JP4282466B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a support structure at a stator coil end of a rotating electrical machine, and in particular, a coil end formed by upper and lower stator coils extending from both ends of a stator core formed by stacking steel plates. It relates to a supporting structure.

In the support structure of the stator coil end in the conventional rotating electric machine, the coil end is formed by the upper-end stator coil and the lower-end stator coil wound around the stator core, and the coil end support The stator coil and the resin ring are fastened by the member and the glass string.
Moreover, the upper opening stator coil and the lower opening stator coil are electrically coupled by the series connection portion.

  Furthermore, the inner wall of the frame that fixes the stator core retainer plate and the rotating electrical machine stator core is disposed, and the insulating filler fixes the adjacent coils in the circumferential direction. Reinforcing padding made of an insulating block is attached in order to suppress vibrations (see, for example, Patent Document 1).

  In such a conventional rotating electric machine stator coil end support structure, when the rotating electric machine is operated, a magnetic field generated by the armature current flowing through the upper and lower stator coils and a field current flowing through the rotor coil are generated. Due to the effect of the magnetic field, electromagnetic force acts on the upper and lower stator coils and the stator core at the coil end, and vibration occurs at the coil end, so the coil end has sufficient rigidity. Furthermore, it is necessary to have a natural frequency that excludes the dangerous frequency range.

Further, in the conventional structure for supporting the end of a rotating electric machine stator coil, a reinforcing pad is attached between the series connection parts, and this reinforcing pad has an appropriate rigidity to avoid resonance with the electromagnetic frequency in the series connection part. While giving partial vibrations.
Further, since the reinforcing filler is inserted at all locations between the series connection portions, an annular ring is formed at the tip end portion of the coil end, which contributes to the improvement of the rigidity of the entire coil end.

JP-A-7-59286

Since the support structure of the conventional rotating electrical machine stator coil end portion is configured as described above, the reinforcing filling needs to be in close contact with the series connection portion, and in order to match the gap for inserting the reinforcing filling, The finished gap has been measured, and the insulation block has been scraped off at the production site to produce and install a reinforcing pad.
For this reason, there is a problem that work for matching the actual items must be performed, which requires a lot of time and labor.

At the same time, such a structure that requires actual matching makes it difficult to determine the rigidity of the coil end at the design stage.
In addition, there is a problem that the experience and skill of the operator are required to obtain stable quality.

  The present invention has been made to solve the above-described problems. By easily increasing the natural frequency in the series connection portion of the rotating electrical machine, the resonance with the electromagnetic frequency can be avoided and the partial forcing can be performed. An object of the present invention is to provide a support structure for a rotating electric machine stator coil end portion that can also suppress vibration.

It is another object of the present invention to reduce the manufacturing cost by reducing the number of component parts at the coil end of the rotating electrical machine and by reducing the actual work in the coil end manufacturing process.
Furthermore, it is intended to provide a coil end with stable quality without depending on the skill and experience of the operator, and to prevent the natural frequency of the coil end from entering the dangerous frequency range when the rotating electrical machine is in operation. And

According to a first aspect of the present invention, there is provided a rotating electrical machine that combines an upper-end stator coil and a lower-end stator coil extending from both ends of a stator core, and the upper-end stator coil and the lower-end stator coil. The coil end portion is formed from the series connection portion, and the sleeve mixer is made to make one turn along the outer periphery of the upper end stator coil while contacting the sleeve connection portion, and then the upper end stator. The gap between the coil and the lower-end stator coil is passed, and further, it is made to make one turn along the outer periphery of the lower-end stator coil and continuously wound in the circumferential direction.

According to the rotary electric machine according to claim 1 of the present invention, the upper and lower stator coils extending from both ends of the stator core, and the upper and lower stator coils are provided. A coil end portion is formed from a series connection portion to be joined, and the sleeve mixer is brought into contact with the series connection portion and is made to make a round along the outer periphery of the upper end stator coil, and then the upper end Passing through the gap between the stator coil and the lower stator coil, and then making a round along the outer periphery of the lower stator coil and continuously winding it in the circumferential direction. By increasing the natural frequency in the part, resonance with the electromagnetic frequency can be avoided and partial forced vibration can also be suppressed.

Further, the manufacturing cost can be reduced by reducing the number of component parts at the coil end portion of the rotating electrical machine and by reducing the actual work in the process of manufacturing the coil end portion.
Furthermore, the coil end having stable quality can be provided without depending on the skill and experience of the operator, and the natural frequency of the coil end can be prevented from entering the dangerous frequency range when the rotating electrical machine is in operation. .

Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 is a side view showing a stator coil end structure of a rotating electrical machine according to Embodiment 1 of the present invention, FIG. 2 is a plan view seen from the direction A in FIG. 1, and FIG. 3 is seen from the direction B in FIG. It is a front view.
In the figure, an upper opening stator coil 2 and a lower opening stator coil 3 extend from both ends of a stator iron core 1 formed by laminating steel plates, and the series connection portion 4 includes the upper opening stator coil 2 and It is formed of a connection plate that electrically couples the lower-mouth stator coil 3.
Further, the stator coils 2 and 3 and the resin ring 7 are fastened by the coil end support member 5 and the glass string 6 dipped in the resin.

  4 is a perspective view showing a sleeve 8 woven using all or part of aramid fiber or glass fiber, and FIG. 5 is a cross-sectional view taken along the line CC in FIG. A curable resin 9 such as a mix char made of glass fiber is injected.

