JP2008054405A - Turbine generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure of stator coil ends of a turbine generator that causes no deterioration in durability by heat accumulation and that can regulate the deterioration of rigidity of the stator coil ends after a long-time operation. <P>SOLUTION: The turbine generator of this invention is equipped with a rotor for generating a rotating magnetic field and a stator provided at the outside periphery of this rotor. The stator comprises a slotted stator core which keeps stator coils arranged in the slots. The stator coils project axially from the stator core, have the stator coil ends that are rolled, and have an outside peripheral side cut-head conic shell-like member made of an insulation material formed on at least a part of the outside circumferential side of the stator coil ends. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a turbine generator.

  Generally, a turbine generator includes a rotor that generates a rotating magnetic field, and a stator that is installed on the outer peripheral side of the rotor and has a stator core that is formed with a slot and a stator coil that is disposed in the slot. An induced voltage is generated in the stator coil of the stator core by the rotating magnetic field of the rotor, and current flows.

  The stator coil has a straight portion arranged in a slot of the stator core, but the end of the stator coil protrudes from the stator core in the axial direction of the turbine generator and is wound back.

  Since the stator coil ends protrude from the stator core, a static electromagnetic force and an electromagnetic force that fluctuates at a frequency about twice the power supply frequency act during operation, and are excited by these electromagnetic forces. The ring vibration mode may cause deformation.

  With respect to such a problem, Patent Document 1 discloses a structure that secures the rigidity of the end portion of the stator coil having a substantially truncated cone shape, and is fixed at several locations on the outer periphery of the end portion of the stator coil. It has a bind ring that suppresses the radial movement of the end of the child coil, and a bind ring support plate that is coupled to the holding plate of the stator core by a sliding coupling mechanism that is restrained in the radial direction, and these are bound to each other by a binding member Such a structure is disclosed.

  Further, in Patent Document 2, a plurality of bindings that are installed on the outer peripheral side of the stator coil end portion and fix the stator coil end portion with a band made of a resin-impregnated material or the like, and a plurality of bindings are mechanically arranged. A plurality of brackets installed on the outer peripheral side are fixed to the stator core so that a gap (gap) is formed between the plurality of bindings and a coil support portion having at least two binding rings connected to A structure is disclosed.

  In Patent Document 3, an insulating ring is installed on the outer peripheral side of the stator coil end and a holding ring is installed on the inner peripheral side, and the modified aliphatic polyamine is cured on epoxy resin around the stator coil end. A structure in which an epoxy compound formed of a composition mixed as an agent is press-filled and cured, and these are integrated is disclosed.

  Further, Patent Document 4 discloses a stator in which a turn-back portion protruding from a slot of a stator core is housed and disposed in a cone member having a plurality of slots on the inner peripheral side, and a cone-shaped pressing ring member is disposed on the inside thereof. A coil end support structure is disclosed.

JP-A-5-137287 JP-A-8-065938 JP 2002-027697 A JP 2004-129324 A

  In the conventional technology, after the long-term operation, the binding member is loosened and the rigidity of the end of the stator coil is lowered, and the natural frequency of the annular vibration mode may coincide with the frequency of the fluctuating electromagnetic force, resulting in resonance. There is. There is also concern that the number of parts and the number of manufacturing processes are large.

  Also, the heat generated by the energy loss of the current flowing through the stator coil tends to accumulate around the stator coil, and when a high temperature of 155 ° C. or higher occurs, the insulator and epoxy wound around the stator coil The compound may deteriorate and the insulation function and durability may decrease. Furthermore, partial repair / replacement such as breakage of the stator coil or deterioration of the insulator wound around the stator coil requires removal of the epoxy compound.

  In addition, it is difficult to manufacture and assemble, and there may be a problem in manufacturing technology and manufacturing cost.

  Accordingly, the present invention provides a support structure for a stator coil end portion of a turbine generator that is capable of adjusting a decrease in rigidity of a stator coil end portion after a long-term operation without deterioration in durability due to heat storage. It is in.

  A turbine generator according to the present invention includes a rotor that generates a rotating magnetic field and a stator that is installed on the outer peripheral side of the rotor, and the stator is disposed in a stator core and a slot in which a slot is formed. A stator coil, the stator coil protruding in the axial direction from the stator core, and having a stator coil end that is wound back, and is formed on at least a part of the outer peripheral side of the stator coil end. And an outer peripheral side truncated conical shell member made of an insulating material.

