JP2749209B2 - Superconducting rotating electric machine rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

 [Object of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a winding of a rotor of a superconducting rotating electric machine.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional rotor of this type. In the figure, 1 is a superconducting field coil, and 2 is a coil mounting shaft for accommodating the superconducting field coil 1 and has a central hole 3 for storing liquid helium therein. 4 is a torque tube formed at both ends of the coil mounting shaft 2, 5 is a helium outer cylinder mounted on the outer peripheral portion of the coil mounting shaft 2, 6 is a rotor outer cylinder having a damper function, and is vacuum. A normal-temperature rotor also serving as a container, 7 is a low-temperature damper disposed between the helium outer cylinder 5 and the normal-temperature rotor 6, and 8 is a coil mounting shaft 2.
Is a flexible support that flexibly supports the rotor 6 at room temperature, 9 and 10 are rotating shafts, 11 is a bearing that supports the rotating shafts 9 and 10, and 12 is a holding ring fitted to both ends of the coil mounting shaft 2. is there.

The superconducting field coil 1 housed in the coil mounting shaft 2 is cooled to an extremely low temperature, so that the electromagnetic resistance becomes zero and the excitation loss is eliminated. The rotor of the superconducting rotary electric machine having the above-described configuration generates a strong magnetic field in the superconducting field coil 1 and causes a stator (not shown).
To generate AC power.

[0004] A large centrifugal force acts on the superconducting field coil 1 by rotation, and a strong electromagnetic force acts upon excitation. If the superconducting field coil 1 is not firmly fixed to the coil mounting shaft 2, the superconducting field coil 1
Is moved by electromagnetic force, and the frictional heat causes the temperature of the superconducting field coil 1 to rise, causing superconducting breakdown.

Since the superconducting breakdown of the superconducting field coil 1 necessitates stopping the operation of the rotating electric machine, the superconducting field coil 1 is fixed to the superconducting field coil mounting shaft 2, that is, the superconducting field coil 1 is assembled.
How to apply a compressive load to steel is an important technical issue.

In general, a compressive load-displacement diagram of a superconducting field coil shows a decrease in stiffness in a low-load region showing nonlinearity as a whole, as shown in FIG. Therefore, when the fixing force, that is, the compressive load at the time of assembly is small, the compressive rigidity of the superconducting field coil is low, so that the amount of deformation and movement by the electromagnetic force increases, and the heat generation by friction increases. Conversely, if a sufficient compressive load is applied at the time of assembly, the rigidity of the superconducting field coil is high, and the amount of deformation and movement by the electromagnetic force is small, so that heat generation due to friction can be reduced.

As a conventional method of fixing a superconducting field coil using a retaining ring, there is a longitudinal sectional view of an end of a coil mounting shaft shown in FIG. 13 is a slot provided in the circumferential direction of the surface of the coil mounting shaft 2, 14 is an upper hook, 15 is a lower hook, 16 is a side hook, 17 is a radial through hole provided on the coil mounting shaft, and is a coolant flow path. Make
The end of the coil mounting shaft is covered with a cylindrical insulator 18, and the holding ring 12 is shrink-fitted to the outer periphery thereof, and the coil is fixed by tightening.

[0008]

In the conventional method of shrink-fitting the retaining ring, the amount of compression is limited by the heating temperature of the retaining ring, the allowable temperature of the inner cylinder, the clearance required for assembly, and the like.
In some cases, the compressive load applied to the coil was insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an electromagnetic force can be accurately and reliably applied to a predetermined size with a compressive load required for fixing a superconducting field coil. It is an object of the present invention to provide a highly reliable rotor for a superconducting rotating electric machine by suppressing the movement of a superconducting field coil due to the above and preventing the occurrence of superconducting destruction caused by a temperature rise due to friction. [Configuration of the Invention]

[0010]

In order to achieve the above object, a rotor of a superconducting rotary electric machine according to the present invention has a tapered portion on the inner periphery of a holding ring and a space between the holding ring and the superconducting field coil. A superconducting field coil in the direction of the inner diameter of the coil mounting shaft, with a structure having a cylindrical shape having a divided portion in the circumferential direction and having a taper in the axial direction at a position facing the tapered portion of the holding ring on the outer peripheral surface. The purpose is to obtain the fixing force of the tightening superconducting field coil.

