JPS5911744A - Cylindrical synchronous generator with rectifier load - Google Patents

Abstract

PURPOSE:To prevent a synchronous generator from vibrating at the operating time by providing an additional unit made of an iron or magnetic material for a wedge in a rotor slot. CONSTITUTION:A field coil 16 is contained in an insulated state in a rotor slot 10, and a wedge 12 is disposed in the hole of the slot 10. An additional part 22 which is made of an iron or magnetic material is insulated and disposed through an insulating liner 20 between the wedge 12 and the coil 16. In this manner, since orthogonal axis transient reactance increases, the vibration of a synchronous generator at the operating time can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a synchronous generator equipped with a rectifier load, and particularly to a cylindrical synchronous generator that can increase the direct axis transient actance and prevent occurrence of hunting etc. It is something.

Generally, a cylindrical synchronous generator is known as a synchronous generator with a rectifier load. However, in this case, when using a normal cylindrical generator, the horizontal axis synchronous reactance
, and the direct axis transient actance x'd: Xq/X' d
becomes larger than 2, and there is a high possibility that hunting or the like will occur.

For this reason, conventional generators have been designed to have larger electrical dimensions than generators with normal output, resulting in a significant increase in manufacturing costs. Furthermore, as a measure to eliminate vibrations caused by the transient operating characteristics of a synchronous generator with a rectifier load, a cylindrical synchronous generator is proposed in which a horizontal axis winding with two layers of field windings is provided. However, this type of cylindrical synchronous generator has the disadvantage that the structure and assembly work are complicated because the field winding is wound in two layers.

However, in this type of cylindrical synchronous generator, the horizontal axis synchronous reactance X or the horizontal axis transient actance
, and the ratio of the direct axis transient reactance X'd (: x9(x'
9'/"d J is required to be 2 or less. The above-mentioned conventional cylindrical synchronous generator equipped with a horizontal axis winding in which the field winding is wound in two layers has a horizontal axis synchronous reactance X , we are considering changing X to X (x q is smaller than X) and making the ratio of X q / X d smaller than 2. Therefore, it is conceivable to make X'd larger than that of a normal cylindrical synchronous generator.In this way, in order to increase Xd, the leakage reactance of the stator and the leakage reactance of the rotor must be increased. However, in order to increase the leakage reactance of the stator, it is necessary to lengthen the slot of the stator in the radial direction, and in this case, the outer diameter of the 1th'1 stator becomes too large, which becomes uneconomical. Therefore, in order to increase Xd,
It is preferable to increase the leakage reactance of the rotor. Therefore, as a means to increase the side slippage γ actance of the rotor, it is possible to change the shape of the rotor shaft 10 of a normal equipment as shown in FIG. 1 to the head of the wedge 12 as shown in FIG. In addition, a structure is proposed in which the part gap 14 is made higher or the head gap 14 of the wedge 12 is narrowed as shown in FIG. 6. In addition, in FIGS. Reference numeral 16 indicates a field winding, and 18 indicates an insulator. However, increasing the height of the head gap 14 of the wedge 12 is not economical because the field winding 16 becomes smaller and prevents effective use of the equipment. In addition, the head cavity 14 of the wedge 12
Narrowing the field windings 16 to the rotor slots 10
It becomes impossible and impractical to insert it inside.

Therefore, the inventor of the present invention has conducted various studies to find a means to overcome all the problems of the conventional cylindrical synchronous generator equipped with a rectifier load and increase the leakage reactance of the rotor slot. Without changing the shape of the rotor slot, for example, a piece of iron (magnetic material) is placed between the wedge and the field winding for the wedge inserted to stabilize the field winding m′jfc+b+. Or, by composing a part of the wedge with iron (magnetic material), the field leakage magnetic flux can easily pass through the additional part, and the direct axis transient actance related to this magnetic flux can be increased. I discovered that the problem could be resolved.

