JP2003333786A - Electric rotating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an electric rotating machine in which reliability of insulation can be ensured at the coil end part by preventing insulation at the coil end part from being damaged by discharge occurring between the coil end parts of a stator coil at the time of withstand voltage test. <P>SOLUTION: The stator coil 3 has a coil end part 3a extended from a core slot part 2 and a low resistance corona shield layer 7 and a high resistance corona shield layer 8 are provided on the surface of the coil end part 3a. When a shift from the position of shortest distance is present, as shown on Fig. 1, between the end part A of the low resistance corona shield layer 7 of earth potential provided on the coil end part 3a of one stator coil 3 and the end part B of the low resistance corona shield layer 7 provided on the coil end part 3a of the other adjacent stator coil 3, discharge possibly takes place between the end parts A and B at the time of withstand voltage test. It is prevented by inserting an insulation member 17 into the gap between the adjacent coil end parts 3a thus preventing the coil end part 3a from being damaged at the time of withstand voltage test. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved rotary electric machine, and more particularly to a rotary electric machine capable of ensuring reliability of insulation.

[0002]

10 and 11 show a conventional high voltage synchronous generator. FIG. 10 is a perspective view showing a stator coil housed in an iron core slot portion of a stator core, and FIG. FIG. 4 is a plan view showing a main part of a stator coil housed in an iron core slot portion of a stator iron core. In these figures, 1 is a stator core having a cylindrical inner peripheral portion, 2 is a stator core 1
Is an iron core slot portion provided on the inner peripheral portion of the.

Reference numeral 3 denotes a stator coil, which is housed in the iron core slot portion 2 and has a coil end portion 3a extending from the iron core slot portion 2 to the axially outer side of the stator iron core 1. As shown in FIG. 11, the coil end portion 3a has a linear extending portion at the place where it exits from the iron core slot portion 2, and then passes through a curved portion for connecting to the next stator coil 3 not shown. It has a straight portion bent in a predetermined direction. The stator coil 3 has a conductor 5 composed of a large number of rectangular copper wires having a surface coated with an insulating varnish, and a main ground insulating layer 6 covering the conductor 5. An armature coil is formed by the plurality of stator coils 3.

A low-resistance corona shield layer 7 is provided on the outer peripheral portion of the coil end portion 3a beyond the curved portion thereof. Reference numeral 8 denotes a high resistance corona shield layer, which is connected to the low resistance corona shield layer 7 and is provided on the outer peripheral portion of the coil end portion 3a. The high-resistivity corona shield layer 8 and the low-resistivity corona shield layer 7 are partially overlapped with each other in the length direction of the coil end portion 3a and are provided in series in divided regions.

The end of the low resistance corona shield layer 7 connected to the high resistance corona shield layer 8 has a coil end 3a.
End portions A and B of the low-resistance corona shield layer 7 on the adjacent coil end portions 3a which are formed obliquely with respect to the length direction of the
(Fig. 11) is installed so as to have the shortest distance. 1
Reference numeral 0 denotes a wedge (Fig. 10), which prevents the stator coil 3 housed in the iron core slot 2 from protruding.
Holding down.

By the way, in the case of product inspection, the synchronous generator is generally subjected to a withstand voltage test by applying a high voltage, which is at least twice the rated voltage, to the stator coil 3. This withstand voltage test is performed not only by applying a voltage to each stator coil 3 before housing it in the iron core slot portion 2, but also in a state where the stator coil 3 is housed in the iron core slot portion 2. As described above, the stator coil 3 has the core slot portion 2
A low resistance corona shield layer 7 and a high resistance corona shield layer 8 each having a predetermined resistance value are provided on the outer peripheral portion of the coil end portion 3a extending from the. This suppresses the occurrence of discharge between the coil end portions 3a when a high voltage is applied during the withstand voltage test.

Further, the end portions of the low resistance corona shield layer 7 are formed obliquely so that the end portions A and B of the low resistance corona shield layers 7 of the adjacent coil end portions 3a have the shortest distance. . Therefore, even when a high voltage is applied, the potentials of the opposing portions of the adjacent coil end portions 3a do not change so much because both the end portions A and B are located on the low resistance corona shield layer 7. Therefore, for example, even if a high voltage twice or more the rated voltage value is applied, discharge can be prevented, and in principle, sufficient withstand voltage characteristics can be obtained.

