JPH02211052A - Manufacturing method of rotor of superconducting rotating electric machine - Google Patents

Abstract

PURPOSE:To promote work efficiency by arranging upper insulating materials on the peripheral surfaces of superconducting magnetic field coils after loading the superconducting magnetic fields coils to the insides of slots, fitting and loading a cylindrical body to the peripheral sides of coil mounting shafts, and fixing the superconducting magnetic field coils to the coil mounting shafts by applying plane pressure to the upper insulating materials. CONSTITUTION:Lower insulating materials 28 and insulating materials 30 in slots are loaded to the bottoms and wall surfaces of the slots 18 of coil mounting shafts 2, and semihardened insulating tapes to be impregnated with resin are wound on superconductors 25a spirally to form the superconducting magnetic field coils 25, and they are loaded to the insides of the slots 18. Upper insulating materials 29 are arranged to the peripheral sides of the superconducting magnetic field coils 25. After making the hardening treatment of the tapes, the outside surfaces of the upper insulating materials 29 are lathed, and a cylindrical body 31 are fitted to the coil mounting shafts 2 by shrinkage fit. At that time, the lathed peripheral surfaces of the upper insulating materials 29 are pushed down by the internal surface of the cylindrical body 31, and specific plane pressure is applied to the super conducting coils 25.

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 electrical machine having a structure in which a superconducting field coil is held on a coil mounting shaft.

[Conventional technology]

Conventionally, as a general rotor of this kind, for example, Japanese Patent Application Laid-open No. 61
There was a device shown in FIG. 4 disclosed in Japanese Patent No.-18846. In Figure 4, (1) is the torque tube, (2
) is the coil mounting shaft that forms the center of the torque tube (1), (3) is the superconducting field coil fixed to the coil mounting shaft (2), and (4) is the torque tube (1) and the coil mounting shaft. (2) is a room temperature damper that surrounds the coil mounting shaft (2), (5) is a low temperature damper that is disposed between this room temperature damper (4) and the coil mounting shaft (2), and (6) and ()) are the coil mounting shaft (2).
), (8) and (9) are the drive side end shaft and non-drive side end shaft, respectively, and (10) are these ends. Bearings that support the shafts (8) and (9); (11) is a slip ring for supplying field current; (12) is a heat exchanger formed or placed on the torque tube (1);
13) is a side radiation shield, and (14) is a vacuum part.

In the rotor of the superconducting rotating electric machine having the above configuration,
By cooling the superconducting field coil (3) disposed on the coil mounting shaft (2) to an extremely low temperature, the electrical resistance becomes zero and excitation loss is eliminated. ) to generate a strong magnetic field, and a stator (not shown) to generate alternating current power. 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 tube (not shown).
The liquid helium is supplied to a liquid helium container portion formed by a helium outer cylinder (6) and a helium end plate (7). On the other hand, the inside of the rotor is kept in a high vacuum by the vacuum section (14), and
Cryogenic superconducting field coil (3) and coil mounting shaft (2)
The torque tube (1) that transmits rotational torque to the (1) is made of a thin-walled cylinder, and a heat exchanger (12) is provided to reduce as much as possible the heat that enters the cryogenic part through this torque tube (1). Additionally, a side radiation shield (13) is provided to reduce heat entering due to radiation from the sides.

On the other hand, the normal temperature damper (4) and the low temperature damper (5) shield the harmonic magnetic field from the stator, and the superconducting field coil (
3) and has the function of damping rotor vibrations caused by disturbances in the power system.
) functions as a vacuum outer cylinder, and the low-temperature damper (5) also functions as a radiation shield for the helium container. still,
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.

FIG. 5 shows a cross-sectional view taken along the V-v line in FIG.
In the figure, (15) is the wedge, (18) is the coil mounting shaft (
2) a slot formed in the axial direction on the surface, (19) an insulating spacer in the slot, (20) an upper insulating spacer, -
It is sa. In this configuration, the superconducting field coil (3)
is wound around the A-A wire, so
A strong magnetic field is generated with the A-A line as the pole center. fll
l (15) is the superconducting field coil (3) inserted into the slot (18
) is hammered in to hold it firmly in place.

Fig. 6 is a perspective view showing the end of the coil mounting shaft, and Fig. 7 is a perspective view showing the end of the coil mounting shaft.
This is a sectional view taken along the line ■-■ in the figure. In Figures 6 and 7, (21) is the lower insulating spacer, (22) is the slot (18) of the coil mounting shaft (2) and the coil mounting shaft (2).
) Liquid helium reservoir inside the shaft center (not shown)
This is a helium flow hole provided in communication with the

The slot (18) is a linear slot along the axial direction on the shaft surface of the coil mounting shaft (2), an arc slot along the circumferential direction at both ends of the shaft, and a corner slot connected to the straight slot and the arc slot. It is configured. Therefore, the wedge (15) is shaped according to these slots, and after storing the superconducting field coil (3) in the slot (18), the wedge (15) is inserted into the slot (18) and the superconducting field coil is inserted into the slot (18). It holds the coil (3) firmly.

