JPS6223364A - Manufacture of superconducting rotor - Google Patents

Abstract

PURPOSE:To stabilize quality and improve output, by using no wedges, and by fixing superconducting windings firmly with keep plates in grooves. CONSTITUTION:So far as an external cylinder 1 for the cold shield of a superconducting rotor is concerned, the one end is fixed on a driving side shaft 2a, and the other end is fixed on a counter-driving side shaft 2b. Besides, on the both shafts 2, the external cylinder 1 and the torque tube 3 of a co-axial internal cylinder are fixed, and inside the tube 3, a superconducting rotor winding 5 is fixed via a supporting cylinder 4. Besides, outside the supporting cylinder 4, a plurality of grooves 7 are arranged, and superconducting windings 8 are fixed in the respective grooves 7. Between the torque tube 3 and the windings 8, the keep plates 11 of insulating substance are fitted on the opening sections of the grooves 7. By winding up the keep plates 11 with heat-shrinking tapes and heating and shrinking them, the keep plates 11 are tightened on the superconducting windings 8, to be molded. Then, the superconducting windings 8 can be kept by the specified face pressure of the keep plates 11 against an electromagnetic force and a centrifugal force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a superconducting rotor for a rotating electrical machine, in which superconducting windings are fixed in grooves of a support cylinder.

[Technical background of the invention and its problems]

Conventionally, there was a superconducting rotor (e.g. Japanese Patent Application Laid-Open No. 122363/1983) in which the superconducting winding was placed in a groove in a support cylinder and a wedge was driven into the opening of the groove to fix the superconducting winding. , a wedge that presses the superconducting winding into the groove;
There was a problem in that the dimensions of the superconducting windings, grooves, etc. had to be matched to each other.

In particular, when superconducting windings are heated and molded in grooves, there is a problem in that the dimensions of the wedges must be adjusted or fillers must be added to match the dimensional changes caused by the molding.

There is also the problem of lowering the space factor of the superconducting winding in order to secure the area occupied by the wedge. [Objective of the Invention] The present invention is to fix the superconducting winding in the groove without using a wedge. This eliminates complicated dimensional adjustment work.

By stabilizing the quality and increasing the space factor of the superconducting winding,
The purpose of the present invention is to provide a method for manufacturing a superconducting rotor with improved output.

[Summary of the invention]

In the present invention, in a method for manufacturing a superconducting rotor in which a superconducting winding is placed in a groove provided in a support tube and then the support tube is fixed inside a cylindrical torque tube, the superconducting winding placed in the groove is Then, from the opening of the groove, a presser plate having a cutout on the outer surface is applied, and the heat-shrinkable tape is wrapped around the superconducting winding through the presser plate so that it enters the cutout, and the heat-shrinkable tape is shrunk by heating. At the same time as tightening the holding plate with The space factor of the superconducting winding is increased by eliminating the need for shape changes or dimensional adjustments using stuffing, etc., and by occupying the portion where the wedge is removed with the superconducting winding via a thin holding plate.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In FIG. 1, ``■'' is an outer cylinder that serves as a room temperature shield, and one end of the outer cylinder ``■'' is fixed to the drive side shaft (2a), and the other end is fixed to the non-drive side shaft (2b). Furthermore, an outer tube ■ and a coaxial inner tube torque tube ■ are fixed to both shafts (2a) and (2b). Fix the () to the support tube inside the torque tube ■, and attach the () to the support tube
The superconducting rotor winding ■ is fixed to. A pipe 0 through which liquid helium passes from the non-drive side shaft (2b) is introduced into the inside of the support cylinder (2b). Outer cylinder ■ and both shafts (2aL (
2b) and the support tube) and pipe 0 are hermetically sealed.

Outer cylinder ■, both shafts (2a), (2b), support cylinder)
, pipe (e) is vacuum insulated.

FIG. 2 is a cross-sectional view of the torque tube (1) and its interior. ■ indicates multiple grooves provided on the outside of the support tube (), forming parallel saddle-shaped rings. Each groove has a superconducting winding (to)
is fixed, and the assembly of the superconducting groove windings 1a (c) is the superconducting rotor winding ■. Furthermore, between the support tube (A) and the superconducting winding (2), side insulation (2) is attached to both sides of the groove (2), and a bottom insulation (10) is attached to the bottom of the groove (2). A holding plate (11) made of an insulating material is attached to the opening of the groove (■) between the torque tube (■) and the superconducting winding (■).

As shown in FIGS. 3 and 4, notches (13a) and (13b) are provided at appropriate pitches on the outer circumferential side of the support tube (A) and on the outer circumferential side of the presser plate (11). Heat-shrinkable tape (1
2) Wrap around. Next, heat treatment is performed to shrink the heat-shrinkable tape (12), and the presser plate (11) is attached to the superconducting winding.
Tighten and mold.

Next, the part protruding from the groove (■) of the presser plate (11).

Simultaneously cut the outer peripheral surface of the support tube ■ with a lathe, and
) and the support cylinder) are aligned to one plane (a plane passing through the 11 X n tt X tt line in FIG. 4).

Next, the torque tube (1) explained in Figures 1 and 2 is shrink-fitted onto the outer peripheral surface of the support tube (2), and the presser plate (11) is fixed between the torque tube (3) and the superconducting winding (3). do.

Next, the effect will be explained.

