core is press-fitted into the plurality of axial ribs. In this configuration, there is no need to perform an adjustment operation for concentrically aligning the axis of the stator core with the axis of the spigot of the bearing bracket mounting portion of the stator frame main body, and the productivity is further improved.

In one of the plurality of axial ribs, an axial rib located above the stator core is located at a position which is 4/3 times a neutral axis radius of an elliptic mode deformation due to a magnetomotive force of the stator core. It is also a good configuration that a reinforcing rib is provided so as to extend in a tangential direction on an outer periphery of the stator core, and the reinforcing rib is connected to the side wall. here
The `` neutral axis of the elliptical mode deformation '' is the origin of the stator core.
When stator core deforms in elliptical mode due to magnetic force distribution
A surface that does not expand or contract so that the circumferential stress is zero, and is fixed
The line of intersection between the axis of the core and the plane perpendicular to the axis, and its radius
Is called “neutral axis radius”. In the case of the above configuration, since a component in the tangential direction of the elliptic mode deformation of the stator core does not occur at a position 4/3 times the radius of the neutral axis, the tangential direction of the elliptical mode deformation of the stator core does not occur. Components, that is, components in the horizontal direction, can be prevented from being transmitted to the side wall of the stator frame main body via the reinforcing ribs. Further, by providing the reinforcing ribs, the strength of the stator frame can be increased.

Further, it is conceivable to provide the reinforcing rib so that it can be attached to and detached from the stator frame and can be attached with its position shifted in the axial direction. According to this configuration, the natural frequency of the stator frame can be changed by changing the mounting position of the reinforcing rib.

On the other hand, one or a plurality of annular ribs may be provided so as to connect intermediate portions of the plurality of axial ribs, and the annular rib and the side wall may be in a non-contact state. preferable. In the case of this configuration, since the intermediate portions of the plurality of axial ribs are connected by the annular rib, the strength of the stator frame can be increased. Since the annular rib and the side wall of the stator frame body are configured to be in a non-contact state, the vibration of the stator core in the elliptical mode is not transmitted to the side wall.

Further, by giving flexibility to the plurality of axial ribs, the natural frequency of the stator frame is increased by a (formula (1)).
(See Reference) It is also possible to configure so as to be lower than Hz. With such a configuration, resonance is hardly caused by electromagnetic vibration generated in the rotating electric machine, and vibration isolation is improved.

Further, on the circumference passing through the plurality of axial ribs arranged in a cylindrical shape, one of the intersections between the horizontal axis passing through the axis of the stator core and the circumference is 0 degrees, and the other is 18 degrees.
When the uppermost point of the circumference is 90 degrees and the lowermost point is 270 degrees, the axial rib is set within a range of 210 to 330 degrees excluding the lowermost point of the circumference 270 degrees. It is a more preferable configuration to not arrange them. With such a configuration, it has been experimentally confirmed that the amount of electromagnetic vibration generated in the stator core transmitted to the side wall of the stator frame can be reduced, and the operating noise can be reduced.

[0018]

Further, it is conceivable to dispose the plurality of axial ribs below a horizontal plane passing through the axis of the stator core. With this configuration, the stator core can be incorporated into the plurality of axial ribs from above, so that the assemblability is improved.

Further, in the case of the above configuration, it is preferable that the outer periphery of the stator core is provided with projections which respectively come into contact with the upper surfaces of a pair of axial ribs located at the top of the plurality of axial ribs. . According to this configuration, the stator core incorporated into the plurality of axial ribs is stopped from rotating by the protrusions that come into contact with the upper surfaces of the pair of axial ribs located at the top.

Further, the protrusion provided on the outer peripheral portion of the stator core contacts the notch formed on the upper surface side of the pair of axial ribs located at the uppermost position among the plurality of axial ribs. It is also preferable to configure so as to perform the above. In this configuration, the protrusion located in the notch allows the stator core to be prevented from rotating, and also facilitates the axial positioning operation of the stator core, thereby improving productivity.

On the other hand, it is also possible to provide a connecting member on the upper part of the outer peripheral surface of the stator core, and to connect the connecting member to the upper part of the side wall by a connecting plate. In the case of this configuration, the stator core can be supported so as to be sandwiched between the connecting rib and the axial rib positioned below the horizontal plane passing through the axis, so that the stator core support strength is improved. . Moreover, the positioning of the stator core in the axial direction can be easily performed by the connecting plate. Further, by providing the connecting plate between the side walls, the strength of the stator frame can be increased.

Alternatively, a connecting member is provided on an upper portion of an outer peripheral surface of the stator core, and a pair of axial ribs for connecting the core is provided above a connecting wall of the stator frame body so as to be separated from the side wall. The connecting member and the pair of iron core connecting axial ribs may be connected by a connecting plate. In the case of this configuration, even if the electromagnetic vibration generated in the stator core is transmitted to the core connecting axial rib via the connecting plate, the electromagnetic vibration is absorbed here, so that the electromagnetic vibration is not transmitted to the side wall.

[0024] Further, the connecting plate may be formed so that the connecting member has an elliptic mode deformation caused by a magnetomotive force of the stator core.
It is preferable to configure so as to be provided at a position 4/3 times the radius of the neutral shaft . In this configuration, as described above, neutral
Since the tangential component of the elliptical mode deformation of the stator core does not occur at a position that is 4/3 times the axial radius, the tangential component of the elliptic mode deformation of the stator core passes through the stator plate via the coupling plate. Transmission to the side wall of the main body or the axial rib for iron core connection can be prevented.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, as shown in FIGS. 1 and 2, the main body 22 of the stator frame 21 has a substantially rectangular box shape as a whole. The stator frame main body 22 includes a bottom wall 23, and side walls 24 and 25 erected on both ends of the bottom wall 23 in the radial direction (vertical direction in FIG. 1).
The bottom wall 23 is provided with connecting walls 26 and 27 erected at both ends in the axial direction (the left-right direction in FIG. 1) to connect the respective ends of the side walls 24 and 25. The connection wall 2
6 and 27 are the outer walls 26a and 27a and the inner wall 2 respectively.
6b and 27b. And outer wall 2
The outer surfaces of 6a and 27a are mounting surfaces for mounting the bearing bracket. In addition, the outer walls 26a, 2
7a and the inner walls 26b, 27b, connecting axial ribs 26d, 26e, 27d,
27e is provided. Here, the connecting axial rib 2
6d, 26e, 27d, 27e are a plurality of axial ribs 2
It is configured not to be arranged in a straight line with 9a to 29h. The connecting walls 26, 27 are formed with through holes 26c, 27c slightly larger in diameter than the outer diameter of the stator core 28 and substantially circular in order to put the stator core 28 in and out.

The stator frame body 22 has a plurality of, for example, eight axial ribs 29a to 29h extending in the axial direction.
Are arranged in a cylindrical shape (see also FIG. 3). in this case,
The inner surfaces of the axial ribs 29a to 29h are formed in a curved shape so as to form an inner peripheral surface of a cylinder slightly smaller in diameter than the outer diameter of the stator core 28 in order to press-fit the stator core 28. Each of the axial ribs 29a to 29h has both ends integrally connected to the inner walls 26b and 27b of the connection walls 26 and 27, and a central portion integrally connected to the annular rib 30 (FIG. 4). See also). In this case, each axial rib 2
9a to 29h are provided like a bridge between the connecting walls 26b and 27b. As shown in FIG. 4, the annular rib 30 has only a lower portion integrally connected to the bottom wall 23 of the fixed supporting frame main body 22 and is in a non-contact state with the side walls 24 and 25. I have. Thereby, the axial ribs 29a-
29h and the side walls 24 and 25 of the stator frame body 22
Are in a non-contact state.

