JPH0145834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a rotor for a superconducting rotating electric machine.

(Prior Art) A conventional rotor of this type is shown in FIG. In Fig. 1, 1 is a torque tube;
Reference numeral 2 denotes a coil mounting shaft forming the central portion of the torque tube 1, 3 a superconducting field coil fixed to the coil mounting shaft 2, 4 a room temperature damper surrounding the torque tube 1 and the coil mounting shaft 2, and 5 a normal temperature damper. A low-temperature damper is disposed between the room-temperature damper 4 and the coil mounting shaft 2; 6 and 7 are helium outer cylinders and helium end plates attached to the outer circumference and side surface of the coil mounting shaft 2, respectively; 8 and 9 are helium end plates; drive side and non-drive side end shafts, 10 is a bearing that pivotally supports these end shafts 8 and 9, 11 is a slip ring for supplying field current, 1
2 is a heat exchanger formed or placed in the torque tube 1; 13 is a side radiation shield; 14 is a vacuum section; 15 is a liquid helium reservoir; 16 is a retainer provided at both ends of the coil mounting shaft 2. It is a ring.

In the rotor of the superconducting rotating machine having the above configuration, the superconducting field coil 3 disposed on the coil mounting shaft 2 is cooled to an extremely low temperature to bring the electrical resistance to zero and eliminate excitation loss. As a result, a strong magnetic field is generated in the superconducting field coil 3, and AC power is generated in the stator (not shown). In order to cool and maintain this superconducting field coil 3 at an extremely low temperature, liquid helium is introduced from the center of the non-drive side end shaft 9 through a pipe (not shown) formed by a helium outer cylinder 6 and a helium end plate 7. The torque tube 1 is made of a thin-walled cylinder and supplies the liquid helium to the liquid helium container section in which the helium is stored, while maintaining the inside of the rotor at a high vacuum in the vacuum section 14, and transmitting rotational torque to the ultra-low temperature superconducting field coil 3 and the coil mounting shaft 2. The most common structure is to provide a heat exchanger 12 and to reduce as much as possible the heat that enters the cryogenic part through the torque tube 1. Furthermore, in order to reduce the heat that enters due to radiation from the sides, the side radiation shield 13
is provided.

On the other hand, the normal temperature damper 4 and the low temperature damper 5 have the function of shielding harmonic magnetic fields from the stator, protecting the superconducting field coil 3, and attenuating rotor vibrations caused by disturbances in the power system.
Generally, the normal temperature damper 4 functions as a vacuum outer cylinder, and the low temperature damper functions as a radiation shield for the helium container. In FIG. 1, piping constituting a helium introduction and discharge system inside the rotor and a helium introduction and discharge device connected to the rotor are omitted.

Next, the structure in which the superconducting field coil is wound in the groove on the surface of the coil mounting shaft will be described in more detail.

FIG. 2 shows the cross section AA in FIG. 1.
However, since the purpose here is to explain the superconducting field coil, parts unnecessary for the explanation have been omitted.

In Fig. 2, 2 is the coil mounting shaft, 17 is a groove provided in the axial direction on the surface of the coil mounting shaft 2, and 3 is the groove 1.
A superconducting field coil 7 is housed in the groove 17, 18 is an insulating groove, 19 is a wedge for holding the superconducting field coil 3 in the groove 17, and 20 is a wedge insulating member.

In FIG. 2, the superconducting field coil 3 is located at B-B
It is wrapped around the wire, so B-B
Generates a strong magnetic field centered around the wire.

FIG. 3 shows the end of the coil mounting shaft 2 of FIG. 1 in detail. That is, the end portion of the superconducting field coil 3 is shown.

In Fig. 3, 2 is a coil mounting shaft, 3 is a superconducting field coil, 16 is a retaining ring that is shrink-fitted to the coil mounting shaft 2, and 21 is arranged in a cylindrical shape at the bottom of the stepped part of the coil mounting shaft 2. The installed insulating base plate 22 is an insulating pawl that is firmly driven into the space between the coils and the gap between the coil and the side wall of the step-down part after the superconducting field coil 3 is installed on the outside of the insulating base plate 21. It is a protective cover placed around it. The insulating bottom plate 21 is made of two semi-cylindrical insulators as shown in FIG.
The pieces are combined into a cylindrical shape, with a diameter of several tens of centimeters.
It is.

The insulating floor plate 21 is made of an insulating material such as cast insulating material, molded insulating material, FRP, or the like.

