JP2914769B2 - Superconducting rotating electric machine rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

 [Object of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a superconducting rotating electric machine, and more particularly to a rotor for a superconducting rotating electric machine having an improved slot shape formed on a winding mounting shaft.

[0002]

2. Description of the Related Art A so-called superconducting generator using a superconducting conductor as a rotating field winding has been developed. FIG. 5 is a perspective view showing an example of the rotor of such a superconducting generator, and FIG. 6 is a sectional view showing the inside of a slot in a straight portion of the rotor. Note that an end portion on the opposite side of the rotor is omitted. In FIGS. 5 and 6, the winding mounting shaft 1 includes a linear slot extending in the axial direction and an end slot extending continuously from the slot through the end corner slot. A superconducting winding 2 wound in a saddle shape and laminated is placed in the slot, and the upper and lower spacers 4 and 4 and a wedge 5 are used to radially extend the slot. It is fixed to. The circumferential direction of the superconducting conductor 2 is fixed by side spacers 6 and intermediate spacers 7. A liquid helium flow path 8 is formed in each spacer, and the superconducting conductor 2 is cooled to a predetermined temperature by flowing liquid helium through the liquid helium to maintain the superconducting state.

FIG. 7 shows a shape of a slot portion of an end corner portion. As shown in FIG. 7, the slot center 9 passes through the center line 10 of the winding attachment shaft and is perpendicular to the center line 10 of the winding attachment shaft, that is, a straight slot portion 11 always matching the radius of the winding attachment shaft. And a continuous curved surface is connected to the end slot portion 12. With such a slot shape, the slot side surface 13 of the end corner portion is formed.
Becomes a three-dimensional surface.

As is well known, when the superconducting conductor moves even a little, it changes from a superconducting state to a normal conducting state due to generation of heat. Therefore, it is important to suppress the movement of the superconducting conductor, that is, the so-called wire movement to prevent the normal conduction transition (quenching), in order to improve the stability of the superconducting device.

The superconducting conductor used in the rotor of the superconducting generator is subjected to a large current and is exposed to a high magnetic field. Therefore, a strong electromagnetic force is applied to the superconducting conductor, and the superconducting conductor is used in a high-speed rotating field. Large centrifugal force is applied. Therefore, in order to operate the superconducting generator stably, it is necessary to firmly fix the superconducting conductor exposed to electromagnetic force and centrifugal force so as not to move.

[0006] The superconducting conductor accommodated in the slot is supported and fixed by a spacer made of an insulator by a slot side surface, a slot bottom surface and a wedge at a straight portion, and by a slot side surface, a slot bottom surface and an end ring at an end portion. Is done. To firmly fix the superconducting conductor,
It is required that the spacer and the slot are in contact with no gap. Therefore, the shape of the spacer and the slot contact surface must be accurately processed so that the spacer and the slot are in close contact with each other. There is no particular problem when the surfaces of the spacer and the slot are flat, but since the end corners are curved, it is necessary to devise the shape.

[0007]

As described above, in the rotor of the conventional superconducting generator, the slot portion of the end corner portion is formed such that the slot center always coincides with the radial direction of the winding mounting shaft. Since the slot side surface 13 of the end portion is formed as a three-dimensional curved surface, as described above, in order for the spacer and the slot to be in contact with no gap, the slot contact surface of the spacer also has the same three-dimensional curved surface as the slot side surface. Must be processed. Therefore, 3
It is very difficult to process two-dimensional curved surfaces so that they contact each other without gaps. That is, there is a problem that a gap is formed between the slot receiving the force for fixing the superconducting conductor and the contact surface of the spacer, and the superconducting conductor cannot be firmly fixed.

An object of the present invention is to improve the workability of the slot and the spacer by forming the slot portion of the end corner portion with a simple surface, and to eliminate the gap between the spacer for fixing the superconducting conductor and the contact surface of the slot. It is an object of the present invention to provide a rotor of a superconducting rotary electric machine, in which a superconducting conductor can be firmly fixed by improving adhesion, and a stable operation that is hard to cause a normal conduction transition (quenching) can be performed. [Configuration of the Invention]

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a structure in which a winding attachment shaft extends radially in an axial direction.
From the slot of the straight section and the slot of this straight section.
And a slot at the end along the circumference.
A saddle-shaped slot is formed, and the superconducting field
In the rotor of the superconducting rotating electrical machine windings housed, before
Side of the slot at the corner connecting the straight part and the end
On the same plane as the axial end face of the slot portion of the straight portion.
Formed on the inner and outer cylindrical surfaces defined as the reference plane,
The bottom surface of the slot portion of the corner portion is formed on the cylindrical surface.
It is formed on a plane perpendicular to the plane .

[0010]

In the rotor of the superconducting rotary electric machine having such a configuration, the side surface of the slot portion of the end corner portion is formed in a cylindrical surface, and the bottom surface of the slot portion of the end corner portion is formed in a plane perpendicular to the side surface. Since it is formed, the shape of the slot portion of the end corner portion can be simplified, the processing of the slot and the spacer is facilitated, and the adhesion between the slot and the spacer can be improved.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a configuration example of a field winding end corner portion in a rotor of a superconducting rotary electric machine according to the present invention, and FIG. 2 is a view of FIG. 1 as viewed from the rotor axial direction. FIG. 3 is a view as viewed from the direction indicated by the arrow A in FIG.

