JPS5845503Y2 - brushless exciter - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a brushless exciter that is directly connected to the rotating shaft of a synchronous machine such as a turbine generator and rotates, and excites the rotating field winding of the synchronous machine with direct current.

In a brushless exciter, a rotating armature and a rotating rectifier of an AC exciter are fitted and fixed to an exciter shaft, and are directly connected to an end of a synchronous machine shaft for rotation.

The fixed field winding of the AC exciter of this brushless exciter is excited, and the alternating current due to the AC voltage generated in the rotating armature is rectified into direct current by the rotating rectifier, which is then supplied to the rotating field winding of the synchronous machine. .

In this way, the excitation device does not require a slip ring.

A conventional brushless exciter has a side view as shown in FIG. 1, in which the upper half is shown in cross section.

1 is a synchronous machine shaft, 2 is a bearing on the synchronous machine side, and 3 is an in-shaft connection conductor of the synchronous machine, which is connected to the rotating field winding (not shown) at the center of the shaft.

A rising conductor 4 is connected to the in-shaft connecting conductor 3 and extends in the radial direction, and is connected to the main connecting line 5 from the exciter side.

6 is an exciter shaft, and a joint 7 is fixed to one end by shrink fitting.
It is connected to the shaft end of the synchronous machine shaft 1 by a bolt 8.

Reference numeral 9 denotes a bearing of the exciter, which is supported by a bearing stand 10.

11 is an AC exciter, which is configured as follows.

12 is a stator frame, 13 is a field iron core, and a field winding 14 is wound around the field core.

Reference numeral 15 denotes an armature core of the rotor, which is fitted and fixed onto the exciter shaft 6, and is provided with an armature winding 16.

Reference numeral 17 denotes a phase ring that connects the connection wires of each phase coming out of the electric machine winding for each phase.

18 is a rotary rectifier, which is constructed as follows.

19 is a wheel fitted and fixed to the exciter shaft 6, 20
is a plurality of rectifying elements, one of which is attached to a plurality of heat sinks 21 supported by the wheel 19, and connected to a phase connection line 23 from the phase ring 11.

Reference numeral 22 designates a plurality of protective fuses, each of which is attached to the heat sink 21, and is connected to either one side of the positive or negative current collecting ring 25.

25 is a base plate. In high-speed, large-capacity synchronous machines, the directly connected brushless exciter is also larger and longer in the axial direction.

The AC exciter 11 has a longer iron core, and the rotating rectifier 18
And each connection wire also becomes larger in external size due to an increase in current capacity.

As a result, the excitation device must have high mechanical rigidity in order to withstand the increasing centrifugal force and to cope with the increase in vibration due to the increased deflection due to the extension of the shaft length, making it expensive. was.

This is particularly difficult mechanically for high-speed aircraft. In addition, the main connection line 5 from the rotary rectifier 18 needs to be held sufficiently in order to withstand the strong centrifugal force when the current capacity increases at high speeds, which requires a large amount of space in the axial direction. In addition, the joint 7 was fitted, and the longer the axis of the exciter, the longer it became.

This idea makes the joint of the rotating shaft of the exciter an integral fledge part, and the intermediate part from this flange part is made into a spider part to increase the outer diameter and increase the mechanical strength. 7, the exciter is provided with an in-shaft connecting conductor that connects to the in-shaft connecting conductor of the synchronous machine, a rotating rectifier is attached to the other end of the exciter shaft, and the in-shaft connecting conductor of the exciter is The helmet-up conductor from the connecting conductor is installed at the outer end of the rotary rectifier, making it easy to support the connecting conductor from the rotary rectifier to the synchronous machine even if the current capacity is small, and reducing the axial length of the exciter shaft. Shorten 7 to reduce deflection 1 - Reduce vibration L7, lower price -
[also aims to provide a brushless exciter,
ing.

FIG. 2 is a side view showing a cross section of the upper half of a brushless exciter according to an embodiment of the invention.

The exciter shaft 30 is integrally provided with a flange 31 at one end,
It is connected to the shaft end of the synchronous machine shaft 26 by a bolt 8.

The shaft center hole 30a of the exciter shaft 30 has a positive and negative shaft connecting conductor 32 connected to the shaft connecting conductor 27 of the synchronous machine at the shaft joint 28.

Reference numeral 33 denotes a spider portion formed at an intermediate portion from the flange 31 portion, and a plurality of arms 34 are integrally formed or fixed by welding.

A cross section of this spider portion 33 is shown in FIG.

35 is an AC exciter, which is configured as follows.

36 is a stator frame, and 37 is a field core around which a field winding 38 is wound.

Reference numeral 39 denotes an armature core of the rotor, which is fitted and fixed into the spider portion 33, and is provided with an armature winding 40.

39a is a radial ventilation duct.

The mechanical rigidity of the exciter shaft 30 is increased by the spider portion 33 having a large outer diameter.

Therefore, the outer diameter of the armature core 39 can be increased and the core length can be shortened, and the bolts 8 can be installed from the gap between the cross arms 34 and 34, so that the armature part can be attached to the flange 3.
It can be brought closer to the 1st side.

Reference numeral 41 denotes a phase ring that connects connection wires of each phase taken out from the armature winding 40 for each phase.

42 is a rotary rectifier, which is constructed as follows.

Reference numeral 43 denotes support means, and a heat sink 46 is fixed to a support disk 44 fitted and fixed near the shaft end of the exciter shaft 30 by a retaining ring 45 using a shrinkage spring or the like.

A plurality of heat sinks 46 are arranged circumferentially and supported insulatingly.

