JPH06261499A - Electric rotating machine - Google Patents

Abstract

PURPOSE:To provide a large scale, totally-enclosed, internally cooled electric rotating machine, e.g. a turbine generator, in which overall length (shaft length) is shortened and the weight and dimension of unit component are reduced. CONSTITUTION:A stator frame 12 for generally supporting a stator core 1 and a coil 2 is a unit component having substantially same length as the stator core 1. A suction zone is constituted by disposing a coil cover 13 surrounding the protruded part of the stator coil 2, an exhaust duct 14 fixed to the side face of the stator frame 12 with air coolers 15 being loaded to the opposite sides, and an end cover 16 surrounding a bearing unit 10. Since unit components are disposed along a ventilation circuit, weight and dimensions of largest component can be decreased and since the shaft length is shortened, improved effect can be realized in the aspect of vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for assembling a large-sized rotating electric machine such as a turbine generator, and more particularly to a fully closed internal cooling type rotating electric machine having a cooler around a stator.

[0002]

2. Description of the Related Art FIG. 5 is a cross-sectional view of a general rotating electric machine that has been conventionally used. In the figure, 1 is a stator core, 2 is a stator coil, 3 is a stator frame, 3a, 3b
Are exhaust holes and intake holes provided in the stator frame. 4 is an air cooler provided on both sides around the stator frame 3 for cooling a cooling medium (cooling air) circulating in the machine, and 5 is a ventilation exhaust connecting the air coolers 4 on both sides with the exhaust hole 3a. The duct, 6 is a ventilation intake duct connecting the air cooler 4 and the intake hole 3b. 7 is an end plate, 8 is a rotor, 9 is a rotor 8
Is a fan attached to the bearing, 10 is a bearing device arranged outside the end plate 7, and 11 is a base plate of this bearing device.

In the cooling circuit of the rotating electric machine as described above, cooling air circulates in the rotating electric machine by the rotation of the fan 9 attached to the rotor 8 as shown by the arrow in the figure.

[0004]

In the conventional rotary electric machine as described above, since the stator frame 3 is integrated in the axial direction, a large-capacity machine has a large weight and size. Therefore, there is a problem that the transportation cost becomes huge. Further, since the end plate 7 is provided between the bearing device 10 and the stator frame 3, there is a drawback that the axial length becomes long, and the base plate 11 is also enlarged to increase the axial rigidity of the bearing device 10. I had to.

The present invention has been made in order to solve the above problems. The stator frame of a rotary electric machine is minimized in weight and size, and the shaft length is shortened to improve the rigidity of the bearing device. The purpose is to improve and improve vibration.

[0006]

A rotating electric machine according to the present invention includes a stator frame having a length of a stator core, an exhaust duct connecting the stator frame and an air cooler, and a wire ring. An intake zone is formed by a wire ring surrounding the end portion and an end cover surrounding the bearing device.

[0007]

The ventilation circuit of the rotating electric machine according to the present invention comprises a stator frame and an exhaust duct having substantially the same length as the stator core, a wire ring enclosure, and end cover parts, and the end cover is a bearing device. Since the stator frame is also included, the weight and size of the stator frame can be reduced, and the axial length, that is, the length of the rotating electric machine can be shortened.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a plan sectional view and a side sectional view of an embodiment of the present invention. In the figure, 12 is a box-shaped stator frame arranged around the stator core 1 and set to have substantially the same length as the stator core 1, and 13 is the stator frame 12
Is a wire ring enclosure that is attached to the outer side of the inner peripheral part of the fan and surrounds the stator wire wheel 2 and also serves as a ventilation guide for the fan 9. 1
2a is an exhaust hole provided on the side surface of the stator frame 12,
Reference numeral 14 is an exhaust duct attached to the outside of the stator frame 12 along the exhaust hole 12a, and air coolers 15 are arranged at both outlets of the exhaust duct. Reference numeral 16 denotes an end cover that is attached to the outside of the outer peripheral portion of the stator frame 12 and is disposed so as to cover the air cooler 15 and the wire ring enclosure 13. The end cover 16 is the bearing device 10.
It also surrounds. Further, the base plate 11 for the bearing device and the stator frame 1
It is connected to 2 by a support 17.

The ventilation circuit in the above configuration circulates as indicated by the arrow. The stator in the above embodiment is a stator iron core, a wire ring, and a stator frame that comprehensively supports these and has a length substantially the same as that of the stator iron core, and is a single piece, and is separate from the stator frame. , A wire ring surrounding the protruding portion of the stator wire, an exhaust duct attached to the side of the stator frame and equipped with air coolers on both sides, and an end cover connected to further include a bearing device. The air intake zone is configured by arranging the parts, and each is divided into a single part along the ventilation circuit, so the weight dimension of the largest part can be reduced and at the same time, the axial length can be shortened, improving the vibration surface. The effect is obtained. Further, by connecting the base plate 11 for the bearing device and the stator frame 12 with the support 17, the rigidity of the bearing device support structure can be improved.

Embodiment 2. In the above embodiment, the air cooler 15 is arranged on one side, but it may be arranged on both sides as shown in FIG.

Embodiment 3. Further, as shown in FIG. 4, the air cooler 15 may be arranged in the middle of the exhaust duct.

[0012]

As described above, according to the present invention, since the stator frame is configured to have the smallest size, the transportation cost can be reduced and the bearing device is arranged in the end cover. This has the effect of shortening the shaft length.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a rotary electric machine according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the rotary electric machine of FIG.

FIG. 3 is a plan sectional view of a rotary electric machine showing another embodiment of the present invention.

FIG. 4 is a plan sectional view of a rotary electric machine showing another embodiment of the present invention.

FIG. 5 is a side sectional view of a typical example of a conventional rotating electric machine.

[Explanation of symbols]

 1 Stator Core 2 Stator Wire Wheel 10 Bearing Device 11 Bearing Device Base Plate 12 Stator Frame 13 Wire Ring Enclosure 14 Exhaust Duct 15 Air Cooler 16 End Cover 17 Support

Claims (2)

[Claims] 1. A fully-closed internal cooling type rotary electric machine equipped with an air cooler around a stator frame, which comprehensively holds a stator core and a wire ring, is provided with an exhaust hole on a side surface, and has a length of the stator core. A box-shaped stator frame having substantially the same length as that of the exhaust gas, an exhaust duct disposed around the stator frame corresponding to the exhaust holes and having substantially the same length as the stator frame, and air connected to the exhaust duct. The cooler, the wire ring enclosures attached to both ends of the stator frame so as to surround the end portions of the stator wire ring protruding at both ends of the stator frame, a bearing device for supporting the rotor, and this bearing device. And a rotary electric machine provided with an end cover attached so as to include the above-mentioned wire ring enclosure. 2. The rotating electric machine according to claim 1, wherein the stator frame and the base plate of the bearing device are connected by a support.