As a superconducting field coil used in such a rotor, for example, there is one disclosed in Japanese Unexamined Patent Publication No. 186960/1983, and its configuration is shown in FIG.
3a) is a superconducting wire formed by twisting a plurality of superconducting strands, and is wound in multiple rows and in multiple layers.
(23) is the inter-row insulation inserted between these superconducting II (3 m) rows, and (24) is the glabellar insulation inserted between the Q layers of superconducting wire (3a). In addition, superconducting field coil (3)
has one superconducting wire (3a), and has one superconducting wire (3a).
a) Winding while inserting inter-row insulation (23) between the rows and glabellar insulation (24) between the eyebrows of the superconducting wire (3a), and after winding, treat with epoxy resin and form into a mold shape. This prevents the superconducting wire (3a) from shorting.

[Problems to be Solved by the Invention] However, in the rotor of the conventional superconducting rotating electrical machine described above, the wedge (15) that firmly holds the superconducting field coil (3) has a shape corresponding to each shape of the slot (18). In particular, the shape of the wedges (15) arranged at both ends of the coil mounting shaft (2) has a complicated shape, and there is a problem in that it requires a great deal of labor to manufacture, process, and drive. Ta.

This invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a rotor for a superconducting rotating electrical machine that can firmly hold a superconducting field coil without requiring much effort. With the goal.

[Means to solve the problem]

The method for manufacturing a rotor of a superconducting rotating electric machine according to the present invention includes:
A superconducting field coil is installed in the slot, and then an upper insulating material is placed on the outer circumferential side of the superconducting field coil in a state protruding from the outer circumferential surface of the coil mounting shaft, and then the surface of the upper insulating material is processed. Then, the protruding upper insulating material is pushed into the superconducting field coil by applying surface pressure to the superconducting field coil by the cylindrical body, and the cylindrical body is fitted onto the coil mounting shaft.

[For production]

In the method of manufacturing a rotor for a superconducting rotating electrical machine according to the present invention, after a superconducting field coil is installed in a slot, an upper insulating material is placed on the outer circumferential side of the superconducting field coil with the upper insulating material protruding from the outer circumferential surface of the coil mounting shaft. After that, a cylindrical body is fitted onto the outer peripheral side of the coil mounting shaft, and the superconducting field coil is fixed to the coil mounting shaft by receiving a predetermined surface pressure from the upper insulating material.

〔Example〕

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

FIGS. 1 to 3 FM show one embodiment of the present invention, and the same or corresponding parts as in FIGS. 4 to 8 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, (2a) is a cooling path for liquid helium, which is a refrigerant, formed on the outer periphery of the coil mounting shaft (2), and (25)
is a superconducting field coil installed in the slot (18), and is formed by winding multiple rows and multiple layers of superconducting wire (25 m). (26) is a superconducting field coil (25
) is a semi-cured insulating tape impregnated with resin that is spirally wound around a superconducting wire (25 m) and cured after winding. (27) is formed in the gap between this insulating tape (26). Cooling path, (28) is superconducting field coil (25)
The lower insulating material is installed between the bottom surface of the slot (18) and the cooling passage (28 m) that extends in the axial direction and is connected to the helium flow hole (22). A continuous radial cooling path (28b) and a cooling path (28b)
A circumferential cooling path (28c) is formed which is connected to the cooling path (28b), and the cooling path (27) and the helium flow hole (22) are connected to the cooling path (28m), (28b), and (28e).
). (29) is an upper insulating material disposed on the outer circumferential side of the superconducting field coil (25),
A circumferential cooling path (29a) connected to the cooling path (2a) of the coil mounting shaft (2), a radial cooling path (29b) connected to this cooling path (29JL), and a radial cooling path (29b) connected to this cooling path (29JL); 29
A cooling passage (29c) in the circumferential direction is formed which is continuous with the cooling passage (29c), and the cooling passage (2a) and the cooling passage (27) are these cooling passages (29m).

(29b) and (29e) are connected to each other. (
30) is a superconducting field coil (25) and a slot (18)
This is an insulating material in the slot installed between the slot and the wall surface of the slot, and a cooling path (30a) is formed therein. The superconducting field coil (31) is fitted onto the outer circumferential side of the coil mounting shaft (2) by, for example, shrink fitting, and is installed in the slot (18).
25) through the slot (18) through the upper insulation (29)
It is a cylindrical body that is firmly held inside.

Moreover, (32) is the amount of protrusion from the outer peripheral surface of the coil mounting shaft (2) after processing the outer surface of the upper insulating material (29).

Next, the operation will be explained. Attach the lower insulating material (28) to the bottom of the slot (18) of the coil attachment shaft (2), and the insulating material (30) in the slot to both walls of the slot (18).1 Next, attach the resin to the superconducting wire (25 m). The impregnated semi-cured insulating tape (26) is spirally wound to form a superconducting field coil (25) (slot) (18).
). Then, an upper insulating material (29) is provided on the outer peripheral side of the superconducting field coil (25).