As shown in FIGS. 1 to 3, the linear slot portion 11 and the end slot portion 12 are connected via a slot portion 14 of a field winding end corner portion.
The slot side surface 13 of the end corner portion is formed as a cylindrical surface, and the slot bottom surface 15 of the end corner portion is formed as a surface perpendicular to the slot side surface 13 of the end corner portion, that is, the bottom surface of the cylindrical surface.

With the above configuration, when the straight slot portion 11 and the end slot portion 12 have the same depth,
A step 17 is formed at the boundary between the bottom 15 of the slot at the end corner and the bottom 16 of the linear slot, and the bottom 15 of the slot at the corner is deeper than the bottom 16 of the linear slot. Since this step 17 can be corrected by devising the shape of the lower spacer, there is no problem in the superconducting conductor of the field winding.

As shown in FIG. 2, the slot bottom surface 15 of the end corner is formed as a plane perpendicular to the slot side surface 13 of the end corner which is a cylindrical surface. FIG.
As shown in the figure, the slot side surface 13 of the end corner portion is
It is formed by cylindrical surfaces of radii R1 and R2.

The slot side surface 1 of the end corner portion
If 3 is a cylindrical surface and the slot bottom surface 15 of the end corner is the bottom surface, it is not necessary to make the center positions of the radii R1 and R2 the same.

By making the side surface of the slot portion of the end corner portion a cylindrical surface and making the bottom surface of the slot portion a flat surface as in this embodiment, the processing of the slot and the spacer is facilitated and the close contact accuracy between the slot and the spacer is improved. I do. Therefore, the superconducting conductor can be firmly fixed, and the rotor of the superconducting rotating electric machine can be operated stably, in which normal conduction transition (quenching) is difficult. Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a view showing a slot shape in the rotor of the superconducting rotary electric machine, and is a view corresponding to FIG. 2 of the above-described embodiment. In FIG. 4, the linear slot 11 and the end slot 12 are connected by a slot side surface 13 of the end corner which is a cylindrical surface. In addition, the slot center 18 of the linear portion does not coincide with the radial direction 19 of the rotor cross section, and falls on the rotor pole center 20 side.

By doing so, the slot bottom surface 15 of the end corner portion and the linear slot bottom surface 16 can be matched at the same slot depth without any step, and the same operation and effect as described above can be obtained. .

[0020]

As described above, according to the present invention, the slot portion of the end corner portion is formed on a simple surface to improve the workability of the slot and the spacer, and the spacer and the slot for fixing the superconductor are fixed. Provided is a superconducting rotating electric machine rotor that can stably fix a superconducting conductor because it has improved adhesion by eliminating gaps in a contact surface, and thus can perform stable operation that is unlikely to undergo normal conduction transition (quench). it can.

[Brief description of the drawings]

FIG. 1 is an external view showing a slot shape of a field winding end corner in one embodiment of a rotor of a superconducting rotary electric machine according to the present invention.

FIG. 2 is a view of FIG. 1 as viewed from a rotor axis direction.

FIG. 3 is a view taken in the direction of arrow A in FIG. 2;

FIG. 4 is a diagram showing a slot shape of a field winding end corner in another embodiment of the rotor of the superconducting rotary electric machine according to the present invention.

FIG. 5 is a perspective view showing a rotor of a conventional superconducting rotary electric machine.

FIG. 6 is a sectional view showing the structure inside the rotor slot.

FIG. 7 is a view showing a shape of a slot portion of the end corner portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Winding mounting shaft, 2 ... Superconducting conductor, 3 ... Upper spacer, 4 ... Lower spacer, 5 ... Wedge, 6 ... Side spacer, 7 ... Intermediate spacer, 8 ... Helium flow path, 1
1 ... linear slot portion, 12 ... slot portion of end portion, 13 ... side surface of slot portion of end corner portion, 14 ...
... Slot portion at end corner portion, 15 ... Bottom surface of slot at end corner portion, 16 ... Bottom surface of linear slot portion, 1
8 ... linear slot center, 19 ... radial direction of rotor cross section, 20 ... rotor pole center.

Claims (1)

(57) [Claims] Claims: 1. An axial direction in which a winding mounting shaft is directed radially.
Along the straight section and the straight section
Continuous from the end slot along the circumference.
A saddle-shaped slot is formed.
In a rotor of a superconducting rotary electric machine in which a magnetic winding is accommodated, a slot portion side of a corner portion connecting the straight portion and the end portion
The surface should be on the same plane as the axial end face of the slot part of the linear part.
Formed on the inner and outer diameter cylindrical surface determined as the reference surface,
The bottom surface of the slot portion of the corner portion was formed on the cylindrical surface.
A rotor for a superconducting rotating electrical machine, wherein the rotor is formed on a plane perpendicular to a side surface .