WO2007072536A1

WO2007072536A1 - Rotor for permanent magnet generator for gas turbine, method of producing the rotor, gas turbine, and method of producing the gas turbine

Info

Publication number: WO2007072536A1
Application number: PCT/JP2005/023235
Authority: WO
Inventors: Hideaki Nagashima; Yasushi Hayasaka; Manabu Yagi
Original assignee: Hitachi, Ltd.
Priority date: 2005-12-19
Filing date: 2005-12-19
Publication date: 2007-06-28
Also published as: JP4681008B2; JPWO2007072536A1

Abstract

Disclosed are a rotor structure for a turbine and a compressor that are formed on the same axis, a compressor and a turbine constructed from a permanent magnet generator and formed on the same axis as a rotor shaft of the rotor structure, and a rotor structure for the permanent magnet generator. In the permanent magnet generator, a magnetic circular cylindrical body is inserted on the inner circumferential side of a ring-like permanent magnet split in the axial direction, a non-magnetic circular cylindrical body is shrink fitted on the outer circumference of a rotor shaft processed to the same diameter as the ring-like permanent magnet and of the ring-like permanent magnet, and the ring-like permanent magnet and the rotor shaft are magnetically connected and integrated together by the non-magnetic circular cylindrical body. The inner circumference of both end surfaces of the shrink fitted non-magnetic circular cylindrical body is welded to the outer periphery of the rotor shaft to connect them, thereby corrosive gas and liquid are prevented from entering into the rotor.

Description

Specification

Permanent magnet generator rotor for gas turbine, manufacturing method thereof, gas turbine, and manufacturing method thereof

Technical field

TECHNICAL FIELD [0001] The present invention relates to a permanent magnet generator rotor for a gas turbine, a manufacturing method thereof, a gas turbine configured by arranging a turbine, a compressor, and a permanent magnet generator rotor on the same axis, and a manufacturing method thereof. . In particular, the present invention relates to generator rotors and gas turbine configurations suitable for micro gas turbines and methods for manufacturing them.

Background art

In such a gas turbine, as disclosed in Patent Document 2, a structure in which a generator, a compressor, and a turbine are arranged on the same rotating shaft rotor in the order described above is known. As generators used in such gas turbines, there are many permanent magnet generator rotors in which a permanent magnet is fixed to a rotating rotor. As a permanent magnet generator rotor, Patent Document 1 discloses a generator rotor in which a cylindrical permanent magnet and a bearing portion are shrink-fitted with a non-magnetic cylindrical holder (metal pipe) and integrated together. Has been. Patent Document 2 discloses a microphone port gas turbine in which a generator rotor, a compressor, and a turbine are coaxially connected and integrated with a tie bolt and a nut.

[0003] Patent Document 1: US Pat. No. 4,667,123

Patent Document 2: Japanese Patent Laid-Open No. 2001-012256

Patent Document 3: Japanese Patent Application Laid-Open No. 2004-232232

Disclosure of the invention

Problems to be solved by the invention

[0004] When the permanent magnet assembly is inserted into the pipe-like non-magnetic metal holder and fixed to the generator rotor described in Patent Document 1, it is fixed by shrink fitting. There is a way to do it. In this method, before the permanent magnet assembly is inserted into the pipe-shaped holding body, the permanent magnet assembly is cooled and the pipe-shaped holding body is heated. After the insertion, the holding body is cooled, so that the holding body contracts, and on the contrary, the permanent magnet assembly expands and fixes both. However, the difference between the outer diameter of the permanent magnet assembly and the inner diameter of the holding body is very small, and the force is heated due to the difference in the expansion coefficient in the longitudinal direction between the permanent magnet body and the holding body. It is not easy to quickly and accurately fit the holder and the cooled permanent magnet assembly. For example, the shrink fit may fail just by contacting the inner wall of the holding body during the insertion process of the permanent magnet assembly. This is an obstacle caused by the fact that the mark and stop position for inserting the permanent magnet assembly are not fixed. In addition, since the coefficient of thermal expansion of the permanent magnet assembly and that of the holder are different from each other, unless the position of the permanent magnet assembly in the axial direction is clearly determined when the holder is cooled and the temperature of the permanent magnet assembly is increased, the permanent magnet assembly and the holder are eventually permanent. The positions of both ends of the magnet assembly and the ends of the holder may not match, which may require various post-processing.

