JP5062441B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotary electric machine such as a generator, and more particularly to a rotary electric machine configured such that a stator and a bearing are individually installed on a base frame.

  A rotating electrical machine such as a DC machine, a synchronous machine, or an induction machine is composed of a stator and a rotor, and in terms of function, uses the principle of electromagnetic induction to perform mutual conversion between electrical energy and mechanical energy (rotational energy). The rotor must be rotated precisely positioned at the center of the stator.

  In order to accurately position the bearing and the stator that support the rotor, there is a rotating electrical machine having a configuration in which components of the rotating electrical machine are installed on a common base called a base frame. In the case of a rotating electric machine having this configuration, a bearing seat and an iron core pressing plate are individually installed on a common base so as to position the bearing and the stator (for example, see Patent Document 1).

  In addition to the configuration of Patent Document 1, the stator is housed in a box-shaped or cylindrical housing that has sufficient rigidity to support the weight of the stator and the rotor. There is a bearing bracket type rotating electrical machine configured to install a bearing on the body, but the description thereof is omitted because it is not a subject of the present invention.

Hereinafter, the configuration diagram of the rotating electrical machine described in Patent Document 1 will be described with reference to FIG.
FIG. 5 shows an example of a synchronous machine among rotating electrical machines. Reference numeral 1 denotes a stator iron core, in which electromagnetic steel plates punched in an annular shape are laminated to a predetermined thickness, and both end portions thereof are sandwiched between core holding plates 2 formed of thick plates, and long bolts 3 are tightened with nuts. The electromagnetic steel plates are configured to hold a shape by applying a compressive force. In addition, the stator core 1 is provided with ventilation ducts 4 at appropriate intervals in the laminating direction of the electromagnetic steel plates to provide a passage for cooling air in the radial direction, and the inner peripheral portion along the circumferential direction. The stator winding 5 is wound around the provided slot. In this way, the stator 6 is constituted by the stator core 1, the iron core pressing plate 2, and the stator winding 5.

  The core presser plates 2 provided at both ends of the stator core 1 described above are integrally provided with mounting legs 7 projecting from the left and right lower parts, and are fixed to the lower surface of the mounting legs 7. It is installed on a stator seat 10 provided on the upper surface of a base frame (also called a base floor or base) 9 via a mounting seat 8 and fixed with bolts and nuts.

On the other hand, a salient pole type magnetic pole 13 around which a rotor winding 12 is wound is attached to a rotary shaft 11 by a yoke to constitute a rotor 14.
Both ends of the rotary shaft 11 are rotatably supported by bearings 15 filled with lubricating oil. The bearings 15 are mounted on a bearing seat 15 a provided on the upper surface of the base frame 9 by a prismatic bearing base 16. And is fixed with bolts and nuts.

  The rotating electric machine configured as described above forms a rotating magnetic field by passing a current through the rotor winding 12, and the stator winding 5 by electromagnetic induction caused by the rotating magnetic field interlinking with the stator winding 5. By generating a voltage, the generator converts the rotational force into electric power.

  Further, when a power source is applied to the stator 6 from the outside, a rotating magnetic field is generated in the stator 6, and when rotating by an electromagnetic action with the rotating magnetic field generated in the rotor 14, an electric motor that supplies rotational energy to the outside is obtained. When the rotating electrical machine is used as a generator, a driving source such as an engine, a turbine, or a water turbine is connected to the rotating shaft 11, and when the rotating electrical machine is a driving source as an electric motor, the rotating shaft 11 is connected to the rotating shaft 11. Driven devices such as a pump, a compressor, and a blower are connected.

  Further, radial blades 17 are attached at positions adjacent to the magnetic poles 13 at both ends of the rotor 14, and cooling air is blown into the stator 6 by the rotation of the blades 17 so that the rotor windings 12 and The stator winding 5 and other components of the rotating electrical machine are cooled. The cooling air blown into the stator 6 passes through the ventilation duct 4 and is discharged radially outward of the stator 6. In addition, although the axial flow type blade | wing 17 is employ | adopted in FIG. 5, as long as cooling air can be ventilated, you may employ | adopt arbitrary types of blades, such as a centrifugal type.

  In the rotating electrical machine having the configuration shown in FIG. 5 described above, the stator 6 and the bearing 15 can be configured as a rotating electrical machine if they are placed on the stator seat 10 and the bearing seat 15a provided on the upper surface of the base frame 9. 6 and the installation work of the rotor 14 and the work which makes an axial center agree | coincide are easy.