The stator cores 28 are provided inside the axial ribs 29a to 29h arranged in a cylindrical shape as described above.
Is fitted and fixed by being press-fitted. The stator core 28 is formed by laminating steel plates punched into a predetermined shape and welding them, for example.

Here, the eight axial ribs 29a to 29a-2
The arrangement of 9h will be specifically described with reference to FIG. As shown in FIG. 3, a horizontal axis and a vertical axis passing through the axis C are represented by straight lines X and Y on a plane orthogonal to the axis C of the stator core 28. Two axes obtained by rotating the horizontal axis X and the vertical axis Y by 45 degrees are represented by straight lines V and W. In this case, the eight axial ribs 29a to 29h correspond to the respective axes X, Y, V, W with respect to the four axes X, Y, V, W.
The cross-sectional shape and circumferential angle of each of the axial ribs 29a to 29h so that the second moments of area on both sides of W fall within the range of ± 10% (that is, are equal within the range of ± 10%). It is configured to be arranged while adjusting in consideration of the above.

Further, a pair of axial ribs 2 sandwiching the stator core 28 up and down among the eight axial ribs 29a to 29h.
Other axial ribs 29b to 29g except 9a and 29h are:
The stator core 28 is configured to be disposed at an asymmetric position with respect to the axis C of the stator core 28. The stator frame 21 having the above-described configuration is integrally formed by casting with a metal such as iron.

According to the present embodiment having such a configuration, the eight axial ribs 29a to 29a for fittingly supporting the stator core 28 are provided.
9h to the inner walls 26 of the connecting walls 26 and 27 of the stator frame body 22.
b, 27b are provided in a bridge shape, and each axial rib 29a-2
The intermediate portion of 9h and the side walls 24 and 25 of the stator frame main body 22 are configured to be in a non-contact state. As a result, the elliptic mode vibration (deformation) caused by the magnetomotive force distribution of the stator core 28, particularly the vibration that is significantly generated in the two-pole rotating electric machine, is not transmitted to the side walls 24, 25. As a result,
The vibration of the side walls 24 and 25 of the stator frame main body 22 can be reduced, and the operating noise can be reduced. In the case of the above configuration, the eight axial ribs 29a to 29h are connected to the inner walls 26b, 2b of the connecting walls 26, 27.
7b, the inner walls 26b, 27b
Thereby, the positions of the axial ribs 29a to 29h can be easily and accurately positioned. For this reason, the operation of aligning the axis C of the stator core 28 with the axis of the bearing bracket attached to the stator frame main body 22 can be easily performed.

In the above embodiment, as shown in FIG. 3, the eight axial ribs 29a to 29h are connected to the horizontal axis X passing through the axis C on a plane orthogonal to the axis C of the stator core 28. In addition, for the four axes consisting of the vertical axis Y and the two axes V and W obtained by rotating the two axes X and Y by 45 degrees, the secondary moments of area on both sides of these axes X, Y, V and W are ± 10
%. Thereby, the axis C of the stator core 28 fitted and supported inside the eight axial ribs 29a to 29h and the stator frame body 22
Of the bearing bracket mounting portion from the shaft center of the spigot can be made small (that is, the concentricity is high).
As a result, it is possible to reduce the eccentricity of the air gap of the iron core portion in the rotating electric machine, and thus it is possible to suppress the occurrence of electromagnetic vibration.

Specifically, one of the four axes X, Y, V, and W that define the second moment of area of the axial ribs 29a to 29h, for example, the second moment of area around the X axis is u. %, The amount of eccentricity ε of the shaft center C at the time of press-fitting the core is expressed by the following equation, where s is the interference of the press-fitting diameter of the core, from the difference in bending stiffness on both sides of the X-axis.

Ε = (s / 2) · (u / 100) / (u /
100 + 2) Here, taking as an example a rotating electric machine having an air gap G = 1 mm and a core press-fit diameter interference s = 0.2 mm, the difference in the second moment of area on both sides of the X-axis is at most 10%.
Eccentricity of the iron core to the air gap when
G is calculated as follows.

Ε = (0.2 / 2) · (10/100) / (10/100 + 2) = 0.00476 mm Therefore, ε / G = 0.00476 / 1 = 0.00476, and the air gap of 0. It can be seen that eccentricity of about 5% can be suppressed. This eliminates the need for secondary machining of the spigot of the bearing bracket mounting portion of the stator frame main body 22 for reducing the air gap eccentricity, so that the number of manufacturing steps can be reduced and the manufacturability is improved accordingly. be able to.

In the above embodiment, the other axial ribs 29b to 29g except the pair of axial ribs 29a and 29h vertically sandwiching the stator core 28 among the eight axial ribs 29a to 29h. Are arranged at positions that are asymmetrical with respect to the axis C of the stator core 28.
The axial rib does not exist on the major axis of the elliptic mode deformation (vibration) due to the magnetomotive force. Thereby, the tension between the axial ribs can be avoided, and the deformation of the stator frame 21 can be reduced. Therefore, the amount of electromagnetic vibration generated in the stator core 28 transmitted to the fixed support frame 21 can be reduced. it can.

In the above embodiment, the stator core 28
To eight axial ribs 29a to 29h of the stator frame body 22.
The stator core 29 is press-fitted and fixed at the time of fitting into the inside, so that the axis C of the stator core 28 and the axis of the spigot of the bearing bracket mounting portion of the stator frame body 22 are concentric. This eliminates the need for an adjustment operation to match the above, and can further improve the manufacturability.

Further, in the above embodiment, the connecting walls 26, 27
Connecting axial ribs 26d, 26e, 27 provided to connect the outer walls 26a, 27a and the inner walls 26b, 27b.
The d and 27e are arranged so as not to be aligned with the plurality of axial ribs 29a to 29h. As a result, the inner walls 26b and 27b of the connecting walls 26 and 27 can be flexibly deformed. Therefore, even if the electromagnetic vibration generated in the stator core 28 is transmitted to the inner walls 26b and 27b through the axial ribs 29a to 29h, the inner walls 26b and 27b are not changed. Become absorbed. Therefore, the amount of the electromagnetic vibration transmitted to the outer walls 26a, 27a of the connecting walls 26, 27 can be reduced, and the operating noise can be reduced accordingly.

Further, in the above-described embodiment, since one annular rib 30 connecting the intermediate portions of the plurality of axial ribs 29a to 29h is provided, the strength of the stator frame 21 can be increased. it can. In addition, in this configuration, since one annular rib 30 and the side walls 24 and 25 of the stator frame 21 are in a non-contact state, the stator core 28
Is not transmitted to the side walls 24 and 25 of the stator frame 21, so that the vibrations of the side walls 24 and 25 can be reduced and the operation noise can be reduced.

