JP6370819B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine with increased frame rigidity.

  In a rotating electrical machine, the rotation of the rotor generates an oscillating force on the rotating electrical machine. That is, when the rotation speed is n [1 / sec], the vibration source has a frequency of f [Hz] = n. For example, in the case of a quadrupole, the frequency is 25 Hz or 30 Hz, and in the case of a dipole, the frequency is 50 Hz or 60 Hz.

  Generally, a frame of a rotating electrical machine is designed to be rigid to some extent. That is, it is designed to have a natural frequency of at least about 20 Hz to 30 Hz or higher.

JP 2001-128410 A

  Usually, the frame of a rotating electrical machine is made of a plate material. The frame is a portion with low rigidity in the constituent elements of the rotating electrical machine, and is a main part that determines the rigidity of the rotating electrical machine. In the case of a quadrupole, the frequency resulting from the rotation of the rotor is about 25 Hz or 30 Hz. Therefore, it is relatively easy to make the natural frequency sufficiently higher than these. Partially, a portion having low rigidity can be dealt with by increasing the thickness of the portion. Alternatively, there is a method of adding a reinforcing material in order to increase the rigidity of the frame (see Patent Document 1).

  On the other hand, in the case of a dipole, it is necessary to set the natural frequency to avoid resonance with the frequency of 50 Hz or 60 Hz. In this case, it is conceivable that the natural frequency of the rotating electrical machine is set to a region lower than or higher than the frequency of 50 Hz or 60 Hz.

  In the case of a low region, a resonance state always occurs at the time of starting the rotating electric machine, but this is not preferable and should basically be avoided. Therefore, it is desirable to set the natural frequency of the rotating electrical machine to a region higher than the frequency of 50 Hz or 60 Hz.

  On the other hand, it may be difficult in practice to secure rigidity such that the natural frequency of the fully-closed rotating electrical machine made of a plate material is higher than the frequency of 50 Hz or 60 Hz.

  The frame also has a function of supporting a bearing bracket that supports the rotor shaft, and ensuring the rigidity is extremely important for maintaining the soundness and function of the rotating electrical machine.

  Then, an object of this invention is to ensure high rigidity about a rotary electric machine.

In order to achieve the above-mentioned object, the present invention provides a rotor having a rotor shaft that extends in the direction of the rotation axis and is rotatably supported, and a rotor core that is provided radially outside the rotor shaft; A stator having a cylindrical stator core provided on the outer side in the radial direction of the rotor core, a stator winding passing through the stator core in the direction of the rotation axis, and the rotor core and the fixed A frame that houses the rotor, two bearings that are arranged with the rotor core in the direction of the rotation axis so as to rotatably support the rotor shaft, and each of the two bearings is fixedly supported. Bearing brackets connected to both sides in the direction of the rotation axis, and a plurality of section steels coupled to each other in a lattice shape, and a plurality of the shape steels formed by joining the plurality of shape steels to each other in a lattice shape The frame A plurality of outer plates for closing the opening, in that it has features.

  According to the present invention, high rigidity can be secured for a rotating electrical machine.

It is a longitudinal cross-sectional view which shows the structure of the fully enclosed rotary electric machine which concerns on embodiment. It is a perspective view which shows the intensity | strength member of the flame | frame of the fully enclosed rotary electric machine which concerns on embodiment. It is a perspective view which shows the coupling | bond part of the beam member and column member of the flame | frame of the fully enclosed rotary electric machine which concerns on embodiment. It is a side view which shows the example of the groove shape before welding with the beam member and column member of the flame | frame of the fully enclosed rotary electric machine which concerns on embodiment. It is a side view which shows the example of the state after the welding of the beam member and column member of the frame of the fully enclosed rotary electric machine which concerns on embodiment. It is a perspective view which shows the modification of the coupling | bond part of the beam member and column member of the flame | frame of the fully enclosed rotary electric machine which concerns on embodiment. It is a front view which shows the attachment state of the outer side board to the flame | frame of the fully enclosed rotary electric machine which concerns on embodiment. It is a partial front view which shows the detail of attachment of the outer side board to the flame | frame of the fully-closed rotary electric machine which concerns on embodiment. It is a front view which shows the attachment state of the outer side board by the modification to the flame | frame of the fully enclosed rotary electric machine which concerns on embodiment.

  Hereinafter, a fully-closed rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

  FIG. 1 is a longitudinal sectional view showing a configuration of a fully-closed rotating electrical machine according to the embodiment. The fully closed rotating electrical machine 100 includes a rotor 10, a stator 20, two bearings 30, a frame 40, and a cooler 51.

