JP2024007246A - Stator frame holding structure and holding method for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of restraining movement in a tangential direction (a circumferential direction) without restraining outward movement in a radial direction of a stator frame while reducing work and man-hours by special skill.

SOLUTION: A holding structure S1 includes: a stator frame 1 disposed radially outward of a stator core and provided with a frame-side engagement portion 1C formed of a hole or a groove; a stator base 2 on which the stator frame 1 is mounted and being provided with a base-side engagement unit 2A composed of a hole or a groove; and a key 3 including a first unit 3A inserted into the frame-side engagement portion 1C and a second unit 3B inserted into the base-side engagement unit 2A. The second unit 3B is fixed in a state of being inserted into the base-side engagement unit 2A. The first unit 3A is sandwiched by an inner surface of the frame-side engagement portion 1C via a filling material 4 in a circumferential direction while forming a clearance in a radial direction between a surface 3Ai of the first unit 3A facing inward in a radial direction and an inner surface of the frame-side engagement portion 1C.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

Embodiments of the present invention relate to a stator support structure and a holding method for a rotating electric machine.

A structure is known in which a large vertical shaft rotating electrical machine such as a water turbine generator is held on a concrete foundation via a stator frame. In such a structure, members such as a stator base, stator mounting bolts, and stator foundation bolts are usually provided between the stator frame and the foundation concrete. The stator frame is held on the foundation concrete by these members.

The stator base is fixed to the foundation concrete by stator foundation bolts. The stator mounting bolts are used to connect the stator frame mounted on the stator base to the stator base. Here, the stator mounting bolts are usually passed through the stator frame with some play in the stator frame.

When holding the stator frame as described above, it is generally desirable to adopt a structure that satisfies the following two specifications.
(1) A structure that prevents the stator frame from moving tangentially (circumferentially) with respect to the stator base due to magnetic torque acting on the stator during generator operation.
(2) A structure that does not inhibit thermal expansion of the stator frame outward in the radial direction during generator operation.

To achieve the above (1) and (2), a structure in which a radial knock pin and/or a torque key is provided between the stator base and the stator frame has been adopted in many cases.

In structures using radial knock pins, drilling using a special processing jig is required in order to attach the radial knock pins. This drilling process forms a hole extending horizontally between the stator frame and the stator base. Then, insert a radial knock pin into the hole formed. Specifically, the hole for inserting the radial dowel pin is formed between the bottom plate of the stator frame and the exposed part of the stator base from the foundation concrete that contacts this bottom plate, and is horizontal. extends in the direction. Machining such holes requires a large work load, for example, because the work space is restricted.

Here, the number of radial knock pins and corresponding holes tends to increase as the assumed magnetic torque increases. Therefore, depending on the magnetic torque, the number of holes to be drilled may be extremely large, and the work load for drilling the holes may be extremely heavy.

Further, since the hole is formed between the bottom plate portion of the stator frame and the exposed portion of the stator base as described above, there are restrictions on the size of the hole. As a result, the size of the radial knock pin is also restricted. Here, if a radial knock pin of sufficient size cannot be used, many radial knock pins may be used, but in this case as well, the work load of drilling may become very large.

On the other hand, in a structure using a torque key, position adjustment work of the torque key by hammering and welding work to fix the torque key are required. These tasks require skill and special equipment. This requires engineers with special skills and a large number of man-hours, which increases manufacturing costs.

Japanese Patent Application Publication No. 2006-6009

Therefore, the problem to be solved by the present invention is to restrain the outward movement of the stator frame in the radial direction while reducing the work and man-hours required by special skills when holding the stator frame on the stator base. It is an object of the present invention to provide a stator frame holding structure and a holding method for a rotating electric machine that can restrain movement in the circumferential direction (tangential direction) without causing any problems.

A stator frame holding structure for a rotating electric machine according to an embodiment includes a stator frame that is arranged radially outward of a stator core and that is provided with a frame-side engaging portion that is formed of a hole or a groove; a stator base on which a frame is placed and provided with a base-side engaging part consisting of a hole or groove; a first part inserted into the frame-side engaging part; and a second part inserted into the base-side engaging part. and a key containing the key. The second portion is inserted and fixed in the base-side engaging portion, and the first portion is connected to a surface of the first portion facing inward in the radial direction and a surface of the frame-side engaging portion. The first portion is sandwiched between the inner surface of the frame-side engaging portion via a filler in the circumferential direction of the stator core while forming the radial gap between the first portion and the inner surface, or The second portion is fixed while being inserted into the side engaging portion, and the second portion has a radial portion between the surface of the second portion facing outward in the radial direction and the inner surface of the base side engaging portion. While forming a gap, the stator core is sandwiched between the inner surface of the base-side engaging portion via a filler in the circumferential direction of the stator core.

A stator frame holding structure for a rotating electrical machine according to another embodiment includes a stator frame that is disposed radially outward of a stator core and is provided with a frame-side engaging portion consisting of a hole or a groove; The key includes a stator base on which a child frame is placed, a first part inserted into the frame-side engaging part, and a fixed part fixed to the stator base. The first portion forms the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion, and the first portion of the stator core. It is sandwiched between the inner surfaces of the frame-side engaging portions in the circumferential direction. A through hole penetrating in the radial direction is formed in the fixed portion, and a fastening hole extending in the radial direction from an outer circumferential surface of the stator base is formed. The fixed portion is fixed by a fastening member that passes through the through hole and is fastened to the fastening hole.

A stator frame holding structure for a rotating electrical machine according to another embodiment includes a stator frame that is disposed radially outward of a stator core and is provided with a frame-side engaging portion consisting of a hole or a groove; The stator base includes a stator base on which a child frame is placed, and a key including a first part inserted into the frame-side engaging part and a fixed part fixed to the stator base. The first portion forms the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion, and the first portion of the stator core. It is sandwiched between the inner surfaces of the frame-side engaging portions in the circumferential direction. The fixed portion is fixed to the stator base by a knock pin extending in the axial direction of the stator core.

A stator frame holding structure for a rotating electric machine according to another embodiment includes a frame side engagement portion that is arranged radially outward of a stator core and that is formed of a hole or groove that penetrates in the axial direction of the stator core. a stator frame on which the stator frame is mounted, a stator base on which the stator frame is placed, a presser plate that is inserted into the frame side engaging portion and placed on the stator base, and a presser plate that penetrates the presser plate. A knock pin inserted into the stator base is provided. The stator frame includes a rib that is part of or integrated with the stator frame and extends in the radial direction inside the frame-side engaging portion. The presser plate is arranged in the circumferential direction of the stator core while forming the radial gap between the surface of the presser plate facing inward in the radial direction and the inner surface of the frame-side engaging portion. The ribs are sandwiched between the ribs.

