JP5628562B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a rotating electrical machine stator applied to a turbine generator and the like, and more particularly to a rotating electrical machine stator for reducing loss due to an eddy current loop passing through a core bolt.

  FIG. 6 is a diagram illustrating a basic configuration of a conventional stator of a rotating electric machine. A conventional stator of a rotating electric machine includes a main iron core (stator iron core) 1, a stator coil 2, a finger plate 3, a clamper 4, a shield core 5, a shield presser 6, and a core bolt 7.

  Next, each component will be described. The main iron core 1 is configured as a substantially cylindrical laminated iron core by laminating electromagnetic steel sheets in the axial direction, and has a plurality of open slots. The stator coil 2 is wound around a slot of the main iron core 1 and has a stator coil end 2a. The finger plate 3 is installed on the end surface in the axial direction of the main iron core 1. The clamper 4 is installed on the end surface in the axial direction of the outer side of the finger plate 3, is made of a magnetic metal that fastens the main iron core 1 through the finger plate 3, and has a back clamper 4a.

  The shield core 5 is installed on the end surface in the axial direction of the outer side of the clamper 4 and has a structure in which electromagnetic steel plates are laminated, reducing leakage magnetic flux linked to the clamper and reducing eddy current loss generated in the clamper. It is installed for the purpose of reducing. The shield retainer 6 plays a role of fixing the shield core 5. Furthermore, the core bolt 7 plays a role of penetrating and fixing the main iron core 1, the finger plate 3, the clamper 4, the shield core 5 and the shield presser 6 on the outer diameter side.

  In a large-sized rotating electrical machine such as a turbine generator, the magnetic flux density of the back clamper 4a or the shield core 5 is increased due to the influence of leakage magnetic flux generated by the stator coil 2 on the stator coil end 2a (see “ (Refer to the arrow at the end-back interlinkage magnetic flux). In particular, during the copper loss test, the magnetic flux interlinked with the main iron core 1 is canceled because the magnetic flux produced by the stator and the magnetic flux produced by the rotor are in opposite directions, but the leakage magnetic flux generated at the end is The influence of the rotor magnetic flux is reduced, and a large interlinkage magnetic flux can be obtained due to the stator leakage magnetic flux.

  For this reason, in the clamper 4 and the shield core 5, as shown in FIG. 6, the magnetic flux may leak to the outer diameter side (hereinafter referred to as the back portion) of the stator. When the back leakage magnetic flux is linked between the core bolts 7 penetrating the core back portion, an induced voltage is generated in the core bolt 7 and an eddy current is generated.

  7 and 8 are explanatory views showing an eddy current loop generated in a stator of a conventional rotating electric machine. Conventionally, since it was not assumed that the magnetic flux generated in the rotating machine leaks to the back of the core, the conductive loop is designed between the core bolts 7. That is, the end of the core bolt 7 is in metal contact with a conductive member such as the shield retainer 6, and the body of the core bolt 7 is welded to a metal member (hereinafter referred to as a support member 8) serving as a structural material. It has a structure.

  Thereby, as shown in FIG. 7, an eddy current is generated in a loop of “core bolt 7 → shield retainer 6 → core bolt 7 → support member 8”. Further, even when the shield retainer 6 is divided in the circumferential direction, if there is no insulation between the shield retainers 6, an eddy current loop is generated in a route as shown in FIG. This is often seen in the case where the clamper 4 is present behind the shield core, and it is assumed that the back clamper 4a and the shield presser 6 are in metal contact.

  The loss due to the eddy current loop passing through the core bolt 7 generated due to the above-described factors has been a problem in promoting high efficiency of the rotating electrical machine. On the other hand, there is a technique for reducing eddy current generated in the shield presser 6 by the axial magnetic flux (see, for example, Patent Document 1).

JP 2008-43080 A

  However, the prior art has the following problems. In the prior art such as Patent Document 1, no consideration is given to the end core back leakage magnetic flux. Furthermore, if the core bolt 7 is in metal contact with the main iron core 1 of the stator, an eddy current will flow between the core bolt 7 and the main iron core 1, leaving a defect of overheating between the main iron core 1 and the core bolt 7. Turned out to be.

  Furthermore, it has been found that eddy currents caused by metal contact also flow between the shield presser 6 and the back clamper 4a, and between the core bolt 7 and the shield presser 6, which can similarly cause a problem of leaving an overheat mark.