A plurality of rectifier elements, each made of a diode, attached to the heat sink of a cigarette, for example, and a phase ring 4.
The protective fuses 22, which are attached to the heat sink 46 one by one, are connected to one another by a phase connection line 47 from the first protection fuse 22. -C is connected to -C.

Reference numeral 49 denotes positive and negative rising conductors connected to the other end side of the in-shaft connecting conductor 32 and extending out in the radial direction, and connected by the main connecting line 50.
It is connected to the current collecting ring 48.

The exciter shaft 30 is supported by a bearing 9 on the shaft end side, and this bearing is supported by a bearing stand 10.

Reference numeral 51 is a plywood board of the exciter, and due to the shortening of the length of the exciter shaft 30, the length of the exciter is short and the length is short.

Adhering to the device according to the above-described embodiment, the rotation of the synchronous machine shaft 26 rotates the rotor of the exciter machine and generates an alternating voltage in the armature winding 40 of the alternating current exciter machine 35, and this current causes the phase ring 41, It passes through the phase connection line 47 and is passed through the rectifying element 20.

Typically, the rotary rectifier 42 constitutes a three-phase full-wave rectifier circuit,
The number of parallel rectifying elements 20 in each arm (not shown) is determined by the required current capacity.

The DC current rectified by the rectifying element 20 passes through each protective fuse 22 and is collected in the current collecting ring 50, passes through the rising conductor 49, the in-shaft connection conductors 32 and 27, and flows through the field winding of the synchronous machine to excite it. do.

The armature section of the AC exciter 35 is connected to the armature 3 of the spider section 33.
Cooling air flows from the relatively wide space between the armature core 39
By passing through the radial ventilation duct 39a, the cooling effect is improved compared to the conventional device.

Further, in the rotary rectifying device 42, a space is provided in the circumferential direction between each heat sink 21, and cooling air flows in the axial direction to improve cooling.

In the above embodiment, the phase ring 41 is provided, but it may be omitted depending on the case.

Further, in the above embodiment, the current collecting ring 48 is provided, but if the current capacity is not relatively large and the number of rectifying elements 20 and protective fuses 22 is small, the current collecting ring 48 may be omitted and several protective fuses 22 may be used. Main connection line 50 by connecting fuse 22 minutes to 1
You may also connect it to

Furthermore, although the exciter shaft 30 is supported by a bearing 9 on the shaft end side, the bearing 9 may be omitted if the capacity is relatively small and there is no problem in terms of mechanical strength and vibration.

In the above embodiment, as a means for supporting the rectifying element 20 and the protective fuse 22, the heat sink 46 is insulated from the support disk 44 and the retaining ring 45 is fitted around the outer periphery to support the rectifying element 20 and the protective fuse 22. The ring may be integrated into a wheel shape and serve as a support means for attaching a heat sink.

As described above, according to this invention, the axial length of the exciter is shortened, the deflection is reduced, vibration is reduced, the cooling effect of the AC exciter is improved, and it is possible to cope with higher speed and larger capacity.

By reducing the shaft length, the installation area can also be shortened and the price can be lowered.

Furthermore, since the connection line from the synchronous machine side to the rotary rectifier is an in-shaft connection conductor, a highly reliable connection that can endure mechanically and electrically can be made even if the current capacity increases in a high-speed machine.

[Brief explanation of drawings]

Fig. 1 is a side view showing a conventional flangeless exciter with the upper half shown in cross section, Fig. 2 is a side view showing the upper half of a brushless exciter according to an embodiment of the invention in cross section, and Fig. 3 is a side view showing the upper half of a brushless exciter in cross section. 2 is a cross-sectional view taken along the line ■-... in FIG. 2. 20... Rectifying element, 22... Protective heater, 26
...Synchronous machine shaft, 27...Synchronous machine shaft connection conductor, 3
0... Exciter shaft, 30a... Shaft center hole, 31... Flange, 32... Exciter shaft internal connection conductor, 33...
Spider part, 34... Bracelet, 35... AC exciter,
39... Armature core, 40... Armature winding, 42.
... Rotating rectifier, 43... Support means, 44... Support disk, 45... Retaining ring, 46... Heat sink,
49...Rising conductor. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) It is connected to the shaft end of the synchronous machine shaft by a flange integrally provided at one end, and a plurality of arms are provided radially in the radial direction from this flange part to the middle to form a spider part, and the shaft center hole is connected to the shaft end of the synchronous machine shaft. An armature core is fitted into the outer periphery of the spider section, an armature of an AC exciter with an armature winding attached to the armature core, and an armature of an AC exciter with an armature winding attached to the armature core, and an armature near the other end of the exciter shaft. A plurality of beat sinks are arranged and supported in the circumferential direction by the support means fitted in the heat sink, and a rectifying element is attached to each heat sink to rectify the alternating current of the armature winding of the alternating current exciter into direct current. a rotating rectifier, an in-shaft connecting conductor of the exciter which is inserted into the shaft center hole of the exciter shaft, one end of which is connected to the in-shaft connecting conductor of the synchronous machine, and the other end of which is connected to the other end of the exciter shaft; A brushless exciter including a rising conductor connected to the other end of the exciter shaft in-shaft connecting conductor, extended radially outside the shaft, and connected to the rotary rectifier at an outer end position. (2) A support disk in which the support means is fitted and fixed to the exciter shaft, and a plurality of heat sinks arranged circumferentially on the outer periphery of this support disk with insulators interposed therebetween are fitted and held from the outer periphery. A brushless exciter according to claim 1, characterized in that the brushless exciter comprises a retaining ring.