As described above, there are various problems in the production and assembly of the conventional shrink-fit type permanent magnet generator rotor. Accordingly, an object of the present invention is to provide a permanent magnet generator rotor with high dimensional accuracy that simplifies the manufacture of a shrink-fit type permanent magnet generator rotor.

Means for solving the problem

[0006] The present invention provides means for defining the end of a non-magnetic cylindrical body (holding body) on the shaft of a shrink-fit type permanent magnet generator rotor, and this means attaches the permanent magnet generator rotor to a pipe-shaped non-magnetic holding body. By accurately regulating the position of the end of the holder when inserted into the holder, the shrink-fitting operation is performed easily and reliably.

The invention's effect

[0007] According to the present invention, when the nonmagnetic cylindrical body is shrink-fitted, the nonmagnetic cylindrical body can be easily and reliably positioned by the restriction portion formed on the rotor shaft, so that the shrink-fitting operation is facilitated. In addition, high precision shrink fitting can be performed. In addition, since both ends of the non-magnetic cylinder are fixed to the rotor shaft by welding, corrosive gas or liquid does not enter the cylinder, and a highly reliable permanent magnet generator rotor can be obtained.

Brief Description of Drawings

FIG. 1 is a partial sectional view of a rotor structure of a permanent magnet generator according to Embodiment 1 of the present invention.

FIG. 2 is a partial cross-sectional view of a rotor structure of a permanent magnet generator showing Embodiment 2 of the present invention. FIG. 3 is a partial cross-sectional view of a rotor structure of a permanent magnet generator showing Embodiment 3 of the present invention.

FIG. 4 is a partial cross-sectional view of a rotor structure of a permanent magnet generator showing Embodiment 4 of the present invention.

FIG. 5 is a partial cross-sectional view of a rotor structure of a permanent magnet generator showing Embodiment 5 of the present invention.

FIG. 6 is a partial cross-sectional view of a rotor structure of a permanent magnet generator showing Embodiment 6 of the present invention.

FIG. 7 is a partial cross-sectional view of a micro gas turbine structure according to Embodiment 7 of the present invention.

Explanation of symbols

[0009] 1 ... rotor structure of permanent magnet generator, 2 ... turbine blade, 3 ... compressor blade, 4 ... connecting shaft, 5 ... connecting nut, 6 ... magnetic pipe, 7 ... compressor Side rotor shaft, 7a: Compressor side of the two-part type compressor side rotor shaft, 7b: End side of the two-part type compressor side rotor shaft, 8 ... Shaft end side rotor shaft, 9 ... Ring shape Permanent magnet, 9a, 9b, 9c, 9d, 9e… Ring-shaped permanent magnet, 10 ··· Nonmagnetic cylinder (metallic pipe), 11 ··· Welding groove (welding groove), 12 ··· Shaft end side penetration depth, 13 ··· Compressor side penetration depth, 13a… Compressor side penetration depth,

13b--'Effective joint area of the weld on the compressor side, 14a-

14b: Inclined part of compressor side end face of non-magnetic metal pipe, 15 ... Welded part, 21 ... Generator stator.

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] An embodiment of the present invention is exemplified as follows.

[0011] 1) A rotor shaft, a large-diameter portion that increases the rigidity of the shaft in the axial length direction, a non-magnetic cylindrical body supported at one end by the large-diameter portion, an inner diameter of the non-magnetic cylindrical body, and a rotor A permanent magnet generator having a plurality of permanent magnet segments fixed between the outer periphery of the shaft and arranged in the axial direction of the rotor shaft, and means for fixing the other end of the nonmagnetic cylindrical body to the rotor shaft Rotor.