[0008]

As described above, in the conventional synchronous generator as the rotary electric machine, the end of the low resistance corona shield layer 7 connected to the high resistance corona shield layer 8 is connected to the length of the coil end 3a. It is formed obliquely in the vertical direction. In order to form the low resistance corona shield layer 7 obliquely, before the stator coil 3 is housed in the iron core slot portion 2, for example, a low resistance paint is applied to the coil end portion 3a or a low resistance tape is wound. Alternatively, a low resistance sheet may be attached to form.

However, in any case, accurate dimension measurement and highly accurate masking work with a masking tape or the like are required, and all coil end portions 3a must be formed in the same manner. However, this is very difficult in terms of manufacturing technology, and it is troublesome and costly.

Further, even when the end portion of the low resistance corona shield layer 7 is accurately formed in the state of the stator coil 3 alone,
The position of the end of the low-resistance corona shield layer 7 may be displaced by about 10 mm when the stator coil 3 is housed in the iron core slot portion 2 due to manufacturing variations. In addition, the gap between the adjacent coil end portions 3a may be narrower than the designed value, and the resistance value of the high resistance corona shield layer 8 may vary.

Further, since the end portion of the low resistance corona shield layer 7 is wound under the high resistance corona shield layer 8 and a protective tape for preventing scratches is further wound on the end portion, the positional deviation is visually observed. I can't confirm. Therefore, the above-mentioned factors are added to the positional displacement of the end portion of the low resistance corona shield layer 7, and the end portion A,
The potential difference between the end portions B becomes large, and the adjacent coil end portions 3
There was a risk of electric discharge occurring between a and a.

The present invention has been made to solve the above-mentioned problems, and discharge is generated between the coil ends of the stator coil during the withstand voltage test, so that the coil ends are insulated. An object of the present invention is to obtain a rotating electric machine that can prevent damage and can ensure reliability of insulation of coil end portions.

[0013]

In order to achieve the above object, a rotating electric machine according to the present invention is a rotating electric machine having a stator coil, first and second corona shield layers, and an insertion member. , A plurality of stator coils are provided, each of which has a coil end portion which is housed in an iron core slot portion of the stator core and extends from the iron core slot portion, and the stator coils are adjacent to each other. The child coil and the coil ends thereof are arranged to face each other with a gap, and the first corona shield layer has a predetermined electric resistance,
The second corona shield layer has a higher electrical resistance than the first corona shield layer, and the insertion member is made of an insulating material,
The first corona shield layer is provided on the surface of the coil end portion, and the second corona shield layer is on the side opposite to the iron core slot portion of the first corona shield layer and connected to the first corona shield layer. The insertion member provided on the surface of the coil end portion is provided in a gap between the coil end portions over a predetermined range from the first corona shield layer to the terminal end portion of the second corona shield layer. And the dimension in the direction intersecting with the direction in which the coil ends face each other is larger than that in the coil ends. During a withstand voltage test, between the coil ends arranged with a gap in a predetermined direction, that is, between one coil end and the other coil end,
A high voltage is applied between the first corona shield layer provided on the surface of one coil end and the second corona shield layer provided on the surface of the other coil end, and between one and the other. The electric field strength between the second corona shield layers provided at the coil ends may become high, and discharge may occur, damaging the coil ends. The discharge between the parts is suppressed, and the insulation at the coil end is prevented from being damaged.

The insertion member is a plate-shaped insulating member. The insulating member suppresses the discharge between the coil ends during the withstand voltage test and prevents the insulation of the coil ends from being damaged.

The insertion member is characterized in that it is a plate-shaped insulating member having a through hole forming portion which forms a through hole penetrating in a direction intersecting the direction in which the coil ends face each other. Since the cooling medium can pass through the through holes, the heat generated at the coil end can be efficiently cooled.

The insert member is an insulating insert member whose thickness is smaller than the gap between the coil end portions by a predetermined dimension, and has a gap between the insulating insert member and the coil end portion or between the insulating insert members. One or a plurality of sheets are thus provided. Since the cooling medium can pass through the gap, the heat generated at the coil end can be efficiently cooled.

A plurality of insertion members are connected by a connecting member. Since the insertion members are connected by the connecting member, they can be inserted together,
Insertion time can be shortened.

