JP2008061365A - Rotor of vertical-shaft rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a vertical-shaft rotary electric machine which can prevent the deterioration of reliability without causing the breakage of a rim, even if the rim is constituted by laminating a plurality of rim plates which are divided into a plurality of pieces. <P>SOLUTION: In the rotor of the vertical-shaft rotary electric machine; the second rim plate is arranged so as to stride over gaps between divided parts of the first rim located at the outermost side in the rim-laminated direction, and the end of each second rim plate and the end of the first rim plate are joined to each other by welding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotor of a vertical shaft rotating electrical machine, and a cylindrical rim is provided on an outer peripheral portion of a spider extending in a radial direction from a rotary shaft arranged vertically, such as a water turbine generator. The present invention relates to a rotor of a vertical axis rotating electrical machine suitable for one having a plurality of magnetic poles on the outer periphery.

  As shown in FIG. 7, the rotor of the vertical shaft rotating electrical machine is configured to have a rotary shaft 1A arranged vertically, a spider 1 fixed to the rotary shaft 1A and extending in the radial direction, and a cylindrical shape on the outer periphery thereof. The structure has the rim 2 formed. The rim 2 is provided with a plurality of ventilation ducts 3 in the middle in order to ensure an air flow between the inner peripheral side and the outer peripheral side of the rim 2. A duct piece (not shown) is used for the ventilation duct 3 in order to ensure the dimension, and the rim 2 is fastened by a bolt 5 that penetrates together with the duct piece. A plurality of magnetic poles 6 housing the rotor windings 7 are attached to the outer periphery of the rim 2, the centrifugal force of the magnetic pole 6 during operation is supported by the rim 2, and a moment of inertia required by the prime mover can be obtained. It is said.

In addition, for the purpose of adjusting the pumping input, a secondary-excited rotating electric machine corresponding to variable speed operation has been adopted. FIG. 8 shows a rotor of the vertical axis rotating electrical machine for variable speed operation.
The rotor of the vertical shaft rotating electric machine for variable speed operation has the same general configuration as the configuration shown in FIG. 7 described above, but a groove (not shown) for housing the rotor winding 7 on the outer periphery of the rim 2. ) And the span of the rotor winding 7 accommodated in the groove is removed from the rim 2, and the centrifugal force accompanying the rotation is a coil disposed on the outer peripheral side of the span of the rotor winding 7. It is supported by an end support 9. A disk-like structure 12 for supporting the force toward the inner circumference of the rotor winding 7 is disposed on the inner circumference side of the spanning portion of the rotor winding 7. Are tightened by a plurality of rim plates forming the rim 2 and bolts 5 penetrating with the duct piece 4.

  By the way, recent hydroelectric power plants tend to have a high head, a high head and a large output due to the location, and the rotational speed during operation tends to increase. Accordingly, the centrifugal force of the rotor of the vertical axis rotating electric machine is increased, and the rim of the rotor is required to support a large force.

  One method is to use a ring-shaped rim with no divisions in the circumferential direction as the structure of the rotor rim that supports the large force applied to the rim. In spite of high-speed rotation, a design in which the diameter of the rotor is increased is required, and there are cases where a ring-shaped rim cannot be employed due to restrictions on rolling equipment. In addition, a forged lump rim having an integral rotor structure cannot be used in a vertical axis rotating electrical machine with variable transport due to the magnetic characteristics required for the rim of the rotor.

  For this reason, a rotor employing a laminated rim structure in which fan-shaped rim plates divided in the circumferential direction are laminated to form a ring shape is generally used. In a rotor employing a laminated rim structure in which the fan-shaped rim plates divided in the circumferential direction are laminated to form a ring shape, a circumferential tensile force acts on the rim by a centrifugal force accompanying the rotation. However, in the rim using the rim plate divided in the circumferential direction, the circumferential tensile force cannot be transmitted by the divided portion.

  In order to maintain the rotor shape, the divided rim plates must be restrained with a key or the like, or restrained by a bolting frictional force. JP-A-59-76134 is known as a prior art.

JP 59-76134 A

  FIG. 9 is a plan view of the rim when the rim 2 is divided into a plurality of pieces in the circumferential direction (corresponding to the arrow CC in FIG. 8), and FIG. 10 is the rim in the arrow DD in FIG. Sectional drawing of 2 is shown.

