JP2005027440A - Rotor of rotating electric machine and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To weld a pair of rotating shafts which constitute the rotor of a generator, and the main body of the rotor with each other in high strength with accuracy. <P>SOLUTION: The rotor 15 of the generator is equipped with a pair of shafts 22, a pipe-shaped rotor main body 27, a pair of discoid plate 25 caught between the shaft 22 and the rotor main body 27, and a permanent magnet 28 housed in the rotor main body 27. The inner end of the shaft 22 and the outer end of the rotor main body 27 are engaged with the periphery of the plate 25 via steps A and B, respectively, and the shaft 22 and the rotor main body 27 are welded with each other with the periphery of the plate 25 as a liner. Consequently, the accuracy in assembly of the rotor 15 can be raised by accurately positioning the plate 25, the shaft 22, and the rotor main body 27 on an axis, and further it can prevent the permanent magnet 28 from being melted and alloyed by the heat of welding, thereby securing the strength of welding. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor of a rotating electrical machine in which a plurality of members are assembled by welding, and a method for manufacturing the rotor of the rotating electrical machine.
[0002]
[Prior art]
According to the following Patent Document 1, a rotor of a generator driven by a stationary gas turbine engine is configured by supporting a plurality of permanent magnets on the outer periphery of a magnet holder fixed between front and rear rotating shafts. It is known.
[0003]
Also, when manufacturing a pressure vessel by welding a pair of outer shell components and a partition wall, the outer periphery of the partition wall located inside the connecting portion of the pair of outer shell components is used as a backing metal for welding. This is known from Patent Document 2 below.
[0004]
[Patent Document 1]
Japanese Patent No. 3030689 [Patent Document 2]
Japanese Patent Laid-Open No. 11-190495
[Problems to be solved by the invention]
By the way, in order to reduce the weight by boring the shaft of the rotor of the generator, the rotor is divided into a rotor body that houses a permanent magnet inside and a pair of shafts that are welded to both ends of the rotor body. It is conceivable to configure. In this case, if the positioning when welding the rotor main body and the pair of shafts is not performed accurately, the axis of the rotor main body and the axis of the shaft are shifted, and vibration may occur when the rotor rotates. Further, when the permanent magnet housed in the rotor body is melted by the heat of welding when the welding is performed, the rotor body and the shaft and the permanent magnets of different materials are mixed and alloyed to form a welded portion. There is a possibility that the strength of the material will decrease.
[0006]
The present invention has been made in view of the above-described circumstances, and an object thereof is to weld a pair of rotating shafts and a rotor body constituting a rotor of a rotating electrical machine with high accuracy and high strength.
[0007]
[Means for Solving the Problems]
To achieve the above object, according to the first aspect of the present invention, first and second shafts having inner ends facing each other formed in an annular shape, a pipe-shaped rotor body, and a first The disc-shaped first and second plates sandwiched between the inner end portion of the second shaft and the outer end portions of the rotor body are different from the first and second shafts, the rotor body, and the first and second plates. A rotor of a rotating electrical machine comprising a member to be stored that is made of a material and is stored inside the rotor body, wherein the inner end portion of the first shaft and one outer end portion of the rotor body are respectively disposed on the first plate. The first shaft and the rotor body are welded with the outer peripheral surface of the first plate as a backing metal, and the second plate is connected to the inner end of the second shaft and the other outer side of the rotor body. The end portions are fitted through the stepped portions, respectively, and the second shaft is The rotor of the rotating electrical machine, characterized in that the bets and the rotor body were welded to the outer peripheral surface of the second plate as backing metal is proposed.
[0008]
According to the above configuration, the inner ends of the first and second shafts and the outer ends of the rotor main body are fitted to the first and second plates via the stepped portions, respectively. Thus, the first and second shafts and the rotor main body can be accurately positioned on the axis, and the assembly accuracy of the rotor can be improved. Further, since the first and second shafts and the rotor body are welded with the outer peripheral surfaces of the first and second plates as backing metal, the member to be accommodated is melted by the heat of welding, and the first, second shaft, rotor body, and It is possible to prevent alloying with the first and second plates and to secure the welding strength.
[0009]
According to the invention described in claim 2, in addition to the structure of claim 1, the interiors of the first and second shafts are bored, and the openings are closed by the first and second plates. A rotor of a rotating electrical machine characterized by forming the above is proposed.
[0010]
According to the above configuration, since the hollow portions are formed between the first and second plates by boring the insides of the first and second shafts, it is possible to reduce the weight of the rotor and enable high-speed rotation. .