Next, FIG. 5 to FIG. 11 show a second embodiment of the present invention, and the points different from the first embodiment will be described. The same parts as those of the first embodiment are denoted by the same reference numerals. In the second embodiment, FIGS.
As shown in the figure, in the axial ribs 29a located above the stator core 28 among the eight axial ribs 29a to 29h, the neutral axis radius R of the elliptic mode deformation due to the magnetomotive force of the stator core 28 is 4 times. The reinforcing ribs 31a, 31a are extended at / 3 times in the tangential direction of the outer periphery of the stator core 28.
b, 31c and 31d are integrally provided, and these reinforcing ribs 3
1a, 31b, 31c, and 31d are connected to the side wall 24,
25 is integrally connected. It should be noted that, in the above
The vertical axis radius R is determined by the outer peripheral radius R2 of the stator core 28 and the slot bottom radius R1.

FIG. 8 is a schematic diagram of an elliptic mode vibration generated by a magnetomotive force distribution of a stator core of a two-pole rotating electric machine, for example, and the neutral axis radius R of the elliptical mode deformation will be described with reference to FIG. I do. In FIG. 8 above,
A circle 32 indicated by a two-dot chain line is the outer periphery of the stator core 28, and the radius of the circle 32 is R2. A circle 33 indicated by a two-dot chain line is the circumference of the slot bottom of the stator core 28, and this circle 33
Is R1. The dashed-dotted circle 34 is the circumference of the center axis of the elliptical mode deformation, and the radius of the circle 34 is R. The radius R of the neutral axis is represented by the following equation.

R = rt · (1 + t) where t = −1 + (r / h) ln [(1 + h / 2r) / (1−t)
h / 2r)] h = R2−R1 r is the radius of curvature of the centroid axis in the beam cross section when the ring formed by the stator core 28 is considered as a curved beam.

Here, the solid line circle 35 is the neutral axis radius R
Is a circle having a radius that is 4/3 times as large as An alternate long and short dash line ellipse 36 indicates an elliptic mode deformation of the stator core 28. A small solid line ellipse 37 indicates a locus of displacement (deformation) at an arbitrary point on the stator core 28 when the elliptic mode deformation of the stator core 28 rotates under the influence of the rotating magnetic field. Further, an arrow 38 indicates a trajectory of displacement (deformation) at a point at a radial position that is 4/3 times the neutral axis radius R when the elliptic mode deformation of the stator core 28 rotates under the influence of the rotating magnetic field. I have.

In this case, when the elliptical mode deformation 36 of the stator core 28 makes one rotation, any one of the
Since the locus of displacement at the point is an ellipse 37, it can be seen that this point is displaced (deformed) in both the radial direction and the tangential direction of the outer periphery of the stator core 28. In contrast, the general material mechanics approximation, in the neutral axis 4/3 of the radial position 35 of the radius R of the elliptical mode deformation of the ring, as indicated by arrow 38, in the radial direction It is derived that only displacement occurs and no tangential displacement of the outer periphery occurs.

Therefore, the eight axial ribs 29a to 29h
Axial rib 2 located above stator iron core 28
9a, the stator core 2 is located at a position 4/3 times the radius R of the neutral axis of the elliptic mode due to the magnetomotive force of the stator core 28.
The reinforcing ribs 31a to 31d are provided so as to extend in the tangential direction (horizontal direction in this case) of the outer periphery of
a to 31d, the side walls 24 of the stator frame body 22,
25, the tangential component of the elliptical mode deformation of the stator core 28, that is, the horizontal component, is transmitted to the side walls 24, 25 of the stator frame body 22 via the reinforcing ribs 31a to 31d. Nothing.

In other words, the axial rib 29a and the side wall 2
Even in a configuration in which the stator cores 4 and 25 are connected via the reinforcing ribs 31a to 31d, the horizontal component of the elliptical mode deformation of the stator core 28 can be prevented from being transmitted to the side walls 24 and 25 (vibration insulation can be achieved). In the above embodiment, the axial rib 29a and the side wall 2 are formed by the reinforcing ribs 31a to 31d.
4 and 25 are connected, so that the strength of the stator frame 21 can be sufficiently increased.

FIGS. 9 to 11 show the results of eigenvalue analysis in which the stator core support is modeled by the finite element method in order to simulate the elliptical deformation mode of the stator core 28. FIG. In this case, FIG. 9 illustrates the horizontal elliptical deformation mode, FIG. 10 illustrates the vertical elliptical deformation mode, and FIG. 11 illustrates the oblique elliptical deformation mode. Incidentally, FIG.
It is a figure which expands and shows the part shown with the circle 39 in FIG.11 (a). According to the above analysis result, the connection point between the reinforcing ribs 31a to 31d arranged at the position of 4/3 times the radius R of the neutral axis of the elliptical deformation of the stator core 28 and the axial rib 29a on the upper part of the stator frame 21 is: It can be seen that there is no displacement in the horizontal direction. That is, the vibration displacement of the horizontal direction component of the stator core 28 due to the elliptical deformation mode is caused by the side walls 24, 2
5 can be prevented (transmission of vibration displacement can be insulated).

FIGS. 12 to 17 show a third embodiment of the present invention, and the points different from the first embodiment will be described. The same parts as those of the first embodiment are denoted by the same reference numerals. In the third embodiment, as shown in FIGS. 12 and 13, the provision of the annular rib 30 of the first embodiment is omitted. Thus, the plurality of axial ribs 29
a to 29h without connecting the respective intermediate portions.
The strength of No. 1 does not decrease so much. That is, when the strength of the stator frame 21 is not required to be strong, the annular rib 30 need not be provided.

In the third embodiment, FIGS.
As shown in FIG. 3, the connecting walls 26 and 27 are composed of outer walls 26a and 27a for attaching a bearing bracket and inner walls 26b and 27 for connecting one end of each of the plurality of axial ribs 29a to 29h.
b. Then, the outer walls 26a, 2
7a and the inner walls 26b, 27b, connecting axial ribs 26d, 26e, 27d,
27e is provided. Here, the connecting axial rib 2
6d, 26e, 27d, 27e are a plurality of axial ribs 2
It is configured not to be arranged in a straight line with 9a to 29h. In the case of this configuration, the inner walls 26 of the connecting walls 26 and 27
b and 27b can be flexibly deformed.
Is transmitted to the inner walls 26b and 27b via the axial ribs 29a to 29h, and is absorbed here. Therefore, the electromagnetic vibration is generated by the connecting walls 26 and 27.
The amount transmitted to the outer walls 26a and 27a is reduced, and the operating noise can be reduced accordingly.

On the other hand, in the third embodiment, the arrangement positions of the plurality of axial ribs 29a to 29h, especially the arrangement positions of the two axial ribs 29f and 29g are different from those of the first embodiment. The difference will be specifically described with reference to FIG. First, as shown in FIG. 14, on the circumference 41 (in this case, the outer circumference of the stator core 28) passing through the plurality of axial ribs 29a to 29h arranged in a cylindrical shape, the axis C of the stator core is One of the intersections of the passing horizontal axis X and the circumference 41 (the right side in FIG. 14) is set to the position of 0 degree, the other (the left side) is set to the position of 180 degrees, and the position of the highest point of the circumference 41 is set to 90 degrees. Every time,
The position of the lowest point is defined as 270 degrees. When defined in this manner, the axial ribs 29a to 29h are arranged so as not to be disposed within the range of 210 to 330 degrees except for the lowermost point 270 degrees of the circumference 41. In the case of this configuration, the axial rib 29f is arranged at a position smaller than the position of 210 degrees of the circumference 41 (position slightly above 210 degrees), and the axial rib 29g is set at 330 degrees of the circumference 41. It is configured to be arranged at a position at an angle larger than the position (a position slightly above 330 degrees).

