JP4527600B2 - Insulation structure of coil connection part of rotating electrical machine - Google Patents

Description

  The present invention relates to a series connection insulating structure at a coil end of a stator coil of a rotating electrical machine.

  In conventional series connection part insulation, the ends of the bare conductors of the lead portions of the upper coil and the bottom coil are connected by brazing, a compound is packed between the connection part strands of the coil, and an insulating tape is wound from above.

  In addition, conventional series connection insulation is disclosed in, for example, Japanese Patent Laid-Open No. 2000-23404 (Patent Document 1), Japanese Patent Laid-Open No. 2000-4553 (Patent Document 2), and Japanese Patent Laid-Open No. 2002-345195. Japanese Patent Laid-Open No. 10-146026 (Patent Document 3), Japanese Patent Laid-Open No. 9-215244 (Patent Document 5).

  Even when an insulation cap is used, connect the bare conductor end of the lead-out part of the top coil and bottom coil using a connection conductor, hold the compound in the coil connection part, and then integrate, cylindrical, or combine from above Install the type of insulation cap.

Japanese Patent Laid-Open No. 2000-23404 Japanese Patent Laid-Open No. 2000-4553 Japanese Patent Laid-Open No. 2002-345195 Japanese Patent Laid-Open No. 10-146026 Japanese Patent Laid-Open No. 9-215244

  The conventional series connection insulation has the following problems.

  Taping insulation at the series connection requires a long time because of manual work. In addition, the finishing state changes depending on the skill of the operator.

  There is a problem that the compound of the series connection portion is not uniformly filled when the integral type or cylindrical type insulating cap is attached.

  Even in the case of a combination type of two-part insulation cap, when the shape is complicated or the left and right are different, defects such as a mistake in the combination are likely to occur during the installation of the insulation cap. In addition, when the number of types of insulating caps increases, the number of molds for manufacturing the caps increases, which increases costs.

  Further, even in the case of a combination type two-part insulating cap, it is required that the compound be filled more evenly without gaps to the depth of the series connection portion.

  In the case of a turbine generator, since the series connection portion protrudes in the lateral direction (horizontal direction), the two-part insulating cap is attached so that the combination opening side is aligned.

  However, in the case of a water turbine generator, since the series connection portion protrudes in the vertical direction, the two-part insulating cap cannot be attached so as to match the combination opening side. For this reason, in the case of a water turbine generator, it is necessary to prepare a two-part insulating cap having a different shape.

  The present invention addresses the above problems and uses a two-part insulating cap, and the compound is filled evenly and without gaps to the back of the series connection portion, and the protruding direction of the series connection portion is vertical / horizontal. It is an object of the present invention to provide a coil connection part insulating structure of a rotating electrical machine that can be attached in any case.

  The present invention provides a coil connection part insulating structure of a rotating electrical machine that is insulated with an insulating cap that covers a series connection part, wherein the insulating cap is formed of a pair of insulating cap pieces to be combined, and the insulating cap piece includes a main wall part, A pair of insulating cap pieces having two facing facing side walls rising from the edge of the main wall portion and a rear side wall provided so as to close between the rear end sides of the facing side walls, the facing side wall and the rear portion An insertion groove into which the opposite side wall of the counterpart insulating cap piece is inserted is provided so that the inner and outer surfaces of the side wall overlap each other.

  According to the present invention, the compound is filled more evenly without gaps to the back of the series connection part, and the coil connection part of the rotating electrical machine can be mounted even if the protruding direction of the series connection part is vertical or horizontal An insulating structure can be provided.

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

  FIG. 1 is a diagram showing an internal structure of a turbine generator that is a rotating electrical machine, and includes a stator frame 1 and a stator core 2. The upper coil 4 and the bottom coil 5 are mounted in the slot 3 of the stator core 2. The bottom coil 5 is placed on the back side of the slot 3 and the top coil 4 is placed on the outside.

  As shown in FIG. 2, the coil ends of the upper coil 4 and the bottom coil 5 are electrically connected by a series connection portion 6. The series connection portion 6 protruding sideways from the end of the stator core 2 is insulated by an insulating cap 9.

  As shown in FIGS. 3 and 4, the series connection portion 6 is configured by connecting the bare conductor end portions 7 of the lead portions of the upper coil 4 and the bottom coil 5 by brazing. An insulation cap 9 is put on the series connection portion 6, and a gap between the insulation cap 9 and the series connection portion 6 is filled with a compound 8 of an insulating material, and the series connection portion 6 is buried in the compound 8.

  Since the series connection portion 6 is buried in the compound 8 of the insulating material and covered with the insulating cap 9, the ground insulation is sufficiently maintained.

  The insulating cap 9 will be described in detail with reference to FIGS.

  The insulating cap 9 includes two insulating cap pieces 9A. 9B is formed in combination. Here, the same insulating cap pieces 9A. 9B will be described as an example.

  Same insulating cap 9A. The 9B piece is made of one type of molding die. Also, unlike the two types of insulating cap pieces, there is no difference in the combination during the mounting operation, and the mounting operation is easy.