[0012] 2) The rotor shaft has a hollow portion in the length direction of the shaft, and is connected to a compressor side rotor shaft connected to a bearing portion adjacent to the large-diameter portion, the permanent magnet segment, and the segment. The rotor of the said permanent magnet generator which has an adjacent shaft end side rotor shaft and is fastened by the connecting shaft inserted in the said hollow part with the connecting nut. The connecting shaft is The entire rotor shaft, compressor shaft, and turbine shaft may be penetrated, or as disclosed in Patent Document 2, it is inserted into a hollow portion that penetrates the generator rotor shaft and the compressor shaft, and this is solid. It may be connected to the turbine shaft.

[0013] 3) The rotor of the permanent magnet generator, wherein one end of the non-magnetic cylindrical body is welded and fixed to the large diameter portion.

[0014] 4) The rotor of the permanent magnet generator, wherein the other end of the nonmagnetic cylindrical body is welded and fixed to the shaft end side rotor shaft.

[0015] 5) The rotor of the permanent magnet generator, in which a welding groove formed at a butt portion of the large diameter portion and the nonmagnetic cylindrical body is welded.

[0016] 6) The rotor of the permanent magnet generator, wherein the other end of the nonmagnetic cylindrical body and the shaft end side rotor shaft are circumferentially welded.

[0017] 7) The rotor of the permanent magnet generator in which the large-diameter portion and the rotor of the nonmagnetic cylindrical body fixing portion are divided.

[0018] 8) The rotor of the permanent magnet generator in which the joint surface between the divided rotor shaft and the nonmagnetic cylindrical body is fixed by welding.

[0019] 9) The rotor of the permanent magnet generator in which the rotor shaft on the inner surface of the groove formed between the large diameter portion and the nonmagnetic cylindrical body and the vicinity of the joint surface of the nonmagnetic cylindrical body are welded.

[0020] 10) The diameter of the end of the rotor shaft continuous to the large diameter portion is reduced, and one end of the nonmagnetic cylindrical body is fixed to the end of the reduced portion, and the nonmagnetic cylindrical body and the rotor shaft are fixed. The rotor of the permanent magnet generator, wherein the reduced portion is overlap-welded.

[0021] 11) The rotor of the permanent magnet generator having a magnetic cylindrical body that is disposed inside the permanent magnet segment and magnetically couples the rotor shaft.

[0022] 12) A gas turbine having a permanent magnet generator rotor having a rotor shaft, a stator disposed on an outer periphery of the rotor, a compressor disposed on an extension line of the rotor shaft, and a turbine. A rotor shaft, a large-diameter portion that increases the axial rigidity of the shaft, a non-magnetic cylindrical body supported at one end by the large-diameter portion, an inner diameter of the non-magnetic cylindrical body, and an outer periphery of the rotor shaft And a plurality of permanent magnet segments arranged in the axial direction of the rotor shaft and means for fixing the other end of the non-magnetic cylindrical body to the rotor shaft. gas turbine.

[0023] 13) The rotor shaft includes a compressor-side rotor shaft connected to a bearing portion adjacent to the large diameter portion, the permanent magnet segment, and a shaft end-side rotor shaft adjacent to the segment. The gas turbine, wherein the compressor, the turbine, and the rotor shaft are fastened by a connecting shaft and a connecting nut inserted into the hollow portion.

[0024] 14) The gas turbine in which one end of the non-magnetic cylindrical body is fixed to the large diameter portion by welding.

[0025] 15) The gas turbine, wherein a plurality of ends of the non-magnetic cylindrical body are fixed to the shaft end side rotor shaft by welding.

[0026] 16) The gas turbine in which a welding groove formed at a butt portion of the large diameter portion and the nonmagnetic cylindrical body is welded.

