JP2011101569A - Rotor of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a rotary electric machine which prevents an interlayer insulating plate from being peeled off from a field wiring or ruptured by reducing a stress generated at the interlayer insulating plate, and eliminates interlayer short circuit even if the interlayer insulating plate is ruptured. <P>SOLUTION: In the rotor of the rotary electric machine in which the field winding and the interlayer insulating plate are alternatively inserted into a plurality of slots provided at a rotor core via a slot insulator, and which is configured such that they are pressed by a wedge via the insulator below the wedge, at least one place in the axial direction of the interlayer insulating plate 5A arranged between respective layers of the field winding 4 is divided in two, a stepped joint 5A-1 is constituted by overlapping a stepped part of at least one step formed by notching the ends of these respective interlayer insulating plates alternatively so as to have the same thickness as that of the interlayer insulating plate of the other portion, one surface including the stepped joint 5A-1 of the interlayer insulating plate divided into two is adhered to the field winding 4 by an adhesive as an adhesive surface, the interlayer insulating plates of the stepped joint are not adhered with each other and the other surface of the interlayer insulating plate is not adhered to the field winding 4 of the other layer for use as the sliding surface. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor of a rotating electrical machine having a structure capable of preventing peeling and breakage of an interlayer insulating plate of a field winding housed in a slot, for example, in a rotor of a turbine generator.

  In general, a rotor of a turbine generator has a slot insulation for ground insulation in a plurality of slots 2 processed by leaving a magnetic pole in a rotor core 1 forged as shown in FIGS. 5 (a) and 5 (b). A structure is adopted in which the field windings 4 and the interlayer insulating plates 5 composed of glass fiber laminates are alternately inserted through the objects 3 and finally pressed by the wedges 7 via the sub-wedge insulating blocks 6.

  Thus, in the structure in which the field winding 4 and the interlayer insulating plate 5 are housed in the slot 2 of the rotor core 1, the temperature change of the field winding accompanying the start and stop of the rotating electrical machine is caused by the field winding. It differs depending on each layer and the axial position in the same layer.

  Therefore, since the thermal expansion and contraction with respect to the temperature change of the field winding are different between the field winding and the interlayer insulating plate, a tensile or compressive stress acts on the interlayer insulating plate even if the temperature change occurs. Further, the temperature change in each layer of the field winding causes a difference in thermal expansion and contraction, and an interlayer insulating plate sandwiched between the field windings also generates tensile and compressive stress due to friction.

  Even under the influence of the deflection of the rotor shaft during operation, a tensile or compressive stress is generated in the interlayer insulating plate due to the difference in the deflection amount of each layer of the field winding.

  The tensile stress generated by various factors as described above is generated when the interlayer insulating plate made of the glass fiber laminate is peeled off from the field winding, and further, the interlayer insulating plate is peeled off from the field winding. It is known that stress concentration in an interlayer insulating plate breaks the interlayer insulating plate and leads to an interlayer short circuit.

  In order to prevent such an interlayer short circuit, only one surface of the interlayer insulating plate is bonded to the field winding with a synthetic resin adhesive to prevent positional displacement of the interlayer insulating plate, and the other surface is in contact with the field winding. A structure that prevents the generation of stress in the interlayer insulating plate by using the surface as a sliding surface is widely adopted.

  In addition, a configuration is also considered in which an elastic adhesive is applied on both surfaces of the interlayer insulating plate instead of a synthetic resin adhesive to prevent the displacement of the interlayer insulating plate and reduce the stress generated in the interlayer insulating plate. (For example, refer to Patent Document 1).

  In addition, the interlayer insulation plate is bonded to both sides of the field winding, and when the field winding is inserted into the slot of the rotor core, the interlayer insulation plate is doubled. A proposal has also been made to prevent generation of wear powder of field windings by preventing the short circuit between layers by making the overlapping surface of the plates into sliding surfaces (see, for example, Patent Document 2).

  In addition, as a measure to prevent interlayer short circuit, it has also been proposed to prevent interlayer short circuit by applying a ceramic coating with excellent lubrication and wear resistance to the entire circumference of the field winding without using the interlayer insulating plate itself. (For example, refer to Patent Document 1).

JP 2005-20946 A Japanese Patent Publication No. 7-67250

  In the interlayer insulating plate configured as in the former, since the dynamic friction coefficient between the surface of the interlayer insulating plate not coated with the adhesive and the field winding is large, the field winding accompanying start and stop There is a risk that the interlayer insulating plate breaks due to thermal expansion or contraction, resulting in an interlayer short circuit.

