JPS6158439A - Salient pole type rotor - Google Patents

Abstract

PURPOSE:To allow to provide equalized elongation and stress of threads and a main stem of stud connecting end plate provided at the both ends of an iron core, by forming the stud so as to have approximately the same size at its core diameter of the thread and the outer diameter of the stem. CONSTITUTION:A magnetic core 2 respectively have an end plate 8 at both ends of an iron core 7, which is formed by laminating thin iron plates 6, and fastened by double end studs 10 passing therethrough after applying a predetermined pressure thereon. The studs 10 have approximately the same size at the core diameter of the thread 10b and of the outer diameter of the main stem. With such a structure, it can allow to provide equalized elongation and stress to the thread 10b and the main stem 10a.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a salient pole rotor.

[Background of the invention]

2 and 3 show conventional examples of salient pole rotors. As shown in the figure, a magnetic pole core 2 is attached at a predetermined interval in the circumferential direction of a rotating shaft 1, and is fixed by a tapered liner 3. Wheel 4 is attached. These are supported by a bearing 5 that supports the rotating shaft 1.

In the salient pole type rotor constructed in this manner, the rotary shaft l is supported at both ends by bearings 5, so that a dependence δ occurs due to the weight of the rotor itself, the pole iron core 2, and the field wire ring 4.

If there is an imbalance between the magnetic pole core 2 and the field wire ring 40,
The deflection δ becomes even larger due to centrifugal force during operation. When the rotating shaft 1 urges, the tapered liner 3 is attached to the rotating shaft 1.
The magnetic pole core 2, which is fixed and attached, is also bent as shown in FIG.

As shown in FIG. 4 above, this magnetic pole core 2 includes a thin iron plate 61! ! End plates 8 are provided at both ends of the i-laminated iron core 7, and after passing through these and applying a predetermined pressure, they are fastened with bolts, that is, double-threaded bolts 9. Regarding this matter, Japanese Patent Application Laid-Open No. 51-9600
There are some disclosed in 4. As shown in FIG. 5, this double-threaded bolt 9 has a threaded portion 9a.
Normally, the outer diameter is larger than the diameter of the trough of the threaded portion 9b and approximately the same as the outer diameter of the threaded portion 9b, and therefore the cross-sectional area of the trough of the threaded portion 9b is smaller than the cross-sectional area of the trunk 9a. Magnetic pole core 2
When the double-threaded bolt 9 is bent, the double-threaded bolt 9 is also bent in the same way, and an elongation force is applied to the double-threaded bolt 9 due to the shrinkage δ0, but the elongation and stress of the double-threaded bolt 9 are Elongation is e, total load is P, length of bolt 9 is 41 Bolt 9
If the cross-sectional area of is human, the elastic modulus is E, and the stress of bolt 9 is σ, then e = P t / A E
−・” −(1)σ=P/A ・・・
......It is expressed as (2). As shown in equations (1) and (2), when the total load P, the length t of the bolt 9, and the elastic modulus E are equal, the elongation e and stress σ of the bolt 9 are the cross-sectional area of the bolt 9. It is inversely proportional to A. In other words, the threaded portion 9b with a small cross-sectional area has a higher elongation e and stress σ than the main body 9a with a larger cross-sectional area. Therefore, due to the deflection of the magnetic pole core 2, the threaded portion 9b of the double threaded bolt 9 is
A large force was applied during machining a, and there was a risk that the screw 9b would be severed. This phenomenon is particularly noticeable in horizontal axis machines.

[Purpose of the invention]

The present invention was made in view of the above points, and an object of the present invention is to provide a salient pole type rotor that makes it possible to equalize the elongation and stress between the threaded portion of the bolt that fastens the magnetic pole core and the trunk. That is.

