JPH09191587A - Stator core of rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core of a rotating electric machine which has a small number of part items, a smaller manhour of work and high rigidity. SOLUTION: This stator core is provided with a laminated core 1 formed by laminating a plurality of thin iron plates, an end ring 2 provided on both sides in the axial direction of the laminated core 1, a screw hole 22 for mounting a bracket, which is provided in the end surface in the axial direction of the end ring 2 and a threaded hole 23 for a hanging-up bolt, which is provided in the outer circumference of the laminated core 1. Further, this stator core is provided with a pair of through holes 13 passing therethrough in the axial direction, which are provided at predetermined intervals in a plurality of positions close to the outer circumference of the laminated core 1 and a connecting bar 30 formed by die-casting together with the end ring 2 in the through holes 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core of a frameless rotating electric machine in which the outer cover is not provided outside the stator core and the stator core is exposed.

[0002]

2. Description of the Related Art Conventionally, a stator core of a frameless rotating electric machine has an angular outer peripheral portion and an inner peripheral portion in which a plurality of winding slots 11 are arranged, as shown in FIGS. 4 and 5, for example. A joining member includes a laminated core 1 in which thin iron plates are laminated, an end ring 2 that compressively holds the laminated core 1 from both sides in the axial direction, and a plurality of coupling members 3 arranged across the outer peripheral surface of the end ring 2. 3 and the laminated iron core 1 are fixed by welding (for example, Japanese Patent Laid-Open No. 1-1100).
No. 31). In this case, the laminated core 1 and the end ring 2
Is provided with cooling air holes 12 and 21 penetrating in the axial direction,
The end ring 2 is provided with a screw hole 22 for fixing the bracket and a screw hole 23 for a hanging bolt.

[0003]

However, in the above-mentioned prior art, there is a problem that the number of machined parts such as the end ring and the connecting member is large and the cost is high. Further, since the joining member and the laminated core are fixed by welding, when the laminated core is formed of a thin iron plate whose surface is insulated, such as a silicon steel plate, the thermal effect on the laminated core is large, and the electrical properties of the laminated core are large. The characteristics may deteriorate. Further, there is a problem that a large number of man-hours are required because it is necessary to perform temporary assembly before welding work and there are many welding points. Also, since the threaded holes for suspension bolts are provided in the end ring, the end ring cannot be thinned.Therefore, during the winding work, the winding hits the end ring and the insertion work into the winding slot is performed. There was also the problem of difficulty. An object of the present invention is to provide a stator core of a rotating electric machine which has a small number of parts and processing steps and has high rigidity.

[0004]

In order to solve the above problems, the present invention provides a laminated core formed by laminating a plurality of thin iron plates, and an end ring provided on both end faces of the laminated core in the axial direction. In a stator core of a rotary electric machine that includes a bracket mounting screw hole provided on the axial end surface of the end ring and a lifting bolt screw hole provided on the outer periphery of the laminated iron core, close to the outer periphery of the laminated iron core. It is provided with a pair of through holes penetrating in a plurality of positions at predetermined intervals and penetrating in the axial direction, and a connecting bar formed in the through hole together with the end ring by die casting. The bracket mounting screw holes and the lifting bolt screw holes are formed between the pair of connecting bars.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention, which is indicated by X in FIG.
FIG. 2 is a front view showing a side sectional view taken along the line -OX '. In the figure, 1 is a laminated iron core formed by laminating a plurality of thin iron plates 10, 11 is a plurality of slot grooves provided for mounting armature windings on the inner periphery of the laminated iron core 1, and 12 is a laminated iron core. 1. Cooling air holes provided at four positions separated by a predetermined angular pitch in the circumferential direction of 1, and 13 are positions close to the outer periphery of the laminated iron core 1, and a predetermined space is provided between adjacent cooling air holes 13. It is a pair of through-holes that penetrate in the axial direction. Reference numeral 2 denotes an end ring which is provided on both end surfaces of the laminated core 1 in the axial direction and holds the laminated core 1 under compression, and is formed by die casting of an aluminum alloy or the like. 30 is a laminated iron core 1
It is a connecting bar that is filled with the end ring 2 in a pair of through holes 13 provided in the die by die casting. 21
Is a cooling air hole provided in the end ring 2 and communicates with a cooling air hole provided in the laminated iron core 1. Reference numeral 22 denotes a screw hole provided in the end ring 2, which is arranged between a pair of connecting bars 30 as shown in FIG. No) is fixed. Reference numeral 23 is a screw hole for a hanging bolt provided on the outer periphery of the laminated iron core 1, and is arranged between a pair of connecting bars 30 as shown in FIGS. 3 (b) and 3 (c). The slot groove 11, the cooling air hole 12, and the through hole 13 are processed at the same time when the thin iron plate 10 is formed by pressing, and are laminated so as to penetrate the laminated iron core 1 in the axial direction. The screw holes 22 and 23 are formed by machining the end ring 2 and the connecting bar 30 on the laminated iron core 1 by die casting.

With such a structure, since the connecting bar 30 is formed by die casting, the connecting bar 30 contracts during cooling, and the laminated core 1 can be firmly compressed and held in the axial direction. Further, since the connecting bars 30 formed by die casting are provided on both sides of the screw holes 22 and 23, the laminated core 1 around the screw holes 22 and 23 is reinforced and the screw holes are strengthened. Therefore, the threaded holes 13 for hanging bolts can be provided at any position of the laminated iron core 1 without providing the threaded holes 13 in the end ring 2, so that the end ring can be thinned and the winding can be inserted into the winding slot. Work becomes easy.

[0007]

As described above, according to the present invention, connecting bars are formed on both sides of a screw hole for mounting a bracket or a screw hole for a hanging bolt by die casting, and the laminated core is compressed in the axial direction. Since it retains and reinforces the periphery of the screw hole, there is no need for mechanical processing such as the conventional coupling member, the end ring can be made thinner, and the winding man-hours are reduced. Therefore, there is an effect that the number of parts and the number of processing steps are small and a stator core of a rotating electric machine having high rigidity can be provided.

[Brief description of the drawings]

1 is a side sectional view taken along the line X-OX 'in FIG. 2 showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 shows an embodiment of the present invention (a) AA ′ in FIG.
FIG. 3 is a cross-sectional view of a main part along the cross section, (b) a front cross-sectional view of the main part along the BB ′ cross section of FIG. 1, and (c) a side cross sectional view along the CC ′ cross section of FIG.

FIG. 4 is a side sectional view showing a conventional example.

FIG. 5 is a front view showing a conventional example.

[Explanation of symbols]

1: laminated core, 10: thin iron plate, 11: winding slot, 1
2, 21: Cooling air hole, 13: Through hole, 2: End ring, 22, 23: Screw hole, 30: Connection bar

Claims (3)

[Claims] 1. A laminated iron core formed by laminating a plurality of thin iron plates, end rings provided on both axial end faces of the laminated iron core, and bracket mounting screws provided on axial end faces of the end ring. In a stator core of a rotating electric machine comprising a hole and a screw hole for a lifting bolt provided on the outer periphery of the laminated core, a pair of pairs provided at a plurality of positions close to the outer periphery of the laminated core at predetermined intervals. A stator core of a rotary electric machine, comprising: a through hole penetrating in the axial direction; and a connecting bar formed by die casting together with the end ring in the through hole. 2. The stator core of a rotating electric machine according to claim 1, wherein the bracket mounting screw holes are formed between the pair of connecting bars. 3. The stator core of a rotary electric machine according to claim 1, wherein the lifting bolt screw holes are formed between the pair of connecting bars.