JPS58172969A - Superconductive rotary electric machine - Google Patents

Abstract

PURPOSE:To increase the maximum magnetic flux density capable of generating superconductive field coil by winding a superconductive wire of large critical magnetic flux density in the vicinity of the inner periphery at the end of the coil. CONSTITUTION:A superconductive wire 11a of large critical magnetic flux density is wound in the vicinity of the inner periphery at the end of a field coil 4a. In other words, a superconductive lead 11a having large critical magnetic flux density larger than a superconductive wire 11b which is wound on the other portion is wound inside the inner peripheral side of the end of the coil. In this manner, the critical magnetic field density can be largely increased, thereby increasing the maximum magnetic flux density capable of generating from the field coil 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting rotating electric machine &C, and particularly to a superconducting rotating electric machine having a stator core, an armature winding, a superconducting rotor (hereinafter referred to as a rotor), and the like.

Conventional superconducting rotating electric machinesFor example, superconducting generators with built-in superconducting field windings (hereinafter referred to as field windings) in the rotor are the first.
As shown in the figure. As shown in the figure, a superconducting generator includes a rotor 1, a stator core 2 that serves as a magnetic shield to the outside, and an electrical pre-winding device placed in the gap between the stator core 2 and the rotor 1. 413, etc. The rotor 1 includes a field winding 4 that concentrically winds superconducting wires to generate a high magnetic field, a cryogenic cylindrical torque tube 5 that supports it, and a supply/exhaust system that supplies and discharges helium from the outside to the rotor 1. It consists of a cylindrical damper shield 7 and a radiation shield 8 that electromagnetically shield the field winding @4 from the vibro and armature reaction AC magnetic flux, and the field winding @4 is connected to an external DC power supply via a slip ring 9. It is excited by The drive side of the rotor 1 is supported by a bearing 10, while the non-drive side is supported by a damper shield 7 in order to fully tolerate the axial heat shrinkage difference between the cryogenic torque tube 5 and the room temperature damper shield 7.
and a torque tube 5 are supported on each side by double bearings 1°a and 10b.

In a superconducting generator with such a structure, it is theoretically impossible to use magnetic materials that have problems with magnetic saturation on the inner diameter side of the stator core 2, so the magnetic flux distribution generated by the field winding 4 is It becomes a three-dimensional distribution. In particular, at the inner circumference of the end of field winding #4, the horizontal axis represents the axial position, and the vertical axis represents the magnetic flux density of the field winding, and the relationship between the axial position of field winding 4 and the magnetic flux density is As shown in Figure 2 where the relationship is shown, the magnetic flux density B
, has a maximum value larger than the magnetic flux density Bs of the winding body. This is because the magnetic flux due to the 1 m flow at the end whose direction is spatially shifted by 90° from the winding trunk is also added.

By the way, the maximum value B of the magnetic flux density generated at the inner circumference of the winding end is approximately 1.3 to 1.
When this reaches the critical magnetic flux density of the superconducting wire used, the field winding undergoes a normal conduction transition (quench), so the maximum magnetic flux density that can be generated in the field winding is at the end of the winding. The disadvantage was that it was restricted by the inner periphery.

The present invention has been made in view of the above points, and its object is to provide a superconducting rotor machine that can increase the maximum magnetic flux density that can be generated by a superconducting field winding.

That is, the present invention is characterized in that a superconducting wire having a high critical magnetic flux density is wound near the inner cylinder at the end of the superconducting field winding.

The present invention will be explained below based on the illustrated embodiments. FIG. 3 shows an embodiment of the invention. Note that parts that are the same as those in the prior art are given the same reference numerals, so their explanations will be omitted. In this embodiment, a superconducting wire 11a having a large critical magnetic flux density is wound near the inner periphery of the end of the field winding 1Ij4a. That is, a superconducting wire 11a having a larger critical magnetic flux density than the superconducting wire 11b wound around the other portion was wound around the inner circumferential side of part 1 of the winding as indicated by dots in the figure. In this way, the superconducting wire 118 with a steep critical magnetic flux density is wound around the inner periphery of the end of the winding where the maximum magnetic flux density occurs, making it possible to have a large critical magnetic flux density. It becomes possible to increase the maximum magnetic flux density at which the field winding 4a can generate compared to the conventional case. In the figure, qN is the interpolar axis, and d axis is the magnetic axis.

As described above, the present invention involves winding a superconducting wire with a large critical magnetic flux density near the inner periphery of the end of a superconducting field winding.
It has become possible to increase the critical magnetic flux density at the inner periphery of the end of the superconducting field winding, making it possible to increase the maximum magnetic flux density that can be generated by the superconducting field winding. A superconducting rotating electrical machine that can increase the maximum magnetic flux density that can be generated by the windings can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of a conventional superconducting rotating electric machine, Fig. 2 is a characteristic diagram showing the relationship between the axial position of the field winding section of the conventional superconducting rotating electric machine and magnetic flux density, and Fig. 3 is a characteristic diagram of the present invention. FIG. 2 is a sectional view of a field winding body of an embodiment of a superconducting rotating electrical machine.

Claims (1)

[Claims] 16 A stator core, an armature winding fixed to the inner hole of the stator core, and a superconducting rotor disposed in the armature winding with a gap in between, the superconducting rotor having a , in a superconducting rotating electric machine having a built-in superconducting field winding wound with superconducting wire, a superconducting wire having a large critical magnetic flux density is wound near the inner periphery of the end of the superconducting field winding. 't-Characteristic superconducting rotating electric machine.