JP2537292B2 - Method for manufacturing rotor of superconducting rotating electric machine - Google Patents

Description

The present invention relates to a rotor for a superconducting rotating electric machine, and more particularly to a rotor for a superconducting rotating electric machine having an improved structure for holding a superconducting field coil on a coil mounting shaft. It is about the method.

[Prior Art] Conventionally, as a rotor of a superconducting rotary electric machine of this type, for example, there is one shown in Fig. 5 disclosed in JP-A-61-18846. In FIG. 5, the superconducting field coil (3) is fixed to the coil mounting shaft (2) forming the central portion of the torque tube (1). A coil which surrounds the torque tube (1) and the coil mounting shaft (2) and is provided with a room temperature damper (4) and a low temperature damper (5) between the room temperature damper (4) and the coil mounting shaft (2). A helium outer cylinder (6) and a helium end plate (7) are attached to the outer peripheral portion and the side surface portion of the mounting shaft (2), respectively. (8) and (9) are end shafts on the driving side and the non-driving side, respectively, which are supported by a bearing (10). (11) is a slip ring for supplying a field current, (12) is a heat exchanger provided in the torque tube (1), (13) is a side radiation shield, (14)
Is a vacuum section.

With the above configuration, the superconducting field coil (3) arranged on the coil mounting shaft (2) is cooled to an extremely low temperature to bring the electric resistance to zero and eliminate the excitation loss. A strong magnetic field is generated in the field coil (3), and AC power is generated in the stator (not shown).
In order to cool and maintain the superconducting field coil (3) at an extremely low temperature, liquid helium is introduced from a central portion of the anti-drive side shaft (9) through an introduction pipe (not shown) to the helium outer cylinder (6) and helium. While supplying to the liquid helium container part formed by the end plate (7), the inside of the rotor is kept in a high vacuum by the vacuum part (14), and the cryogenic superconducting field coil (3) and the coil mounting shaft (2) are provided. The most common structure is that the torque tube (1) for transmitting the rotational torque is a thin cylinder and a heat exchanger (12) is provided to reduce the heat entering the cryogenic part through this torque tube (1). is there. Further, a side radiation shield (13) is provided in order to reduce heat entering by radiation from the side surface.

On the other hand, the room temperature damper (4) and the low temperature damper (5) are
In addition to having the function of shielding the harmonic magnetic field from the stator, protecting the superconducting field coil (3), and attenuating the rotor vibration due to the disturbance of the power system, the room temperature damper (4) is a vacuum outer cylinder. Function, low temperature damper (5)
Also functions as a radiation shield for the helium container. In FIG. 5, the helium introduction / exhaust device connected to the helium introduction / exhaust system piping and the rotor is omitted in FIG.

Next, in FIG. 6, (15) is a wedge, (18) is a slot formed in the axial direction on the surface of the coil mounting shaft (2),
(19) is an insulating spacer in the slot, and (20) is an upper insulating spacer.

The same reference numerals as those in FIG. 5 denote the same parts.

In this configuration, the superconducting field coil (3) is A-
It is wound so as to surround the A line, and therefore A-A
A strong magnetic field is generated with the line as the pole center. The wedge (15) is driven into the slot (18) to securely hold the superconducting field coil (3).

7 and 8, (21) is a lower insulating spacer, (22) is a slot (18) of the coil mounting shaft (2).
And a helium flow hole provided in communication with a liquid helium liquid reservoir (not shown) inside the axis of the coil mounting shaft (2). In addition, the same reference numerals as those in FIGS. 5 and 6 are the same parts.

The slot (18) includes a linear slot along the axial direction on the surface of the coil mounting shaft (2), arc slots along the circumferential direction at both ends of the shaft, and the linear slot and the arc slot. And a corner slot that communicates with. Therefore, the wedge (15) has a shape corresponding to the slots, the superconducting field coil (3) is housed in the slot (18), and then the wedge (15) is inserted into the slot (18) to attach the superconducting field coil. Holds the coil (3) firmly.

As a superconducting field coil (3) used for such a rotor, there is one disclosed in, for example, Japanese Patent Laid-Open No. 186960/1982, and its construction is shown in FIG. In the figure, a superconducting wire (3a) formed by twisting a plurality of superconducting element wires is wound in a plurality of rows and a plurality of layers. Inter-row insulation (23) is inserted between the rows of these superconducting wires (3a),
Interlayer insulation (24) is inserted between the layers of the superconducting wire (3a). In addition, the superconducting field coil (3) is
a) and has a row of superconducting wires (3a) with inter-row insulation (23) between the rows and superconducting wires (3a) with inter-layer insulation (24) inserted between them. After winding, it is treated with epoxy resin to be molded into a superconducting wire (3
The short-circuit prevention process of a) is performed.

