JPH0638431A - Frame for electric rotating machine - Google Patents

Abstract

(57) [Summary] [Structure] The mechanical rigidity against radial load due to belt load is improved by the mounting angle of the leg seat and the two support posts, and in which direction the load is applied to the shaft end of the rotating electric machine. An object is to provide a rotating electric machine that is equalized and has a large mechanical rigidity. [Effect] Since the mechanical rigidity becomes large, the rigidity becomes uniform overall in any radial direction, and the mechanical rigidity becomes large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg structure of a steel plate frame of a rotary electric machine.

[0002]

2. Description of the Related Art FIG. 6 is a side view of a general rotary electric machine, a part of which is shown in cross section, FIG. 7 is a front view thereof, and FIG. 8 is a structural view of legs. In the figure, 1 is a stator, 2 is a frame on which the stator 1 is mounted on the inner circumference, 3 is its body portion, 4 is leg portions attached below the body portion 3, and the body portion 3 and the leg portion 4 are All are made of steel plate. Reference numeral 5 denotes a rotor, and 6 denotes a rotary shaft on which the rotor 5 is mounted, which is supported by the bracket 7 via bearings. Numerals 8 and 9 are seats and columns that form the legs 4, and the column 9 is composed of an outer column 9a and an inner column 9b. The seat 8, the outer strut 9a, and the inner strut 9b are fixed to the body 3 by welding at an angle θ. Further, reference numeral 11 is a mounting bolt having a hole formed in the seat 8 for mounting to a mating machine.

The conventional rotary electric machine as described above is formed by welding one end of the outer strut 9a and the inner strut 9b constituting the leg 4 made of thick steel plate to the cylindrical body 3 made of thin steel plate. Was there. (For example, Japanese Patent Publication 64-704040, Japanese Patent Publication 64
-81638)

[0004]

In the above configuration,
A rotating electric machine is required to have mechanical rigidity against a radial load due to a belt load during load operation. When a load is applied to the shaft end of the rotary electric machine, the maximum stress is generated in the seat 8 of the leg 4, the outer strut 9a, and the inner strut 9 as shown in FIG.
A joint portion A with b, and a portion B which is a welded portion 10 of the body portion 3, the outer column 9a, and the inner column 9b.

The seat 8 of the leg 4 of the motor with respect to the load direction
The maximum stress and the maximum displacement of are maximum when vertical load (A, E) is applied to the shaft end as shown in FIG. Experimental data has been obtained that the next is the diagonal direction (B, D), and the minimum is when a load in the horizontal direction (C) is applied to the shaft end. As described above, there is a problem that the mechanical rigidity is significantly inferior to the load in the vertical direction.

With respect to the load in the vertical direction, the outer support column 9a and the inner support column 9b constituting the leg section 4 are seated on the seat 8 and the body section 3.
Since they are joined by the welded portion 10 at a certain angle, the inner strut 9b receives most of the tensile, compression, and bending moments against the vertical load, as shown in FIG. Moment load works.

For a horizontal (C) load, FIG.
As shown in FIG. 1, the outer strut 9a receives most of the load, and while supporting the load, it receives tensile, compression, and bending moments.

From the side view, it was found from an experiment that the deformation of the frame 2 was small and only the deformation of the legs was observed, as shown in FIG. For upward and downward loads, the J and M parts receive maximum compressive stress, and K and L
It was obtained from the experiment that was subjected to the maximum tensile stress.

Further, when a load is applied to the shaft end of the rotating electric machine, the maximum stress is generated in a portion 3 around the welded portion 10 of the body 3 and the outer column 9a and the inner column 9b as shown in FIG.
1 and the seat 8 of the leg 4 and the corner portion 32 of the outer strut 9a and the inner strut 9b.

As described above, the allowable stress and the deformation are remarkably large with respect to the load during the load operation, and the mechanical rigidity is inferior, so that there is a problem that the peripheral portion 31 and the corner portion 32 are cracked or plastically deformed.

This is because the stress due to bending exceeds the allowable stress when a load is applied to the thin steel plate of the frame when a load is applied. Further, at the corners of the seat and the column, stress or stress concentration occurs, so that cracks or plastic deformation occur.

The present invention has been made in view of the above circumstances, and an object thereof is to improve mechanical rigidity against a radial load due to a belt load by a mounting angle between a seat of a leg portion and two support posts, and a rotating electric machine. An object of the present invention is to provide a rotating electric machine having a large mechanical rigidity that is equalized when a load is applied to the shaft end in any direction.