The resin of the insulating tape (26) hardens on the coil mounting shaft (2).
This is done by rotating heating. Upper insulation material after curing (29
), but this lathe processing only processes the upper insulating material (29), and the coil mounting shaft (
The protrusion amount (3) of the upper insulating material (29) from the coil mounting shaft (2) was
2), and this protrusion amount (32) is set in advance so as to apply a predetermined surface pressure to the upper surface of the superconducting field coil (25) when the cylindrical body (31) is fitted.

After machining with a lathe, the cylindrical body (31) is fitted onto the outer circumferential side of the coil mounting shaft (2) by shrink fitting, and the superconducting field coil (25) is inserted into the slot (1) through the upper insulating material (29).
8) Hold firmly within.

At this time, the lathed outer peripheral surface of the upper insulating material (29) is pressed down by the inner surface of the cylindrical body (31) and coincides with the outer surface of the coil mounting shaft (2), and the superconducting field coil (25)
A predetermined surface pressure is applied to the

As described above, by shrink-fitting the cylindrical body (31) to the outer circumferential side of the coil mounting shaft (2), the superconducting field coil (25) can be firmly held within the slot (18). There is no need to use a wedge (15) with such a complicated shape, and the manufacturing process and driving work are completely eliminated. Further, a wedge groove for inserting the wedge (15) into the slot (1B) is also unnecessary. Furthermore, by omitting the wedge (15), the outer diameter can be reduced by its thickness, and the outer surface of the coil mounting shaft (2) can be machined after the resin of the superconducting field coil (25) has hardened. So,
No need to adjust the coil height.

Further, the superconducting wire (25a) of the superconducting field coil (25) is cooled as follows. Coil mounting shaft (2)
Liquid helium is supplied through the cooling path (2a) formed on the outer periphery of the radial cooling path (30 m) formed by the insulating material (29) in the slot and the upper insulating material (29).
It flows into the cooling path (29m). The liquid helium that has flowed into the cooling path (29m) flows into the cooling path (29b) and passes through the cooling path (29a) to the cooling path formed by forming an insulating tape (26) in a spiral shape on the superconducting wire (25m+). (2)). These cooling channels (27).

The superconducting wire (25 m) is directly cooled by flowing liquid helium through the superconducting wire (30 m). After cooling the superconducting wire (25m), the liquid helium flows through the cooling path (28e), (
28b).

(28m) and flows out to the helium flow hole (22).

〔Effect of the invention〕

As explained above, according to the method of manufacturing a rotor for a superconducting rotating electric machine of the present invention, the superconducting field coil installed in the slot of the coil mounting shaft is firmly fixed by the cylindrical body fitted on the outer circumferential side of the coil mounting shaft. There is no need to use a wedge with a complicated shape, and there is no need to manufacture or drive the wedge, which significantly improves work efficiency and provides excellent economical effects. Further, by arbitrarily changing the amount of protrusion of the upper insulating material from the coil mounting shaft, it is possible to freely change the required surface pressure for fixing the superconducting field coil to the coil mounting shaft.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a front view of the superconducting wire shown in FIG. 1, and FIG. 3 is a sectional view showing the state of the upper insulating material shown in FIG. 1 after surface processing. , Fig. 4 is a sectional view showing an example of a rotor of a conventional superconducting rotating electric machine, and Fig. 5 is a sectional view showing an example of a rotor of a conventional superconducting rotating electric machine.
6 is a perspective view of the main part of FIG. 4, FIG. 7 is a sectional view taken along line ■-■ of FIG. 6, and FIG. 8 is a superconducting diagram of FIG. 7. FIG. 3 is a cross-sectional view of a field coil. In the figure, (2) is a coil mounting shaft, (18) is a slot, (25) is a superconducting field coil, (29) is an upper insulating material, and (31) is a cylindrical body. In each figure, the same reference numerals indicate the same or corresponding parts. 31 - Cylinder Body Original 7 Figure Procedural Amendment Case Display Japanese Patent Application No. 63-320424 Name of the Invention Relationship with the Person Amending the Manufacturing Method of the Rotor of a Superconducting Rotating Electric Machine Case Patent Applicant Address Marunouchi, Chiyoda-ku, Tokyo 2-2-3 Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki

Claims (1)

[Claims] (1) A coil mounting shaft with a slot formed on the outer periphery;
A superconducting field coil installed in this slot and formed by winding multiple rows and layers of superconducting wire, and a superconducting field coil fitted on the outer peripheral surface of the coil mounting shaft are connected to each other through an upper insulating material. A method for manufacturing a rotor for a superconducting rotating electrical machine, comprising: a cylindrical body held in the slot; the superconducting field coil being installed in the slot; and then the upper insulating material being placed on the outer circumferential side of the superconducting field coil. The coil is arranged so as to protrude from the outer peripheral surface of the coil mounting shaft, and then the surface of the upper insulating material is processed, and then the protruding upper insulating material is applied with surface pressure to the superconducting field coil by the cylindrical body. 1. A method for manufacturing a rotor for a superconducting rotating electrical machine, characterized in that the cylindrical body is fitted onto a coil mounting shaft by pushing the rotor.