JPH04229070A - Superconductive rotor and fixing method for its coil - Google Patents

Abstract

PURPOSE:To obtain a stable superconductive state capable of accurately and uniformly giving a predetermined residual compressive load to a superconductive field coil by providing gaps at both the shoulder portions of a fixed member along the axial direction of a coil mounting shaft and inserting packings to the gaps from the end portion of said coil mounting shaft. CONSTITUTION:A fixed member 16 can be inserted from a level difference portion formed at the end portion of a coil mounting shaft 1 to a slot 5, and gaps 17 are formed with the inner face of the slot 5 along the axial direction of the mounting shaft 1 at the shoulder portions at both the sides of the fixed member 16. Wedges 18 and 19 are inserted from both the end sides of the coil mounting shaft 1 to the gaps 17, and a residual compressive load is given to the superconductive field coil 6 by these wedges 18 and 19. Therefore, no load will be locally concentrated even if there is a dimensional error at the slot 5 or the fixed member 16, thereby uniformly and accurately giving a predetermined residual compressive load to the superconductive field coil 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting rotor, and more particularly to a structure and method for fixing a superconducting field coil.

0002

2. Description of the Related Art A superconducting rotor used in a superconducting rotating electrical machine includes a coil mounting shaft 1, a rotating shaft 3 connected to both ends of the coil mounting shaft 1 via a torque tube 2, as shown in FIG. It is composed of 4. On the outer circumferential surface of the coil mounting shaft 1, as shown in FIG. It is stored.

These superconducting field coils 6 are formed by winding a superconducting wire inside the slot 5, and a helium storage portion 7 is provided at the center of the coil mounting shaft 1. This helium storage section 7 communicates with each slot 5 via a helium channel 8, and the superconducting field coil 6 is cooled to an extremely low temperature with liquid helium stored in the helium storage section 7 to maintain a superconducting state. are doing.

A thermal duplication shield 9 for preventing heat from entering from the outside is provided on the outer periphery of the coil mounting shaft 1, and a low temperature damper 10 and a normal temperature damper 11 are provided concentrically outside the shield.

By the way, in the superconducting rotor constructed as described above, when the superconducting field coil 6 housed in the slot 5 moves within the slot 5 due to centrifugal force or electromagnetic force, the coil mounting shaft 1 and Superconducting coil 6 due to frictional heat
The superconducting field coil 6 is required to be firmly fixed in the slot 5 because the superconducting field coil 6 is transferred from a superconducting state to a normal conducting state and cannot maintain its function as a superconducting rotor.

FIG. 9 is a diagram showing a conventional fixing structure of a superconducting field coil 6. As shown in the figure, a side spacer 12, a lower spacer 14, and an upper spacer 13 are provided in the slot 5 to restrict the movement of the superconducting field coil 6. The side spacer 12 restricts the movement of the superconducting field coil 6 in the width direction of the slot 5, and is inserted between both sides of the superconducting field coil 6 and the corresponding inner surface of the slot 5. .

Further, the lower spacer 14 and the upper spacer 13 restrict the movement of the superconducting field coil 6 in the depth direction of the slot 5, and the upper spacer 1
A fixing member 16 is provided above 3 with a liner 15 for size adjustment interposed therebetween. This fixing member 16 is for applying a compressive load to the superconducting field coil 6, and is inserted into the slot 5 from a step (not shown) formed at the end of the coil mounting shaft 1. ing.

[0008]

By the way, according to the above structure, since the fixing member 16 is inserted into the slot 5 from the end of the coil mounting shaft 1, it is difficult to insert the superconducting field coil 6 into the slot 5. When fixing, after fixing the side part of the superconducting field coil 6 with the side spacer 12, a plurality of tapered upper spacers 13 are combined, and the fixing member 16
and the superconducting field coil 6, or when inserting the fixing member 16 into the slot 5 from the end of the coil mounting shaft 1, press the superconducting field coil 6 through the liner 15 whose thickness has been adjusted. At the same time, the fixing member 16 was driven in.

However, with such conventional means for fixing the superconducting field coil 6, it has not been possible to assemble the superconducting field coil 6 while leaving a strong and sufficient compressive force. In addition, conventionally, if there is a dimensional error in the slot 5 or the fixing member 16, it becomes impossible to apply a compressive load evenly to the superconducting field coil 6, which causes distortion in the superconducting wire, making it impossible to obtain a stable superconducting state. There was also.

The present invention was made in view of these problems, and its purpose is to accurately and evenly apply a predetermined residual compressive load to a superconducting field coil, and to maintain a stable superconducting state. It is an object of the present invention to provide a superconducting rotor that can be obtained and a method for fixing its coils.

