JP4732053B2 - Superconducting rotating electrical machine rotor - Google Patents

Description

  The present invention relates to a rotor of a superconducting rotating electrical machine, and more particularly to a rotor of a superconducting rotating electrical machine having an improved winding mounting shaft.

  As a superconducting rotating electrical machine, a generator using a superconducting wire for a field winding of a rotor is known (see Patent Documents 1 and 2). A field winding using a superconducting wire needs to be cooled to an extremely low temperature of 100K or less in order to maintain its superconductivity, and liquid helium or liquid nitrogen is used as a cooling medium.

  FIG. 2 is a longitudinal sectional view showing a rotor of a conventional superconducting rotating electrical machine. In FIG. 2, 1 is a room temperature damper shield that constitutes the outer cylinder of the rotor, which has a damper function that prevents external magnetic flux from entering the rotor and also functions as a vacuum vessel. The shafts 2a and 2b are connected. The rotary shafts 2a and 2b are rotatably supported by bearings 3a and 3b, respectively, one of which constitutes a driving side end shaft and the other of which constitutes a counter driving side end shaft. A refrigerant supply / discharge pipe 4 is provided in the rotary shaft 2b constituting the counter drive side end shaft, and a field current supply slip ring 5 is provided on the outer periphery. Inside the room temperature damper shield 1, a cylindrical winding attachment shaft 6 is provided coaxially with the room temperature damper shield 1. A space 7 for storing the refrigerant is formed in the central portion of the winding mounting shaft 6, and a refrigerant such as liquid helium is supplied to the space 7 through the refrigerant supply / discharge pipe 4. In addition, the vaporized gas is exhausted. Superconducting field windings 8 housed in a plurality of slots are provided on the outer peripheral portion of the winding mounting shaft 6 so as to be cooled to a cryogenic temperature by a refrigerant. A field current is supplied from the slip ring 5 to the superconducting field winding 8 via the electric wire 9.

  Torque tubes 10a and 10b that are connected to the winding mounting shaft 6 and transmit rotational torque to the outside are provided on both sides in the axial direction of the winding mounting shaft 6, respectively. The other end portion of one torque tube 10a is provided with a thermal expansion absorbing mechanism portion 11 for allowing thermal deformation of the winding mounting shaft 3, and is connected to the room temperature damper shield 1, while the other torque tube 10b The end is connected to the rotating shaft 2b. The insides of the room temperature damper shield 1 and the torque tubes 10a and 10b are maintained in vacuum for heat insulation.

In the superconducting rotor constructed as described above, the superconducting field winding 8 provided on the winding mounting shaft 6 is cooled to a very low temperature to bring the electric resistance to zero, thereby eliminating the excitation loss and providing a strong magnetic field. By rotating while generating, AC power is generated in a stator (not shown).
JP-A-11-27929 Japanese Patent Laid-Open No. 10-285905

  By the way, in the rotor of the conventional superconducting rotating electrical machine, since the superconducting field winding 8 is used at an extremely low temperature of 100K or less, the winding mounting shaft 6 is also cooled to an extremely low temperature. The winding 8 and the winding mounting shaft 6 contract in the axial length. On the other hand, since the room temperature damper shield 1 is in contact with the inside air of the rotating electrical machine at room temperature, the axial length is substantially constant regardless of the cooling state of the superconducting field winding 8. For this reason, when the superconducting field winding 8 is in an extremely low temperature state, a relative displacement is generated between the winding mounting shaft 6 and the room temperature damper shield 1. The thermal elongation absorption mechanism 11 of one torque tube 10a connected to the winding attachment shaft 6 is installed for the purpose of allowing this relative displacement. Therefore, it is necessary to configure the hot stretch absorption mechanism portion 11 in a flexible structure that can allow the above-described relative displacement, and it is necessary to configure it in a strong structure for transmitting torque, resulting in a complicated structure. was there. Moreover, the rotor of the conventional superconducting rotating electrical machine has a long axial length because the torque tubes 10a and 10b are connected to both sides of the superconducting field winding 8 of the winding take-up shaft 6 in the axial direction. There was a problem of becoming.

  The present invention has been made to solve the above-described problem, and it is not necessary to provide a thermal elongation absorption mechanism in the torque tube, and a superconducting rotating electrical machine that can reduce the axial length of the entire rotor. The purpose is to obtain a rotor.

  In order to solve the above problems, a rotor of a superconducting rotating electrical machine according to the present invention includes a cylindrical winding mounting shaft, a superconducting field winding provided on the outer periphery of the winding mounting shaft, and a winding mounting In a rotor of a superconducting rotating electrical machine comprising a torque tube connected to a shaft and two rotating shafts to which torque is transmitted through the torque tube, the winding mounting shaft is a superconducting field winding A protrusion having an axial length shorter than that of the superconducting field winding is formed on the inner side of the coil so as to protrude radially inward, and a torque tube is connected to the protrusion.

