JPS6118343A - Rotor of superconductive rotary electric machine - Google Patents

Abstract

PURPOSE:To rigidly hold a superconductive field coil in a simple structure by forming a notch at the top of a tees of a coil mounting shaft, and chamfering the top of the tees integrated with the notch. CONSTITUTION:A superconductive field coil 3 is initially contained at its linear portion 31 and an arc portion 32 in a slot, and then contained at its corner 33 in the slot, thereby containing in the slot. In this case, since no corner is formed at the top 23 of a tees even if a notch 24 is small, the corner 33 of the coil 3 is not affected by the top 23 but readily associated within the slot without labor and time consumption by the chamfered part 27 formed at the top 23 integrated with the notch 24, and the coil can be rigidly held.

Description

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

[Conventional technology]

Conventionally, there has been a rotor shown in FIG. 1 as a general rotor of this type. In Figure 1, (c) 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), 15) is a low-temperature damper disposed between the room-temperature damper (4) and the coil mounting shaft (2), and (6) and (7) are the coil mounting shaft (
The helium outer cylinder and helium end plate are attached to the outer periphery and side surface of 2), respectively, (8) and (9) are the drive side and non-drive side end shafts, 00) are these end shafts (
8).

01) is a slip ring for supplying field current, UR is a heat exchanger formed or placed on torque tube (1), +131 is a side radiation shield, (rarely This is the vacuum section.

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 zero and excitation loss is eliminated. (3) 1ζ Generates a strong magnetic field and stator (
(not shown) to generate AC 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 an introduction pipe (not shown) into a helium outer cylinder (6), Helium end plate (7)
While supplying liquid helium to the container formed by
The interior of the rotor is brought to a high vacuum by the vacuum section 4), and
Cryogenic superconducting field coil (3) and coil mounting shaft (2)
) (The most common structure is that the torque tube (1) that transmits the ζ rotational torque is made of a thin-walled cylinder, and a heat exchanger +12 is provided to minimize the heat that enters the cryogenic part through this torque tube (1). . Furthermore, in order to reduce the heat that enters due to radiation from the side, the side shaft side shield +13
1 is provided.

On the other hand, the room temperature damper (4) and the low temperature damper I5) shield harmonic magnetic fields 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 15) also functions as a shaft-side 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 structure having a straight part 01) and an arc part (3z1) and a corner part (33) as shown in Figure 2. If it moves, the superconductor will break due to frictional heat, so it must be held firmly.

Furthermore, as can be seen from Fig. 1, the superconducting field coil 13) is triple-covered by a helium outer cylinder (6), a low-temperature damper (5), and a room-temperature damper T41, so it is difficult to inspect and repair it. is extremely 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 the superconducting field coil +31 of this dish is described in Japanese Patent Laid-Open No. 166889/1989. This holding method is as shown in Figure 8, where the straight part (31) of the superconducting field coil (3) is attached to the coil mounting axis (2).
It is held by a wedge inserted into the slot, which is housed in the straight part of the slot formed in the! ! 3 conductive field coils (
The arc part □ and corner part (33) of 3) are connected to the coil mounting shaft (
2), the retaining ring (16) and the insulating pawl u'? ) is maintained. In addition, the retaining ring (
16), an insulating cover @ is provided on the inner peripheral side.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, that is,
A circumferential cross-sectional view of the straight part (311) of the superconducting field coil (3) is shown. In Fig. 4, (21 is the coil mounting shaft, 13) is the superconducting field coil, u51 is the wedge, and t+81 is the coil mounting A slot formed in the axial direction on the surface of the shaft (2), 0 bag is insulation in the slot, and t20+ is wedge insulation.

In this configuration, the superconducting field coil 13) is A-A
It is wound around the wire, and therefore generates a strong magnetic field with the A-A wire as the pole center. The wedge (19) is driven to firmly hold the superconducting field coil (3) within the slot. Therefore, the coil holding reliability is high.

Furthermore, 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 Superconducting field coils, (6) and (7) are helium outer cylinders and helium end plates, (16+ is a retaining ring, 0η is an insulating pawl, 1) is an insulating bottom plate, and (1) is an insulating cover. In FIGS. 5 and 8, the area between the arc part and the corner part of the superconducting field coil 13) is housed in a stepped part formed on the coil mounting shaft +21, and an insulating material (1η) is placed in the gap between the arc part and the corner part. It is firmly driven in, and a retaining ring (1ω) is shrink-fitted on top of it.

