JP3217531B2 - Superconducting rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting rotor in a superconducting rotating electric machine, and more particularly to a superconducting rotor having an improved arrangement of superconducting conductors constituting a superconducting field winding housed in a slot of a winding mounting shaft.

[0002]

2. Description of the Related Art As a conventional superconducting rotor having a superconducting field winding, there is one having a configuration as shown in FIG. FIG. 2 is a schematic cross-sectional view of the superconducting rotor. In FIG. 2, a field winding 1 made of a superconducting conductor is housed in a slot of a field winding mounting shaft 2 made of high-strength nonmagnetic steel, and is firmly fixed. Cooling passages are formed in the inner and outer peripheral portions of the field winding and the field winding. Through these cooling passages, the liquid helium reservoir and the field winding attaching shaft inside the field winding attaching shaft 2 are provided. The winding is cooled by circulating the liquid helium 3 in the liquid helium container 4 disposed on the outer peripheral portion of the coil 2. On the outer periphery of the liquid helium container 4, a vacuum heat insulating layer 5, a radiant heat shield 6, and a normal temperature damper 7 constituting the vacuum container are concentrically arranged. By the way, in the superconducting rotor having such a configuration, the field winding housed in the slot of the field winding attachment shaft 2 is configured as follows.

FIG. 3 is a view showing a conventional field winding for one slot. This field winding 1 is composed of a lower insulating spacer 8a, a side insulating spacer 8b and an intermediate insulating spacer 8c inserted in the slot. The superconducting conductor 9 is inserted in two rows and inserted, and the two rows of coils are wound simultaneously from the bottom of the slot by a double pancake method. The upper spacer 8d is inserted into the slot opening side. It is fixed by a wedge 10.

FIG. 4 is a schematic diagram showing the configuration of one pole of the field winding 1, and a superconducting conductor connecting portion 11 between the field coils.
Is provided on the coil end portion on the connection side. here,
In FIG. 4, 1a is a field winding linear portion, and 1b is a field winding end portion.

[0005] In the superconducting rotor having such a configuration, the magnetic flux density on the inner peripheral side of the end portion of the innermost coil of the field winding becomes highest, and a stable field winding without quench is obtained. For this purpose, the field current is determined based on the maximum current density at which the superconducting conductor does not quench in the high magnetic flux density portion. However, this has the problem that the current density of the superconducting conductor in the portion where the magnetic flux density is low has an excessive margin, and the capability of the superconducting conductor cannot be used effectively, and the performance of the field winding is reduced. .

Further, in the conventional superconducting rotor, the connection between the coils of the field winding is provided at the end, so that the length of the field winding becomes longer and the overall size of the superconducting rotor becomes larger. There's a problem.

Further, since there is no need to provide a connection portion at the coil end portion on which no connection between the coils is made, the length of the coil end portion does not increase. Therefore, there is a problem that the magnetic center position of the field winding becomes unclear. Of course, if the length of the coil end portion where connection is not made is the same as the connection side, the magnetic center position becomes clear, but in this case the field winding length becomes longer and the superconducting rotor Causes an increase in size.

[0008] Regarding this, there is a method in which the connection between the coils is made in a slot, but there is a method in which a field current is suddenly changed like a field winding of a superconducting rotor used in a super-speed superconducting generator. In such a case, since a large voltage is generated between the rows and the ground in the slot, there is a problem that if the connection is made between the coils in the slot, the connection cannot be sufficiently insulated.

[0009]

As described above, in the conventional superconducting rotor, the field current density of the field winding is limited by the maximum current density at which the superconducting conductor in the high magnetic flux density portion does not quench. There is a problem that the performance when the winding is used is lower than the performance of the conductor. In addition, since the connection between the coils is provided at the coil end, the field winding becomes long, and the size of the superconducting rotor becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to increase a field current by reducing a magnetic flux density at an end portion of a field winding. It is an object of the present invention to provide a superconducting rotor having a small-sized and high-performance field winding by performing connection between them.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention accommodates a superconducting field winding in a slot provided on a winding mounting shaft with superconducting conductors arranged in 2N rows in a straight portion slot. In the superconducting rotor, the innermost slots are arranged in N rows, the outer slots are arranged in 2N rows, and the outermost slots are arranged in N rows. It is. Further, in addition to the above-mentioned means, the connection between the coils is made within a slot where the superconducting conductor of the coil end portion is wound in 2N rows.

[0012]

With the superconducting rotor having such a configuration, the following operational effects can be obtained. Generally, the magnetic flux distribution of the field winding has a high magnetic flux density at the coil end portion, and becomes maximum at the inner peripheral coil end portion of the innermost peripheral coil.

