JPS6255393B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor for a superconducting generator.

FIG. 1 shows a cross section of a rotor of a conventional superconducting generator. In Fig. 1, 1 is a rotor;
2 is an insulated vacuum container that may also serve as a damper.
3 is a coil mounting shaft, and 4 is a superconducting coil, which in the following description is assumed to be made of Nb-Ti (niobium titanium). 5 is a wedge for fixing the superconducting coil 4 to the coil mounting shaft 3. 6 is a magnetic pole.

Next, the operation will be explained. Coil mounting shaft 3
The superconducting coil 4 and wedge 5 are cooled with cryogenic liquid helium or helium gas, and the Nb
The superconducting coil 4 made of -Ti is maintained in a superconducting state, is energized and excited without loss of excitation resistance power, and generates a magnetic field. The rotor 1 that generated this magnetic field generates a rotating alternating magnetic field by rotating, and the rotor 1
A voltage is generated in an armature coil (not shown) provided on the outside of the motor. The superconducting generator is configured in this way.

The conventional rotor 1 was composed of the superconducting coil 4 made of Nb-Ti as described above. this is
Although Nb-Ti is easy to bend and wind, it has a low critical magnetic field, so the magnetic field that can be generated by a superconducting rotor is limited to a relatively low magnetic field. For this reason, the magnetic field of the superconducting generator was limited to about 2 Tesla, so there was a serious drawback that the size and weight of the generator could not be reduced as much as generally expected.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by applying a superconducting coil wound using superconducting wire with a high critical magnetic field to the part near the magnetic pole, it is possible to reduce the magnetic loading. The aim is to provide a high-performance superconducting power generator.

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

In FIG. 2, numeral 7 denotes a second superconducting coil wound with a compound superconducting wire such as Nb ₃ Sn (niobium tritin). One of the features of the present invention is that a second superconducting coil 7 (hereinafter appropriately referred to as a compound superconducting coil) made of a superconducting wire with a high critical magnetic field, such as the compound superconducting wire described above, is provided in the vicinity of the magnetic pole 6. It's true. The highest magnetic field in the rotor of a superconducting generator is generated near the magnetic poles. Therefore, the current (field current) that can be passed through the rotor windings is limited by the critical magnetic field of the winding portion closest to the magnetic poles. That is, the magnetic field in the portion of the winding that is relatively far from the magnetic pole is sufficiently low, and has a value well below the critical magnetic field regardless of the material of the winding. Therefore, by employing the above-mentioned second superconducting coil 7 near the magnetic poles as in the present invention, it is possible to increase the current that can be passed, the magnetic field generated by the rotor 1 can be increased, and the generator increases the magnetic loading of
Generators can be made smaller and lighter. By using the inexpensive Nb-Ti superconducting coil 4 as the coils other than the compound superconducting coil 7, the manufacturing cost of the rotor 1 can be reduced. In addition, the width and length of the compound superconducting coil 7 near the magnetic pole 6 are shortened,
It is smaller than other coils 4. Compound superconducting wires are brittle and difficult to bend and wind, but the compound superconducting coil 7 placed near the magnetic poles of the present invention is small and easy to wind, and the advantage is that it can be manufactured with high reliability. It is.

Although FIG. 2 shows the case where the compound superconducting coil 7 is only one pair of coils close to the magnetic pole 6, the number of coils is not limited to just one pair. It is obvious that the effects of the present invention can be obtained even when two or more pairs of coils close to the magnetic pole 6 are used as the compound superconducting coils 7.

FIG. 3 shows another embodiment of the present invention, which is characterized in that a slot 8 into which a compound superconducting coil 7 is fixed is formed substantially parallel to the magnetic pole direction (arrow A in the figure). With this structure, the compound superconducting coil 7 has a simple structure such as the U-shaped structure shown in FIG. 4a or the U-shaped structure shown in FIG. be. In addition, a slot S into which the compound superconducting coil 7 is inserted is provided.
are formed parallel to the magnetic pole direction as described above, so that the compound superconducting coil 7 shown in FIG. 4 can be inserted into the slot 8 and fixed without causing any mechanical stress (such as bending). I can do it.

FIG. 5 shows another embodiment of the invention. Only the slot wall surface on the side near the axial pole 6 of the slot 8 near the magnetic pole 6 into which the compound superconducting coil 7 is inserted is formed parallel to the magnetic pole direction (direction of arrow A), and the other wall surfaces are parallel to the radial direction. is formed. In this case as well, the compound superconducting coil 7 having a twisted U-shape or a twisted U-shape as shown in FIG. 6 can be inserted into the slot 8 without any difficulty. Reference numeral 9 denotes a filler made of an insulator or metal for fixing the compound superconducting coil 7 after it is inserted into the slot 8. In the case of this embodiment, since the rotating centrifugal force acting on the compound superconducting coil 7 does not act perpendicularly to the wall surface of the slot 8, there is an advantage that slot insulation is facilitated.

As described above, according to the present invention, since the second superconducting coil is configured to be applied to a portion close to the magnetic pole, the magnetic loading of the superconducting generator becomes large, the winding of the compound superconducting coil becomes easy, and the coil mounting axis Furthermore, since the application of the compound superconducting coil is limited to only one part, the manufacturing cost of the entire rotor is low, and a highly reliable rotor can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a rotor of a conventional superconducting generator, FIG. 2 is a sectional view showing a rotor of a superconducting generator according to an embodiment of the present invention, and FIGS. 3 and 5 are respectively illustrative of the invention. 4 and 6 are cross-sectional perspective views showing examples of compound superconducting coils applicable to the present invention, respectively. In the figure, 1 is the rotor, 3 is the coil mounting shaft,
4 is a Nb-Ti superconducting coil, 6 is a magnetic pole, and 7 is a compound superconducting coil. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A rotatable coil mounting shaft, and a plurality of superconducting coils fixed to the peripheral edge of the coil mounting shaft and energized in a superconducting state to form magnetic poles in the radial direction of the coil mounting shaft. In the rotor of a superconducting generator, of the superconducting coils, a superconducting coil close to the magnetic pole is made of a superconducting material having a critical magnetic field higher than a critical magnetic field of the superconducting material constituting the other superconducting coils. A rotor for a superconducting generator that is characterized by: 2. A rotor for a superconducting generator according to claim 1, wherein the superconducting coil is inserted into a slot provided in a coil mounting shaft. 3. A rotor for a superconducting generator according to claim 2, wherein slots into which superconducting coils are inserted close to the magnetic poles are provided substantially parallel to the direction of the magnetic poles. 4. The slot in which the superconducting coil is inserted near the magnetic pole should have its wall on the magnetic pole side parallel to the magnetic pole direction.
A rotor for a superconducting generator according to claim 2, wherein the other wall surfaces are parallel to each other in the radial direction. 5. The rotor of a superconducting generator according to any one of claims 1 to 4, wherein the superconducting coil adjacent to the magnetic pole is made of Nb ₃ Sn (niobium tritin). 6. The rotor of a superconducting generator according to claim 5, wherein the other portions of the superconducting coil are made of Nb-Ti (niobium titanium).