JPS58172951A - Motor - Google Patents

Abstract

PURPOSE:To delete the number of parts by rotating a stator core formed with grooves of different sizes on the outer periphery prescribed times to stack them and engaging the connecting piece of an end bracket to the stepped part of the groove formed on the outer periphery of a stator. CONSTITUTION:Grooves 11a1, 11a3, 11a5 of width (a) and depth (b) are formed on the outer periphery of a stator core 11, and grooves 11a4, 11a6, 11a3 of width A (>a) and depth B (>b) are formed at the position rotating at 180 deg. to the grooves 11a1, 11a3, 11a5. Stator cores 11 of such shape are stacked in number corresponding to the stacking thickness (l), for example, in such a manner that they are stacked twice per at 180 deg. at two positions of thicknesses (l/4) and (3l/ 4), grooves 13 of different width and depth are formed on the outer periphery of a stator 12, and connecting pieces formed at the first and second end brackets are bent and connected to the stepped parts 13a of the grooves 13 formed at the inverted position.

Description

[Detailed description of the invention] The present invention relates to a small-sized conductive 17Ib machine.

FIG. 1 shows a conventionally known electric motor, in which a housing 1 is fixed to the outer periphery of a stator 5 formed by a stator core 6, and first end brackets 2, @2 are attached to both ends of this nozzle l. This is a structure in which the end bracket 3 is fixed with bolts 4. In this structure, if the parallelism of both end faces of the housing 1 is maintained, the end bracket 2 and the second end bracket 3 of the w41 are fixed in parallel, and the first bearing 8. There is no possibility that an excessive force is applied to the second bearing 9 or that abnormal noise is generated due to an assembly error. On the other hand, for the purpose of structural simplification, in the case of a structure in which the stator 5 as shown in Fig. 2 is directly inserted between the end bracket 2 of s1 and the end bracket 3 of
5b are not kept parallel, the first end bracket 2. The second end bracket 3 is not fixed in parallel,
As a result, the first bearing 8. An unreasonable force is applied to the second bearing 9, causing an abnormal noise) or the second bearing 9 may not rotate. In addition, both ends 5m of the stator 5 are here.

The parallelism of 5b is generally unfavorable with normal stator manufacturing methods and requires a special manufacturing method.

Normally, the stator 5 of a small induction motor is made by stacking several tens to hundreds of thin plate-shaped stator cores 6f of about 0.5 mm, and each stator core 6 has a difference in thickness between the left and right sides. Although there are only a few, if dozens to hundreds of these overlap in the same direction, both end faces 5a of the stator 5,
The parallelism of 5b is also the result of the error for each sheet, and becomes such a value that it cannot be used in an electric Illb machine having the structure as shown in FIG.

As a countermeasure against this, the stator cores 6 forming the stator 5 are generally symmetrical at 180 degrees, and when stacking the stator cores 6, they are simply stacked in the same direction, so that the stator cores 6 are stacked in the same direction. Instead, so-called inverted stacking is performed, in which the stators are twisted 180 degrees and stacked at the center of the stator stack thickness. Conventionally, after this reverse stacking is performed as shown in FIG. 2, the stator 5 is clamped and fixed between the eleventh and second end brackets 2 and 3 with bolts 4.

However, since this structure uses bolts 4, the number of parts increases, and the workability and productivity of rounding and assembly, which requires the laborious process of tightening screws, is disadvantageous.

The object of the present invention was made in view of the above-mentioned drawbacks, and aims to reduce the number of parts and improve productivity in a structure in which end brackets are directly abutted against both end faces of the stator and the stator is sandwiched between the end brackets. To provide electric motors such as:

The main point of the present invention is that, as shown in Fig. 2, in the case of an electric motor having a structure in which the stator is directly sandwiched between end brackets, it is necessary to stack the stator core upside down in order to improve assembly accuracy. By taking advantage of the opportunity to provide grooves on the outer periphery of the stator core as shown in FIG. 3, the outer periphery of the stator as shown in FIG.

The difference is that a stepped groove as shown in FIG. 5 is formed and the stepped groove is used for fixing the end bracket.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIGS. 6 and 7 are a sectional view and an enlarged perspective view of essential parts, respectively, showing an embodiment of the electric motor according to the present invention. Stator core 11
As shown in FIG. 3, a round groove 11a (
llal to IIJIs), the shape is symmetrical to rotation by 180°. Here, the groove 111 is formed so that the first groove 11a has a width of x depth b, and the fourth groove #11114 located at a position 180° rotationally symmetrical with this groove has a width of ax and a depth of B. It is formed so that people) a, B) b
It is designed to meet the following conditions. In addition, the fifth groove 1
1- and a second groove 1 located at a position that is 180° rotated with this one.
1 m, third groove 111. The sixth groove 1 m, which is located at a position that is 180 degrees rotational, is also connected to the first groove 1.
It is provided in the same way as the relationship between #10 and #11114 of #1E4. Stator cores 11 having such a shape are piled up in a number corresponding to the stacking thickness t (several tens to hundreds of pieces), and in the case of this embodiment, the stator cores 11 are rolled and stacked as shown in FIG. A stator 12 is formed. Therefore, the stator 12 has grooves 13 of different widths and depths on its outer circumference.
will be formed, and a step 1i1 will be formed at the place where the inversion is performed.
s13a will be formed.