  The rotor 10 includes a rotor shaft 11 that extends horizontally in the direction of the rotation axis and is rotatably supported by two bearings 30, and a rotor core 12 that is provided on the radially outer side of the rotor shaft 11.

  The stator 20 penetrates the cylindrical stator core 21 disposed on the radially outer side of the rotor core 12 and the radially inner side of the stator core 21 in the circumferential direction at intervals in the circumferential direction. A stator winding 22 is provided.

  The frame 40 is disposed on the radially outer side of the rotor core 12 and the stator 20. Both ends in the axial direction of the frame 40 are open, and a bearing bracket 45 is attached to each. Each bearing bracket 45 fixedly supports the bearing 30.

  A cooler cover 52 is attached above the frame 40. The cooler cover 52 houses the cooler 51. The cooler 51 cools a cooling gas (for example, air) that removes heat generated from the rotor 10 and the stator 20 by a cooling medium such as cooling water or outside air.

  The frame 40, the two bearing brackets 45, and the cooler cover 52 are coupled together to form a sealed space 70. A cooling gas is accommodated in the sealed space 70.

  FIG. 2 is a perspective view showing a strength member of the frame of the fully-closed rotating electrical machine according to the embodiment. As shown in FIG. 2, the frame 40 includes a plurality of beam members 41 and a plurality of column members 42 as strength members. Column members 42 are attached in parallel to each other in the vertical direction between the beam members 41 that are horizontally arranged adjacent to each other.

  The bearing bracket 45 having the bearing bracket opening 45a formed at the center is coupled to all the beam members 41. The connection between the beam member 41 and the column member 42 and the connection between the beam member 41 and the bearing bracket 45 are performed by welding.

  A plurality of beam members 41 and a plurality of column members 42 are combined to form a lattice structure. A frame opening 49 is formed in each lattice.

  FIG. 3 is a perspective view showing a coupling portion between the beam member and the column member of the frame of the fully-closed rotating electrical machine according to the embodiment. Shaped steel is used for the beam member 41 and the column member 42, respectively. Here, the shape steel refers to a steel material that is formed in advance in a certain cross-sectional shape and extends in the material axis direction. In FIG. 3, the case where the cross-sectional shape is H-shape steel as a shape steel is shown.

  The beam member 41 includes two flanges 41a that extend in parallel with each other in the longitudinal direction and face each other, and a web 41b that connects between the two flanges 41a that face each other. The beam member 42 includes two flanges 42a that extend in parallel to each other in the longitudinal direction and face each other, and a web 42b that connects between the two flanges 42a that face each other.

  The distance between the outer surfaces of the flanges 41a facing each other of the beam member 41 is referred to as a height H1 of the beam member 41. Further, the interval between the outer surfaces of the flanges 42a facing each other of the column member 42 is referred to as a height H2 of the column member 42. Each shape steel is formed or selected so that the height H1 of the beam member 41 and the height H2 of the column member 42 are equal.

  The beam member 41 and the column member 42 are arranged so that the outer surfaces thereof are the same plane, and the longitudinal direction of the column member 42 is perpendicular to the longitudinal direction of the beam member 42. As a result, the surface where the beam member 41 and the column member 42 face each other becomes the joint surface 43.

  FIG. 4 is a side view showing an example of a groove shape before welding between the beam member and the column member of the frame of the fully closed rotary electric machine according to the embodiment. The side surface of the flange 41a of the beam member 41 is the joint surface 43a, and the end surface in the longitudinal direction of the flange 42a of the column member 42 is the joint surface 43b. A groove 42c is formed on one side of the joint surface 43b. The groove 42c is formed on the joint surface 43b of the flange 42a on the side corresponding to the outside of the frame 40 of the two flanges 42a.

  FIG. 5 is a side view showing an example of a state after welding of the beam member and the column member of the frame of the fully closed rotary electric machine according to the embodiment. A welded portion 44 is formed between the groove 42 c and the joint surface 43 a of the beam member 41.

  4 and 5 show the case of fillet welding, the present invention is not limited to this. For example, a groove may be formed also on the joint surface 43 a side of the beam member 41. Also, a welded portion may be provided inside the frame 40.

  FIG. 6 is a perspective view showing a modified example of the joint portion between the beam member and the column member. The beam member 41 and the column member 42 are coupled via a connection plate 61. The connection plate 61 is coupled to each of the beam member 41 and the column member 42 by a plurality of bolts 62.

  In the case where the rigidity including the coupling portion can be sufficiently secured even by the coupling by the bolt 62, a coupling structure such as this modification may be used.

  FIG. 7 is a front view illustrating a state in which the outer plate is attached to the frame of the fully-closed rotating electrical machine according to the embodiment. FIG. 8 is a partial front view showing details of attachment of the outer plate to the frame of the fully closed rotating electrical machine according to the embodiment.

