JPH0260456A - Superconducting rotating machine - Google Patents

Abstract

PURPOSE:To prevent the eccentric rotation of an apparatus by fitting the axial end of the hollow shaft of said apparatus with a balance ring. CONSTITUTION:The rotor 1 of a superconducting rotating machine is supported at both ends by bearings 2 to rotate. Said rotor 1 is hollow inside and supplied with a refrigerant from the center of rotation of one end 1a of a shaft. For that purpose, said rotor is equipped with a refrigerant supply pipe 10, a conducting pipe 20 for introducing the refrigerant after cooling, and a liquid coupling 30. Also, said rotor has a slip ring 3 supplying an exciting power and a heat insulating flange 4. In this case, a balance ring 50 is provided in said liquid coupling 30. Said ring 50 is slender, has a thin-walled double pipe structure, and its mass can affect the moment of inertia of said shaft end 1a so constituted as to be comparatively distant from the center of said rotor. Thus, said superconducting rotating machine having the balance ring 50 increases in the moment of inertia at the shaft end supplying the refrigerant to decrease in the eccentric rotation.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is characterized in that the rotor is constructed using superconducting wire,
It relates to a superconducting rotating electric machine in which the superconducting wire is cooled, and more specifically, a liquid cup for supplying and discharging a cooling refrigerant configured at the end of a hollow shaft as a rotor of the superconducting rotating electric machine. It concerns a ring structure.

[Conventional technology]

Conventionally, the rotor of a superconducting rotating electrical machine has a
A so-called liquid transfer coupling (hereinafter simply referred to as a liquid coupling) is provided that supplies a cooling refrigerant and leads out the cooled refrigerant. Conventionally, this liquid coupling has been described by IE1~Lanzaktion, on Magnetics MneG19. Number 3. (1983) pp. 529-5
32 pages (IE3Trans, Magnetics, M
AG]9. Nn3 (1983) PP.

529-532), specific examples are introduced.

[Problem to be solved by the invention]

By the way, it is necessary to suppress the shaft runout as much as possible in the hollow shaft end where the cooling refrigerant supply and discharge means, commonly known as a liquid coupling, of this type of superconducting rotating electrical machine is constructed. Figure 7(a)-(
Explain the reason according to d).

The rotor 1 is supported by bearings 2 at both ends and performs a rotational movement of about 3000 revolutions per minute. At this time, if there is a mass imbalance in the circumferential direction of the rotor 1, (b ), (C) such eccentric rotations occur. Normally, balance adjustment is performed during manufacturing to prevent this eccentric rotation.

By the way, the method of supplying the refrigerant into the hollow interior of the rotor 1 is carried out from one shaft end 1a of the rotor 1.
As is clear from the prior art described above, this configuration is achieved by inserting a refrigerant supply pipe through a hole drilled at the center of rotation of the shaft end 1a and passing the refrigerant through the hole. At this time, the hole and
It is effective to make the gap between the pipes as narrow as possible in order to reduce leakage of the supplied refrigerant. However, in reality, due to the aforementioned shaft runout, the rotating shaft end 1a,
In order to prevent the fixed refrigerant supply pipes 10 from touching each other, the gap between them had to be made large.

In addition, FIG. 1(d) shows that even if the bias of the rotor 1 is adjusted, as the distance from the bearing 2 to the shaft end 1a increases, eccentric rotation of the shaft end 1a occurs in proportion to the distance. This is what is illustrated.

The present invention aims to prevent such eccentric rotation at the shaft end.

[Means to solve the problem]

In order to achieve the above object, in the superconducting rotating electrical machine of the present invention, a mass capable of maintaining the balance of the hollow shaft is provided at the axial end of the hollow shaft on the side where the supply pipe for supplying the refrigerant is inserted. It is equipped with a balance ring that has a

Further, the above-mentioned balance ring is attached using spokes as a means for attaching it.

Moreover, the shape of the balance ring described in "-" is made into a cylindrical shape, and the cylindrical balance ring is attached at the center of the bottom part.

Furthermore, the inner surface of the cover that covers the outer periphery of the balance ring,
A magnetic coupling mechanism is incorporated so that the outer peripheral surfaces of the balance ring interact magnetically with each other.

[Function] A superconducting rotating electric machine having a balance ring configured as described above has a large moment of inertia at the end of the shaft that supplies the refrigerant, so it can exhibit the effect of reducing eccentric rotation.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a schematic representation of a rotor 1 of a superconducting rotating electric machine. The rotor is supported at both ends by bearings 2 and rotates.

The rotor 1 is hollow inside, and refrigerant is supplied from the center of rotation at one end 1a of the shaft. 10 is a refrigerant supply pipe, 20 is inside the rotor 1,
The pipe 30 through which the cooled coolant is led out is a liquid coupling of the present invention, which will be described later.

In addition, 3 is a slip ring that supplies power for excitation,
4 is a heat insulating flange.

The balance ring 50 of the present invention is configured within the liquid coupling 30 described above.

