JPH0119579Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a salient pole rotor for a rotating electrical machine that reduces windage loss.

[Technical background of the invention and its problems]

In the field of rotating electric machines, especially water turbine generators, machines with large capacities and large diameters have been developed; for example, machines with rotor outer diameters of 12 to 14 m and circumferential speeds of 70 to 80 m/s have appeared. . As the diameter of the rotor increases and the circumferential speed increases, the resulting windage loss increases, especially if there are protrusions on the surface of the disk spokes that support the magnetic pole attachment yoke. Windage loss is proportional to the projected area of a protrusion on a plane perpendicular to the ventilation direction,
Also, it is proportional to the cube of the circumferential speed. For example, as shown in FIG. 1, in a conventional water turbine generator of the radial ventilation type that employs umbrella-shaped disc spokes 1 that extend upward from a bearing (not shown), the field winding of the magnetic pole 2 runs from the collector ring 5. The outlet connecting conductor 1 (in this case, a copper strip is used) connected to the wire 3 is connected to the collector ring 5, the collector shaft 6 attached to the upper part of the rotating shaft 12, the upper surface of the upper annular plate 7 of the disc spoke 1, It was attached along the top surface of the yoke 8. This connecting conductor 4 is fixed via a mounting seat 9 with a hexagonal bolt (not shown). However, as mentioned above, as the diameter of the rotor becomes larger, the structure in which the connecting conductor 4 is fixed to the upper surface of the upper annular plate 7 of the disc spoke 1,
The projected area of the connecting conductor 4, the mounting seat 7, and other protrusions on a plane perpendicular to the ventilation direction is large, and the effect of these protrusions agitating stationary air has resulted in an increase in windage loss.

[Purpose of invention]

An object of the present invention is to provide a salient pole rotor for a rotating electrical machine that reduces windage loss caused by agitating the air by connecting conductors and mounting seats.

[Summary of the idea]

In this invention, by arranging the connecting conductor for the outlet of the field winding of the magnetic pole from the collector ring through the inside of the disc spoke, the air inside the disc spoke can be guided by the vanes and flow in the radial direction. This reduces the windage loss by reducing the projected area of the outlet connection conductor and the mounting seat with respect to the plane perpendicular to the ventilation direction, thereby reducing the resistance to air flow.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described with reference to FIG. The disc spoke 1 has an upper annular plate 7 and a lower annular plate 10 arranged parallel to each other with an interval in the axial direction, and vane plates 11 are arranged radially between both 7 and 10, and both 7 and 10 are arranged as vane plates. 11 (by welding), and is attached to a rotating shaft 12. A salient magnetic pole 2 is attached to the outer periphery of the disk spoke 1 via a yoke 8 having a ventilation duct 13. The outlet connection conductor 4 connected from the collector ring 5 to the field winding 3 of the magnetic pole 2 descends from the collector ring 5 along the collector shaft 6 attached to the upper end of the rotating shaft 12, and is connected to the upper surface of the lower annular plate 10. In other words, it is disposed along the disk spoke 1, passing through it in the radial direction. Then, it rises on the inner peripheral surface of the yoke 8,
It passes through the upper annular plate 7 and connects to the field winding 3 along the upper surface of the yoke 8. The connecting conductor 4 is connected to the collector shaft 6, the lower annular plate 10, and the yoke 8 using hexagonal bolts (not shown) through mounting seats 9 provided at appropriate intervals.
Insulate and fix.

Next, the effect will be explained.

The portion where the outlet connection conductor 4 is disposed long in the radial direction is inside the disc spoke 1. Air flowing inside the disc spoke 1 passes through a radial ventilation path because of the vane plate 11. Connecting conductor 4 for outlet inside disc spoke 1 and mounting seat 9
Since the projected area on the plane perpendicular to the ventilation direction is small, the windage loss in this part is extremely small. This effect is extremely noticeable in large diameter machines. Therefore, a salient pole rotor for a rotating electric machine with reduced windage loss can be obtained.

As another embodiment, the outlet connecting conductor 4 may be attached to the lower surface of the upper annular plate 7 as shown in FIG. 3, and the other embodiments may be as shown in FIG. As shown in FIG. 4, the outlet connection conductor 4 may be attached along the side surface of the vane plate 11, and the rest may be the same as in the embodiment shown in FIG.

In any case, since the outlet connecting conductor 4 is disposed through the inside of the disk spoke 1, the same effect as the embodiment shown in FIG. 2 can be obtained.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can of course be implemented with various modifications without changing the gist thereof.

[Effect of idea]

As explained above, according to the present invention, by arranging the outlet connection conductor through the inside of the disc spoke, the windage loss caused by the outlet connection conductor and the mounting seat etc. can be greatly reduced. A salient pole rotor for a rotating electric machine can be provided.

[Brief explanation of the drawing]

FIG. 1 is a right half vertical cross-sectional view showing a conventional salient pole rotor, and FIGS. 2 to 4 are right half vertical cross sections showing different embodiments of the salient pole rotor of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1... Disc spoke, 2... Magnetic pole, 3... Field winding, 4... Connecting conductor for outlet, 7... Upper annular plate, 8... Yoke, 10... Lower annular plate, 11 ……
Feather board.

Claims (1)

[Scope of utility model registration request] Two annular plates are arranged parallel to each other with an interval in the axial direction, blade plates are arranged radially between them, and the joined disk spoke is attached to the rotating shaft, and a ventilation passage is created inside the disk spoke. In a salient pole type rotor in which this ventilation passage is oriented in the radial direction by the vane plate and salient pole type magnetic poles are provided on the outer periphery of the rotor through a yoke, the collector ring is connected to the field winding of the magnetic pole. A salient pole type rotor, characterized in that an outlet connection conductor is disposed through the inside of the disc spoke.