Further, as in Patent Document 2, it is possible to move the stator 6 in parallel on the base frame 9 so that maintenance inspection can be easily performed. Since it is configured to support the weight of the child 14, a housing that covers elements constituting the rotating electrical machine such as the stator 6, the rotor 14, and the bearing 15 installed on the base frame 9, as in Patent Document 3. When the housing is provided, the housing itself is not required to have rigidity and strength as a rotating electric machine, so that the installation thereof is easy, and the inspection work can be facilitated by providing a working hole.
Furthermore, as in Patent Document 4, it is possible to provide a housing as a soundproof cover on the base frame 9 to reduce noise.

  Thus, in the rotating electrical machine configured to individually install the stator 6 and the bearing 15 on the base frame 9, the base frame 9 is easy to work on the base frame 9 due to its structural characteristics. 9 has various advantages such as being easy to provide a structure such as a housing and a soundproof cover.

JP2007-143301, Actual application Sho 55-174269, Actual application No. 55-141692, Jikosho 40-002918,

However, when the rotating electrical machine having the configuration shown in FIG. 5 is operated, displacement or vibration may occur in the stator 6 and the rotor 14.
6 and 7 show views of the rotary electric machine shown in FIG. 5 as seen from the axial direction and the side surface, respectively. However, in order to clarify the problem, the stator winding 5 of the stator 6 and the magnetic pole 13 of the rotor 14 are omitted and simplified, but the same configuration as that of FIG.

  As shown in FIGS. 6 and 7, in the configuration in which the stator 6 is installed on the upper surface of the base frame 9, the height h from the upper surface of the base frame 9 to the axial centerline 0-0 of the stator 6 and the rotor 14 is The outer peripheral radius r of the stator 6 is slightly higher (h> r). That is, the distance h from the upper surface of the base frame 9 to the axial center line 0-0 that is the center of gravity of the stator 6 is larger than the outer peripheral radius r of the stator 6 and is in a positional relationship.

  Further, the bearing 15 needs to be at a high position in order to align the axial center 0-0 of the rotor 14 with the axial center 0-0 of the stator 6, so that the bearing stand 16 supporting the bearing 15 is in the height direction. The distance h from the upper surface of the base frame 9 to the axial center of the rotor 14 is larger than the outer peripheral radius r of the stator 6. In the examples of FIGS. 6 and 7, the distance from the stator seat 10 is fixed. It is separated by the same distance h to the center of the child 6.

  When the rotating electric machine configured as described above is operated, the magnetic force generated by the rotor 14 generates a force that attracts the stator 6 and the rotor 14 to each other. Moreover, the force which rocks the bearing 15 by the imbalance of the weight of the rotor 14 generate | occur | produces. FIG. 8 shows the state of the rotating electrical machine when such a force is applied.

  FIG. 8 shows a state where the rotating electrical machine shown in FIG. 6 is operated, and is simplified similarly to FIG. The rotor 14 and the stator 6 are attracted by the magnetic field generated by the magnetic pole 12 of the rotor 13. For example, the rotor 14 receives the suction force F in the left direction, and the stator 6 receives the suction force F in the right direction. In FIG. 8, the point of action of the suction force F is represented by the center of the rotor and the stator, respectively.

  As shown in FIG. 8, when the suction force F acts, the bearing stand 16 and the iron core pressing plate 2 are deformed and displaced. In FIG. 8, the displacement amount of the shaft center of the rotor 14 due to the deformation of the bearing base 16 is represented by x, and the displacement amount of the shaft center of the stator 6 due to the deformation of the iron core pressing plate 2 is represented by y. However, FIG. 8 exaggerates the displacement actually generated for the sake of explanation.

  In the unlikely event that the rotor 13 is unbalanced in weight, the center of gravity of the rotor 14 and the center of the rotary shaft 11 that is the actual center of rotation do not coincide with each other. A force that swings 15 is generated, causing a displacement similar to the magnetic field attractive force F.

