JPH0888947A - Salient pole type magnetic pole core - Google Patents

Abstract

PURPOSE: To obtain a fixed structure of a salient pole type magnetic pole core which dispenses with machining and production manhour of a laminated core and is economical. CONSTITUTION: By providing welded parts 11 and 12 in the lateral side part of a laminated core constituting a magnetic pole core 2 and in the periphery of a screw hole 21 in the bottom part to which a stud 5 is joined in a screwing manner, respectively, the laminated core is integrated and a tightening force of the stud 5 joined to the screw hole 21 of the magnetic pole core 2 is maintained, while the magnetic pole core 2 and a rotor yoke 1 are fastened and fixed by a nut 6 provided at the other end of the stud 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a salient pole type magnetic pole core of a large rotating electric machine, and more particularly to a fixing structure of a rotor yoke provided on a rotor shaft and a magnetic pole core by studs.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are sectional views of a conventional salient pole type magnetic pole core. FIG. 4 is a longitudinal sectional view of an essential part of a rotary electric machine having a salient pole type magnetic pole core, and FIG. V-of magnetic pole core 2
It is a V sectional view. In an industrial rotating electrical machine, the structure of fixing the salient pole type magnetic pole core to the rotating shaft of the rotor yoke etc. is based on the fixing method with the wedge-shaped dovetail provided at the bottom of the magnetic pole core, the fixing method with the screw connection with the stud, etc. However, the stud method is applied to the fixing of salient pole type magnetic pole cores of large and small rotating electric machines having large torque characteristics such as medium to low speed rotating electric machines. As shown in FIGS. 4 and 5, a rotating electric machine including a salient pole type magnetic pole core according to the stud system includes a stator core 13 that accommodates a stator coil 14 covered by a cover 16 and supported by a stator frame 15. A magnetic pole core 2 having a field coil 4 fixed by studs 15 to a rotor yoke 7 provided on the rotor shaft 10, and a fan 17 connected to the rotor yoke 7 for air cooling the inside of the machine. ing.

The salient pole type magnetic pole iron core is a magnetic pole iron core 2 formed of a laminated iron core formed by laminating a plurality of thin steel plates processed into a predetermined shape by laser or press, and closely arranged on both end faces of the magnetic pole iron core 2. The magnetic pole end plate 3 and a cored bar 7 arranged in a through hole provided in each of the laminating direction of the magnetic pole core 2 and the magnetic pole end plate 3, and the magnetic pole core 2 is made of a magnetic material. The mandrel 7 and the magnetic pole end plate 3 are welded and joined so as to maintain a predetermined surface pressure in the laminating direction applied from the extreme plate 3. In the salient pole-shaped magnetic pole core thus obtained, one end of the stud 5 is inserted into the through holes 50 provided in the bottom of the magnetic pole core 2 to the core metal 7 and the rotor yoke 1, respectively. The magnetic pole core 2 is screwed to a cored bar 7 in the laminated core, and the other end is tightened with a nut 6 and fixed to the rotor yoke 1.

[0004]

In order to fix the salient pole type magnetic pole core to the rotor yoke 1, the structure in which the stud 5 is screwed to the mandrel 7 penetratingly arranged in the laminated core of the magnetic pole core 2 is used. Since it is used, it has a structure that can withstand mechanical strength against centrifugal force, electromagnetic force, etc. due to the rotation of the salient pole type magnetic core. However, as described above, in the conventional salient pole-type magnetic pole core fixing structure, since through holes are provided in the laminated core and the magnetic pole end plate 3 in order to dispose the cored bar 7 therethrough, the material of the laminated core of the magnetic pole core 2 and There is a problem that the manufacturing and processing cost becomes high, and that the stacking work and the assembling and manufacturing work take time.

An object of the present invention is to provide an economical fixing structure for salient pole-shaped magnetic pole cores, in which the number of machining and manufacturing steps of laminated cores of magnetic pole cores, which solves the above-mentioned problems, is significantly reduced.

[0006]

In order to solve the above-mentioned problems, the present invention provides a magnetic pole core in which a side surface portion and a bottom surface portion of a laminated iron core are integrally joined by welding, and a bottom surface portion of the magnetic pole iron core. The stud is provided with a screw hole, and one end of the stud is screwed to the screw hole, and the other end of the stud is fastened and fixed to a rotor yoke that penetrates the stud by a nut.