As shown in the figure, a rim 2 formed by laminating a plurality of rim plates 2a divided in the circumferential direction and a thick disk-like structure 12 integrated with the rim plate 2a are tightened with bolts 5 together. However, when the rim 2 and the disk-like structure 12 are both constrained by the tightening frictional force of the bolt 5, the following phenomenon occurs. In the figure, 3a is a ventilation duct, 4a and 4b are duct pieces,
Reference numeral 5a denotes a rim fastening bolt hole.

  Centrifugal force acts on the rim 2 and the disc-like structure 12 in the rotor during operation, but the disc-like structure 12 and the rim 2 have different inner and outer diameters and additional masses, so that the radial displacement during rotation is also different. In contrast, slip occurs at the contact boundary between the disc-like structure 12 and the end of the rim 2. By this sliding, the friction between the disc-like structure 12 and the end of the rim 2 is temporarily changed from static friction to dynamic friction, and the frictional restraining force is reduced by the temporary reduction of the friction coefficient, and the rim plate 2a at the end of the rim 2 is reduced. The gaps 20a and 20b of the divided portions are enlarged and shifted in the outer diameter direction. This also affects the rim plate of the layer in contact with the rim plate 2a at the end of the rim 2.

  The generated deviation persists even when there is no centrifugal force at the time of stoppage, and this phenomenon occurs again by repeated operation stop, so that the rim plate 2a moves out by repeating the operation stop, and the shape of the rotor is maintained. May not be possible and may collapse from the end of the rim 2.

  In the case of the variable speed machine, since the groove 8 for inserting the rotor winding 7 is provided on the outer periphery of the rim 2, the rotor winding 7 accommodated in the groove 8 is insulated by the displacement of the rim plate 2a. There arises a problem that the insulation function is deteriorated due to damage and the reliability of the device is lowered.

  The present invention has been made in view of the above points, and its purpose is to reduce reliability without collapsing the rim even if the rim is formed by laminating a plurality of divided rim plates. It is an object of the present invention to provide a rotor for a vertical axis rotating electrical machine that can be prevented.

  In the present invention, in order to achieve the above object, a rotary shaft arranged in a vertical form, a spider extending in a radial direction from the rotary shaft, a cylindrical rim provided on an outer peripheral portion of the spider, A plurality of magnetic poles provided on the outer periphery of the rim, and a plurality of first rim plates made of thin plates divided in the circumferential direction are laminated on the rim, and the divided portions of the first rim plate are arranged in the lamination direction. A rotor of a vertical axis rotating electrical machine which is laminated so as not to coincide with a divided portion of an adjacent rim plate, is formed into a cylindrical shape, and is integrated by being tightened by a bolt, and is the outermost side in the rim stacking direction A second rim plate made of a thin plate is provided so as to straddle the gaps of the respective divided portions of the first rim plate positioned at the first rim plate, and the end portion of each second rim plate and the first rim plate are welded It is characterized by being fixed.

  According to the present invention, even when a rim is formed by laminating a plurality of rim plates divided into a plurality of parts, the end rim can be maintained without slipping out and the rim end can be prevented from collapsing. Thus, it is possible to obtain a rotor of a vertical axis rotating electrical machine that does not decrease.

  Provided is a rotor of a vertical axis rotating electrical machine that prevents a decrease in reliability with a simple configuration.

  1 and 2 show a first embodiment of a rotor of a vertical axis rotating electrical machine according to the present invention. In the configuration of this embodiment shown in the figure, the rim 2 is formed by laminating a plurality of first rim plates 2a made of thin plates divided in the circumferential direction, and the gaps 20a of the divided portions of the first rim plate 2a are laminated. The rotor is formed by being laminated so as not to coincide with the gap 20b of the divided portion of the rim plate adjacent in the direction and formed into a cylindrical shape, and tightened and integrated with the bolt 5 to form the rotor. In the present embodiment, the second rim plate 10 made of a thin plate is formed so as to straddle the gaps 20a of the respective divided portions of the first rim plate 2a located on the outermost side in the stacking direction of the rim 2 in this embodiment. The end of each second rim plate 10 and the first rim plate 2a are welded to the welded portion 11 and fixed. A thick disk-like structure 12 is arranged outside the second rim plate 10 and is tightened together with the disk-like structure 12 with bolts 5.