  In this case, the force due to the unbalanced weight is the point of action at the center of the rotating shaft 11, and the direction of the force is from the center of the rotating shaft 11 to the center of gravity, and the direction of the force is in accordance with the rotation of the rotating shaft 11. It will rotate. When the bearing stand 16 is displaced by the force due to the unbalanced weight and the axis of the rotor 14 is displaced, the stator 6 and the rotor 14 in the displaced direction approach each other. By reducing the distance between the two, the attractive force F by the magnetic field between the two becomes stronger, so that the displacement of the bearing seat and the iron core holding plate 2 may be further increased.

  Such displacement or vibration varies greatly depending on the support rigidity of the stator 6 and the rotor 14. In the conventional rotating electrical machine, the position of the center of gravity of the stator 6 and the bearing 15 and the bearing stand 16 are located farther upward than the outer peripheral radius r of the stator 6 from the upper surface of the base frame 9 that is the fixing portion. The supporting rigidity is weak, and this displacement causes the bearing base 16 to be deformed, and stress is generated at the base portion thereof. Further, the displacement of the rotating shaft 11 is also transmitted to the stator 6 by the attractive force due to the magnetic field between the rotor 14 and the stator 6, and as a result, stress is generated in the leg portion 7 of the iron core pressing plate 2. Therefore, the displacement due to the attractive force of the magnetic field or the vibration causes excessive stress to the constituent elements of the rotating electrical machine, which may cause a problem in the durability of the rotating electrical machine. Or, there is a case where the rotating electrical machine becomes large and heavy in order to provide a margin for the allowable stress.

Next, consider the case where the rotating electrical machine receives external force.
The state which looked at the driving | running state of the conventional rotary electric machine from the side is shown in FIG. A rotating electrical machine is used as a generator that is given a rotational force by a drive source, or is used as an electric motor to give a rotational force to a driven device. to be influenced. In FIG. 9, it is assumed that a driving source or a driven device is connected to the left end of the rotating shaft 11.

  The driving source may be a rotating machine such as a diesel engine, a gas engine, a gas turbine, a water wheel, or a windmill, but may be any other one that transmits rotational force. The driven device may be a rotary machine such as a pump, a compressor, or a blower, but may be any other device that receives a rotational force and performs a predetermined work.

  Some of these rotating machines generate an axial force F that is pushed or pulled in the axial direction with respect to the rotating shaft 11. By rotating the rotating shaft 11 in the axial direction by the axial force F, the bearing 15 is displaced in the axial direction as shown in FIG. This displacement is expressed as z.

  Even in this case, in the rotating electrical machine shown in FIG. 5, the position of the center of gravity of the stator 6 and the bearing 15 and the bearing base 16 are separated above the outer peripheral radius r of the stator 6 from the base frame 9 as the fixing portion. However, since the support rigidity is weak, the bearing base 16 is deformed by this displacement, and stress is generated at the base portion of the bearing base 16. Further, the displacement of the rotating shaft 11 is also transmitted to the stator 6 by the attractive force due to the magnetic field between the rotor 14 and the stator 6, and as a result, stress is generated in the leg portion 7 of the iron core pressing plate 2. Accordingly, the stator 6 and the rotor 14 are also displaced by the axial force F received from the rotating machine. Excessive stress is generated in the components of the rotating electrical machine, which may cause problems with the durability of the rotating electrical machine. Or, there is a case where the rotating electrical machine becomes large and heavy in order to provide a margin for the allowable stress.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine that improves the support rigidity of a stator and a bearing and has little displacement.

In order to achieve the above object, the invention according to claim 1 is directed to a stator including an annular stator core and a stator winding wound around an inner peripheral surface of the stator core, and the fixing A rotor disposed in the rotor and rotatable relative to the stator, a bearing supporting the rotor, a stator installation plate and a bearing seat for installing the stator via the stator seat Te rotary electric machine odor consisting a base frame having a bearing mounting plate for mounting the bearing through the base frame, while being arranged so as to face each other at both ends are formed in substantially C-shape A pair of stator installation plates provided with the stator seat, a base plate, a vertical plate that joins between the stator installation plate and the base plate, and disposed between opposite ends of the pair of stator installation plates And a predetermined dimension from the upper surface of the stator installation plate. An inner space portion of a frame formed by a pair of bearing installation plates installed at a low position and provided with the bearing seat, and the pair of stator installation plates, a base plate, and a pair of bearing installation plates is disposed on the stator. A pair of sides that form a shape that can accommodate a part of the lower half and that cover the inner space portion from below, and join between the stator installation plate and the base plate, and between the bearing installation plate and the cover It is comprised from the faceplate and the partition plate which obstruct | occludes the recessed part formed with the both ends of the said stator installation board and the bearing installation board from the said internal space part .