The two axial ribs 2 are located at the positions as described above.
It has been experimentally confirmed that when 9f and 29g are arranged, the amount of electromagnetic vibration generated in the stator core 28 transmitted to the side walls 24 and 25 of the stator frame 21 can be reduced. 17 will be described.

FIG. 15 shows the lowest point 27 of the circumference 41.
FIG. 11 is a diagram illustrating an elliptical deformation analysis result simulating electromagnetic vibration generated in the stator core 28 in an analysis model in which the axial ribs 42a and 42b are arranged within a range of 210 degrees to 330 degrees excluding 0 degree. From this FIG.
When the axial ribs 42a and 42b exist within the range of 0 degrees, the elliptical vibration in the 45 degrees direction causes the side walls 24 of the stator frame 21 to move.
It can be seen that a vibration amplitude (displacement) of 25 occurs. Also,
FIG. 16 is an ellipse simulating the electromagnetic vibration generated in the stator core 28 in the analysis model in which the axial ribs 42a and 42b are not disposed within the range of 210 to 330 degrees except for the lowermost point 270 degrees of the circumference 41. It is a figure showing the deformation analysis result.
From FIG. 16, the vibration amplitude (displacement) of the side walls 24 and 25 of the stator frame 21 caused by the elliptical vibration in the 45-degree direction when the axial ribs 42a and 42b do not exist within the range of 210 to 330 degrees is shown. It can be seen that it is reduced as compared with the configuration of FIG.

FIG. 17 is a graph in which the analysis results shown in FIGS. 15 and 16 are arranged. Specifically, the deformation rates (displacement rates) at the upper end portion 43a, the middle portion 43b, and the lower end portion 43c of the side wall 43 with reference to the axial rib 29c in FIG.
This is indicated by P3. Further, the upper end portion 44a and the middle portion 44 of the side wall 44 with reference to the axial rib 29c in FIG.
b, the deformation rate (displacement rate) at the lower end portion 44c is shown by white points Q1, Q2, and Q3 in FIG. In FIG. 17, the amplitude ratio (displacement ratio) is used as the deformation ratio (displacement ratio).

According to the graph of FIG. 17, the configuration in which the axial ribs 42a and 42b are not disposed within the range of 210 to 330 degrees except for the lowermost point 270 degrees of the circumference 41 (FIG. 16) is more suitable for the shaft. Configuration in which the directional ribs 42a and 42b are provided (FIG. 1)
5) that the amplitude ratio (displacement ratio) is small, in other words, the electromagnetic vibration generated in the stator core 28
It can be seen that the amount transmitted to one side wall 24, 25 is reduced.

The third embodiment having such a configuration has substantially the same basic configuration as that of the first embodiment, so that substantially the same functions and effects as those of the first embodiment can be obtained. In particular, in the third embodiment, as shown in FIG. 14, the plurality of axial ribs 29 a to 29 h arranged in a cylindrical shape are set in the range of 210 to 330 degrees except for the lowest point 270 degrees of the circumference 41. , The amount of electromagnetic vibration generated in the stator core 28 transmitted to the side walls 24 and 25 of the stator frame 21 can be reduced, and the operation noise can be reduced.

FIGS. 18 and 19 show a fourth embodiment of the present invention, and the points different from the first embodiment will be described. The same parts as those of the first embodiment are denoted by the same reference numerals. In the fourth embodiment, as shown in FIGS. 18 and 19, annular ribs 45, 46 are provided on both sides of the annular rib 30 of the first embodiment, and these annular ribs 45, 46 are provided.
Thus, the intermediate portions of the plurality of axial ribs 29a to 29h are connected. That is, in the fourth embodiment, three annular ribs 30, 45, and 46 are disposed so as to connect the intermediate portions of the plurality of axial ribs 29a to 29h. In this case, three annular ribs 30, 45,
Reference numeral 46 denotes a non-contact state with the side walls 24 and 25 of the stator frame 21. The configuration of the fourth embodiment other than the above is the same as the configuration of the first embodiment.

Therefore, in the fourth embodiment, the same operation and effect as in the first embodiment can be obtained. In particular, in the fourth embodiment, three annular ribs 30, 45, and 46 connecting the intermediate portions of the plurality of axial ribs 29a to 29h.
, The strength of the stator frame 21 can be further increased. Moreover, in this case, the three annular ribs 30, 45, 46 and the side wall 2 of the stator frame 21
Since the rotors 4 and 25 are configured so as to be in a non-contact state, the elliptical mode vibration of the stator core 28 is not transmitted to the side walls 24 and 25 of the stator frame 21, and the vibrations of the side walls 24 and 25 can be reduced. At the same time, driving noise can be reduced.

In the fourth embodiment, three annular ribs are provided. However, the present invention is not limited to this. Two or four or more annular ribs may be provided. good. Further, in the third embodiment, one or two or more annular ribs may be provided. In such a case, the strength of the stator frame 21 can be increased and the operation noise can be increased. Can be reduced.

FIGS. 20 and 21 show a fifth embodiment of the present invention, and the points different from the second embodiment will be described. The same parts as those of the second embodiment are denoted by the same reference numerals. In the fifth embodiment, as shown in FIGS. 20 and 21, instead of the reinforcing ribs 31a to 31d of the second embodiment, two reinforcing ribs 47 and 48 made of separate members are provided on the stator frame 21. Upper part of the side walls 24, 25 and the axial rib 29a
It is configured to be fastened and fixed to the upper part by bolts 49a to 49f. In this case, two reinforcing ribs 4
Reference numerals 7 and 48 are detachably attached to the stator frame 21.

In the case of the fifth embodiment, the side wall 2
A large number of screw holes for tightening and fixing bolts are formed along the axial direction in the upper portions of the fourth and 25 and the upper portion of the axial rib 29a. Thus, the mounting positions of the reinforcing ribs 47 and 48 can be shifted in the axial direction. Further, in the above configuration, it is possible to attach three or more reinforcing ribs, and it is also possible to attach only one reinforcing rib or not attach any reinforcing rib. In addition, the fifth other than the above
The configuration of this embodiment is the same as the configuration of the second embodiment.

Therefore, also in the fifth embodiment, the same operation and effect as in the second embodiment can be obtained. In particular, in the fifth embodiment, the reinforcing ribs 47 and 48 are provided on the stator frame 21 so as to be detachable and axially displaceable so that the mounting positions of the reinforcing ribs 47 and 48 are changed. In other words, the natural frequency of the stator frame 21 can be changed by changing the number of the reinforcing ribs 47 and 48 attached. As a result, it is possible to reliably prevent resonance from occurring due to electromagnetic vibrations generated in the rotating electric machine (stator core 28), and it is possible to improve vibration isolation.

Incidentally, the reinforcing ribs 4 in the fifth embodiment are used.
The configuration in which the attachments 7 and 48 are detachably attached may be applied to the third embodiment. Also in this configuration, the stator frame 2
1 can be increased, the natural frequency of the stator frame 21 can be changed, and the operating noise can be reduced.