A stator frame holding structure for a rotating electrical machine according to another embodiment includes a stator frame that is disposed radially outward of a stator core and is provided with a frame-side engaging portion consisting of a hole or a groove; A stator base on which a child frame is placed and including a pair of vertical wall portions spaced apart in the circumferential direction of the stator core, a pair of bolts provided on mutually opposing surfaces of the pair of vertical wall portions, and engagement on the frame side. and a second portion inserted between the pair of bolts. The first portion forms the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion, and the first portion of the stator core. It is sandwiched between the inner surfaces of the frame-side engaging portions in the circumferential direction. The second portion is fixed to the stator base by being sandwiched between the pair of bolts.

Further, a method for holding a stator frame of a rotating electric machine according to an embodiment includes a stator frame disposed radially outward of a stator core and provided with a frame-side engaging portion consisting of a hole or a groove; a stator base on which a stator frame is placed and provided with a base-side engaging portion consisting of a hole or groove; a first portion inserted into the frame-side engaging portion; and a first portion inserted into the base-side engaging portion. providing a key including two parts; securing the stator base to a foundation; mounting the stator frame on the stator base; and attaching the key to the stator frame and the stator base; and a step of attaching. In the attaching step, the second portion is inserted into the base side engaging portion and fixed, and the first portion is connected to the surface of the first portion facing inward in the radial direction and the frame. While forming the radial gap with the inner surface of the side engaging portion, the stator core may be sandwiched between the inner surface of the frame side engaging portion via a filler in the circumferential direction of the stator core, or one part is inserted and fixed in the frame side engaging part, and the second part is between the surface of the second part facing outward in the radial direction and the inner surface of the base side engaging part. The stator core is sandwiched between the inner surface of the base-side engaging portion via a filler in the circumferential direction of the stator core while forming the radial gap therebetween.

A stator frame holding method for a rotating electric machine according to another embodiment includes a stator frame that is arranged radially outward of a stator core and is provided with a frame-side engaging portion consisting of a hole or groove; a step of preparing a stator base on which a child frame is placed; and a key including a first part to be inserted into the frame-side engaging part and a fixed part to be fixed to the stator base; and the stator base. and mounting the stator frame on the stator base; and attaching the key to the stator frame and the stator base. A through hole penetrating in the radial direction is formed in the fixed portion, and a fastening hole extending in the radial direction from an outer circumferential surface of the stator base is formed. In the attaching step, the first portion forms the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion; The fixed portion is sandwiched between the inner surface of the frame-side engaging portion in the circumferential direction of the stator core, and is fixed by a fastening member fastened to the fastening hole through the through hole.

A method for holding a stator frame of a rotating electrical machine according to another embodiment includes a stator frame that is arranged radially outward of a stator core and is provided with a frame-side engaging portion consisting of a hole or a groove; a step of preparing a stator base on which a child frame is placed; and a key including a first part to be inserted into the frame-side engaging part and a fixed part to be fixed to the stator base; and the stator base. and mounting the stator frame on the stator base; and attaching the key to the stator frame and the stator base. In the attaching step, the first portion forms the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion; The fixed portion is sandwiched between the inner surfaces of the frame-side engaging portions in the circumferential direction of the stator core, and is fixed to the stator base by knock pins extending in the axial direction of the stator core.

A stator frame holding method for a rotating electric machine according to another embodiment includes a frame-side engaging portion that is arranged radially outward of a stator core and that is formed of a hole or groove that penetrates the stator core in the axial direction. a stator frame on which the stator frame is mounted, a stator base on which the stator frame is placed, a presser plate that is inserted into the frame side engaging portion and placed on the stator base, and a presser plate that penetrates the presser plate. a step of preparing a knock pin to be inserted into the stator base; a step of fixing the stator base to a foundation; placing the stator frame on the stator base; and engaging the presser plate on the frame side. and a step of inserting the knock pin that passes through the presser plate into the stator base. The stator frame includes a rib that is part of or integrated with the stator frame and extends in the radial direction inside the frame-side engaging portion. The presser plate is arranged in the circumferential direction of the stator core while forming the radial gap between the surface of the presser plate facing inward in the radial direction and the inner surface of the frame-side engaging portion. It is fixed by the knock pin in a state where the rib is sandwiched between the ribs.

A stator frame holding method for a rotating electric machine according to another embodiment includes a stator frame that is arranged radially outward of a stator core and is provided with a frame-side engaging portion consisting of a hole or groove; A stator base, on which a child frame is placed, includes a pair of vertical wall portions spaced apart in the circumferential direction of the stator core, and a pair of bolts are provided on mutually opposing surfaces of the pair of vertical wall portions, and the frame side engagement a key including a first part to be inserted into the part and a second part to be inserted between the pair of bolts, fixing the stator base to a foundation, and fixing the stator base to the stator base; The method includes the steps of placing the key on a child frame, and attaching the key to the stator frame and the stator base. In the step of attaching the key, the first portion forms the radial gap between the surface of the first portion facing radially inward and the inner surface of the frame-side engaging portion. At the same time, the second portion is sandwiched between the inner surfaces of the frame-side engaging portions in the circumferential direction of the stator core, and the second portion is fixed to the stator base by being sandwiched between the pair of bolts.

According to the present invention, when holding the stator frame on the stator base, the work required by special skills and the number of man-hours are reduced, and the movement of the stator frame in the circumferential direction (tangential direction) is not restricted in the radial direction. movement in the direction) can be restricted.

FIG. 3 is a diagram showing a stator frame holding structure according to the first embodiment. FIG. 2 is a view seen in the direction of arrow A in FIG. 1; 3 is a sectional view taken along the arrow line BB in FIG. 2. FIG. It is a figure which shows the stator frame holding structure based on the modification of 1st Embodiment. 5 is a view seen in the direction of arrow C in FIG. 4. FIG. 6 is a sectional view taken along the arrow line DD in FIG. 5. FIG. FIG. 7 is a diagram showing a stator frame holding structure according to a second embodiment. 8 is a view seen in the direction of arrow E in FIG. 7. FIG. 8 is a view seen in the direction of arrow F in FIG. 7. FIG. FIG. 7 is a diagram showing a stator frame holding structure according to a third embodiment. 11 is a view seen in the direction of arrow G in FIG. 10. FIG. 12 is a view seen in the direction of arrow H in FIG. 11. FIG. FIG. 7 is a diagram illustrating an assembly procedure of a stator frame holding structure according to a third embodiment. It is a figure which shows the stator frame holding structure based on the modification of 3rd Embodiment. 15 is a diagram showing a state in which some members are removed from the stator frame holding structure shown in FIG. 14. FIG. It is a figure which shows the stator frame holding structure based on another modification of 3rd Embodiment. It is a figure which shows the stator frame holding structure based on 4th Embodiment. 18 is a view seen in the direction of arrow J in FIG. 17. FIG. FIG. 7 is a diagram showing a stator frame holding structure according to a fifth embodiment. 20 is a view seen in the direction of arrow K in FIG. 19. FIG. 20 is a view seen in the direction of arrow L in FIG. 19. FIG.

