JPS60102828A - Rotor of rotary electric machine - Google Patents

Abstract

PURPOSE:To enable to support a rim without providing a radial vent duct by reducing the inner diameters of a plurality of thin steel plates laminated on a rotor spoke smaller than that of the spoke. CONSTITUTION:A rim 3 is composed of sector-shaped rims 6, 8. The rim 6 is punched in a circular shape at the inner peripheral side, but the rim 8 is not punched at the inner peripheral side. Several rims 8 are laminated on the upside of a spoke lower plate 2c, and the rims 6 are laminated on the all remainder. A notch is formed by gasket at the portion which is contacted with a keeper 4 of the rims 8. Thus, since the rims 3 can be supported by merely laminating the rims 8 on the spoke lower plate 2c, the supporting vent duct can be eliminated to reduce the eddy current loss and the windage loss.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotor of a rotating electrical machine, and particularly to a mounting device for a rotor rim.

[Technical background of the invention and its shortcomings]

Generally, rotating electric machines are cooled by circulating air, and a ventilation method is used in which cooling air is forced into the gap between the magnetic pole faces and circulated using a fan attached to the end face of the rotor or a separately installed blower.

However, the rotor of a salient pole rotor, such as a water turbine generator, rotates at a relatively low speed and has a large diameter, so the circumferential speed of the rotor is high. When the stacking thickness is close to 4 m, it has become difficult to uniformly cool the stator in the axial direction by forcing the required air into the gap between the magnetic poles. Therefore, a ventilation method using the spokes and rim of the rotor as a blower has been used in recent years.

FIG. 1 is a sectional view of a water turbine generator showing one example. In the figure (-, 1 is a rotating shaft, 2 is a spoke attached to the rotating shaft 1 and has a ventilation hole 2a, and 3 is a spoke 2
3a is a plurality of radial ventilation ducts provided on the rim 3; 4 is a keeper 15 is a stopper for supporting the rim 3; Regarding rim 3, when it comes to large diameter machines, due to transportation restrictions, manufacturing limitations, etc.
As shown in Figure 2, a thin steel plate is punched into a fan shape using a press, and this fan-shaped rim plate is shifted in the circumferential direction while being punched in the axial direction, and the whole is fastened with through bolts (segment rim method consisting of two parts). In the case of this segment system, there are two main cooling field air channels, a radial ventilation duct 3a and a rim interplate duct 3b, as shown in FIG.

However, the ventilation by the radial ventilation duct) 3a is
Although the wind volume is non-wealth, the vortex θi living in 3a
There is a drawback that the windage loss increases due to the influence of the secondary flow n of air due to parallel operation with fb4 and the rim plate curved duct (3b) having different ventilation characteristics.

Therefore, considering only the field wind surface, if the radial ventilation duct 3a is eliminated and only the rim and duct 3b are used for ventilation, the above-mentioned loss will be minimized and the wind loss will be minimized.

However, as shown in Figure 1, in the conventional structure,
Since the radial ventilation duct 3a is supported by the radial ventilation duct 3a, it is necessary to provide the radial ventilation duct 3a, which reduces windage loss and makes the machine more efficient. Moreover, in order to provide a radial ventilation duct, it was necessary to manufacture and assemble the spacer 7, etc.

[Purpose of the invention]

The purpose of the present invention is to avoid the need for radial ventilation ducts.
To provide a cotrochanter'Jk for a rotating electric machine that can support the rim and generate less wind 4M.

[Summary of the invention]

In order to achieve the above object, the present invention provides a radial ventilation duct in which the inner diameter of a plurality of plates stacked on the rotor spokes is smaller than the inner diameter of the rotor spokes, thereby supporting the rim. The structure shall be free of

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 4 and 5.

In FIG. 5, 3 is a rim, which is made up of a conventional fan-shaped rim 6 and a new fan-shaped rim 8. f has been completed.

The fan-shaped rim 6 is also punched out in a circular shape on the inner periphery, and the HA-shaped rim 8 has a fan-shaped 9 mm punched out on the inner periphery.

A plurality of fan-shaped rims 8 are stacked on the upper side of the spoke lower plate 2C, as shown in the shaded area in Fig. S5. The rest are all stacked with conventional fan-shaped rims 6 (to form 9 rims 3, as shown in FIG. 4), and the part of the square rim 8 that corresponds to the key bar 4 is Make a notch using ``Tsuka'' ζ Nigas cut /, +,, -,. When punching out Noyorim 8 with a press, first cut the inner circumference (
Take a part of the 11jl cutting die and punch out the required number of sheets, then set the inner circumferential side cutting die and make the fan-shaped rim 6.''] Since the punching is good, the cutting die t:j is the same as before. 11) l! It hurts like that.

Since the trim 8 is not curved on the inside, it is shaped so that it rides on the lower spoke plate 2C. In other words, there is no need to provide other structures such as 4 for support, 4 different structures (for example, a wind duct) 3a, spacers 7 and stoppers 5 for forming the rim tact, etc.
C1. The rim 3 can be supported by simply stacking the shaped rim 8 on the spokes 1 and the plate 2C.

The part of the rim 3 where the M'r-shaped rim 8 is used may be a "2" cut on the spoke upper plate.

In such a rotor, f2 dial mass, dak)
Since the rim 3 can be held without installing the rim 3a, the windage loss that was increased due to the 1°77471tt loss and the shadow of the secondary flow of the perforation, etc. It is possible to provide a rotating electrical machine with low efficiency by significantly reducing the amount of heat generated.Also, since it would be a pain even if the radial ventilation duct) 3a is not installed,
The production and installation of the space f-7, which was conventionally required to configure the ventilation duct) 3a, is no longer necessary, and a rotating electric machine that is cheaper than the conventional one can be provided.

〔Effect of the invention〕

In the rotor of the present invention, a part of the inner periphery of the spoke lower plate 1 is placed, and the rim 3 can be supported without providing a ventilation duct 3a, so that eddy current loss that conventionally occurs in the ventilation duct 3a Since the windage loss caused by the effects of the secondary flow of air and turbulence can be greatly reduced, it is possible to provide a more effective rotating electric machine.

14. Brief explanation of the drawings Figure 1 is a vertical cross-sectional view of a conventional rotating electric machine, Figure 2 is a plan view showing the state of the rim of a conventional segment type, and Figure 3 is a diagram of a conventional segment type rim. - Side view, Figure 4 shows the condition of the segment type rim with the main side.
The L-side view and FIG. 5 are longitudinal sectional views of a rotor of a rotating electric machine according to an embodiment of the present invention.

1... Rotating shaft, 2... Spoke, 2C... Spoke lower plate, 3... Rim, 6.8...
- Fan-shaped rim plate.

Agent: Patent Attorney Nori Chika > ~, Yu (+: f or 1 person) Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Spokes provided radially from the rotating shaft and approximately fan-shaped island steel plates are laminated in an annular shape so that a portion of the inner diameter is smaller than the outer diameter of the Ail spoke, and this small inner diameter portion extends to the outer periphery of the spoke. Placed it on the rim and 1
1I'r:'H sign of rotating electric machine (monthly trochanter).