JP2779399B2 - Method of manufacturing rotor for superconducting rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rotor of a superconducting rotating electric machine, and more particularly to a method of manufacturing a rotor of a superconducting rotating electric machine with an improved method of holding a superconducting field coil on a coil mounting shaft. is there.

[0002]

2. Description of the Related Art Conventionally, as a rotor of this type of superconducting rotary electric machine, there has been one shown in FIG. 5 disclosed in, for example, Japanese Patent Application Laid-Open No. 61-18846. 5, reference numeral 1 denotes a torque tube, 2 denotes a coil mounting shaft supported on both ends of the torque tube 1, 3 denotes a superconducting field coil fixed to an outer peripheral portion of the coil mounting shaft 2, 4 denotes a torque tube 1 and a coil mounting Room temperature damper 5 surrounding shaft 2 and room temperature damper 4
And a low-temperature damper provided between the coil mounting shaft 2 and the coil mounting shaft 2.

[0006] Reference numeral 6 denotes a helium outer cylinder mounted on the outer peripheral portion of the coil mounting shaft 2, 7 denotes a helium end plate mounted on the shaft end of the coil mounting shaft 2, and 8 and 9 denote driving and non-driving ends. The shafts are supported by bearings 10, respectively.
Reference numeral 11 denotes a slip ring for supplying a field current, 12 denotes a heat exchanger provided in the torque tube 1, 13 denotes an end radiation shield, and 14 denotes a vacuum part.

FIG. 6 is a sectional view of a main part of the coil mounting shaft 2 of FIG. 5, and FIG. 7 is a perspective view of a main part of the coil mounting shaft 2 of FIG. In the drawing, reference numeral 18 denotes a slot formed on the outer peripheral portion of the coil mounting shaft 2 in the axial direction, and the slot in which the superconducting field coil 3 is mounted. Reference numeral 15 denotes a wedge driven into the opening of the slot 18.

FIG. 8 is an enlarged sectional view showing a portion of the slot 18 in FIG. In the figure, 19 is a slot 18
Insulation spacer in the slot arranged along the side of
0 is an upper insulating spacer disposed between the superconducting field coil 3 and the wedge 15 in the slot 18;
A lower insulating spacer 22 disposed at the bottom of the inside is a helium flow hole provided in communication with the slot 18 and a liquid helium reservoir (not shown) inside the axis of the coil mounting shaft 2.

A superconducting field coil 3 used in such a rotor is disclosed, for example, in Japanese Patent Laid-Open No. 57-1869.
There is one disclosed in Japanese Patent Publication No. 60, and its configuration is shown in FIG. In the figure, a plurality of superconducting wires 3a formed by twisting a plurality of superconducting wires are wound in a plurality of rows and a plurality of layers. Inter-column insulation 23 is inserted between the rows of these superconducting wires 3a, and interlayer insulation 24 is inserted between the layers. In addition,
When manufacturing the superconducting field coil 3, one row of the superconducting wire 3a is wound while inserting the inter-row insulation 23 and the interlayer insulation 24, and after the winding, it is treated with an epoxy resin and molded into a mold. Thus, a short-circuit preventing process for the superconducting wire 3a is performed.

Next, the operation will be described. By cooling the superconducting field coil 3 disposed on the coil mounting shaft 2 to a very low temperature and setting the electric resistance to zero, there is no excitation loss, and the superconducting field coil 3 has a strong field. Occurs, and AC power is generated in the stator (not shown).

At this time, in order to cool and maintain the superconducting field coil 3 at an extremely low temperature, the helium outer cylinder 6 and the helium end plate are passed through the introduction pipe (not shown) from the center of the non-drive end shaft 9. While the liquid helium is supplied to the liquid helium container section formed by 7, the inside of the rotor is maintained at a high vacuum by the vacuum section 14. Further, the torque tube 1 for transmitting the rotational torque to the cryogenic superconducting field coil 3 and the coil mounting shaft 2 is a thin-walled cylinder, and a heat exchanger 12 is provided. A reducing structure is used. Further, an end radiation shield 13 is provided to reduce heat entering by radiation from the shaft end.