[0027] 17) The gas turbine, wherein the other end of the nonmagnetic cylindrical body and the shaft end side rotor shaft are circumferentially welded.

[0028] 18) The gas turbine in which the large diameter portion and the rotor of the nonmagnetic cylindrical body fixing portion are divided.

[0029] 19) The gas turbine in which a joint surface between the divided rotor shaft and the nonmagnetic cylindrical body is fixed by welding.

[0030] 20) The gas turbine in which a rotor shaft on an inner surface of a groove formed between the large-diameter portion and the nonmagnetic cylindrical body and a vicinity of a joint surface between the nonmagnetic cylindrical body are welded.

[0031] 21) The diameter of the end of the rotor shaft continuous to the large diameter portion is reduced, and one end of the nonmagnetic cylindrical body is fixed to the end of the reduced portion, and the nonmagnetic cylindrical body and the rotor shaft are fixed. The gas turbine in which the reduced portion is lap welded.

[0032] 22) The gas turbine including a magnetic cylindrical body disposed inside the permanent magnet segment and magnetically coupling the rotor shaft.

[0033] 23) A rotor shaft having a hollow portion and a large diameter portion, a magnetic cylinder inserted into the large diameter portion, a plurality of permanent magnet segments arranged on the outer surface of the magnetic cylinder, and a permanent magnet A shaft end-side rotor arranged in contact with the end of the segment is sequentially laminated, and aligned with the restricting portion (supporting portion) of the non-magnetic cylindrical body formed in or near the large-diameter portion. The body is shrink-fitted, and a non-magnetic cylindrical body is fixed to the permanent magnet segment. A manufacturing method of a permanent magnet generator rotor, wherein a welding groove is formed in a support portion formed in or near a diameter portion, and a nonmagnetic cylindrical body is fixed to the rotor shaft.

[0034] The present invention includes a plurality of ring-shaped permanent magnets 9 arranged in the axial direction on the outer periphery of a magnetic cylindrical body, and rotor shafts 7 and 8 that have the same diameter as the ring-shaped permanent magnets 9. In a rotor structure of a permanent magnet generator in which a nonmagnetic cylindrical body (metal pipe) 10 is shrink-fitted on the outer periphery and the ring-shaped permanent magnet 9 and the rotor shafts 7 and 8 are coupled by the nonmagnetic metal pipe 10, The present invention provides a rotor structure of a permanent magnet generator in which the connection between the nonmagnetic metal nove 10 and the rotor shafts 7 and 8 can be integrated in all use conditions, and a gas turbine using the same.

[0035] The assembly 9 of permanent magnet segments is formed in a ring shape. In general, this type of permanent magnet is made of a sintered body containing a rare earth element as a main component. Therefore, in order to place the permanent magnet as close as possible to the magnetic cylindrical body 6, it is preferable to use a ring shape.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Example 1)

FIG. 1 is a half cross-sectional view of the upper half of a rotor structure 1 of a permanent magnet generator according to an embodiment of the present invention. The rotor shaft includes a shaft end 7 connected to the compressor, a bearing 19 adjacent thereto, a large-diameter portion 30, a plurality of ring-shaped permanent magnets 9, and a magnet disposed at the center of the permanent magnet. It consists of a cylindrical body 6 and a shaft end side rotor shaft 8. A stator 21 is arranged corresponding to the permanent magnet assembly 9, and a casing is arranged on the outer periphery of the stator. Although FIG. 1 shows only one side of the stator 21, it goes without saying that the stator 21 is arranged concentrically with respect to the rotor shaft. Hereinafter, the stator and the casing are omitted in FIGS. An example of a specific configuration such as a stator and a casing of the generator rotor is disclosed in Japanese Patent Laid-Open No. 2004-336917. In the present invention, such a configuration example can be adopted. Further, casings are indispensable for the compressor and the turbine, and an example of the configuration is described in Patent Document 2, for example. Since the case is a well-known matter, a detailed description is omitted.