  Moreover, it has a stator core pressing plate that holds the stator core and has a protruding portion that protrudes in the axial direction. Moreover, it has the inner peripheral side truncated cone-shell-shaped member made from an insulating material formed in at least one part of the inner peripheral side of a stator coil edge part. Moreover, it has the shield board formed along the shape of the protrusion part of a stator iron core pressing board. Moreover, it has the spacer made from an insulating material formed between the stator coil end parts wound back.

  Moreover, it has a slip coupling mechanism formed between the protrusion part of a stator iron core pressing plate, and an outer peripheral side truncated cone-shell-shaped member. When the shield plate is formed, it has an inner peripheral side slip coupling mechanism formed between the shield plate and the outer peripheral side truncated conical shell-shaped member.

  Moreover, it has the outer peripheral side elastic sheet made from an insulating material formed between an outer peripheral side truncated conical shell-shaped member and a stator coil edge part. When the inner peripheral side truncated conical shell-shaped member is formed, the inner peripheral side elastic sheet made of an insulating material formed between the inner peripheral side truncated conical shell-shaped member and the stator coil end portion Have

  In addition, a tension adjusting mechanism is provided for binding the outer peripheral side truncated conical shell-shaped member and the stator coil end so that the tension can be adjusted. In the case where the inner peripheral side truncated conical shell member is formed, a tension adjusting mechanism for binding the outer peripheral side truncated conical shell member and the inner peripheral side truncated conical shell member so as to adjust the tension is provided.

  According to the present invention, it is possible to provide a support structure for a stator coil end portion of a turbine generator that is capable of adjusting a decrease in rigidity of a stator coil end portion after a long-term operation without deterioration in durability due to heat storage. .

  Hereinafter, the support structure of the stator coil end portion of the turbine generator in this embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is an embodiment relating to the present embodiment, and is a cross-sectional view of the upper half of a support structure for a stator coil end of a turbine generator, cut in the axial direction.

  The turbine generator includes a rotor that generates a rotating magnetic field and a stator that is installed on the outer peripheral side of the rotor. The stator has a stator core 1 in which a slot is formed and a stator coil disposed in the slot. The stator coil has a stator coil end 2 that protrudes axially from the stator core 1 and is wound back.

  Furthermore, the stator core pressing plate 3 that holds the stator core 1 and has a protruding portion 31 protruding in the axial direction, and the outer peripheral side made of an insulating material formed on at least a part of the outer peripheral side of the stator coil end 2 A truncated cone-shaped member 4, an inner circumferential truncated cone-shaped member 5 made of an insulating material formed on at least a part of the inner circumferential side of the stator coil end 2, and a stator core retainer plate 3 The shield plate 6 formed along the shape of the projecting portion 31, the inner peripheral side sliding coupling mechanism 7 formed between the shield plate 6 and the outer peripheral truncated cone-shell member 4, and the stator to be rolled back An insulating material spacer 8 formed between the coil ends 2, an outer peripheral elastic sheet 9 made of an insulating material formed between the outer peripheral truncated cone-shaped member 4 and the stator coil end 2; , Made of an insulating material formed between the inner peripheral side truncated conical shell member 5 and the stator coil end 2 Having an inner peripheral side elastic sheet 10, the.

  An outer spacing member 11 that fixes the stator core 1 is formed between the stator core 1 and the stator core pressing plate 3. In addition, the stator core pressing plate 3 is formed with ribs 12 that reinforce the protruding portions 31.

  Moreover, the axial direction front-end | tip part of the stator coil end part 2 has a structure where the outer peripheral side stator coil end part 21 and the inner peripheral side stator coil end part 22 are electrically connected, A cap 13 is formed.

  Moreover, it has the tension | tensile_strength adjustment mechanism 14 which binds the outer peripheral side truncated cone-shell-like member 4 and the inner peripheral side truncated cone-shell-like member 5 so that tension adjustment is possible.

  Further, a bind member 15 is formed at a portion where the insulating material spacer 8 is installed.

  The stator core 1 is a laminate of silicon steel plates, and the stator coil end 2 is formed of copper. The stator coil end 2 has a structure that is wound back to another slot. That is, after the stator coil protrudes from the stator core 1 in the axial direction, the stator coil is formed obliquely and wound back to another slot.

  The stator core pressing plate 3 is made of an iron-based metal.

  Further, it is formed on at least a part of the outer peripheral side truncated conical shell-shaped member 4 made of an insulating material and the inner peripheral side of the stator coil end 2 formed on at least a part of the outer peripheral side of the stator coil end 2. The inner peripheral side truncated conical shell member 5 made of an insulating material is made of an epoxy resin.

  The shield plate 6 is made of copper. The inner peripheral side slip coupling mechanism 7 is formed of a fluorine resin.