[Problems to be Solved by the Invention] In the rotor of the conventional superconducting rotating electric machine as described above, the wedge (15) that firmly holds the superconducting field coil (3) depends on the shape of each part of the slot (18). In particular, the wedges (15) arranged at both ends of the coil mounting shaft (2) have complicated shapes, and a great deal of labor is required for manufacturing and driving them. There was a problem that

The present invention has been made to solve the above problems, and an object thereof is to obtain a method of manufacturing a rotor of a superconducting electric rotating machine that can firmly hold a superconducting field coil without requiring a great deal of labor. To do.

[Means for Solving the Problem] In the method for manufacturing a rotor of a superconducting rotary electric machine according to the present invention, the coil insulating material is manufactured in advance so as to protrude from the surface of the coil mounting shaft, and the protruding upper insulating material is used. A marking line is marked on the side circumference of the upper insulating material to indicate that it coincides with the outer circumference of the coil mounting under a load equal to that applied by the fitting of the cylinder from the outside. After that, the external load applied to the upper insulating material is removed, the upper insulating material is removed from the slot, and then the upper portion is machined to the marking line position. Then, the upper insulating material is mounted again in the slot and the cylindrical body is fitted.

[Operation] In the present invention, when the cylindrical body is fitted on the outer peripheral side of the coil mounting shaft, a predetermined surface pressure intended by design is applied within a certain accuracy to the upper insulating material.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
The same symbols as those in FIGS. 5 to 9 are the same parts. 1 to 3, a cooling passage (2a) for liquid helium is formed on the outer peripheral portion of the coil mounting shaft (2). Reference numeral (25) is a superconducting field coil fitted in the slot (18), and the superconducting wire (25a) is formed by winding a plurality of rows and a plurality of layers. The superconducting wire (25a) of the superconducting field coil (25) is spirally spirally insulated (26).
Is wound, and a cooling path (27) is formed in the space between the spiral insulations (26). Reference numeral (28) is a lower insulating material mounted between the superconducting field coil (25) and the bottom surface of the slot (18), and is an axially extending cooling path (28a) communicating with the helium flow hole (22). ), A radial cooling passage (28b) communicating with the cooling passage (28a), and a circumferential cooling passage (28c) communicating with the cooling passage (28b) are formed, and the cooling passage (27) And the helium flow hole (22) communicate with each other through these cooling paths (28a), (28b), (28c).
(29) is an upper insulating material arranged on the outer peripheral side of the superconducting field coil (25), and is a cooling path (2a) of the coil mounting shaft (2).
A cooling path (29a) communicating with the cooling path (29a), an axial cooling path (29b) communicating with the cooling path (29a), and a circumferential cooling path (29c) communicating with the cooling path (29b). The cooling passage (2a) and the cooling passage (27) are connected to the cooling passages (29a), (2
It is connected via 9b) and (29c). (30) is an insulating material inside the slot mounted between the superconducting field coil (25) and the wall surface of the slot (18).
A cooling path (30a) is formed on the 5) side. Cylindrical body (31)
Is a superconducting field coil (25) fitted into the outer periphery of the coil mounting shaft (2) by, for example, shrink fitting, and the superconducting field coil (25) mounted in the slot (18) is inserted through the upper insulating material (29) into the slot (18).
Holds firmly inside.

Next, the assembling procedure will be described. In FIG. 4, (32) is a marking needle for marking the outer peripheral position of the coil mounting shaft on the side circumference of the upper insulating material (29) before fitting the cylindrical body (31), and (33) is The marking line on the side of the upper insulating material marked by this marking needle.
Reference numeral (34) is a pressing device for applying a predetermined surface pressure by pushing the top portion of the upper insulating material (29). (29d) is the upper insulation (2
It is a machining allowance that is added in advance to 9).

First, the lower insulating material (28) is attached to the bottom surface of the slot (18) of the coil mounting shaft (2), and the in-slot insulating material (30) is attached to both wall surfaces of the slot (18). Next, superconducting wire (25a)
A superconducting field coil (25) in which a spiral insulation (26) is spirally wound is installed in the slot (18). Then, on the outer peripheral side of the superconducting field coil (25), the upper insulating material (2
9) Place.

The resin of the spiral insulation (26) is cured by rotary heating.

After this rotation heating, the press device (34) is placed outside the upper insulating material (29) to apply a load to the upper insulating material (29). This load can be freely adjusted by the press device (34) and is set to be equal to the surface pressure received by the upper insulating material (29) when the cylindrical body (31) is fitted.