Note that FIG. 4 is drawn to help understand FIG. 3, and is a perspective view of the end of the coil mounting shaft 2. Each reference numeral in the figure is the same as in FIG. 3.

With the end configuration as described above, the superconducting field coil 3 is held extremely firmly because the top surrounded by the insulating material is compressed by the holding ring. The main functions of the insulating base plate 21 are the superconducting field coil 3 and the coil mounting shaft 2.
The purpose is to provide electrical insulation between the superconducting field coil 3 and the bottom of the step-down part, and to firmly hold the coil against centrifugal force, electromagnetic force, thermal stress, etc. applied to the superconducting field coil 3. Therefore, the thickness of the insulating bottom plate 21 is required to be approximately several mm.

(Problem to be solved by the invention) In the rotor of a conventional superconducting rotating electric machine, the insulating base plate is manufactured as described above, so in the case of cast insulators, mold costs are required in addition to the material costs. It became expensive. In addition, in order to manufacture the insulating floor plate 21 by cutting it out of an insulating material, it is necessary to process it with high precision using a cutting machine, which requires a large amount of processing cost and requires a large amount of time and effort for assembly. There was an issue that I had to do.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and provides a method for manufacturing a rotor for a superconducting rotating electrical machine at low cost and with easy assembly work by forming insulating bottom plates into a laminated structure and bonding between them. The purpose is to provide the following.

(Means for Solving the Problems) A method for manufacturing a rotor for a superconducting rotating electrical machine according to the present invention includes a method for manufacturing a rotor for a superconducting rotating electric machine, in which a cylindrical coil is inserted between a coil mounting shaft of the rotor and a superconducting field coil fixed thereto. The insulator is formed by laminating thin plate-like insulators while adhering them to each other.

(Function) The cylindrical insulator in this invention firmly holds the superconducting field coil.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 6 shows an insulating bottom plate 21 as a cylindrical insulator constructed by laminating several insulating plates and bonding them together. In the figure, since two insulating plates are used for each layer and the insulating plates are laminated together with the seams shifted in each layer, the insulating base plate 21 has sufficient strength. The thickness of the insulating plate is determined in consideration of conditions such as having a certain degree of bendability, reducing the number of laminated sheets, and being easily available. For example, a thermosetting laminate with a thickness of 0.5 mm is used.

In this way, the insulating bottom plate 21 can be manufactured at extremely low cost because insulating plates that are produced in large quantities and at low cost can be used.

Further, since the production of the insulating bottom plate 21 and the attachment to the coil attachment shaft are performed at the same time, the work is streamlined.

(Effects of the Invention) As described above, the method for manufacturing a rotor for a superconducting rotating electrical machine according to the present invention provides a method for manufacturing a rotor for a superconducting rotating electrical machine, which is a method for manufacturing a rotor for a cylindrical rotor that is inserted between a coil mounting shaft of a rotor and a superconducting field coil fixed thereto. Since the insulating material is formed by laminating thin plate-like insulating materials while adhering them to each other, an excellent practical effect is achieved in that the assembly work becomes extremely easy.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the overall outline of a conventional superconducting rotating electric machine rotor, and Fig. 2 is a line A in Fig. 1.
3 and 4 are sectional views and perspective views showing the structure of the end portion of the superconducting field coil, respectively. FIG. 5 is a sectional view showing the formation of a conventional insulating bottom plate, and 6 The figure is a sectional view showing the shape of an insulating floor plate applied to an embodiment of the present invention. In the figure, 2 is a coil mounting shaft, 3 is a superconducting field coil, 16 is a holding ring, and 21 is an insulating base plate as a cylindrical insulator. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 The superconducting field coil fixed to the coil mounting shaft of the rotor of a superconducting rotating electric machine is held in a wedge in a groove provided on the surface of the coil mounting shaft to which the superconducting field coil is mounted in the straight section, and is held by a wedge at the end. In the section, the mounting shaft is fitted into a stepped part provided on the mounting shaft via a cylindrical insulator, and after filling the gap with an insulator and surrounding the outer periphery with the insulator, the coil is attached to the coil mounting shaft. In the method for manufacturing a rotor of a superconducting rotating electric machine, which is held by a retaining ring that is fitted and covers the step-down portion, the cylindrical insulator is formed by laminating thin plate-like insulators while adhering them to each other. A method for manufacturing a rotor for a superconducting rotating electrical machine, characterized by: