Claims
- 1. An electric rotary machine rotor shaft equipped with a body having a slot in which to embed a coil in an axial direction, and a flange and a bearing for transmitting and receiving power, wherein the shaft is formed of Ni--Cr--Mo--V alloy steel comprising 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V whose tensile strength at room temperature is 93 kg/mm.sup.2 or more, whose 50% fracture appearance transition temperature is less than 0.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less than 395 respectively; the diameter of said body being more than 1 m and the length of said body being 5.5 to 6.0 times the diameter of said body.
- 2. An electric rotary machine rotor shaft equipped with a body having a slot in which to embed a coil in an axial direction, and a flange and a bearing for transmitting and receiving power, wherein said shaft is formed of high strength Ni--Cr--Mo--V alloy steel comprising 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V and body diameter is more than 1 m and length of the body is 5.5 to 6.0 times said diameter, and said body diameter D (mm) is less than 0.2 mm per generator output of 1 MVA plus 900 mm and more than 0.2 mm per generator output of 1 MVA plus 1,000 mm.
- 3. An electric rotary machine rotor shaft equipped with a body having a slot in which to embed a coil in an axial direction, and a flange and a bearing for transmitting and receiving power, wherein said shaft is formed of high strength Ni--Cr--Mo--V alloy steel comprising 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V and body diameter D(m) is more than 1 m and length of the body is 5.5 to 6.0 times said body diameter while said body diameter is set against rotation speed of the shaft so that the value (D.sup.2 .times.R.sup.2) obtained from the relationship with the rotation speed R(rpm) of the shaft is 1.7 to 3.0 .times.10.sup.8.
- 4. An electric rotary machine rotor shaft comprising a solid shaft formed of high strength, high toughness Ni--Cr--Mo--V alloy steel comprising 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V whose tensile strength at room temperature is more than 93 Kg/mm.sup.2, whose 50% fracture appearance transition temperature is less than -60.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less that 395 AT/cm, respectively.
- 5. 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, wherein the shaft of said rotor is formed of high strength Ni--Cr--Mo--V low alloy steel comprising 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V and includes a coil, the diameter of the shaft is more than 1 m, the length of the shaft is 5.5 to 6.0 times the diameter and the floor area required for the installation is 0.08 to 0.09 m.sup.2 per 1 MVA.
- 6. A large capacity electric rotary machine outputting more than 1,000 MVA and equipped with a rotor shaft and stator, wherein the stator current is 19.0 to 22.5 A per 1 MVA of the output while the stator is directly water cooled, the rotor shaft is cooled by hydrogen pressure of 0.003 to 0.005 kg/cm2.g per 1 MVA and the rotor shaft is formed of high strength Ni--Cr--Mo--V alloy steel comprising 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V and has a diameter of more than 1.15 m.
- 7. An electric rotary machine rotor shaft equipped with a body having a slot in which to embed a coil in an axial direction, and a flange and a bearing for transmitting and receiving power, wherein the shaft is formed of forged Ni--Cr--Mo--V alloy steel having substantially entire bainite structure, whose tensile strength at room temperature is 93 kg/mm.sup.2 or more, whose 50% fracture appearance transition temperature is less than 0.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less than 395 AT/cm, respectively, the diameter of said body being more than 1 m and the length of said body being 5.5 to 6.0 times the diameter of said body; said forged Ni--Cr--Mo--V alloy steel comprising 0.15 to 0 3 wt % C, less than 0.1 wt % Si, less than 1 wt % Mn, 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V.
- 8. An electric rotary machine rotor shaft equipped with a body having a slot in which to embed a coil in an axial direction, and a flange and a bearing for transmitting and receiving power, wherein the shaft is formed of forged Ni--Cr--Mo--V alloy steel having substantially entire bainite structure, whose tensile strength at room temperature is 93 kg/mm.sup.2 or more, whose 50% fracture appearance transition temperature is less than 0.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less than 395 AT/cm, respectively, the diameter of said body being more than 1 m and the length of said body being 5.5 to 6.0 times the diameter of said body; said forged Ni--Cr--Mo--V alloy steel comprising 0.15 to 0.3 wt % C, less than 0.1 wt % Si, less than 1 wt % Mn, 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V.
