JP2714008B2 - Laminated core - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming a laminated core, and more particularly to a method for forming a laminated core suitable for forming, for example, a stator core of a single-phase induction motor. is there.

[Conventional technology]

In a conventional laminated core, for example, as described in JP-B-51-28401, a plurality of clamp portions for laminating and fixing the laminated cores are provided at an outer peripheral end portion of the stator core.

Another conventional laminated core is disclosed in, for example, Japanese Utility Model Laid-Open No. 55-1598.
As described in Japanese Patent Publication No. 2, a plurality of separate clamp pins for laminating and fixing the entire laminated core are used.

[Problems to be solved by the invention]

The above prior art will be described with reference to FIGS. 4 to 7. FIG.

FIG. 4 is a plan view of a conventional stator core disclosed in Japanese Patent Publication No. 51-28401, and FIG.
FIG. 6 is a plan view of another conventional stator core described in Japanese Utility Model Laid-Open No. 55-15982, and FIG. 7 is a plan view of another conventional stator core.

First, in FIGS. 4 and 5, reference numeral 21 denotes a stator core, 22 denotes a laminated core, 23 denotes a slot, 24 denotes a clamp portion, 27 denotes a core effective back portion, 28 denotes a gap generated between the laminated cores, 29 denotes a clamp portion 24
Of the projection. This stator core 21 is
Is inserted into the recess formed on the back of the projection 29 of the other laminated core 22 and is laminated and fixed. However, since the gap 28 is formed between the laminated cores 22, the strength is reduced. was there.

Further, when this clamp type is fixed to a frame or the like with a bolt hole provided with a bolt, there is a problem that the stator core is deformed.

 Next, another conventional technique shown in FIG. 6 will be described.

In FIG. 6, 31 is a stator core, 33 is a slot,
34 is a clamp pin, and 37 is a core effective back.

This stator core 31 has a problem that the number of parts increases because a plurality of clamp pins 34 as separate members are used to penetrate and fix the laminated core in order to laminate and fix the cores. .

After punching the laminated core,
Since 34 caulking processes are added, there are problems such as a large number of production processes, an increase in equipment costs, and a long production tact.

 Still another conventional technique will be described with reference to FIG.

In FIG. 7, 41 is a stator core, 44 is a projection for welding, 46 is a bolt hole, and 47 is an effective back of the stator core. The stator core 41 is a method of joining and fixing the welding projections 44 by TiG welding or plasma welding as a part system of the laminated core, and there is a problem that the stator core is deformed by heat.

Further, since a welding step is further added after punching the laminated core, there are disadvantages such as a longer production step, a longer production tact, and a higher equipment cost. Further, there is a problem that a welding place is limited to an outer peripheral portion.

The present invention has been made in order to solve the above-mentioned problems of the related art, and has an object to provide a laminated core having high productivity without increasing the strength of a stator core and without deteriorating characteristics. It is.

[Means for solving the problem]

The object is to form a stator core by laminating a plurality of cores and fixing them with bolts, and a plurality of bolt holes provided in the stator core, and a first plurality provided in the vicinity of the bolt holes. And a plurality of second clamps formed between the bolt holes and at a position farther from the bolt holes than the first clamp, wherein the second clamps are disposed in the longitudinal direction. Is formed along the direction of the magnetic flux.

[Action]

In the laminated core of the stator core of the present invention, the strength of the stator core is increased by forming a clamp portion for lamination fixation, particularly for improving strength, at an intermediate position between the bolt holes of the plurality of bolt holes.

In addition, by forming the longitudinal direction of the clamp portion and the direction of the main magnetic flux in the same direction, for example, as a stator core of a single-phase induction motor, a highly productive laminated core that does not impair heavy magnetic characteristics. It is possible to obtain a forming method.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a plan view of a stator core according to one embodiment of the present invention, FIG. 2 is a detailed sectional view showing a state of forming a clamp portion on an outer peripheral portion of the stator core of FIG. 1, and FIG. It is a detailed sectional view showing the formation state of the clamp part for intensity improvement of the stator core of the figure.

In FIG. 1, reference numeral 1 denotes a stator core. The stator core 1 is formed by laminating a plurality of laminated cores 2, 2 '(see FIGS. 2 and 3), and is finally fixed by bolts through bolt holes 11. , Which are the main elements constituting the electric motor section.
The laminated core is generally formed by stamping a steel plate.

3 is a slot formed by punching, 12 is a tooth portion, 4 is a clamp portion for lamination fixing provided on the outer peripheral portion of the stator core 1, and 5 and 6 are for lamination fixing and, in particular, for improving strength. It is a clamp part provided as. Details of the state of formation of these clamp portions are shown in FIGS.

The clamp portions 5 and 6 for improving the strength are located at an intermediate position between the plurality of (four in FIG. 1) bolt holes 11, that is, at a position substantially overlapping the center line between the bolt holes 11. Further, it is formed at a position facing the teeth portion 12, and is formed so that the longitudinal direction of the clamp portion and the direction of the main magnetic flux are in the same direction.
The direction of the arrow shown in FIG. 1 indicates the direction of the main magnetic flux, for example, the direction of the main magnetic flux generated by a main coil (not shown) in a single-phase induction motor. The flow of the magnetic flux between the stator core 1 and the rotor (not shown) is performed via the teeth 12 of the stator core 1.