FIGS. 22 and 23 show a sixth embodiment of the present invention, and the points different from the first embodiment will be described. The same parts as those of the first embodiment are denoted by the same reference numerals. In the sixth embodiment, as shown in FIGS. 22 and 23, a plurality of axial ribs 29a to 29g (29e,
29f are not shown), thin portions 29a1
To 29g1, the plurality of axial ribs 29
It is configured to give flexibility to a to 29g. Thereby, the natural frequency of the stator frame 21 is configured to be equal to or less than a (refer to Expression (1) of claim 8) Hz. The sixth configuration other than the above is the same as the configuration of the first embodiment.

Therefore, also in the sixth embodiment, the same operation and effect as in the first embodiment can be obtained. In particular, in the sixth embodiment, by providing flexibility to the plurality of axial ribs 29a to 29g, the natural frequency of the stator frame 21 is set to be equal to or less than a (see Expression (1)) Hz. With this configuration, it is possible to substantially prevent resonance due to electromagnetic vibration generated in the rotating electric machine (stator core 28).
As a result, the vibration isolation can be improved, and the operating noise can be reduced.

In the sixth embodiment, the plurality of axial ribs 29a to 29g are made flexible.
At least one of these axial ribs 29a to 29g
One or more axial ribs may be configured to have flexibility. Also, the configuration in which the plurality of axial ribs 29a to 29g in the sixth embodiment are made flexible so that the natural frequency of the stator frame 21 is equal to or less than a (see Expression (1)) Hz. This may be applied to the third embodiment. Also in the case of this configuration, the operation noise can be reduced similarly.

FIGS. 24 to 26 show a seventh embodiment of the present invention, and the points different from the third embodiment will be described. The same parts as those of the third embodiment are denoted by the same reference numerals. In the seventh embodiment, the number and positions of the plurality of axial ribs are different from those of the third embodiment.
This difference will be specifically described with reference to FIG.

That is, of the plurality of axial ribs 29a to 29h (see FIG. 14) arranged in a cylindrical shape in the third embodiment, three axial ribs 29a located above the stator core 28 are provided. , 29b and 29d are omitted, and the remaining five axial ribs 29c and 29e to 29h are connected to the stator core 2
8 is disposed below a horizontal plane passing through the axis C (that is, a horizontal axis X passing through the axis C). In this case, a pair of axial ribs 29c and 29e located at the uppermost portion are arranged along a horizontal plane passing through the axis C of the stator core 28, and a pair of axial ribs 29f and 29g located at the intermediate portion are arranged. , And a pair of axial ribs 29c and 29e located along the horizontal plane.

The axial ribs 29c and 29e to 29h
Is machined so that when the stator core 28 is assembled from above, the deviation between the axis C of the stator core 28 and the axis of the spigot of the bearing bracket mounting portion of the stator frame body 22 is reduced. ing.

In the seventh embodiment, the stator core 28
Is laminated with steel sheets punched into a predetermined shape,
The outer peripheral surfaces of these laminated steel plates are connected (caulked) by stator core fixing plates 50a to 50h made of a plurality of metals such as iron extending in the axial direction. Of the stator core fixing plates 50a to 50h, the protrusions 51a and 51b are integrally provided on the stator core fixing plate 50d located on the upper side in the vicinity of the axial rib 29c, and the axial rib 29e is provided.
Of the stator core fixing plate 50e located on the upper side near the
2a and 52b are integrally protruded.

In this case, the stator core 28 is
When assembled inside 9c and 29e to 29h, the protrusions 51a and 51b are configured to abut on the upper surface of the axial rib 29c, and the protrusions 52a and 52b are configured to abut on the upper surface of the axial rib 29e.

The stator core 28 is formed by fixing the stator core fixing plate 50h located at the lowermost portion to the bottom wall 23 of the stator frame main body 22.
(Axial rib 29h) so as to be fixed to the stator frame main body 22 by screwing.

In this embodiment, since the axial ribs 29c and 29e to 29h are disposed below a horizontal plane passing through the axis C of the stator core 28, the connecting walls 26, 2
7, recesses 26f, 27f are formed in the inner walls 26b, 27b instead of the through holes 26c, 27c (see FIG. 13). The lower half portions of the concave portions 26f and 27f are formed in a semicircular shape.

According to this embodiment having such a configuration, the plurality of axial ribs 29c and 29e to 29h are arranged below the horizontal plane passing through the axis C of the stator core 28, so that the stator core Since the stator core 28 can be incorporated into the plurality of axial ribs 29c and 29e to 29h from above, the stator core 28 can be easily assembled. Further, the stator core 28 incorporated inside the axial ribs 29c and 29e to 29h has the protrusions 51a and 51b abutting on the axial rib 29c and the protrusions 52a and 52b abutting on the axial rib 29e, respectively. It is stopped.

Conventionally, after a stator core is assembled into a plurality of cylindrical ribs disposed in a cylindrical shape, a man-hour is required to drive a stud into an outer peripheral portion of the stator core to prevent rotation. Had gone. On the other hand, in the seventh embodiment, the stator core 28 is incorporated from above, and the protrusions 51a, 51b and 52a, 52b are provided in advance on the outer peripheral portion of the stator core 28, and these protrusions are provided. Since the stator core 28 incorporated inside the axial ribs 29c and 29e to 29h is stopped by the portions 51a, 51b and 52a, 52b, the tacking work is not required, and the productivity is improved.

FIG. 27 to FIG. 30 show an eighth embodiment of the present invention, and the points different from the seventh embodiment will be described. The same parts as those in the seventh embodiment are denoted by the same reference numerals. In the eighth embodiment, FIGS.
0, the outermost surface of the stator core 28 has
The connection blocks 53a and 53b serving as connection members are provided apart from each other in the axial direction. These connecting blocks 53
a and 53b have screw holes 54a and 54b on the upper surface, respectively, and are provided integrally with the stator core fixing plate 50a located at the uppermost part of the stator core 28. These connecting blocks 53a and 53b are connected to the side walls 24 and 25 by connecting plates 55a and 55b.

The connecting plates 55a, 55b are connected to the side walls 24, 25.
And the upper portions of the connection blocks 53a and 53b are fastened and fixed by bolts 56a to 56f. In this case, the connecting plates 55a and 55b are configured to be detachably attached to the connecting blocks 53a and 53b and the side walls 24 and 25. Therefore, after incorporating the stator core 28 into the axial ribs 29c and 29e to 29h, the connection block 5 located above the stator core 28
3a, 53b and side walls 24, 25 with connecting plates 55a, 55
b is tightened and fixed by bolts 56a to 56f, so that the stator core 28 (the connection blocks 53a and 53b) is fixed.
And the side walls 24 and 25 are connected.

In this case, screw holes for tightening and fixing bolts 56a, 56d, 56e, 56f are provided in the upper portions of the side walls 24, 25. Further, the stator core 28 is connected to the side walls 2 by the connecting plates 55a and 55b.
In this embodiment, the stator core 28 is connected to the bottom wall 2
3, screwing is omitted.

Further, in this embodiment, the connecting plate 5
The connecting blocks 53a, 53b are attached to the connecting blocks 53a, 53b such that the connecting blocks 53a, 55b are attached to the neutral axis 4/3 times the radius R of the elliptic mode deformation due to the magnetomotive force of the stator core 28. An upward protruding height dimension is defined. The configuration of the eighth embodiment other than that described above is as follows.
This is similar to the seventh embodiment.

