JPS6118344A - Rotor of superconductive rotary electric machine - Google Patents

Abstract

PURPOSE:To rigidly hold a superconductive field coil by forming a notch at the top of a tees of a coil mounting shaft, and using a retainer for the notch. CONSTITUTION:A superconductive field coil 3 is held at its corner 33 by a retainer 25 rigidly in a slot 18 and rigidly held at an arc portion 32 and a linear portion 31 in the slot 18 by a wedge 15. The coil 3 is initially contained at the linear portion 31 and the arc portion 32 in the slot 18, and then contained at the corner 33 is the slot 18, thereby associating in the slot 18. Thus, they can be readily associated in the slot 18 without influence of the top 23 of the tees of a coil mounting shaft 2 adjacent to the corner 18c of the slot 18.

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 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), I3) 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 surrounding it, (5) is a low-temperature damper disposed between this room-temperature damper (4) and the coil mounting shaft (2), and (6) and (7) are the coil mounting shaft (
2), the helium outer cylinder and helium end plate attached to the outer periphery and 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) A slip ring for supplying the field current, 02 is a heat exchanger formed or placed in the torque tube (1), 113 is a side radiation shield, and the circle is a vacuum part. It is.

Iteha is applied to the rotor of the superconducting rotating electrical machine with 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. ) can emit a strong magnetic field. 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) to the helium outer periphery (6) and the helium end plate. (7
) is supplied to the liquid helium container section formed by
Cryogenic superconducting field coil (3) and coil mounting shaft (2)
The most common structure is to use a thin-walled cylindrical torque tube (1) that transmits rotational torque to the (1), and to provide a heat exchanger i+2 to reduce as much as possible the heat that enters the cryogenic part through this torque tube (1). Furthermore, a side shaft-side shield 113 is provided to reduce heat entering from the side toward the shaft.

On the other hand, the normal temperature damper (4) and the low temperature damper 15) 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.
4) generally functions as a vacuum outer cylinder, and the low-temperature damper (5) also functions as a shaft-side shield for the helium container. In FIG. 1, the piping constituting the helium introduction and discharge system inside the rotor and the helium introduction and discharge device connected to the rotor are omitted.

The superconducting field coil (3) has a straight section + as shown in Figure 2.
31+, arc part (3211 corner part). If this superconducting field coil (3) moves during operation, the superconductivity will be destroyed by frictional heat, so it must be held firmly.

Also, as can be seen from Figure 1, ~Superelectric Sakai Field i Magnetic Coil (3)
Is helium circumference (6), low temperature Dan 6'? +51, Since it is triple covered by the room temperature damper (4), inspection and repair are extremely difficult. In particular, rotating electric machines require high reliability, so superconducting field coils (3
) is the key to the success or failure of superconducting rotating electric machines.

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 Figure 3, where the straight part of the superconducting field coil (3) (311 is the coil mounting shaft (2)
The superconducting field coil (
3) between the arc parts and the corner part (2) are connected to the coil mounting shaft (2).
), and is held by a retaining ring (161) and an insulating pawl Uη.An insulating cover is provided on the inner circumferential side of the retaining ring (■ω).

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 (31) of the super-1-conducting field coil (3) is shown. In Fig. 4, (2) is the coil mounting axis, (3) is the superconducting field coil, and u9 is the superconducting field coil. wedge, (1 second is the slot formed in the axial direction on the surface of the coil mounting shaft (2), (1!I) is the insulation in the slot, and the second is the wedge insulation. In this configuration, the superconducting field coil +31 is , are wound around the A-A wire, thus generating a strong magnetic field with the A-A wire as the pole center.The wedge 051 firmly holds the superconducting field coil (3) in the slot machine. Therefore, the coil retention is highly reliable.

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 Superconducting field coil, (6) and (7) are helium outer cylinder and helium end plate, (16) is retaining ring, 171 is insulating pawl, 121
1 is an insulating bottom plate, and (support) is an insulating cover. In Figures 3 and 5, the arc part (between the edge and the corner part) of the superconducting field coil (3) is housed in a stepped part formed on the coil mounting shaft (2), and an insulating pad u is placed in the gap. '7) is solid f
This is driven in, and a retaining ring Oω is further shrink-fitted thereon.

However, the arc part (3) of the superconducting field coil (3)
3) and the corner city, that is, the insulating pawl u that occupies a large volume in the stepped part formed on the coil mounting shaft (2).
The amount of heat shrinkage of '7) is about 2 degrees larger than that of the coil mounting shaft (2) and the superconducting field coil (3), and the insulating material t17) is firmly driven in during the manufacturing stage at room temperature. However, when it is cooled to an extremely low temperature, a gap is created between the insulating material dη and the superconducting field coil +31. Since the insulating material u7) has a large volume, this gap will also be large,
Therefore, due to vibrations and other causes during operation, the superconducting field coil (
3) may move and cause superconductor destruction due to frictional heat.

As a proposed improvement, as shown in FIG. 6, the straight part f311 of the superconducting field coil (3). There is a method of storing the entire arc part country, corner part mark) in the slot [81 and holding it with a wedge o9, but the coil installation lll1i! The superconducting field coil (3), which has been pre-wound, cannot be inserted into the slot formed on the outer circumferential side of the coil mounting shaft (2). ) slot u
8) It is necessary to wind the wire directly into it and mold it. but,
Winding the wire in the slot AS+ has the disadvantage that the workability is poor and the winding requires a great deal of time and cost.