[0037] As described in Patent Document 1, a plurality of permanent magnet segments or segments and the magnetic cylindrical body 6 can be fixed using an adhesive. In this example, shrink fitting is used. Thus, uniform contact between the permanent magnet segment and the magnetic cylinder 6 is achieved. Also in Patent Document 1, a method of fixing a nonmagnetic cylinder (holding pipe) to a permanent magnet assembly by shrink fitting and welding both ends of the nonmagnetic cylinder to the ends of the rotor shaft. However, as described above, the operation of shrink fitting requires extremely high skill, and the force is performed in such a state that the nonmagnetic cylindrical body cannot be positioned. There is a problem that it is difficult to fit.

[0038] On the right side of the large-diameter portion 30 in the figure, a restricting means 17 for positioning the left end of the nonmagnetic cylindrical body 10 is formed. Thus, when the nonmagnetic cylinder 10 is shrink-fitted onto the permanent magnet assembly 9, the nonmagnetic cylinder can be inserted accurately and reliably. The magnetic cylinder 6 is a means for magnetically connecting the large-diameter portion 30, the permanent magnet assembly 9, and the shaft end 8. An annular hole 25 for inserting the magnetic cylindrical body 6 in the large diameter portion of the rotor shaft and an annular hole 26 in the shaft end 8 portion are also formed so that the magnetic cylindrical body is stably fixed.

[0039] At the contact portion between the large-diameter portion 30 and the nonmagnetic cylindrical body 10, a penetration depth 13 is formed after the shrink fitting, and the welded portion 15 is sealed and fixed. In this case, since an unwelded portion is formed below the penetration depth 13 of the welded portion 15 of the compressor-side welded portion, it is necessary to design the strength as an initial crack. The other end of the nonmagnetic cylindrical body is also sealed with a weld 15 by forming a penetration depth 12. By this welding, it is possible to reliably prevent the entry of corrosive gas and moisture into the non-magnetic cylindrical body, that is, the generator rotor, and a highly reliable generator rotor can be obtained. In the following description, the same reference numerals indicate the same parts. Only the characteristic main parts of each embodiment will be described.

(Example 2)

FIG. 2 is a partial sectional view showing a structure of a generator rotor according to another embodiment of the present invention. The outer peripheral surface side of the end surface of the shaft end side rotor shaft 8 and the inner peripheral surface side of the end surface of the nonmagnetic metal pipe 11 on the shaft end side are welded. The penetration depth of the weld 15 on the shaft end side of the weld 15 in this case is indicated by 12. Compressor-side rotor shaft 7 is a groove for welding with an inclined portion 14a on the compressor-side rotor shaft end surface of the compressor-side rotor shaft 7 at the portion where the compressor-side end surface of shrink-fitted nonmagnetic metal noise 11 contacts (Groove) 11 is provided to widen the outer peripheral side, and the inner peripheral surface of the end surface of the nonmagnetic metal pipe 11 and the outer peripheral surface of the end surface of the rotor shaft can be welded. The In this case, the welded portion 15 by welding is shallow on the inner peripheral surface side of the end surface of the nonmagnetic cylindrical body (metal pipe) 10 and deeper on the outer peripheral surface side of the end surface of the rotor shaft, and the effective joint depth is 13b. .

According to this embodiment, the coupling of both the compressor side rotor shaft 7 and the shaft end side rotor shaft 8 and the non-magnetic metal pipe 10 can be made into an integral structure under all use conditions, and the permanent magnet generator The reliability of the rotor structure can be increased.

(Example 3)

FIG. 3 is a half cross-sectional view of the upper half of the rotor structure 1 of the permanent magnet generator according to the embodiment of the present invention. The compressor-side rotor shaft 7 has an inclined portion 14a on the end surface of the compressor-side rotor shaft at the portion where the compressor-side end surface of the non-magnetic cylindrical body (metal pipe) 10 shrink-fitted with the compressor-side rotor shaft 7 contacts. In addition, a welding groove (groove) 11 with an inclined portion 14b is also provided on the end face including the end face on the compressor side of the nonmagnetic metal pipe so that the outer peripheral side is further opened widely. It is possible to perform welding so that the penetration depth becomes a right angle between the inner peripheral surface side of the end surface and the outer peripheral surface side surface of the end surface of the rotor shaft. The depth 13b is deeper than in the first embodiment.