Therefore, in the eighth embodiment, the following operation and effect can be obtained in addition to the operation and effect of the seventh embodiment. That is, the stator core 28 is
9c and 29e to 29h, the connecting plates 55a and 55b are fastened and fixed to the connecting blocks 53a and 53b to connect to the side walls 24 and 25. 29c and 29e ~
29h and the connecting plates 55a and 55b are sandwiched and supported, so that the supporting strength of the stator core 28 can be increased. Further, the side walls 2 are formed by the connecting plates 55a and 55b.
4 and 25 are connected, so that the strength of the stator frame main body 22 can be increased.

Further, the stator core 28 is connected to the connecting plate 55a,
Even when the connecting plates 55a and 55b are connected to the side walls 24 and 25 by 55b, the connecting plates 55a and 55b are connected to the connecting blocks 53a and 53b by 4/3 times the neutral axis radius R of the elliptic mode deformation due to the magnetomotive force of the stator core 28. Is provided so as to extend in the tangential direction of the outer periphery of the stator core 28 at the position
4, 25 can be prevented.

Further, in the case of the above embodiment, the stator core 28
Connecting plates 55a, 55b
Are fixed by bolts, and these connecting plates 55a, 55
b is connected to the side walls 24 and 25 of the stator frame main body 22 by bolting. For this reason, the side walls 24, 2
The screw holes for bolting provided in the upper part of the fifth member 5 enable simple and accurate positioning of the stator core 28 in the axial direction.

In the eighth embodiment, the two connecting blocks 53a and 53b and the connecting plates 55a and 55b are provided. However, the present invention is not limited to this, and one or three or more connecting blocks and You may comprise so that a connection plate may be provided.

FIG. 31 shows a ninth embodiment of the present invention, and the points different from the eighth embodiment will be described.
The same parts as those in the eighth embodiment are denoted by the same reference numerals. In this embodiment, a connection ring 57 is provided on the outer periphery of the stator core 28 as a connection member. The connection ring 57 is formed by connecting a metal plate such as a band-shaped iron or the like to the protrusions 51a,
It is wound around the outer peripheral surface of the stator core 28 so as to be located between the protrusion 2a and the protrusions 51b and 52b (see FIG. 27). The connecting ring 57 is provided with bolts 58a to 58d.
, And is fixed to the stator core fixing plate 50a by welding or the like while being fixed to the stator core fixing plates 50b to 50e.

Further, one end 57a of the connecting ring 57, which protrudes upward above the stator core 28, is provided.
, Connecting plates 59a and 59b are connected by bolts 60a and nuts 60b. In this case, the connecting plate 59
a, 59b is at one end portion 57a of the connection ring 57, in the elliptical mode deformation by the magnetomotive force of the stator core 28
The stator core 28 is provided at a position that is 4/3 times the radius R of the vertical axis so as to extend in a tangential direction on the outer periphery of the stator core 28.

Although not shown, the inner surfaces of the axial ribs 29c and 29e to 29h have the axial ribs 29c and 2e.
When the stator core 28 is assembled inside 9e to 29h, for example, a groove is provided in which the connecting ring 57 is fitted.

In the ninth embodiment having such a configuration, the basic configuration is substantially the same as that of the eighth embodiment, so that substantially the same operation and effects as those of the eighth embodiment can be obtained.

FIGS. 32 and 33 show the tenth embodiment of the present invention, and the points different from the seventh embodiment will be described. The same parts as those in the seventh embodiment are denoted by the same reference numerals. In the tenth embodiment, the protrusions 51a, 51b, 52a, 52 provided on the outer peripheral portion of the stator core 28 are provided.
b is configured to abut on notches 61a to 61d formed on the upper surfaces of the axial ribs 29c and 29e, respectively. Specifically, the notches 61a to 61d are formed at the corners between the inner peripheral surfaces of the axial ribs 29c and 29e and the upper surface (only the notches 61c and 61d are shown in FIG. 32), and the stator core 28 Are the axial ribs 29c and 29
e-29h, when incorporated into the interior,
51b and 52a, 52b are located in the notches 61a to 61d, and are configured to contact the inner bottom surfaces of the notches 61a to 61d.

The axial ribs 29c and 29e are provided with elongated through holes 62 penetrating in the radial direction from the outer peripheral surface toward the notches 61a to 61d. On the other hand, protrusion 5
Screw holes are formed in the end faces of 1a, 51b and 52a, 52b (not shown). In this case, the bolts are passed through the through holes 62 of the axial ribs 29c and 29e to project the protrusions 51.
The stator iron core 28 is fixed to the axial ribs 29c and 29e by screwing into the screw holes of a, 51b, 52a and 52b.

In the tenth embodiment having such a configuration, since the basic configuration is substantially the same as that of the seventh embodiment, it is possible to obtain substantially the same functions and effects as those of the seventh embodiment. In particular, in the tenth embodiment, the axial ribs 29c and 29e-2
When the stator core 28 is assembled inside the 9h, the protrusion 5
1a, 51b and 52a, 52b are notches 61a-61.
d, the stator core 2
8 can be easily and accurately positioned at the assembling position in the axial direction, and the assembling workability is improved.

FIG. 34 shows an eleventh embodiment of the present invention, and the differences from the eighth embodiment will be described.
The same parts as those in the eighth embodiment are denoted by the same reference numerals. In the eleventh embodiment, the pair of iron core connecting axial ribs 63a, 63 is provided above the pair of connecting walls 26, 27 of the stator frame body 22 so as to be separated from the side walls 24, 25.
b is provided. In this case, both ends of the pair of core connecting axial ribs 63a, 63b are integrally connected to inner walls 26b, 27b of the connecting walls 26, 27.

Both ends of the connecting plates 55a, 55b connected to the connecting blocks 53a, 53b provided on the outer peripheral surface of the stator core 28 are positioned above the pair of core connecting axial ribs 63a, 63b. Are linked.

In this configuration, since the connecting plates 55a, 55b connected to the stator core 28 and the side walls 24, 25 are in a non-contact state, the vibration of the stator core 28 in the elliptic mode is reduced by the stator frame main body 22. Is not transmitted to the side walls 24, 25, so that the vibration of the side walls 24, 25 can be further reduced, and the operating noise can be further reduced.

The side wall 2 is provided above the stator frame main body 22 between the pair of connecting walls 26 and 27 in the eleventh embodiment.
A configuration in which a pair of iron core connecting axial ribs 63a and 63b are provided so as to be separated from the fourth and fourth cores may be applied to the ninth embodiment. Also in the case of this configuration, the operation noise can be reduced similarly.

[0093]

As is apparent from the above description, the present invention provides a plurality of axial ribs for fitting and supporting a stator core in the form of a bridge between the inner walls of a connecting wall of a stator frame main body. Since the intermediate portion of the directional rib and the side wall of the stator frame body are configured to be in a non-contact state, the vibration of the stator core in the elliptical mode is not transmitted to the side wall, and the vibration of the side wall can be reduced and the operation noise can be reduced. Ru can be reduced. In addition, the connection wall
An axial rib for connecting an inner wall and an outer wall and the plurality of
Make sure that the axial ribs are not aligned with
Whether the inner wall of the connecting wall is configured to be flexibly deformable
The electromagnetic vibration generated in the stator core is transmitted to the outer wall of the connecting wall.
The operating noise can be reduced.
Can be done. Moreover, there is an excellent effect that the work of aligning the axis of the stator core and the axis of the bearing bracket attached to the stator frame body can be easily performed.