  According to the present invention, the superconducting field winding that is cooled to a cryogenic temperature is connected in the axial direction by connecting the torque tube to the protruding portion having a short axial length provided inside the superconducting field winding. Therefore, it is not necessary to provide a thermal elongation absorption mechanism part in the torque tube, and no torque tube is disposed on both sides in the axial direction of the superconducting field winding. The axial length of the entire rotor can be shortened.

  FIG. 1 is a longitudinal sectional view showing a rotor of a superconducting rotating electrical machine according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a room temperature damper shield that constitutes an outer cylinder of the rotor. This room temperature damper shield 1 is made of copper or a copper alloy, prevents external magnetic flux from entering the rotor, and is a vacuum vessel. It also has a damper function. Rotating shafts 2a and 2b are connected to both ends of the room temperature damper shield 1. The rotary shafts 2a and 2b are rotatably supported by bearings 3a and 3b, respectively, one of which constitutes a driving side end shaft and the other of which constitutes a counter driving side end shaft. The rotating shaft 2b constituting the counter-driving side end shaft is provided with a refrigerant supply / discharge pipe 14 and a field current supply slip ring 5 on the outer periphery thereof.

  Inside the room temperature damper shield 1, a cylindrical winding attachment shaft 16 is provided coaxially with the room temperature damper shield 1. The winding mounting shaft 16 is formed in a cylindrical shape from stainless steel or the like, and the superconducting field winding 8 is housed in a plurality of slots formed in the outer peripheral portion and fixed by an epoxy resin or the like. Further, on the inner side of the axial central portion of the winding mounting shaft 16, a protruding portion 16 a having an axial length shorter than that of the superconducting field winding 8 protrudes radially inward continuously in the circumferential direction. Is formed. The winding mounting shaft 16 and the superconducting field winding 8 are cooled to a cryogenic temperature by a refrigerant such as gaseous helium or liquefied helium that is forcibly supplied and discharged through the pipe 14 introduced into the protruding portion 16a. It has become. The superconducting field winding 8 is supplied with a field current from the slip ring 5 via the electric wire 9.

  Thin cylindrical torque tubes 20a and 20b for transmitting rotational torque to the outside are provided on both axial sides of the protrusion 16a of the winding attachment shaft 16. The torque tubes 20 a and 20 b are respectively arranged and connected between the rotary shafts 2 a and 2 b located on both sides in the axial direction of the winding attachment shaft 16 and the protrusions 16 a of the winding attachment shaft 16. The insides of the normal temperature damper shield 1 and the torque tubes 20a and 20b are maintained in vacuum for heat insulation.

  In the rotor of the superconducting rotating electrical machine configured as described above, the torque tubes 20a and 20b are disposed inside the superconducting field winding 8 having a long axial length, and the projecting portion 16a having a short axial length is provided. The superconducting field winding 8 that is cooled to an extremely low temperature is maintained in a state in which thermal deformation along the axial direction is free by being disposed between the two. For this reason, the torque tubes 20a and 20b are not affected by the relative displacement between the superconducting field winding 8 and the room temperature damper shield 1, and absorb the thermal elongation as provided in the rotor of a conventional superconducting rotating electrical machine. There is no need to provide a mechanism. In addition, the superconducting field winding 8 and the torque tubes 20a and 20b of the winding mounting shaft 16 are disposed so as to overlap in the radial direction, and no torque tube is disposed on both sides in the axial direction of the superconducting field winding 8. It is possible to reduce the axial length of the entire rotor.

1 is a longitudinal sectional view showing a rotor of a superconducting rotating electrical machine according to an embodiment of the present invention. It is a longitudinal cross-sectional view which shows the rotor of the conventional superconducting rotary electric machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Room temperature damper shield 2a, 2b ... Rotary shaft 3a, 3b ... Bearing 4, 14 ... Pipe 5 ... Slip ring 6, 16 ... Winding attachment shaft 7 ... Space part 8 ... Superconducting field winding 9 ... Electric wire 10a, 10b , 20a, 20b ... torque tube 11 ... thermal elongation absorption mechanism 16a ... projection

Claims (2)

  A cylindrical winding mounting shaft, a superconducting field winding provided on the outer periphery of the winding mounting shaft, a torque tube connected to the winding mounting shaft, and torque are mutually transmitted via the torque tube. In the rotor of a superconducting electric rotating machine comprising two rotating shafts to be transmitted, the winding mounting shaft is shorter in the axial direction than the superconducting field winding inside the superconducting field winding. A rotor of a superconducting rotating electrical machine, wherein a protrusion is formed to protrude radially inward, and the torque tube is connected to the protrusion.   2. The torque tube according to claim 1, wherein there are two torque tubes, and each of the torque tubes is connected between a rotating shaft located on both axial sides of the winding mounting shaft and a protruding portion of the winding mounting shaft. The rotor of the described superconducting rotating electrical machine.

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