  In FIG. 2, one of the second rim plates 10 is hatched, but the second rim plate 10 has a shape smaller than that of the first rim plate 2a and the first rim plate 10a. It is formed from the part arrange | positioned ranging over the space | gap 20a of the division part between 10, and the part arrange | positioned in the part in which the space | gap 20a of a division part is not formed.

  With such a configuration, a radial displacement difference between the disc-like structure 12 and the rim 2 is generated by the operation of the rotor, and the friction coefficient between the disc-like structure 12 and the rim plate at the end of the rim 2 is reduced. Even so, since the rim 2 at the end is a ring body, the shape is maintained without slipping out, and the end of the rim 2 can be prevented from collapsing. In addition, the possibility of damage to the rotor winding 7 housed in the magnetic pole groove is reduced, and a highly reliable rotor for a vertical axis rotating electrical machine can be obtained. Further, in assembling the rotor, when fixing the span of the rotor winding 7, the disk-like structure 12 is displaced in the inner diameter direction by the action of the tightening force in the inner diameter direction due to the attachment of the coil end support 9. Although slip occurs at the contact surface with the end portion of the rim 2, it is possible to prevent the displacement of the rim 2 at the end portion by using the rim 2 at the end portion as a ring body.

  FIG. 3 shows a second embodiment of the present invention. In this embodiment shown in the figure, the plurality of second rim plates do not have the second rim plate 10a straddling the gap 20a between the first rim plates 2a and the gap 20a of the first rim plate 2a. And a second rim plate 10b disposed in the portion.

  The second rim plate 10a straddling the gap 20a of the first rim plate 2a and the second rim plate 10b arranged in the portion where the gap 20a of the first rim plate 2a is not provided are respectively the first rim plate 2a. To form an integrated ring structure. The reason for attaching the second rim plate 10b arranged in the portion where the gap 20a of the first rim plate 2a is not present is that the additional mass in the circumferential direction of the first rim plate 2a and the contact surface pressure of the disc-like structure 12 are determined. This is to make it uniform. The welded portion 11 between the first rim plate 2a and the second rim plate may be welded in the same manner as in the first embodiment.

  Even if comprised in this way, the effect is the same as that of the Example mentioned above.

  FIG. 4 shows a third embodiment of the present invention. As shown in the figure, in the present embodiment, a ventilation duct is formed between the disc-like structure 12 and the rim 2 to secure the air flow between the inner peripheral side and the outer peripheral side of the rim 2. A duct piece 12a is provided. Then, a second rim plate 10 is provided between the rim 2 constituted by the first rim plate 2a and the duct piece 12a of the disc-like structure 12, and the second rim plate 10 and the first rim plate 2a are provided. Are welded together at the welded portion 11 and fixed to each other and integrated into a ring shape. The second rim plate 10 has the same structure as that shown in FIG.

  Even if comprised in this way, the effect is the same as that of the Example mentioned above.

  In the fourth embodiment, the second rim plate 10 employed in the rotor structure shown in FIG. 1 is replaced with a second rim straddling the gap 20a between the first rim plates 2a as shown in FIG. It is formed from a plate 10a and a second rim plate 10b arranged in a portion where the gap 20a of the first rim plate 2a is absent.

  The second rim plate 10a straddling the gap 20a of the first rim plate 2a and the second rim plate 10b arranged in the portion where the gap 20a of the first rim plate 2a is not provided are respectively the first rim plate 2a. To form an integrated ring structure. The reason for attaching the second rim plate 10b is to equalize the additional mass in the circumferential direction of the second rim plate 2a and the contact surface pressure of the disc-like structure 12. The welding of the first rim plate 2a and the second rim plate 10 may be performed in the same manner as in the third embodiment.

  Even if comprised in this way, the effect is the same as that of the Example mentioned above.

  The fifth embodiment relates to a place where the first rim plate 2a and the second rim plate 10 are welded, and an example thereof is shown in FIGS.

  In the rotor which is the subject of the present invention, the tightening force of the bolt 5 is always transmitted through the duct piece 4a, so that a large force is applied to the projection surface of the duct piece 4a.

  The present embodiment pays attention to such a characteristic of the structure, and welds the first rim plate 2a and the second rim plate 10 within the projection plane of the duct piece 4a of the rim 2.