Each embodiment will be described below with reference to the accompanying drawings.

<First embodiment>
FIG. 1 is a diagram showing a stator frame holding structure S1 (hereinafter abbreviated as holding structure S1) for a rotating electrical machine according to a first embodiment, and in detail is a longitudinal cross-sectional view of the holding structure S1. FIG. 2 is a view taken in the direction of arrow A in FIG. FIG. 3 is a sectional view taken along the arrow line BB in FIG. The holding structure S1 shown in FIGS. 1 to 3 includes a stator frame 1, a stator base 2, and a key 3.

The holding structure S1 is a structure that holds the stator frame 1 on the foundation BS via the stator base 2. The stator frame 1 is arranged radially outward of the stator core SC. The stator frame 1 is then coupled to the stator core SC. When the stator core SC is coupled to the stator frame 1, the load of the stator core SC is supported by the foundation BS.

The key 3 is provided so as to straddle the stator frame 1 and the stator base 2. The key 3 is provided to restrict movement of the stator frame 1 with respect to the stator base 2. The stator base 2 is embedded and fixed in the foundation BC. Therefore, when the stator core SC is coupled to the stator core SC, movement of the stator core SC with respect to the stator base 2 and the foundation BS is restricted by the key 3.

The stator core SC has a cylindrical shape. Reference numeral C in FIG. 1 indicates the central axis of the stator core SC. A rotor (not shown) is arranged inside the stator core SC so that its rotation center coincides with the central axis C. Hereinafter, the direction extending on the central axis C or the direction parallel to the central axis C will be referred to as the axial direction of the stator core SC. Further, the direction perpendicular to the axial direction of the stator core SC is referred to as the radial direction of the stator core SC. Further, the direction of rotation around the central axis C is called the circumferential direction of the stator core SC.

In addition, when simply calling an axial direction, a radial direction, and a circumferential direction below, it refers to the axial direction of stator core SC, the radial direction of stator core SC, and the circumferential direction of stator core SC, respectively. Further, the stator frame 1 held by the holding structure S1 according to the present embodiment is a stator frame of a vertical shaft type rotating electric machine. In this case, the central axis C extends in the vertical direction.

The stator frame 1 includes a frame main body 1A and a flange portion 1B. The frame body 1A has a cylindrical shape. The stator frame 1 is arranged radially outward of the stator core SC. The frame body 1A covers the stator core SC and is coupled to the stator core SC. The frame body 1A is located coaxially with the stator core SC. In addition, in this embodiment, although the case where frame main body 1A is cylindrical is illustrated and demonstrated, the shape of frame main body 1A is not limited to cylindrical shape, For example, a polygonal cylindrical shape may be sufficient as it.

The flange portion 1B is connected to the lower end portion of the frame body 1A. The flange portion 1B extends radially outward from the frame body 1A. The flange portion 1B is a portion placed on the stator base 2. The flange portion 1B is in direct contact with the upper surface of the stator base 2. The stator frame 1 in this embodiment includes a plurality of flange portions 1B located at intervals in the circumferential direction. However, the stator frame 1 may include an annular flange portion 1B extending over the entire circumference in the circumferential direction.

A frame-side engaging portion 1C is provided on the flange portion 1B. In this embodiment, the frame-side engaging portion 1C is a hole penetrating in the axial direction. A portion of the key 3 is inserted into the frame-side engaging portion 1C.

Note that the frame side engaging portion 1C is not limited to a hole, but may be a groove. However, when the frame-side engaging portion 1C is constituted by a groove, it is preferable that the frame-side engaging portion 1C is formed by a groove recessed inward in the radial direction from the outer circumferential surface of the flange portion 1B. In this case, it is possible to prevent the key 3 from becoming larger or having a more complicated shape.

The stator base 2 is fixed to the foundation BS with at least its upper surface exposed from the foundation BS. The stator base 2 is embedded in the stator base 2 and fixed to the foundation BS by stator bolts (not shown).

In this embodiment, a plurality of stator bases 2 are arranged at intervals in the circumferential direction. Each of the stator bases 2 is provided with a base-side engaging portion 2A. In this embodiment, the base-side engaging portion 2A is formed of a groove recessed in the axial direction from the upper surface of the stator base 2. A portion of the key 3 is inserted into the base side engaging portion 2A.

In this embodiment, the stator frame 1 is placed on the stator base 2 so that the base side engaging part 2A and the frame side engaging part 1C overlap each other in the axial direction. The frame-side engaging portion 1C is larger than the base-side engaging portion 2A. When the base-side engaging portion 2A and the frame-side engaging portion 1C overlap each other in the axial direction, the entire base-side engaging portion 2A is exposed from the frame-side engaging portion 1C.

Note that the base-side engaging portion 2A is not limited to a groove, but may be a hole penetrating in the axial direction. Further, the base-side engaging portion 2A may be a groove recessed inward in the radial direction from the outer peripheral surface of the flange portion 1B, and may be formed as a groove that opens in the axial direction or does not open. However, from the viewpoint of preventing the key 3 from increasing in size and having a complicated shape, and from reducing the labor involved in manufacturing, it is preferable to form the base-side engaging portion 2A with a groove recessed in the axial direction.

The key 3 includes a first portion 3A inserted into the frame-side engaging portion 1C and a second portion 3B inserted into the base-side engaging portion 2A. In this embodiment, the key 3 is a so-called square key, and has a rectangular parallelepiped shape. The key 3 is inserted from the frame side engaging part 1C into the base side engaging part 2A with the base side engaging part 2A and the frame side engaging part 1C overlapping each other in the axial direction, and the key 3 is inserted into the base side engaging part 2A from the frame side engaging part 1C. and the base side engaging portion 2A.

