JP2003189544A - Dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo-electric machine in which cooling characteristics and reliability are enhanced while facilitating the assembling work by improving the fan guide structure. <P>SOLUTION: The dynamo-electric machine comprises a stator core 7 having a stator winding 9 and a stator cooling duct 11, a frame 1 having intermediate plates 2 and an axial arm 3 for securing the stator core 7 to the frame 1, a rotor core 6 having a rotor winding, a bracket 2 for supporting the stator at the opposite sides in the axial direction of the frame while containing the stator core 7 and the rotor core 6 in the frame, a cooling fan 5 performing ventilation by rotating together with the rotor shaft 4, and a ventilation box 10 for cooling wherein a fit spacer 8 is also provided with fan guide characteristics by securing the fit spacer 8 fixed to the stator winding 9 to an upper part of the cooling fan 5 and securing the opposite end parts of the stator core 7 by means of the intermediate plates 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rotary electric machine.

[0002]

2. Description of the Related Art A rotary electric machine has a stator and a rotor, and these are relatively rotated. By the way, the stator and the rotor generate heat due to copper loss or iron loss. Therefore, by attaching a fan to the rotor and rotating the fan together with the rotor, a flow of a cooling medium such as air is created inside to suppress heat generation. In particular, focusing on cooling the coil end, a guide has been arranged outside the cooling fan. Such a technique is described, for example, in Japanese Utility Model Publication No. 61-93363.

[0003]

However, in the above-mentioned prior art, in particular, the guide impedes the flow of the cooling medium, and rather reduces the cooling efficiency.

An object of the present invention is to provide a rotating electric machine capable of improving cooling efficiency.

[0005]

In order to achieve the above object, according to the present invention, a stator core, a stator winding provided on the stator core, and a stator core facing the stator core are rotated. A rotor core, a rotor winding provided on the rotor core, a fan rotating with the rotor core, and a fit spacer provided on the stator winding, and the fit spacer is cooled by the cooling unit. It was configured to mount on the outer extension of the fan.

Alternatively, a stator core, a stator winding provided on the stator core, a rotor core that rotates in opposition to the stator core, a fan that rotates together with the rotor core, and It has a fit spacer provided in the stator winding, and the fit spacer and the fan are arranged so as to be overlapped in the radial direction.

Alternatively, a stator core, a stator winding provided on the stator core, a rotor core that rotates in opposition to the stator core, a fan that rotates together with the rotor core, There is a fit spacer provided on the stator winding, and the fit spacer is arranged near the fan.

Alternatively, it has a frame, a stator core having a stator winding and a stator cooling duct, and an intermediate plate and an axial arm are provided on the frame for fixing the stator core to the frame, A rotor core having a rotor winding and a rotor cooling duct; a bracket supporting the rotor on both axial sides of the frame in a state where the stator core and the rotor core are housed in the frame; The cooling fan has a cooling fan that rotates together with the rotating shaft of the child to allow ventilation, and a fan guide that guides the cooling fan. A fit spacer is attached to the stator winding as an outer peripheral portion of the cooling fan.

[0009]

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

The present embodiment relates to a rotary electric machine, and by improving the fan guide structure, the cooling performance and reliability of the rotary electric machine can be improved. In order to make this easier to understand, a reference example will be described first.

As a reference example, FIG. 3 shows a structure of a longitudinal sectional view of a rotating electric machine, and FIG. 4 shows details of a structure of a fan guide portion.

A stator core 7 having a stator winding 9, a frame 1 having an intermediate plate 2 and an axial arm 3 for fixing the stator core 7 to a frame 1, a rotor winding 9 and a rotor. An intermediate plate (bracket) that supports the rotor on both sides in the axial direction of the frame with the rotor core 6 having a duct (rotor cooling duct) 12 and the stator core 7 and the rotor core 6 housed in the frame. 2 and a cooling fan 5 that ventilates by rotating together with the rotor shaft 4 and a ventilation box (cooling ventilation box) 10. A fan guide 13 is provided on the outer peripheral portion of the cooling fan 5 to increase the cooling air volume. The fit spacers 8 are installed and are fitted in the gaps between the adjacent stator windings 9 in order to support both ends of the stator windings 9.

