JP2525066B2 - Superconducting rotating electric machine - Google Patents

Description

The present invention relates to a superconducting rotating electric machine.

[Conventional technology]

Traditionally, superconducting rotating electrical machines have been assigned to
-85-25) 50MVA superconducting rotor (hereinafter referred to as rotor) helium cooling characteristics and Hitachi review val66.No.2 (1984-
As described in the literature of 2) 50MVA superconducting synchronous generator, there is no example of installing a measuring device for a vacuum leak during rotation or a leak of helium in a superconducting rotating electric machine.

However, when a superconducting generator is put to practical use in the future and is operated with reliability for a long period of time, abnormal evaporation of liquid helium, quenching of the superconducting field winding (hereinafter referred to as field winding), etc. It is important to monitor the adiabatic vacuum layer leading to.

As a conventional measuring device, an abnormality detecting element such as a thermometer or a vacuum gauge is installed in the rotor, and a signal of the abnormality detecting element is taken out to the stator side via a slip ring or the like. When the rotation of the rotor is stopped, that is, when the rotor is stopped, a vacuum gauge is attached to the rotor vacuum container to measure the degree of vacuum.

[Problems to be Solved by the Invention]

In the above-mentioned conventional technique, the rotor is stopped to measure the degree of vacuum cannot be measured during operation, and continuous monitoring cannot be performed.
Further, in the case where the abnormality detecting element is attached, only the portion where the element is present is measured. Furthermore, by attaching an abnormality detecting element to the rotor, this element must be able to withstand high centrifugal force due to rotation, and the signal from this abnormality detecting element must be taken out through a slip ring or the like. However, the measurement system becomes complicated. Therefore, there is a problem that noise or the like causes a malfunction.

The present invention has been made in view of the above points, it is possible to detect the abnormality of the rotor on the stator side in a non-contact state during operation, and can be detected quickly regardless of the position of the abnormal portion,
It is an object of the present invention to provide a superconducting rotating electric machine capable of immediately shielding the magnetism of a rotor by magnetizing a room temperature damper.

[Means for solving the problem]

That is, according to the present invention, at least a part of the room temperature damper provided in the rotor is changed from non-magnetic to magnetic by a temperature decrease due to heat conduction during vacuum leakage in the adiabatic vacuum tank or leakage of cooling helium. It is formed of a material whose Curie point is adjusted, and the stator is provided with a magnetic field detection device for detecting the disturbance of the magnetic field from the field winding that occurs when the damper changes from non-magnetic to magnetic. It is designed to achieve the purpose.

[Action]

Since the above-mentioned means is provided, the room temperature damper changes from non-magnetic to magnetic when the operating temperature is lowered, and the magnetic field due to the field winding is disturbed, but the magnetic field disturbance is provided in the stator. It will be detected by the magnetic field detection device.

In this way, the rotor abnormality during operation can be detected in a non-contact manner, but if all or most of the room temperature damper is made of a material with the Curie point adjusted as described above, then all parts of the rotor can be detected. Anomalies about can be detected quickly. Also, if all parts of the room temperature damper are made of the material with the Curie point adjusted as described above, the room temperature damper will have magnetism when an abnormality occurs, shielding the high magnetic field of the stator and rotor. , The stator can be independent of the rotor, and the situation can be the same as when the system is automatically shut down.

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments.
FIG. 1 shows an embodiment of the present invention. As shown in the figure, the superconducting rotating electric machine is provided with a rotor 1, a stator 4 having an air gap armature winding 2 and a stator core 3, the rotor 1 being excited by an exciting power source and liquid helium. 5, a field winding 6 that is cooled, a liquid helium container (not shown) outside the field winding 6, a radiation shield 8 provided via a first adiabatic vacuum layer 7, and this radiation. It has a room temperature damper 9 provided outside the shield 8 via a second adiabatic vacuum layer 7a. In the superconducting rotary electric machine configured as described above, in this embodiment, the room-temperature damper 9 is formed of a material whose Curie point is adjusted so that the room-temperature damper 9 changes from non-magnetic to magnetic when the operating temperature of the room-temperature damper 9 decreases, and is fixed. The child 4 is provided with the magnetic field detection device 10. By doing so, the room temperature damper 9 changes from non-magnetic to magnetic when the operating temperature is lowered, and the magnetic field of the field winding 6 is disturbed. It becomes possible to detect the abnormality of the rotor 1 in the non-contact state on the stator side during operation by the magnetic field detection device 10 provided, and further, it is possible to detect it quickly regardless of the position of the abnormal portion,
By magnetizing the room temperature damper 9, it is possible to obtain a superconducting rotating electric machine that can immediately shield the magnetism of the rotor 1.

That is, the magnetic field detection device 10 is installed in the air gap armature winding 2 on the stator side. The room temperature damper 9 uses a material whose Curie point is adjusted so that the room temperature damper 9 changes from non-magnetic to magnetic when the operating temperature of the room temperature damper 9 decreases. The field winding 6 is placed inside the torque tube 11 and the liquid helium container, and the liquid helium 5 is enclosed inside the torque tube 11 and the liquid helium container.

