JPS5930591Y2 - Stator structure of rotating electric machine - Google Patents

Description

[Detailed description of the invention] This invention relates to the stator structure of a rotating electrical machine, and more specifically, the stator used in a large-capacity, large-scale rotating electrical machine such as a water turbine generator is constructed using an annular core. and a divisible stator outer frame, the stator core is inserted into the annular core, and the core is integrally attached to the stator outer frame.

In recent years, the demand for electricity has been increasing year by year due to the development of industry and the spread of electrification in households, but in order to meet this demand, each electric power company is making efforts to secure power sources. The construction of hydroelectric power plants is being strongly promoted in parallel with the construction of thermal and nuclear power plants.

In particular, in the current situation where construction of thermal and nuclear power plants is difficult due to constraints such as location conditions, the construction sites of hydroelectric power plants are being completely reviewed in order to secure backup power. Hydrogen generators are becoming more and more dog-shaped due to technological demands for larger capacity and faster speeds.

By the way, hydroelectric power plants have conventionally been required to be constructed in locations that meet the geographical conditions of obtaining a high head, so mountainous areas are generally selected.

Such construction sites are extremely far away from the water turbine generator manufacturing factory, and the stator, which is a raw hard component of the generator, is generally large in external dimensions.
It is difficult to transport the stator to the site in a fully assembled state.

Therefore, as shown in Figure 1, the stator is usually manufactured by dividing it into two parts, and after transporting this state to the construction site,
The work procedure was to assemble the stator by tightening it all together on site.

That is, FIGS. 1 and 2 show the structure of a stator of a large-capacity rotating electrical machine according to the prior art, in which the stator frame 1
0 and the stator core 12 inserted through the center thereof are each divided into two at the seam 14.

These semi-dead stator frame 10 and iron core 12 are tightened and integrated after interposing an elastic liner such as Kringerite at the proportion seam 14 for vibration isolation, and then a seam coil is inserted into this stator core. The stator was completed by connecting the coil to the stator coil 16.

However, with this method, the workability of inserting the coil on-site is extremely poor, and there are also disadvantages such as lower quality reliability than when directly assembling at a factory, and the number of on-site work processes increases and becomes more complicated. Furthermore, according to the conventional two-part method described above, the mechanical strength at the seam is poor, so the overall rigidity is low, and the contact pressure at the seam decreases due to aging due to long-term use. However, it also had inherent drawbacks such as often causing large excitation vibrations.

Therefore, as a result of various studies in order to solve the various drawbacks mentioned above, the inventor of the invention discovered a core in which the stator frame was manufactured as an annular integral part, and a stator outer frame that supported this core (this outer frame was The stator coil is installed on the core and the lead connections are completed in advance at the factory, and then the core is installed on the stator outer frame on site. It was found that this would improve on-site work efficiency, shorten the construction period, and improve quality reliability.

Therefore, the general purpose of the present invention is to improve the on-site assembly workability of the stator of large-scale rotating electric machines such as large-capacity water turbine generators, to shorten the construction period, and to The goal is to improve quality reliability.

In order to achieve this objective distantly, the present invention consists of a stator frame consisting of a divisible stator outer frame and a ring-shaped core, and a stator coil is attached to the inner circumference of the core together with the stator core. It is characterized in that it is inserted and fixed, and furthermore, a stator outer frame is integrally connected and fixed to the outer periphery of the core.

Next, the stator structure of a rotating electrical machine according to the present invention will be described in detail below using preferred embodiments.

In FIG. 3, reference number 1 indicates a stator outer frame, and for convenience of transportation, this stator outer frame 1B is divided into two halves at a seam 20, and the halves can be combined and tightened at the site. integrated by.

The stator must have sufficient rigidity to suppress vibrations caused by the power supply frequency, rotational speed, water wheel, etc., and to withstand the magnetic attraction force of the rotor.

Therefore, the stator outer frame 18 has a hollow box-shaped reinforced structure that is lightweight and advantageous in terms of rigidity.

Next, reference numeral 22 indicates a core having an annular integral structure,
A stator core 24 is inserted and fixed into the inner circumference of this core 22.

In this case, the stator core 24 is formed into an annular shape by stacking fan-shaped core plates so that they overlap each other by 1/2 in the circumferential direction, and is inserted tightly into the inner circumference of the core 22. Fix it.

The dimensions of the core 22 configured in this manner are set in advance so that the outer periphery of the core 22 can be attached to the stator outer frame 18 by means such as welding.

That is, the core 22 is manufactured as an integral ring in a factory, and after the stator 24 is inserted into the core 22, the stator coil 26 is attached and the coil connection is completed before being transported to the site.

At the site, the stator outer frame 18, which has been divided into two parts, is tightened and integrated at the joint 20, and then the core 22 is attached to the outer frame 18.

This installation is done using the core 22 as shown in Figure 4.
The outer periphery of the core 22 and the inner periphery of the outer frame 18 have a so-called seal structure, and both members are brought into contact with each other so that the weight of the core 22 is supported by the seal part 28 of the outer frame 18, and this abutting part is welded or otherwise processed. It is recommended that they be combined integrally by the following means.

In this way, according to the present invention, the stator assembly can be completed by simply installing the stator coils in advance at the factory and attaching the core, which has completed the coil wiring, to the stator outer frame on site, so it is not necessary to assemble the stator as before. This will significantly improve workability, shorten the process and construction period, and improve reliability of quality compared to when the coils are assembled and wired on site.

Regarding this improvement in workability, if the outer circumference of the stator frame or air cooler is configured in a polygonal shape to install the stator frame or air cooler, workability is poor because the coils must be inserted horizontally. However, if the core structure is adopted as in the present invention, the coils can be inserted while the core is placed on a roller and rotated, so the workability in that respect is also improved.

Furthermore, in the present invention, as mentioned above, the stator core is inserted and fixed into the inner circumference of the core, and the core plates, which are punched out in a fan shape from the stator core, are overlapped by 1/2 in the circumferential direction. By laminating them into an annular shape, the core and stator core are constructed as an integral ring, so the rigidity of the completed stator is extremely high compared to the conventional method, and the core and stator core are There are no gaps in the stator core, so
Advantages such as the above-mentioned excitation vibration caused by the reduction in surface pressure at the seam do not occur.

Although the stator structure of a rotating electric machine according to the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and many improvements and changes can be made within the spirit of the invention. It's worth it.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a stator of a rotating electrical machine according to the prior art, FIG. 2 is a vertical cross-sectional end view of the stator shown in FIG. 1, and FIG. 3 is a schematic front view of a stator of a rotating electrical machine according to the present invention. 4 are detailed sectional views of the stator shown in FIG. 1. 10... Stator frame, 12... Stator core, 14... Joint, 16... Stator coil, 18... Stator outer frame, 20...
・Joint, 22... Core, 24... Stator core, 25... Stator coil, 28...
... Inkobe.

Claims (2)

[Scope of utility model registration request] (1) The stator frame is composed of a divisible stator outer frame and an annularly molded core, the stator coil is inserted and fixed together with the stator core into the inner circumference of the core, and the stator coil is inserted and fixed into the inner circumference of the core, and A stator structure for a rotating electrical machine, characterized in that a (supporting) electronic outer frame is integrally bonded and fixed to the outer periphery of the child. (2) Utility Model Registration In the stator structure described in claim 1, the stator core that is inserted and fixed into the inner circumferential part of the core is a fan-shaped core plate that is punched out in half in the circumferential direction. A stator structure for a rotating electric machine that is made of layers stacked one on top of the other to form an annular shape.