  Here, an elastic adhesive is used in place of the synthetic resin adhesive as a measure for preventing breakage as in Patent Document 1, or an interlayer insulating plate is doubled as in Patent Document 2, resulting in an interlayer short circuit. The possibility can be reduced.

  However, elastic adhesives and ceramic coatings applied to prevent breakage are expensive compared to synthetic resin adhesives, and when the interlayer insulation plate is doubled, the field windings are used as rotor cores. It is necessary to affix an interlayer insulating plate on the back surface of the field winding before inserting it into the slot, and the possibility of the interlayer insulating plate shifting when the slot is inserted cannot be wiped off. In addition, it is also troublesome to insert the field winding into the slot carefully so that the interlayer insulating plate is not displaced.

  The present invention has been made in order to solve the above-described problems, and reduces the stress generated in the interlayer insulating plate without increasing the manufacturing cost, so that the interlayer insulating plate is peeled off or broken from the field winding. An object of the present invention is to provide a highly reliable rotor of a rotating electrical machine that can prevent the occurrence of short circuiting and that does not cause a short circuit between layers even when an interlayer insulating plate is broken.

  In order to achieve the above object, the present invention inserts field windings and interlayer insulating plates alternately into a plurality of slots provided in a rotor core through slot insulators, and these are used as insulators under wedges. In a rotor of a rotating electrical machine configured to be pressed by a wedge, at least one portion in the axial direction of the interlayer insulating plate disposed between each layer of the field winding is divided into two, and one of the interlayer insulating plates The thickness of the stepped portion where the end of the other interlayer insulating plate is overlapped and the adjacent field winding are combined to the thickness of the adjacent field winding of the other portion of the interlayer insulating plate A joint portion is formed so as to be the same as the above, and one side including the joint portion of the bisected interlayer insulating plate is bonded to the field winding with an adhesive as an adhesive surface, and the interlayer insulating plate of the joint portion Do not bond the other surfaces of the inter-layer insulation board and the interlayer insulation plate to the field winding of another layer Constitute Te.

  According to the present invention, it is possible to reduce the stress generated in the interlayer insulating plate without increasing the manufacturing cost and prevent the interlayer insulating plate from peeling or breaking from the field winding, and the interlayer insulating plate is broken. Also, there is no short circuit between layers, and it can be made highly reliable.

FIG. 3 is an enlarged side view showing a part of the interlayer insulating plate in the first embodiment of the present invention in the axial direction. The expanded side view similar to FIG. 1 which shows the other structural example in the same embodiment. The expanded side view which shows a part of interlayer insulation board in the 2nd Embodiment of this invention, and cross-sections it to an axial direction. The expanded side view which shows a part of interlayer insulation board in the 3rd Embodiment of this invention, and cross-sections it to an axial direction. (A), (b) is for demonstrating the structural example of the rotor of a rotary electric machine, (a) is a front view of a rotor core, (b) is sectional drawing of a slot part.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is an enlarged side view showing a part of an interlayer insulating plate according to the first embodiment of the present invention in an axial section, and the configuration of the entire rotor according to the present invention is the same as FIG. Now, description will be made with reference to FIG.

  In the first embodiment, as shown in FIGS. 5 (a) and 5 (b), a plurality of slots 2 processed while leaving magnetic poles in the rotor iron core 1 are connected to the ground via slot insulators 3 for ground insulation. Instead of the magnetic winding 4 and the interlayer insulating plate 5, interlayer insulating plates 5 A having the configuration shown in FIG. 1 are alternately inserted, and finally, the wedge 7 is pressed through the sub-wedge insulating block 6.

  Here, the details of the interlayer insulating plate 5A will be described with reference to FIG.

  In FIG. 1, an interlayer insulating plate 5A is a thin-leaf flexible epoxy glass laminate manufactured by using a silane-treated glass cloth as a base fabric, impregnating and applying an epoxy resin thereto, and then continuously heating and curing.

  Using this interlayer insulating plate 5A, high stress is generated on the interlayer insulating plate inserted in the axial direction between the field windings 4 when the rotating electrical machine is started and stopped, and the interlayer insulating plate 5A Is divided into two parts (for example, in the vicinity of the coil end part) where there is a high possibility of peeling and breaking, and a stepped part 5A-1 is formed by combining one step part formed by alternately cutting each end part. Constitute.