[0011]
According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a rotor for a rotating electrical machine is proposed in which the member to be stored is a permanent magnet.
[0012]
According to the above configuration, since the member to be stored is a permanent magnet, it is possible to prevent the permanent magnet from melting and alloying with the first, second shaft, first, second plate, and rotor body during welding. it can.
[0013]
According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects, the rotating electrical machine is a generator driven by a gas turbine engine. A rotor of a rotating electric machine is proposed.
[0014]
According to the above configuration, since the accuracy of the axis of the rotor of the generator is increased, the generation of vibration can be suppressed even if the generator is driven by the gas turbine engine and the rotor is rotated at a high speed.
[0015]
According to the fifth aspect of the present invention, the first and second shafts, the pipe-shaped rotor main body, and the inner ends of the first and second shafts, the inner ends facing each other are formed in an annular shape. The rotor main body is made of a material different from the disc-shaped first and second plates and the first and second shafts, the rotor main body, and the first and second plates sandwiched between the outer end portions of the rotor portion and the rotor main body. A rotor for a rotating electrical machine having a member to be stored therein, the step of fitting the inner end of the first shaft and one outer end of the rotor body into the first plate; A step of fitting the inner end portion of the second shaft and the other outer end portion of the rotor body to the second plate, and a gap formed between the first shaft and the rotor body on the outer peripheral surface of the first plate. A process of welding as a backing metal, a second shaft and a rotor body The rotor manufacturing method of the rotary electric machine, which comprises a step of welding the formed gap the outer circumferential surface of the second plate as backing metal while is proposed.
[0016]
According to the above configuration, the inner ends of the first and second shafts and the outer ends of the rotor body are fitted to the first and second plates, and formed between the first and second shafts and the rotor body. Since the gaps are welded with the outer peripheral surfaces of the first and second plates as backing metal, the member to be accommodated is melted by the heat of welding, and the first and second shafts, the rotor body, and the first and second plates are alloyed. The strength of welding can be ensured by preventing the deformation. Furthermore, since the distortion during welding of the first and second shafts and the rotor body can be absorbed by the gap, the extra thickness previously added to remove the distortion generated during welding in the processing after welding is increased. 1. It can be eliminated from the second plate and the rotor body, and the number of processing steps can be reduced.
[0017]
According to the sixth aspect of the present invention, in addition to the configuration of the fifth aspect, a method for manufacturing a rotor of a rotating electrical machine is proposed in which the member to be stored is a permanent magnet.
[0018]
According to the above configuration, since the member to be stored is a permanent magnet, it is possible to prevent the permanent magnet from melting and alloying with the first, second shaft, first, second plate, and rotor body during welding. it can.
[0019]
In addition, the permanent magnet 28 of an Example respond | corresponds to the to-be-stored member of this invention, and the generator G of an Example respond | corresponds to the rotary electric machine of this invention.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0021]
1 to 4 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a generator, FIG. 2 is a longitudinal sectional view of a rotor of the generator, FIG. 3 is an enlarged view of a part 3 in FIG. FIG. 4 is a view corresponding to FIG. 3 before the welding process.
[0022]
As shown in FIG. 1, a generator G driven by a gas turbine engine includes a casing 11 with one end opened, and an end cover 13 that closes the opening of the casing 11 and is fixed with bolts 12. The stator 14 and the rotor 15 are accommodated in the casing 11.
[0023]
The stator 14 fixed to the inner peripheral surface of the casing 11 with bolts 16... Includes a stator core 17 in which a large number of steel plates are laminated, and a coil 19 wound around the stator core 17 via a bobbin 18. Power is supplied to 19 through a harness 20.
[0024]
As is clear from FIG. 2, the rotor 15 disposed inside the stator 14 includes a first shaft 22 in which a small-diameter portion 22 a outside the axis L direction is supported by the end cover 13 via a roller bearing 21. The small-diameter portion 24a outside the axis L direction is coupled to the second shaft 24 supported by the casing 11 via the ball bearing 23, and the annular large-diameter portion 22b formed inside the first shaft 22 in the axis L direction. The disc-shaped first plate 25, the disc-shaped second plate 26 coupled to the annular large-diameter portion 24b formed on the inner side in the axis L direction of the second shaft 24, the first plate 25, and A pipe-shaped rotor main body 27 having both outer ends in the axis L direction coupled to the second plate 26, and a plurality of permanent magnets 28 fixed to the inner surface of the rotor main body 27 are provided.
