JPH05300700A - Cooling apparatus for brushless exciting equipment - Google Patents

Abstract

PURPOSE:To provide a cooling apparatus which performs more intensified cooling for a brushless exciting equipment by adding a ventilating path for cooling a subexciter and a ventilating path for cooling a rotary rectifying element, in the brushless exciting equipment. CONSTITUTION:A fixed ring 9 is extended and a space is formed between an inner surface of a hollow shaft 2 and an outer surface of the fixed ring 9. An axial fan 12 is installed at the hollow shaft 2 side in the space. At an end of a generator shaft 1, an extended shaft 14 is installed which comes into the inside of the fixed ring 9 and is provided with a radial fan 13 so installed as to face a rotary rectifying element 6 across the fixed ring 9. And, a ventilating hole 15 is formed in a fixed plate 8 to lead cooled gas into the inside of the fixed ring 9 and the plurality of ventilating holes 16 are so formed in the fixed ring 9 as to face the rotary rectifying element 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless exciter for a rotary electric machine, and more particularly to a cooling device therefor.

[0002]

2. Description of the Related Art A brushless exciter is one of devices for supplying a field current to a field winding of a rotating field type electric rotating machine. FIG. 4 shows a structural diagram of the brushless excitation device of the turbine generator. The hollow shaft (2) is directly connected to the generator shaft (1), and the AC exciter armature (3) is fixed to the outer diameter side thereof. An AC exciter magnetic pole (5) having a plurality of magnetic pole pieces in which a field winding is wound around an iron core is attached to the frame (4). The alternating current exciter armature (3) and the alternating current exciter magnetic pole (5) constitute a rotating armature type alternating current exciter. Further, a plurality of rotary rectifying elements (6) are attached at positions close to the AC exciter armature (3).
By the rotary rectifying element (6), the AC output of the AC exciter is converted into DC and supplied to the field winding of the generator. Further, a sub-exciter magnetic pole (7) having a plurality of permanent magnets is attached to the inner diameter side of the hollow shaft (1). On the other hand, the auxiliary exciter armature (10) is fixed to the outer diameter side of the fixing ring (9) attached to the fixing plate (8). The auxiliary exciter magnetic pole (7) and the auxiliary exciter armature (10) constitute an auxiliary exciter, and the output thereof is supplied to the field winding of the alternating-current exciter magnetic pole (5). The cooling air volume is supplied from the generator main body, and the ventilation path is the space between the fixed plate (8) and the frame (4) from the bottom of the brushless exciter as shown by the solid line, and the space between the fixed plate (8) and the windbreak plate (11). And cool each part.

[0003]

In the above cooling, only a part of the auxiliary exciter is cooled, and the cooling of the rotary rectifier is insufficient.

The present invention has been made in view of the above points,
An object of the present invention is to provide a cooling device for a brushless exciter having a high cooling effect by forming a ventilation path for cooling the sub exciter or the rotary rectifying element.

[0005]

In order to achieve the above object, according to the present invention, in cooling the sub-exciter, in the space between the hollow shaft and the fixed ring, the axial direction is directed toward the inner diameter side of the hollow shaft. An axial fan that allows cooling gas to pass through is provided, and a ventilation hole for introducing cooling gas into the fixing ring is provided in the fixed plate. For cooling the rotary rectifying element, an extension shaft equipped with a radial fan that penetrates into the fixed ring and passes cooling gas in the radial direction at the position facing the rotary rectifying element across the fixed ring is provided at the generator shaft end. In addition to the fixed plate ventilation holes, ventilation holes for passing cooling gas to the rotary rectifying element are provided in the fixed ring.