  The notch portion of the interlayer insulating plate 5A is formed by peeling off several layers of the laminated material end portion to be divided into two. In this case, the notch depth of the step portion is adjusted so that the stepped portion 5A-1 has the same thickness as the original thickness of the interlayer insulating plate 5A when the interlayer insulating plate 5A is stepped, Are overlapped so that there is a slight gap at the overlapping end.

  Further, the overlap margin “a” of the stepped portion 5A-1 of the interlayer insulating plate 5A is set to be 0.2% or more with respect to the iron core length.

  In the joint portion 5A-1 having such a configuration, one surface (lower surface) of the interlayer insulating plate 5A is attached to the field winding 4 with the synthetic resin adhesive as the bonding surface 8, and the other surface (upper surface) is bonded. The sliding surface 12 is not bonded to the field winding 4 of another layer. Further, the overlapping surface of the interlayer insulating plate 5A in the joint portion 5A-1 is also a sliding surface 9.

  Further, also in other parts other than the stepped portion 5A-1, one surface (lower surface) of the interlayer insulating plate 5A is attached to the field winding 4 with the synthetic resin adhesive as the bonding surface 8, and the other surface ( The upper surface is formed as a sliding surface 12 without being bonded to the field winding 4 of another layer.

  Therefore, in the structure in which the field winding 4 and the interlayer insulating plate 5A configured as described above are housed in the slot 2 of the rotor core 1, the interlayer insulating plate 5A is separated from the field winding 4 due to the generation of stress. However, since the interlayer insulating plate 5A has a stepped portion 5A-1 and the interlayer insulating plates divided into two at the stepped portion 5A-1 can slide, the interlayer insulating plate without the stepped portion is provided. As compared with the above, the stress generated in the interlayer insulating plate 5A can be reduced.

  Moreover, even if one of the upper and lower interlayer insulating plates 5A divided into two by the upper and lower joint portions 5A-1 cannot withstand the tensile stress and is broken, the other interlayer insulating plate 5A-1 exists. The occurrence of a short circuit between the layers can be prevented without forming a section where no interlayer insulating plate exists between the upper and lower field windings 4.

  As described above, according to the first embodiment of the present invention, even if the field winding is thermally expanded or contracted due to the deflection of the rotor shaft or the temperature change at the start or stop during the operation of the rotating electric machine, The insulating plate 5A does not break, and even if the interlayer insulating plate 5A breaks, there is one of the half-divided interlayer insulating plates in the stepped portion 5A-1 of the interlayer insulating plate 5A. It is possible to prevent the occurrence of a short circuit between lines.

  In the first embodiment, the portion where the interlayer insulating plate 5A is likely to peel and break (for example, the vicinity of the coil end portion) is divided into two, and the step portions formed by cutting out the respective end portions are staggered. Although the case where the stepped portion 5A-1 is configured in combination is described, as shown in FIG. 2, the portion (for example, the vicinity of the coil end portion) where the interlayer insulating plate 5A ′ is likely to peel and break is divided into two. Even if the respective end portions are notched so that a plurality of step portions are formed and these step portions are alternately combined to form the step joint portion 5A'-1, the same effect as described above can be obtained. it can.

(Second Embodiment)
FIG. 3 is an enlarged side view showing a part of an interlayer insulating plate according to the second embodiment of the present invention in an axial cross section. The same components as those in the first embodiment are denoted by the same reference numerals, and Then, the overlapping description is omitted. In addition, since the structure of the whole rotor based on this invention is the same as FIG. 5, it demonstrates using FIG. 5 together here.

  In the second embodiment, using the interlayer insulating plate 5B, high stress is generated on the interlayer insulating plate inserted in the axial direction between the field windings 4 when the rotating electrical machine is started and stopped. In addition, a portion (for example, the vicinity of the coil end portion) where the interlayer insulating plate 5B is likely to peel or break is divided into two to form notched step portions at the respective end portions, and the stepped surface has a stepped surface. While facing upward with a slight gap, a short interlayer insulating plate 10 is provided in a recess formed across the step surfaces of these notched step portions to form a stepped portion 5B-1. .

