JP2021175287A - Rotor of rotary electric machine and manufacturing method of the same - Google Patents

Abstract

To reduce the rotor axial dimension of a coil end without interfering with the cooling of the coil end.SOLUTION: A rotor of a rotary electric machine includes: a rotor iron core provided with a plurality of slots extending in a rotor axial direction and spaced circumferentially apart on an outer diameter side; and a rotor coil in which a lower coil piece and an upper coil piece are arranged in each slot. The lower coil piece arranged in one of the slots and the upper coil piece arranged in another one of the slots each have a coil end extending outward from an axial iron core end of the rotor iron core. The respective coil ends are configured to be electrically connected to each other. Each of the coil ends of the lower coil piece and the upper coil piece has a portion whose extending direction turns from an axial direction of the rotor iron core toward an inner diameter direction, and a portion whose extending direction turns from the inner diameter direction toward a direction in which the respective coil ends become closer to each other.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a rotor of a rotary electric machine and a method for manufacturing the same.

Among the large-scale generator motors delivered to pumped storage power plants, for example, in the variable speed generator motor, the rotor has a three-phase winding structure. In a rotary electric machine equipped with a three-phase winding type rotor, an upper coil piece and a lower coil piece are arranged in individual slots provided on the outer diameter side of the rotor core, and the outer diameter side of the slot is closed by a slot wedge. NS.

On the axial end side of the rotor core, there are coil ends (hereinafter, referred to as "coil end portions") of the upper coil piece and the lower coil piece that protrude outward from the slot. This coil end cannot be held by the iron core and slot wedge. Therefore, in the coil end portion, for example, a plurality of U-shaped support members called U bolts are passed through the space between the individual coil pieces from the rotor outer diameter side, and the support ring is arranged on the rotor inner diameter side. By fixing it to the coil end, the centrifugal force acting on the coil end is transmitted to the support ring, and the coil end is supported by the annular rigidity of the support ring, or the coil end is supported by using a bind wire. It is generally adopted.

Japanese Unexamined Patent Publication No. 6-335188

When the support method using U bolts is adopted, since there is a space between the coil pieces through which the U bolts pass at the coil end portion, the circulation of refrigerant such as air around the coil end portion is easy and the cooling is excellent. Since it is necessary to secure a gap for passing the coil end portion, the dimension of the coil end portion in the rotor axial direction tends to be large, and the axial length dimension of the rotor tends to be large. Therefore, in the support method using U bolts, it is difficult to reduce the size of the coil end portion.

On the other hand, when the support method using the bind wire is adopted, since it is not necessary to pass the U bolt, the dimension between the coil pieces can be minimized and the dimension of the coil end portion in the rotor axis direction can be reduced. In addition to the narrow space between the coil pieces, it is difficult to sufficiently cool the coil end portion because the outer diameter side of the coil end portion is closed by a bind wire.

An object to be solved by the present invention is to provide a rotor of a rotary electric machine and a method for manufacturing the same, which does not hinder the cooling of the coil end portion and can reduce the dimension of the coil end portion in the rotor axial direction.

According to the embodiment, a rotor core in which a plurality of slots extending in the rotor axis direction are provided apart in the circumferential direction on the outer diameter side, and a rotation in which a lower coil piece and an upper coil piece are arranged in each slot. A rotor of a rotating electric machine including a child coil, the lower coil piece arranged in a certain slot and the upper coil piece arranged in another slot are the axial cores of the rotor core, respectively. It has a coil end portion extending outward from the end, and each coil end portion is configured to be electrically connected to each other, and each coil end portion of the lower coil piece and the upper coil piece is A rotary electric machine having a portion in which the extending direction is oriented from the axial direction of the rotor core to the inner diameter direction, and a portion in which the respective coil end portions are further oriented in the direction closer to each other from the inner diameter direction. A rotor is provided.

According to the present invention, there is no problem in cooling the coil end portion, and the dimension of the coil end portion in the rotor axial direction can be reduced.