The insertion member is a thin plate-shaped or sheet-shaped elastic member formed of an insulating material having a predetermined elasticity.
It is characterized in that it is provided in the gap between the coil ends such that the shape of the coil ends when viewed from the direction intersecting with the facing direction is U-shaped. The elastic member can be elastically deformed and easily inserted into the gap between the coil end portions, and the working time is shortened.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 to 4 show a high-voltage synchronous generator as a rotating electric machine that is an embodiment of the present invention. FIG. 1 shows the structure of a stator coil housed in an iron core slot portion of a stator core. A plan view showing the part,
FIG. 2 is a cross-sectional view showing a cross section of the stator coil. Figure 3,
FIG. 4 is an explanatory diagram for explaining the occurrence of discharge during a withstand voltage test. In FIGS. 1 and 2, 1 is a stator core having a cylindrical inner peripheral portion, and 2 is an iron core slot portion provided in the inner peripheral portion of the stator iron core 1.

A stator coil 3 is housed in the iron core slot portion 2 and has a coil end portion 3a extending from the iron core slot portion 2 to the axially outer side of the stator iron core 1. As shown in FIG. 1, the coil end portion 3a has a linear extending portion at the place where it exits from the iron core slot portion 2, and then passes through a curved portion for connecting to the next stator coil 3 not shown. It has a straight portion bent in a predetermined direction. The stator coil 3 has a conductor 5 composed of a large number of rectangular copper wires having a surface coated with an insulating varnish, and a main ground insulating layer 6 covering the conductor 5. An armature coil is formed by the plurality of stator coils 3.

Reference numeral 7 denotes a low resistance corona shield layer as a first corona shield layer, which is provided on the outer peripheral portion of the coil end portion 3a beyond the curved portion of the coil end portion 3a. Reference numeral 8 denotes a high resistance corona shield layer as a second corona shield layer, which is connected to the low resistance corona shield layer 7 and is provided in a predetermined range as shown in FIG. 1 on the outer peripheral portion of the coil end portion 3a. . The high-resistivity corona shield layer 8 and the low-resistivity corona shield layer 7 are partially overlapped in series in the longitudinal direction of the coil end 3a, and the high-resistivity corona shield layer 8 is the core slot of the low-resistivity corona shield layer 7. The area is divided so as to be on the side opposite to the part 2 side.

The end of the low resistance corona shield layer 7 connected to the high resistance corona shield layer 8 has a coil end 3a.
Of the low resistance corona shield layer 7 formed on the coil end 3a of another adjacent stator coil 3 adjacent to each other so as to be the shortest distance. ing. That is, the connecting portions where the high resistance corona shield layer 8 and the low resistance corona shield layer 7 are connected on the coil ends 3a of the adjacent stator coils 3 are installed so as to face each other at the shortest distance. . However, in FIG. 1, due to manufacturing errors and the like, the end A and the end B are viewed from a direction perpendicular to the paper surface of FIG. 1, that is, a direction perpendicular to the direction in which the coil ends 3a face each other. , A state in which the coil end portion 3a is slightly displaced in the length direction is illustrated.

Reference numeral 17 denotes an insulating member as an insertion member, which is a plate-shaped member having a rectangular cross section and is inserted into and removed from the gap between the adjacent coil end portions 3a. Further, the insulating member 17 has a barrier effect against discharge between the coil end portions 3a as shown in FIG.
It is formed so that a is adjacent to each other and is larger than the coil end 3a by a predetermined dimension in a direction intersecting with a facing direction.

As shown in FIG. 1, the insulating member 17 includes a connecting portion between the low resistance corona shield layer 7 and the high resistance corona shield layer 8 provided at the coil end portion 3a, and the low resistance corona shield layer 8 has a low resistance. The resistance corona shield layer 7 is provided so as to extend beyond the end portion on the opposite side to the portion where the ground main insulating layer 6 is exposed.

By the way, for the low resistance corona shield layer 7 as described above, for example, carbon powder mixed paint is used for the coil end portion 3.
It can be formed by applying to the outer peripheral portion of a. Further, the high resistance corona shield layer 8 can be formed, for example, by applying a coating material containing silicon carbide to the outer peripheral portion of the coil end portion 3a. The corona shield layers 7 and 8 are, for example, a tape coated with a coating containing carbon powder, a tape coated with a coating containing silicon carbide particles, or a tape made of a synthetic resin containing iron powder. It can also be easily formed by winding around the outer circumference of the coil end 3a.