Note that when the key 3 is in a state spanning the frame-side engaging portion 1C and the base-side engaging portion 2A as described above, the key 3 is located inside the frame-side engaging portion 1C. The portion corresponds to the first portion 3A, and the portion of the key 3 located inside the base side engaging portion 2A corresponds to the second portion 3B.

In this embodiment, the second portion 3B is inserted and fixed into the base-side engaging portion 2A. Specifically, the second portion 3B is inserted into the base side engaging portion 2A so that movement in the circumferential direction and the radial direction is restricted. As shown in FIG. 1, the second portion 3B is in contact with the inner surface of the base-side engaging portion 2A on the inside and outside in the radial direction. As shown in FIG. 3, the second portion 3B is in contact with the inner surface of the base-side engaging portion 2A in both circumferential directions. That is, the second portion 3B is sandwiched between the inner surfaces of the base-side engaging portion 2A in the circumferential direction.

Note that if there is play between the second portion 3B and the base-side engaging portion 2A that allows movement of the second portion 3B, this play is compensated for. Furthermore, in this embodiment, the base side engaging portion 2A is formed with a groove having a rectangular shape when viewed in the axial direction, corresponding to the shape of the rectangular parallelepiped key 3. However, if the key 3 is formed in a cylindrical shape, the base-side engaging portion 2A may be a circular groove or hole.

On the other hand, the first portion 3A forms a gap in the circumferential direction between at least the surface 3Ai of the first portion 3A facing inward in the radial direction and the inner surface of the frame side engaging portion 1C. It is sandwiched between the inner surface of the frame-side engaging portion 1C via the filler 4. That is, the first portion 3A is in contact with the inner surface of the frame-side engaging portion 1C via the filler 4 in both circumferential directions. Further, the surface 3Ai of the first portion 3A is one surface of the rectangular parallelepiped key 3. The entire surface A3i is separated from the inner surface of the opposing frame-side engaging portion 1C, and the entire surface 3Ai faces a gap located inwardly in the radial direction.

In this embodiment, a radial gap is also formed between the surface of the first portion 3A facing radially outward and the inner surface of the frame-side engaging portion 1C. However, a radial gap may not be formed between the surface of the first portion 3A facing radially outward and the inner surface of the frame-side engaging portion 1C.

The filler 4 is filled in a circumferential gap formed between the key 3 and the frame-side engaging portion 1C. The filler 4 is filled into the gap in the circumferential direction after the key 3 is inserted into the frame-side engaging portion 1C and the base-side engaging portion 2A. The filler 4 is preferably plastic or, if elastic, has a very high elastic modulus, such as metal. In this embodiment, the filler 4 is made of resin. Specifically, the filler 4 is a thermoplastic resin, and is hardened after being poured into the circumferential gap in a liquid state. Further, the filler 4 may be a thermosetting or photocurable resin, and in this case, it is poured into the circumferential gap in a liquid state and then cured by heating or light irradiation.

In FIG. 2, the circumferential direction is indicated by an arrow DC. In the state in which the filler 4 is filled as described above and the first portion 3A is sandwiched between the inner surfaces of the frame-side engaging portions 1C in the circumferential direction via the filler 4, the stator frame 1 movement in the circumferential direction DC with respect to the stator base 2 is restricted (restricted, prevented).

On the other hand, the filler 4 contacts the inner surface of the frame-side engaging portion 1C and the side surface of the key 3, but does not connect the inner surface of the frame-side engaging portion 1C and the side surface of the key 3. The frame-side engaging portion 1C is in slidable contact with the filler 4. Here, as described above, at least the surface 3Ai of the first portion 3A facing radially inward forms a radial gap with the inner surface of the frame-side engaging portion 1C. As a result, the holding structure S1 does not restrain the stator frame 1 from moving outward in the radial direction.

A lubricant may be provided between the filler 4 and the frame-side engaging portion 1C. The lubricant may be grease or a solid lubricant. When the lubricant is grease, it may be applied to the inner surface of the frame-side engaging portion 1C before filling with the filler 4, or it may be applied to the inner surface of the frame-side engaging portion 1C between the filler 4 and the inner surface of the frame-side engaging portion 1C after filling the filler 4. It may be applied toward the interface. Further, when the lubricant is a solid lubricant, the solid lubricant may be formed on the inner surface of the frame side engaging portion 1C before filling with the filler 4.

A method of holding the stator frame 1 using the holding structure S1 as described above will be explained.

First, a stator frame 1 in which a frame-side engaging portion 1C is provided in advance, and a stator base 2 in which a base-side engaging portion 2A is provided in advance are prepared. Then, the stator base 2 is fixed to the foundation BS. Then, the stator frame 1 is placed on the stator base 2 so that the base-side engaging portion 2A and the frame-side engaging portion 1C overlap each other in the axial direction.

Next, the key 3 is inserted from the frame side engaging part 1C to the base side engaging part 2A. Then, the second portion 3B of the key 3 is inserted and fixed in the base side engaging portion 2A. On the other hand, the first portion 3A of the key 3 forms a radial gap between at least the surface 3Ai of the first portion 3A facing radially inward and the inner surface of the frame-side engaging portion 1C. It is inserted into the frame side engaging part 1C with a circumferential gap being formed between it and the inner surface of the frame side engaging part 1C in the circumferential direction.

Thereafter, the filler 4 is filled into the circumferential gap formed between the key 3 and the frame-side engaging portion 1C. Then, a state is formed in which the key 3 is sandwiched between the inner surface of the frame-side engaging portion 1C via the filler 4.

In the holding structure S1 according to the first embodiment described above, movement of the stator frame 1 in the circumferential direction DC with respect to the stator base 2 is restricted (restricted, prevented) as shown in FIG. This can prevent the stator frame 1 from moving in the circumferential direction with respect to the stator base 2 due to magnetic torque acting on the stator during generator operation. Further, the frame-side engaging portion 1C is in slidable contact with the filler 4. As described above, a radial gap is formed at least between the surface 3Ai of the first portion 3A facing radially inward and the inner surface of the frame-side engaging portion 1C. Thereby, outward movement in the radial direction of the stator frame 1 is not restricted. Therefore, thermal expansion of the stator frame 1 radially outward during generator operation is not restricted. Such a holding structure S1 eliminates the need for horizontal drilling and welding for fixing the key to the stator base, etc., which occurred in conventional structures. Therefore, the work and man-hours required by special skills can be reduced.