[0006]

By doing so, the space between the fixing plate ventilation hole, the fixing ring and the hollow shaft-the axial fan-
A ventilation path passing through the sub-exciter is formed, and a ventilation path passing through the fixed plate ventilation hole-radial fan-fixing ring ventilation hole-rotational rectification element is formed, cooling of the sub-excitation machine and the rotation rectification element is enhanced, The reliability of the brushless exciter during operation is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a structural view of the present invention, which differs from the conventional structure shown in FIG. 4 in that the fixing ring (9) is extended so that it is between the inner diameter side of the hollow shaft (2) and the outer diameter of the fixing ring (9). A space is secured in the space, an axial fan (12) is attached to the hollow shaft (2) side in the space, and the end of the generator shaft (1) enters into the fixing ring (9) to fix the fixing ring (9). ), An extension shaft (14) provided with a radial fan (13) is attached at a position facing the rotary rectifying element (6), and cooling gas is further supplied to the fixing plate (8) in the fixing ring (9). The fixing plate ventilation hole (15) for guiding and a plurality of fixing ring ventilation holes (16) are provided at positions facing the rotary rectifying element (6) of the fixing ring (9). The extension shaft (14) is a space in which the radial fan (13) is installed at a position facing the rectifying element (6) across the fixing ring (9) by gradually reducing the shaft diameter at a certain angle from the front of the fixing ring. It has a structure that can secure.

2 and 3 show a side view and a front view of the radial fan and the vicinity of each ventilation hole. The blades (13a) of the radial fan are fixed from both sides by two blade fixing plates (13b) having the same structure. The blade fixing plate (13b) has a structure having a ventilation space for the purpose of passing the cooling gas to the auxiliary exciter and for the purpose of introducing the cooling gas to the rotary rectifying element (6).

With such a configuration, in addition to the conventional ventilation path shown by the solid line in FIG. 4, the fixed plate ventilation hole-fixing ring and the space between the hollow shafts shown by the chain line in FIGS. 1 to 3-axial fan -Ventilation path for cooling the sub-exciter passing through the sub-exciter and fixed plate ventilation hole shown by double line-Radial fan-fixed ring ventilation hole-ventilation path for cooling rotary rectifying element passing through rotary rectifying element The cooling of the brushless exciter can be enhanced.

[0010]

As described above, according to the present invention, the cooling effect of the auxiliary exciter and the rotary rectifying element, which have not been sufficiently cooled in the past, is improved, the cooling of the brushless exciter is strengthened, and the brushless operation is performed. The reliability of the exciter is improved.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a brushless excitation device according to an embodiment of the present invention.

FIG. 2 is an enlarged side view showing the radial fan of FIG. 1 and the vicinity of each ventilation hole.

FIG. 3 is an enlarged front view showing the radial fan of FIG. 1 and the vicinity of each ventilation hole.

FIG. 4 is a structural diagram showing a conventional brushless excitation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Generator shaft 2 ... Hollow shaft 3 ... AC exciter armature 4 ... Frame 5 ... AC exciter magnetic pole 6 ... Rotating rectifying element 7 ... Sub-exciter magnetic pole 8 ... Fixed plate 9 ... Fixed ring 10 ... Sub-exciter electric machine Child 11 ... Windproof plate 12 ... Axial fan 13 ... Radial fan 13a ... Blade 13b ... Blade fixing plate 14 ... Extension shaft 15 ... Fixed plate ventilation hole 16 ... Fixed ring ventilation hole

Claims (2)

[Claims] 1. An AC exciter comprising a rotating armature fixed to the outer diameter side of a hollow shaft directly connected to a field rotor of a main rotating electric machine and a static field magnetic pole, and rotating on the same axis as the field rotor. In the brushless exciter, a hollow rectifying device comprising: a rotary rectifying element fixed to a rotating portion; a rotating field pole fixed to a rotating portion on the same axis as the field rotor; A cooling device for a brushless exciter, characterized in that an axial fan that allows cooling gas to pass through in the axial direction is provided on the inner diameter side, and a ventilation hole is provided in a fixing plate that fixes the sub-exciter armature. 2. A ventilation ring is provided in a fixing plate and a fixing plate for fixing an extension shaft and a sub-exciter armature, the extension shaft having a radial fan for passing a cooling gas in a radial direction attached to a field rotor shaft end of the main rotating electric machine. The cooling device for a brushless exciter according to claim 1.