JPS6118351A - Rotor of superconductive rotary electric machine - Google Patents

Abstract

PURPOSE:To effectively hold a superconductive field coil of a stepped slot by disposing the second supporting member formed with a wedge groove in the stepped slot at the arc portion of the coil to be secured to a coil mounting shaft. CONSTITUTION:The first supporting member 23 is secured by a clamping member 24 to a coil mounting shaft 2, a retainer 25 is disposed on the member 23 to hold the corner of the coil 3. A wedge 15 is secured to the shaft 2 to press in a radial inward direction. The second supporting member 28 formed with a wedge groove in the stepped slot 18 is disposed adjacent to the arc portion of the coil 3, and the member 28 is secured by a clamping member 29 to the shaft 2. Thus, the coil 3 can be rigidly held without using a retaining ring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotor of a superconducting rotating electrical machine, and particularly to a structure for holding a superconducting field coil on a coil mounting shaft.

[Conventional Ω technology]

Conventionally, there has been a rotor shown in FIG. 1 as a general rotor of this type. In Figure 1, (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 A room-temperature damper surrounding the shaft (2), (5) a low-temperature damper disposed between the room-temperature damper (4) and the coil mounting shaft (2), and (6) and (7) the coil mounting shaft (
2), the helium outer cylinder and helium end plate attached to the outer periphery ml and the side surface, respectively, (8) and (9) are the drive side and non-drive side end shafts, respectively, and (10) are these end shafts ( 8).

(9) is a bearing that supports the shaft, 0]) is a slip ring for supplying field current, @ is a heat exchanger formed or placed on the torque tube (1), (to) is a side radiation shield, α
→ is the 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 is brought to a koto state, and by eliminating column magnetic loss, this superconducting field coil ( 3) Generate a strong magnetic field in the stator (not shown) to generate alternating current power 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 tube (not shown).
The liquid helium is supplied to the liquid helium container formed by the helium outer cylinder (6) and the helium end plate (7), while the inside of the rotor is kept in a high vacuum by the vacuum section (3) and a torque tube (1) that transmits rotational torque to the coil mounting shaft (2) is made of a thin-walled cylinder, and a heat exchanger 4 is provided, and this torque tube (1)
The most common structure is to minimize the amount of heat that enters the cryogenic area through Furthermore, a side radiation shield O3 is provided to reduce the heat that enters due to radiation from the side.

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.
) generally functions as a vacuum outer cylinder, and the low-temperature damper (5) also functions as a radiation shield for the helium container. In addition, 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.

The superconducting field coil (3) has a straight section 0 as shown in Figure 2.
The structure has υ, 0 arc parts, and 0 corner parts. If this superconducting field coil (3) moves during operation, the superconductivity will be destroyed due to frictional heat, so it is necessary to hold it firmly.

Also, as can be seen from Figure 1, the superconducting field coil (3) is triple-covered by a helium outer cylinder (6), a low-temperature damper (5), and a room-temperature damper (4), making inspection and repair easy. Very difficult. In particular, since high reliability is required in a rotating electrical machine, it is no exaggeration to say that the method of holding the superconducting field coil (3) is the key to the success or failure of a superconducting rotating electrical machine.

A conventional method for holding this type of superconducting field coil (3) is described in Japanese Patent Laid-Open No. 166889/1989. This holding method is as shown in Fig. 3, in which the straight part 0ρ of the superconducting field coil (3) is inserted into the straight part of the slot formed in the coil mounting shaft (2). c), and is held by the superconducting field coil (3).
) to the arc part) and the corner part (to) the coil mounting shaft (2
), and is held by a retaining ring αQ and an insulating pawl αη. Note that an insulating cover plate is provided on the inner peripheral side of the retaining ring Q6.