The figure which shows an example of the structure when a part of the rotor of the rotary electric machine which concerns on 1st Embodiment is seen in the circumferential direction. The figure which shows an example of the structure when a part of the rotor of the rotary electric machine which concerns on the same embodiment is seen in the axial direction. The figure which shows an example of the structure when a part of the rotor of the rotary electric machine which concerns on 2nd Embodiment is seen in the circumferential direction. The figure which shows an example of the structure when a part of the rotor of the rotary electric machine which concerns on 3rd Embodiment is seen in the circumferential direction. The figure which shows an example of the structure when a part of the rotor of the rotary electric machine which concerns on the same embodiment is seen in the axial direction. The figure which shows an example of the structure when a part of the rotor of the rotary electric machine which concerns on 4th Embodiment is seen in the circumferential direction. The figure which shows an example of the structure when a part of the rotor of the rotary electric machine which concerns on 5th Embodiment is seen in the axial direction.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
First, the first embodiment will be described with reference to FIGS. 1 and 2.

The rotary electric machine according to the present embodiment is a variable speed generator motor used in, for example, a pumped storage power plant, and the rotor thereof is a three-phase winding type rotor. The same applies to the rotary electric machine of each embodiment described later.

FIG. 1 is a diagram showing an example of a structure when a part of the rotor of the rotary electric machine according to the first embodiment is viewed in the circumferential direction. Further, FIG. 2 is a diagram showing an example of a structure when a part of the rotor of the rotary electric machine according to the same embodiment is viewed in the axial direction.

The rotary electric machine according to the present embodiment includes a rotor that rotates around the rotation shaft 0 and a stator (not shown) arranged with a gap around the rotor. The rotor is provided with a rotor core 1, and the rotor core 1 is provided with a plurality of slots 1-a extending in the rotor axial direction so as to be spaced apart from each other in the circumferential direction on the outer diameter side.

In each slot 1-a, the lower coil piece 2 and the upper coil piece 3 constituting the rotor coil are arranged in a two-stage configuration. An insulating material (not shown) is arranged between the lower coil piece 2 and the upper coil piece 3 and around them. Further, the lower coil piece 2 and the upper coil piece 3 are fixed by closing the outer diameter side of the slot 1-a with the slot wedge 4.

In the rotor coil, the lower coil piece 2 arranged in one slot 1-a and the upper coil piece 3 arranged in another slot 1-a are outside from the axial core end of the rotor core 1, respectively. It has a coil end portion extending to, and is manufactured so that each coil end portion is electrically connected to each other.

In the present embodiment, the coil end portions of the lower coil piece 2 and the upper coil piece 3 extending outward from the axial core end of the rotor core 1 extend in the axial direction of the rotor core 1. In the process of turning toward the inner diameter direction (for example, the direction perpendicular to the rotor axis direction) 2-x, 3-x and further toward the inner diameter direction, the respective coil end portions are twisted from each other from the inner diameter direction. It has a portion that turns in the approaching direction (that is, a portion that changes its direction slightly in the circumferential direction) 2-y and 3-y.

Further, in the present embodiment, the ends of the portions where the coil end portions of the lower coil piece 2 and the upper coil piece 3 extend in a direction closer to each other are electrically connected to each other by a member 5 having electrical conductivity. Will be done. A brazing or the like may be applied to this connection.

According to this embodiment, the axial dimension of each coil end portion can be reduced. Further, in cooling the coil end portion, since a space through which the refrigerant passes can be secured between the coil pieces, the surrounding refrigerant circulates with the rotation of the rotor, so that the cooling can be performed without any trouble.

Further, since the member 5 having electrical conductivity is connected on the inner diameter side of the rotor, it is possible to simplify the connection structure with the mouthpiece copper band and the support structure thereof.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. The elements common to the first embodiment are designated by the same reference numerals, and duplicate description will be omitted. Hereinafter, the parts different from the first embodiment will be mainly described. The above-mentioned FIG. 2 is also referred to as appropriate.

FIG. 3 is a diagram showing an example of a structure when a part of the rotor of the rotary electric machine according to the second embodiment is viewed in the circumferential direction. Since the structure when a part of the rotor is viewed in the axial direction can be easily understood from FIG. 2 described above, the illustration of the structure is omitted.