[0011]

In the rotor of the superconducting rotary electric machine according to the present invention, a large fitting allowance can be obtained by selecting the taper angle of the retaining ring, so that a stronger fixing force than the conventional one can be obtained.
Since the compressive force can be managed quantitatively, the superconducting field coil is securely fixed. Further, the insulator is easily disassembled, and the insulator is not damaged by heat.

[0012]

An embodiment of the present invention will be described below. FIG. 1 is a longitudinal sectional view of a slot of a coil mounting shaft end of a rotor of a superconducting rotary electric machine embodying the present invention, and the same parts as those of the above-described conventional structure are denoted by the same reference numerals and description thereof is omitted. . Reference numeral 19 denotes an insulator covering the stepped portion at the end of the coil mounting shaft, which has an axial cutout as shown in FIG.
It has a taper on the outer peripheral side. The shape of the insulator 19 may be divided into two or more as shown in FIG. Reference numeral 20 denotes a tapered holding ring fitted to the end of the coil mounting shaft 2, which has a tapered surface in contact with the insulator 19, and presses the insulator 19 in the inner diameter direction when fitting while pressing in the axial direction. Has a function of uniformly applying a predetermined compressive force to the superconducting field coil 1.

According to the configuration of the present embodiment, by adjusting the inner diameter of the tapered holding ring 20 and the thickness of the tapered insulator 19 in advance, a predetermined compressive force can be easily uniformly applied to the end of the superconducting field coil. Is obtained.

In this embodiment, the compressive force is directly applied in the slot depth direction. However, the compressive force in the width direction is conventionally reduced by the amount of collapse of the conductor due to the compressive force in the slot depth direction. The fixing of the superconducting field coil is improved in both directions.

FIG. 3 shows another embodiment of the present invention, in which a tapered insulator 19 is provided outside a cylindrical insulator 18.
A metal 21 having the same shape as that described above is fitted, and a tapered holding ring 20 is fitted on the outside thereof.

Although the two embodiments have been described above, the holding ring support structure may be only the end portion or the entire length. Further, the same effect as described above can be obtained even if the tapered insulator and the insulator covering the outer periphery of the coil are integrated.

[0017]

As described above, according to the present invention, the coil is tightened in the inner diameter direction by pushing the tapered holding ring in the axial direction and fitting it, and the fixing pressure of the superconducting field coil in the slot width direction and the depth direction. The structure provides a stronger fixing force than before, and the fixed pressure can be quantitatively managed, so that the superconducting field coil is securely fixed and prevents the superconducting field coil from moving due to electromagnetic force. It is possible to provide a highly reliable rotor for a superconducting rotating electric machine by preventing superconducting destruction based on frictional heat.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a coil mounting shaft end of a rotor of a superconducting rotating electric machine according to one embodiment of the present invention.

2A and 2B are perspective views of a tapered insulator, wherein FIG. 2A is an insulator used in the embodiment of FIG. 1, and FIG.

FIG. 3 is a longitudinal sectional view of a coil mounting shaft end of a rotor of a superconducting rotating electric machine according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the general concept of a rotor of a conventional general superconducting rotary electric machine.

FIG. 5 is a general compressive load-strain characteristic diagram of a superconducting field coil.

FIG. 6 is a longitudinal sectional view of a coil mounting shaft end of a rotor of a conventional general superconducting rotating electric machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Superconducting field coil 2 ... Coil mounting shaft 3 ... Center hole 4 ... Torque tube 5 ... Helium outer cylinder 6 ... Room temperature rotor 7 ... Low temperature damper 8 ... Flexible support 9, 10 ... Rotating shaft 11 ... Bearing 12 ... Holding ring 13 ... Slot 14 ... Upper claw 15 ... Lower claw 16 ... Side claw 17 ... Cooling channel 18 ... Cylinder insulator 19 ... Tapered insulator 20 ... Tapered holding ring

Claims (1)

(57) [Claims] 1. A coil mounting shaft having a slot formed in the shaft surface and having a center hole for storing a coolant in the center of the shaft, a superconducting field coil housed in the slot of the coil mounting shaft, and the superconducting field coil. In a rotor of a superconducting rotating electric machine that holds a superconducting field coil by a holding ring fitted on the coil mounting shaft after covering the outer periphery with an insulator, an inner surface of the holding ring is provided with an axial taper, A structure is provided between the ring and the superconducting field coil, which is a cylindrical portion having a divided portion in the circumferential direction and a structure having an axial taper on a circumferential outer surface at a position facing the taper of the holding ring. Rotor of a superconducting rotating electric machine.