On the other hand, the normal temperature damper 4 and the low temperature damper 5
It has a function of shielding a high-frequency magnetic field from the stator, protecting the superconducting field coil 3, and attenuating rotor vibration caused by disturbance in the power system. In addition, the normal temperature damper 4 has a function as a vacuum outer cylinder, and the low temperature damper 5 also has a function as a radiation shield to the helium container. In FIG. 5, the helium introduction / discharge device connected to the helium introduction / exhaust system and the rotor inside the rotor is omitted.

Next, in FIG. 6, the superconducting field coil 3
Is wound around the line AA, and therefore generates a strong magnetic field around the line AA. Further, the wedge 15 is driven so as to firmly hold the superconducting field coil 3 in the slot 18.

Further, in FIGS. 7 and 8, a slot 18 is provided on the shaft surface of the coil mounting shaft 2 and includes a straight slot along the axial direction, and an arc slot along the circumferential direction at both ends. , And a corner slot between the straight slot and the arc slot. Therefore, the wedges 15 are shaped according to the slots,
After the superconducting field coil 3 is housed therein, the wedge 15 is inserted into the slot 18 to hold the superconducting field coil 3 firmly.

However, in such a rotor of the conventional superconducting rotary electric machine, it is necessary to match the shape of the wedge 15 with the shape of each part of the slot 18, and in particular, the wedges 15 arranged at both ends of the coil mounting shaft 2 are required. The shape becomes complicated, and a great deal of labor is required for the manufacturing process and the driving operation. Further, since the superconducting field coil 3 is cooled only from the outer peripheral surface thereof, the superconducting field coil 3 is cooled.
When heat is generated in the internal superconducting wire 3a, the heat of the superconducting wire 3a is transferred to the inter-column insulation 23, the interlayer insulation 24, and other superconducting wires 3a.
The superconducting field coil 3 is cooled and removed by helium on the outer periphery of the superconducting field coil 3 via heat conduction, and the cooling efficiency is poor, the temperature of the superconducting wire 3a rises, and superconducting breakdown (quench) may occur. .

On the other hand, conventionally, a superconducting field coil is held in a slot by fitting a cylindrical body to an outer peripheral portion of a coil mounting shaft by shrink fitting or the like, and a superconducting wire of the superconducting field coil is attached to the superconducting wire. A rotor of a superconducting rotary electric machine having a structure in which a spiral insulation is wound in a spiral shape and a cooling path is formed in a gap between the spiral insulations has been proposed.

[0014]

In the rotor of a conventional superconducting rotary electric machine in which a cylindrical body as described above is fitted to hold a superconducting field coil, a gap generated when the superconducting wire is wound is superconducting. Since it remains inside the field coil and the initial creep occurs in the superconducting field coil after the cylindrical body is fitted, the surface pressure in the slot decreases after the cylindrical body is fitted, and the superconducting field coil cannot be held firmly There was a problem that there was. Also, since the superconducting characteristics of the superconducting field coil were checked after the cylindrical body was fitted, repair work in the event of an interlayer short circuit or the like due to inadequacy due to winding work, etc. There is also a problem that a huge amount of work time is required with work such as re-shrink fitting after restoration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to suppress a decrease in surface pressure inside a slot after fitting a cylindrical body. Of the superconducting rotating electric machine, which can more reliably hold the inside of the slot, can check the superconducting characteristics of the superconducting field coil before fitting the cylindrical body, and can improve the working efficiency. It is intended to obtain a manufacturing method of the.

[0016]

According to a first aspect of the present invention, there is provided a method for manufacturing a rotor of a superconducting rotary electric machine, comprising the steps of: mounting a superconducting field coil and an insulating material around the coil in a slot; Attach the ring to the outer periphery of the coil mounting shaft, pre-press the superconducting field coil from above the insulating material with jack bolts ,
Leap is generated, and thereafter , the pressing ring is removed, and the cylindrical body is fitted on the outer peripheral portion of the coil mounting shaft.

According to a second aspect of the present invention, there is provided a method for manufacturing a rotor of a superconducting rotary electric machine, wherein a pressing ring is formed of a non-magnetic material which does not undergo brittle fracture at a cryogenic temperature, and the superconducting field coil is brought into a superconducting state in a simulated pressing state. The superconducting characteristics are checked.