The curable resin 9 such as a mix char injected into the sleeve 8 is cured together with the sleeve 8 at room temperature or heat.
In this way, the sleeve mixture 10 is formed as a whole by injecting and curing the curable resin 9 such as a mixture into the sleeve 8.
In this embodiment, such a sleeve mix 10 is used. First, the sleeve 8 is laid so as to meander and sew the gap G of the series connection portion 4, and then the curable resin 9 is placed in the sleeve 8. inject.
Then, the curable resin 9 injected into the sleeve 8 is manufactured together with the sleeve 8 at room temperature or heat curing.

  Thus, by filling and restraining the gap G between the adjacent series connection parts 4 with the hardened sleeve mixture 10, the natural frequency of the series connection parts 4 can be appropriately increased to avoid resonance and partially Can be suppressed.

Further, since the sleeve mixture 10 can flexibly cope with the variation in the dimension of the gap G between the series connection portions 4, the production of the reinforcing filling at the production site as conventionally performed is omitted. be able to.
Further, in the past, the same number of reinforcing fillings as the number of gaps G had to be produced and inserted, but in the present invention, one sleeve mixer 10 is used or several pieces are used when divided. All that is required is a significant reduction in the number of parts.

Embodiment 2. FIG.
6 is a plan view showing a stator coil end structure of a rotating electrical machine according to Embodiment 2 of the present invention, and FIG. 7 is a front view of the same.
In the present embodiment, the sleeve mix 10 is wound around the outer periphery of the series connection portion 4 and then wound around the outer periphery of the adjacent series connection portion 4 as well. The connection part 4 is wound.

As a result, the sleeve mix 10 is wound so as to be connected to only the series connection portion 4 in the circumferential direction.
By configuring as described above, the sleeve 8 having a relatively small diameter can be used as compared with the case of the first embodiment, and the amount of the curable resin 9 such as a mixture injected into the inside can be reduced. it can.

Embodiment 3 FIG.
FIG. 8 is a front view showing a stator coil end structure of a rotating electric machine according to Embodiment 3 of the present invention. In FIG. 1 around the outer periphery of the lower stator coil 3, and further around the outer periphery of the lower opening stator coil 3.
After that, one round is made again along the outer periphery of the adjacent upper-opening stator coil 2 and the sleeve mix 10 is continuously wound over the circumferential direction.
In this way, the sleeve mix 10 is wound around the upper mouth stator coil 2, the series connection portion 4 and the lower mouth stator coil 3 so as to be entangled in an eight-letter shape.

With the configuration described above, the sleeve mixer 10 is restrained from moving toward the axial machine outer side O shown in FIG. The child coil 2 and the lower mouth stator coil 3 are restrained because they have the inclination angle α.
That is, it is possible to prevent the sleeve mix 10 from moving in the axial direction when the rotating electrical machine is operating.
Further, by constraining the upper opening stator coil 2 and the lower opening stator coil 3 in the radial direction R and the circumferential direction at the same time, the axial length L of the coil end can be reduced, and the rigidity of the coil end can be reduced. Will improve.

Embodiment 4 FIG.
FIG. 9 is a front view showing a stator coil end structure of a rotating electrical machine according to Embodiment 4 of the present invention. In the figure, two sleeves 8 are connected to an upper stator coil 2 and a lower stator coil 3. While sandwiching between them, they are placed in contact with the series connection portion 4.
Then, the block 11 is disposed between the two sleeves 8 positioned in the gap G of the series connection portion 4, and a curable resin 9 such as a mixture is injected into the sleeve 8.

The sleeve mixture 10 completed by curing is inserted into the gap G of the series connection portion 4 in a convex shape 12 to form a wedge.
With this wedge, the natural frequency of the series connection portion 4 can be increased moderately and partial forced vibration can be suppressed.
Further, since one reinforcing ring is formed on the circumference, it is possible to contribute to improving the rigidity of the coil end.

It is a side view which shows the stator coil end part structure of the rotary electric machine by Embodiment 1 of this invention. It is the top view seen from the A direction of FIG. It is the front view seen from the B direction of FIG. It is a perspective view which shows a sleeve. It is CC sectional view taken on the line in FIG. It is a top view which shows the stator coil end part structure of the rotary electric machine by Embodiment 2 of this invention. It is a front view which shows the stator coil end part structure of the rotary electric machine by Embodiment 2 of this invention. It is a front view which shows the stator coil end part structure of the rotary electric machine by Embodiment 3 of this invention. It is a front view which shows the stator coil end part structure of the rotary electric machine by Embodiment 4 of this invention.

Explanation of symbols

1 Stator iron core, 2 Upper mouth stator coil, 3 Lower mouth stator coil,
4 series connections, 10 sleeve mix, 11 blocks.

Claims (2)

A coil end portion is formed from an upper-port stator coil and a lower-port stator coil extending from both ends of the stator core, and a series connection portion that couples the upper-port stator coil and the lower-port stator coil. In the rotating electrical machine, after the sleeve mixer makes one turn along the outer periphery of the upper stator coil while abutting the sleeve mixer on the series connection portion, the gap between the upper stator coil and the lower stator coil The rotating electrical machine is further characterized in that it is wound around the circumference of the lower stator coil and continuously wound in the circumferential direction. A coil end portion is formed from an upper-port stator coil and a lower-port stator coil extending from both ends of the stator core, and a series connection portion that couples the upper-port stator coil and the lower-port stator coil. In the rotary electric machine, the two sleeve mixers are sandwiched between the upper-portion stator coil and the lower-portion stator coil, and a block is formed between the two sleeve mixers located in the gap between the series connection portions. A rotating electric machine characterized by the arrangement of

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