In the structure of this rotating electric machine, a stator core 9 having a stator winding 9 including fit spacers 8 in adjacent windings, and a stator winding 9 and a stator duct (stator cooling duct) 11 are provided. And a frame 1 having an intermediate plate 2 and an axial arm 3 for fixing the stator core 7 to the frame 1.
And rotor winding and rotor duct (rotor cooling duct) 1
2, a rotor core 6 having two, a stator core 7 and a rotor core 6 housed in a frame, an intermediate plate (bracket) 2 for supporting the rotor on both sides in the axial direction of the frame, and a rotor shaft 4 A cooling fan 5 and its fan guides 13, which are made to ventilate by rotating together with it, a ventilation box (cooling ventilation box)
It is composed of 10.

The heat generated by the loss of the stator core 7 and the stator winding 9 generated during the operation of the rotating electric machine is cooled by the cooling air shown by the arrow in FIG. As a result, both end portions of the stator winding 9 are less likely to be cooled by the fan guide 13, resulting in an increase in the temperature of the stator winding 9. Further, since the fan guide 13 is installed close to the stator winding 9,
Fan guide 13 by corona discharge from stator winding 9
Is made of metal, it causes dielectric breakdown of the stator winding 9. Further, in order to prevent dielectric breakdown, it is necessary to separate the stator winding 9 and the fan guide 13 from each other. However, if the distance is separated, the axial length of the frame 1 becomes long, and the size of the entire rotary electric machine becomes large. Will result. In addition, the number of parts increases because the fan guide 13 is installed.

That is, by improving the structure around the fan, it is desirable to improve the characteristics and reliability of the rotating electric machine, facilitate assembly work, and reduce the number of parts.

To this end, in short, a stator core 7 having a stator winding 9 and a stator duct (stator cooling duct) 11, and an intermediate plate 2 for fixing the stator core 7 to the frame 1 And a frame 1 having an axial arm 3,
An intermediate plate (bracket) 2 for supporting the rotor on both sides in the axial direction of the frame in a state where the rotor core 6 having the rotor winding, the stator core 7 and the rotor core 6 are housed in the frame.
In a rotary electric machine constituted by a cooling fan 5 that ventilates by rotating together with the rotor shaft 4, and a ventilation box (cooling ventilation box) 10, a fitting spacer 8 attached to a stator winding 9 is provided as a cooling fan 5. Attached to the outer periphery of
By fixing both ends of the stator core 7 with the intermediate plate 2,
In addition to supporting both ends of the conventional stator winding 9, the fit spacer 8 is also provided with fan guide characteristics.

That is, in what is shown in FIGS. 3 and 4,
A fan guide 13 is attached to the outer diameter side of the cooling fan 5.

Next, a concrete example will be described with reference to FIGS. 1 and 2. The fit spacer 8 is attached to the outer diameter portion of the cooling fan 5, the intermediate plate 2 for fixing the frame 1 and the stator core 7 is fixed at both ends of the stator core 7, and the cooling from the ventilation box 10 is performed. The air intake and the air exhaust are separated by the intermediate plate 2. The details will be described below.

The cooling wind of the rotary electric machine cools the stator winding 9 and the stator core 7 in the flow shown in FIGS. At this time, an axial fan is used as the cooling fan 5, and it is generally known that when the axial fan is provided with a fan guide in the vicinity of the outer diameter portion of the axial fan, the performance of the fan is exhibited. Fitting spacers 8 packed between adjacent windings at both ends of the stator winding 9 are attached to an outer diameter portion near the cooling fan 5 so as to have a fan guide function. Further, by mounting the stator core 7 including the frame 1 and the stator winding 9 by fixing both ends of the stator core 7 with the intermediate plate 2 in the frame 1, the stator core 7 can be connected to the cooling air intake part of the rotating electric machine. Separate the exhaust part. As a result, the cooling air is conventionally cooled only by the cooling air discharged from the cooling fan 5 as shown in FIG. 4, but in the present invention, as shown in FIG.
The inlet air of the cooling fan 5 and the rotor duct 12 passes through both ends of the stator winding 9, whereby both ends of the stator winding 9 are cooled. Further, as a result of the experiment, in the conventional machine structure and the invention structure, the temperature rise at both ends of the stator winding 9 is -5 to-
It has been confirmed to reduce by 10K. As a result, it has been confirmed by experiments that the average temperature rise of the stator winding 9 is reduced by -5K and the cooling performance is improved.