[0018]

According to the first aspect of the present invention, the superconducting field coil is pre-pressed with the use of a pressing ring to eliminate unnecessary internal gaps of the superconducting field coil generated when the superconducting wire is wound, and to provide a cylindrical body. An initial creep is generated before fitting of the cylindrical body to prevent a decrease in surface pressure in the slot after fitting of the cylindrical body.

According to the second aspect of the present invention, the superconducting field coil is cooled to an extremely low temperature while an appropriate surface pressure is applied in the slot by simulated pressing, and the superconducting characteristics are confirmed before the cylindrical body is fitted. Do.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. 1 is a cross-sectional view of a main part of a rotor of a superconducting rotary electric machine according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of the superconducting wire of FIG. 1, and FIG. 3 is a line III-III of FIG. FIG. 10 is a sectional view taken along the arrow line, and the same or corresponding parts as in FIGS. 5 to 9 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 2a denotes a liquid helium cooling passage formed on the outer peripheral portion of the coil mounting shaft 2, 25 denotes a superconducting field coil fitted in the slot 18, and a plurality of superconducting wires 25a It is formed by layer winding. The superconducting wire 25a of the superconducting field coil 25 has
As shown in the figure, a spiral insulation 26 is wound in a spiral shape, and a cooling path 27
Are formed.

Reference numeral 28 denotes a superconducting field coil 25 and a slot 1
8 is a lower insulating material mounted between the helium circulation hole 22 and the cooling passage 28a extending in the axial direction.
And a radial cooling passage 28 communicating with the cooling passage 28a.
b and a circumferential cooling passage 28 communicating with the cooling passage 28b.
c is formed. The cooling passages 27 between the spiral insulations 26 are formed by these cooling passages 28a, 28b, 28c.
Through the helium flow passage 22.

Numeral 29 denotes an upper insulating material mounted on the outer peripheral side of the superconducting field coil in the slot 18, which is in communication with the cooling passage 29a communicating with the cooling passage 2a of the coil mounting shaft 2 and with the cooling passage 29a. An axial cooling passage 29b and a circumferential cooling passage 29c communicating with the cooling passage 29b are formed. Further, the cooling path 27 between the spiral insulations 26
Are also connected to the cooling passage 2a via these cooling passages 29a, 29b, 29c.

Reference numeral 30 denotes a superconducting field coil 25 and a slot 1
A cooling passage 30a is formed on the side of the superconducting field coil 25, which is an in-slot insulating material mounted between the wall and the eight wall surfaces. Reference numeral 31 denotes a cylindrical body fitted to the outer peripheral portion of the coil mounting shaft 2 by, for example, shrink fitting, and firmly holds the superconducting field coil 25 mounted in the slot 18 in the slot 18 via the upper insulating material 29. doing.

FIG. 4 is a cross-sectional view of a main part of the superconducting rotary electric machine shown in FIG. In the figure, reference numeral 32 denotes a coil mounting shaft 2 before the cylindrical body 31 is fitted.
The pressing ring 33 temporarily attached to the outer peripheral portion of the upper insulating material 2 is formed through a screw hole 32a formed in the pressing ring.
9 is a jack bolt for pre-pressing the top portion, and 34 is a protective plate placed between the jack bolt 33 and the top portion of the upper insulating material 29. This protective plate 34 protects the upper insulating material 29 at the time of pre-pressing. At the same time, it serves to uniformly distribute the pressing force of the jack bolt 33 to the upper insulating material 29. 29d is the upper insulating material 29
This is a machining allowance that is added in advance to the machine.

Next, the manufacturing method will be described. First,
A lower insulating material 28 is provided on the bottom surface of the slot 18 of the coil mounting shaft 2.
Is attached, and the insulating material 3 in the slot is provided on both wall surfaces of the slot 18.
0 is attached. Next, the superconducting field coil 25 in which the spiral insulation 26 is wound around the superconducting wire 25a is inserted into the slot 1
8 Then, the upper insulating material 29 is arranged on the outer peripheral side of the superconducting field coil 25.

