JPS61272903A - Saddle type superconductive field winding - Google Patents

Abstract

PURPOSE:To reduce the movement of a winding as well as to enhance its cooling property by a method wherein a race-track shape superconductive winding is formed by inserting an epoxy resin impregnated semicured tape between winding conductors in such a manner that it threads its way through the winding conductors, and the tape is formed into saddle shape by applying pressure. CONSTITUTION:Epoxy resin is impregnated between winding conductors 19, the winding conductors 19 are pressed down by inserting a semicured gas tape 22 between the winding conductors as if the tape threads its way through the winding conductors, and the jointless superconductive winding 23 of two layer race track shape is manufactured in a plurality of rows. Space 24 is formed at the cross-sectional part where the semicured tape 22 is not inserted. The winding 23 formed through the above-mentioned procedures is placed on a semicircular pole-shaped stand (not illustrated in the diagram), the tape 22 is semicured in the pressed state, and a saddle-shaped superconductive winding 27 is formed tightly. As a result, the movement of the winding is reduced, and its cooling strength can be improved by feeding helium into the space 24.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a saddle-shaped superconducting field winding for use in a superconducting generator, and more particularly to a saddle-shaped superconducting field winding with improved support and cooling. Regarding lines.

[Background of the invention]

FIG. 3 shows a conventional example of a superconducting rotor incorporated in a superconducting generator. The superconducting rotor includes a cylindrical torque tube 1, saddle-shaped superconducting field windings 2A and 2B, a helium container 3. damper 4 and rotating shaft 5A.

5B, these rotating shafts 5A and 5B have bearings 6
It is supported by A and 6B, respectively. and,
A liquid helium introduction lower and a gas helium discharge port 8 are provided at the non-drive side shaft end, and the saddle-shaped superconducting field windings 2A, 2 are supplied with liquid helium 9 supplied from the liquid helium introduction lower.
B is cooled and maintained at an extremely low temperature of about 4.2" K. Current is supplied from the DC power supply 12 through this saddle 11B. Note that 13 is a stator winding, and 14 is a stator winding. The stator core 15 is a frame.The saddle-shaped superconducting field windings 2A and 2B are inserted into saddle-shaped grooves provided on the outer circumferential side of the cylindrical torque tube 1, as shown in FIGS. 4 and 5. A bind wire 16 is wound on the outer periphery of the inserted saddle-shaped superconducting field windings 2A', 2B, and on the outer periphery of this bind wire.

A concentric FRP layer 17 is provided, onto which a reinforcing cylinder (not shown) is shrink-fitted. Saddle-shaped superconducting field winding 2
The cooling of A and 2B is achieved by pushing the liquid helium 9 filled in the inner circumferential side of the torque tube l toward the saddle-shaped superconducting field winding by centrifugal force, The water flows through a cooling channel 18 provided in the air.

As shown in FIG. 6, the superconducting field windings 2A and 2B include
A superconducting wire is wound into a saddle shape, and the entire winding is impregnated with epoxy resin. Therefore, although the movement of the winding conductor can be suppressed, only the outer circumferential surface of the winding can be cooled, so there is a drawback that the cooling performance deteriorates. In FIGS. 6 and 7, the epoxy resin 20 impregnated between the superconducting wires 19 contracts during heating and curing to generate strain, which remains as strain stress. When these superconducting field windings 2A and 2B are attached to a rotor, cooled with liquid helium, and rotationally excited, thermal contraction stress, electromagnetic stress, and centrifugal stress are applied to the superconducting field windings, and the impregnated epoxy resin 20 The strain may be locally released and cause a crack 21. Since epoxy resin has a large intermolecular bonding force, the clutch generation energy is large, and when a crack occurs, sufficient heat is generated to quench the superconducting field winding. This quench-generated heat is conducted to the superconducting wire 19 due to the poor cooling properties of the winding, causing a local temperature rise and quenching.Therefore, there is a drawback that the current density in the winding cannot be sufficiently increased.

In this way, resin-impregnated windings have problems with cooling performance and crack generation, so even if the movement of the windings is sacrificed to some extent,
Methods to improve cooling performance without impregnating with resin have also been adopted. For example, as in U.S. Patent No. 3,816,780,
There is a method of winding superconducting wire in a saddle shape around the outer circumference of a torque tube and tightening each layer with a band. According to this method.

When winding the wire in a saddle shape, it is not possible to apply sufficient tension, and the winding wire tends to loosen.As a result, the winding conductor tends to move due to electromagnetic force and centrifugal force, causing frictional heat and eddy current products. As a result, the performance of the superconducting field winding decreases.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a saddle-shaped superconducting field winding with reduced winding movement, improved cooling performance, and stable high current density.

