JPH0789741B2 - Superconducting rotating electric machine rotor - Google Patents

Description

The present invention relates to the structure of a rotor of a superconducting rotating electric machine.

[Conventional technology]

7 and 8 are sectional views showing a conventional rotor disclosed in, for example, Japanese Patent Laid-Open No. 57-202852. In the figure,
(1) is a coil mounting shaft, (2) is a helium vapor space provided on the coil mounting shaft (1), (3) is a liquid helium reservoir, (4) is a slot provided on the coil mounting shaft (1), (5) is a superconducting field coil housed in the slot (4), (6a) is an upper insulator arranged on the antihelium vapor space side of the superconducting field coil (5), and (6b) is an upper insulating layer. Insulator in slot other than item (6a), (7) wedge,
(8) is a helium outer cylinder, (9) is a helium flow path provided between the coil mounting shaft (1) and the helium outer cylinder (8),
(10) is a mounting shaft helium passage hole provided in communication with the liquid helium reservoir (3) and the slot (4), and (11a) is, for example, a circular through hole formed in the upper insulator (6a). ,
(11b) is, for example, a circular through hole formed in the insulator (6b) other than the upper insulator (6a).

Generally, in a superconducting rotating electric machine, there is an important technical problem in how to perform cryogenic cooling of a superconducting field coil. In order to bring the superconducting field coil into the superconducting state, it is necessary to cool it to a temperature below the superconducting transition temperature, and at present, helium is kept at an absolute temperature of 1K to 20K as a cooling medium. On the other hand, in such an extremely low temperature state, the specific heat of the superconducting field coil is extremely small.Therefore, a slight heat generation in the superconducting field coil or a small amount of heat entering the superconducting field coil causes There is always the risk that the temperature of the coil will rise and exceed the superconducting transition temperature. Therefore, it is important for the design of a superconducting rotating electric machine how to quickly remove the minute heat generation in the superconducting field coil or the small amount of heat entering the superconducting field coil to suppress the temperature rise of the superconducting field coil. It will be a point.

Next, the cooling operation will be described. Minute heat generation in the superconducting field coil (5) or superconducting field coil (5)
The heat generated by the slight heat penetration into the superconducting field coil (5) is absorbed by the helium present in the slight gap with the insulator on the outer peripheral side of the superconducting field coil (5). Helium that has expanded in density and decreased in density due to heat absorption passes through the through hole (11b) in the insulator (6b) by natural convection due to centrifugal force, and then passes through the helium flow path hole (10) in the coil take-up shaft (1). Pass through the liquid helium pool (3). On the other hand, the helium shortage that occurs around the superconducting field coil (5) passes through the gap between the helium flow path (9) and the wedge (7) and the through hole (6a) of the upper insulator (6a), and 5) Supplemented by helium flowing in around. The heat-expanded helium is cooled by evaporating a part of it in the liquid helium pool (3). The cooled helium enters the periphery of the superconducting field coil (5) from another helium channel hole (10) through the through hole (11b) of the insulator (6b), and further penetrates the upper insulator (6a). It passes through the gap between the hole (11a) and the wedge (7) and exits into the helium channel (9).

By performing the smooth natural circulation as described above, the superconducting field coil (5) is cooled, and the superconducting field coil (5) is maintained at the superconducting transition temperature or lower.

[Problems to be solved by the invention]

In the superconducting state, almost no voltage is generated in the superconducting field coil (5), but if the superconducting state is destroyed, several hundreds or
Since a voltage of about 1000V is generated, it is necessary to provide sufficient insulation so that this voltage will not cause dielectric breakdown.

In the conventional rotor, as shown in FIGS. 7 and 8, the superconducting field coil (5) is housed in the slot (4) of the coil mounting shaft (1) to surround the superconducting field coil (5). Insulators are placed on. In order to circulate helium that cools the superconducting field coil (5), a hole (11a) must be formed in the upper insulator (6a) to form the flow path, but the part where the hole (11a) is formed. Then, the insulation performance will decrease. As a solution to this, a method of increasing the thickness of the upper insulator (6a) and providing a sufficient insulation distance can be considered, but the volume occupied by the insulator in the slot (4) becomes considerable. Therefore, the other parts in the slot (4) must be made smaller by the volume thereof, and particularly making the volume of the superconducting field coil (5) smaller means that the capacity of the superconducting field coil (5) decreases. It becomes a big problem in terms of performance. Alternatively, if the parts inside the slot (4) outside the insulator are made to have the same volume, the depth of the slot (4) must be made deeper by an amount corresponding to the increased thickness of the upper insulator (6a), which is not efficient.