  According to the present invention, the distance from the base frame to the center of gravity of the stator and the distance from the base frame to the bearing are shortened to improve the support rigidity. Therefore, it is possible to provide a rotating electrical machine with less displacement and vibration. it can.

The perspective view which shows the installation state of the rotary electric machine in embodiment of this invention. The perspective view which shows the base frame of the rotary electric machine in embodiment of this invention. The simplified view which looked at the rotary electric machine in embodiment of this invention from the rotating shaft direction. The simplified view which looked at the rotary electric machine in the embodiment of the present invention from the front. The perspective view which shows the installation state of the conventional rotary electric machine. The simplified view which looked at the conventional rotary electric machine from the rotating shaft direction. The simplified view which looked at the conventional rotary electric machine from the front. The simplified view which looked at the conventional rotary electric machine in driving | operation from the rotating shaft direction. The simplified view which looked at the conventional rotary electric machine under operation from the front.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. In addition, the same code | symbol is attached | subjected to the same part as the conventional rotary electric machine shown in FIG. 5 thru | or 9, and the overlapping description is abbreviate | omitted suitably.

  As is well known, a rotating electrical machine is composed of a stator and a rotor. When rotating energy is applied from the outside and the rotor side is excited with direct current, the magnetic force generates electric power synchronized with the rotor on the stator side. It becomes a synchronous generator. On the other hand, when power is supplied to the stator from the outside, the stator coil generates a rotating magnetic field by the power. If the rotor is rotated by electromagnetic action with the rotating magnetic field generated by the rotor, it becomes an electric motor that supplies rotational energy to the outside. As described above, as a rotating electrical machine using an electromagnetic action generated between a stator and a rotor, an induction motor, an induction generator, a DC motor, a DC generator, a synchronous motor, a synchronous generator, a synchronous phase adjuster, etc. There is.

FIG. 1 is a diagram showing an embodiment of the present invention, and is particularly a perspective view of a synchronous generator or a synchronous motor. FIG. 2 is a perspective view showing a base frame (also called a base or base) of the rotating electrical machine.
As shown in FIGS. 1 and 2, the foundation frame 18 according to the present embodiment is composed of parts 18 a to 18 i described below.

  That is, a pair of stator installation plates 18a formed in a substantially U shape so as to sandwich the stator 19 of the rotating electrical machine from both sides, and a foundation (not shown) so as to be positioned directly below the pair of stator installation plates 18a. A pair of base plates 18b arranged to face each other, a vertical plate 18c that joins the stator installation plate 18a and the base plate 18b, and a stator installation plate 18a, a base plate 18b, and a vertical plate 18c. It is arranged between a plurality of reinforcing plates 18d that join each other and the opposite ends 18a1 of the pair of stator installation plates 18a, and is installed so as to have a height that is lower than the upper surface of the stator installation plate 18a by a dimension G. The bottom of the inner space portion 18f of the frame formed by the bearing installation plate 18e, the pair of stator installation plates 18a, the pair of base plates 18b, and the pair of bearing installation plates 18e is the shape of the bottom of the ship. The cover 18g having a ship bottom shape that covers the ship bottom-like internal space from below is joined to the stator installation plate 18a and the base plate 18b, and the bearing installation plate 18e and the cover 18g are joined to each other. A pair of side plates 18h formed in a substantially U shape, and a partition plate 18i that closes a recess formed by the bearing installation plate 18e between both end portions 18a1 and the bearing installation plate 18e of the stator installation plate 18a. It is configured.

  In the above description, it has been described that the lower portion of the internal space portion 18f has the shape of the bottom of the ship and the cover has the shape of the bottom of the boat. In short, the internal space portion 18f accommodates a part of the lower half of the stator 19. Any shape can be used as long as it is a cover that covers a part of the lower half of the stator 19 housed in the internal space 18f from below, and the shape shown in FIGS. .

The parts of the stator installation plate 18a, the base plate 18b, the vertical plate 18c, the reinforcing plate 18d, the bearing installation plate 18e, the cover 18g, the side plate 18h, and the partition plate 18i that are in contact with each other are firmly joined by welding or the like. Thus, the rigidity of the entire base frame 18 is increased.
In the above description, the base plate 18b and the bearing installation plate 18e are configured as separate plates. However, if possible, the base plate 18b and the bearing installation plate 18e may be configured as a single plate.