In FIG. 1, reference numerals 7 and 8 denote effective back portions of cores which serve as magnetic flux passages.

Next, the details of the clamp formation will be described with reference to FIGS. 2 and 3. FIG.

 FIG. 2 shows a cross-sectional view of the clamp portion 4 on the outer peripheral portion.

In FIG. 2, 2 is the outermost laminated core of the plurality of cores, 2 'is a laminated core other than the laminated core 2 of the plurality of cores, and 9 is a clamp formed on the laminated core 2. The protruding portion 10 is a relief hole formed in the laminated core 2 '. That is, a plurality of relief holes 10 are provided so that the protrusion 9 of the laminated core 2 does not protrude from the lower end of the laminated core 2 'at the lowermost end of the stator core. This is because, as shown in FIG.
This is to prevent the protrusion 9 of the clamp from coming into contact with a frame (not shown) for fixing the stator core 1, for example, because it is in the vicinity of 11.

FIG. 3 is a cross-sectional view of the clamp portions 5 and 6 for improving strength.

In the clamp portions 5 and 6 shown in FIG. 3, the number of the laminated cores 2 'in which the relief holes 10 of the protrusions 9 of the clamp portion are formed is reduced by one compared with the case of the clamp portion 4 in FIG.
Is protruded from the surface beyond the thickness of the laminated core 2 ′ to increase the strength of the stator core 1.

Further, the size of the effective back portions 7 and 8 of the stator core 1 is large,
Due to the small size, it is easy to form the clamp portions 5 and 6 in proportion to each other, and the strength can be improved by enlarging the clamp shape within a range that does not hinder the flow of the magnetic flux.

As described above, as means for improving the strength of the stator core 1, in addition to the clamp portions 4 on the outer peripheral portion, the clamp portions 5 are provided at intermediate positions between the plurality of (four in FIG. 1) bolt holes 11 respectively. And 6, the strength inside the stator core 1 can be improved. In addition, the clamp portions 5, 6 are located at the opposite portions of the teeth portion 12, which are likely to coincide with the direction of the main magnetic flux, and the longitudinal directions of the clamp portions 5, 6 are arranged so as to be the same as the direction in which the main magnetic flux flows. In addition, it is possible to improve the lamination fixing strength of the core and to reduce the magnetic vibration of the stator core 1 without disturbing the flow of the magnetic flux. Improving the strength inside the stator core 1 is achieved by preventing deformation of the laminated core 2 forming the stator core 1 by an insertion pressure generated when a large number of coils (not shown) are inserted into the slots 3 and There is an effect that floating of the laminated cores 2, 2 'located at the upper and lower ends of the stator core 1 can be eliminated.

After the motor is assembled, the stator core 1
Since the bolt holes are screwed and fixed via the bolt holes 11, the bolt holes are firmly fixed, and the intermediate portions of the bolt holes are fixed by the clamp portions 5, 6, so that the entire bolt holes are fixed with good balance.

According to this embodiment, the productivity is high, and the strength of the stator core can be improved without lowering the most important magnetic characteristics of the single-phase induction motor. Further, by mounting a single-phase induction motor manufactured based on the method of forming a laminated core of the present embodiment in a hermetic electric compressor used in a refrigerator or the like, noise, vibration, and the like caused by the stator core are reduced. it can.

Further, it is possible to prevent the deformation of the core and the floating of the laminated core due to the coil insertion force generated during the winding work of the stator, which can contribute to the reduction of the production cost.

〔The invention's effect〕

As described above, according to the present invention, it is possible to increase the strength of the stator core, reduce the magnetic vibration of the stator core without disturbing the flow of the magnetic flux, and form a highly productive laminated core without impairing the characteristics. A method can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a stator core according to one embodiment of the present invention, FIG. 2 is a detailed sectional view showing a state of forming a clamp portion on an outer peripheral portion of the stator core of FIG. 1, and FIG. FIG. 4 is a detailed sectional view showing a state of forming a strength improving clamp portion of the stator core of FIG. 4, FIG. 4 is a plan view of a conventional stator core,
FIG. 5 is a detailed sectional view taken along the line AA of the clamp portion in FIG. 4, FIG. 6 is a plan view of another conventional stator core, and FIG.
It is a top view of another conventional stator core. 1 ... stator core, 2, 2 '... laminated core, 4 ... clamp part, 5, 6 ... clamp part, 7, 8 ... core effective back part, 9
… Protrusion, 10… Relief hole, 11… Bolt hole.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Shigeru Kawanami 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Inside the Tochigi Plant of Hitachi, Ltd. In the Tochigi Plant of Hitachi, Ltd. (56) References JP-A-58-99247 (JP, A) JP-A-48-20003 (JP, A) JP-A-52-137610 (JP, A)

Claims (3)

(57) [Claims] 1. A stator core formed by laminating a plurality of cores and fixing them with bolts, wherein a plurality of bolt holes provided in the stator core and a first bolt provided near these bolt holes are provided. And a plurality of second clamps formed between the bolt holes and at a position farther from the bolt holes than the first clamp, wherein the second clamps have a longitudinal direction. A laminated core formed so that the direction is along the direction of magnetic flux. 2. The laminated core according to claim 1, wherein said second clamp is provided in the vicinity of a tooth base between slots of said stator core. 3. A laminated core according to claim 1, wherein said stator core is used for a single-phase induction motor, and said second clamp is provided substantially in parallel in a longitudinal direction.