Next, a scribe line (33) is marked on the side circumference of the upper insulating material (29) using a scribe needle (32). Scribing line (33)
After marking, the upper insulating material (29) is removed from the slot (18) for machining, and the scribing line (33) is used to scrape off the upper machining allowance (29d). afterwards,
The upper insulating material (29) is fitted into the slot (18) again, and then the cylindrical body (31) is shrink-fitted to the coil mounting shaft (2).
Superconducting field coil (25)
Is firmly held in the slot (18) through the upper insulating material (29).

Since the superconducting field coil (25) can be firmly held in the slot (18) by shrink-fitting the cylindrical body (31) on the outer peripheral side of the coil mounting shaft (2) as described above, It is not necessary to use the complicated wedge (15) having such a shape at all, and there is no manufacturing work and driving work. Further, the conventional mechanism for inserting the wedge (15) into the slot (18) is not required. Further, by omitting the wedge (15), the outer diameter can be reduced by the thickness dimension.

Next, the superconducting wire (25a) of the superconducting field coil (25) is cooled as follows. Liquid helium is supplied through the cooling passage (2a) formed on the outer peripheral side of the coil mounting shaft (2), and the radial cooling passage (30a) formed by the in-slot insulating material (30) and the upper insulating material (29) Flows into the cooling passage (29a) of. The liquid helium that has flowed into the cooling path (29a) flows into the cooling path (29b), passes through the cooling path (29c), and then flows into the cooling path (27) formed by the spiral insulation (26) in the superconducting wire (25a). These cooling channels (27), (30
When liquid helium flows through a), the superconducting wire (25
a) is directly cooled. The liquid helium after cooling the superconducting wire (25a) flows out to the helium flow hole (22) through the cooling paths (28a), (28b), (28c).

Although the cooling paths formed in the upper insulating material (29) and the lower insulating material (28) have various shapes in the above embodiment,
The upper insulating material (29) may be any cooling path that connects the cooling path (2a) and the cooling path (27), and the lower insulating material (28) may connect the cooling path (27) and the helium flow hole (22). Any cooling path will do.

EFFECTS OF THE INVENTION As is clear from the above description, the present invention firmly holds the superconducting field coil mounted in the slot of the coil mounting shaft by the cylindrical body fitted to the outer peripheral side of the coil mounting shaft. As a result, it is not necessary to use a wedge having a complicated shape at all, and there is no manufacturing work and driving work, so that workability is remarkably improved and an excellent economical effect is obtained. Further, the height of the upper insulating material is determined by marking with a scribing needle by applying a predetermined load to the top of the upper insulating material, so that the surface pressure control after fitting of the cylindrical body becomes accurate, and at the same time, the cylindrical body can be controlled. It is also possible to obtain the effect of preventing the center line mismatch between the coil mounting shaft and the coil mounting shaft.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a transverse cross-sectional view of a main part, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is III- of FIG. It is sectional drawing by the plane which follows the III line. FIG. 4 is a cross-sectional view of a main part for explaining an embodiment of the present invention. 5 to 9 show a rotor of a conventional superconducting rotating electric machine, FIG. 5 is a longitudinal sectional view, FIG. 6 is a sectional view taken along a plane along the line VI-VI in FIG. 5, and FIG. FIG. 8 is a partial perspective view, FIG. 8 is a sectional view taken along a plane along the line VIII-VIII in FIG. 7, and FIG. 9 is a partial sectional view. (2) …… Coil mounting shaft, (2a) …… Cooling path, (18)…
… Slot, (25) …… Superconducting field coil, (25a)…
… Superconducting wire, (26)… Spiral insulation, (27)… Cooling path, (28)… Lower insulation material, (29)… Upper insulation material,
(30) …… Insulator in slot, (31) …… Cylinder, (3
2) …… Scribe needle, (33) …… Scribe line, (34) …… Pressing device. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. When mounting and fixing a superconducting field coil in a slot formed on an outer peripheral portion of a coil mounting shaft through an upper insulating material, a lower insulating material and an insulating material in the slot, the upper insulating material is previously attached to the coil. The coil mounting shaft is manufactured so that it protrudes from the surface of the shaft, and a load equal to that applied from the outside by the fitting of the cylindrical body is applied to the protruding upper insulating material on the side circumference of the upper insulating material. Marking a marking line indicating that it matches the outer circumference of the above, then removing the external load applied to the upper insulating material and removing the upper insulating material from the slot, Delete to the line position by machining, then
A method for manufacturing a rotor of a superconducting rotary electric machine, wherein the upper insulating material is mounted in the upper slot again and the cylindrical body is mounted to apply a predetermined surface pressure to the upper insulating material.