(Example 4)

FIG. 4 is a half sectional view of the upper half corresponding to the rotor structure 1 of the permanent magnet generator according to the embodiment of the present invention. In the rotor structure 1 of a permanent magnet generator, the compressor-side rotor shaft 7 is divided into two parts, the compressor side 7a and the shaft end side 7b, on the surface including the compressor-side end surface of the non-magnetic metal pipe shrink-fitted with the rotor shaft. To. After the two divided portions are butted and temporarily fixed, the nonmagnetic cylindrical body is shrink-fitted into the permanent magnet assembly, and then the nonmagnetic cylindrical body and the rotor shaft are welded and fixed by separating the butted portion. The inner peripheral surface side of the end surface of the nonmagnetic metal pipe 11 and the outer peripheral surface side of the shaft end side 7b end surface of the compressor side rotor shaft are welded, and after welding, the compressor side 7a and the shaft end side 7b are connected to the connecting shaft. And the compressor-side rotor shaft 7 is configured by connecting with a connecting nut. Also, the shaft end side rotor shaft 8 and the other end of the nonmagnetic cylindrical body are welded and fixed.

(Example 5)

FIG. 4 shows an upper half corresponding to the rotor structure 1 of the permanent magnet generator according to the embodiment of the present invention. FIG. In the rotor structure of a permanent magnet generator, a nonmagnetic metal pipe 11 is shrink-fitted so that one end is fixed to the large diameter part, and then a weld groove is formed at the butt part. The compressor side end is welded to the outer peripheral surfaces of the non-magnetic cylindrical body (metal pipe) 10 and the compressor side port shaft 7.

(Example 6)

FIG. 6 is a half sectional view of the upper half corresponding to the rotor structure 1 of the permanent magnet generator according to the embodiment of the present invention. In the rotor structure of a permanent magnet generator, the diameter of the non-magnetic metal pipe 11 shrink-fitted on the compressor-side motor shaft 7 is reduced, and the non-magnetic cylindrical body (metal pipe) The inner peripheral surface side of the reduced part and the outer peripheral surface side of the rotor shaft are overlap welded.

(Example 7)

FIG. 7 is a partial cross-sectional view showing the structure of a micro gas turbine according to an embodiment of the present invention, in which a permanent magnet generator rotor 1, a compressor 3 and a turbine 2 are arranged on the same axis. They are integrated by a connecting shaft (bolt) 4 and a connecting nut 5 inserted in a hollow portion formed in the port shaft. A stator 21 is arranged corresponding to the permanent magnet of the permanent magnet generator rotor 1 to constitute a generator. One end of the nonmagnetic cylindrical body of the rotor is fixed at the abutting portion with the large diameter portion of the rotor, and is fixed by the welded portion 15. Further, the other end of the nonmagnetic cylindrical body is also fixed to the rotor by the welded portion 15.

The micro gas turbine shown in FIG. 7 is manufactured as follows. The process order can be changed as necessary.

A rotor shaft having a hollow portion and a large diameter portion, a magnetic cylinder inserted into the large diameter portion, a plurality of permanent magnet segments disposed on the outer surface of the magnetic cylinder, and a permanent magnet segment A shaft end side rotor disposed in contact with the end portion is sequentially laminated.

Mouth: The nonmagnetic cylindrical body is shrink-fitted together with the support portion of the nonmagnetic cylindrical body formed at or near the large diameter portion. It is preferable to cool the permanent magnet assembly in advance.