  An outer peripheral side elastic sheet 9 made of an insulating material formed between the outer peripheral side truncated cone-shell member 4 and the stator coil end 2 or an inner peripheral side truncated cone shell member 5 and the stator coil end 2 The inner peripheral elastic sheet 10 made of an insulating material is formed of a silicon-based heat resistant rubber sheet.

  The outer spacing member 11 is made of iron-based metal.

  Moreover, the outer peripheral side stator coil end 21 and the inner peripheral side stator coil end 22 are connected to each other at the tip end in the axial direction of the stator coil end 2 by copper. The cap 13 is formed of an epoxy resin.

  Further, the tension adjusting mechanism 14 for binding the outer peripheral side truncated conical shell-shaped member 4 and the inner peripheral side truncated conical shell-shaped member 5 so as to be capable of adjusting the tension is formed of glass fiber. The binding member 15 is also made of glass fiber.

  In addition, the outer peripheral side truncated conical shell-shaped member 4 made of an insulating material formed on at least a part of the outer peripheral side of the stator coil end portion 2 has a diameter in the tip direction in the axial direction rather than the vicinity of the central portion in the axial direction. It is formed thick in the direction. This is to improve the rigidity.

  Furthermore, the tip end portion of the outer peripheral side truncated conical shell-like member 4 is formed thick on the inner peripheral side, and the thickness thereof is determined between the outer peripheral side truncated conical shell-like member 4 and the stator coil end portion 2. It is formed thinner than the thickness of the outer peripheral side elastic sheet 9 made of an insulating material. That is, a slight gap 16 is formed between the distal end portion of the outer peripheral side truncated conical shell-shaped member 4 formed thick on the inner peripheral side and the outer peripheral side stator coil end portion 21 or the cap 13. This is because the tension adjustment mechanism 14 ensures the degree of freedom of adjustment.

  Moreover, the tension adjustment mechanism 14 is installed in two places, and it has the structure which can adjust tension partially.

  Furthermore, the base part of the outer peripheral side truncated conical shell-shaped member 4 is formed thick on the outer peripheral side, and the thickness of this part is adjusted to be parallel to the shield plate 6. When the shield plate 6 is not formed, the thickness of this portion is adjusted so as to be parallel to the protruding portion 31 of the stator core pressing plate 3.

  According to this embodiment, the rigidity of the support structure of the stator coil end can be secured even after long-term operation and further improved, and the number of parts and the number of manufacturing steps can be greatly reduced.

  Moreover, the turbine generator used for this form is shown in FIG.

  The turbine generator includes a rotor (hereinafter referred to as “rotor”) 101 that generates a rotating magnetic field, a cylindrical stator 102 provided on the outer peripheral side of the rotor 101, and an outer side of the stator 102. A stator frame 103 that holds the stator 102, an end cover 104 that is provided at both ends of the stator 102, attached to the stator frame 103, and a central portion of the end cover 104. The bearing 105 is configured to support the rotor 101.

  The stator 102 includes a stator core 1 formed by stacking thin silicon steel plates, and a plurality of stator coils housed in a plurality of slots formed in the stator core 1. As a result, an induced voltage is generated in the stator coil housed in the slot of the stator core 1, and a current flows.

  The straight portions of these stator coils are housed in the slots of the stator core 1, but the end portions of the stator coil that the stator coils rewind on both ends protrude from the stator core.

  The structure for supporting the end of the stator coil of the turbine generator described in this embodiment can be applied to such a turbine generator.

  FIG. 2 is also an example relating to this embodiment, and is a cross-sectional view of the upper half of the support structure of the stator coil end portion of the turbine generator cut in the axial direction.

  The turbine generator in this embodiment also includes a rotor that generates a rotating magnetic field and a stator that is installed on the outer peripheral side of the rotor. The stator has a stator core 1 in which a slot is formed and a stator coil disposed in the slot. The stator coil has a stator coil end 2 that protrudes axially from the stator core 1 and is wound back.

  The other reference numerals are the same as those shown in FIG.

  The difference between the embodiment shown in FIG. 1 and this embodiment is that, in this embodiment, an inner peripheral side truncated cone-shell member made of an insulating material is formed on at least a part of the inner peripheral side of the stator coil end 2. 5 and the inner peripheral side elastic sheet 10 made of an insulating material formed between the inner peripheral side truncated cone-shell member 5 and the stator coil end 2 is not formed.

  In the case of this embodiment, the tension adjusting mechanism 14 binds the outer peripheral side truncated conical shell-shaped member 4 and the inner peripheral side stator coil end 22.