In the case of the above configuration, a plurality of axial ribs are formed by a horizontal axis and a vertical axis passing through the axis in a plane orthogonal to the axis of the stator core, and a two-axis obtained by rotating these two axes by 45 degrees. Are arranged so that the moments of inertia on both sides of each of the four axes fall within the range of ± 10%. Therefore, the axis of the stator core and the bearing of the stator frame main body are arranged. The deviation of the bracket mounting portion from the shaft center of the spigot can be made small, and the eccentricity of the air gap of the iron core portion in the rotating electric machine can be reduced. In this case, the secondary processing of the spigot of the bearing bracket mounting portion of the stator frame main body becomes unnecessary, so that the productivity can be further improved.

Further, except for a pair of axial ribs vertically sandwiching the stator core among the plurality of axial ribs, other axial ribs are arranged at positions asymmetric with respect to the axis of the stator core. With the configuration, the tension between the axial ribs can be avoided, and therefore, the deformation of the stator frame can be reduced, and the amount of electromagnetic vibration generated in the stator core transmitted to the fixed support frame can be reduced. . Furthermore, since the stator core is press-fitted into the plurality of axial ribs, the center of the stator core and the center of the spigot of the bearing bracket mounting portion of the stator frame body are concentrically aligned. Adjustment work can be dispensed with, and manufacturability can be further improved.

On the other hand, among the plurality of axial ribs, the axial rib located above the stator core is located at a position 4/3 times the radius of the neutral axis of the elliptic mode deformation due to the magnetomotive force of the stator core. The reinforcing ribs are provided so as to extend in the tangential direction of the outer periphery of the iron core, and the reinforcing ribs are connected to the side walls, so that the horizontal component of the elliptic mode deformation of the stator core is fixed to the stator frame via the reinforcing ribs. Transmission to the side wall of the main body can be prevented. In this configuration, the strength of the stator frame can be increased by providing the reinforcing ribs. In the case of this configuration, if the reinforcing ribs are provided on the stator frame so that they can be attached to and detached from the stator frame and can be mounted with their positions shifted in the axial direction, the natural frequency of the stator frame can be changed by changing the mounting position of the reinforcing ribs. it can.

One or more annular ribs are provided so as to connect intermediate portions of the plurality of axial ribs, and the annular ribs and the side walls of the stator frame are configured to be in a non-contact state. The strength of the stator frame can be increased. In addition, in this case, since the annular rib and the side wall of the stator frame main body are in a non-contact state, it is possible to prevent the elliptical mode vibration of the stator core from being transmitted to the side wall, and to reduce the operation noise. Further, if the plurality of axial ribs are made flexible so that the natural frequency of the stator frame is equal to or lower than a (refer to the expression (1) in claim 8) Hz, the rotating electric machine generates Since the resonance hardly occurs due to the electromagnetic vibration, the anti-vibration property can be improved.

Furthermore, on the circumference passing through the plurality of axial ribs arranged in a cylindrical shape, the lowest point 2
If the axial ribs are not arranged within the range of 210 to 330 degrees except 70 degrees, the amount of electromagnetic vibration generated in the stator core transmitted to the side wall of the stator frame can be reduced, and Noise can be reduced .

When the plurality of axial ribs are arranged below a horizontal plane passing through the axis of the stator core, the stator core can be assembled into the axial rib from above. The assemblability is improved. In the case of this configuration, when the outer peripheral portion of the stator core is provided with protrusions respectively abutting on the upper surfaces of a pair of axial ribs located at the uppermost portion of the plurality of ribs, the protrusions allow the stator core to be provided. Can be stopped. In this case, by inserting the stator core from above, a protrusion can be provided in advance on the stator core, so conventionally, the stator core has been assembled into the axial ribs and then stopped for detent. In addition, a relatively labor-intensive tacking operation is not required, and the manufacturability is improved.

Further, the protrusions provided on the outer peripheral portion of the stator core are brought into contact with the notches formed on the upper surface side of the pair of axial ribs located at the uppermost position among the plurality of axial ribs. With such a configuration, the stator core can be prevented from rotating by the protrusion located in the notch, and the positioning work of the stator core in the axial direction can be easily performed. Is improved.

On the other hand, when a connecting member is provided above the outer peripheral surface of the stator core, and the connecting member and the upper portion of the side wall are connected by a connecting plate, the stator core is formed in a horizontal plane passing through its axis. Since the supporting member can be supported so as to be sandwiched between the axial rib located on the lower side and the connecting plate, the supporting strength of the stator core is improved. Moreover, the positioning of the stator core in the axial direction can be easily performed by the connecting plate.
By providing the connecting plate between the side walls, the strength of the stator frame can be increased.

Alternatively, a pair of core connecting axial ribs are provided above the connecting walls of the stator frame main body so as to be separated from the side walls, and the connecting member and the pair of core connecting axial ribs are connected. If it is configured to be connected by a plate, even if the electromagnetic vibration generated in the stator core is transmitted to the core connecting axial rib through the connection plate, it is absorbed here, so that the electromagnetic vibration is not transmitted to the side wall, so that Driving noise is reduced.

Further, when the connecting plate is provided on the connecting member at a position which is 4/3 times the radius of the neutral axis of the elliptic mode deformation due to the magnetomotive force of the stator core, as described above. In addition, since a component in the tangential direction of the elliptical mode deformation of the stator core does not occur at a position that is 4/3 times the radius of the neutral axis , the component in the tangential direction of the elliptic mode deformation of the stator core passes through the connecting plate. Transmission to the side wall of the stator frame main body or the axial rib for iron core connection can be prevented.

[Brief description of the drawings]

FIG. 1 is a top view of a stator frame showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a stator frame.

FIG. 3 is a longitudinal sectional view taken along the line III-III in FIG.

FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG.

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

FIG. 6 is a longitudinal sectional view taken along the line VI-VI in FIG.

FIG. 7 is a diagram corresponding to FIG. 2;

FIG. 8 is a schematic view of an elliptic mode vibration caused by a magnetomotive force distribution of a stator core.

FIG. 9 is a diagram illustrating a horizontal elliptical deformation mode of a stator core and a stator frame.

FIG. 10 is a diagram showing a vertical elliptical deformation mode of a stator core and a stator frame.

FIG. 11 is a diagram illustrating an oblique elliptical deformation mode of a stator core and a stator frame.

FIG. 12 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;

FIG. 13 is a diagram corresponding to FIG. 2;

FIG. 14 is a diagram corresponding to FIG. 3;

FIG. 15 is a view showing an elliptical deformation analysis result simulating electromagnetic vibration of a stator core;

FIG. 16 is a view showing an elliptical deformation analysis result simulating electromagnetic vibration of a stator core;

FIG. 17 is a graph showing the amplitude ratio of each portion of the side wall of the stator frame.

FIG. 18 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention.

FIG. 19 is a diagram corresponding to FIG. 2;

FIG. 20 is a view corresponding to FIG. 5, showing a fifth embodiment of the present invention;

FIG. 21 is a diagram corresponding to FIG. 6;

FIG. 22 is a view corresponding to FIG. 1, showing a sixth embodiment of the present invention;

FIG. 23 is a longitudinal sectional view taken along line LL in FIG. 22;

FIG. 24 is a view corresponding to FIG. 12, showing a seventh embodiment of the present invention;

FIG. 25 is a diagram corresponding to FIG. 13;

FIG. 26 is a sectional view taken along the line MM in FIG. 24;

FIG. 27 is a view corresponding to FIG. 24 showing an eighth embodiment of the present invention.

