JP2001178094A - Dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate maintenance and checking of a commutator of an exciting apparatus by reducing shaft vibration of a turbine generator. SOLUTION: A rotor of the exciting apparatus is arranged on the rotor side of one shaft end side of the rotor, and a commutator is arranged in the shaft end part. A bearing is arranged between the rotor and the commutator. Thereby overhung is eliminated, and shaft vibration is reduced. By installing the commutator in the shaft end portion, maintenance and check are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine generator, and more particularly to an arrangement of a brushless exciter.

[0002]

2. Description of the Related Art The structure of a conventional turbine generator using a brushless exciter is disclosed, for example, in US Pat. No. 4,753,315.
There is a configuration disclosed in Japanese Patent Application Laid-Open Publication No. H10-26095. FIG. 4 schematically illustrates this.

In FIG. 4, a rotating shaft 1 is held by a bearing 2 and is connected to a turbine at an end 3 side. 21
Is a generator rotor provided on the rotating shaft 1;
Is the stator of the generator. The rotor winding 23 is the rotor 21
And is fixed to the rotor 21 by a wedge 24 while being installed in a winding slot (not shown) provided on the outer peripheral surface of the motor. The end of the rotor winding 23 extends outside the winding slot, and a holding ring 25 is provided on the outer peripheral side of the rotor to hold this portion.

The exciter 10 comprises a rotor 11 of the exciter, a stator 12 of the exciter and a commutator 13. The rotor 11 and the commutator 13 of the excitation device are installed on the rotating shaft 1, and the stator 12 of the excitation device is fixed so as to face the rotor 11 of the excitation device. The rotating shaft 1 is driven by a turbine to generate an AC voltage on a rotor 11 of an exciting device, which is further converted to DC by a commutator 13 to excite a rotor 21 of a generator, and a stator of the generator. 2
2 to generate a voltage.

[0005]

In recent years, as the capacity of the generator has been increased, it has become necessary to increase the axial length of the rotor 21 and the stator 22. With this, the excitation device 10
Also need to be enlarged. In the structure shown in FIG. 2, the exciter 10 is in an overhanging state, and it has become a major problem to suppress the shaft vibration, and has become a cause of an obstacle to increasing the capacity.

On the other hand, an example in which the excitation device 10 is installed between the bearing 2 and the rotor 21 of the generator body with respect to the above-mentioned problem is disclosed in, for example, Japanese Patent Application Laid-Open Nos.
In the official gazette. In these, a rotor 11 of the exciter, a stator 12 of the exciter, and a commutator 13 are provided between the two bearings 2. Now, a diode is usually used for the internal commutator 13 of the excitation device.
The need for inspection is high. However, in the above-described known example, since the entire exciter 10 is installed between the bearings 2, it is necessary to remove the rotary shaft 1 for maintenance and inspection, which is extremely inconvenient.

An object of the present invention is to provide a structure which can cope with an increase in the capacity of a generator, suppresses shaft vibration, and facilitates maintenance and inspection of an exciting device.

[0008]

That is, the present invention is directed to an axial winding of a rotor and an outer peripheral surface of the rotor which is circumferentially spaced on both sides of a magnetic pole portion of the rotor. A slot, a rotor winding disposed concentrically with respect to the magnetic pole, extending outside the winding slot and the winding slot, and alternately stacking a conductor and an insulating material; and A wedge for fixing the rotor winding to the rotor,
A rotating electric machine comprising: a rotor ring on a rotor outer peripheral side of a rotor winding extending outside the winding slot at both ends of the rotor; wherein an exciter is provided on the rotor side on one shaft end side of the rotor. The above problem is solved by arranging a commutator at the shaft end of the rotor and arranging a bearing between the rotor and the commutator.

[0009]

1 to 3 show one embodiment of the present invention. FIG. 1 shows a cross section of the generator, and FIG.
Similarly, the rotating shaft 1 is held by the bearing 2. 2
Reference numerals 1 and 22 denote a rotor and a stator of the generator, respectively.
The central portion of the rotor winding 23 is installed in a winding slot (not shown) provided on the outer peripheral surface of the rotor 21, and is fixed by a wedge 24. The end of the rotor winding 23 extending outside the winding slot is fixed by a retaining ring 25.