  Also according to this embodiment, the rigidity of the support structure of the stator coil end can be secured even after long-term operation, and further improved, and the number of parts and the number of manufacturing steps can be greatly reduced.

  The present invention particularly relates to a support structure for a stator coil end of a turbine generator, and is used for a turbine generator used in a power plant.

Sectional drawing cut | disconnected to the axial direction about the upper half of the support structure of the stator coil end part of the turbine generator which shows the 1st Example of this invention. Sectional drawing cut | disconnected in the axial direction about the upper half of the support structure of the stator coil end part of the turbine generator which shows the 2nd Example of this invention. The schematic block diagram of a turbine generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Stator iron core, 2 ... Stator coil edge part, 3 ... Stator iron core holding plate, 4 ... Outer peripheral side truncated conical shell-shaped member, 5 ... Inner peripheral side truncated conical shell-shaped member, 6 ... Shield plate, DESCRIPTION OF SYMBOLS 7 ... Inner peripheral side slip coupling mechanism, 8 ... Insulating material spacer, 9 ... Outer peripheral side elastic sheet, 10 ... Inner peripheral side elastic sheet, 11 ... Outer space member, 12 ... Rib, 13 ... Cap, 14 ... Tension adjusting mechanism 15 Bind members.

Claims (12)

A rotor for generating a rotating magnetic field, and a stator installed on the outer peripheral side of the rotor,
The stator has a stator core in which a slot is formed and a stator coil disposed in the slot;
The stator coil protrudes axially from the stator core and has a stator coil end that is wound back;
A turbine generator comprising an outer peripheral side truncated conical shell member made of an insulating material formed on at least a part of the outer peripheral side of the stator coil end. The turbine generator according to claim 1, wherein
A turbine generator having a stator core pressing plate that holds the stator core and has a protruding portion protruding in the axial direction. The turbine generator according to claim 1, wherein
A turbine generator having an inner peripheral side truncated conical shell-shaped member made of an insulating material formed on at least part of the inner peripheral side of the stator coil end. The turbine generator according to claim 2, wherein
A turbine generator having a shield plate formed along the shape of the protruding portion of the stator core pressing plate. The turbine generator according to claim 1, wherein
A turbine generator having a spacer made of an insulating material formed between end portions of the stator coil to be wound back. The turbine generator according to claim 1, wherein
A turbine generator comprising a sliding coupling mechanism formed between a protruding portion of the stator core pressing plate and the outer peripheral side truncated conical shell member. The turbine generator according to claim 4, wherein
A turbine generator having an inner peripheral side slip coupling mechanism formed between the shield plate and the outer peripheral side truncated conical shell-shaped member. The turbine generator according to claim 1, wherein
A turbine generator comprising an outer peripheral side elastic sheet made of an insulating material formed between the outer peripheral side truncated conical shell-shaped member and the stator coil end. The turbine generator according to claim 3,
A turbine generator comprising: an inner peripheral elastic sheet made of an insulating material formed between the inner peripheral truncated cone-shaped member and the stator coil end. A rotor for generating a rotating magnetic field, and a stator installed on the outer peripheral side of the rotor,
The stator has a stator core in which a slot is formed and a stator coil disposed in the slot;
The stator coil protrudes axially from the stator core and has a stator coil end that is wound back;
A stator core presser plate that holds the stator core and has a protruding portion that protrudes in the axial direction;
An outer peripheral side truncated conical shell-shaped member made of an insulating material formed on at least a part of the outer peripheral side of the stator coil end;
An inner peripheral side truncated conical shell-shaped member made of an insulating material formed on at least a part of the inner peripheral side of the stator coil end;
A shield plate formed along the shape of the protruding portion of the stator core pressing plate;
An inner peripheral side slip coupling mechanism formed between the shield plate and the outer peripheral truncated cone-shell member;
A spacer made of an insulating material formed between the ends of the stator coil to be wound;
An outer peripheral side elastic sheet made of an insulating material formed between the outer peripheral side truncated conical shell-shaped member and the stator coil end; and
An inner peripheral elastic sheet made of an insulating material formed between the inner peripheral truncated cone-shell member and the stator coil end;
Turbine generator with The turbine generator according to claim 1, wherein
A turbine generator, comprising: a tension adjusting mechanism that binds the outer peripheral side truncated conical shell-shaped member and the stator coil end so as to allow tension adjustment. The turbine generator according to claim 3,
A turbine generator comprising a tension adjusting mechanism for binding the outer peripheral side truncated conical shell-shaped member and the inner peripheral side truncated conical shell-shaped member so that the tension can be adjusted.

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