[0025]
The insides of the large-diameter portions 22b and 24b of the first and second shafts 22 and 24 are bored, and the first and second shafts 22 are closed by closing the openings with the first and second plates 25 and 26. , 24 are formed with hollow portions 22d, 24d. By forming the hollow portions 22d and 24d in the first and second shafts 22 and 24, the rotor 15 can be reduced in weight and can be rotated at high speed.
[0026]
The first shaft 22 includes a pipe-like support portion 22c protruding in the direction of the axis L from the center of the large-diameter portion 22b. The outer periphery of the first shaft 22 includes the opening 25a of the first plate 25, the inner periphery of the permanent magnets 28, and so on. The opening 26a of the second plate 26 is supported. Therefore, the permanent magnets 28 are accommodated in a space defined by the rotor body 27, the first plate 25, the second plate 26, and the support portion 22c of the first shaft 22. The outer peripheral surface of the rotor body 27 is opposed to the inner peripheral surface of a pipe-shaped coil cover 29 surrounding the inner side in the radial direction of the coil 19 with a slight air gap.
[0027]
As is apparent from FIG. 4, the inner periphery of the large-diameter portion 22b of the first shaft 22 is fitted and positioned on the annular step A formed on the outer surface of the first plate 25 in the axis L direction, and the rotor body The inner surface of the first plate 25 in the direction of the axis L is fitted and positioned on the annular step B formed at the outer end of the one of the axes L in the direction of the axis L. The first shaft 22 and the rotor body 27 are precisely positioned on the axis L by the positioning action of the two step portions A and B. Further, by setting the thickness t of the outer peripheral portion of the first plate 25 to a plus tolerance and setting the depth d of the stepped portion B of the rotor body 27 to a minus tolerance, the end surface of the first shaft 22 and the rotor body 27 A gap α of several tens of μm is formed between the end faces, and the bottom of the gap α faces the outer peripheral surface of the first plate 25.
[0028]
As shown in FIG. 3, the first shaft 22, the rotor body 27, and the first plate 25 are integrated by laser welding the gap α. At this time, the outer peripheral surface of the first plate 25 that closes the bottom of the gap α functions as a backing metal, so that the weld beads 30 can be prevented from reaching the permanent magnets 28. Accordingly, it is possible to prevent the permanent magnets 28 made of different materials from being alloyed with respect to the first shaft 22, the rotor main body 27, and the first plate 25 made of, for example, Inconel, thereby reducing the welding strength.
[0029]
The welding of the first shaft 22, the rotor main body 27, and the first plate 25 has been described above, but the structure and operation of the second shaft 24, the rotor main body 27, and the second plate 26 are substantially the same. is there.
[0030]
As described above, the first shaft 22 and the rotor main body 27 are fitted to the first plate 25 through the step portions A and B, and the second shaft 24 and the rotor main body 27 are connected to the second plate 26 at the step portions A and B. Since the fitting is performed via B, the first shaft 22, the rotor main body 27, and the second shaft 24 can be precisely positioned on the axis L, and the balance during rotation of the rotor 15 can be increased. Thereby, generation | occurrence | production of the vibration at the time of rotation of the rotor 15 of the generator G driven with the gas turbine engine E of high rotation can be prevented effectively. In addition, by forming a gap α in the welded portion in advance, distortion during welding of the first and second shafts 22 and 24 and the rotor body 27 can be absorbed by the gap α. Conventionally, in order to remove distortion generated during welding in the post-welding process, an extra thickness is previously added to the first and second plates 25 and 26 and the rotor body 27. Therefore, it is not necessary to add an extra thickness in advance, and the number of processing steps can be reduced accordingly.
[0031]
Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.
[0032]
For example, in the embodiment, the rotor 15 of the generator G is illustrated, but the present invention can also be applied to a rotor of an electric motor.
[0033]
In the embodiment, the generator G is driven by the gas turbine engine. However, the generator G can be driven by another arbitrary drive source.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the inner ends of the first and second shafts and the outer ends of the rotor body are fitted to the first and second plates via the stepped portions, respectively. Therefore, the first and second shafts and the rotor body can be accurately positioned on the axis via the first and second plates, and the assembly accuracy of the rotor can be increased. Further, since the first and second shafts and the rotor body are welded with the outer peripheral surfaces of the first and second plates as backing metal, the member to be accommodated is melted by the heat of welding, and the first, second shaft, rotor body, and It is possible to prevent alloying with the first and second plates and to secure the welding strength.
[0035]
According to the invention described in claim 2, since the hollow portions are formed between the first and second plates by boring the insides of the first and second shafts, the rotor is reduced in weight and rotated at a high speed. Can be made possible.