  The notch step portion of the interlayer insulating plate 5B is formed by peeling off several layers of the laminated material end portion of the portion to be divided into two. In this case, when the interlayer insulating plate 5B is stepped, the notch depth of the stepped portion and the short interlayer insulating plate 10 are set so that the stepped portion 5B-1 has the same thickness as the original thickness of the interlayer insulating plate 5B. Are adjusted so that there is a slight gap at each end.

  Further, the overlap margin “a” between the stepped surface of the interlayer insulating plate 5B and the short interlayer insulating plate 10 is set to be 0.2% or more with respect to the iron core length.

  In the joint portion 5B-1 having such a configuration, one surface (lower surface) of the interlayer insulating plate 5B is attached to the field winding 4 with the synthetic resin adhesive as the bonding surface 8, and the other side of the interlayer insulating plate 5B is bonded. The surface (upper surface) and the surface opposite to the concave portion of the short interlayer insulating plate 10 are formed as a sliding surface 12 without being bonded to the field winding 4 of another layer.

  In the stepped portion 5B-1, the stepped surface of the notched stepped portion formed in one interlayer insulating plate 5B and the overlapping surface of the short interlayer insulating plate 10 are used as the sliding surface 9, and the other interlayer insulating plate 5B. The overlapping surface of the stepped portion of the notch and the short interlayer insulating plate 10 is attached as a bonding surface 8 with a synthetic resin adhesive.

  Further, also in other parts other than the stepped portion 5B-1, one surface (lower surface) of the interlayer insulating plate 5B is attached to the field winding 4 with the synthetic resin adhesive as the bonding surface 8, and the other surface ( The upper surface is formed as a sliding surface 12 without being bonded to the field winding 4 of another layer.

  As described above, according to the second embodiment of the present invention, the same effect as that of the first embodiment can be obtained. In addition, in the case where a large number of interlayer insulating plates are connected, the interlayer insulating plate is There is an advantage that it is not necessary to consider the order of attaching to the windings, and even if the field windings are thermally expanded or contracted during operation of the rotating electrical machine due to deflection of the rotor shaft or temperature changes at start and stop The interlayer insulating plate 5B does not break, and even if the interlayer insulating plate 5B is broken, the stepped portion 5B-1 of the interlayer insulating plate 5B is divided into one half of the interlayer insulating plate 5B and the short interlayer. Since the insulating plate 10 exists, it is possible to prevent the occurrence of an interlayer short circuit in the field winding.

(Third embodiment)
FIG. 4 is an enlarged side view showing a part of an interlayer insulating plate according to the third embodiment of the present invention in an axial cross section. The same components as those in the first embodiment are denoted by the same reference numerals, and Then, the overlapping description is omitted. In addition, since the structure of the whole rotor based on this invention is the same as FIG. 5, it demonstrates using FIG. 5 together here.

  In the third embodiment, when it is difficult to process a notch step portion in the interlayer insulating plate 5C, the interlayer insulating plate 5C is not processed, and the portion where the interlayer insulating plate is likely to peel and break (for example, A groove 11 having a depth corresponding to the thickness of the interlayer insulating plate 5C is processed in the field winding 4 portion corresponding to the vicinity of the coil end portion, and one of the interlayer insulating plates 5C divided into two in the groove 11 is processed. The end is bent and inserted, and the end of the other interlayer insulating plate 5C is overlaid on the end.

  In this case, the overlap ends are overlapped so that there is a slight gap, and the overlap margin “a” at the end of the interlayer insulating plate 5C is 0.2% or more of the iron core length. It is. Further, the groove depth is adjusted so that the overlapping end portion of the interlayer insulating plate 5C and the interlayer insulating plate 5C in other portions have the same height surface.

  At the overlapping end portion of the interlayer insulating plate 5C having such a structure, the groove bottom surface side of one interlayer insulating plate 5C is attached to the field winding 4 with the synthetic resin adhesive as the bonding surface 8, and the other interlayer insulating plate The contact surface of the overlapping portion with 5C is not adhered, and a fluororesin is applied to make the sliding surface 9 in order to improve lubricity.

  Thus, by applying the fluororesin to the contact surface of the overlapping portion of the interlayer insulating plate 5C, the stress generated in the interlayer insulating plate can be further reduced.

  Also, in other parts other than the overlapping end of the interlayer insulating plate 5C, the lower surface of each of the divided interlayer insulating plates 5C is bonded to the field winding 4 with a synthetic resin adhesive as the bonding surface 8, The upper surface is a sliding surface 12 without being bonded to another field winding 4.