FIG. 28 is a diagram corresponding to FIG. 25;

FIG. 29 is a diagram corresponding to FIG. 26;

FIG. 30 is a perspective view of a stator core.

FIG. 31 is a longitudinal sectional view of a stator core according to a ninth embodiment of the present invention.

FIG. 32 is a perspective view showing a tenth embodiment of the present invention, in which a part of a stator frame is cut away.

FIG. 33 is a diagram corresponding to FIG. 24;

FIG. 34 is a view corresponding to FIG. 28 showing an eleventh embodiment of the present invention.

FIG. 35 is a diagram corresponding to FIG. 1 showing a conventional configuration.

FIG. 36 is a longitudinal sectional view taken along line JJ in FIG. 35;

FIG. 37 is a longitudinal sectional view taken along the line KK in FIG. 35;

FIG. 38 is a longitudinal sectional view showing a different conventional configuration.

[Explanation of symbols]

21 is a stator frame, 22 is a stator frame main body, 23 is a bottom wall, 2
4, 25 are side walls, 26, 27 are connection walls, 26a, 27a
Is the outer wall, 26b, 27b is the inner wall, 26c, 26d, 27
c and 27d are connecting axial ribs, 28 is a stator core, 2
9a to 29h are axial ribs, 30 is an annular rib, 31a
31d is a reinforcing rib, 41 is a circumference, 42a and 42b are axial ribs, 43 and 44 are side walls, 45 and 46 are annular ribs, 47 and 48 are auxiliary ribs, 49a to 49f are bolts,
51a, 51b, 52a, 52b are protrusions, 53a, 53
b is a connecting block (connecting member), 55a, 55b, 5
9a and 59b are connecting plates, 57 is a connecting ring (connecting member), 61a to 61d are notches, and 63a and 63b are axial ribs for connecting the iron core.

Continuation of front page (56) References JP-A-5-304742 (JP, A) JP-A-49-77109 (JP, A) JP-A-63-224648 (JP, A) JP-A-56-101344 (JP, A) , A) Japanese Utility Model Sho 55-109353 (JP, U) Japanese Utility Model Sho 59-97568 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 5/24 H02K 1/12 H02K 1/18

Claims (15)

(57) [Claims] 1. A stator frame in which a plurality of axial ribs extending in the axial direction are arranged in a cylindrical shape inside a stator frame main body, and a steel plate laminated on the stator frame. A stator of a rotating electrical machine having a stator core fitted and supported, wherein the stator frame main body includes a bottom wall, side walls erected on both ends in radial directions of the bottom wall, and the bottom. A configuration having a connecting wall erected on both end sides in the axial direction of the wall and connecting each end of the both side walls, and the connecting wall, an outer wall, an inner wall, the outer wall and the inner wall,
Axial ribs provided to connect the two
And a bearing bracket is attached to the outer wall, and the plurality of axial ribs are provided in a bridge-like manner between the inner walls, and an intermediate portion of the plurality of axial ribs and the side wall are in a non-contact state. together configured to be, Kazunao and said connecting axial ribs and the plurality of axial ribs
A stator for a rotating electric machine, wherein the stator is not arranged on a line . 2. The method according to claim 1, wherein the plurality of axial ribs are formed by a horizontal axis and a vertical axis passing through the axis in a plane perpendicular to the axis of the stator core, and two axes obtained by rotating the two axes by 45 degrees. Bend on both sides of each of these four axes
The stator according to claim 1, wherein the second moment of area, which is a parameter representing the effect of the shape of the rigidity, is arranged within a range of ± 10%. 3. Except for a pair of axial ribs vertically sandwiching the stator core among the plurality of axial ribs, other axial ribs are positioned asymmetrically with respect to the axis of the stator core. The stator for a rotating electric machine according to claim 1, wherein the stator is disposed in a direction. 4. The stator for a rotary electric machine according to claim 1, wherein said stator core is press-fitted inside said plurality of axial ribs. 5. An axial rib located above the stator core of the plurality of axial ribs, wherein a radius of a neutral axis of an elliptic mode deformation due to a magnetomotive force of the stator core is 4%.
5. A structure according to claim 1, wherein a reinforcing rib is provided at a position of / 3 times in a tangential direction of an outer periphery of said stator core, and said reinforcing rib is connected to said side wall. The stator of the rotary electric machine according to claim 1. 6. The method according to claim 1, wherein one or more annular ribs are provided so as to connect intermediate portions of the plurality of axial ribs, and the annular rib and the side wall are in a non-contact state. The stator for a rotating electric machine according to any one of claims 1 to 5, wherein: 7. The stator for a rotary electric machine according to claim 5, wherein said reinforcing rib is provided on said stator frame so as to be detachable and attachable with its position shifted in an axial direction. 8. The stator frame according to claim 1, wherein the plurality of axial ribs have flexibility so that a natural frequency of the stator frame is equal to or lower than a Hz. A stator for a rotary electric machine according to any of the claims. Here, the numerical value a is defined by the following equation. (Equation 1) Here, b is 100 Hz or 120 Hz which is a fundamental frequency component of the electromagnetic vibration generated in the rotating electric machine. 9. On a circumference passing through the plurality of axial ribs arranged in a cylindrical shape, one of the intersections of a horizontal axis passing through the axis of the stator core and the circumference is 0 degree, and the other is 180 degrees. Degrees, the highest point of the circumference is 90 degrees, and the lowest point is 2 degrees.
70 degrees, excluding the lowest point of the circumference 270 degrees 2
The stator for a rotating electric machine according to any one of claims 1 to 8, wherein the axial rib is not arranged within a range of 10 degrees to 330 degrees. 10. The stator according to claim 1, wherein said plurality of axial ribs are connected to said stator.
Characterized in that from the horizontal plane passing through an axis of the core was arranged below
The stator for a rotating electric machine according to claim 1, wherein 11. The stator according to claim 11, wherein the outer periphery of the stator core is
A pair of axial ribs located at the top of the number of axial ribs
There are protrusions on the upper surface of the
The stator for a rotating electric machine according to claim 10, wherein: 12. A stator provided on an outer peripheral portion of said stator core.
The protrusion is located at the top of the plurality of axial ribs
Notches formed respectively on the upper surface side of a pair of axial ribs
The rotating electric machine according to claim 11, wherein the rotating electric machine contacts the rotating electric machine.
Stator . 13. An upper part of an outer peripheral surface of said stator core for connection.
A member is provided, and the connecting member is connected to the upper portion of the side wall.
2. A method according to claim 1, wherein said first and second plates are connected by a plate.
3. The stator of the rotating electric machine according to any one of 2 . 14. A connecting part on an upper part of an outer peripheral surface of said stator core.
A member is provided, and the side wall is provided at an upper portion between connection walls of the stator frame.
A pair of axial ribs for connecting the iron cores
The connecting member and the pair of iron core connecting axial ribs.
And (f) are connected by a connecting plate.
13. The stator of the rotary electric machine according to any one of claims 12 to 12. 15. The connector according to claim 15, wherein the connecting plate is provided on the connecting member.
The elliptic mode deformation due to the magnetomotive force of the stator core
It is characterized by being provided at a position 4/3 times the radius of the vertical shaft
The stator of a rotating electric machine according to claim 13 or 14, wherein: