JP2918721B2 - Stator core - 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 core, and more particularly to a stator core suitable for forming a laminated core having high reliability and high productivity, for example, as a stator core of a single-phase induction motor. Things.

[0002]

2. Description of the Related Art A conventional stator core is disclosed, for example, in
As described in JP-A-28401, a clamp portion for laminating and fixing a plurality of flat cores each including a coil insertion slot, a tooth portion forming a magnetic circuit, and an effective core back portion is provided around the core. It was provided at a plurality of locations at the end.

[0003]

The above prior art will be described with reference to FIGS. Figure 5 shows the Japanese Patent Publication No. 51-2.
No. 8401, a plan view of a conventional stator, and FIG.
7 is an enlarged cross-sectional view taken along line AA of the clamp portion in FIG. 5, FIG. 7 is a plan view of another conventional stator core, and FIG. 8 is an enlarged cross-sectional view taken along line BB of the clamp portion in FIG. First, in FIGS. 5 and 6, reference numeral 21 denotes a stator core, that is, a stator core;
Is a core that is laminated to form a stator core, 23 is a slot, 24 is a clamp portion, 27 is a core effective back portion, 28 is a gap generated between the laminated cores, and 29 is a protrusion of the clamp portion 24.

[0004] The stator core 21 includes a clamp portion 24.
Is inserted into the recess formed on the back of the projection 29 of the other core 22 and is laminated and fixed. However, since a gap 28 is formed between the cores 22, there is a disadvantage that the strength is weakened. Was. Further, this clamp system has a problem that the stator core is deformed when a bolt hole is provided and fastened and fixed by a bolt.

Next, another conventional technique shown in FIG. 7 will be described. 7 and 8, reference numeral 31 denotes a stator core;
Is a slot, 34 is a clamp part, 37 is a core effective back,
Reference numeral 39 denotes a protrusion of the clamp unit 34. The stator core 31 is to laminate affixed to each core, but projections 39 of the clamp portion 34 is fixed is inserted into the recess occurring on the back of the protrusion 39 of the other laminated core 32 stacked, the projections 3
9 has a circular shape, so that punching oil, which is a lubricant for the press, enters the recesses and weakens the laminating pressure. Further, since the amount of the punching oil entering is irregular, the fastening force between the laminations is reduced. And there was a problem that the core was peeled off.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and prevents punching oil from entering a concave portion of a clamp portion, increases the strength of a stator core, and improves production without impairing characteristics. It is an object of the present invention to provide a stator core having a laminated core having high performance.

[0007]

In order to achieve the above object, a stator core according to the present invention comprises a plurality of slots for inserting coils, a plurality of teeth and a core effective back which form a magnetic circuit. In a stator core that forms a laminated core by laminating a plurality of cores via an uneven clamp portion provided on the outer peripheral portion of the core, a steel plate is formed in a circular recessed portion of the clamp portion. In which a relief hole for punching oil to be used at the time of punching is provided.

More specifically, the shape of the concave and convex portions of the clamp portion is formed in a semicircular shape, and the semicircular curved axis is radially arranged from the center of the inner diameter of the stator core. Further, a plurality of bolt holes for laminating the core and fixing them with bolts are provided on the outer peripheral portion of the core, and shifted to an intermediate position between the bolt holes from the XX axis and the YY axis on the core plane. The clamp part is positioned on the radiation at an angle.

[0009]

According to 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 fixing the laminated body, particularly for improving the strength, at an intermediate position between the bolt holes of the plurality of bolt holes. ing. In addition, the angle of the clamp unit with respect to the XX axis and the YY axis is θ.
Thus, a stator core with high productivity can be obtained without impairing important magnetic characteristics as a stator core of a single-phase induction motor, for example.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. [Embodiment 1] FIG. 1 is a plan view of a stator core according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a state of forming a clamp portion of the stator core of FIG. 1 and 2, reference numeral 1 denotes a stator core, that is, a stator core. The stator core 1 is formed by laminating a plurality of cores 2 and 2 ′, and is finally fixed by bolting via a bolt hole 11. . The cores 2 and 2 'are generally formed by stamping a steel plate.

Reference numeral 3 denotes a slot formed by punching for inserting a coil, 4 denotes a plurality of teeth forming a magnetic circuit, and 5 denotes a core effective back portion forming a magnetic circuit. Reference numeral 6 denotes a clamping portion provided on the outer peripheral portion of the stator core 1 for lamination fixing, and reference numerals 7 and 8 denote clamping portions provided for lamination fixing and particularly for improving strength. The plurality of clamp portions 7 and 8 for improving the strength (FIG. 1)
In this case, four bolt holes 11 are formed at intermediate positions between the bolt holes. The direction of the XX axis 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) during operation in a single-phase induction motor.

Next, details of the clamp formation will be described with reference to FIG. FIG. 2 shows a cross-sectional view of the clamp portion 6 on the outer peripheral portion. In FIG. 2, reference numeral 2 denotes the uppermost core of the plurality of cores, 2 ′ denotes a core other than the core 2 among the plurality of cores, 9 denotes a projection of a clamp formed on the core 2, 10 ′ Are relief holes formed in the core 2 '. That is, the escape hole 1 is formed so that the projection 9 of the core 2 does not protrude from the lower end of the core 2 'at the lowermost end of the stator core.
At least one 0 is provided. This is because the clamp 6 is located near the bolt hole 11 as shown in FIG. 1, so that the protrusion 9 of the clamp is prevented from contacting a fixing frame (not shown) of the stator core 1. is there.

As shown in FIG. 2, in the clamp portion, a relief hole 13 is formed in the projection 9 of the clamp portion, and a punching oil 1 is used as a lubricating oil for punching a core.
2 is allowed to escape in the recess. For this reason,
Since the pressing force of the press can be kept constant at all times, the fastening strength between the laminated cores becomes constant and the strength can be increased. In addition, it is easy to form the clamp portions 7 and 8 in proportion to the size of the effective back portion 5 of the stator core 1 in accordance with the size of the effective back portion 5, and the strength can be further improved.

[Embodiment 2] FIG. 3 is a plan view of a stator core according to another embodiment of the present invention, and FIG. 4 is an enlarged sectional view showing a state of forming a clamp portion of the stator core of FIG. In the figure, components having the same reference numerals as those in FIGS. 1 and 2 are the same as those in the previous embodiment, and the description thereof will be omitted. 1A is a stator core, that is, a stator core.
Is laminated with a plurality of cores 2A and 2A ', and is finally fixed by bolting via bolt holes 11. 6
A is a clamp portion for lamination fixation provided on the outer peripheral portion of the stator core 1A, and 7A and 8A are clamp portions provided for lamination fixation and particularly for improving strength.

The clamps 7A and 8A for improving strength
Are the intermediate positions between a plurality of (four in FIG. 3) bolt holes 11, the XX axis and the YY shown in FIG.
It is formed at a position shifted from the axis by an angle θ. The direction of the XX axis shown in FIG. 3 indicates the direction of the main magnetic flux.
Further, in this embodiment, as shown in FIG. 4, the protrusion 14 of the clamp portion is curved in an arc shape. That is, the semicircular curved axis of the clamp is radially arranged from the center of the inner diameter of the stator core. Accordingly, when the protrusions 14 are inserted into the backs of the next protrusions 14 during stacking of the cores, the interference is increased, the fastening force is increased, and the strength of the laminated core can be increased.

As described above, the improvement of the internal strength is achieved by preventing deformation of the laminated core due to insertion pressure generated when a large number of coils (not shown) are inserted into the slots 3.
And cores 2 located at the upper and lower ends of stator core 1A
A, 2A 'has the effect of being able to completely eliminate the lifting. In addition, the laminated core is formed in the mold at the time of press punching, and there is an effect that there is no defect that the laminated core peels off after being discharged out of the mold. Further, after assembling the motor, the stator core 1A is firmly fixed because it is screwed and fixed through the bolt holes 11 with bolts, and the intermediate portions of the bolt holes are fixed by the clamp portions 7A and 8A, so that the entire stator core 1A is fixed. It is fixed in a good balance.

According to this embodiment, the productivity is high and the most important magnetic characteristics of the single-phase induction motor are not reduced.
There is an effect that the strength of the stator core can be improved. Further, by mounting the single-phase induction machine using the stator core of the present embodiment on a hermetic electric compressor used in a refrigerator or the like, noise, vibration, and the like generated due to the stator core can be reduced. Further, it is possible to prevent the deformation of the core and the lifting of the laminated core due to the coil insertion force generated during the winding work of the stator, which can contribute to a reduction in production cost.

[0018]

As described above in detail, according to the present invention, the punching oil does not enter into the concave portion of the clamp portion, the strength of the stator core is increased, and the productivity is improved without deteriorating the characteristics. A stator core having a core 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 an enlarged sectional view showing a state of forming a clamp portion of the stator core of FIG. 1;

FIG. 3 is a plan view of a stator core according to another embodiment of the present invention.

FIG. 4 is an enlarged sectional view showing a state of forming a clamp portion of the stator core of FIG. 3;

FIG. 5 is a plan view of a conventional stator core.

FIG. 6 is an enlarged cross-sectional view taken along the line AA of the clamp portion of FIG.

FIG. 7 is a plan view of another conventional stator core.

FIG. 8 is an enlarged cross-sectional view taken along the line BB of the clamp unit of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A Stator core 2, 2 ', 2A, 2A' Core 3 Slot 4 Teeth 5 Core effective back 6, 7, 8, 8, 6A, 7A, 8A Clamping part 9, 14 Projection part 11 Bolt hole 12 Punching oil 13 Escape hole

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Yuji Kumagai 800, Tomita, Ohira, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Inside the Tochigi Plant, Hitachi, Ltd. (56) References JP-A-52-156305 (JP, A) JP-A-60-170534 (JP, A) JP-A-53-88104 (JP, A) JP-A-59-132737 (JP) JP, A) Japanese Utility Model Showa 60-51750 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 1/18 H02K 15/02

Claims (1)

(57) [Claims] 1. A plurality of cores each comprising a plurality of slots for inserting a coil, a plurality of teeth forming a magnetic circuit, and a core effective back portion, which are provided via an uneven clamp portion provided on an outer peripheral portion of the core. in the stator core to form a laminated core with single layered, out into a circular shape of the clamping portion
A stator core characterized in that a relief hole for punching oil used for punching a steel plate is provided in the recessed portion .