C. A nonmagnetic cylindrical body is fixed to the permanent magnet segment.

2. A welding groove is formed on a support portion formed at or near the large diameter portion. E. A non-magnetic cylindrical body is fixed to the rotor shaft.

F. The permanent magnet generator rotor manufactured as described above, the compressor and the turbine are arranged on one axis, the connecting shaft is passed through, and the connecting nut is integrated together.

G. The stator fixed to the casing is arranged corresponding to the permanent magnet assembly 9 of the permanent magnet generator rotor.

[0042] The gas turbine configured as described above improves the simplification and reliability of the work of inserting and shrink-fitting a nonmagnetic cylinder into a permanent magnet segment, and welding the end of the nonmagnetic cylinder. A highly reliable permanent magnet generator and gas turbine can be provided by fixing. Industrial applicability

The present invention is particularly applicable to a rotor of a permanent magnet generator for a small gas turbine such as a micro gas turbine, and a gas turbine including the generator.

Claims

The scope of the claims

[1] The rotor shaft, the large-diameter portion that increases the rigidity of the shaft in the axial direction, the non-magnetic cylinder supported at one end by the large-diameter portion, the inner diameter of the non-magnetic cylinder, and the rotor shaft Permanent magnet power generation, comprising: a plurality of permanent magnet segments fixed between the outer periphery and an axial direction of the rotor shaft; and means for fixing the other end of the nonmagnetic cylindrical body to the rotor shaft. Rotor of the machine.

[2] The rotor shaft has a hollow portion in a length direction of the shaft, and is adjacent to the compressor side rotor shaft connected to the bearing portion adjacent to the large diameter portion, the permanent magnet segment, and the segment. 2. The permanent magnet generator port according to claim 1, further comprising: a connecting shaft inserted into the hollow portion and a connecting nut.

[3] The one end of the non-magnetic cylindrical body is fixed to the large diameter portion by welding.

The rotor of the permanent magnet generator according to 1.

4. The rotor of a permanent magnet generator according to claim 2, wherein the other end of the nonmagnetic cylindrical body is welded and fixed to the shaft end side rotor shaft.

5. The rotor of a permanent magnet generator according to claim 4, wherein a welding groove formed at a butt portion of the large diameter portion and the nonmagnetic cylindrical body is welded.

6. The rotor of a permanent magnet generator according to claim 2, wherein the other end of the nonmagnetic cylindrical body and the shaft end side rotor shaft are circumferentially welded.

7. The permanent magnet generator according to claim 2, wherein the large-diameter portion and the rotor of the nonmagnetic cylindrical body fixing portion are divided and connected to the connecting shaft by a nut. Rotor.

8. The rotor of a permanent magnet generator according to claim 7, wherein a joint surface between the divided rotor shaft and the nonmagnetic cylindrical body is fixed by welding.

9. The permanent magnet generator according to claim 1, wherein the rotor shaft on the inner surface of the groove formed between the large diameter portion and the nonmagnetic cylindrical body is welded in the vicinity of the joint surface of the nonmagnetic cylindrical body. Rotor.

[10] The diameter of the end of the rotor shaft that continues to the large-diameter portion is reduced, and one end of the nonmagnetic cylindrical body is fixed to the end of the reduced portion, and the reduced portion of the nonmagnetic cylindrical body and the rotor shaft The rotor of a permanent magnet generator according to claim 1, wherein

11. The permanent magnet generator rotor according to claim 1, further comprising a magnetic cylindrical body that is disposed inside the permanent magnet segment and magnetically couples the rotor shaft.

[12] A gas turbine having a permanent magnet generator rotor having a rotor shaft, a stator disposed on the outer periphery of the rotor, a compressor disposed on an extension of the rotor shaft, and a turbine, A rotor shaft, a large-diameter portion that increases the axial rigidity of the shaft, a non-magnetic cylindrical body supported at one end by the large-diameter portion, an inner diameter of the non-magnetic cylindrical body, and an outer periphery of the rotor shaft. A gas turbine comprising: a plurality of permanent magnet segments fixed in between and arranged in an axial direction with the rotor shaft; and means for fixing the other end of the nonmagnetic cylindrical body to the rotor shaft.