[0013]

According to a first aspect of the present invention, there is provided a frame for a rotary electric machine, wherein the left and right sides of the outer circumference of a cylindrical frame body made of a steel plate are provided with legs made of a steel plate seat and two columns. In the frame of the rotating electric machine fixed by welding, the inner struts of the struts are arranged at an angle of 90 degrees with the seats, and the outer struts are 45
It is characterized in that it has leg portions arranged at an angle of degrees.

The frame of the rotating electric machine according to claims 2 to 4 comprises:
A structure in which the outer circumference of the frame body is supported by two columns on each of the left and right side faces, and the dimensions of the portion welded in the column width direction with respect to the stack thickness dimension of the stator core mounted inside the frame. Have the same size or are short (claim 2). And column width 1 at the corner where the column and seat are joined
The R portion is provided with a dimension of / 6 or more (claim 3). Further, the frame body is formed in a trapezoidal shape so that the joint between one seat and the seat inside each two pillars on the left and right ends up to the end of the seat (claim 4).

[0015]

According to the first aspect of the present invention, the mechanical rigidity against the radial load due to the belt load during load operation is such that when a load is applied to the shaft end of the rotating electric machine, a vertical (A, E) load is applied to the shaft end. Is the maximum, and the leg seat and inner strut are located at 90 degrees with respect to the vertical load, and the leg seat and outer strut are located at 45 degrees with respect to the horizontal load. This increases the mechanical rigidity. For this reason, the rigidity is uniform and mechanical rigidity is increased in all of the radial directions.

In the second to fourth aspects, the mechanical rigidity against the radial load due to the belt load during load operation is within the product thickness dimension of the stator core having large mechanical rigidity when a load is applied to the shaft end of the rotating electric machine. By welding the pillars of the legs to the thin steel plate portion having low rigidity, no load is received, so that the supporting rigidity of the rotating electric machine can be increased (claim 2). Further, stress concentration is relieved by providing an R portion which is ⅙ or more of the width of the support plate at the corner of the seat and the support (claim 3). Further, by making the leg shape trapezoidal, the second moment of area of rigidity against bending is increased, and the mechanical rigidity around the supporting circumference is improved (claim 4).

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The description of the components having the same reference numerals as those of the conventional rotary electric machine configuration will be omitted.

Reference numeral 3 denotes a body portion, 4 denotes a leg portion mounted below the body portion 3, and both the body portion 3 and the leg portion 4 are made of a steel plate. Numerals 8 and 9 are seats and columns that form the legs 4, and the column 9 is composed of an outer column 9a and an inner column 9b. The seat 8 and the outer column 9a are joined to the body 3 by a welded portion 10 at an angle of 45 degrees. Also, the seat 8 and the inner support column 9b
Is joined to the body 3 by the welded portion 10 at an angle of 90 degrees.

According to the above embodiment, the following effects can be obtained.
That is, since the seat 8 and the inner support column 9b are attached at an angle of 90 degrees, when a vertical load (A, E) is applied as shown in FIG. 3, a bending load and a moment load are applied to the inner support column 9b. It does not work and no bending and moment stress is generated in the leg 4. Most of the load is received by the inner column 9b, and the stress is due to a simple tensile and compressive load, so that the mechanical rigidity becomes large.

Further, since the seat 8 and the outer support column 9a are arranged at an angle of 45 degrees, the support column 9a is supported by the support column 9a 'directly from the side when a load is applied in the horizontal direction (C) as shown in FIG. Is the best. However, in view of the actual mounting size of the structure, the angle of 45 degrees results in the shortest length l of the outer strut 9a due to the load vector distribution, and the mechanical rigidity becomes large. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. The description of the same reference numerals as those of the conventional rotary electric machine structure will be omitted.

Reference numeral 3 denotes a body portion, 4 denotes a leg portion mounted below the body portion 3, and both the body portion 3 and the leg portion 4 are made of steel plates. Reference numerals 58 and 59 denote seats and columns that form the leg portion 54, and the column 58 includes an outer column 58a and an inner column 58b. The thickness L of the stator core 1 mounted inside the body 3 and the width L of the inner support column 59b and the dimension L including the weld overlay are the same or shortened and joined by welding.

According to the above embodiment, the following effects can be obtained. That is, since the product thickness L of the stator core 1 mounted inside the body 3 and the width of the inner support column 59b and the weld overlay L are the same or short, they are joined by welding.
As shown in FIG. 19, it was found from the measurement data of the relationship between the length of the laminated thickness dimension L and the stress that the stress became extremely small at the point e. This is because when the load is applied to the shaft end of the rotary electric machine, the frame 52 does not receive the load at the portion of the thin steel plate having a low rigidity, so that concentrated stress does not occur.
That is, since the load at the point e is received by the stator core 1 having high rigidity, the stress becomes small. (Third embodiment)

As shown in FIG. 15 and FIG.
The corner 71 where the seat 58 and the seat 58 are joined has an R portion.
As shown in FIG. 20, this is due to the relationship between the R dimension and the stress with respect to the column thickness t of the support column 59, and from the relationship between the R width of 1/6 or more of the column width of the support column 9.
The size reduces the stress. That is, the stress concentration is relieved and the stress does not become large. As shown in FIGS. 17 and 18, two inner struts 59 b and two seats 58 are joined to the left and right sides of the body portion 3 to form a trapezoidal shape up to the end of the seat 58.