As the insulating member 17, for example, a thick polyester non-woven fabric impregnated with a room temperature curing epoxy resin, or a glass epoxy laminated plate wrapped with a polyester non-woven fabric impregnated with a room temperature curing epoxy resin is wound. It is formed by a tatami mat.

Next, the withstand voltage test of the synchronous generator will be described. The withstand voltage test of the synchronous generator is carried out by applying a voltage twice or more the rated voltage with the stator coil 3 housed in the iron core slot portion 2. As described above, the coil end portion 3a is a straight portion at the place where the coil end portion 3a exits from the iron core slot portion 2, and thereafter, in order to connect to the coil end portion of the next stator coil 3, the coil end portion 3a passes through the curved portion and moves in a fixed direction. It is bent to face.

When a high voltage is applied, a large potential difference is generated between the adjacent coil end portions 3a, which triggers the high resistance corona shield layer 8 which is the high potential portion of the coil end portion 3a and the adjacent coil. There is a possibility that discharge such as creeping flashover may occur between the end portion 3a and the low-resistance corona shield layer 7, which is the ground potential.

Therefore, in this embodiment, before the withstand voltage test, the insulating member 17 is first inserted into the gap between the adjacent coil end portions 3a. After that, a withstand voltage test is performed, and when the test is completed, the insulating member 17 is removed.
Since the insulating member 17 is installed during the withstand voltage test, the discharge can be suppressed even if a large potential difference occurs between the adjacent coil ends 3a, and the low resistance corona shield layer 7 which is the ground potential and the potential. High resistance corona shield layer 8
It is possible to prevent the flashover between and, and to eliminate the possibility of damaging the insulation, and to ensure the reliability of the insulation of the synchronous generator.

In this embodiment, a case in which the corner portions C and D, which are close in spatial distance between the adjacent coil end portions 3a, are compared will be described with reference to FIGS. 3 and 4. In the coil end portion 3a shown in FIG. 4, since the electric field at the corners is high, the discharge is most likely to occur between the corners C and D facing each other. When the insulating member 17 does not exist, the corner C and the corner D are easily discharged, and the potential of the corner D becomes almost equal to that of the corner C by the discharge.

The electric potential of the corner portion D becomes equal to that of the corner portion C which is higher than the electric potential before the discharge due to the discharge, but the distances between the corner portion D and the end portion E and between the corner portion D and the end portion B are secured. If not, and the surrounding air is ionized by the discharge, it becomes easier to discharge, and the discharge flashes in the route of corner C → corner D → end E or corner C → corner D → end B. There is a risk that

However, when the insulating member 17 is present, even if the electric field at the corner C is high and even a slight partial discharge starts, the insulating member 17 causes the discharge to reach the corner D, resulting in a completely discharged state. And the discharge is limited to the partial discharge in the vicinity of the corner C, so that the flashover to the low resistance corona shield layer 7 is prevented. Generally, the creepage flashover voltage is
Since the flashover voltage increases as the protruding dimension of the insulating member 17 increases, the preventing effect increases as the insulating member 17 projects more than the coil end 3a.

If the insulating member 17 does not project in the vertical direction in FIG. 2 from the coil end 3a, the discharge from the corner C of the coil end 3a to the corner D of the adjacent coil end 3a is performed. Since it is likely to occur, the effect of suppressing the discharge between the corner portions C and D is small. However, as shown in FIG. 2, since the insulating member 17 is protruded in the vertical direction more than the coil end portion 3a, the discharge path becomes longer, so that the corner C
It becomes difficult to generate a discharge that connects between the corner D and the corner D. Therefore, it is possible to prevent the discharge generated between the adjacent coil ends 3a.

The insulating member 17 may be left after the test. In addition, after inserting the stator coil 3 into the iron core slot portion 2 and inserting the insulating member 17 between the coil end portions 3a in advance and fixing them with an adhesive, a withstand voltage test is performed. Good. In this case, the insulating member 17 is left as it is after the withstand voltage test is completed.