In the present embodiment, among the coil end portions of the lower coil piece 2, the range extending in the inner diameter direction of the rotor core 1 and the direction extending closer to the coil end portion of the upper coil piece 3 from the inner diameter direction are extended. The first portion corresponding to the range is formed by a single member 2-b.

Similarly, in the coil end portion of the upper coil piece 3, the range extending in the inner diameter direction of the rotor core 1 and the range extending in the direction closer to the coil end portion of the lower coil piece 2 from the inner diameter direction. The corresponding second portion is formed of a single member 3-b.

Specifically, the members 2-b, the member 3-b, the member 2-c, the member 3-c, and the member 5 are members 2 in a range extending in the rotor axis direction of the lower coil piece 2, respectively. -A and the member 3-a in the range extending in the rotor axis direction of the upper coil piece 3 are manufactured separately. All are members having electrical conductivity.

The members 2-b and 3-b may be made of a material different from the members 2-a and 3-a. For example, by making the members 2-b and 3-b from a material having a small specific gravity and excellent electrical conductivity, the centrifugal force acting on the coil end portion during operation can be reduced.

When assembling the rotor, the end of the member 2-b and the end of the member 2-a are electrically connected by the electrically conductive member 2-c. Similarly, the end of the member 3-b and the end of the member 3-a are electrically connected by the electrically conductive member 3-c. Brazing or the like may be applied to these connections.

The electrical connection between the end of the member 2-b and the end of the member 3-b by the member 5 may be performed before or after the assembly. Further, joining by brazing or the like may be applied to this connection.

According to the second embodiment, the shape of each coil piece is simplified, and the rotor coil can be easily manufactured. Further, since the portion of the coil end portion on the inner diameter side of the rotor can be manufactured of a material having a small specific gravity and excellent electrical conductivity, the centrifugal force acting on the coil end portion during operation can be reduced.

(Third Embodiment)
Next, a third embodiment will be described with reference to FIGS. 4 and 5. The elements common to the first and second embodiments are designated by the same reference numerals, and duplicate description will be omitted. In the following, the parts different from the first and second embodiments will be mainly described.

FIG. 4 is a diagram showing an example of a structure when a part of the rotor of the rotary electric machine according to the third embodiment is viewed in the circumferential direction. Further, FIG. 5 is a diagram showing an example of a structure when a part of the rotor of the rotary electric machine according to the same embodiment is viewed in the axial direction.

In the present embodiment, (1) of the coil end portion of the lower coil piece 2, the range extending in the inner diameter direction of the rotor core 1 and the direction of turning from the inner diameter direction toward the coil end portion of the upper coil piece 3 Of the first part corresponding to the extending range and (2) the coil end portion of the upper coil piece 3, the range extending in the inner diameter direction of the rotor core 1 and the coil end of the lower coil piece 2 from the inner diameter direction. A single member is a second portion corresponding to a range that extends in a direction closer to the portion, and (3) a third portion that electrically connects the first portion and the second portion. It is formed as a unit at 23.

Specifically, the member 23, the member 2-c, and the member 3-c are the members 2-a in the range extending in the rotor axis direction of the lower coil piece 2, and the upper coil piece 3, respectively. It is manufactured separately from the member 3-a in the range extending in the rotor axis direction. All are members having electrical conductivity.

The member 23 may be made of a material different from the members 2-a and 3-a. For example, by making the member 23 from a material having a small specific gravity and excellent electrical conductivity, the centrifugal force acting on the coil end portion during operation can be reduced.

When assembling the rotor, one end of the member 23 and the end of the member 2-a are electrically connected by a member 2-c having electrical conductivity. Similarly, the other end of the member 23 and the end of the member 3-a are electrically connected by a member 3-c having electrical conductivity. Brazing or the like may be applied to these connections.

According to the third embodiment, since the first portion, the second portion, and the third portion described above are integrally manufactured by the member 23, the number of parts, brazing, and the like are different from those of the second embodiment. The number of joints can be reduced. Further, since the portion of the coil end portion on the inner diameter side of the rotor can be manufactured of a material having a small specific gravity and excellent electrical conductivity, the centrifugal force acting on the coil end portion during operation can be reduced.