Thereafter, the pressing ring 32 is attached to the outer peripheral portion of the coil mounting shaft 2, and the superconducting field coil 25 is pre-pressed using the jack bolt 33 via the protection plate 34 and the upper insulating material 29. This preliminary pressing eliminates unnecessary gaps inside the superconducting field coil 25 generated when the superconducting wire 25a is wound. Further, since the resin of the spiral insulation 26 is cured by rotational heating, initial creep occurs in the superconducting field coil 25 by performing pre-pressing again as described above after the rotational heating.

Next, the pressing ring 32, the jack bolt 3
3. Remove the protection plate 34 and the upper insulating material 29 from the coil mounting shaft 2. The upper insulating material 29 is formed by machining the upper part
9d is removed by machining and attached to the slot 18 again. During this machining, the upper insulating material 29 calculates the amount of protrusion from the surface of the coil mounting shaft 2 so that an appropriate surface pressure is applied to the superconducting field coil 25 when the cylindrical body 31 is finally fitted. And perform machining. Then, the superconducting field coil 25 is firmly held in the slot 18 via the upper insulating material 29 by fitting the cylindrical body 31 to the outer peripheral portion of the coil mounting shaft 2 by shrink fitting or the like.

In such a rotor of a superconducting rotating electric machine,
The cylindrical body 31 is fitted to the outer peripheral portion of the coil mounting shaft 2 by shrink fitting or the like, and the superconducting field coil 25 is finally inserted into the slot 1.
Since it can be held firmly in the housing 8, there is no need to use a complicated wedge 15 having a conventional shape at all, and there is no need for manufacturing and driving the wedge. Further, a mechanism for inserting the conventional wedge 15 into the slot 18 becomes unnecessary. further,
By omitting the wedge 15, the outer diameter of the coil mounting shaft 2 can be reduced by the thickness dimension.

On the other hand, the superconducting wire 2 of the superconducting field coil 25
Cooling of 5a is performed as follows. That is, the liquid helium supplied through the cooling passage 2 a formed on the outer peripheral side of the coil mounting shaft 2 flows into the radial cooling passage 30 a formed by the in-slot insulating material 30 and the cooling passage 29 a of the upper insulating material 29. I do. The liquid helium flowing into the cooling passage 29a flows into the cooling passage 29b, and then flows through the cooling passage 29c into the cooling passage 27 formed by the spiral insulation 26 in the superconducting wire 25a. The superconducting wire 25a is directly cooled by flowing the liquid helium through the cooling passages 27 and 30a. The liquid helium after cooling the superconducting wire 25a flows through the cooling passages 28a, 28b, and 28c to the helium flow hole 22. As described above, since the superconducting wire 25a is directly cooled by the liquid helium, the cooling efficiency is significantly improved, and the occurrence of superconducting breakdown is prevented.

In the method for manufacturing a rotor of a superconducting rotary electric machine as described above, since the preliminary pressing using the pressing ring 32 is performed, the inside of the superconducting field coil 25 generated when the superconducting wire 25a is wound is formed. Can be eliminated, and the initial creep can be generated in the superconducting field coil 25 before the cylindrical body 31 is fitted. As a result, the surface pressure inside the slot 18 after the cylindrical body 31 is fitted can be reduced. It can be minimized.

In the first embodiment, the upper insulating material 29,
Although the cooling path formed in the lower insulating material 28 has various shapes, it is sufficient that at least the upper insulating material 29 has a cooling path that connects the cooling path 2a and the cooling path 27. It is sufficient if there is a cooling path that connects the cooling path 27 and the helium flow hole 22.

Embodiment 2 FIG. Next, an embodiment of the invention of claim 2 will be described. In the second embodiment, it is assumed that the pressing ring 32 of FIG. 4 is made of a non-magnetic material that does not undergo brittle fracture at an extremely low temperature, such as stainless steel. And the pressing ring 3
2, an appropriate surface pressure is applied to the superconducting field coil 25.
In this manner, the coil mounting shaft 2 is cooled to a very low temperature while the superconducting field coil 25 is simulated and pressed, and the superconducting field coil 25 can be brought into the superconducting state.