[Summary of the invention]

This invention was made in view of the above-mentioned drawbacks of the conventional ones, and the slot formed in the coil mounting shaft is composed of a straight part, an arc part, and a corner part, and the slot adjacent to the corner part of the slot is A notch is formed at the top of the teeth of the coil mounting shaft, and the presser foot is fixed to this notch using a tightening member so as to press the wedge radially inward, thereby firmly holding the superconducting field coil. The present invention provides a rotor for a superconducting rotating electric machine that can be used to create a superconducting rotating electric machine, and in which a pre-winding superconducting field coil can be incorporated.

[One embodiment of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 7 to 12. FIG. 7 is a perspective view showing the end of the coil mounting shaft;
FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, that is, a sectional view of the corner part, FIGS. A cross-sectional view along the XT line and FIG. 12 are perspective views showing the assembled state of the superconducting field coil. In FIGS. 7 to 12, (2) is the coil mounting shaft, and (3) is the superconducting field coil. Coil, (31) is straight part, country is straight part, time is corner part, 051 is wedge, G8
) is a slot formed in the coil mounting shaft (2),
Straight section (18a), arc section (18b), corner section (1
8c). IB is the insulation in the slot, the bite is the wedge insulation, the company is the top of the teeth of the coil mounting shaft (2), (to) is the slot R): ] -t part (18
The coil mounting shaft 121 (7) adjacent to the coil mounting shaft 121 (7) is fixed to this notch (c) with a bolt tray 0, and the wedge (15
1 inward in the radial direction, and then turn the superconducting field coil (
3) is a presser foot that firmly holds the corner portion j, and has a bolt hole (25a) through which a bolt (26j) is passed.

With the above configuration, the corner part of the superconducting field coil (3) is firmly held in the slot U phase by the biasing of the presser foot, and the arc part (goods) and straight part ( 31) slot (18) by wedge (151)
held firmly inside. In addition, as shown in Fig. 12, the superconducting field coil (3) first stores the straight part C11l and the arc part (18+) in the slot (18+), then the corner part (33J) in the slot u. By storing it in the slot t18+, it is incorporated into the slot u81 without being affected by the tooth top (23) of the coil mounting shaft (2) adjacent to the corner part (1sc) of the slot tap.
can be easily incorporated into the Therefore, the work is easy and the superconducting field coil (3) can be firmly held. Furthermore, since the entire straight part CI), arc part holder, corner part mark) of the superconducting field coil (3) is housed in the slot 18) and held by the holder ++S and the presser foot ■, the retaining ring ( 16) is no longer required, the structure is simple, and inspection/
Not only is repair easier, but it is also more economical.

By the way, the centrifugal force within the superconducting field coil (3) and presser foot acts on the bolt 26). Since the rotor of the superconducting rotating electric machine rotates at high speed, the stress on the bolt W+ becomes large. In order to reduce this stress, it is preferable to make the presser foot (full width) of titanium or titanium alloy with relatively low specific gravity. By making such a presser foot □ made of titanium, the stress acting on the bolt (211i) can be reduced. can be reduced.

〔Effect of the invention〕

As explained above, this invention consists of a slot formed on a coil mounting shaft consisting of a straight part, an arc part, and a corner part, and a notch part is formed at the top of the teeth of the coil shaft adjacent to the corner part of the slot. Since the presser foot is fixed to the notch part using a tightening member so as to press the wedge radially inward, the superconducting field coil can be firmly held with a simple structure without using a retaining ring. Moreover, it is possible to obtain a highly reliable rotor for a superconducting rotating electric machine in which a pre-winding superconducting field coil can be easily incorporated.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the overall concept of a rotor of a general superconducting rotating electric machine, Figure 2 is a perspective view showing the state of the superconducting field coil in Figure 1 after winding, and Figure 3 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 line IV-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 mounting shaft of the rotor of another conventional superconducting rotating electric machine. FIG. 7 is a perspective view showing the end of the coil attachment shaft of the rotor of a superconducting rotating electric machine according to an embodiment of the present invention; FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7; 9 and 10 are a plan view and a front view showing a presser foot according to the present invention, and FIG. 11 is a sectional view taken along the line XI-X in FIG.
FIG. 12 is a perspective view showing the assembled state of the superconducting field coil according to the present invention. In the figure, (2) is the coil mounting shaft, 13) is the superconducting field coil, +31) is the straight part, country is the arc part, sea bream) is the corner part, mouth 5) is the wedge, (18) is the slot, (1s a
) is a straight part, (18b) is an arc part, (18C) is a corner part, (2) is a tooth top, (2 small is a notch part, inside is a presser foot, and (2) is a tightening member. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (3)

[Claims] (1) 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 this coil mounting shaft, and the superconducting field coil inserted in the slot. a notch formed at the top of the tooth of the coil mounting shaft adjacent to the corner of the straight part of the slot and the arc part;
A rotating superconducting rotating electrical machine characterized by comprising: a presser foot fixed to the notch portion by a tightening member and pressing the wedge radially inward to hold the superconducting field coil at the corner portion of the slot. Child. (2) A rotor for a superconducting rotating electric machine according to claim 1, wherein the presser foot is made of titanium. (3) A rotor for a superconducting rotating electric machine according to claim 1, wherein the presser foot is made of a titanium alloy.