(Fourth Embodiment)
Next, a fourth embodiment will be described with reference to FIG. The elements common to the first embodiment are designated by the same reference numerals, and duplicate description will be omitted. Hereinafter, the parts different from the first embodiment will be mainly described.

FIG. 6 is a diagram showing an example of a structure when a part of the rotor of the rotary electric machine according to the fourth embodiment is viewed in the circumferential direction. Since the structure when a part of the rotor is viewed in the axial direction can be easily understood from FIG. 2 described above, the illustration of the structure is omitted.

In the present embodiment, the transmitter 7 transmits the centrifugal force acting on the coil end portions of the lower coil piece 2 and the upper coil piece 3 to the support structure 6 such as a chassis pre-installed on the rotor. It is attached to both a part of the end portion (a part on the inner diameter side of the rotor) and a part of the support structure 6. As a result, the coil end portion is held by the rigidity of the support structure 6.

The flow of the refrigerant may be promoted by providing the support structure 6 with an appropriate opening through which the refrigerant can pass. Further, when the refrigerant flows excessively, the passage of the refrigerant is suppressed and the wind damage at the coil end portion is reduced by providing a portion that causes ventilation resistance on the inner diameter side of the support structure 6. May be good.

According to the fourth embodiment, by installing the transmitter 7, the rotor inner diameter side of each coil end portion of the lower coil piece 2 and the upper coil piece 3 can be stably held by the rigidity of the support structure 6. can. Further, by appropriately processing the support structure 6, it is possible to reduce the wind damage at the coil end portions of the lower coil piece 2 and the upper coil piece 3 and to promote the flow of the refrigerant.

(Fifth Embodiment)
Next, a fifth embodiment will be described with reference to FIG. 7. The elements common to the first embodiment are designated by the same reference numerals, and duplicate description will be omitted. Hereinafter, the parts different from the first embodiment will be mainly described.

FIG. 7 is a diagram showing an example of a structure when a part of the rotor of the rotary electric machine according to the fifth embodiment is viewed in the axial direction. Since the structure when a part of the rotor is viewed in the circumferential direction can be easily understood from FIG. 1 described above, the illustration of the structure is omitted.

In the present embodiment, the coil end portions of the lower coil piece 2 and the upper coil piece 3 extending outward from the axial core end of the rotor core 1 extend in the axial direction of the rotor core 1. , When turning in the inner diameter direction, the position is configured to move in the circumferential direction through the crossing portions 2-d and 3-d.

According to the fifth embodiment, when it is difficult to secure the dimensions between the coil pieces on the inner diameter side, such as when the diameter of the rotor core 1 is small or the number of coil pieces is large, the crossing portions 2-d, 3 By moving the position in the circumferential direction with −d, the dimensional constraint in the radial direction can be relaxed.

As described in detail above, according to each embodiment, there is no problem in cooling the coil end portion, and the dimension of the coil end portion in the rotor axial direction can be reduced.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Rotor iron core, 2 ... Lower coil, 3 ... Upper coil, 4 ... Slot wedge, 5 ... Upper and lower coil connection, 6 ... Support structure, 7 ... Transmitter.

Claims (14)