Therefore, at the time of the simulated pressing, the superconducting field coil 2
5 can apply a superconducting current to the superconducting field coil 25 by applying an external voltage to the cylindrical body 3.
The superconducting characteristics of the superconducting field coil 25 can be ascertained before the fitting of 1. That is, by providing a step of checking the superconducting characteristics before the cylindrical body 31 is fitted, the quality of the rotor can be improved, and the labor for attaching and detaching the cylindrical body 31 many times can be omitted, and the working efficiency can be reduced. Can be enhanced.

[0035]

As described above, according to the present invention, a manufacturing method of the rotor of the superconducting rotating electrical machine of the invention of claim 1, the row pre-pressing before fitting of the cylinder by using the pressure ring <br/> the Ukoto eliminate internal unwanted gaps ultra <br/> conducting field coil, and had to so that to generate an initial creep super conductive <br/> Shirubekai磁coil
Thus, a decrease in the surface pressure inside the slot after fitting the cylindrical body can be minimized, and the superconducting field coil can be more reliably held in the slot, and the reliability can be improved. It works.

According to a second aspect of the present invention, there is provided a method for manufacturing a rotor of a superconducting rotary electric machine, wherein a pressing ring is formed of a non-magnetic material which does not undergo brittle fracture at a cryogenic temperature, and a superconducting field coil is driven in a simulated pressing state. and then, because to perform the confirmation of its superconducting properties, before fitting of the circular cylinder can check the superconducting characteristics of the superconducting field coil, an effect that it is possible to improve the workability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a rotor of a superconducting rotary electric machine according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of the superconducting wire of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a cross-sectional view of a main part showing a state during the manufacture of the rotor of the superconducting rotary electric machine of FIG. 1;

FIG. 5 is a longitudinal sectional view showing an example of a rotor of a conventional superconducting rotating electric machine.

FIG. 6 is a sectional view of a main part of the coil mounting shaft of FIG. 5;

FIG. 7 is a perspective view of a main part of the coil mounting shaft of FIG. 5;

FIG. 8 is an enlarged sectional view showing a slot part of FIG. 6;

FIG. 9 is a cross-sectional view illustrating an example of a conventional superconducting field coil of a rotor.

[Explanation of symbols]

 2 Coil mounting shaft 18 Slot 25 Superconducting field coil 25a Superconducting wire 26 Spiral insulation 28 Lower insulating material 29 Upper insulating material 30 Inslot insulating material 31 Cylindrical body 32 Press ring 33 Jack bolt

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 55/04 ZAA

Claims (2)

(57) [Claims] A superconducting field coil formed by winding a plurality of spirally insulated superconducting wires in a plurality of rows and a plurality of layers is mounted in a slot formed on an outer peripheral portion of a coil mounting shaft. Mounting an insulating material around the superconducting field coil, attaching a pressing ring having a jack bolt to an outer peripheral portion of the coil mounting shaft, and preliminarily reserving the superconducting field coil from above the insulating material with the jack bolt. Press above
A step of generating initial creep in the superconducting field coil , and after removing the pressing ring from the coil mounting shaft, a cylindrical body is fitted to an outer peripheral portion of the coil mounting shaft, and the superconducting field coil is placed in the slot. A method for manufacturing a rotor of a superconducting rotating electrical machine, the method comprising: 2. A superconducting field coil formed by winding a plurality of spirally insulated superconducting wires in a plurality of rows and a plurality of layers is mounted in a slot formed on an outer peripheral portion of a coil mounting shaft. A step of mounting an insulating material around the superconducting field coil of the above, mounting a pressing ring made of a non-magnetic material having a jack bolt and not brittle in a cryogenic state on the outer periphery of the coil mounting shaft, and using the jack bolt A step of simulating the superconducting field coil from above the insulating material, cooling the superconducting field coil to a cryogenic temperature in a state where the simulated pressing is performed to a superconducting state, and a superconducting property of the superconducting field coil. A step of performing confirmation, and after removing the pressing ring from the coil mounting shaft, a cylindrical body is fitted to an outer peripheral portion of the coil mounting shaft, and the superconducting field coil is removed. The rotor manufacturing method of a superconducting rotating electrical machine, characterized by comprising the step of finally firmly retained in serial slot.