Then, it is preferable that the side surface portion of the magnetic pole core made of a laminated iron core is welded together with the side plate.

Further, a side wall portion of the laminated core is integrally welded and joined together, and a magnetic pole core is integrally provided with a screw seat for screw connection with a stud in a laminating direction in the laminated core, and a stud insertion hole provided at a bottom portion of the magnetic pole core. It is further preferable to adopt a configuration in which one end of the stud inserted into the screw is screwed by this screw seat, and the other end is tightened and fixed to the rotor yoke penetrating the stud with a nut at the other end. Is.

[0009]

In the structure in which the salient pole type magnetic pole core and the rotor yoke are fastened and fixed by the stud, the structure in which the magnetic pole core and the stud are directly screwed together requires the least number of manufacturing steps and cost. However, in the structure in which the laminated core of the magnetic pole core is provided with a screw hole and the stud is screwed into the screw hole, it is difficult to maintain the surface pressure between the laminated surfaces made of the steel plates of the laminated core. There is a problem that a sufficient tightening force cannot be expected for the stud portion that is screwed together. Therefore, as described above, conventionally, a structure in which a cored bar is provided in the laminated core of the magnetic pole core and the cored bar and the stud are screwed together is adopted.

However, in the present invention, the magnetic pole core and the stud are directly screw-coupled to each other, and the side surface portion and the bottom surface portion are welded to each other while applying surface pressure from both end surfaces of the laminated core constituting the magnetic pole core. By doing so, the laminated core can sufficiently maintain the surface pressure even when the stud is screwed into the screw hole provided on the laminated surface of the laminated core, and the laminated surface is displaced in the laminating direction of the magnetic pole core. This made it possible to prevent the stud tightening force from decreasing. As a result, it is not necessary to perform machining to form a through hole through which a core bar penetrates in a thin steel plate that constitutes a laminated iron core as in the conventional case, so that the material cost and the manufacturing man-hour can be reduced and the salient pole type magnetic pole is economical. A fixed structure of the iron core can be obtained.

Further, according to the present invention, the magnetic pole cores and the studs are fixed to each other, instead of the above-mentioned conventional structure in which the side faces are welded and integrated to each other and the cores provided by penetrating the laminated iron core are provided. , A structure in which a screw seat is provided only in the portion of the laminated core that is screwed to the stud is adopted. Also by this, the thin steel plate only needs to be machined only in the laminated core portion that accommodates the screw seat, so that the material cost of the laminated core and the number of manufacturing steps can be reduced.

[0012]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a sectional view of a salient pole type magnetic pole core according to a first embodiment of the present invention. In addition, the figures are respectively the conventional FIG. 4 and FIG.
The same reference numerals are used for the same parts as in the conventional case, and a detailed description thereof will be omitted. In the magnetic pole core 2 made of the laminated core shown in FIG. 1, the stud 5 is directly screwed into the screw hole 21 provided in the magnetic pole core 2, and the stud 5 at the other end is provided in the rotor yoke 1. It is inserted into the through hole 51, and the magnetic pole core 2 and the rotor yoke 1 are clamped and fixed by a nut. This magnetic pole core 2 is
While applying surface pressure from the magnetic pole end plates 3 (FIG. 4) provided on both end faces of the laminated core, the side plates 8 made of steel plates are placed along both sides of the laminated core around which the field coil 4 is wound and arranged. The side plate 8 and the side face are welded and joined in the stacking direction, and the welded portion 12 that is welded and joined in the stacking and laminating direction is provided at a portion outside the screw hole 21 where the stud 5 at the bottom is inserted. The iron core is integrated.

As a result, since the surface pressure between the laminated surfaces of the laminated core can be maintained, the escape of the steel plates in the laminating direction can be prevented, and the screw hole 21 is machined in the bottom portion of the magnetic pole core 2. Can be provided. Further, the screw can be sufficiently tightened even when the stud 5 is screwed. In this case, the welded portion 12 at the bottom of the magnetic pole core 2 may be provided only at the peripheral portion of the screw hole 21.

Further, in this embodiment, the side surface portion of the magnetic pole core 2 is welded and joined along the side plate 8 made of a steel plate to maintain the mechanical strength of the laminated core in the laminating direction.
It is also possible to integrally join the laminated cores by welding without using the side plate 8.