  Two stator seats 10 are provided in the middle portion of the pair of stator installation plates 18a of the base frame 18 thus configured, and the iron cores at both ends of the stator 19 are provided with respect to the stator seat 10. A mounting seat 22 fixed on the lower surface of the leg portion 21 provided in a shape projecting from the pressing plate 20 is placed, and the stator seat 10 and the mounting seat 22 are fixed with bolts and nuts.

  As described above, the position of the bearing installation plate 18e is lower by the dimension G than the stator installation plate 18a, and two of each of the pair of bearing installation plates 18e are lower by the height dimension G. The installation of the rotating electrical machine is completed by providing the bearing seats 23 one by one, placing the bearings 15 on the bearing seats 23 and fixing them with bolts and nuts. In this installation completed state, a part of the lower half of the stator 19 is accommodated in the space 18 f of the base frame 18.

Next, a description will be given with reference to FIGS.
3 and 4 are views of FIG. 1 as viewed from the direction of the rotation axis and from the front, respectively, but in order to clarify the feature points of the present embodiment, the stator winding 5 and the rotor 13 of the stator 19 are clearly shown. The magnetic pole 12 and the like are omitted, and the whole is simplified.

  As shown in FIGS. 3 and 4, the vertical distance H from the stator installation plate 18a of the base frame 18 to the center 0-0 of the stator 19 is smaller than the outer peripheral radius r of the stator 19 (H <r In particular, as indicated by a broken line, a part of the stator 19 is positioned below the stator installation plate 18a of the base frame 18 by a dimension G. Therefore, the center 0-0 of the stator 19 is closer to the stator installation plate 18a of the base frame 18 than FIG. 6 showing the dimensional relationship of the conventional rotating electrical machine.

Next, the support rigidity of the stator 19 when the suction force F acts in the horizontal direction between the stator 19 and the rotor 13 in FIG. 3 will be considered.
When the vertical distance from the center 0-0 of the stator 19 to the stator installation plate 18a of the base frame 18 is H, an F × H rotational moment is generated in the stator, and the stator 19 is caused by the moment. As a result, a stress is generated in the leg portion 21 of the iron core pressing plate 20. Therefore, if the suction force F is the same, the smaller the distance H, the smaller the momentum that tries to rotate the stator 19, so the smaller the distance H, the higher the supporting rigidity.

  Compared to the vertical distance h from the upper surface of the base frame 9 to the center 0-0 of the stator 6 or the rotor 14 in the conventional rotating electric machine shown in FIG. 6, the distance H can be reduced in the rotating electric machine according to the present embodiment. Since (H <h), the support rigidity becomes higher.

  In the present embodiment, the vertical distance from the center 0-0 of the rotating shaft 10 to the lower surface of the bearing seat 23 is I, and the rotational moment when the suction force F is generated is F × I. On the other hand, in the case of the conventional rotating electrical machine shown in FIG. 6, the rotational moment is F × h (F × I <F × h), and the supporting rigidity of the rotating electrical machine according to the present embodiment is higher.

  In the above description, the position of the bearing seat 23 is lowered by the dimension G, but this relationship is not essential, and the vertical distance from the center 0-0 of the stator 19 to the stator installation plate 18a of the base frame 18 If H is smaller than the outer peripheral radius r of the stator 19 (H <r), the same effect can be obtained.

  Therefore, when the magnetic force generated by the rotor 14 causes a force that attracts the stator 19 and the rotor 14 to each other or when a force that swings the bearing 15 due to an imbalance in the weight of the rotor 14 is generated. The displacement and vibration that cause the centers of the stator 19 and the rotating shaft 11 to shift are small, so that it is possible to reduce the occurrence of excessive force on the components of the rotating electrical machine as compared with the conventional rotating electrical machine.

  The stator core 1 is provided with ventilation ducts 4 for cooling at appropriate intervals. When the rotor 14 rotates in the same manner as in a conventional rotating electrical machine, the blade 17 blows air to fix the stator. The air is discharged through the ventilation duct 4 from the inside of the child 19 to the outside. Considering a state where the lower portion of the stator 19 is exposed without providing the cover 18g on the bottom surface of the base frame 18, the cooling air discharged from the ventilation duct 4 is diffused into the open space as it is. However, the installation state of the rotating electrical machine varies depending on the installation location, and it is impossible to predict the force in what state the open space below the stator 19 is at the design stage of the rotating electrical machine.

