JPH08182246A - Electric rotating machine - Google Patents

Abstract

PURPOSE: To reduce noise by reducing the vibration being transmitted from the body of an electric rotating machine through the leg part thereof to the outside. CONSTITUTION: Metal leg parts 21 are welded to the outside of a tubular steel plate frame 1 symmetrically to the lowermost bottom part as a center. The leg part 21 comprises an installation seat 22 and a pair of posts 23a, 23b extending from the opposite ends thereof wherein the post 23b, provided on the outside in the circumferential direction, is formed narrower than the installation seat 22. The installation seat 22 is provided with ribs 26, 26 formed, while being spaced apart in the axial direction, by bending the opposite fringe part upward in order to enhance the rigidity against deformation in the lateral direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine in which vibration of the main body of the rotary electric machine is reduced during operation.

[0002]

2. Description of the Related Art A rotary electric machine, for example, an electric motor has conventionally been provided with a structure shown in FIGS.

That is, a stator 3 around which a stator coil 2 is wound is attached by press-fitting to the inner periphery of a frame 1 made of a cylindrical steel plate, and a rotor 4 is inserted inside the stator 3. Has been done. A rotary shaft 5 having the rotor 4 mounted thereon is supported by bearing brackets 6 and 6 on both sides via bearings 7 and 7, respectively.
Are attached to both axial ends of the. So, frame 1
A pair of steel plate legs 8 for attaching and fixing the electric motor main body to a predetermined portion are provided symmetrically around the bottom of the bottom of the. As shown in FIGS. 7 and 8, the leg portion 8 includes a mounting seat 10 fixed to a mounting portion (not shown) such as a machine by bolts 9 and a pair of support columns 11 a and 11 b extending from both ends of the mounting seat 10. It consists of and. Of the pair of struts 11a and 11b, the struts 11b on the outer side in the circumferential direction
Is formed to be narrower than the width of the mounting seat 10, and the upper ends of the columns 11a and 11b are separated from each other in the circumferential direction of the frame 1 and fixed by welding.

In the above structure, when an alternating current is passed through the stator coil 2, a rotating magnetic field is generated by the stator 3, a current flows through the conductor of the rotor 4 to generate a rotating torque, and at the same time, the stator 3 and the rotor 4 are rotated. A radial electromagnetic force acts between the magnetic field and the magnetic field due to the magnetic attraction force. This electromagnetic force acts as a vibrating force to vibrate the stator 3 and thus the frame 1. This vibration is generated by the radial excitation force of the electric motor main body, but since the installation seat 10 of the leg portion 8 is fixed to the installation portion by the bolt 9, the above-mentioned vibration is mainly indicated by an arrow in FIG. It appears as horizontal (right and left) vibration of the frame 1 shown.

Due to the vibration of the frame 1, the columns 11a,
11b is bent and deformed in the left-right direction as shown by the broken line in FIG. Further, the mounting seats 10 extend from the mounting seats 10 in accordance with the above-described deformations of the supporting pillars 11a and 11b.
7 and the left and right sides of the bolt 9 are flexibly deformed as shown by the broken line in FIG. 7. Particularly, as in the above-described configuration, the edge portion of the mounting seat 10 on the side of the column 11b which is formed narrower than the width of the mounting seat 10 is As shown by the two-dot broken line in FIG. 6, the bolt 9 is lifted between the two bolts 9 to be flexibly deformed.

Therefore, the vibration of the frame 1 in the left-right direction can be reduced by suppressing the bending deformation seen in the columns 11a and 11b of the leg portion 8 and the installation seat 10 described above. It is conceivable to increase the rigidity and the rigidity.

[0007]

However, in this case, since the plate thickness of the leg portion 8 increases, the weight of the entire rotary electric machine also increases, which is not preferable from the viewpoint of downsizing and weight reduction. Further, since the plate thickness of the columns 11a and 11b is increased, the column 1
Since the work time required for welding 1a and 11b to the frame 1 becomes long, the welding distortion becomes large and the frame 1
Inner diameter accuracy deteriorates. Therefore, there is a problem that the increase in the rigidity of the leg portion 8 by increasing the plate thickness is limited.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotating electric machine capable of sufficiently reducing the vibration of the frame in the left-right direction without increasing the plate thickness of the legs. It is in.

[0009]

In order to achieve the above object, a rotating electric machine according to the present invention comprises a metal frame, a mounting seat fixed to a mounting portion by a fastening member, and extending from both ends of the mounting seat. And a pair of metal legs composed of a pair of stanchions whose upper ends are fixed to the frame so as to be separated from each other in the circumferential direction, and both edges of the installation seat that are separated from each other in the axial direction of the frame. The part is bent upward to form a rib (claim 1). In this case, in place of the rib formed on the installation seat, it is preferable that at least one of the pair of columns is bent at both edges to form the rib (claim 2).