Therefore, when holding the stator frame 1 on the stator base 2, it is possible to reduce the work and man-hours required by special skills and to move the stator frame 1 in the circumferential direction without restricting the outward movement in the radial direction. Can be restrained.

In the first embodiment described above, the first portion 3A of the key 3 is inserted into the frame side engaging portion 1C with a gap formed, and the second portion 3B of the key 3 is inserted into the base side engaging portion 2A. Fixed. However, these relationships may be reversed from the above embodiments, as shown in FIGS. 4-6. FIG. 4 shows a holding structure according to a modification of the first embodiment. FIG. 5 is a view taken in the direction of arrow C in FIG. FIG. 6 is a cross-sectional view taken along the arrow line DD in FIG.

That is, in the modified examples shown in FIGS. 4 to 6, the first portion 3A is inserted and fixed in the frame-side engaging portion 1C. The second portion 3B forms a radial gap between at least the surface of the second portion 3B facing outward in the radial direction and the inner surface of the base side engaging portion 2A, and the filler 4 in the circumferential direction. It is sandwiched between the inner surface of the base-side engaging portion 2A via. Note that the first embodiment and modifications described above are merely examples, and the first embodiment may be configured by other modifications.

<Second embodiment>
Hereinafter, a stator frame holding structure S2 (hereinafter abbreviated as holding structure S2) for a rotating electrical machine according to a second embodiment will be described using FIGS. 7 to 9. FIG. 7 is a longitudinal cross-sectional view of the holding structure S2. FIG. 8 is a view in the direction of arrow E in FIG. FIG. 9 is a view taken in the direction of arrow F in FIG. Among the components in this embodiment, the same components as in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the frame-side engaging portion 1C formed on the flange portion 1B of the stator frame 1 consists of a groove recessed in the axial direction from the upper surface of the flange portion 1B. Then, the frame-side engaging portion 1C opens outward in the radial direction.

The stator base 2 is fixed to the foundation BS so that the upper part thereof protrudes from the foundation BS. The upper surface, inner circumferential surface, upper portions of the outer circumferential surface, and upper portions of the side surfaces of the stator base 2 are exposed from the foundation BS. The inner circumferential surface is a surface facing inward in the radial direction, the outer circumferential surface is a surface facing outward in the radial direction, and the side surfaces are other than the upper and lower surfaces located between the inner circumferential surface and the outer circumferential surface. This is the aspect of

In this embodiment, the stator base 2 is not provided with the base side engaging portion 2A. On the other hand, the stator base 2 is provided with fastening holes 2B for bolts 5 as fastening members. The fastening hole 2B extends radially from the outer peripheral surface of the stator base 2.

The key 3 includes a first portion 3A inserted into the frame-side engaging portion 1C and a fixed portion 3C fixed to the stator base 2. A through hole 3D passing through in the radial direction is formed in the fixed portion 3C.

The first portion 3A forms a radial gap between the surface 3Ai of the first portion 3A facing inward in the radial direction and the inner surface of the frame-side engaging portion 1C, and the frame-side engaging portion in the circumferential direction. It is sandwiched between the inner surfaces of 1C. Specifically, the first portion 3A is in direct contact with the inner surface of the frame-side engaging portion 1C in both circumferential directions. The first portion 3A is slidably in contact with the inner surface of the frame-side engaging portion 1C. Note that the first portion 3A may be in contact with the inner surface of the frame-side engaging portion 1C via the filler 4 as in the first embodiment. Further, it is desirable to apply or form a lubricant between the first portion 3A and the frame side engaging portion 1C.

The fixed portion 3C is fixed by a bolt 5 fastened to the fastening hole 2B through the through hole 3D. In this embodiment, the through hole 3D is an elongated hole that is elongated in the circumferential direction. Then, two bolts 5 are passed through the through holes 3D and fastened to the fastening holes 2B, respectively. In this embodiment, the bolt 5 is passed through the through hole 3D with a circumferential gap formed between the bolt 5 and the through hole 3D. The circumferential gap between the bolt 5 and the through hole 3D is filled with a through hole filler 6. Specifically, the through-hole filler 6 is filled so that the bolt 5 does not move in the circumferential direction with respect to the through-hole 3D. As a result, movement of the key 3 relative to the stator base 2 is restricted.

The through-hole filling material 6 is made of the same material as the filling material 4 described in the first embodiment. The through hole filler 6 in this embodiment is made of resin. Specifically, the through-hole filling material 6 is a thermoplastic resin, and is hardened after being poured into the circumferential gap in a liquid state.

In the method for holding the stator frame 1 using the holding structure S2 as described above, first, the stator frame 1 in which the frame-side engaging portion 1C is provided in advance, and the stator base 2 in which the fastening hole 2B is provided in advance. be prepared. Then, the stator base 2 is fixed to the foundation BS. After the positions of the fastening hole 2B and the frame-side engaging portion 1C are adjusted, the key 3 is inserted into the frame-side engaging portion 1C, and the bolt 5 is passed through. Then, the bolt 5 is fastened to the fastening hole 2B. Thereafter, the through-hole filling material 6 is filled into the circumferential gap between the key 3 and the through-hole 3D. Then, the key 3 is fixed to the stator base 2.

Also in this embodiment, it is possible to prevent the stator frame 1 from moving in the circumferential direction with respect to the stator base 2 due to magnetic torque acting on the stator during generator operation. Furthermore, thermal expansion of the stator frame 1 radially outward during generator operation is not restricted. The holding structure S2 eliminates the need for horizontal drilling and welding for fixing the key to the stator base, etc., which occurred in conventional structures. Therefore, the work and man-hours required by special skills can be reduced.

<Third embodiment>
Hereinafter, a stator frame holding structure S3 (hereinafter abbreviated as holding structure S3) for a rotating electrical machine according to a third embodiment will be described using FIGS. 10 to 12. FIG. 10 is a longitudinal sectional view of the holding structure S3. FIG. 11 is a view taken in the direction of arrow G in FIG. FIG. 12 is a view taken in the direction of arrow H in FIG. 11. Among the components in this embodiment, the same components as those in the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the frame-side engaging portion 1C formed on the flange portion 1B of the stator frame 1 consists of a groove recessed in the axial direction from the upper surface of the flange portion 1B. Then, the frame-side engaging portion 1C opens outward in the radial direction.

The stator base 2 is provided with a groove 2C that is recessed in the axial direction from the upper surface of the stator base 2. The groove portion 2C is provided at a position further outward in the radial direction than the flange portion 1B. A key holding member 7 is fitted into the groove 2C. The key holding member 7 extends upward from the stator base 2. A key groove portion 7A is provided on the upper surface of the key holding member 7. The keyway portion 7A is open inward and outward in the radial direction.