Embodiment 2. FIG. 5 is a sectional view showing a section of a stator coil according to another embodiment of the present invention. In FIG. 5, reference numeral 20 denotes a connecting / inserting member, and the separating member 27 is connected by a connecting member 22 via a flexible member 23 having a predetermined flexibility so as to form a comb shape as a whole. . The separating member 27 is made of the same material as the inserting member 17 in FIG. 1 and has the same shape, and is inserted between the coil end portions 3a. Since other configurations are the same as those of the first embodiment shown in FIG. 1, corresponding components are designated by the same reference numerals and description thereof will be omitted.

Since the plurality of separating members 27 are connected by the connecting member 22, the separating members 27 can be inserted and removed together, and the work time of the insertion and removal after the start and the end of the test can be shortened. . The coil end 3a to be inserted
Even if there is a variation in the mutual gap, the flexible member 23 bends and absorbs, so that the separation member 27 can be easily inserted. Alternatively, the entire connecting / inserting member 20 may be formed of a flexible insulating material. The connecting insert member 20 may be left after the test is completed.

Embodiment 3. 6 and 7 show another embodiment of the present invention. FIG. 6 is a plan view showing a main part of a stator coil housed in an iron core slot portion of a stator core, and FIG. It is a perspective view of an insulating member with a hole. In these drawings, reference numeral 37 denotes an insulating member with a hole as an insertion member. Through-hole forming portions 39 that form elliptical through-holes are provided at predetermined intervals (see also FIG. 7). The outer dimensions of the insulating member 37 with holes are the same as those of the insulating member 17 in FIG.

The perforated insulating member 37 is used for the coil end 3
After a is accommodated in the iron core slot portion 2, it is inserted and fixed between the adjacent coil end portions 3a. Since other configurations are the same as those of the first embodiment shown in FIG. 1, corresponding components are designated by the same reference numerals and description thereof will be omitted.

A withstand voltage test is carried out with such an insulating member 37 with a hole inserted. In this embodiment, the insulating member 37 with holes is left as it is even after the withstand voltage test is completed. During operation of the rotating electric machine, air or a cooling medium such as hydrogen flows in the through-hole in the large-sized synchronous generator as shown by an arrow in FIG.
The heat generated in a can be efficiently cooled and the temperature rise can be suppressed. Therefore, it is possible to obtain a rotating electric machine with excellent cooling performance while maintaining the function of suppressing creeping flashover.

Fourth Embodiment FIG. 8 is a sectional view showing a section of a stator coil according to another embodiment of the present invention. In FIG. 8, 47 is an insulating insertion member as an insertion member. The insulating insertion member 47 is a thin plate or sheet made of an insulating material, is formed to have a predetermined size smaller than the gap between the coil end portions 3a, and is fixed to the right coil end portion 3a which is one of the adjacent coil end portions 3a. ing. The insulating insertion member 47 is provided so as to have a gap between it and the left coil end portion 3a which is the other of the adjacent coil end portions 3a. The insulating insertion member 47 is the coil end 3
It is formed so as to protrude by a predetermined dimension in the vertical direction in FIG.

It should be noted that one insulating insert member 47 is provided at each of the opposing facing portions of the adjacent coil end portions 3a.
You may fix so that there may be a gap between both insulating insertion members 47. Although this insulating insertion member 47 is left as it is after the withstand voltage test is completed, there is a gap between the adjacent coil end portions 3a or between the insulating insertion members 47 so that a passage for the cooling medium is secured. Therefore, the rotating electric machine having excellent cooling performance can be obtained without impairing the cooling property of the coil end portion 3a.

Embodiment 5. FIG. 9 is a plan view showing a main part of a stator coil housed in an iron core slot portion of a stator core according to another embodiment of the present invention. Figure 9
In the figure, 57 is an elastic member as an insertion member. The elastic member 57 is made by inserting a thin plate made of an insulating material having a predetermined elasticity into a U-shape as shown in FIG. 9 and inserting it into the gap between the adjacent coil end portions 3a, and the sheet in FIG. A predetermined size is projected in a direction perpendicular to the.