[Summary of the invention]

That is, the present invention includes a rotating shaft, a magnetic pole core fixed at a predetermined interval in the circumferential direction of the rotating shaft, and a field wire ring attached to the magnetic pole core, and the magnetic pole core is made of a thin iron plate. In a salient pole rotor in which end plates are provided at both ends of a laminated iron core and these are fastened with bolts, the diameter of the trough of the bolt and the outer diameter of the trunk are approximately the same. The bolt is characterized in that the diameter of the root of the threaded portion and the outer diameter of the trunk of the bolt are approximately the same.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. An embodiment of the invention is shown in FIGS. 1 and 6. FIG. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this example, the bolt (i.e. double threaded pole) 1
0, the diameter of the trough portion of the threaded portion 10b and the outer diameter of the trunk portion 10a were formed to be approximately the same. By doing this, the 9-double threaded bolt 10 has a root diameter φD of its threaded portion 10b and a trunk 1
A salient pole shape in which the outer diameter φD of 0a is almost the same, making it possible to equalize the elongation and stress between the threaded portion 10b of the bolt 10 that fastens the magnetic pole core 2 and the trunk 10a. You can get a rotor.

That is, the double-threaded bolt 10 was formed so that the root diameter φD of the threaded portion 10b and the outer diameter φD of the trunk 10a were substantially the same. By doing so, the double threaded bolt 10 is formed so that the root diameter φD of the threaded portion 10b and the outer diameter φD of the trunk 10a are approximately the same, and these threaded portions 10
The cross-sectional area of the valley part b and the trunk 10a are almost the same,
Even if the rotating shaft 1 is deflected due to its own weight and the weight of the magnetic pole iron core 2 and the field wire ring 4, and even if the deflection due to the centrifugal force during operation due to the imbalance of these weights increases, the threaded portion of the double-threaded bolt lO The elongation and stress of the trunk 10b and the trunk 10a can be made almost the same. Therefore, unlike in the conventional case, a large force is not applied to the threaded portion 10b during the machining of the trunk 10a, and there is no fear that the threaded portion 10b will be cut off, thereby improving the reliability of the magnetic pole core 2.

Another embodiment of the invention is shown in FIG.

In this embodiment, the bolt, that is, the double-threaded bolt 11, has a portion 11 of the same diameter, which is approximately the same as the outer diameter of the threaded portion 11b, on its trunk 11g.
It was formed by providing one place. By doing this, the trunk 11a of the double threaded bolt 11 comes into contact with the magnetic pole iron core at this same diameter portion 12, and as in the case described above, the balance of the double threaded bolt 11 is improved and deflection is reduced. be able to.

Although this embodiment has been described with reference to the case where the same diameter portion 12 is provided at one location, the bolt 11 is not limited to this only.
Depending on the length of the trunk 11a, a plurality of holes may be provided at appropriate portions of the length.

〔Effect of the invention〕

As described above, the present invention makes it possible to equalize the elongation and stress between the threaded portion and the stem of the bolt that fastens the magnetic pole core, thereby reducing the elongation and stress between the threaded portion and the stem of the bolt that fastens the magnetic pole core. It is possible to obtain a salient pole rotor that makes it possible to make stress uniform.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of the field poles of one row of the salient pole rotor of the present invention, FIG. 2 is a front view of a conventional salient pole rotor, and FIG.
The figure is a sectional view taken along the line B-B in Figure 2, Figure 4 is a longitudinal side view of the magnetic pole core of a conventional salient pole rotor, and Figure 5 is a diagram of the magnetic pole core of a conventional salient pole rotor. Side view of the bolt, No. 6
7 and 7 are side views of bolts that fasten magnetic pole cores of different implementation rows of the salient pole rotor of the present invention. 1... Rotating shaft, 2... Magnetic pole iron core, 4... Field wire ring, 6... Thin iron plate, 7... Iron core, 8... End plate, 10... Double threaded bolt (Bolt), 10a...
- Trunk, 10b... Threaded part, 11... Double threaded bolt (bolt), 11a... Trunk, llb... Threaded part,
12...Same diameter part.

Claims (1)

[Claims] 1. A rotating shaft, a magnetic pole core fixed at a predetermined interval in the circumferential direction of the rotating shaft, and a field wire ring attached to the magnetic pole core, the magnetic pole core comprising: In a salient pole rotor in which end plates are provided at both ends of an iron core made of laminated thin iron plates, and these are fastened with bolts, the diameter of the trough of the bolt and the outer diameter of the trunk are A salient pole rotor characterized by being formed almost identically. 2. The salient pole rotor according to claim 1, wherein the bolt has at least one portion on its trunk having the same diameter as the outer diameter of the threaded portion.