2 and 3 are sectional views of a salient pole type magnetic pole core according to a second embodiment of the present invention, FIG. 2 is a sectional view of the salient pole type magnetic pole core, and FIG. 3 is III-III of FIG. FIG. The present invention is different from the first embodiment in that the tightening force of the stud 5 is not expected by the screw hole 21 of the magnetic pole iron core 2 in the first embodiment, and the stud is screwed in the conventional laminated iron core. Has been adopted. That is, as shown in FIG. 2 and FIG. 3, the fixing of the rotor yoke 1 and the magnetic pole core 2 by the stud 5 is carried out through the core metal core 2 which is threadedly connected to the stud 5 in the conventional magnetic pole core 2. 7
Instead of (FIG. 5), a screw seat 9 is provided only in a portion of the magnetic pole core 2 that is screwed to the stud 5, and the other end of the stud 5 screwed to this screw seat 9 has the other end of the magnetic pole core 2. It is carried out by inserting into the insertion hole 52 and the through hole 51 provided in the rotor yoke and tightening with the nut 6. Also in this embodiment, both sides of the laminated core and steel plates for mechanical reinforcement are applied while applying surface pressure in the laminating direction from the magnetic pole end plates 3 on both end faces of the laminated core constituting the magnetic pole core 2. A welded portion 11 is formed by welding and joining both ends of the side plate 8 to integrate the laminated core.

This embodiment is effective when applied to the structure of the first embodiment described above depending on the model when the tightening force when the stud 5 is screwed together is insufficient. Compared with the configuration in which the cored bar 7 is penetrated and arranged in the stacking direction of the laminated core, the laminated core of only the portion holding the screw seat 9 needs to be machined, so that the material cost and the manufacturing man-hour are reduced.

[0017]

As described above, according to the present invention, the side surface portion and the bottom surface portion of the laminated core forming the magnetic pole core are welded and integrated with each other to form a laminated surface of the laminated core of the magnetic pole core. Since a screw hole for a stud can be processed and provided, and a sufficient surface pressure can be maintained on the stud even when tightening the screw, the stud can be directly screwed to the magnetic pole iron core and attached to the rotor yoke. It was possible to fix it.

Further, according to the present invention, the side surface portion of the laminated core and the side plate are welded to have an integrated structure, and the magnetic pole core and the stud are coupled to each other by a screw seat and a screw coupling arranged in the laminated core of the magnetic pole core. I decided to do it. This makes it possible to greatly reduce the number of manufacturing steps and cost of the fixing structure of the rotor yoke of the salient pole type magnetic pole core, similarly to the above-described configuration in which the magnetic pole core and the stud are directly screwed together.

[Brief description of drawings]

FIG. 1 is a sectional view of a salient pole type magnetic pole core according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a salient pole type magnetic pole core according to a second embodiment of the present invention.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a longitudinal sectional view of a main part of a rotary electric machine having a conventional salient pole-shaped magnetic pole iron core.

5 is a VV cross section of the salient pole type magnetic pole core portion of FIG. 4;

[Explanation of symbols]

 1 rotor yoke 2 magnetic pole iron core 21 screw hole 3 magnetic pole end plate 4 field coil 5 stud 51 through hole 52 insertion hole 6 nut 7 core metal 8 side plate 11 welded portion 12 welded portion

Claims (3)

[Claims] 1. A salient pole type magnetic pole core in which a magnetic pole core made of a laminated core is clamped and fixed to a rotor yoke provided on a rotor shaft by a stud, and a side surface portion and a bottom surface portion of the laminated core are welded and joined. Integrated magnetic pole core and a screw hole provided on the bottom of this magnetic pole core.One end of the stud is screwed into this screw hole, and the nut provided at the other end penetrates the stud. A salient pole type magnetic pole core, characterized in that a magnetic pole core is clamped and fixed to a rotor yoke arranged. 2. The salient pole type magnetic pole core according to claim 1, wherein a side surface portion of the laminated core is welded and joined together with a side plate. 3. A salient pole type magnetic pole core obtained by clamping and fixing a magnetic pole core made of a laminated core to a rotor yoke provided on a rotor shaft by means of studs, and the side surfaces of the laminated core are welded and integrated. A screw seat that is screwed to the stud is provided in the stacking direction of the magnetic pole core, and one end of the stud inserted into the stud insertion hole provided at the bottom of the magnetic pole core is screwed to this screw seat, and the other end is A salient pole type magnetic pole core, characterized in that a magnetic pole core is tightened and fixed to a rotor yoke that penetrates a stud and is arranged with a nut provided.