As an example, the groove portion 2C extends parallel to a tangent at the circumferential center of a circle centered on the central axis C, which passes through the circumferential center of the outer peripheral surface of the stator base 2. Further, the key groove portion 7A extends parallel to the radial direction.

The key 3 includes a first portion 3A inserted into the frame-side engaging portion 1C and a fixed portion 3C fixed to the stator base 2. The first portion 3A forms a radial gap between the surface 3Ai of the first portion 3A facing inward in the radial direction and the inner surface of the frame-side engaging portion 1C, and the frame-side engaging portion in the circumferential direction. It is sandwiched between the inner surfaces of 1C. Specifically, the first portion 3A is in direct contact with the inner surface of the frame-side engaging portion 1C in both circumferential directions. The first portion 3A is slidably in contact with the inner surface of the frame-side engaging portion 1C. Note that the first portion 3A may be in contact with the inner surface of the frame-side engaging portion 1C via the filler 4 as in the first embodiment. Further, it is desirable to apply or form a lubricant between the first portion 3A and the frame side engaging portion 1C.

On the other hand, the fixed portion 3C of the key 3 is fixed to the stator base 2 by a knock pin 8 extending in the axial direction. Specifically, with the fixed portion 3C of the key 3 inserted into the key groove portion 7A on the upper surface of the key holding member 7, the knock pin 8 straddles the fixed portion 3C, the key holding member 7, and the stator base 2. Driven in a state. More specifically, the knock pin 8 penetrates the fixed portion 3C. Then, the knock pin 8 comes into contact with the key holding member 7 in a state where it is caught on the key holding member 7 in the circumferential direction. Then, the knock pin 8 is inserted into the stator base 2. In this embodiment, two knock pins 8 are provided, one knock pin 8 is caught in a recess formed in the radially inner surface of the key holding member 7, and the other knock pin 8 is caught in a recess formed in the radially inner surface of the key holding member 7. It is caught in a recess formed on the radially outer surface.

By driving the knock pin 8 in the above manner, movement of the key holding member 7 in the circumferential direction with respect to the stator base 2 is restricted. The knock pin 8 restricts movement of the key 3 in the circumferential direction relative to the key holding member 7. Therefore, the key 3 limits movement of the stator frame 1 in the circumferential direction. Note that the knock pin 8 may be inserted into the key holding member 7 so as to pass through the key holding member 7. Further, when the key holding member 7 is fixed in the groove portion 2C so that movement in the circumferential direction and the radial direction is restricted, the knock pin 8 does not need to be inserted into the stator base 2.

FIG. 13 shows a procedure for holding the stator frame 1 using the holding structure S3 as described above. First, a stator frame 1 in which a frame-side engaging portion 1C is provided in advance, a stator base 2 in which a groove portion 2C is provided in advance, a key holding member 7, and a key 3 are prepared. Then, the stator base 2 is fixed to the foundation BS. Then, as shown in FIG. 13(A), the stator frame 1 is placed on the stator base 2. Then, as shown in FIG. 13(B), the key holding member 7 is provided in the groove portion 2C. Thereafter, as shown in FIG. 13(C), the key 3 is inserted into the frame-side engaging portion 1C and into the key groove portion 7A of the key holding member 7. Thereafter, as shown in FIG. 13(D), the knock pin 8 is driven in such a manner that it straddles the fixed portion 3C, the key holding member 7, and the stator base 2.

Also in this embodiment, it is possible to prevent the stator frame 1 from moving in the circumferential direction with respect to the stator base 2 due to magnetic torque acting on the stator during generator operation. Furthermore, thermal expansion of the stator frame 1 radially outward during generator operation is not restricted. The holding structure S3 eliminates the need for horizontal drilling and welding for fixing the key to the stator base, etc., which were required in conventional structures. Drilling of the knock pin 8 is necessary, but only in the vertical direction. Therefore, the work and man-hours required by special skills can be reduced.

The third embodiment is not limited to the above-described configuration, and may be configured, for example, as in the modified examples shown in FIGS. 14 to 16. FIG. 14 is a top view of a holding structure according to a modification of the third embodiment. FIG. 15 is a diagram showing a state in which some members, specifically the key 3 and the key holding member 7, are removed from the holding structure shown in FIG. 14.

In the modification shown in FIGS. 14 and 15, a groove 2C provided in the stator base 2 is located at the circumferential center of a circle centered on the central axis C that passes through the circumferential center of the outer peripheral surface of the stator base 2. Extends at an angle to the tangent. The key holding member 7 provided in the groove portion 2C also extends so as to be inclined with respect to a tangent passing through the circumferential center of the outer peripheral surface of the stator base 2. In such a configuration, when the stator frame 1 attempts to move in the circumferential direction, the force transmitted from the stator frame 1 to the stator base 2 via the key 3 and the key holding member 7 is transmitted in the longitudinal direction of the groove portion 2C. It is disassembled in the short direction. At this time, the force for moving the key 3 along the key holding member 7 is smaller than when the groove portion 2C is not inclined. Therefore, the key 3 becomes difficult to move, which is advantageous in terms of suppressing movement of the stator frame 1.

Further, FIG. 16 is a top view of a holding structure according to another modification of the third embodiment. In the modification shown in FIG. 16, a protrusion 7B is provided on the top of the key holding member 7. The fixed portion 3C of the key 3 is provided with an engagement hole 3E through which the protrusion 7B is passed. Then, knock pins 8 are driven into the key 3 on both sides of the engagement hole 3E. Thereby, movement of the key 3 in the circumferential direction with respect to the key holding member 7 is restricted.

<Fourth embodiment>
Hereinafter, a stator frame holding structure S4 (hereinafter abbreviated as holding structure S4) for a rotating electrical machine according to a fourth embodiment will be described using FIGS. 17 and 18. FIG. 17 is a longitudinal cross-sectional view of the holding structure S4. FIG. 18 is a view seen in the direction of arrow J in FIG. 17. Among the components in this embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and explanations thereof will be omitted.

In this embodiment, a frame-side engaging portion 1C formed in the flange portion 1B of the stator frame 1 is formed of a hole penetrating in the axial direction. Further, the stator frame 1 includes a rib 1D that is a part of the stator frame 1 or is integrated with the stator frame 1 and extends in the radial direction inside the frame-side engaging portion 1C.