[0036]
According to the invention described in claim 3, since the member to be stored is a permanent magnet, the permanent magnet is melted during welding and alloyed with the first, second shaft, first, second plate and rotor body. Can be prevented.
[0037]
Further, according to the invention described in claim 4, since the accuracy of the axis of the rotor of the generator is increased, generation of vibration can be suppressed even when the generator is driven by a gas turbine engine and the rotor is rotated at a high speed. it can.
[0038]
According to the invention described in claim 5, the inner ends of the first and second shafts and both outer ends of the rotor body are fitted to the first and second plates, and the first and second shafts Since the gap formed between the rotor body and the outer peripheral surface of the first and second plates is welded to the backing metal, the member to be accommodated is melted by the heat of welding, and the first, second shaft, rotor body and first 1. It is possible to prevent the alloying with the second plate and to secure the welding strength. Furthermore, since the distortion during welding of the first and second shafts and the rotor body can be absorbed by the gap, the extra thickness previously added to remove the distortion generated during welding in the processing after welding is increased. 1. It can be eliminated from the second plate and the rotor body, and the number of processing steps can be reduced.
[0039]
According to the invention described in claim 6, since the member to be stored is a permanent magnet, the permanent magnet is melted at the time of welding and alloyed with the first, second shaft, first, second plate and rotor body. Can be prevented.
[Brief description of the drawings]
1 is a longitudinal sectional view of a generator. FIG. 2 is a longitudinal sectional view of a rotor of a generator. FIG. 3 is an enlarged view of a part 3 in FIG. 2. FIG. 4 is a view corresponding to FIG. Explanation of]
22 1st shaft 22d hollow part 24 2nd shaft 24d hollow part 25 1st plate 26 2nd plate 27 Rotor main body 28 Permanent magnet (member to be stored)
A Step B Step D G Generator (Rotating electric machine)
α gap

Claims (6)

Inner ends of the first and second shafts (22, 24), the pipe-shaped rotor body (27), and the first and second shafts (22, 24) having inner ends facing each other in an annular shape. Disk-shaped first and second plates (25, 26), first and second shafts (22, 24), and rotor body (27) sandwiched between the outer end portions of the rotor portion and the rotor body (27). And a rotor of a rotating electrical machine including a member to be stored (28) configured of a material different from that of the first and second plates (25, 26) and stored in the rotor body (27),
The inner end of the first shaft (22) and one outer end of the rotor body (27) are fitted to the first plate (25) via the stepped portions (A, B), respectively, and the first shaft (22 ) And the rotor body (27) are welded with the outer peripheral surface of the first plate (25) as a backing metal, and the inner end of the second shaft (24) and the rotor body (27) are attached to the second plate (26). The other outer end portions of the second plate (26) and the rotor body (27) are fitted with the outer peripheral surface of the second plate (26) as a backing metal. A rotor of a rotating electrical machine characterized by welding. The inside of the first and second shafts (22, 24) is bored, and the openings are closed by the first and second plates (25, 26) to form hollow portions (22d, 24d). The rotor of the rotating electrical machine according to claim 1. The rotor of a rotating electrical machine according to claim 1 or 2, wherein the member to be stored is a permanent magnet (28). The rotor of a rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is a generator (G) driven by a gas turbine engine. Inner ends of the first and second shafts (22, 24), the pipe-shaped rotor body (27), and the first and second shafts (22, 24) having inner ends facing each other in an annular shape. Disk-shaped first and second plates (25, 26), first and second shafts (22, 24), and rotor body (27) sandwiched between the outer end portions of the rotor portion and the rotor body (27). And a method of manufacturing a rotor of a rotating electrical machine including a member to be housed (28) that is made of a material different from that of the first and second plates (25, 26) and is housed in the rotor body (27). ,
Fitting the inner end of the first shaft (22) and one outer end of the rotor body (27) to the first plate (25);
Fitting the inner end of the second shaft (24) and the other outer end of the rotor body (27) to the second plate (26);
Welding a gap (α) formed between the first shaft (22) and the rotor body (27) with the outer peripheral surface of the first plate (25) as a backing metal;
Welding a gap (α) formed between the second shaft (24) and the rotor body (27) with the outer peripheral surface of the second plate (26) as a backing metal;
The manufacturing method of the rotor of the rotary electric machine characterized by including these. The method for manufacturing a rotor of a rotating electric machine according to claim 5, wherein the member to be stored is a permanent magnet (28).

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