In a normal state, the torque tube 11 or the radiation shield 8 and the room temperature damper 9 are separated by the first and second adiabatic vacuum layers 7 and 7a, and the thermal conduction and the like are performed by the room temperature damper 9 and the torque tube 11. Between the radiation shield 8 and the radiation shield 8 is hardly performed.

In such a state, when the vacuum degree is lowered in the first and second adiabatic vacuum layers 7 and 7a due to some cause, that is, a vacuum leak occurs or a helium leak occurs, the room temperature damper 9 is used. Temperature decreases due to heat conduction of the lower radiation shield 8, torque tube 11, helium, etc., and the room temperature damper 9 changes from non-magnetic to magnetic, and the room temperature damper 9 shields the magnetic field from the field winding 6. , The magnetic field distribution will be disturbed with respect to the stator side. The magnetic field detection device 10 incorporated so as to detect this turbulence makes it possible to detect an abnormal state of the rotor 1 without contacting the rotor 1. Further, by setting the magnetic field detecting device 10 so that the magnetic field detecting device 10 can detect the position where the disturbance of the magnetic field distribution starts to occur, the position where the abnormality of the rotor 1 has occurred can be specified within a certain range. . In FIG. 1, 12 is a helium transfer tube, 13 is an expected helium leak part, and 14 is an expected air leak part.

This detection situation will be described below. FIG. 2 shows the distribution of the magnetic field in the normal state. As shown in (a) of the figure, there is no disturbance of the magnetic field lines 15 due to the field winding, and therefore the detection waveform detected by the magnetic field detection device 10a is normal as shown in (b) of the figure. , No abnormality is found. When a helium leak or a vacuum leak occurs in the state of FIG. 2, it becomes as shown in FIG. 3 as an example. That is, as shown in FIG. 7A, the shaded portion of the room-temperature damper 9, that is, the portion having magnetism, disturbs the magnetic field lines 15 due to the field winding, and changes the magnetic field distribution. Therefore, the detected waveform measured by the magnetic field detection device 10a also has distortion as shown in FIG. In this case, a part of the room temperature damper 9 is magnetized. However, when the room temperature damper 9 is entirely magnetized, the magnetic field of the entire room temperature damper 9 affects the stator side. The magnetic lines of force 15 due to the magnetic winding disappear.
That is, due to the magnetic shield effect of the room temperature damper 9 on the air gap armature winding, the rotor can be magnetically independent from the stator side, and the system is cut off from the system. The magnetic field detection device 10a can also be used as the air gap armature winding.

As described above, according to the present embodiment, since the rotor vacuum leak and the helium leak abnormality can be detected without contacting the rotor during the operation of the superconducting rotating electric machine, the rotating object, for example, the slip ring It is possible to continuously monitor for abnormalities without installing such equipment.

The entire rotor can be surrounded by a material whose Curie point is adjusted so that it changes from non-magnetic to magnetic when the operating temperature decreases. Detectable and excellent in reliability.

Further, the magnetic field between the rotor and the stator is shielded at the time of abnormality, so that the superconducting generator and the system are substantially cut off, and the influence of the abnormal state of the rotor on the system side can be minimized. .

Another embodiment of the present invention is shown in FIGS. 4, 5 and 6. For these room temperature dampers, room temperature dampers 9a, 9b and 9c made of a non-magnetic material which can be usually considered are used. And these materials have the same length as the axial length of the room temperature dampers 9a, 9b, 9c, and the Curie point is adjusted so that it changes from non-magnetic to magnetic due to the decrease of the operating temperature.
16a, 16b and 16c are arranged respectively. That is, FIG. 4 shows the material 16a with the Curie point adjusted in the axial direction inside the room temperature damper 9a, and FIG. 5 shows the material 16b with the Curie point adjusted in the axial direction inside the room temperature damper 9b. FIG. 6 shows the material 16c having a Curie point adjusted in the axial direction outside the room temperature damper 9c. By doing so, it is possible to obtain the same effects as the above case.

FIG. 7 shows another embodiment of the present invention. In this embodiment, the material 16b whose Curie point is adjusted so as to change from non-magnetic to magnetic due to a decrease in operating temperature is formed to be smaller than the axial length of the room temperature damper 9d made of a non-magnetic material unlike the above-mentioned case. . The material 16d having the Curie point of such a length adjusted is installed inside the room temperature damper 9d and at substantially the center in the axial direction, and the material 16d is placed on the stator facing the material.
The magnetic field detection device 10b was installed so as to face 16d. By doing this, the shield effect of the rotor 1 hardly occurs as compared with the above-mentioned case, but the amount of the material 16d whose Curie point is adjusted is small, and the magnetic field detector 10b to be installed is also small. .

In this embodiment, the material 16d whose Curie point has been adjusted is installed inside the non-magnetic room temperature damper 9d and in the substantially center part in the axial direction, but the present invention is not limited to this, and inside and outside the room temperature damper 9d. It may be any of the above, and may be the end side in the axial direction.