On the other hand, the first. The second end bracket 14°15 has
As shown in detail in FIG. 7, it is formed so that it can be placed on the #i13, and nine locking pieces 14 m and 15 m (14 shoes are not shown in FIG. 7) are integrally provided, and a cough lock is provided. After fitting the pieces 14m and 15atlltf into the grooves 13 and positioning them, the locking portions 14b and 15b are bent and locked to the step portion 13m, whereby the first. The second end bracket) 14,15 is fixed to the stator 12.

In this way, this embodiment eliminates the need for the soft bolt 4 in the conventional structure shown in FIG. 2, and also eliminates the need for tightening the bolt 4. Improved productivity can be achieved.

In addition, in the above-mentioned nine embodiments, the stator core 11 is not limited to this, and for example, the stator core 11 is
The stator 12 may be formed by inverting and stacking them. Further, in the embodiment described above, the first groove 11m and the third #11ias.

the fifth groove 11al, and the second groove 111. ．． Fourth groove 1
1 m, 6th groove 111. Although these are provided with different widths and depths, the invention is not limited to this, and it is sufficient that at least one of the widths and depths is different. Furthermore, if there is no difference in thickness between the left and right sides of each stator core, or if there is no practical problem even if there is a difference, the stator cores may be stacked by inverting them 1,000 times as in the example described above. For example, rotate 60 degrees and stack L6.
good. -'')'' Figures 8 and 9 show the locking piece 14a (15m).
A modified example is shown. That is, in the embodiment described above, after the locking piece 14a (15a) is once positioned at #$13, the locking portion 14b (15b) is bent, but the locking piece 14' in FIG. a (15'a) is made of an elastic steel plate or the like, and the locking part 14'b is
(15'b) is configured to be hooked on the step 51311 of the groove 13, and the locking piece 14''a (
15" 1) is made of synthetic resin material, and the locking part 1
4"b (15vb) and attach the locking piece 14.
Using the elasticity of #a (15'a), the locking part 14''
b (15"b) is hooked on the stepped portion 13m of the groove 13. With this structure, the number of assembly steps can be further reduced and productivity can be improved. can get.

As explained above, according to the present invention, both 11 of the stator
In an electric motor having a structure in which two end plates are brought into direct contact with the 11th surface and the stator is sandwiched between the end brackets, a plurality of stators having different widths, widths, and depths are used.
A stepped groove is formed on the outer periphery of the stator core, and by rotating the stator cores by a predetermined amount and stacking them, a groove with a step is formed on the outer periphery of the stator, and a locking piece formed on the end bracket is engaged with the stepped portion of the stator core. Since the bracket is configured to be fixed to the stator, it is possible to eliminate the need for bolts compared to the conventional method, and also eliminates the need to tighten the bolts, thereby reducing the number of parts and improving productivity. It has this excellent effect.

[Brief explanation of the drawing]

Figures 1 and 2 are sectional views of a conventional electric motor, respectively;
FIG. 3 is a front view showing one embodiment of the stator core of the present invention, FIGS. 4 and 5 are perspective views showing respective embodiments of the stator core of the present invention, and FIG. 6 and FIG. A Wr side view and an enlarged perspective view of essential parts showing an example of such an electric motor,
FIGS. 8 and 9 are perspective views showing each embodiment of the locking piece. 11... Stator core, 11a (1111~i
1aa) Groove, 12 Stator, 13 Groove, 13 To step, 14 First bracket, 1
5...Second bracket, 14al14'al14"
a, l 5 a Its'a115#...locking piece 1 Figure 2 Mj figure hIfI! ; Figure 17

Claims (1)

[Claims] L: Protruding end brackets directly on both ends of the stator,
By installing the stator in an electric motor having a structure in which the stator is sandwiched between end brackets, forming a plurality of grooves having different widths and depths on the outer periphery of the stator core, and stacking the stator by rotating the stator by a predetermined amount. An electric motor characterized in that a stepped groove is formed on the outer periphery of the stator, and a locking piece formed on the end bracket is engaged with the stepped portion of the groove to fix the end bracket to the stator. 2. The electric motor according to claim 1, wherein the stator cores are stacked upside down to form stepped grooves on the outer periphery of the stator. & The electric motor according to claim 1, wherein the locking piece is formed of an elastically deformable member.