[0011]

[Means for Solving the Problems] In order to achieve the above object, the present invention inserts a superconducting field coil into a slot formed on the outer peripheral surface of a coil mounting shaft, and the side part of this superconducting field coil is In a superconducting rotor that is fixed by side spacers and whose upper part is fixed by a fixing member inserted into a slot from the end of the coil mounting shaft, a gap is formed at both shoulders of the fixing member in the axial direction of the coil mounting shaft. , and a pawl is inserted into the gap from the end of the coil mounting shaft.

[0012] Further, in the present invention, a superconducting field coil is inserted into a slot formed on the outer peripheral surface of a coil mounting shaft, a side spacer is inserted between the inner surface of the slot and the superconducting field coil, and then a fixing member is inserted. is inserted into the slot from the end of the coil mounting shaft, and then pressurizes the superconducting field coil from the outer circumferential side to the inner circumferential side via this fixing member, and at this time, the superconducting field coil is pressurized from the outer circumferential side to the inner circumferential side through this fixing member. A clamp is inserted into the gap from both sides of the coil mounting shaft, and then the pressure on the superconducting field winding is released to fix the superconducting field winding.

[0013]

[Operation] In a superconducting rotor having such a configuration, gaps are provided on both shoulders of the fixed member along the axial direction of the coil mounting shaft, and a plug is inserted into the gap from the end of the coil mounting shaft. By inserting the fixing member, the fixing member is pressurized in the depth direction of the slot, so a predetermined strong residual compressive load can be accurately and evenly applied to the superconducting field coil, resulting in a stable superconducting state. be able to.

Further, the superconducting field coil is fixed while being pressurized from the outer circumferential side to the inner circumferential side via a fixing member inserted into the slot from the end of the coil mounting shaft. By inserting a filler into the gap formed on both sides of the member, it is possible to leave a compressive load even after the pressurization is released, thereby giving the superconducting field coil a predetermined necessary residual compressive load. I can do it.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the fixing structure of the superconducting field coil 6, and FIG. 2 is a sectional view taken along line A--A in FIG. In this embodiment, similar to the conventional example shown in FIG.
A side spacer 12 , a lower spacer 14 , and an upper spacer 13 are provided in the slot 5 to restrict the movement of the superconducting field coil 6 . It has a structure in which the upper part is fixed by a fixing member 16 via an upper spacer 13 and a liner 15 for size adjustment.

The fixing member 16 is inserted into the slot 5 from a stepped portion (not shown) formed at the end of the coil mounting shaft 1, and slots are provided at both shoulder portions of the fixing member 16. A gap 17 is formed along the axial direction of the coil mounting shaft 1 between the coil mounting shaft 1 and the inner surface of the coil mounting shaft 1 . Wedges 18 and 19 are inserted into this gap 17 from both ends of the coil mounting shaft 1, and these wedges 18 and 19 apply a residual compressive load to the superconducting field coil 6.

In the above configuration, when fixing the superconducting field coil 6 in the slot 5, the superconducting field coil 6 is first housed in the slot 5, and the inner surface of the slot 5 and the superconducting field coil 6 are connected. A side spacer 12 is inserted between them. Next, an upper spacer 13 is placed on top of the superconducting field coil 6, and a plurality of liners 15 are placed on top of the upper spacer 13, and then a fixing member 16 is inserted into the slot 5 from the stepped portion formed at the end of the coil mounting shaft 1. Insert inside. Thereafter, wedges 18 are inserted into the gaps 17 formed on both side shoulders of the fixing member 16.
, 19 are inserted from both ends of the coil mounting shaft 1, the fixing member 16 sinks in the depth direction of the slot 5, and the liner 15
Then, the superconducting field coil 6 is pressurized via the upper spacer 13.

Therefore, in the embodiment described above, when the superconducting field coil 6 is fixed in the slot 5, the necessary compressive load can be left even after the press is removed, and the superconducting field coil 6 can be fixed to the predetermined required amount. Compressive loads can be applied accurately. Further, even if there is a dimensional error in the slot 5 or the fixing member 16, the load will not be locally concentrated, and a predetermined residual compressive load can be applied to the superconducting field coil 6 evenly and accurately. In addition, in the above embodiment, the fixing member 1
Two wedges 1 are inserted into the gap 17 formed on both side shoulders of 6.
8 and 19 from both ends of the coil mounting shaft 1 to apply a compressive load to the superconducting field coil 6. However, both shoulder surfaces of the fixing member 16 and the corresponding inner surfaces of the slots 5 are tapered. If the gap 17 is tapered, a predetermined compressive load can be applied evenly and accurately to the superconducting field coil 6 by inserting one wedge 20 into the gap 17 as shown in FIG. I can do it.

FIG. 4 is a sectional view showing the fixing structure of the superconducting field coil 6 in another embodiment of the present invention, and the same parts as in the embodiment shown in FIG. However, only the different parts will be described here.