FIG. 4 is a sectional view taken along the ff-IT line in FIG. 1, that is,
A circumferential cross-sectional view of the straight section 0 of the superconducting field coil (3) is shown. In Fig. 4, (2) is the coil mounting axis, (
3) is a superconducting field coil, (c) is a wedge, and (to) is a slot formed in the axial direction on the surface of the coil mounting shaft (2), which is composed of a straight section slot and a stepped section slot. . (II is slot insulation, (A) is wedge insulation. In this configuration, the superconducting field coil (3) is A-
It is wound around the A wire, and therefore generates a strong magnetic field with the A-A wire as the pole center. The wedges are driven to firmly hold the superconducting field coils (3) within the slots. Therefore, the reliability of coil holding is high.

Also, Fig. 5 shows an axial cross-sectional view of the arc portion of the superconducting field coil (3). In Fig. 5, (1) is the torque tube, (2) is the coil mounting shaft, and (3) is the torque tube. is a superconducting field coil, (6) and (7) are a helium outer cylinder and a helium end plate, αQ is a retaining ring, α force is an insulating pawl, Qυ is an insulating bottom plate, and (a) is an insulating cover. In Figures 3 and 5, the arc part (2) and corner part (to) of the superconducting field coil (3) are housed in a stepped part formed on the coil mounting shaft (2), and insulation is provided in the gap between them. A pawl Q71 is firmly driven in, and a retaining ring αQ is further shrink-fitted thereon.

However, the arc part (2) of the superconducting field coil (3)
) and the corner part), that is, the insulating pawl O that occupies a large volume in the stepped part formed on the coil mounting shaft (2).
The amount of heat shrinkage in item 4 is about 2 degrees larger than that of the coil mounting shaft (2) and the superconducting field coil (3), and even if the insulating pawl αη is firmly driven in at the manufacturing stage at room temperature, it will not reach extremely low temperatures. When cooled, the insulating pad α force and the superconducting field coil (3)
There will be a gap between the two. Since the insulating pawl αη is not fixed to the coil mounting shaft (2), it may move.
When gaps accumulate due to the α force of the insulating pawl, the gaps become large, and therefore, the superconducting field coil (3) moves due to vibrations during operation, and there is a risk of superconductor destruction due to frictional heat. Also, superconducting field coil (3)
Holding RaQ is required to maintain the bearing against centrifugal force, making the structure complex and requiring a great deal of effort for inspection and repair.

[Summary of the invention]

This invention was made in view of the above-mentioned drawbacks of the conventional ones, and the first support member is arranged adjacent to the corner part of the superconducting field coil using a stepped slot formed on the coil mounting shaft. The first support member is fixed to the coil mounting shaft using a tightening member, and a presser foot is placed on the first support member to tighten the wedge that holds the corner portion of the superconducting field coil. A second support member, which is fixed to the coil mounting shaft so as to be pressed inward in the direction, and has a wedge groove formed in the stepped slot portion, is placed adjacent to the arc portion of the superconducting field coil, and the coil is tightened by the tightening member. By fixing to the mounting shaft,
The present invention provides a superconducting rotor that can reliably and firmly hold a superconducting field coil in a stepped slot portion with a simple structure without using a retaining ring.

[One embodiment of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 6 to 12. Figure 6 is a perspective view showing the end of the coil mounting shaft;
Figure 7 is a sectional view taken along the line ■-■ in Figure 6, Figures 8 and 9 are a plan view and front view showing the presser foot, and Figure 10 is a cross-sectional view taken along the line ■-■ in Figure 6.
FIG. 11 is a cross-sectional view taken along the line (G) in FIG. 6, and FIG. 12 is a perspective view showing the second support member. is the coil mounting axis, (3) is the superconducting field coil, 0υ is the straight part, ■ is the arc part, (to) is the corner part, OF4 is the wedge, (to) is the slot formed in the coil mounting axis (2) It is composed of a straight section slot and a stepped section slot. IJQ
(E) is the insulation in the slot, (E) is the wedge insulation, (E) is the stepped part slot part (C) and the corner part of the superconducting field coil (3) (
A first support member (E) is placed adjacent to the first support member (E) and is fixed to the coil mounting shaft (2) by a bolt (C), and (E) is placed adjacent to the first support member (E) and is secured to the coil mounting shaft (2) by a bolt (E). This is a presser foot that is fixed to the first support member (by the bolt), presses the wedge radially inward, and firmly holds the corner part of the superconducting field coil (3) (to the bolt). A bolt hole (25a) is formed through which the bolt is passed.