The present invention has been made to solve the above problems, and it is possible to increase the insulation distance without decreasing the superconducting field coil capacity and without making the slot depth deeper than necessary. The purpose is to

[Means for solving problems]

A rotor according to the present invention has an upper insulator that is in contact with an outer peripheral side of a superconducting field coil, is divided into two, and an inner peripheral side of the upper divided insulator is divided into two parts. Circumferential helium flow passage grooves are provided, and radial helium flow passage holes provided in the outer insulator and the inner peripheral side upper insulator are provided at positions axially aligned with each other.

[Action]

In the present invention, the upper insulator is divided into two, and the axial helium channel groove and the circumferential helium channel groove are provided on the outer peripheral side of the inner peripheral side upper insulator, and the circumferential helium channel groove is formed. Since the radial helium flow passages that communicate with each other are provided, the helium that flows in through the radial helium flow passage holes on the outer peripheral side upper insulating material is entirely covered by the axial helium flow passage groove and the circumferential helium flow passage groove. It is efficiently diffused and can be uniformly supplied to the entire surface of the superconducting field coil through the helium flow passage holes in the radial direction of the upper insulator on the inner circumference side. Further, by providing the radial helium flow passage holes in the upper insulator at positions axially offset from each other, the insulation distance can be increased, so that the increase in the thickness of the insulator in the slot can be suppressed. You can

[Embodiment] The configuration of the rotor of the superconducting rotary electric machine according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 6. 1 and 2 (1) to (5), (6b), (7)
(10) and (11b) have the same structure as the conventional rotor. In FIG. 1, (6c) is an upper insulator attached to the outer peripheral side of the superconducting field coil (5) on the inner peripheral side of the two parts, and (6d) is an outer peripheral side of the two divided parts. It is an upper insulator. In FIG. 2, (6c) is provided on the inner peripheral side upper insulator, (6d) is provided on the outer peripheral side upper insulator, (11c) is provided on the inner peripheral side upper insulator (6c), and the superconducting field coil ( 5) is a radial helium flow channel hole provided so that liquid helium that has cooled 5), that is, a first coolant flow channel hole. (11d) is the inner peripheral upper insulator (6c)
An axial helium channel groove connected to the radial helium channel hole (11c) of the inner peripheral upper insulator (6c),
That is, the second coolant channel groove. (11e) is provided in the inner peripheral side upper insulator (6c), intersects with the axial helium flow channel groove (11d), and is a helium flow channel hole (11c) in the inner peripheral side upper insulator (6c). It is a circumferential helium channel groove provided in the circumferential direction at a position connected to, that is, a first refrigerant channel groove. (11f) is a circumferential helium channel groove (11) of the inner peripheral upper insulation (6c) of the outer peripheral upper insulation (6d).
e) A radial flow passage hole, that is, a second coolant flow passage hole provided at a position axially separated from e). (11g) is a helium flow passage hole provided at a position communicating with the radial helium flow passage hole (11f) provided in the outer peripheral upper insulator (6d) of the wedge (7), that is, the third refrigerant flow. It is a road hole. Third
FIGS. 1 to 6 are views for helping understanding of FIGS. 1 and 2.

In the rotor configured as described above, the helium flowing from the wedge (7) through the helium passage hole (11g) is
Radial helium flow passage hole (11
It flows through f) to the outer peripheral side of the inner peripheral upper insulator (6c). Then, it passes through the axial helium channel groove (11d) and flows into each circumferential helium channel groove (11e). Further, it is supplied to the superconducting field coil 5 through the radial helium flow passage hole (11c). Therefore, the helium is efficiently diffused by the axial helium flow channel groove (11d) and the circumferential helium flow channel groove (11e) to the entire outer peripheral side of the inner peripheral upper insulator (6c), and the radial helium flow channel is formed. Hole (11
It is uniformly supplied from c) over the entire surface of the superconducting field coil (5). As a result, the heat of the superconducting field coil can be smoothly removed, and the performance of the superconducting field coil can be improved. In addition, the circumferential helium channel groove (11e) of the inner peripheral upper insulator (6c) and the radial helium channel hole (11f) of the outer peripheral upper insulator (6d) are axially aligned. Is the insulation distance, that is, the radial helium flow passage hole (11) provided in the upper insulation (6c) on the inner circumference side from the superconducting field coil (5).
c), through the wall surface of the circumferential helium flow channel (11e), the circumferential helium flow channel (11e) and the radial helium flow channel on the outer peripheral surface of the inner peripheral side upper insulator (6c) Hole (11
The distance to the edge (7) through the wall surface of the radial direction helium flow passage hole (11f) of the outer peripheral side upper insulator (6d) is increased through the axial distance of (f). Things are better with thin things. Therefore, the ratio of the volume occupied by the upper insulator and the other insulator (6d) in the slot decreases, and conversely the volume of the superconducting field coil (5) can be increased. It is possible to increase.