The stator base 2 is not provided with a base-side engaging portion 2A. When the stator frame 1 is placed on the stator base 2, a part of the upper surface of the stator base 2 is exposed through the frame-side engaging portion 1C. Two presser plates 10 are inserted into the frame-side engaging portion 1C, and the presser plates 10 are placed on a portion of the upper surface of the stator base 2 exposed through the frame-side engaging portion 1C. One of the two presser plates 10 is provided on one side in the circumferential direction with respect to the rib 1D, and the other is provided on the other side in the circumferential direction.

The two presser plates 10 sandwich the rib 1D in the circumferential direction while forming a radial gap between the surface of the presser plate 10 facing radially inward and the inner surface of the frame side engaging portion 1C. I'm here. The presser plate 10 is fixed to the stator base 2 by knock pins 8. Note that it is desirable to apply or form a lubricant between the rib 1D and the presser plate 10.

Also in this embodiment, it is possible to prevent the stator frame 1 from moving in the circumferential direction with respect to the stator base 2 due to magnetic torque acting on the stator during generator operation. Furthermore, thermal expansion of the stator frame 1 radially outward during generator operation is not restricted. The holding structure S4 eliminates the need for horizontal drilling and welding for fixing the key to the stator base, etc., which were required in the conventional structure. Drilling of the knock pin 8 is necessary, but only in the vertical direction. The vertical drilling process is performed on the holding plate 10 and the stator base 2 after the stator frame 1 is placed on the stator base 2 and the holding plate 10 is arranged. Therefore, the work and man-hours required by special skills can be reduced.

<Fifth embodiment>
Hereinafter, a stator frame holding structure S5 (hereinafter abbreviated as holding structure S5) for a rotating electrical machine according to a fifth embodiment will be described using FIGS. 19 to 21. FIG. 19 is a longitudinal sectional view of the holding structure S5. FIG. 20 is a view taken in the direction of arrow K in FIG. 19. FIG. 21 is a view taken in the direction of arrow L in FIG. 19. Among the components in this embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals, and explanations thereof will be omitted.

In this embodiment, the stator base 2 is provided with a pair of vertical wall portions 2D spaced apart in the circumferential direction. Bolts 2E are provided on mutually opposing surfaces of the pair of vertical wall portions 2D, respectively. The key 3 includes a first portion 3A inserted into the frame-side engaging portion 1C and a second portion 3B inserted between the pair of bolts 2E. The first portion 3A is configured to engage the frame side in the circumferential direction while forming a radial gap between the surface 3Ai of the first portion 3A facing inward in the radial direction and the inner surface of the frame side engagement portion 1C. It is sandwiched between the inner surfaces of the joint portion 1C. The second portion 3B is fixed to the stator base 2 by being sandwiched between a pair of bolts 2E.

In this embodiment, after determining the position of the stator frame 1 with respect to the stator base 2, the key 3 is inserted into the frame-side engaging portion 1C of the stator frame 1. Thereafter, the stator frame 1 is coupled to the stator base 2 by fixing the key 3 from both sides with bolts 2E provided on the stator base 2. In this embodiment, the work of connecting the stator frame 1 and stator base 2 is completed by simply fixing the key 3 with the bolt 2E. Therefore, the work and man-hours required by special skills can be reduced.

As a modification of the fifth embodiment, a protrusion that protrudes outward in the radial direction from the flange portion 1B of the stator frame 1 may be provided, and this protrusion may be fixed by being sandwiched between a pair of bolts 2E. good. In this case, the bolt 2E and the protrusion are slidably in contact with each other. In this configuration, it is desirable to apply or form a lubricant between the bolt 2E and the protrusion.

Although a plurality of embodiments have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. The above-described embodiments and other modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

S1, S2, S3, S4, S5...Stator frame holding structure of rotating electric machine, SC...Stator core, BS...Foundation, C...Central axis, 1...Stator frame, 1A...Frame body, 1B...Flange portion, 1C... Frame side engaging part, 1D... Rib, 2... Stator base, 2A... Base side engaging part, 2B... Fastening hole, 2C... Groove, 2D... Standing wall part, 2E... Bolt, 3... Key, 3A... 1st part, 3Ai... surface, 3B... second part, 3C... fixed part, 3D... through hole, 3E... engaging hole, 4... filler, 5... bolt, 6... through hole filler, 7... key Holding member, 7A...key groove part, 7B...projection part, 8...knock pin

Claims (13)