[Summary of the invention]

The main point of the present invention is to form a racetrack-shaped superconducting winding by threading an epoxy resin-impregnated semi-cured tape between the winding conductors, and press this into a saddle shape using a semi-cylindrical and semi-cylindrical mold. A saddle-shaped superconducting field winding is formed by stacking a plurality of saddle-shaped windings on a torque tube and supporting them by binding.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIGS. 1, 2, and 8 to 12@.

FIG. 8 shows a racetrack-shaped superconducting winding from which a saddle-shaped superconducting winding of the present invention is formed.

Winding is done using the double pancake winding method, with 1 winding body 1
9, a semi-cured gas tube 22 impregnated with epoxy resin and semi-hardened is inserted between the winding conductors to hold down the winding conductor 19, and a two-layer lace is formed in multiple rows without connecting parts. A track-shaped superconducting winding 23 is manufactured. In the cross section, a space 24 is formed where semi-cure tape 22 is not inserted, and where semi-cure tape 22 is inserted, it is inserted so as to thread between the winding conductors. The racetrack winding thus formed is placed on a semi-cylindrical mold base 25 as shown in FIG. By pressing with more force (arrow) and at the same time heating and curing the semi-cured glass tape in the pressed state, a saddle-shaped superconducting winding with no slack can be formed. It is easy to wind the wire in a racetrack shape and it can be wound tightly, and when the saddle shape is formed by pressing, the corners of the winding are bent and the entire winding is tightly tightened. It is suitable for producing shaped windings. The aforementioned saddle-shaped superconducting winding 27
As shown in FIG. 1, multiple rows of semi-cured tape are inserted in both the upper and lower windings at certain intervals in the winding direction. Second
In the cross section shown in the figure, two adjacent rows of semi-cured glass tape 22 are inserted between the conductors of the upper winding, threading between the winding conductors, and the semi-cured glass tape 22 in the second and second rows is inserted between the conductors of the upper winding. - The loop 22 is inserted with the winding conductor 19 shifted by one line. Therefore, the first winding conductor 19 is made of semi-cured glass tape 2.
2, the semi-cured glass tape is not inserted into the space 24 for both the upper layer winding and the lower layer winding. is formed. The saddle-shaped superconducting windings formed in this manner are supported on the torque tube as shown in FIG. The superconducting field windings 2A and 2B are formed by stacking them and applying a band 28. Saddle-shaped superconducting field winding 2
The gaps between the side surfaces of A and 2B and the torque tube 1 are filled with adhesive 29 to eliminate movement of the windings. With this configuration, the saddle-shaped superconducting field windings 2A and 2B are free from electromagnetic force. The space 24 inside the 0th winding, which hardly moves even when centrifugal force is applied, becomes a cooling channel through which liquid helium passes, so the cooling performance is very good and the heat generated by the minute movement of the 1st winding can be quickly removed. be.

(Effects of the Invention) According to the present invention, even if there is minute movement in the winding conductor due to electromagnetic force and centrifugal force due to rotational excitation, heat generated due to friction etc. is quickly removed, so the superconductivity of the winding is stable. do.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a saddle-shaped superconducting winding according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the nn arrow in Fig. 1, and Fig. 3 is a superconducting coil using a conventional superconducting rotor. Vertical cross-sectional view of the generator, No. 4
The figure is a perspective view of the M frame portion in FIG. 3. Fig. 5 is a sectional view taken along the line ■-■ in Fig. 4, Fig. 6 is a perspective view of a conventional saddle-shaped superconducting field winding, Fig. 7 is a sectional view taken along -■ in Fig. 6, and Fig. 8 9 is a plan view of the racetrack-shaped superconducting winding before forming the saddle-shaped superconducting winding of the present invention, and FIG. 9 is a cross-sectional view taken along arrows [-1] in FIG. Fig. 10 is a sectional view taken along the line X-X in Fig. 8, and Fig. 11 is a book 0
FIG. 2 is a perspective view of a method of forming a saddle-shaped superconducting winding of the invention. FIG. 12 is a perspective view of a saddle-shaped superconducting field winding formed by stacking a plurality of saddle-shaped superconducting windings according to the present invention. 2A, 2B...Saddle-shaped superconducting field winding t19...Wound conductor, 22...Resin-impregnated semi-cured glass tape, No. 152] No. 252] 24 IQ Fig. 3 Fig. 4 Fig. 5121 No. b口ZA・ZF3 71iJ 6th 9th Figure 2 Graduate 1st Oguchi Dormitory IZ Group

Claims (1)

[Claims] 1. In a saddle-shaped superconducting field winding formed by winding a superconducting wire in a saddle shape in a plurality of cases and in a plurality of stages, a resin-impregnated semicured tape is inserted between the winding conductors to form a mesh. The method is characterized in that a row of racetrack-shaped superconducting windings are pressed to form a saddle shape, a plurality of saddle-shaped superconducting windings are stacked, and a plurality of saddle-shaped superconducting windings are stacked to form a saddle shape. saddle-shaped superconducting field winding.