) is the superconducting field coil (3) in the slot part (g) of the stepped part.
) The bolt (to) placed adjacent to the arc part (2) of
a second support member fixed to the coil mounting shaft (2) and formed with a wedge groove (28a) into which a wedge groove is inserted;
A bolt hole (28b) is formed through which the bolt (2) passes. The first support member (2) is formed with a bolt hole (28a) through which the bolt (c) is passed and a large thread (28b) for the bolt.

With the above configuration, the corner part (to) of the superconducting field coil (3) is firmly held in the slot (c) by the first support member (to) and the presser foot, and the superconducting field coil (3) is held more firmly by the second support member (2). In addition, the superconducting field coil (3) is constructed by first storing the straight part 0υ and the arc part in the slot (G), and then storing the corner part (support) in the slot (G). (to) be incorporated into.

Arrange the first support member (E) adjacent to the corner part (to) of the superconducting field coil (3) in the stepped part slot part (F), and attach the first support member (E) to the bolt ( Fix this first support member Q to the coil mounting shaft (2) with the bolt (C), place the overwriting presser foot (C) on this first support member Q, fix it with the bolt (G), and then (1) radially inward and firmly hold the corner (3) of the superconducting field coil (3).

Then, the second support member (C) is placed adjacent to the arc part of the superconducting field coil (3) in the slot part (G) of the stepped part, and the second support member (C) is inserted from the bolt hole. Fix it to the coil mounting shaft (2), and insert a wedge into the wedge groove (28a) to firmly secure the arc part (a) of the superconducting field coil (3).
I am holding this. In this way, the arc part of the superconducting field coil (3) and the corner part (to) are housed in the stepped part slot (t). Since the supporting member (A) is fixed to the side of the stepped slot of the coil mounting shaft (2), the first supporting member (2)
), the second support member (c) does not move and the first
There is no accumulation of gaps caused by the movement of the supporting member (i.e., the presser foot ring, the second supporting member). That is, no gap is created around the superconducting field coil (3), the superconducting field coil (3) is prevented from moving during operation, and the superconductor is not destroyed by frictional heat.

In addition, the superconducting field coil (3) in the stepped part slot (to)
The first support member, the presser foot (c), and the second
The structure is to hold the support member at the cap wedge) and (to), so there is no need for a retaining ring αQ, and the structure is simple and easy to inspect.
(Easy to repair and highly economical).

By the way, the first supporting member), the second supporting member' (
By making the material of the coil mounting shaft (2) the same as that of the coil mounting shaft (2), the coil mounting shaft (2) is made of the same material as the material of the coil mounting shaft (2).
2), the first support member (e), and the second support member (to) are zero, and the superconducting field coil (3), the first support member (to), and the second support member (to) The generation of a gap between the superconducting field coil (3) and the supporting member (e) can be suppressed, and the reliability of the superconducting field coil (3) can be improved.

In addition, Bolt (Foundation), (E), and 4 have superconducting field coils (
3), the centrifugal force of the first support member (E), presser foot (C), and second support member (B) acts. Since the rotor of a superconducting rotating electric machine rotates at high speed, the stress on the bolts (c), (e), and (ni) becomes large. In order to reduce this stress, it is preferable to make the first support member (c), presser foot (c), and second support member (c) from titanium or a titanium alloy with relatively low specific gravity. By using the first support member (1), the presser foot (C), and the support member (A) @2, it is possible to reduce the stress acting on the bolts (C), (A), and the wire.

Furthermore, in the above embodiment, the presser foot (2) is fixed to the first support member 4 with the bolt (c), and is fixed to the coil mounting shaft (2) via the first support member). As mentioned above, by making the bolt holes of the first support member (material) and the presser foot (c) the same position and the same size, it is possible to tighten the support member @1 and the presser foot (a) in the same way. The coil mounting shaft (2) may be fixed to the coil mounting shaft (2) by a member, and the same effect as the above embodiment can be achieved.