The torque tube (2) transmits torque between the driving shaft (2a) and the support tube (A) that supports the superconducting rotor winding (2). Side insulation 0. The bottom insulation (1o) is the support tube (a)
The holding plate (11) provides electrical insulation between the torque tube ■ and the super electric groove winding IIA (a), and the groove ■ provides electrical insulation between the torque tube ■ and the super electric groove winding IIA (a). 0 and bottom insulation, (10) supporting the superconducting winding ■.

The holding plate (11) molds and holds the superconducting winding (marked in the groove 2) by the contraction force of the heat-shrinkable tape (12).

During molding, the holding plate (11) moves inward from the opening of the groove (2) in accordance with the contraction of the superconducting groove (1). Notch (
13a) and (13b) are wrapped heat-shrinkable tapes (12
) to prevent the outer diameter from being cut.
It goes without saying that the diameter should be smaller than the diameter of the plane passing through the line xx in the figure. Align the outer circumferential surfaces of the support tube () and the presser plate (11) by cutting, and attach the torque tube ■ to the support tube and the presser plate (11).
11) Shrink fit. Holding plate (11) after tightening with heat shrink tape (12) and shrink-fitting torque tube ■
prevents the super electric groove winding S■ from moving within the groove ■ against electromagnetic force and centrifugal force.

Next, the effects of this embodiment will be explained.

When heated and molded, the holding plate (11) becomes the superconducting winding (8)
Since the superconducting winding 0 is moved and fixed in accordance with the contraction of the superconducting wire 0, it is possible to hold down the superconducting winding 0 with a predetermined surface pressure against electromagnetic force and centrifugal force. The retainer plate (11) is cut to prevent it from loosening and the torque tube (■) is shrink-fitted, so the shrink-fitting allowance for the retainer plate (11) and the support tube () are equal.

Similarly to the support tube (4), the presser plate (11) can be firmly fixed.

Therefore, the superconducting winding (2) can be firmly fixed in the groove (2) using the holding plate (11) without using a wedge.

Next, another embodiment will be described with reference to FIG.

A spacer (15) is spirally wound around a superconducting wire (14), and this is wound multiple times to form a superconducting winding (c).

(1, 6a) are torque tube ■ and heat shrink tape (1
This is the first cooling channel that runs in the circumferential direction of the support tube (A) in the gap between the support tube (A) and the support tube (A). (16b) is a groove provided on the torque tube (1) side of the holding plate (11), which is a second cooling channel that runs in the axial direction. (16c) is the presser plate (11
) are the third radially extending cooling channels. (16d) is a plurality of grooves provided on the superconducting winding (8) side of the holding plate (11), and is a fourth cooling channel passing in the circumferential direction. (16s) is a side break 1! A plurality of grooves provided on the superconducting winding (c) side of #■ are the fifth cooling channel passing in the radial direction. (16f) is a gap created between adjacent superconducting wires (14) by spacers (5), and is a sixth cooling channel that runs spirally around the superconducting wire (14). (16g) = (16h), (16i
) is the 7th section provided on the bottom insulation (10). 8th. 9th cooling channel, 4th . Third. The shape is similar to that of the second cooling channels (16d), (16c), and (16b). (16j) is the tenth cooling channel reaching the inside of the support cylinder). and each cooling channel (16a), (16b).

(16c), (16d), (・16e), (16
f), (16g), (16h).

(16i) and (16j) are continuous, and liquid helium flows from the first cooling channel (16a) to the tenth cooling channel (16j) (in the direction of the arrow in the figure).
The superconducting wire (14) is directly cooled.

As described above, even in a superconducting rotor in which liquid helium is guided into the inside of the superconducting winding (3) for direct cooling, the superconducting winding (3) can be fixed with the holding plate (11).

〔Effect of the invention〕

As explained above, according to the present invention, the configuration does not require complicated dimensional adjustment using wedges or padding, and the superconducting winding is held down by the holding plate, so the superconducting winding can be easily fixed. It is possible to stabilize quality, increase the space factor of the superconducting winding, and improve output.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional elevational view of the upper half of a superconducting rotor manufactured by an embodiment of the method of the present invention, and FIG.
3 is a perspective view of the main part of Fig. 2, Fig. 4 is a longitudinal sectional view of the main part of Fig. 2, and Fig. 5 is a superconducting rotor manufactured in another example. FIG. 3 is a cross-sectional view showing the main part of the groove section cut at different positions on the left and right sides of the groove section. 1...Outer tube 2a, 2b...Shaft 3...Torque tube 4...Support tube 5...Superconducting rotor winding 6...Pipe 7...Groove
8... Superconducting winding 11... Holding plate
12... Heat shrinkable tape 13... Notch part
14...Superconducting wire 15...Spacer
16a-16j...Cooling Channel Agent Patent Attorney
Inoue - Male Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] In a method for manufacturing a superconducting rotor in which a superconducting winding is placed in a groove provided in a support tube and then the support tube is fixed inside a cylindrical torque tube, the opening of the groove is placed above the superconducting winding placed in the groove. A presser plate having a notch on the outer surface is applied from above, and the heat-shrinkable tape is wrapped around the superconducting winding through the presser plate so that it enters the notch, and the presser plate is tightened by contraction of the heat-shrinkable tape due to heating. Also, a method for manufacturing a superconducting rotor, which comprises molding superconducting windings, cutting the outer peripheral surfaces of a support tube and a presser plate into a cylindrical shape, and shrink-fitting a torque tube to the support tube and presser plate.