However, the arc part Cl21 and the corner part ■ of the super N''J+ field coil (3), that is, the coil installation 1'Jl (
The amount of thermal contraction of the insulating pawl Uη, which occupies a large volume in the stepped part formed in 21, is about 2 degrees larger than that of the coil mounting shaft (2) and the superconducting field coil (3), and is Even if the insulating pads Uη are firmly driven in during the manufacturing stage, when the coil is cooled to an extremely low temperature, a gap will be created between the insulating pads Uη and the superconducting field coil (3). Insulating nails (Iη
Since the coil has a large volume, this gap is also large, and therefore, there is a risk that the superconducting field coil (3) may move due to vibrations or the like during operation, and the superconductor may be destroyed due to frictional heat.

As shown in Fig. 6, the proposed improvement is to house the entire straight part (311, arc part (32), corner part □□□) of the superconducting field coil (3) in the slot 18), 0
5), but it is not possible to incorporate the pre-wound superconducting field coil (3) into the slot (18) formed on the outer circumferential side of the coil mounting shaft (2). , it is necessary to form the superconducting field coil 13) by winding it directly into the slot (18) of the coil mounting shaft (2).

However, winding in the slot (181) is difficult to work with.
The disadvantage is that winding requires a lot of time and money.

Examples of this improvement plan include those shown in FIGS. 7 to 12. Fig. 7 is a perspective view showing the end of the coil attachment shaft, Fig. 8 is a sectional view taken along the line ■-■ in Fig. 7, that is, a sectional view of the corner portion, and Figs. 9 and 10 are plane views showing the presser foot. FIG. 11 is a sectional view taken along the line XI-XI in FIG. 7, and FIG. 12 is a perspective view showing the assembled state of the superconducting field coil. Coil mounting shaft, (3) is superconducting field coil, (31) is straight part, (support)
is the arc part, time is the corner part, (IS is the model, the decoy is the slot formed in the coil mounting shaft (2), and the straight part (18
It is composed of a), an arc portion (18b), and a corner portion (18C). +19) is insulation in the slot, +20)
C3) is a wedge insulation, C3) is the top of the teeth of the coil mounting shaft (2), @ is a notch formed in the top of the teeth t23) of the coil mounting shaft (2) adjacent to the corner part (1sc) of the slot f181, (to) is fixed to this notch part Q41 by pole l-+261, and the wedge (19) is pressed radially inward, and the corner part of the superconducting field coil (3) (
This is a presser foot that firmly holds the bolt 33j, and has a bolt hole (25a) through which the bolt 5+ is passed.

With the above configuration, the corner part of the superconducting field coil (3) is firmly held in the slot t18+ by the presser foot (b), and the arc part (
32) and the straight part 01) are connected to the slot (1) by the wedge 051.
8) It is held firmly inside. In addition, as shown in Fig. 12, the pre-wound superconducting field coil (3) is first housed in the slot (the straight part C31) and the arc part □□□, and then the corner part is installed in the slot midline by storing it in the slot G mark. Therefore, the work is easy and the superconducting field coil (3) can be firmly held. Furthermore, the straight line of the superconducting field coil (3) Part C
11l, between the arc parts, and the entire corner part (2) is structured to be held by the slot (wedge 05 that is stored during processing) and the presser foot (b), so the retaining ring (161) is not required and the structure is simple. Inspection and repair are easy, and the economic effect is high.Also, the pre-wound superconducting field coil (3) can be inserted into the slot t18+, and the superconducting wire can be inserted into one
Each turn has a slot that matches the shape of the slot (compared to the old inefficient winding process where the wire was wound directly into the slot, work efficiency has been improved).

However, in the structure of this improved proposal, when the superconducting field coil (3) is assembled into the slot (18), the corner part (33) of the superconducting field coil (3) is
1 and the corner part of slot 118+ (is c
) There was a problem with the storage work. In other words, as shown in FIG.
The innermost circumference of is the shortest. Therefore, the notch needs to be large enough to allow the innermost superconducting wire to pass over the tooth tops (23), but since the superconducting rotor rotates at high speed, the bolts ( ) is acted on by the centrifugal force of the superconducting field coil (3) and the presser foot, and this bolt (
26) The stress becomes large. To reduce this stress, make the presser foot scratches smaller. That is, it is desirable to make the cutout portion (goods) small. In this way, the size of the notch (241) is limited due to mechanical strength, and work must be done to prevent the corner part (33) of the superconducting field coil I31 from hitting the corner of the tooth top G connected to the notch 241. It took effort and time.