In the present invention, since the number of rows in the slot at this portion is N rows, which is half of the conventional one, the magnetic flux density at this portion is greatly reduced. Further, in the corner portion of the coil end portion where the magnetic flux density increases, all the coils are separated into N rows, so that the magnetic flux density at this portion is also reduced.

As described above, in the conventional superconducting field winding, the magnetic flux density is reduced in the portion where the magnetic flux density is high, so that the field winding current is increased and the performance of the field winding is improved. Can be improved. In addition, since the connection between the coils is made in a slot formed by 2N rows of superconducting conductors at the coil end, no special space for connecting the superconducting conductor is required at the coil end, and the coil end is short. Therefore, the size of the superconducting rotor can be reduced. Further, since the coil end portions on both sides have the same length, the magnetic center position of the field winding becomes clear.

[0015]

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

FIG. 1 shows an example of the configuration of a superconducting field winding in a superconducting rotor according to the present invention. FIG. 1 (a) is a schematic view showing the connection of field windings, and FIG. A-A
It is arrow sectional drawing along a line. As shown in FIG. 1, the field winding 1 has two rows of superconducting conductors in the field winding linear portion 1a, but in the field winding end portion 1b, the innermost peripheral side is formed as shown in FIG. One row is provided, and two rows of slots are provided outside the straight section # 1 coil on the outer side and # 2 coil inner side. The superconducting conductor is wound by a double pancake method according to two-row arrangement in the slot of the straight portion, and the connection between the coils is made at the superconducting conductor connecting portion 11 as shown in FIG.

With this configuration, the magnetic flux density at the coil end portion is greatly reduced because the superconducting conductors are arranged in a line at the innermost peripheral side, and all the positions at the corner portions of the coil end portion are reduced. Thus, the superconducting conductors are arranged in one row, so that the magnetic flux density decreases.

Therefore, the magnetic flux density in the innermost peripheral portion and the corner portion of the coil end where the magnetic flux density becomes high in the conventional superconducting rotor is reduced, so that the field current is increased as compared with the field winding of the conventional configuration. be able to.

Further, since the superconducting conductors are connected inside the conductors arranged in two rows of the coil end portions, no special space for connection is required, and the length of the coil end portions can be shortened.

In this case, since the superconducting conductor is wound in a double pancake system in a two-row arrangement of straight portions,
Since almost no voltage is generated between the rows at the uppermost portion of the slots arranged in two rows in the coil end portion, the connection between the coils is made at the center between the rows as shown in the cross-sectional view of FIG. The insulation between the ground and the ground can be sufficiently provided. It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the scope of the invention.

[0021]

As described above, according to the present invention, the magnetic flux density at the innermost peripheral side of the coil end and the corners of the superconducting field winding can be reduced. A magnetic field can be obtained, and a superconducting rotator capable of effectively utilizing the capability of the superconducting conductor can be obtained. Further, since connection between the coils can be performed without providing a special space, the length of the field winding can be reduced, and a small superconducting rotor can be obtained.

[Brief description of the drawings]

FIGS. 1A and 1B show a configuration of a superconducting field winding in one embodiment of a superconducting rotor according to the present invention, wherein FIG. 1A is a schematic diagram showing connection of the field winding, and FIG. Arrow sectional drawing which follows the AA line.

FIG. 2 is a cross-sectional view showing a schematic configuration example of a conventional two-pole superconducting rotor.

FIG. 3 is a diagram showing a conventional field winding for one slot.

FIG. 4 is a schematic diagram showing a connection configuration of a conventional field winding.

[Explanation of symbols]

1 ... field winding, 2 ... field winding mounting shaft, 3 ... liquid helium, 4 ... liquid helium container, 5 ... vacuum insulation layer,
6: radiation heat shield, 7: room temperature damper, 8a, 8
b, 8c, 8d ... insulating spacer, 9 ... superconducting conductor,
10 ... wedge, 11 ... superconducting conductor connection part.

Claims (2)

(57) [Claims] 1. A superconducting rotor in which superconducting field windings are accommodated in a slot provided on a winding mounting shaft in a superconducting conductor arrangement in a linear portion slot in 2N rows, and a superconducting conductor in an end portion slot is provided. A superconducting rotator, wherein the innermost slots are arranged in N rows, the outermost slots are arranged in 2N rows, and the outermost slots are arranged in N rows. 2. The superconducting rotator according to claim 1, wherein the connection of the superconducting conductor between the slots is performed within the slot of the end portion.