The cooling is performed by circulating the gas cooled by the gas cooler 31 through the fan 32 mounted on the rotating shaft 1. The exciting device includes a rotor 11 of the exciting device installed on the rotating shaft 1, a stator 12 of the exciting device fixed to the rotating device 1, and a commutator 13 installed on the rotating shaft 1. In this embodiment, the rotor 11 of the excitation device and the stator 12 of the excitation device of the excitation device 10 are placed between the bearings 2 in parallel with the rotor 21 of the generator, and the commutator 13 is provided outside the bearing 2. Have been placed.

By arranging the bearing 2 between the rotor 11 and the commutator 13 of the exciter in this way, the overhang of the exciter is eliminated, and the weight is arranged between the bearings to reduce the shaft vibration. At the same time, by arranging the commutator 13 on the shaft end outside the bearing 2, maintenance and inspection of the commutator can be easily performed without removing the rotating shaft from the bearing.

FIG. 2 shows another embodiment of the present invention, in which a bearing 2b is further provided between the rotor of the generator and the rotor of the exciting device as compared with FIG. This configuration is effective when the shaft length of the rotor portion of the generator is longer. This configuration reduces shaft vibration, and at the same time, the commutator is located at the shaft end, so that maintenance and inspection are easy. It has the feature of.

Although it is necessary to cool the excitation device 10, FIG. 3 shows an embodiment of the cooling of the excitation device according to the present invention. As described above, the cooling gas cooled by the gas cooler 31 is driven by the fan 32. A part of the cooling gas is passed through a duct 41 to the rotor 11 of the excitation device and the stator 1.
2 to the upstream side 51 and, after cooling, from the downstream side 52 to the duct 4
It may be returned to the upstream side of the gas cooler 31 by 2.

[0014]

According to the present invention, the overhang of the exciter is eliminated and the weight portion is shifted between the bearings, so that the shaft vibration can be reduced and the commutator of the exciter can be easily maintained and inspected.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a generator structure using a brushless excitation device of the present invention.

FIG. 2 is a sectional view showing another embodiment of the generator structure using the brushless excitation device of the present invention.

FIG. 3 is a sectional view showing an embodiment showing a cooling method of a generator structure using the brushless excitation device of the present invention.

FIG. 4 is a cross-sectional view of a generator structure using a conventional brushless excitation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 2 ... Bearing, 3 ... Turbine side rotating shaft end part, 1
0: Exciter, 11: Exciter rotor, 12: Exciter stator, 13: Commutator, 21: Generator rotor, 2
2 ... generator stator, 23 ... rotor winding, 24 ... wedge, 25 ... holding ring, 31 ... gas cooler, 32 ... fan,
41, 42 ... duct, 51 ... upstream side of the excitation device, 52 ...
Downstream of the exciter.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryoichi Shiobara 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Works, Ltd. (72) Kenichi Hattori 3-1-1, Sachimachi, Hitachi-shi, Ibaraki No. 1 F Term in Hitachi, Ltd. Hitachi Works (reference) 5H605 AA04 BB01 CC03 CC04 DD38 EA01 EA20 5H619 AA10 BB02 PP02 PP21 PP22 PP38

Claims (1)

[Claims] An axial winding slot on an outer peripheral surface of a rotor, which is circumferentially spaced on both sides of a rotor and a magnetic pole portion of the rotor, and is concentric with the magnetic pole. And a rotor winding extending outside the winding slot and the winding slot, wherein a conductor and an insulating material are alternately laminated. And a holding ring on the outer periphery of the rotor of the rotor winding that extends out of the winding slot at both ends of the rotor. A rotating electric machine, wherein a rotor of an excitation device is arranged on a rotor side, a commutator is arranged at an end of a shaft, and a bearing is arranged between the rotor and the commutator.