Therefore, an object of the present invention is to increase the direct axis transient actance by providing an additional part made of iron or magnetic material for the wedge in the rotor slot, thereby effectively achieving vibration prevention during operation. The object of the present invention is to provide a cylindrical synchronous generator with a rectifier load that obtains.

In order to achieve the above object, the present invention provides a cylinder in which a field winding is housed in an insulated state in a rotor slot, and the field winding is fixed by inserting a wire into an opening of the rotor slot. It is characterized by providing an additional part made of iron or a magnetic material to the wedge.

In the above-mentioned cylindrical synchronous generator, the additional part made of iron or a magnetic material can be constituted by an iron piece provided between the field winding and the coil with an insulating liner interposed therebetween. In this case, it is preferable to carve a groove on one side of the iron piece to prevent the generation of eddy current.

Alternatively, the additional portion may be made of iron or magnetic material.
It is also possible to configure it with a part of a wedge. In this case, it is preferable to provide grooves for preventing eddy current generation on the bottom surface of the wedge. Further, it is preferable that one side of the wedge is fixed to the wall of the rotor slot, and a gap is provided between the other side of the wedge and the wall of the rotor slot. Furthermore, by inserting an insulator into the gap, the wedge can be securely fixed.

Next, an embodiment of a cylindrical synchronous generator with a rectifier load according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, the same reference numerals will be used to describe the same components as those of the conventional device shown in FIGS. 1 to 6.

FIG. 4 shows an embodiment of a cylindrical synchronous generator according to the present invention. That is, in FIG. 4, the shape of the rotor slot 10 is almost the same as the conventional one.
2. First, in the rotor slot 10, the field winding 16 and the winding 1 are placed.
2 and are housed and arranged via the insulator 18)1. Ru. In this case, the position of the wedge 12 is determined in substantially the same manner as in the conventional structure, and an iron piece 22 is insulated between the wedge 12 and the field winding 16 via an insulating liner 20.

By housing and fixing the field winding 16 in the rotor slot 10 in this manner, the gap 24 of r2 between the iron piece 22 and the wall surface of the rotor slot 10 can be made narrower, as shown in FIG. As shown, the field leakage flux easily passes through the iron piece 22, and as a result, the direct axis transient 7 related to the field leakage flux
'Cutance xd becomes a dog. This allows the air gap 24 of this embodiment to positively fulfill the function of the air gap 14 in FIG. 2. In this embodiment, when using the iron piece 22, an eddy current is generated due to spatial harmonic magnetic flux within the gap between the stator and the rotor, so grooves are formed on one side as shown in FIGS. It is preferable if 26 is carved '1'.

Furthermore, since the iron piece 22 moves during operation,
It is preferable to impregnate the gap in the rotor slot 10 with epoxy resin or the like, or to secure both ends of the iron piece 22 by using glass lobes or the like on the end 15II of the field winding 16.

FIG. 7 shows another embodiment of the cylindrical synchronous generator according to the present invention. It shows. That is, in this embodiment, a wedge 28 having a piece of iron (magnetic material) is used. In this case, if all the wedges 28 are made of iron (magnetic material),
This is not preferable because it is difficult to control the value of the direct-axis transient actance Xd and the field current increases significantly.

Also, the insulator 18 can be lengthened with the head gap of the wedge 28 in the slot 10 to directly Ii! 28 and the rotor teeth should not come into contact with each other. Further, it is preferable that the surface of the wedge 28 is grooved as shown in FIG. In this embodiment, it is also possible to replace the insulator 18 with a new insulator i+R to provide the same function as the head cavity 14 in the conventional bundle.
J'Noh. Therefore, according to this embodiment, FIG.
Compared to the embodiment shown in FIG. 3, the field winding 16 can be arranged up to the iron piece 22, so that the single efficiency of the rotor can be further increased.