In addition to the above structure, at least one of the pair of columns is formed narrower than the width of the mounting seat,
The ribs are formed by bending the edges of the narrow column on both sides in the width direction so as to be bent upward (claim 3).

In this case, in addition to the ribs formed by bending upward the edge portions on both sides in the width direction of the narrow column of the installation seat, both edge portions existing apart in the axial direction of the frame are upward. It is preferable that the rib is bent to form a rib (claim 4).

[0012]

According to the above-mentioned means, both edges of the mounting seat, which are separated from each other in the axial direction of the frame, are formed with the bending ribs upward, so that the plate can be prevented from being deformed in the vertical direction without increasing the plate thickness. Since the rigidity is increased, the horizontal vibration of the frame can be suppressed (claim 1).

In this case, instead of the ribs formed on both edges of the frame of the installation seat, which are separated from each other in the axial direction, the ribs are formed by bending both edges of at least one of the pair of columns. As a result, the rigidity of the pillar is increased,
It is possible to suppress the deformation of the column (claim 2).

If at least one of the pair of columns is formed to have a width smaller than that of the mounting seat,
By forming bending ribs upward on the edges of the mounting seats existing on both sides in the width direction of the narrow pillar, the rigidity against upward bending deformation of this portion is increased (claim 3).

Further, in addition to the edges on both sides in the width direction of the narrow strut of the installation seat, both edges apart from each other in the axial direction are also bent upward to form ribs, so that any part is raised. Since the rigidity with respect to the bending deformation of the seat is increased, the deformation of the mounting seat can be suppressed as much as possible. (Claim 4)

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a rotary electric machine, for example, an electric motor will be described below with reference to FIGS. First, FIG. 1 shows a semi-longitudinal side view of the overall configuration of the electric motor main body. The same parts as those in FIG. 6 are designated by the same reference numerals and explained, and a metal steel plate is formed into a cylindrical shape. A stator 3 around which a stator coil 2 is wound is attached by press-fitting to the inner periphery of the frame 1 formed as described above, and a rotor 4 is inserted inside the stator 3. The rotating shaft 5 having the rotor 4 mounted thereon is supported by bearing brackets 6 and 6 on both sides via bearings 7 and 7, respectively.
6 are attached to both axial ends of the frame 1. With the above, an electric motor main body which is a rotary electric machine main body is configured.

Thus, a pair of metal legs 21 and 21 for supporting the weight of the entire electric motor on the outside of the frame 1 and for mounting and fixing the electric motor main body at a predetermined position of the installation portion.
However, they are joined by welding at symmetrical positions with respect to the bottom bottom of the frame 1. The leg portion 21 includes a mounting seat 22 and a pair of support columns 23 a, 23 extending from both ends of the mounting seat 22.
b, the mounting seat 22 is provided with two through holes 24, 24 axially separated from each other.
A bolt 25 as a tightening member is inserted through the screw 4 and is fixedly attached to an installation portion (not shown) such as a machine. Further, of the pair of columns 23a and 23b, the column 23b on the outer side in the circumferential direction is formed to be narrower than the width of the installation seat 22.
The upper ends of a and 23b are separated from each other in the circumferential direction of the frame 1 and fixed by welding.

By the way, as shown in FIG. 2, the installation seat 22 is provided with ribs 26, 26 by bending both edges of the installation seat 22 which are present apart from each other in the axial direction of the frame. . Therefore, the rigidity of this portion is increased, and upward bending deformation is less likely to occur.

Next, the operation of this embodiment will be described. When the electric motor is energized, an alternating current flows in the stator coil 2, a rotating magnetic field is generated by the stator 3, a current flows in the conductor of the rotor 4 and a rotating torque is generated, and at the same time, the stator 3 and the rotor 4 are rotated.
A radial electromagnetic force acts between the magnetic field and the magnetic field due to the magnetic attraction force. This electromagnetic force acts as a vibrating force to vibrate the stator 3 and thus the frame 1. This vibration is mainly horizontal (right and left) vibration and is transmitted from the stator 3 to the frame 1,
Further, it is transmitted to the leg portion 21.

The vibrations transmitted to the leg portions 21 cause the columns 23b on the outer side in the circumferential direction to bend and deform to the left and right, and at the same time, the mounting seat 22.
Lift up. At the same time, this vibration flexes and deforms the column 23a on the inner side in the circumferential direction to the left and right.
Since the ribs 26, 26 are formed on the edges and the edges of the mounting seat 22 that are apart from each other in the axial direction have high rigidity against vertical deformation, the mounting seat 22 does not bend upward,
It remains flat. Therefore, the horizontal amplitude of the column 23a is reduced, and as a result, the horizontal swing width of the frame 1 is also reduced.