  Each frame opening 49 is closed by the outer plate 46. The outer plate 46 is coupled to the beam member 41 by fixing bolts 47 at four corners. In order to improve the air density, a packing (not shown) may be provided between the beam member 41 and the column member 42 and the outer plate 46. Further, the fixing bolt 47 may be fixed toward the column member 42. A terminal box 48 is provided on the outer surface of a part of the outer plate 46.

  FIG. 9 is a front view showing an attached state of the outer plate according to the modification. The outer plate 46 a on which the terminal box 48 is provided is provided for one frame opening 49. The other frame openings 49 are provided with an outer plate 46b that collectively covers the plurality of frame openings 49. Although not shown, for example, an outer plate that covers two frame openings 49 adjacent to each other in the vertical direction may be provided. In this way, it is possible to make the outer plate common for the frames of a plurality of types of rotating electrical machines.

  In the present embodiment as described above, the position where the terminal box 48 is provided is not particularly limited due to the configuration of the frame 40. Therefore, the position of the terminal box 48 can be selected based on the wiring in the frame 40 of the fully-closed rotating electrical machine 100 and the external wiring. Further, the position of the terminal box 48 affects the position of the center of gravity of the fully closed rotating electrical machine 100. For this reason, by changing the position of the terminal box 48, the position of the center of gravity can be changed to a desired position.

  Moreover, wiring can be performed inside the H-shaped steel, and options for the wiring support method in the frame 40 increase.

  As described above, the fully-closed rotating electrical machine 100 according to the present embodiment has the frame 40 having high rigidity and can improve the tolerance for the position selection of the terminal box 48.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention. That is, the present invention can be applied to the following cases.

  In the embodiment, the horizontal type is shown, but the present invention is not limited to this. That is, it may be a vertical type.

  In the embodiment, the case of a fully-closed rotary electric machine has been described as an example, but the present invention is not limited to this. For example, when the outer plate is not provided, that is, for a rotating electrical machine that is not fully closed, the effect of securing rigidity by the shape steel can be obtained.

  In the embodiment, the case of an H-shaped steel is shown by way of example, but the present invention is not limited to this. For example, box steel may be used as the shape steel. Alternatively, a channel material may be used as the shape steel as long as necessary rigidity is ensured.

  Moreover, although the case where an outer side board was attached with a volt | bolt was shown in embodiment, it is not limited to this. That is, for example, it may be a case of attachment by whole or partial welding.

  Furthermore, the embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention.

  The embodiments and the modifications thereof are included in the scope of the invention and the scope of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 20 ... Stator, 21 ... Stator core, 22 ... Stator winding, 30 ... Bearing, 40 ... Frame, 41 ... Beam member, 41a ... Flange , 41b ... web, 42 ... pillar member, 42a ... flange, 42b ... web, 42c ... groove, 43, 43a, 43b ... joint surface, 44 ... welded part, 45 ... bearing bracket, 45a ... bearing bracket opening, 46, 46a, 46b ... outer plate, 47 ... fixing bolt, 48 ... terminal box, 49 ... frame opening, 51 ... cooler, 52 ... cooler cover, 61 ... connection plate, 62 ... bolt, 70 ... sealed space, 100 ... all Closed rotary electric machine

Claims (6)

A rotor having a rotor shaft that extends in the direction of the rotation axis and is rotatably supported, and a rotor core provided on a radially outer side of the rotor shaft;
A stator having a cylindrical stator core provided radially outside the rotor core, and a stator winding penetrating the stator core in the direction of the rotation axis;
A frame for housing the rotor core and the stator;
Two bearings that are arranged across the rotor core in the direction of the rotation axis and rotatably support the rotor shaft;
A bearing bracket for fixing and supporting each of the two bearings and connecting to both sides of the frame in the rotational axis direction;
With
A plurality of section steels joined together in a grid ,
A plurality of outer plates for closing a plurality of frame openings formed by joining the plurality of shape steels to each other in a grid pattern;
A rotating electric machine comprising: A terminal box for connecting the internal wiring and external wiring in the frame of the frame;
The drawing position of the in-frame wiring to the terminal box can be selected from the plurality of frame openings.
The rotating electrical machine according to claim 1. The rotating electrical machine according to claim 1, wherein the plurality of shape steels have portions connected to each other by welding . The rotating electrical machine according to any one of claims 1 to 3, wherein the plurality of shape steels have portions coupled to each other by bolts . 5. The plurality of sections are used as a plurality of beam members extending in the horizontal direction and a plurality of column members extending in the vertical direction, respectively. Rotating electric machine. The rotating electrical machine according to any one of claims 1 to 5, wherein the section steel is an H- section steel .

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