  The present invention has been made in order to solve the above-described problems, and is capable of reducing loss due to an eddy current loop and reducing defects such as overheating marks, and fixing a highly efficient and highly reliable rotating electrical machine. The purpose is to get a child.

A stator of a rotating electrical machine according to the present invention is composed of a substantially cylindrical laminated core, a stator core having a slot for storing a stator coil inside, and a clamper that holds the stator core in the axial direction. Rotation equipped with a shield core installed on the axial end surface of the clamper outside the machine, a shield presser that holds the shield core in the axial direction, a stator core, a clamper, a shield core, and a core bolt that penetrates and fixes the shield presser In order to suppress the generation of eddy current due to the magnetic flux penetrating the shield core in the radial direction in the stator of the electric machine, an electrical connection is made between the back clamper provided at the back of the clamper and the shield presser divided in the circumferential direction. A first electrically insulating layer that electrically insulates.

  According to the stator of the rotating electric machine according to the present invention, by further including an electrical insulating layer that interrupts the path of the eddy current loop, loss due to the eddy current loop can be reduced, and problems such as overheating marks can be reduced. A reduced, highly efficient and highly reliable stator of a rotating electrical machine can be obtained.

It is a figure which shows the basic composition of the stator of the rotary electric machine in Embodiment 1 of this invention. It is a figure which shows the specific example of the electrical insulation layer applied to the stator of the rotary electric machine in Embodiment 1 of this invention. It is a figure which shows another specific example of the electrical insulation layer applied to the stator of the rotary electric machine in Embodiment 1 of this invention. It is a figure which shows the basic composition of the stator of the rotary electric machine in Embodiment 2 of this invention. It is a figure which shows the specific example of the electrical insulation layer applied to the stator of the rotary electric machine in Embodiment 2 of this invention. It is a figure which shows the basic composition of the stator of the conventional rotary electric machine. It is explanatory drawing which showed the eddy current loop which generate | occur | produces in the stator of the conventional rotary electric machine. It is explanatory drawing which showed the eddy current loop which generate | occur | produces in the stator of the conventional rotary electric machine.

  Hereinafter, preferred embodiments of a stator of a rotating electric machine according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a diagram showing a basic configuration of a stator of a rotating electrical machine according to Embodiment 1 of the present invention. The stator of the rotating electrical machine according to the first embodiment includes a main iron core (stator core) 1, a stator coil 2, a finger plate 3, a clamper 4, a shield core 5, a shield presser 6, a core bolt 7, and an electrical insulating layer. 10.

  The configuration shown in FIG. 1 in the first embodiment is different from the configuration in FIG. 6 in the prior art in that an electrical insulating layer 10 is provided between the shield presser 6 and the back clamper 4a. Is different. Therefore, this different configuration will be mainly described below.

  As shown in FIG. 1, the electrical insulating layer 10 serves to insulate the shield retainer 6 from conductors connecting the shield retainers 6 such as the back clamper 4a. The eddy current loop as shown in FIG. 8 can be cut by the function of the electrical insulating layer 10. As a result, loss due to eddy current loops can be reduced, defects such as overheating marks can be reduced, and a highly efficient and highly reliable rotating electrical machine can be realized.

  FIG. 2 is a diagram showing a specific example of the electrical insulating layer 10 applied to the stator of the rotating electrical machine according to the first embodiment of the present invention. For example, as shown in FIG. 2, in order to provide the electrical insulating layer 10 between the back clamper 4a and the shield presser 6, it is considered that the electrical insulating layer 10a is provided on the entire circumference of the back clamper 4a. It is done.

  Moreover, FIG. 3 is a figure which shows another specific example of the electrical insulating layer 10 applied to the stator of the rotary electric machine in Embodiment 1 of this invention. For example, as shown in FIG. 3, in order to provide the electrical insulating layer 10 between the back clamper 4a and the shield presser 6, it is considered that the electrical insulating layer 10b is partially provided on the back clamper 4a. It is done. As shown in FIG. 3, the electrical insulating layer 10b can play a role of cutting an eddy current loop even if it is not necessarily all around the back clamper 4a.

  As described above, the first embodiment has a structure in which an electrical insulating layer is provided between the back clamper and the shield presser. As a result, the eddy current loop of the path “core bolt → shield holder → adjacent shield holder → core bolt → support member or main iron core” can be cut. As a result, it is possible to obtain a stator of a rotating electrical machine that reduces loss due to an eddy current loop, reduces defects such as overheating marks, and realizes a highly efficient and highly reliable rotating electrical machine.