A rotor core in which a plurality of slots extending in the rotor axis direction are provided apart in the circumferential direction on the outer diameter side, and a rotor coil in which a lower coil piece and an upper coil piece are arranged in each slot are provided. It is a rotor of a rotating electric machine
The lower coil piece arranged in one slot and the upper coil piece arranged in another slot each have a coil end portion extending outward from the axial core end of the rotor core, and each of them has a coil end portion extending outward. The coil ends are configured to be electrically connected to each other.
Each coil end portion of the lower coil piece and the upper coil piece has a portion in which the extending direction is directed from the axial direction of the rotor core to the inner diameter direction, and the respective coil end portions from the inner diameter direction. It has parts that turn closer to each other,
Rotor of rotating electric machine. The ends of the portions where the coil ends of the lower coil piece and the upper coil piece extend in a direction closer to each other are electrically connected to each other by a member having electrical conductivity.
The rotor of the rotary electric machine according to claim 1. The second coil end portion of the lower coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the upper coil piece. Part 1 is formed of a single member,
The second coil end portion of the upper coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the lower coil piece. Part 2 is made up of a single member,
The rotor of a rotary electric machine according to claim 1 or 2. The member forming the first portion and the member forming the second portion are made of a material different from the members in the range extending in the rotor axial direction of the lower coil piece and the upper coil piece, respectively. Has been
The rotor of the rotary electric machine according to claim 3. The second coil end portion of the lower coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the upper coil piece. Part 1 and
The second coil end portion of the upper coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the lower coil piece. Part 2 and
The third portion that electrically connects the first portion and the second portion is
Formed as a single member,
The rotor of the rotary electric machine according to claim 1. A transmitter that transmits centrifugal force acting on the coil end portions of the lower coil piece and the upper coil piece to the support structure provided on the rotor is a part of the coil end portion and one of the structures. Attached to both parts,
The rotor of the rotary electric machine according to claim 1. The coil end portions of the lower coil piece and the upper coil piece move in the circumferential direction through the cross section when the extending direction is changed from the axial direction of the rotor core to the inner diameter direction. It is configured,
The rotor of the rotary electric machine according to claim 1. It includes a rotor core in which a plurality of slots extending in the rotor axis direction are provided apart from each other in the circumferential direction on the outer diameter side, and a rotor coil in which a lower coil piece and an upper coil piece are arranged in each slot. , A method of manufacturing a rotor for a rotating electric machine,
The lower coil piece arranged in one slot and the upper coil piece arranged in another slot each have a coil end portion extending outward from the axial core end of the rotor core, and each of them has a coil end portion extending outward. Including making the rotor coils so that the coil ends are electrically connected to each other.
Each coil end portion of the lower coil piece and the upper coil piece has a portion in which the extending direction is directed from the axial direction of the rotor core to the inner diameter direction, and the respective coil end portions from the inner diameter direction. It has parts that turn closer to each other,
A method for manufacturing a rotor for a rotating electric machine. This includes electrically connecting the ends of the portions of the lower coil piece and the upper coil pieces extending in a direction closer to each other by a member having electrical conductivity.
The method for manufacturing a rotor of a rotary electric machine according to claim 8. The second coil end portion of the lower coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the upper coil piece. Part 1 is formed by a single member,
The second coil end portion of the upper coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the lower coil piece. Part 2 is formed by a single member,
The end of the member forming the first portion and the end of the member in the range extending in the rotor axis direction of the lower coil piece are electrically connected.
This includes electrically connecting the end portion of the member forming the second portion and the end portion of the member in the range extending in the rotor axis direction of the upper coil piece.
The method for manufacturing a rotor of a rotary electric machine according to claim 8 or 9. The member forming the first portion and the member forming the second portion are made of a material different from the members in the range extending in the rotor axial direction of the lower coil piece and the upper coil piece, respectively. Including doing,
The method for manufacturing a rotor of a rotary electric machine according to claim 10. The second coil end portion of the lower coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the upper coil piece. Part 1 and
The second coil end portion of the upper coil piece corresponds to a range extending in the inner diameter direction of the rotor core and a range extending from the inner diameter direction in a direction closer to the coil end portion of the lower coil piece. Part 2 and
A third portion that electrically connects the first portion and the second portion is
Formed as a single member,
One end of the member is electrically connected to the end of the member in a range extending in the rotor axis direction of the lower coil piece.
This includes electrically connecting the other end of the member to the end of the member in a range extending in the rotor axis direction of the upper coil piece.
The method for manufacturing a rotor of a rotary electric machine according to claim 8. A transmitter that transmits centrifugal force acting on the coil end portions of the lower coil piece and the upper coil piece to the support structure provided on the rotor is transmitted to a part of the coil end portion and one of the structures. Including attaching to both parts,
The method for manufacturing a rotor of a rotary electric machine according to claim 8. The coil ends of the lower coil piece and the upper coil piece are moved in the circumferential direction through the cross section when the extending direction is changed from the axial direction of the rotor core to the inner diameter direction. Including configuring,
The method for manufacturing a rotor of a rotary electric machine according to claim 8.

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