This increases the geometrical moment of inertia with respect to bending of the inner support column 59b and improves the mechanical rigidity.
However, regarding the outer support column 59a, the outer support column 59a and the seat 58
If the joining portion of is a trapezoidal shape up to the end of the seat 58, the mounting bolt 51 cannot be mounted, and therefore only the inner support column 59b is used.

The effect of the third embodiment is that the outer circumference of the frame is supported by two columns on each of the left and right side surfaces, and with respect to the stack thickness of the stator core mounted inside the frame,
The above-mentioned welded portion in the width direction of the support column has the same size or is shortened, and the corner portion where the support column and the seat are joined has an R portion which is 1/6 or more of the support plate width. Furthermore, the frame body has a trapezoidal shape in which two seats are joined to the seats on the left and right, so that there is no part added to the thin plate against the radial load due to the belt load. Since there is no part where concentrated stress is applied, mechanical rigidity is increased.

[0026]

As described above, in the rotating electric machine of the present invention, one end of the seat forming the leg portion and the inner strut are at an angle of 90 degrees, and the other end of the seat and the outer strut are at an angle of 45 degrees. By fixing each, the mechanical rigidity of the legs was improved. As a result, it is possible to increase the mechanical rigidity for equalizing the axial end of the rotary electric machine regardless of the direction of the load applied. Further, since the mechanical rigidity is high, the eccentricity between the stator and the rotor under load is reduced, and vibration and noise are reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention,

FIG. 2 is a structural diagram of the legs,

FIG. 3 is an explanatory view of load,

FIG. 4 is an explanatory view of load,

FIG. 5 is an explanatory diagram for the direction of load,

FIG. 6 is a side view of a conventional example,

FIG. 7 is a view corresponding to FIG. 1 of a conventional example,

FIG. 8 is a view corresponding to FIG. 2 of a conventional example,

FIG. 9 is a view corresponding to FIG. 4 of a conventional example,

FIG. 10 is a view corresponding to FIG. 5 of a conventional example,

FIG. 11 is a leg structure diagram of a conventional example,

FIG. 12 is an explanatory diagram of stress in a conventional example,

FIG. 13 is a side view including a partial cross-section showing a second embodiment of the present invention,

FIG. 14 is a structural diagram of the legs,

FIG. 15 is a view corresponding to FIG. 13 of the third embodiment.

16 is a view corresponding to FIG. 14 of the third embodiment,

FIG. 17 is a view corresponding to FIG. 13 of the fourth embodiment,

FIG. 18 is a view corresponding to FIG. 14 of the fourth embodiment,

FIG. 19 is an explanatory diagram of stress with respect to the column width,

FIG. 20 is an explanatory view of the relationship between the R dimension and the stress with respect to the strut width,

FIG. 21 is an explanatory diagram of a conventional stress example.

[Explanation of symbols]

2, 52 are frames, 3 are trunks, 4, 54 are legs,
8 and 58 are seats, 9 and 59 are columns, 9a and 59a are outer columns, 9b and 59b are inner columns, and 10 is welding.

Claims (4)

[Claims] 1. A frame of a rotary electric machine in which the left and right side surfaces of the outer periphery of a cylindrical frame body made of steel plate are made of steel plate, and a seat and legs of two columns are fixed by welding. In the frame, the inner column is the seat. At 90 degrees to one end of the
A frame of a rotary electric machine, characterized in that the legs are formed by welding and fixing each at an angle of 5 degrees. 2. A stator core is mounted inside, and a cylindrical steel plate frame is provided on the left and right sides of the outer periphery of the frame body with a steel plate and a seat.
In a frame of a rotary electric machine in which legs made of book columns are fixed by welding, the size of the portion welded in the column width direction is the same as or shorter than the product thickness of the stator core. flame. 3. The frame of a rotary electric machine according to claim 2, wherein a corner portion where the support pillar and the seat are joined has an R portion having a dimension of ⅙ or more of the width of the support pillar. 4. The frame of a rotating electric machine according to claim 2, wherein the outer pillar and the seat are joined in a trapezoidal shape by two pillars respectively provided on the left and right side surfaces of the outer periphery of the frame body.