In this way, the elastic member 37 having a predetermined elasticity is elastically deformed into a U shape, and the adjacent coil end portions 3 are formed.
Since the elastic member 37 itself is inserted into the gap between the a, the elastic force of the coil end portion 3a can be obtained by elastically deforming the elastic member 37 into a U shape and inserting the elastic member 37 without any special fixing work. It is held in between and can be easily inserted and removed for testing. Furthermore, by making the elastic member 57 U-shaped, the passage of the cooling medium is secured, so there is no risk of impairing the cooling performance. When left as it is after the withstand voltage test is completed, the elastic member 57 is fixed to the coil end portions 3a on both sides so as not to fall off without depending on the elastic force of the elastic member 57. In this case, the labor of removal can be omitted.

The insertion member shown in each of the above-mentioned embodiments is necessary for preventing flashover during the withstand voltage test, but since the voltage during operation is sufficiently low as compared with the withstand voltage test, the insert member does not flash. The risk of entanglement is very low and need not be left after the test. However, it may be left as it is in order to save the trouble of removal.

Further, in each of the above embodiments, the end portion of the low resistance corona shield layer 7 connected to the high resistance corona shield layer 8 is formed obliquely with respect to the length direction of the coil end portion 3a and is adjacent to the coil end portion 3a. It has been shown that the end portions A and B (see FIG. 1) of the low resistance corona shield layer 7 on the matching coil end portion 3a are installed with the intention of providing the shortest distance.
The present invention is not limited to this, and the same effect can be obtained even if the end of the low resistance corona shield layer 7 is formed at a right angle to the length direction of the coil end 3a.
Further, the rotating electric machine is not limited to the synchronous generator, but the synchronous electric motor,
The same effect can be obtained with other rotating electric machines such as induction motors and induction generators.

[0046]

Since the present invention is constructed as described above, it has the following effects.

The rotary electric machine according to the present invention is a rotary electric machine having a stator coil, first and second corona shield layers, and an insertion member, and a plurality of stator coils are provided. , Each having a coil end portion housed in an iron core slot portion of the stator core and extending from the iron core slot portion, and the stator coils are adjacent to each other with a gap between the adjacent stator coils and the coil end portions. The first corona shield layer has a predetermined electric resistance, the second corona shield layer has a higher electric resistance than the first corona shield layer, and the insertion member is made of an insulating material. The first corona shield layer is provided on the surface of the coil end portion, and the second corona shield layer is on the opposite side of the core slot portion of the first corona shield layer from the first corona shield layer. The insertion member is provided in contact with the surface of the coil end portion, and the insertion member is provided in a gap between the coil end portions over a predetermined range from the first corona shield layer to the end portion of the second corona shield layer. Since the dimension in the direction intersecting with the direction in which the coil ends face each other is larger than the coil end, the coil ends arranged with a gap in a predetermined direction during the withstand voltage test. A high voltage is applied between the coil ends, that is, between one coil end and the other coil end, and the first corona shield layer provided on the surface of the one coil end and the other coil end. Between the second corona shield layer provided on the surface of the coil part and the second corona shield layer provided on one and the other coil ends.
Although the electric field strength between the corona shield layers may increase and discharge may occur and damage the coil ends, the provision of an insertion member suppresses the discharge between the coil ends during the withstand voltage test, It is possible to prevent the insulation of the coil end portion from being damaged and to obtain a rotating electric machine with high insulation reliability.

Since the insertion member is a plate-shaped insulating member, the insulating member suppresses the discharge between the coil ends during the withstand voltage test and damages the insulation of the coil ends. It is possible to obtain a rotating electrical machine with high insulation reliability by preventing the electric shock.

Since the insertion member is a plate-shaped insulating member having a through hole forming portion which forms a through hole penetrating in a direction intersecting the direction in which the coil ends are opposed to each other, the insertion member is characterized in that Since the cooling medium can pass through the through holes, it is possible to efficiently cool the heat generated at the coil end portion, and it is possible to obtain a rotating electric machine having excellent cooling performance.

The insert member is an insulating insert member whose thickness is smaller than the gap between the coil end portions by a predetermined dimension, and has a gap between the insulating insert member and the coil end portion or between the insulating insert members. Since one or more sheets are provided in this way, the cooling medium can pass through the gap, so that the heat generated at the coil end can be efficiently cooled, and the rotation with excellent cooling performance can be achieved. You can get an electric machine.

Since a plurality of insertion members are connected by the connecting member, since the inserting members are connected by the connecting member, they can be inserted all at once, and the insertion work time can be increased. It can be shortened and the manufacturing cost can be reduced.