  As described above, according to the third embodiment of the present invention, the same effect as that of the first embodiment can be obtained without processing the interlayer insulating plate, and the deflection of the rotor shaft during the operation of the rotating electrical machine can be obtained. Even if the field winding is thermally expanded or contracted due to temperature changes at the time of starting and stopping, the sliding effect due to the coating of the fluororesin is added and the interlayer insulating plate 5C does not break. Even so, the end of the interlayer insulating plate 5C divided into two by the groove 11 portion provided in the portion where the interlayer insulating plate of the field winding 4 is likely to be peeled or broken is double-joined. Therefore, it is possible to prevent occurrence of an interlayer short circuit of the field winding at this portion.

  Although not particularly mentioned in the first embodiment and the second embodiment described above, the fluororesin is formed on the sliding surface between the ends of the interlayer insulating plate divided into two as in the third embodiment. Needless to say, the lubricity is improved by applying the coating.

  In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 ... Rotor core, 2 ... Slot, 3 ... Slot insulator, 4 ... Field winding, 5, 5A, 5B, 5C ... Interlayer insulation board, 5A-1, 5B-1, 6 ... Under-wedge insulation block, 7 ... Wedge, 8 ... Adhesive surface, 9,12 ... Sliding surface, 10 ... Short interlayer insulating plate, 11 ... Groove

Claims (8)

A rotating electrical machine configured such that field windings and interlayer insulating plates are alternately inserted into a plurality of slots provided in a rotor iron core via slot insulators, and these are pressed by a wedge via a sub-wedge insulator. In the rotor of
At least one portion in the axial direction of the interlayer insulating plate disposed between each layer of the field winding was divided into two, and the end of one interlayer insulating plate and the end of the other interlayer insulating plate were overlapped The stepped portion is configured such that the combined thickness of the portion and the field winding adjacent thereto is the same as the combined thickness of the interlayer insulating plate in the other part and the field winding adjacent thereto, Adhering one surface including the joint portion of the two-layered interlayer insulating plate to the field winding with an adhesive as an adhesive surface, and between the interlayer insulating plates of the stepped portion and the other of the interlayer insulating plates A rotor of a rotating electrical machine, wherein the surface is configured as a sliding surface without being bonded to a field winding of another layer. The rotor of the rotating electrical machine according to claim 1,
Rotation of a rotating electrical machine characterized in that the joint portion is configured as a joint portion that is formed by combining at least one step portion formed by alternately cutting off the respective end portions of the divided interlayer insulating plate. Child. The rotor of the rotating electrical machine according to claim 1,
The joint portion is formed by striking a notch step portion formed by notching each end portion of the bisected interlayer insulating plate with the step surface facing upward and straddling between the step surfaces of these notch step portions. It is configured as a stepped portion with a short interlayer insulating plate provided in the recessed portion, and the stepped surface of the notched step formed on one of the two interlayer insulating plates and the overlapping surface of the short interlayer insulating plate Rotation of a rotating electrical machine characterized by having a sliding surface and bonding with an adhesive with the stepped surface of the notched step formed on the other interlayer insulating plate and the overlapping surface of the short interlayer insulating plate as the adhesive surface Child. The rotor of the rotating electrical machine according to claim 1,
The joint is inserted into the field winding by overlapping the end of the interlayer insulating plate divided into two into a groove processed to a depth corresponding to the thickness of the interlayer insulating plate. A rotor of a rotating electrical machine configured to be flush with a portion of an interlayer insulating plate other than the portion. In the rotor of the rotary electric machine according to any one of claims 1 to 4,
A rotor of a rotating electrical machine, wherein a fluororesin coating is applied to sliding surfaces between ends of an interlayer insulating plate divided into two by the joint. In the rotor of the rotary electric machine according to any one of claims 1 to 4,
A rotor of a rotating electrical machine, wherein an overlap margin at an end portion of an interlayer insulating plate divided into two by the joint portion is 0.2% or more with respect to the length of the rotor core. In the rotor of the rotary electric machine according to any one of claims 1 to 4,
A rotor of a rotating electrical machine characterized in that a portion where the interlayer insulating plate is divided into two and a joint portion is formed is a portion where the interlayer insulating plate is likely to peel and break.   A rotating electrical machine comprising the rotor of the rotating electrical machine according to any one of claims 1 to 7.

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