  In such a case, depending on the installation state of the rotating electrical machine, the ventilation resistance of the cooling air below the stator 19 changes greatly, and it is difficult to obtain the cooling air volume assumed at the time of design. By providing a cover 18g shaped like a ship bottom that covers the lower part of 19, the state of the lower part of the stator 19 does not change no matter where the rotating electrical machine is installed. Air volume can be used.

  Further, the bottom surface of the base frame 18 is configured like a ship bottom by the cover 18g, thereby improving the rigidity of the base frame 18 itself, and further, a stator installation plate 18a and a side plate 18h formed in a substantially U-shape. Since the space between the concave space portion with the bearing installation plate 18e and the space portion 18f inside the frame is closed by the vertical partition wall 18i and the joint portion is welded, the rigidity of the entire base frame 18 is increased. Thus, the displacement of the center of the stator 19 and the rotating shaft 11 can be further reduced. Furthermore, even when the lubricating oil leaks from the bearing 15, the lubricating oil leaked by the partition wall 18 i can be prevented from flowing to the stator 19 side, and the leaked lubricating oil adheres to the stator winding 5. Occurrence of defects such as insulation failure can be avoided.

  DESCRIPTION OF SYMBOLS 1 ... Stator iron core, 3 ... Long bolt, 4 ... Ventilation duct, 5 ... Stator winding, 10 ... Stator seat, 11 ... Rotating shaft, 12 ... Rotor winding, 13 ... Magnetic pole, 14 ... Rotor, DESCRIPTION OF SYMBOLS 15 ... Bearing, 17 ... Blade | wing, 18 ... Base frame, 18a ... Stator installation board, 18b base plate, 18c ... Vertical board, 18d ... Reinforcement board, 18e ... Bearing installation board, 18f ... Internal space part, 18g ... Cover, 18h ... side plate, 18i ... partition plate, 19 ... stator, 20 ... iron core pressing plate, 21 ... leg, 22 ... mounting seat, 23 ... bearing seat.

Claims (3)

A stator composed of an annular stator core and a stator winding wound around the inner peripheral surface of the stator core, and a rotation arranged in the stator and rotatable relative to the stator A base frame having a rotor, a bearing for supporting the rotor, a stator installation plate for installing the stator via a stator seat, and a bearing installation plate for installing the bearing via the bearing seat If, Te rotary electric machine odor consisting
The base frame is formed in a substantially U-shape and is arranged so that both ends thereof are opposed to each other, and a pair of stator installation plates provided with the stator seat, a base plate, the stator installation plate and the base A vertical plate that joins between the plates and the opposite ends of the pair of stator installation plates, and is installed at a position lower than the upper surface of the stator installation plate by a predetermined dimension and is provided with the bearing seat The inner space portion of the frame formed by the pair of bearing installation plates and the pair of stator installation plates, the base plate and the pair of bearing installation plates has a shape capable of storing a part of the lower half of the stator, A cover that covers the internal space portion from below, a pair of side plates that join between the bearing installation plate and the cover, and a gap between both ends of the stator installation plate. And recesses formed by bearing mounting plates Electric rotating machine, characterized by being configured from a partition plate for closing from the internal space portion.   2. The rotation according to claim 1, wherein the internal space formed by the base frame has a shape capable of storing a part of a lower half of the stator, and the internal space is covered with a cover from below. Electric.   The base frame is formed in a substantially U-shape and is arranged so that both ends thereof are opposed to each other, and a pair of stator installation plates provided with the stator seat, a base plate, the stator installation plate and the base A vertical plate that joins between the plates and the opposite ends of the pair of stator installation plates, and is installed at a position lower than the upper surface of the stator installation plate by a predetermined dimension and is provided with the bearing seat A pair of bearing installation plates, a cover that covers the inner space portion of the frame formed by the pair of stator installation plates, the base plate, and the pair of bearing installation plates from below, and between the stator installation plate and the base plate A pair of side plates that join between the bearing installation plate and the cover, and a partition plate that closes the recesses formed between the both ends of the stator installation plate and the bearing installation plate from the inner space portion side. With the features The rotating electrical machine according to claim 1 or claim 2 that.

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