Thus, according to this embodiment, the mounting seat 22
Since ribs 26, 26 are provided at both edge portions in the axial direction of the to increase the rigidity against deformation in the vertical direction and suppress the swing width of the columns 23a, 23b in the left-right direction, the leg portion 21 is driven when the motor is driven. The electric motor main body can be supported so that the frame 1 and the like are less likely to vibrate. Moreover, since the rigidity can be increased without increasing the plate thickness of the leg portion 21, the weight of the entire electric motor is hardly affected, and the leg portion 21 is
The working time required to weld the to the frame 1 does not change.

FIG. 3 shows a second embodiment of the present invention,
The parts different from the first embodiment omit the ribs 26 provided on the installation seat 22 and form the legs 27 on the outer circumferential side of the support column 2.
That is, both edges of 8b are bent to form ribs 29, 29. In this case, the horizontal vibration generated in the frame 1 and transmitted to the leg portion 27 when the electric motor is driven causes the support column 28b to be bent and deformed to the left and right, but since the rigidity of the support column 28b is increased by the ribs 29, 29, the support column 28b is increased. The amplitude in the left-right direction becomes smaller.

Therefore, according to this embodiment, since the ribs 29, 29 are provided on both edges of the support column 28b to increase the rigidity,
Of the deformation of the legs 27 due to the vibration generated in the frame 1,
In particular, it is possible to reduce the flexural deformation of the column 28b and the flexural deformation of the column 28a, and to reduce the vibration amplitude of the frame 1.

In the first and second embodiments, the pair of columns 23a and 23 forming the legs 21 and 27 are formed.
The outer columns 23b, 28b of b, 28a, 28b are formed to be narrower than the width of the mounting seat 22, but any of them may be formed to be narrower. In addition, the ribs are formed on both columns 23a, 23
It may be formed on both edges of b, 28a, 28b. By doing so, it is more effective in preventing the bending deformation of the columns 28a, 28b.

FIG. 4 shows a third embodiment of the present invention.
In the present embodiment, unlike the second embodiment, among the installation seats 31 constituting the leg portion 30, the edges existing on both widthwise sides (both axially opposite sides of the frame 1) of the outer support columns 32b which are narrower than the installation seat 31. The portion is bent upward to form a rib 33.

In the case of the above construction, the opposing inner edges of the mounting seats 31 forming the pair of legs 30 are rigid because the width of the support column 32a extending from the edges is the same as the width of the mounting seat 31. And the outer edge of the mounting seat 31 is also bent upward to form the rib 33, so that the rigidity is increased. Therefore, when the electric motor is driven, the frame 1
Even if the horizontal vibration generated in the horizontal direction is transmitted to the leg portion 30 and the support column 32b is bent and deformed in the left-right direction, the mounting seat 31 is deformed so as to be lifted upward between the two bolts 25 (central portion). Therefore, the vibration amplitude of the frame 1 becomes small.

FIG. 5 shows a fourth embodiment of the present invention.
The difference from the third embodiment is that, in addition to the ribs 33 formed on the edges of the installation seat 31 on both sides in the width direction of the narrow column 32b, both edges of the installation seat 31 that are apart from each other in the axial direction of the frame 1 are present. Is also bent upward to form the rib 34. That is, the mounting seat 31 has ribs 33, 34 formed on all peripheral portions thereof except the portions where the columns 32a, 32b extend from the mounting seat 31, in other words, from the peripheral portion of the mounting seat 31. Means that either the columns 32a, 32b or the ribs 33, 34 are extended,
The rigidity of the mounting seat 31 against vertical deformation is increased in any part. In this case, the ribs 33 and 34 are not separated from each other and are in a continuous state by drawing, welding, etc., so that the rigidity is further enhanced.

Therefore, even if vibrations are transmitted from the frame 1 to the legs 30 and the columns 32a and 32b are bent and deformed in the left-right direction, the mounting seat remains flat without bending upward, and the columns 32b having a narrow width are provided. Rib 3 due to bending deformation in the left-right direction
Even if a bending force in the left-right direction is applied to the ribs 3, the ribs 33 and the ribs 3
Since ribs 4 and 4 are continuous, the rib 33 is hardly bent and deformed in the left-right direction. As a result, the columns 32a,
The horizontal amplitude of 32b is reduced, and the horizontal vibration width of the frame 1 is also reduced.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following expansions are possible. In the mounting seats 22 and 31, all the edges may be bent upward to form ribs, and in the support column 29, the edges of the support columns 23a, 23b, 29a, 29b on both sides may be bent to form the ribs. . In this case, the mounting seats 22, 3
In No. 1, the rigidity against bending deformation in the upward direction is increased in any part, and in the columns 23 and 29, the rigidity against bending deformation in the lateral direction is further increased. Therefore, the amplitude of the frame 1 in the left-right direction is further reduced, so that it is possible to reduce the vibration of the electric motor main body and hence the noise.