FIG. 8 shows a modification of the embodiment shown in FIG. That is, in this example, the shape of the wedge 28 is changed, and a flat surface is provided on the sleeve 28 so that the size of the head gap 14 with respect to the wedge 2B is accurate, and the leakage flux path and the It is characterized in that one side of the rotor 28 is configured to be brought into contact with the rotor teeth. According to C1, according to this embodiment,
If the direct axis transient actance xd can be machined to a high precision of 1#', then by fixing the shaft 28 and the rotor teeth by, for example, welding, the shaft 28 can be laminated to prevent it from being pulled out. The advantage is that the rotor can be prevented from expanding into a fan shape.Furthermore, by inserting an insulator into the gap 14, it is also possible to prevent the wedge 28 from loosening during operation. .

As is clear from the embodiments described above, according to the present invention,
Constructed with iron (magnetic material) in the rotor slot 1 - By providing the companion part in conjunction with the wedge, the direct axis transient actance
d'f: Can be made more sensitive than normal equipment, and the ratio of horizontal axis synchronous IJ'7 actance Xq to direct axis transient actance Xd is set to 2 or less with normal equipment dimensions. be able to. In this case, the conventional horizontal @
The 11th winding can be omitted.

Therefore, the present invention is applicable not only to the cylindrical synchronous optical 1d machine with the rectifier load described above, but also to the following transient synchronizing actanne X
The present invention can also be suitably applied to a power generator in which it is desired to reduce the short-circuit capacity in the time domain of the direct axis transient actance X'd in a system having a circuit breaker that cannot be broken in 2 to 6 cycles in the time domain of d. Furthermore, the present invention can also be applied to a generator equipped with an excitation device in which the excitation voltage changes instantaneously due to a large leakage flux of the field, in which a constant field current is configured to flow.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main part showing the basic configuration of the rotor slot structure in a conventional synchronous generator, and FIG. 2 is a cross-sectional view of the main part showing an example of an improved rotor slot structure in a conventional cylindrical synchronous generator. Fig. 3 is a cross-sectional view of main parts showing another example of improvement of the rotor slot structure in a conventional cylindrical synchronous generator;
The figure is a cross-sectional view of a main part showing one embodiment of the rotor slot structure in a cylindrical synchronous generator according to the present invention, and FIG. Figures 6a and b are plan and side views showing an example of the structure of the iron piece shown in Figure 4, and Figure 7 is another implementation of the rotor slot structure in the cylindrical synchronous generator of the present invention. FIG. 8 is a cross-sectional view of a main part showing a modification of the embodiment shown in FIG. 7. 10... Rotor slot 12... Wedge 14.
...Head gap 16...Field winding 1B...Insulation
Body 20... Insulating liner 22... Iron piece 24...
...Gap 26...Groove 28...Wedge

Claims (1)

[Claims] (1) A field winding is housed in an insulated state in a rotor slot, and a wedge is inserted into the opening of the rotor slot to fix the field winding. A cylindrical synchronous generator equipped with a rectifier load, characterized in that the generator is equipped with a cylindrical rotor, and is provided with an additional part made of iron or magnetic material for the wedge. [2] In the cylindrical synchronous generator described in claim 81!1, the additional portion made of iron or magnetic material is formed from an iron piece provided between the field winding and the wedge via an insulating liner. A cylindrical synchronous generator with a rectifier load. (3) A cylindrical synchronous generator according to claim 2, which is equipped with a rectifier load having grooves cut into one side of the iron piece to prevent eddy current generation. (4) In the cylindrical synchronous generator according to claim 1, the additional portion made of iron-sized magnetic material has a cylindrical shape with a rectifier load consisting of a part of the wedge. (5) The cylindrical synchronous generator according to claim 4, which is equipped with a rectifier load having a groove for preventing eddy current generation carved into the bottom surface of the cylindrical synchronous generator. (6) In the cylindrical synchronous generator according to claim 4 or 5, one side of the cabinet is fixed to the wall of the rotor slot, and the other side of the cabinet is fixed to the wall of the rotor slot. A cylindrical synchronous generator equipped with a rectifier load having a gap between the two. (7) A cylindrical synchronous generator 1 according to claim 6.
A cylindrical synchronous generator with a rectifier load made by inserting an insulator into the gap and fixing a wedge.