[Summary of the invention]

This invention was made in view of the above-mentioned drawbacks of the conventional products, and involves forming a notch at the top of the teeth of the coil mounting shaft adjacent to the corner of the slot, and attaching a presser foot to this notch. By fixing the wedge so as to press it radially inward with the tightening member and by forming a chamfered portion on the top of the teeth that connect to the notch, the superconducting field coil can be firmly held, and it is possible to securely hold the wedge by pre-winding. The present invention provides a rotor for a superconducting rotating electrical machine into which a superconducting field coil can be easily incorporated.

[One embodiment of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 14 and 15. Fig. 14 is a perspective view showing the assembled state of the superconducting field coil, and Fig. 15 is a perspective view showing a part of the top of the teeth. 3) is a superconducting field coil, 01) is a straight part, (32) is an arc part, (33) is a corner part, ■ is a slot formed in the coil mounting shaft +21, and the straight part (18a), the arc part (18b), corner part (1s
c). ) is the coil mounting shaft (2)
The top of the tooth (to) is a notch formed in the top of the tooth (23) of the coil mounting shaft (2) adjacent to the corner (18C) of the slot (181), and (A) is the notch formed in this notch 241. This is a chamfered portion formed on the tops (c) of the continuous teeth.

With the above configuration, the superconducting field coil (3)
The straight portion (31) and the arc portion are first accommodated in the slot 1g+, and then the corner portion (33) is accommodated in the slot phase, thereby being incorporated into the slot (]8).

At that time, due to the chamfered part (2) formed on the top part of the tooth (2) connected to the notch part (to), even if the notch part (to) is small, the tooth top part (23) has no corner, so the superconducting field coil ;3) The corner portion can be easily incorporated into the slot (1B) without being affected by the top of the teeth and without expending effort and time.

〔Effect of the invention〕

As explained above, this invention forms a notch at the top of the teeth of the coil mounting shaft adjacent to the corner of the slot, and presses the wedge radially inward against this notch using the clamping member of the presser foot. By forming a chamfered part on the top part of the tooth f that is fixed and connected to the notch part, the superconducting field coil can be firmly held with a simple structure, and the superconducting field coil, which has been pre-wound, can be moved without labor. It is possible to obtain a highly reliable rotor for a superconducting rotating electrical machine that can be easily assembled without spending much time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the overall concept of a rotor of a general superconducting rotating electric machine, Fig. 2 is a perspective view showing the state of the superconducting field coil in Fig. 1 after winding, and Fig. 8 is a conventional Perspective view showing the end of the coil attachment shaft of the rotor of the superconducting rotating electric machine, No. 4
The figure is a cross-sectional view taken along the line ■-IV in Figure 1, Figure 5 is a cross-sectional view showing the arc portion of a conventional superconducting field coil, and Figure 6 is a coil installation of the rotor of another conventional superconducting rotating electric machine. FIG. 7 is a perspective view showing the shaft end where the coils of the rotor of another conventional superconducting rotating electric machine are attached, and FIG. 8 is the same as FIG. 7.
9 and 10 are a plan view and a front view showing the presser foot in FIG. 7, and FIG. 11 is a sectional view taken along the line
12 is a perspective view showing the assembled state of a conventional superconducting field coil, FIG. 18 is a perspective view showing a part of the tooth top in FIG. 12, and FIG. FIG. 15 is a perspective view showing a state in which a superconducting field coil is installed in a rotor of a superconducting rotating electrical machine according to an embodiment, and FIG. 15 is a perspective view showing a part of the tooth top in FIG. 14. In the figure, (2j is the coil mounting axis, (3) is the superconducting field coil, Gll is the straight part, ■ is the arc part, (33) is the corner part, (151 is the wedge, [8+ is the slot, Qga)
is a straight part, (18b) is an arc part, (is c) is a corner part, (to) is a tooth top, (to) is a notch part,
(C) is the presser foot, ■ is the tightening member, and the upper part is the chamfered part. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A coil mounting shaft in which a slot having a straight line portion and an arc portion is formed on the shaft surface, a superconducting field coil housed in the slot of the coil mounting shaft, and a superconducting field coil inserted into the slot to hold the superconducting field coil. a wedge, a notch formed at the top of the tooth of the coil mounting shaft adjacent to the corner of the straight line part and the arc part of the slot; A rotating superconducting rotating electrical machine characterized by comprising: a presser foot that presses inward and holds the superconducting field coil at a corner portion of the slot; and a chamfered portion formed at the top of the teeth that connects to the notch portion. Child.