[0030]

As described above, according to the rotary electric machine of the present invention, the following effects can be obtained. According to the rotating electric machine of claim 1, the two edges of the installation seat, which are fixed to the installation portion by the tightening member, and are apart from each other in the axial direction, are bent upward to form ribs. Since the rigidity against the vertical deformation of the part is increased, even if the vibration transmitted to the legs when driving the rotating electric machine bends and deforms the column on the outer side in the circumferential direction, the mounting seat cannot be lifted up due to this deformation, so the column The amplitude in the left-right direction becomes smaller. As a result, the amplitude of the frame in the left-right direction is also reduced, so that it is possible to reduce the vibration of the rotating electric machine body and thus the noise.

According to the rotating electric machine of the second aspect, since both edges of at least one of the pair of columns are bent to form ribs, the rigidity of this portion is enhanced, so that the legs are provided. The vibrations transmitted to suppress the lateral bending deformation of the support column. Therefore, the horizontal amplitude of the support column is reduced, and as a result, the horizontal amplitude of the frame is also reduced, so that vibration of the rotating electric machine main body can be reduced and noise can be reduced.

According to the rotating electric machine of the third aspect, when the width of at least one of the pair of columns forming the leg is formed to be narrower than the width of the installation seat, the width of the column having the narrow width. By forming the ribs by bending the edge portions of the installation seats existing on both sides in the upward direction, the rigidity of the installation seat against axial deformation is increased. Therefore, even if the vibration transmitted to the legs bends and deforms the column in the left-right direction, the center part of the mounting seat does not lift upward, and the amplitude of the column in the left-right direction is reduced, and as a result, the left and right sides of the frame are reduced. Since the amplitude in the direction is also reduced, it is possible to reduce the vibration of the rotating electric machine body and thus the noise.

According to the rotating electric machine of the fourth aspect, when the width of at least one of the pair of columns forming the leg is formed to be narrower than the width of the mounting seat, the width of the mounting seat is narrow. The side edges on both sides in the axial direction of the strut are bent upward to form ribs, and both edges that are apart in the axial direction of the frame are also bent upward to form ribs. The rigidity with respect to the flexural deformation in the upward direction is enhanced in both parts. Therefore, even if the vibration transmitted to the legs causes the support column to bend and deform, the deformation of the installation seat due to this deformation can be suppressed as much as possible, so that it is possible to further reduce the vibration of the rotating electric machine body and further reduce the noise. .

[Brief description of drawings]

FIG. 1 is an overall semi-longitudinal side view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a leg portion.

FIG. 3 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 2 showing a third embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 2 showing a fourth embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1 showing a conventional example of the present invention.

FIG. 7 is a vertical sectional front view of the whole.

FIG. 8 is a view corresponding to FIG.

[Explanation of symbols]

1 is a frame, 8, 21 and 27 are leg portions, 9 and 25 are tightening members (bolts), 10, 22 and 31 are mounting seats, 11a,
11b, 23a, 23b, 28a, 28b, 32a, 3
2b is a support, and 26, 29, 33, and 34 are ribs.

Claims (4)

[Claims] 1. A metal frame, a mounting seat fixed to a mounting portion by a fastening member, and a pair of extending from both ends of the mounting seat, the upper ends of which are fixed to the frame so as to be separated from each other in the circumferential direction. A pair of metal legs composed of columns, wherein both edge portions of the installation seat that are apart from each other in the axial direction of the frame are bent upward to form ribs. Rotating electric machine. 2. A metal frame, a mounting seat fixed to a mounting portion by a fastening member, and a pair of extending from both ends of the mounting seat, the upper ends of which are fixed to the frame so as to be separated from each other in the circumferential direction. A pair of metal legs composed of columns, wherein both edges of at least one column of the pair of columns are bent to form ribs. The rotating electric machine described. 3. A metal frame, a mounting seat fixed to a mounting portion by a fastening member, and a pair of extending from both ends of the mounting seat, the upper ends of which are fixed to the frame in a circumferentially spaced manner. A pair of metal legs composed of columns, wherein at least one column of the pair of columns is formed narrower than the width of the installation seat, and exists on both sides in the width direction of the narrow column. An electric rotating machine, wherein an edge of the installation seat is bent upward to form a rib. 4. The rotating electric machine according to claim 3, wherein, in addition to the edge portions on both sides in the width direction of the narrow column of the installation seat, both edge portions existing apart from each other in the axial direction of the frame are also bent upward. A rotating electric machine having ribs.