Further, by eliminating the fan guide 13 in the portion close to the stator winding 9, the proof stress against dielectric breakdown is improved, and since it is not necessary to secure the axial space as described above, the rotor shaft (shaft 4), that is, the axial length of the frame 1 can be shortened. As a result, the size of the rotating electric machine can be reduced.

Further, since the fan guide 13 is eliminated, the assembling can be facilitated, the number of parts can be reduced, and the weight of the rotating electric machine can be reduced. In addition, the factor of foreign matter mixing at the time of assembling can be eliminated and the reliability can be improved.

[0022]

As described above, it is possible to improve the cooling characteristics of the rotating electric machine, improve reliability, and facilitate assembly.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotating electric machine.

FIG. 2 is a detailed view of a rotating electric machine.

FIG. 3 is a vertical sectional view of a rotary electric machine according to a reference example.

FIG. 4 is a detailed view of the reference example.

[Explanation of symbols]

1 ... frame, 2 ... intermediate plate, 3 ... axial frame, 4 ...
Rotor shaft, 5 ... Cooling fan, 6 ... Rotor core, 7 ... Stator core, 8 ... Fit spacer, 9 ... Stator winding, 10
… Ventilation box, 11… Stator duct, 12… Rotor duct,
13 ... Fan guide.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shuichi Midorikawa             Hitachi 2-3-1, Saiwaicho, Hitachi-shi, Ibaraki             Engineering Co., Ltd. (72) Inventor Shuji Mizutani             3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Stock Association             Hitachi, Ltd., Hitachi Works (72) Inventor Masanori Matsumoto             Hitachi 2-3-1, Saiwaicho, Hitachi-shi, Ibaraki             Engineering Co., Ltd. (72) Inventor Kenji Takahashi             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center (72) Inventor Shinichi Ozawa             3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Stock Association             Hitachi, Ltd., Hitachi Works F-term (reference) 5H603 AA03 AA12 AA15 BB12 CA01                       CB03 CB19 EE08 EE11                 5H604 AA03 BB13 CC01 DB25 QA06                       QA08                 5H609 BB18 PP02 PP06 PP07 PP09                       QQ02 QQ12 QQ18 RR03 RR21                       RR26 RR30 RR36 RR39 RR42                       RR73 RR75

Claims (8)

[Claims] 1. A stator core, a stator winding provided on the stator core, a rotor core facing the stator core and rotating, and a rotor winding provided on the rotor core. A rotating electric machine comprising a wire, a fan that rotates together with the rotor core, and a fit spacer provided on the stator winding, and the fit spacer is attached to an outer extension of the cooling fan. 2. A stator core, a stator winding provided on the stator core, a rotor core that rotates in opposition to the stator core, and a fan that rotates together with the rotor core.
Having a fit spacer provided on the stator winding,
The rotating electric machine, wherein the fit spacer and the fan are arranged at positions overlapping in the radial direction. 3. A stator core, a stator winding provided on the stator core, a rotor core that rotates in opposition to the stator core, and a fan that rotates together with the rotor core.
Having a fit spacer provided on the stator winding,
The rotating electric machine, wherein the fit spacer is arranged in the vicinity of the fan. 4. The rotating electric machine according to claim 1, wherein the cooling fan is an axial type fan. 5. The rotating electric machine according to claim 4, further comprising an intermediate plate for fixing the stator core and separating intake air and exhaust air of the cooling fan. 6. The rotating electric machine according to claim 5, further comprising a frame for fixing the stator and an axial arm provided on the frame. 7. The rotating electric machine according to claim 6, further comprising a bracket that supports the rotor. 8. A frame, a stator core having a stator winding and a stator cooling duct, wherein an intermediate plate and an axial arm are provided on the frame for fixing the stator core to the frame, A rotor core having a rotor winding and a rotor cooling duct; a bracket for supporting the rotor on both axial sides of the frame in a state where the stator core and the rotor core are housed in the frame; It has a cooling fan that rotates together with the rotating shaft of the rotor to allow ventilation, and a fan guide that guides the cooling fan, and a fitting spacer is attached to the stator winding as an outer peripheral portion of the cooling fan. Rotating electric machine.