  By welding the first rim plate 2 a and the second rim plate 10 on the projection surface of the duct piece 4 a of the rim 2, the integrated first rim plate 2 a and second rim plate 10 Both the adhesive force by welding and the tightening force by the bolt 5 are reliably transmitted, and an effect of obtaining a stronger structure can be obtained.

  One method of welding the first rim plate 2a and the second rim plate 10 is to make a hole for welding in advance on the rim plate located on the upper side in terms of structure, It is conceivable to carry out welding after being put in place.

  Even if comprised in this way, the effect is the same as that of the Example mentioned above.

  A second rim plate made of a thin plate is provided so as to straddle the gaps of the respective divided portions of the first rim plate located on the outermost side in the stacking direction of the rims, and the end portion of each second rim plate and the first By fixing the rim plate to each other by welding, even if the rim is constituted by laminating a plurality of rim plates, it is possible to prevent a decrease in reliability without the rim collapsing.

It is sectional drawing which shows one Example of the rotor of the vertical axis | shaft rotary electric machine of this invention. Example 1 It is a top view of FIG. Example 1 It is a top view which shows the 2nd Example of this invention. (Example 2) It is sectional drawing which shows the 3rd Example of this invention. (Example 3) It is a top view which shows the 5th Example of this invention. (Example 5) It is sectional drawing which shows the 5th Example of this invention. (Example 5) It is sectional drawing which shows an example of the conventional rotor. It is sectional drawing which shows the other example of the conventional rotor. It is a top view which shows the structure of the conventional rim | limb. It is sectional drawing which shows the structure of the conventional rim | limb.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Spider, 2 ... Rim, 2a ... 1st rim board, 3, 3a ... Ventilation duct, 4, 4a, 4b ... Duct piece, 5 ... Bolt, 6 ... Magnetic pole, 7 ... Rotor winding, 8 ... Groove , 9 ... Coil end support, 10 ... Second rim plate, 11 ... Welded portion, 12 ... Disk-like structure, 20a, 20 ... Air gap.

Claims (5)

A rotating shaft arranged in a vertical form, a spider extending radially from the rotating shaft, a cylindrical rim provided on the outer periphery of the spider, and a plurality of magnetic poles provided on the outer periphery of the rim A plurality of first rim plates made of thin plates whose circumferential directions are divided, and the divided portions of the first rim plates coincide with the divided portions of the rim plates adjacent to each other in the stacking direction. In a rotor of a vertical axis rotating electrical machine that is laminated and formed into a cylindrical shape and is tightened and integrated with a bolt,
A second rim plate made of a thin plate is provided so as to straddle the gaps of the respective divided portions of the first rim plate located on the outermost side in the stacking direction of the rims, and the end portion of each second rim plate and the first The rim plate is fixed to the rim plate by welding. In the rotor of the vertical axis rotating electrical machine according to claim 1,
The second rim plate is divided into a plurality of portions in the circumferential direction, and the divided second rim plate is formed with a rim plate and a gap between the divided portions straddling a gap between the divided portions between the first rim plates. A rotor of a vertical axis rotating electrical machine, characterized in that the rotor is formed from a rim plate arranged at a portion not present. In the rotor of the vertical axis rotating electrical machine according to claim 1,
The second rim plate is divided into a plurality of portions in the circumferential direction, and the divided second rim plate has a portion disposed across the space between the divided portions between the first rim plates and a space between the divided portions. A rotor for a vertical axis rotating electrical machine, characterized in that the rotor is formed from what is disposed in a portion where it is not formed. In the rotor of the vertical axis rotating electrical machine according to claim 1,
A duct piece is arranged in the middle of the laminating direction of the first rim plate to form a ventilation duct, and the end of the second rim plate and the first rim plate are welded to each other in the projection plane of the duct piece. The rotor of a vertical axis | shaft rotary electric machine characterized by the above-mentioned. In the rotor of the vertical axis rotating electrical machine according to claim 4,
A thick plate-like structure is disposed outside the second rim plate, and the thick plate-like structure is brought into contact with the second rim plate within the projection plane of the duct piece and is integrally tightened. The rotor of the vertical axis | shaft rotary electric machine characterized by the above-mentioned.

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