[13] The rotor shaft has a hollow portion in a length direction of the shaft, and is adjacent to the compressor side rotor shaft connected to the bearing portion adjacent to the large diameter portion, the permanent magnet segment, and the segment. 13. The gas turbine according to claim 12, further comprising: a shaft end-side rotor shaft, wherein the compressor, the turbine, and the rotor shaft are fastened by a connecting shaft inserted into the hollow portion and a connecting nut. .

14. The gas turbine according to claim 12, wherein one end of the nonmagnetic cylindrical body is fixed to the large diameter portion by welding.

15. The gas turbine according to claim 13, wherein the other end of the nonmagnetic cylindrical body is welded and fixed to the shaft end side rotor shaft.

16. The gas turbine according to claim 14, wherein a welding groove formed at a butt portion of the large diameter portion and the nonmagnetic cylindrical body is welded.

17. The gas turbine according to claim 16, wherein the other end of the nonmagnetic cylindrical body and the shaft end side rotor shaft are circumferentially welded.

18. The gas turbine according to claim 12, wherein the large-diameter portion and the rotor of the fixed portion of the nonmagnetic cylindrical body are divided.

19. The gas turbine according to claim 18, wherein a joint surface between the divided rotor shaft and the nonmagnetic cylindrical body is fixed by welding.

[20] The rotor shaft on the inner surface of the groove formed between the large diameter portion and the nonmagnetic cylindrical body 13. The gas turbine according to claim 12, wherein the vicinity of the joint surface of the magnetic cylindrical body is welded.

[21] The diameter of the end portion of the rotor shaft continuous to the large diameter portion is reduced, and one end of the nonmagnetic cylindrical body is fixed to the end portion of the reduced portion, and the reduced portion of the nonmagnetic cylindrical body and the rotor shaft The gas turbine according to claim 12, which is lap welded.

22. The gas turbine according to claim 12, further comprising a magnetic cylindrical body that is disposed inside the permanent magnet segment and magnetically couples the rotor shaft.

[23] A rotor shaft having a hollow portion and a large-diameter portion, a magnetic cylinder inserted into the large-diameter portion, a plurality of permanent magnet segments disposed on the outer surface of the magnetic cylinder, and a permanent magnet segment The shaft end-side rotor arranged in contact with the end of the non-magnetic cylinder is sequentially laminated, and the non-magnetic cylindrical body is shrink-fitted together with the support portion of the non-magnetic cylindrical body formed in the large-diameter portion or in the vicinity thereof. A nonmagnetic cylindrical body is fixed to the permanent magnet segment, a welding groove is formed at the support portion formed at or near the large diameter portion, and the nonmagnetic cylindrical body is fixed to the rotor shaft. A method for manufacturing a permanent magnet generator rotor.

[24] A rotor shaft having a hollow portion and a large-diameter portion, a magnetic cylinder inserted into the large-diameter portion, a plurality of permanent magnet segments disposed on the outer surface of the magnetic cylinder, and a permanent magnet segment The shaft end side rotor arranged in contact with the end of the

The non-magnetic cylindrical body is shrink-fitted together with the support portion of the non-magnetic cylindrical body formed in the large-diameter portion or in the vicinity thereof,

Fixing a non-magnetic cylindrical body to the permanent magnet segment;

Forming a welding groove in the support portion formed in or near the large diameter portion,

Fixing a non-magnetic cylindrical body to the rotor shaft;

The permanent magnet generator rotor manufactured as described above, the compressor, and the turbine are arranged on one shaft, the connecting shaft is passed through, and the connecting nut is integrally formed.

The stator fixed to the casing is arranged corresponding to the permanent magnet assembly of the permanent magnet generator rotor.

A method for manufacturing a gas turbine.