Embodiment 2. FIG.
In the first embodiment, the electrical insulating layer 10 for cutting the eddy current loop generated in the route shown in FIG. 8 has been described. On the other hand, in the second embodiment, an electrical insulating layer 11 for cutting an eddy current loop generated in the route shown in FIG. 7 will be described.

  FIG. 4 is a diagram showing a basic configuration of the stator of the rotating electrical machine according to the second embodiment of the present invention. The stator of the rotating electrical machine according to the second embodiment includes a main iron core (stator core) 1, a stator coil 2, a finger plate 3, a clamper 4, a shield core 5, a shield presser 6, a core bolt 7, and an electrical insulating layer. 11.

  The configuration shown in FIG. 4 in the second embodiment is that an electrical insulating layer 11 is provided between the core bolt 7 and the shield presser 6 as compared with the configuration of FIG. 6 in the prior art. Is different. Therefore, this different configuration will be mainly described below.

  As shown in FIG. 4, the electrical insulating layer 11 serves to insulate the shield retainer 6 from the core bolt 7. The eddy current loop as shown in FIG. 7 can be cut by the function of the electrical insulating layer 11. As a result, loss due to eddy current loops can be reduced, defects such as overheating marks can be reduced, and a highly efficient and highly reliable rotating electrical machine can be realized.

  FIG. 5 is a diagram showing a specific example of the electrical insulating layer 11 applied to the stator of the rotating electrical machine according to the second embodiment of the present invention. For example, as shown in FIG. 5, the electrical insulating layer 11 between the core bolt 7 and the shield presser 6 has all the core bolts 7 in a case where a plurality of core bolts 7 are fixed to one shield presser 6. There is no need to insulate.

  As shown in FIG. 5, by providing the electrical insulating layer 11 with respect to the core bolts 7 other than one of the plurality of core bolts 7 penetrating through one shield presser 6, all the core bolts 7 are not insulated. However, it is possible to prevent the generation of an eddy current loop.

  In FIG. 5, the insulating insulating layer 10 described in the first embodiment is also illustrated. By using the electric insulating layers 10 and 11 together, the rotating electric machine is more efficient and highly reliable. A stator for a rotating electrical machine that achieves the above can be obtained.

  As described above, the second embodiment has a structure in which an electrical insulating layer is provided between the core bolt and the shield presser. Thereby, the eddy current loop of the path of “core bolt → shield holding or conductive shield → core bolt → support member or main iron core” can be cut. As a result, it is possible to obtain a stator of a rotating electrical machine that reduces loss due to an eddy current loop, reduces defects such as overheating marks, and realizes a highly efficient and highly reliable rotating electrical machine.

  1 main iron core, 2 stator coil, 2a stator coil end, 3 finger plate, 4 clamper, 4a back clamper, 5 shield core, 6 shield presser, 7 core bolt, 10, 10a, 10b electrical insulation layer (first Electrical insulation layer), 11 Electrical insulation layer (second electrical insulation layer).

Claims (3)

A stator core composed of a substantially cylindrical laminated core, and a slot for storing a stator coil on the inside;
A clamper for pressing the stator core from the axial direction;
A shield core installed on the outer axial end face of the clamper;
A shield presser that holds the shield core in the axial direction;
In a stator of a rotating electrical machine comprising: the stator core, the clamper, the shield core, and a core bolt that penetrates and fixes the shield presser.
In order to suppress the generation of eddy current due to magnetic flux penetrating the shield core in the radial direction, the back clamper provided on the back of the clamper is electrically insulated from the shield press divided in the circumferential direction. A stator for a rotating electrical machine, further comprising a first electrical insulating layer. The stator of the rotating electrical machine according to claim 1,
A stator for a rotating electrical machine, further comprising a second electrical insulating layer that electrically insulates between the core bolt and the shield retainer. The stator of the rotating electrical machine according to claim 2,
In the case where a plurality of core bolts pass through the individual shield holders divided in the circumferential direction, all but the one of the plurality of core bolts passing through one shield holder are all the second electrical insulation. A stator for a rotating electric machine, wherein a layer is used to electrically insulate between the core bolt and the shield retainer.

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