〔Effect of the invention〕

As explained above, the present invention arranges the first support member adjacent to the corner part of the superconducting field coil in the stepped slot formed on the coil mounting shaft, and tightens the first support member. The wedge is fixed to the coil mounting shaft by a support member, and a presser foot is placed on the support member to press the wedge holding the corner portion of the superconducting field coil radially inward, and the stepped part slot is fixed to the coil mounting shaft. The second support member in which a wedge groove is formed is disposed adjacent to the arc portion of the superconducting field coil, and the second support member is fixed to the coil mounting shaft by the tightening member. The superconducting field coil can be reliably and firmly held in the stepped slot formed on the coil mounting shaft with a simple structure without using a retaining ring, ensuring reliability with no risk of superconductor destruction. It is possible to obtain a rotor for a superconducting rotating electric machine with high performance.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the overall concept of a rotor of a general super-1g conductive rotating electric machine, Figure 2 is a perspective view showing the state of the superconducting field coil in Figure 1 after winding, and Figure 8 is A perspective view showing the coil mounting shaft end of the rotor of a conventional superconducting rotating electrical machine, FIG. 4 is a sectional view taken along line ff-IV in FIG. 1, and FIG. 5 is a perspective view showing the arc portion of the conventional superconducting field coil. Figure, 6th
The figure is a perspective view showing the coil mounting shaft end of the rotor of a superconducting rotating electrical machine according to an embodiment of the present invention, and FIG.
8 and 9 are plan views and front views showing the presser foot according to the present invention, Figure 0 is a perspective view showing the support member of History 1 according to the present invention, and Figure 11 is a sectional view taken along the line XI--X in FIG. 6, and FIG. 12 is a perspective view showing the second support member according to the present invention. In the figure, (2) is the coil mounting axis, (3) is the superconducting field coil, 0η is the straight part, (to) is the arc part, Q is the corner part, (g) is the wedge, Qal is the slot, and the plow is the 1 support member, gu → tightening member, (c) presser foot, (c) wedge,
@ is the second support member, ni) is the tightening member, and (to) is the wedge. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (11)

[Claims] (1) A coil mounting shaft with a straight part slot and a stepped part slot formed on the shaft surface, a superconducting field coil housed in the slot of this coil mounting shaft, and a superconducting field coil inserted into the straight part slot. a wedge for holding a magnetic coil; and a first support disposed adjacent to a corner portion of the superconducting field coil in the stepped slot and fixed to the stepped slot of the coil mounting shaft by a tightening member. member and this first
a presser foot that is disposed on the supporting member and fixed to the coil mounting shaft and presses a wedge radially inward for holding the corner portion of the superconducting field coil; a second support member which is arranged in a manner such that it is fixed to the slot portion of the stepped portion of the coil mounting shaft by a tightening member, and has a wedge groove formed therein into which a wedge for holding the arc portion of the superconducting field coil is inserted; A rotor for a superconducting rotating electrical machine characterized by the following features: (2) A rotor for a superconducting rotating electric machine according to claim 1, wherein the first support member is made of the same material as the coil mounting shaft. (3) A rotor for a superconducting rotating electric machine according to claim 1, wherein the second support member is made of the same material as the coil mounting shaft. (4) A rotor for a superconducting rotating electric machine according to claim 1, wherein the first support member is made of titanium. (5) A rotor for a superconducting rotating electric machine according to claim 1, wherein the first support member is made of a titanium alloy. (6) A rotor for a superconducting rotating electric machine according to claim 1, wherein the second support member is made of titanium. (7) A rotor for a superconducting rotating electric machine according to claim 1, wherein the second support member is made of a titanium alloy. (8) A rotor for a superconducting rotating electric machine according to claim 1, wherein the presser foot is made of titanium. (9) A rotor for a superconducting rotating electric machine according to claim 1, wherein the presser foot is made of a titanium alloy. (10) A rotor for a superconducting rotating electric machine according to any one of claims 1 to 9, wherein the presser foot is fixed to the coil mounting shaft via the first support member. (11) The superconducting rotating electric machine according to any one of claims 1 to 9, wherein the presser foot and the first support member are fixed together to the coil mounting shaft by a tightening member. rotor.