FIG. 8 shows still another embodiment of the present invention.
In this embodiment, a material 16e having a length smaller than the axial length of the non-magnetic room temperature damper 9e as in the case described above and having a Curie point adjusted so as to change from non-magnetic to magnetic due to a decrease in the operating temperature is used. A plurality of them were placed inside the room temperature damper 9e. Then, place the material 16e on the stator facing the material 16e.
A magnetic field detection device 10c is provided so as to face each other. By doing so, it is possible to obtain a quick reaction when an abnormality occurs as compared with the case described above.

The arrangement of the material 16e having the adjusted Curie point is not limited to this, and may be inside or outside the room temperature damper 9e.

FIG. 9 shows another embodiment of the present invention. As described in the above embodiments, when the rotor abnormality is detected by incorporating it into the superconducting generator, the output signal is used as information.
Input to AVR (Automatic Voltage Regulator) 17. With this input, the output signal from the AVR17 to the thyristor type exciter 18 is used to control the output of the thyristor type exciter 18, and the flow of DC current to the field winding inside the rotor is controlled. Avoid excessive input of direct current to the field winding. This is necessary to protect the room temperature damper from becoming magnetized, the magnetic field of the field winding does not reach the stator side, and the voltage drops and the AVR17 is forced to raise the field current in order to maintain the voltage. Become.

As described above, according to the present embodiment, it is possible to quickly detect an abnormality, and therefore it is possible to perform quick control on related equipment such as the AVR and the turbine installed for the superconducting rotating electric machine based on the detected signal. The effect of instantly protecting can be achieved.

〔The invention's effect〕

As described above, according to the present invention, the rotor abnormality can be detected in a non-contact manner on the stator side during operation, and can be detected quickly regardless of the position of the abnormal portion. It becomes possible to immediately shield the rotor during operation, and it is possible to detect the rotor abnormalities on the stator side without contact.In addition, it can be detected quickly regardless of the position of the abnormal portion, and the room temperature damper is magnetized to rotate. It is possible to obtain a superconducting rotating electric machine that can immediately shield the child's magnetism.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an embodiment of the superconducting rotating electric machine of the present invention, and FIGS. 2 (a) and 2 (b) show the case where the magnetic field distribution is not disturbed. Explanatory diagram showing
(B) is a detection waveform diagram, FIG. 3 (a), (b) shows the case where the magnetic field distribution is disturbed, (a) is an explanatory diagram showing the passing state of the magnetic force lines, (b) is a detection waveform diagram , Figures 4 to 8
FIG. 9 is a longitudinal side view showing different embodiments of the superconducting rotary electric machine of the present invention, and FIG. 9 is a system diagram of a superconducting generator according to still another embodiment of the superconducting rotary electric machine of the present invention. 1 ... Superconducting rotor, 2 ... Air gap armature winding, 4 ... Stator, 5 ... Liquid helium, 6 ... Superconducting field winding, 7
...... First adiabatic vacuum layer, 7a ...... Second adiabatic vacuum layer, 8 ...
… Radiation shield, 9, 9a, 9b, 9c, 9d, 9e …… Room temperature damper, 10, 10a, 10b, 10c …… Magnetic field detector, 16a, 16b, 1
6c, 16d, 16e ... Material with adjusted Curie point

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinobu Mori 3-1, 1-1 Sachimachi, Hitachi, Ibaraki Hitachi Ltd. Hitachi factory (56) References JP-A-51-33597 (JP, A) JP 58-144569 (JP, A) JP 2-104888 (JP, A) JP 2-106184 (JP, A) JP 63-99759 (JP, A) JP 60-147656 (JP, A)

Claims (4)

(57) [Claims] 1. A superconducting field winding which is provided with a stator having a superconducting rotor and an air gap armature winding, wherein the superconducting rotor is excited by an exciting current and cooled by a cryogenic refrigerant, and the superconducting field winding. The field winding includes a radiation shield provided via a cryogenic refrigerant container and a first adiabatic vacuum tank, and a room temperature damper provided outside the radiation shield via a second adiabatic vacuum tank. In the superconducting rotary electric machine, at least a part of the room temperature damper has a Curie point so as to change from non-magnetic to magnetic by a temperature decrease due to heat conduction during vacuum leakage in adiabatic vacuum tank or leakage of cooling helium. A magnetic field detection device is formed of an adjusted material, and the stator is provided with a magnetic field detection device that detects a disturbance of a magnetic field from a field winding that occurs when the damper changes from non-magnetic to magnetic. Superconducting rotating electrical machine. 2. The superconducting rotating electric machine according to claim 1, wherein a plurality of the magnetic field detecting devices are provided inside the stator. 3. When the magnetic field detection device detects the disturbance of the magnetic field from the field winding, the excitation power supply for exciting the field winding is interlocked. 1. The superconducting rotating electric machine according to 1. 4. The superconducting rotating electric machine according to claim 1, wherein when the magnetic field detecting device detects a disturbance of a magnetic field from the field winding, it is determined that a vacuum leak has occurred in the rotor.