〔The invention's effect〕

According to the present invention, as described above, the upper insulator is divided into two, and the axial helium channel groove and the circumferential helium channel groove are provided on the outer peripheral side of the inner peripheral side upper insulator, and the circumferential helium channel is provided. Since the radial helium flow passage that communicates with the groove is provided, the helium that flows in through the radial upper helium flow passage of the outer peripheral side insulating material is generated by the axial helium flow passage groove and the circumferential helium flow passage groove. Efficiently diffuses over the entire area, can be uniformly supplied to the entire surface of the superconducting field coil through the radial helium flow passage hole of the inner peripheral upper insulator, and the heat of the superconducting coil can be smoothly removed. .
Furthermore, by providing radial helium flow passage holes in the upper insulator at axially spaced positions, it is possible to increase the insulation distance, increase the superconducting field coil capacity, and increase the withstand voltage of the insulator. It is possible to provide the rotor of the superconducting rotating electric machine that is enabled.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotor of a superconducting rotating electric machine according to an embodiment of the present invention, FIG. 2 is a sectional side view of the vicinity of the slot top portion of FIG. 1, and FIGS. A front view and a cross-sectional side view of the inner peripheral side upper insulating material, FIGS. 5 and 6 are a front view and a cross-sectional side view of the outer peripheral side upper insulating material according to the present invention, and FIG. 7 is a conventional superconducting rotating electric machine. FIG. 8 is a sectional view of the rotor of FIG. 8, and FIG. 8 is a detailed view near the slot top portion of FIG. In the figure, (1) is a coil mounting shaft, (4) is a slot, (5) is a superconducting field coil, (6c) is an inner peripheral upper insulation, (6d) is an outer peripheral upper insulation, and (7). Is a wedge,
(11c) is a radial helium flow channel hole, (11d) is an axial helium flow channel groove, (11e) is a circumferential helium flow channel groove, (1
1f) is a radial helium channel hole, and (11g) is a helium channel hole. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Maeda 1-2-2 Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Electric Corporation Kobe Works (72) Inventor Koichi Oshita Hyogo-ku, Kobe-shi, Hyogo 1-2-2 Wadazakicho Mitsubishi Electric Co., Ltd. Kobe Works (72) Inventor Toshiki Hirao 1-2-2 Wadazakicho, Hyogo-ku, Kobe Hyogo Prefecture Mitsubishi Electric Co., Ltd. (72) Inventor Mitsuhiro Uchida 1-2-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Electric Corporation Kobe Works (56) Reference JP-A-56-56168 (JP, A) JP-A-57-162945 (JP, A) ) JP-A-57-202851 (JP, A)

Claims (1)

[Claims] 1. A superconducting coil housed in a slot provided on the outer periphery of a coil mounting shaft of a rotor of a rotary electric machine, an inner peripheral upper insulator provided in contact with the outer peripheral side of the rotor of the superconducting coil, An outer peripheral upper insulator provided in contact with the outer side of the peripheral upper insulator, a wedge in contact with the outer peripheral side of the outer upper insulator, provided in the rotor circumferential direction on the outer peripheral surface of the inner upper insulator A plurality of first coolant channel grooves, a second coolant channel groove that intersects with the first coolant channel grooves and is provided in the rotor axial direction at the center of the outer peripheral surface of the inner peripheral side upper insulator, In a rotor of a superconducting rotating electric machine having a plurality of first refrigerant passage grooves which penetrate the inner peripheral side upper insulator in a rotor radial direction and are provided at respective positions of the plurality of first refrigerant passage grooves.
Of the coolant passage hole of the outer peripheral side, which penetrates through the rotor circumferential center in the rotor circumferential direction in the rotor radial direction, and is provided at a position displaced from the position of the first coolant passage hole in the rotor axial direction. A plurality of second refrigerant flow passage holes, and a plurality of third refrigerant flow passage holes provided at positions that penetrate the wedge in the rotor radial direction and communicate with the second refrigerant flow passage holes. The superconducting rotating electric machine rotor.