In this embodiment, as shown in FIG. 4, in the gap 17 formed at both shoulder portions of the fixing member 16, there is provided a pawl 21 in which the inner surface of the slot and the corresponding surfaces of the fixing member 16 are respectively formed as flat surfaces. are inserted from both ends of the coil mounting shaft 1, and these claws 21 apply a residual compressive load to the superconducting field coil 6.

In the above configuration, when fixing the superconducting field coil 6 in the slot 5, the superconducting field coil 6 is first housed in the slot 5, and the inner surface of the slot 5 and the top of the superconducting field coil 6 are connected. A side spacer 12 is inserted in between. Next, an upper spacer 13 is placed on top of the superconducting field coil 6, and a plurality of liners 15 are placed on top of the upper spacer 13, and then a fixing member 16 is inserted into the slot 5 from the stepped portion formed at the end of the coil mounting shaft 1. Insert inside. Thereafter, the superconducting field coil 6 is pressurized with a predetermined load from the outer circumferential side toward the inner circumferential side via the fixing member 16 using a press machine, and then the gap 17 formed at both shoulders of the fixing member 16 is Insert the claws 21 from both sides of the coil mounting shaft 1. Further, the principle of the present invention will be explained with reference to FIGS. 5 and 6.

Generally, superconducting coils of rotating electric machines have low rigidity, and in order to obtain the necessary residual compressive load of superconducting field coil 6, superconducting field coil 6 is not shown in advance through fixing member 16 as shown in FIG. Pressurize with a press. In this case, as shown in FIG. 6, before inserting the cuff 21, the liner 15 is adjusted so that a predetermined insertion gap is obtained, and the cuff 21 is inserted. If the load of the press is then released, the necessary residual compressive load can be obtained after the load is released.

Therefore, in the above embodiment, when the superconducting field coil 6 is fixed in the slot 5, the necessary compressive load can be left even after the press is removed, and the superconducting field coil 6 can be fixed to the predetermined required amount. Compressive loads can be applied accurately. Further, even if there is a dimensional error in the slot 5 or the fixing member 16, the load will not be locally concentrated, and a predetermined residual compressive load can be applied to the superconducting field coil 6 evenly and accurately.

[0025]

Effects of the Invention As explained above, the present invention provides gaps along the axial direction of the coil mounting shaft at both shoulder portions of the fixing member that fixes the upper part of the superconducting field coil. Since the plug is inserted into the gap, a predetermined residual compressive load can be accurately and evenly applied to the superconducting field coil, and a stable superconducting state can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a fixing structure of a superconducting field coil in an embodiment of a superconducting rotor according to the present invention.

FIG. 2 is a sectional view taken along line A-A in FIG. 1;

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view of the inside of the slot for explaining the method of assembling the superconducting rotor in the same embodiment.

FIG. 6 is an enlarged cross-sectional view of section “B” in FIG. 3;

FIG. 7 is an axial cross-sectional view of a superconducting rotor.

FIG. 8 is a radial cross-sectional view showing a portion of the coil mounting shaft.

FIG. 9 is a cross-sectional view showing the fixing structure of a conventional superconducting field coil.

[Explanation of symbols]

1... Coil mounting shaft, 2... Torque tube, 3... Rotating shaft, 5... Slot, 6... Superconducting field coil, 7...
... Helium storage section, 8 ... Helium channel, 9 ... Heat radiation shield, 10 ... Low temperature damper, 12 ... Side spacer, 13 ... Upper spacer, 14 ... Lower spacer, 1
5...Liner, 16...Fixing member, 17...Gap part, 1
8, 19, 20...Wedge, 21...Tsukumono.

Claims (2)

[Claims] Claim 1: A superconducting field coil is inserted into a slot formed on the outer circumferential surface of a coil mounting shaft, the sides of this superconducting field coil are fixed with side spacers, and the upper part is attached to the end of the coil mounting shaft. In a superconducting rotor fixed by a fixing member inserted into a slot from above, a gap is provided at both shoulder portions of the fixing member along the axial direction of the coil mounting shaft, and the gap extends from the end of the coil mounting shaft to the end of the coil mounting shaft. A superconducting rotor characterized by having a tab inserted in its part. Claim 2: First, a superconducting field coil is inserted into a slot formed on the outer peripheral surface of the coil mounting shaft, a side spacer is inserted between the inner surface of the slot and the superconducting field coil, and then a fixing member is mounted to the coil. After inserting into the slot from the end of the shaft, the superconducting field coil is pressurized from the outer circumferential side to the inner circumferential side via this fixing member, and at this time, a gap is formed between the shoulders on both sides of the fixing member. A method for fixing a coil in a superconducting rotor, comprising inserting a clamp from both sides of a coil mounting shaft, and then releasing pressure on the superconducting field winding to fix the superconducting field winding.