JP4586464B2 - Rotor cooling structure of rotating electric machine - Google Patents

Description

  The present invention relates to a rotor cooling structure for a rotating electrical machine such as a motor or a dynamometer.

  As a conventional rotor cooling structure of a rotating electrical machine, a cooling hole whose end is closed from one end is provided in a rotating shaft, a pipe is inserted into the hole from the fixed side, and a cooling medium made of liquid or the like is injected into the pipe. Patent Document 1 or Patent Document 2 discloses that this cooling medium is folded from the tip of the cooling hole so as to flow therethrough. Here, Patent Document 2 will be described with reference to FIG.

  FIG. 2 is a half longitudinal front view of a rotating electrical machine having a conventional rotor cooling structure disclosed in Patent Document 2, wherein 1 is a case, 2 is a stator provided on the inner periphery of the case 1, and 3 is a bearing 4. A rotating shaft that is rotatably supported by the case 1 via the. A rotor 5 is attached to the outer periphery of the rotating shaft 3 so as to face the stator 2. The rotating shaft 3 is provided with a cooling hole 3a whose end is closed from one end side to the vicinity of the other end, and a spiral groove 3b as a cooling medium flow assisting portion is provided on the inner periphery of the cooling hole 3a. Yes. 6 is a cover attached to the case 1, and 7 is a pipe inserted coaxially into the cooling hole 3 a, and one end of the pipe 7 is attached to the cover 6 via a pipe fixing portion 8. The pipe fixing portion 8 is provided with a supply inlet 8a communicating with the inside of the pipe 7, and a supply source of a cooling medium is connected to the supply inlet 8a. A discharge chamber 9 is formed in the cover 6, and the discharge chamber 9 is provided with a discharge port 9 a.

  In the above configuration, the cooling medium supplied from the supply port 8a flows from one end to the other end in the pipe 6, and then cools the rotor 5 from the tip of the cooling hole 3a while cooling the outer periphery of the pipe 7 and the cooling medium. It flows in the reverse direction between the holes 3a, falls into the discharge chamber 9, and is discharged to the outside through the discharge port 9a. During this time, since the groove 3b is spiral, the flow of the cooling medium is assisted according to the rotation of the rotating shaft 3.

  FIG. 3 is a longitudinal sectional front view of a main part of a rotating electrical machine having a rotor cooling structure similar to the conventional rotor cooling structure shown in FIG. 2, and 10 is a rotating shaft, and the tip is closed from one end to the vicinity of the other end. The cooling hole 10a is formed, and a pipe 7 having one end attached to the cover 6 is coaxially inserted into the cooling hole 10a as in the case of FIG. A rotor core 11 is attached to the outer periphery of the rotating shaft 10 so as to face the stator 2, and an end ring 13 is attached to the rotor core 11 via a rotor winding 12. A clamper receiver 14 fitted to the outer periphery of the rotary shaft 10 is attached to the end ring 13 by a bolt 15, and a clamper 16 is fitted and fixed to the outer periphery of the end ring 13 and the clamper receiver 14.

Also in the configuration of FIG. 3, after the cooling medium flows from the cooling medium supply source through the supply port 8 a from one end to the other end in the pipe 7 as indicated by the arrow, the tip of the cooling hole 10 a of the rotating shaft 10 is And is discharged to the outside through the discharge port 9a between the pipe 7 and the cooling hole 10a and through the discharge chamber 9.
JP 7-250456 A JP 2001-197705 A

  In the rotor cooling structure of the conventional rotating electric machine shown in FIG. 3, the rotor core 11 and the rotor winding 12 and the like and the cooling medium flowing through the cooling hole 10a are long, so the rotor The cooling efficiency of was poor. Further, the end ring 13 is connected to the rotor winding 12 and becomes a heat generating portion, but sufficient cooling cannot be performed. In addition, when the spiral groove 3b is provided on the inner periphery of the cooling hole 3a of the rotating shaft 3 as shown in FIG. 2, the cooling hole 3a is closed at the tip, so that the groove 3b is cut with a tool. In addition, the cutting operation can be performed only from the open end side of the cooling hole 3a, and the tool is bent, and the accurate cutting operation cannot be performed.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The rotor of the rotating electrical machine can sufficiently cool the rotor including the end ring and can easily cut the groove. The purpose is to obtain a cooling structure.

In the rotor cooling structure for a rotating electrical machine according to claim 1 of the present invention, a cooling hole is formed from one end of the rotating shaft to the other end , and a closing member is attached to the other end surface of the rotating shaft by a bolt. while closing the ends of the cooling holes by the closing member, the outer periphery to the mounting of the damper receiving money that is integrated with the end rings of the rotor of the closing member, the inner periphery in the groove of the cooling hole of the rotary shaft is provided, In addition, a pipe is inserted into the cooling hole of the rotating shaft from the fixed side, and the cooling medium passed through the pipe is folded back from the closed end side of the cooling hole so as to pass between the cooling hole and the pipe. It is a thing.

According to a second aspect of the present invention, in the rotor cooling structure for a rotating electric machine according to the first aspect, the closing member is provided with a communication hole penetrating in the radial direction and communicating with the cooling hole of the rotating shaft, and the communication with the clamper receiver. A communication hole for closing the tip communicating with the hole is provided, and the cooling medium is allowed to flow through the cooling hole and the communication hole through the communication hole of the clamper receiver.

