Claims
- 1. A rotor shaft of an electric rotary machine of large capacity, said rotor shaft including a body portion having a slot in which to embed a coil in an axial direction, and a flange portion for transmitting and receiving power,
- wherein said body portion of said shaft has a diameter of more than 1 m and a length of 5.5 to 6.5 times the diameter of said body.
- 2. A rotor shaft of an electric rotary machine of large capacity, said rotor shaft including a body portion having a slot in which to embed a coil in an axial direction, and a flange portion for transmitting and receiving power,
- wherein said rotor shaft has a tensile strength at room temperature of 93 kg/mm.sup.2 or more, a 50% fracture appearance, transition temperature of less than 0.degree. C. and a magnetic susceptibility at 21.2 kG and 20.2 kG of less than 985 AT/cm and less than 395 AT/cm, respectively; and
- wherein said body portion of said shaft has a diameter of more than 1 m and a length of 5.5 to 6.5 times the diameter of said body.
- 3. A rotor shaft of an electric rotary machine of large capacity according to claim 2, wherein said electric rotary machine is an electric generator to be driven by a turbine and has a capacity of more than 1,000 MVA.
- 4. A rotor shaft of an electric rotary machine of large capacity according to claim 2, wherein said diameter D (mm) is less than 0.28 mm per generator output of 1 MVA plus 900 mm and more than 0.15 mm per generator output of 1 MVA plus 1,000 mm.
- 5. A rotor shaft of an electric rotary machine of large capacity according to claim 2, wherein said diameter D (mm) is set relative to rotation speed of said shaft so that the value (D.sub.2 .times.R.sup.2) obtained from the relationship with the rotation speed R (rpm) of said shaft is 1.7 to 3.0.times.10.sup.8.
- 6. A large capacity electric rotary machine outputting more than 1,000 MVA, equipped with a stator constituted of a laminated iron core in which a coil is embedded and a rotor rotating within the stator, said rotor including a shaft a body portion of which has a slot embedding therein a coil in an axial direction, wherein said body portion of said rotor has a diameter of more than 1 m and a length of 5.5 to 6.5 times the body diameter, and the floor area required for the installation is 0.08 to 0.09 m.sup.2 per 1 MVA.
- 7. A large capacity electric rotary machine according to claim 6, wherein said shaft of said rotor has a tensile strength at room temperature of 93 kg/mm.sup.2 or more, a 50% fracture appearance transition temperature of less than 0.degree. C. and a magnetic susceptibility at 21.2 kG and 20.2 kG of less than 985 AT/cm and less than 395 AT/cm, respectively.
- 8. A large capacity electric rotary machine outputting more than 1,000 MVA and equipped with a stator and a rotor, wherein the stator current is 19.0 to 22.5 A per 1 MVA of the output while said stator is directly water-cooled, said rotor is cooled by hydrogen pressure of 0.0003 to 0.005 kg/cm.sup.2.g per 1 MVA and said rotor has a shaft a body portion of which has a slot formed therein in an axial direction and holding a coil, the diameter of said body portion being more than 1.15 m and the length of said body portion being 5.5 to 6.5 times the diameter.
- 9. A large capacity electric rotary machine according to claim 7, wherein said shaft of said rotor has a tensile strength at room temperature of 93 kg/mm.sup.2 or more, a 50% fracture appearance transition temperature of less than 0.degree. C. and a magnetic susceptibility at 21.2 kG and 20.2 kG of less than 985 AT/cm and less than 395 AT/cm, respectively.
- 10. An electric rotary machine rotor shaft according to claim 2, wherein said shaft is formed of forged Ni-Cr-Mo-V alloy steel having substantially entire bainite structure.
- 11. An electric rotary machine rotor shaft according to claim 2, wherein said shaft is formed of high strength forged Ni-Cr-Mo-V alloy steel having substantially entire bainite structure, whose 50% fracture appearance transition temperature is less than -60.degree. C.
- 12. A large capacity electric rotary machine according to claim 9, wherein said shaft of said rotor is formed of high strength forged Ni-Cr-Mo-V alloy steel having substantially entire bainite structure.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-057087 |
Mar 1991 |
JPX |
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Parent Case Info
This application is a continuation application of application Ser. No. 160,651, filed Dec. 2, 1993 (now U.S. Pat. No. 5,437,742), which application is a continuation application of application Ser. No. 852,567, filed Mar. 17, 1992 (now U.S. Pat. No. 5,288,455).
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4985201 |
Chang et al. |
Jan 1991 |
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5108699 |
Bodnar et al. |
Apr 1992 |
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Continuations (2)
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Number |
Date |
Country |
Parent |
160651 |
Dec 1993 |
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Parent |
852567 |
Mar 1992 |
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