  Insulation cap piece 9A. As shown in FIGS. 5 to 9, 9B includes a main wall portion 90, two facing facing side walls 91.92 rising from an end edge of the main wall portion 90, and a rear end side of the facing side wall 91.92. And a rear side wall 93 provided so as to be closed.

  Insulation cap piece 9A. 9B is formed with the insulating cap 9 by combining the combination opening side opposite to the main wall 90. The opposite side of the rear side wall 93 is the front opening, and the lead portions of the upper coil 4 and the bottom coil 5 are placed in the front opening.

  A pair of insulating cap pieces 9A. 9B has an insertion groove 94 into which the facing side wall of the counterpart insulating cap piece is inserted so that the inner and outer surfaces of the facing side wall 91.92 and the rear side wall 93 overlap each other. The insertion groove 94 is provided at a corner of the facing side wall 91 and the rear side wall 93.

  The thickness of the two facing side walls 91.92 is the same. On the inner side surface of the facing side wall 91, a stopper step portion 95 with which the end of the facing side wall 92 of the counterpart insulating cap piece abuts is formed. For this reason, the main wall 90 side (the base side) is thicker than the stopper step 95.

  Insulation cap piece 9A. 9B is formed of a thermosetting molding material (synthetic resin) in which a curing agent, a reinforcing material, and a filler are blended based on a polyester resin. The thermosetting molding material itself is fast-curing, has a fast molding cycle, good molding flowability, and enables low-pressure molding. Moreover, since the molding shrinkage rate is small, it is excellent in crack resistance, arc resistance, tracking resistance and dimensional accuracy.

  Insulation cap piece 9A. 9B are combined as shown in FIG. In this combination, the insulating cap pieces 9A... Are connected to the series connection 6 of the turbine generator placed sideways as shown in FIG. Suitable for mounting 9B.

  Attachment is performed as follows.

  Insulating cap piece 9A. 9B, the insulating cap pieces 9A. Match the combination opening side of 9B. The opposing side walls 91 of the mating insulating cap piece are respectively inserted into the insertion grooves 94. Then, the insulating cap pieces 9A. Press 9B to hold each other. Until the end of the facing side wall 92 of the mating insulating cap piece abuts against the stopper step 95 of the facing side wall 91, the insulating cap piece 9A. They are embraced so as to approach 9B.

  By this tying, the filling compound 8 is compressed, so that the filling can be performed more evenly and evenly with no gap to the depth of the series connection portion 6.

  Since the series connection 6 is insulated by the good filling of the compound evenly and the insulating cap 9, the ground insulation is sufficiently maintained.

  Further, the insulating cap piece 9A. When tying them closer to 9B, the excess compound overflows from the front opening where the lead portions of the upper coil 4 and the bottom coil 5 are placed. This overflowing compound is removed. Insulation cap piece 9A. It is desirable to adjust the amount of compound put into 9B. Insulation cap piece 9A. Since tying and attaching so as to approach 9B, adjustment that adjusts to a small extent is easy.

  Further, the insulating cap piece 9A. When assembling 9B, the end of the facing side wall 92 abuts against the stopper step 95 of the facing side wall 91 and stops, so that the attachment work is easy. Since the groove width of the insertion groove 94 is slightly larger than the plate thickness of the facing side wall 92, the facing side wall 92 easily enters the insertion groove 94, and the insulating cap pieces 9A. It is easy to tie 9B.

  Furthermore, the insulated cap pieces 9A. 9B, the opposing side wall 92 of the counterpart insulating cap piece is inserted into the insertion groove 94 so that the outer side surface of the opposing side wall 92 of the other insulating cap piece overlaps the inner side surface of the opposing side wall 91 of one insulating cap piece. Are combined. Due to this overlap and insertion of the facing side wall 92 into the insertion groove 94, the insulating cap pieces 9A. Since 9B is a stable combination with no rattling, the filler with good finish is cured without leaking the compound, and the insulation is improved.

  Insulation cap piece 9A. 9B has a sandblast finish (finished pear finish) on the inner surface. The compound adheres well to the surface of the pear finish, and the insulating cap piece 9A. A 9B strong bond is provided.

  Another embodiment shown in FIGS. 12 and 13 will be described.

  This embodiment has a configuration in which the bare conductor end portions 7 of the lead portions of the upper coil 4 and the bottom coil 5 are connected via a connection conductor 11 and joined by brazing. The insulating cap 9 and the compound used are the same as in the previous embodiment. Further, the insulating cap piece 9A. The attachment of 9B is the same.

  Another embodiment shown in FIGS. 14 and 15 will be described.

  The rotating electrical machine shown in this embodiment is a water turbine generator. The difference from the turbine generator mentioned in the previous embodiment is that the turbine generator is installed horizontally, whereas the turbine generator is installed vertically.

  The turbine generator includes a stator frame 1, a stator core 2, an upper coil 4, a bottom coil 5, and a slot 3.

  The series connection portion 6 protruding vertically (in the vertical direction) from the end portion of the stator core 2 is insulated by an insulating cap 9. Since the series connection portion 6 protrudes in the vertical direction, the insulating cap 9A. 9B is attached as shown in FIG.