  As described above, according to the first aspect of the present invention, the other end of the rotating shaft provided with the cooling hole from one end to the other end is closed by the closing member, and the groove is formed in the inner periphery of the cooling hole of the rotating shaft. By providing the groove, the distance between the rotor and the cooling medium is reduced, the cooling area is increased, and the cooling efficiency of the rotor is improved. In addition, since the cooling hole of the rotating shaft is a through hole, the cutting operation of the groove of the cooling hole can be performed from both ends of the rotating shaft, and the length of the tool can be shortened. Therefore, an accurate cutting operation can be easily performed.

  According to claim 2, the other end side of the rotary shaft provided with a cooling hole from one end to the other end is closed by the closing member, and the clamper receiver integrated with the end ring of the rotor on the outer periphery of the closing member Since the connecting member is provided with a communicating hole that penetrates the closing member in the radial direction and communicates with the cooling hole, and the communicating hole that communicates with the cooling hole via the communicating hole is provided in the clamper receiving member. The cooling medium is passed through the communication holes through the cooling holes and the communication holes, the clamper receiving metal is cooled by the cooling medium, the end ring as the heat generating portion is cooled, and the rotor is efficiently cooled.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional front view of a main part of a rotating electrical machine having a rotor cooling structure according to the present invention. Reference numeral 17 denotes a rotor core 11 attached to the outer periphery and a cooling hole 17a drilled from one end to the other end. A closing member 21 is attached to the other end side of the rotating shaft 17 by a bolt 18 and is closed. The closing member 21 is formed with a recess 21a continuous with the cooling hole 17a, and a groove 17b is provided on the inner periphery of the cooling hole 17a of the rotating shaft 17. Further, the pipe 7 is inserted into the cooling hole 17a and the recess 21a from the fixed side (the pipe fixing portion 8 in FIG. 2) as in the conventional case.

  Further, a clamper base 14 integrated with the end ring 13 is attached to the outer periphery of the closing member 21 as in the prior art, and a communication hole 21b communicating with the cooling hole 17a via the recess 21a is attached to the closing member 21. Is provided penetrating in the radial direction, and the clamper receiver 14 is also provided with a communication hole 14a with a closed end that communicates with the communication hole 21b. Further, seal rings 19 and 20 are embedded in both sides of the communication hole 21b in the axial direction on the outer periphery of the closing member 21 to seal the leakage of the cooling medium.

  In the above configuration, the cooling medium supplied from the supply port 8a flows from one end to the other end of the pipe 7, and then turns back from the closed end side of the cooling hole 17c to be between the outer periphery of the pipe 7 and the cooling hole 17a. Flowing. In addition, the cooling medium flows into the communication hole 14a of the clamper receiver 14 from the cooling hole 17a through the recess 21a and the communication hole 21b.

  In the above-described best embodiment, since the cooling hole 17a is provided with the groove 17b, the distance between the rotor such as the rotor core 11 and the cooling medium is shortened and the cooling area is increased. The cooling efficiency of the rotor such as the core iron core 11 is improved. Further, since the cooling hole 17a of the rotating shaft 17 is a through hole, the cutting operation of the cooling hole 17a can be performed from both ends of the rotating shaft, and the length of the tool can be shortened. Deflection does not occur, and an accurate cutting operation can be easily performed. Further, the clamper receiver 14 integrated with the rotor end ring 13 is provided with a communication hole 21b provided in the closing member 21 and a communication hole 14a with a closed end that communicates with the cooling hole 17a through the recess 21a. Therefore, the clamper receiver 14 is cooled by the cooling medium, and the end ring 13 as the heat generating portion is also cooled, so that the rotor is effectively cooled.

It is a principal part longitudinal front view of the rotary electric machine which has a rotor cooling structure by this Embodiment best mode. It is a half vertical front view of the rotary electric machine which has the conventional rotor cooling structure shown by patent document 2. FIG. It is a principal part longitudinal cross-sectional front view of the rotary electric machine which has the conventional rotor cooling structure similar to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Stator 4 ... Bearing 6 ... Cover 7 ... Pipe 8 ... Pipe fixing | fixed part 8a ... Feed inlet 9a ... Discharge port 11 ... Rotor core 12 ... Rotor winding 13 ... End ring 14 ... Clamper metal 14a ... Communication hole 17 ... Rotating shaft 17a ... Cooling hole 17b ... Groove 21 ... Occlusion member 21a ... Recess 21b ... Communication hole

Claims (2)

A cooling hole is drilled from one end of the rotating shaft to the other end , a closing member is attached to the other end surface of the rotating shaft by a bolt , and the end of the cooling hole is closed by the closing member. A clamper base integrated with the rotor end ring is attached to the outer periphery of the rotor , a groove is provided in the inner periphery of the cooling hole of the rotating shaft, and a pipe is inserted into the cooling hole of the rotating shaft from the fixed side. A rotor cooling structure for a rotating electric machine, wherein a cooling medium flowed in is turned back from the closed end side of the cooling hole and is allowed to flow between the cooling hole and the pipe. The closing member is provided with a communication hole that penetrates in the radial direction and communicates with the cooling hole of the rotating shaft, and the clamper base has a communication hole with a closed end that communicates with the communication hole, and the cooling hole and the communication hole. 2. The rotor cooling structure for a rotating electric machine according to claim 1 , wherein the cooling medium is caused to flow through the communication hole of the clamper receiving member via the first and second members.

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