a stator frame disposed radially outward of the stator core and provided with a frame-side engaging portion consisting of a hole or groove;
a stator base on which the stator frame is placed and provided with a base-side engaging portion consisting of a hole or a groove;
a key including a first part inserted into the frame-side engaging part and a second part inserted into the base-side engaging part,
The second portion is inserted into and fixed in the base-side engaging portion, and the first portion has a surface that faces inward in the radial direction of the first portion and an inner surface of the frame-side engaging portion. sandwiched between the inner surfaces of the frame-side engaging portions via a filler in the circumferential direction of the stator core while forming the radial gap therebetween;
or
The first portion is inserted and fixed in the frame-side engaging portion, and the second portion has a surface that faces outward in the radial direction of the second portion and an inner surface of the base-side engaging portion. A stator frame holding structure for a rotating electric machine, wherein the stator frame holding structure for a rotating electrical machine is sandwiched between inner surfaces of the base-side engaging portion in the circumferential direction of the stator core with a filler interposed therebetween, while forming the radial gap therebetween. The stator frame holding structure for a rotating electric machine according to claim 1, wherein the filler is a resin. a stator frame disposed radially outward of the stator core and provided with a frame-side engaging portion consisting of a hole or groove;
a stator base on which the stator frame is mounted;
a key including a first part inserted into the frame-side engaging part and a fixed part fixed to the stator base,
The first portion is arranged in the circumferential direction of the stator core while forming the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion. is sandwiched between the inner surfaces of the frame-side engaging portion,
A through hole penetrating in the radial direction is formed in the fixed portion, and a fastening hole extending in the radial direction from an outer peripheral surface of the stator base is formed,
A stator frame holding structure for a rotating electrical machine, wherein the fixed portion is fixed by a fastening member fastened to the fastening hole through the through hole. The fastening member is passed through the through hole in a state where the circumferential gap is formed between the fastening member and the through hole, and the circumferential gap is filled with a through hole filler. The stator frame holding structure of the described rotating electric machine. a stator frame disposed radially outward of the stator core and provided with a frame-side engaging portion consisting of a hole or groove;
a stator base on which the stator frame is mounted;
a key including a first part inserted into the frame-side engaging part and a fixed part fixed to the stator base,
The first portion is arranged in the circumferential direction of the stator core while forming the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion. is sandwiched between the inner surfaces of the frame-side engaging portion,
A stator frame holding structure for a rotating electrical machine, wherein the fixed portion is fixed to the stator base by a knock pin extending in the axial direction of the stator core. further comprising a key holding member fitted into the axially recessed groove formed in the stator base,
The key is provided such that the fixed portion is supported by the key holding member,
The key is fixed to the stator base via the key holding member by the knock pin penetrating the fixed portion and being caught on the key holding member in the circumferential direction or being inserted into the key holding member. The stator frame holding structure for a rotating electric machine according to claim 5, wherein the stator frame holding structure is a stator frame provided with a frame-side engaging portion formed of a hole or groove that is disposed radially outward of the stator core and passes through the stator core in the axial direction;
a stator base on which the stator frame is mounted;
a presser plate inserted into the frame-side engaging portion and placed on the stator base;
a knock pin inserted into the stator base through the presser plate,
The stator frame includes a rib that is part of or integrated with the stator frame and extends in the radial direction inside the frame side engagement part,
The presser plate is arranged in the circumferential direction of the stator core while forming the radial gap between the surface of the presser plate facing inward in the radial direction and the inner surface of the frame-side engaging portion. A stator frame holding structure for a rotating electrical machine that holds ribs in between. a stator frame disposed radially outward of the stator core and provided with a frame-side engaging portion consisting of a hole or groove;
a stator base on which the stator frame is placed and including a pair of vertical walls spaced apart in the circumferential direction of the stator core;
a pair of bolts provided on mutually opposing surfaces of the pair of vertical wall portions;
a key including a first part inserted into the frame-side engaging part and a second part inserted between the pair of bolts,
The first portion is arranged in the circumferential direction of the stator core while forming the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion. is sandwiched between the inner surfaces of the frame-side engaging portion,
A stator frame holding structure for a rotating electrical machine, wherein the second portion is fixed to the stator base by being sandwiched between the pair of bolts. a stator frame disposed radially outward of a stator core and provided with a frame-side engaging portion consisting of a hole or groove; and a stator frame on which the stator frame is placed and having a base-side engaging portion consisting of a hole or groove. preparing a stator base to be provided and a key including a first portion inserted into the frame-side engaging portion and a second portion inserted into the base-side engaging portion;
fixing the stator base to a foundation and mounting the stator frame on the stator base;
attaching the key to the stator frame and the stator base,
In the attaching step,
The second portion is inserted into and fixed in the base-side engaging portion, and the first portion has a surface that faces inward in the radial direction of the first portion and an inner surface of the frame-side engaging portion. sandwiched between the inner surfaces of the frame-side engaging portions via a filler in the circumferential direction of the stator core while forming the radial gap therebetween;
or
The first portion is inserted and fixed in the frame-side engaging portion, and the second portion has a surface that faces outward in the radial direction of the second portion and an inner surface of the base-side engaging portion. A method for holding a stator frame of a rotating electrical machine, wherein the stator frame is sandwiched between the inner surfaces of the base-side engaging portions via a filler in the circumferential direction of the stator core while forming the radial gap therebetween. a stator frame disposed radially outward of the stator core and provided with a frame-side engaging portion consisting of a hole or groove; a stator base on which the stator frame is mounted; preparing a key including a first part to be inserted and a fixed part fixed to the stator base;
fixing the stator base to a foundation and mounting the stator frame on the stator base;
attaching the key to the stator frame and the stator base,
A through hole penetrating in the radial direction is formed in the fixed portion, and a fastening hole extending in the radial direction from an outer peripheral surface of the stator base is formed,
In the attaching step, the first portion is fixed while forming the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame side engaging portion. A stator frame of a rotating electrical machine, which is sandwiched between the inner surface of the frame side engaging part in the circumferential direction of the child core, and the fixed part is fixed by a fastening member fastened to the fastening hole through the through hole. How to hold it. a stator frame disposed radially outward of the stator core and provided with a frame-side engaging portion consisting of a hole or groove; a stator base on which the stator frame is mounted; preparing a key including a first part to be inserted and a fixed part fixed to the stator base;
fixing the stator base to a foundation and mounting the stator frame on the stator base;
attaching the key to the stator frame and the stator base,
In the attaching step, the first portion is fixed while forming the radial gap between the surface of the first portion facing radially inward and the inner surface of the frame side engaging portion. A stator frame of a rotating electrical machine, which is sandwiched between the inner surface of the frame side engaging part in the circumferential direction of the child core, and the fixed part is fixed to the stator base by a knock pin extending in the axial direction of the stator core. How to hold it. A stator frame provided with a frame-side engaging portion formed of a hole or groove that is disposed radially outward of the stator core and passes through the stator core in the axial direction; and a stator on which the stator frame is mounted. preparing a base, a presser plate that is inserted into the frame-side engaging portion and placed on the stator base, and a knock pin that penetrates the presser plate and is inserted into the stator base;
fixing the stator base to a foundation and mounting the stator frame on the stator base;
inserting the presser plate into the frame-side engaging portion and placing it on the stator base;
inserting the knock pin that penetrates the presser plate into the stator base,
The stator frame includes a rib that is part of or integrated with the stator frame and extends in the radial direction inside the frame side engagement part,
The presser plate is arranged in the circumferential direction of the stator core while forming the radial gap between the surface of the presser plate facing inward in the radial direction and the inner surface of the frame-side engaging portion. A method for holding a stator frame of a rotating electric machine, in which the stator frame of a rotating electric machine is fixed by the knock pins with ribs sandwiched therebetween. a stator frame disposed radially outward of the stator core and provided with a frame-side engaging portion consisting of a hole or groove; and a pair of stator frames on which the stator frame is placed and spaced apart in the circumferential direction of the stator core. a stator base including a vertical wall portion, and a pair of bolts are provided on mutually opposing surfaces of the pair of vertical wall portions, and a first portion inserted into the frame-side engaging portion and the pair of bolts. a key including a second portion that is
fixing the stator base to a foundation and mounting the stator frame on the stator base;
attaching the key to the stator frame and the stator base,
In the step of attaching the key, the first portion forms the radial gap between the surface of the first portion facing inward in the radial direction and the inner surface of the frame-side engaging portion; A stator frame of a rotating electric machine, the stator frame being sandwiched between the inner surfaces of the frame-side engaging portions in the circumferential direction of the stator core, and the second portion being fixed to the stator base by being sandwiched between the pair of bolts. How to hold it.