The insertion member is a thin plate-shaped or sheet-shaped elastic member formed of an insulating material having a predetermined elasticity.
Since the coil end portions are provided in the gap between the coil end portions so that the shape when viewed from the direction intersecting with the direction in which the coil end portions face each other is U-shaped, the elastic member is elastically deformed. It is possible to easily insert the coil into the gap between the ends of the coil, the working time is shortened, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of a stator coil housed in an iron core slot portion of a stator core according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a cross section of the stator coil of FIG.

FIG. 3 is an explanatory diagram for explaining the occurrence of discharge during a withstand voltage test.

FIG. 4 is an explanatory diagram for explaining the occurrence of discharge during a withstand voltage test.

FIG. 5 is a cross-sectional view showing a cross section of a stator coil according to another embodiment of the present invention.

FIG. 6 is a plan view showing a main part of a stator coil housed in an iron core slot portion of a stator core according to another embodiment of the present invention.

7 is a perspective view of the insulating member with holes in FIG.

FIG. 8 is a cross-sectional view showing a cross section of a stator coil according to another embodiment of the present invention.

FIG. 9 is a plan view showing a main part of a stator coil housed in an iron core slot portion of a stator core according to another embodiment of the present invention.

FIG. 10 is a perspective view showing a stator coil housed in an iron core slot portion of a stator core of a conventional synchronous generator.

11 is a plan view showing a main part of a stator coil housed in an iron core slot portion of the stator iron core of FIG.

[Explanation of symbols]

1 stator core, 2 core slot part, 3 stator coil, 3a coil end part, 7 low resistance corona shield layer,
8 High resistance corona shield layer, 17 Insulation member, 20
Connection insertion member, 22 connection member, 27 separation member, 37
Insulation member with hole, 39 through hole forming portion, 47 insulation insertion member, 57 elastic member.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H603 AA04 AA12 AA15 BB02 BB09                       BB12 CA01 CA05 CB03 CB23                       CB24 CB26 CC04 CC17 CD02                       CD12 CD22 CE05 EE13 EE21                       FA02 FA16                 5H604 AA01 AA08 BB03 BB10 CC01                       CC05 CC14 DA14 DB01 DB26                       PB02 PB03 PD02 PD04 PD06                       QA01

Claims (6)

[Claims] 1. A rotary electric machine having a stator coil, first and second corona shield layers, and an insertion member, wherein a plurality of stator coils are provided, each of which is a stator. The stator has a coil end portion that is housed in an iron core slot portion and extends from the iron core slot portion, and the stator coils face each other with the adjacent stator coils and the coil end portions being spaced apart from each other. And the first corona shield layer has a predetermined electric resistance,
The second corona shield layer has a higher electric resistance than the first corona shield layer, the insertion member is made of an insulating material, and the first corona shield layer is provided on the surface of the coil end portion. The second corona shield layer is provided on the surface of the coil end portion on the side opposite to the iron core slot portion of the first corona shield layer and in contact with the first corona shield layer, The insertion member is provided in the gap between the coil end portions over a predetermined range from the first corona shield layer to the end portion of the second corona shield layer, and the coil end portion is provided. The dimension in the direction intersecting with the direction in which they face each other is larger than the coil end portion,
Rotating electric machine. 2. The rotary electric machine according to claim 1, wherein the insertion member is a plate-shaped insulating member. 3. The insertion member is a plate-shaped insulating member having a through hole forming portion that forms a through hole penetrating in a direction intersecting a direction in which the coil ends face each other. The rotary electric machine according to claim 2, which is characterized in that. 4. The insert member is an insulating insert member whose thickness is smaller than the gap between the coil end portions by a predetermined dimension, and is between the insulating insert member and the coil end portion or the insulating insert member. The rotary electric machine according to claim 1, wherein one or more sheets are provided so that a gap is provided between them. 5. The rotating electric machine according to claim 2, wherein a plurality of the inserting members are connected by a connecting member. 6. The insertion member is a thin plate-shaped or sheet-shaped elastic member formed of an insulating material having a predetermined elasticity, and has a shape viewed from a direction intersecting a direction in which the coil ends face each other. The rotating electric machine according to claim 1, wherein the rotating electric machine is provided in the gap between the coil ends so as to have a U shape.