FIG. 2 is an embodiment of the present invention. The inside of the shaft end 1a has a double pipe structure, and a refrigerant supply pipe 10 is inserted into the innermost diameter ]b up to the vicinity of the center of the rotor 1. The supply pipe 1o is supported and fixed 11 by a cantilever principle to a cover 35 that forms the outer shape of the liquid coupling, and does not rotate. It goes without saying that the shaft end 1a rotates. The shaft end 1a has a shaft end 1b into which the supply pipe 10 is inserted.
An independent path 1c is formed on the outer diameter portion of the rotor 1 to lead out the cooled coolant from near the center of the rotor 1, and the diameter portion 1c is connected to the backing 32 at the inner diameter portion of the cover 35. It is discharged into a partitioned chamber 31 and directed to a conduit 20 for recycling.

Arrows indicate refrigerant paths.

In the present invention, a balance ring 50 is provided at the shaft end 1a in the above structure.

This balance ring 50 is thin and has a thin double-tube structure, and has a mass capable of acting on the moment of inertia of the shaft end 1a, which is configured to be relatively far from the rotor center. The balance ring 50 may have a structure as described below.

In FIG. 4, a disc-shaped balance ring 50 is integrally formed on the shaft end "a" by cutting or welding. Such a configuration may eliminate the need for adjusting the rotational balance of the balance ring 5o, and is also an extremely simple configuration means. In FIG. 5, a ring portion 51 with mass is fixed to the shaft end 1a using a connector having a length adjustment function such as spokes 52.

With such a configuration, the balance of the balance ring can be adjusted by adjusting the length of the spokes 52.

In FIG. 6, the balance ring 50 has a cylindrical configuration and is fixed to the shaft end 1a at the center of the bottom of the cylinder. Such a configuration is similar to that shown in FIG. 5, but the moment of inertia 1 can be increased. In addition, when configuring a mechanism for discharging cooled refrigerant gas, it becomes possible to install the supply pipe 20 and the discharge pipe 20 from the same axial direction, so that the supply and discharge of the refrigerant can be performed from the cylindrical shape as shown by the arrow. It can be configured by utilizing the shape, such as the configuration of the backing 32 and the liquid coupling 30.
It may also be easier to configure.

Finally, the embodiment shown in FIG. 3 will be explained.

FIG. 3 shows a balance ring incorporating a magnetic coupling mechanism as a means for increasing the mass of the balance ring. That is, a non-contact magnetic coupling mechanism that magnetically repels or attracts the outer circumferential portion 53 of the balance ring 50 and the inner diameter portion 33 of the cover 35 of the liquid coupling 30 opposing the outer circumferential portion 53. By incorporating
The moment of inertia of the balance ring 50 can be increased.

〔Effect of the invention〕

According to the rotor of a superconducting rotating electric machine having the balance ring of the present invention described above, the eccentric rotation of the shaft end that supplies the cooling refrigerant can be reduced, so that the difference in the outer diameter and inner diameter between the refrigerant supply pipe and the shaft can be reduced. can be set small.

This reduces backflow leakage of the supplied refrigerant, making it possible to improve cooling efficiency.

Furthermore, since the eccentric rotation width is reduced, there is no contact between the refrigerant supply pipe and the inner diameter of the rotor shaft, so it is possible to make the refrigerant supply pipe thinner. This can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the outer shape of a rotor having a balance ring of the present invention, FIGS. 2 to 6 are illustrations of an embodiment of the liquid coupling part and balance ring of the present invention, and FIG. , is a diagram for explaining the principle of eccentric rotation in a conventional rotor. 1. Rotor of superconducting rotating electrical machine, 2. Bearing, 10. Refrigerant supply pipe, 20. Refrigerant outlet, 30 Liquid coupling, 50. Balance ring.

Claims (1)

[Scope of Claims] 1. A stator having an armature winding, a rotor wound with superconducting wire that has a shaft within the stator and can rotate, and a shaft end of the rotor. a liquid coupling formed in a portion of the rotor that supplies a refrigerant to the inside of the rotor to cool the superconducting windings and then discharges the refrigerant to the outside of the rotor; A superconducting rotating electric machine characterized in that a balance ring is attached to an end portion of the side having the liquid coupling. 2. Supplying a refrigerant into the hollow shaft of the superconducting rotating electric machine from its axial end, cooling the superconducting wire wound around the hollow shaft with the refrigerant, and discharging the cooled refrigerant. A superconducting rotating electrical machine having a liquid coupling that can be discharged from an axial end of the hollow shaft, characterized in that a balance ring is provided at the axial end of the hollow shaft having the liquid coupling. A superconducting rotating electrical machine. 3. The superconducting rotating electric machine according to claim 1 or 2, wherein the balance ring is fixed to the axial end of the hollow shaft using spokes. 4. The superconducting rotating electric machine according to claim 1 or 2, wherein the balance ring has a cylindrical shape and is fixed to the axial end of the hollow shaft with the axes of the cylindrical shape aligned. 5. Claims 1 to 4 in which a non-contact magnetic coupling mechanism that magnetically acts on each other is incorporated in the opposing surface portions of the outer periphery of the balance ring and the cover of the liquid coupling that covers the balance ring. The superconducting rotating electrical machine described. 6. A stator having an armature winding, a rotor wound with a superconducting wire that has a shaft within the stator and can rotate, and a shaft end portion of the rotor with a rotor inside the rotor. A superconducting rotating electrical machine comprising: a refrigerant supply/discharge means capable of supplying a refrigerant to cool the superconducting windings and then discharging the refrigerant to the outside of the rotor, at a shaft end portion of the rotor; A superconducting rotating electric machine, characterized in that a balance ring is attached to the side having the refrigerant supply/discharge means.