- 9. An electric rotary machine rotor shaft equipped with a body having a slot in which to embed a coil in an axial direction, and a flange and a bearing for transmitting and receiving power, wherein the shaft is formed of high strength forged Ni--Cr--Mo--V alloy steel having substantially entire bainite structure, whose tensile strength at room temperature is 93 kg/mm.sup.2 or more, whose 50% fracture appearance transition temperature is less than 0.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less than 395 AT/cm, respectively, the diameter of said body being more than 1 m and the length of said body being 5.5 to 6.0 times said diameter, while said body diameter is set against rotation speed of the shaft so that the value (D.sup.2 .times.R.sup.2) obtained from the relationship with the rotation speed R (rpm) of the shaft is 1.7 to 3.0.times.10.sup.8 ; said forged Ni--Cr--Mo--V alloy steel comprising 0.15 to 0.3 wt % C, less than 0.1 wt % Si, less than 1 wt % Mn, 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V.
- 10. An electric rotary machine rotor shaft comprising a solid shaft formed of high strength, high toughness forged Ni--Cr--Mo--V alloy steel having substantially entire bainite structure, whose tensile strength at room temperature is 93 kg/mm.sup.2 or more, whose 50% fracture appearance transition temperature is less than -60.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less than 395 AT/cm, respectively; said forged Ni--Cr--Mo--V alloy steel comprising 0.15 to 0.3 wt % C, less than 0.1 wt % 0.1 Si, less than 1 wt % Mn, 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V.
- 11. 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, wherein the shaft of said rotor is formed of high strength forged Ni--Cr--Mo--V low alloy steel having substantially entire bainite structure, whose tensile strength at room temperature is 93 kg/mm.sup.2 or more, whose 50% fracture appearance transition temperature is less than 0.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less than 395 AT/cm, respectively, and includes a coil, the diameter of the shaft is more than 1 m, the length of the shaft is 5.5 to 6.0 times the shaft diameter and the floor area required for the installation is 0.08 to 009 m.sup.2 per 1 MVA; said forged Ni--Cr--Mo--V alloy steel comprising 0.15 to 0.3 wt % C, less than 0.1 wt % Si, less than 1 wt % Mn, 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V.
- 12. A large capacity electric rotary machine outputting more than 1,000 MVA and equipped with a stator and a rotor shaft, wherein the stator current is 19.0 to 22.5 A per 1 MVA of the output while the stator is directly water cooled, the rotor shaft is cooled by hydrogen pressure of 0.003 to 0.005 kg/cm.sup.2.g per 1 MVA and the rotor shaft is formed of high strength forged Ni--Cr--Mo--V alloy steel having substantially entire bainite structure, whose tensile strength at room temperature is 93 kg/mm.sup.2 or more, whose 50% fracture appearance transition temperature is less than 0.degree. C. and whose magnetic susceptibility at 21.2 kG and 20.2 kG is less than 985 AT/cm and less than 395 AT/cm, respectively, and has a diameter of more than 1.15 m; said forged Ni--Cr--Mo--V alloy steel comprising 0.15 to 0.3 wt % C, less than 0.1 wt % Si, less than 1 wt % Mn, 3 to 5 wt % Ni, 2 to 3.5 wt % Cr, 0.1 to 1.0 wt % Mo and 0.03 to 0.35 wt % V.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-057087 |
Mar 1991 |
JPX |
|
Parent Case Info
This application is a Continuation application of application Ser. No. 852,567, filed Mar. 17, 1992, now U.S. Pat. No. 5,288,567.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4477280 |
Shiga et al. |
Oct 1984 |
|
5108699 |
Bodnar et al. |
Apr 1992 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
852567 |
Mar 1992 |
|