  That is, the insulating cap piece 9A. 9B is placed vertically, the opposing side wall 92 of the mating insulating cap piece is inserted into the insertion groove 94, and the insulating cap piece 9B is slited upward with respect to the insulating cap piece 9A. Is covered. In this way, it is easy to attach the insulating cap 9 to the serial connection portion 6 protruding in the vertical direction by sliding the other insulating cap piece upward with respect to the one insulating cap piece.

  In addition, since the inner surface (upper surface) of the rear side wall 93 of the other insulating cap piece abuts on the outer side surface (lower surface) of the rear side wall 93 of one insulating cap piece and the slite is stopped, the mounting is completed. It is easy to know.

  As described above, the insulating cap pieces 9A. 9B is a mounting method (in the case of a horizontal rotary electric machine) that is attached to the series connection portion 6 so that the combination opening side that is opposite to the main wall portion 90 is combined, and the other insulating cap piece with respect to one insulating cap piece An attachment method (in the case of a rotary electric machine installed in a vertical position) that can be attached to the series connection portion 6 so that the piece is slited upward is possible.

  Thus, this set of insulating cap pieces 9A. Since 9B can be used for an insulating cap of a rotating electric machine of either horizontal installation or vertical installation, the types of insulating cap pieces can be reduced.

The figure which concerns on the Example of this invention and shows the internal structure of a turbine generator. The figure which concerns on the Example of this invention, and expanded the (a) part of FIG. Sectional drawing concerning the Example of this invention, and a series connection part. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 according to the embodiment of the present invention. The perspective view of the insulation cap piece concerning the Example of this invention. The front view seen from the inner side of the insulating cap piece according to the embodiment of the present invention. The side view of the insulating cap piece according to the embodiment of the present invention. FIG. 7 is an AA cross-sectional view of FIG. 6 according to the embodiment of the present invention. FIG. 7 is a cross-sectional view taken along the line BB in FIG. The figure which concerns on the Example of this invention and shows an example of an assembly of the insulation cap piece. The figure which concerns on the Example of this invention and shows the other example of an assembly of an insulation cap piece. FIG. 4 is a cross-sectional view of a series connection corresponding to FIG. 3 according to another embodiment of the present invention. FIG. 13 is a cross-sectional view taken along the line AA in FIG. 12 according to another embodiment of the present invention. The figure which concerns on the other Example of this invention, and shows the internal structure of a water turbine generator. The figure which concerns on the Example of this invention, and expanded the (a) part of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Stator frame, 2 ... Stator iron core, 3 ... Slot, 4 ... Top coil, 5 ... Bottom coil, 6 ... Series connection part, 7 ... Bare conductor end part, 8 ... Compound, 9 ... Insulation cap, 9A ... Insulating cap piece, 9B ... insulating cap piece, 11 ... connecting conductor, 90 ... main wall portion, 91 ... facing side wall, 92 ... facing side wall, 93 ... rear side wall, 94 ... insertion groove, 95 ... stopper step.

Claims (6)

An insulating cap that covers the above-mentioned series connection part, a series connection part that is electrically connected by brazing or the like to the bare conductor ends of the lead-out part of the upper coil and the bottom coil that are attached to the slot of the stator core of the rotating electrical machine, In the coil connection part insulation structure of the rotating electrical machine that is insulated by this insulation cap and the insulating filler that fills the gap between the series connection part,
The insulating cap is formed of a pair of insulating cap pieces to be combined,
The insulating cap piece has a main wall portion, two facing facing side walls rising from an end edge of the main wall portion, and a rear side wall provided so as to close between the rear end sides of the facing side walls,
The pair of insulating cap pieces combined, the as inner and outer surfaces of the opposing side walls and said rear side wall is mated overlap each other, in that a insertion groove facing the side wall of the mating insulation cap piece is inserted into the facing side walls A coil connection part insulation structure of a rotating electrical machine that is characterized. In the coil connection part insulation structure of the rotary electric machine according to claim 1,
The insulating structure for a coil connection part of a rotating electrical machine, wherein the pair of insulating cap pieces have the same shape. In the coil connection part insulation structure of the rotary electric machine according to claim 1,
Two of the opposite side wall is formed to the same thickness, and the coil connection portion insulating structure of a rotating electric machine groove width of the insertion groove is equal to or wider than the thickness of said facing side walls. In the coil connection part insulation structure of the rotary electric machine according to claim 3,
A coil connection part insulating structure for a rotating electrical machine, wherein a stopper step portion is provided on the inner surface side of the facing side wall of the insulating cap piece, with which an end portion of the facing side wall of the mating insulating cap piece abuts. In the coil connection part insulation structure of the rotating electrical machine according to any one of claims 1 to 4,
The insulating cap piece is made of a thermosetting molding material in which a curing agent, a reinforcing material, and a filler are blended based on a polyester resin, and the coil connection portion insulating structure for a rotating electrical machine. In the coil connection part insulation structure of the rotating electrical machine according to any one of claims 1 to 5,
A coil connection part insulating structure for a rotating electrical machine, wherein an inner surface of the insulating cap piece is finished in a pear-finished surface.

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