KR101084354B1

KR101084354B1 - Rotor of generator having damper winding

Info

Publication number: KR101084354B1
Application number: KR20100027713A
Authority: KR
Inventors: 한직현
Original assignee: 삼양전원주식회사
Priority date: 2010-03-29
Filing date: 2010-03-29
Publication date: 2011-11-16
Also published as: KR20110108495A

Abstract

The present invention relates to a rotor of an alternator with a built-in braking winding, and more particularly, to a rotor of an alternator with a built-in braking winding to be welded and installed with an aluminum rod and an aluminum plate.
To this end, the present invention by inserting an aluminum rod into a plurality of slots formed on each pole piece of the main rotor of the generator and by welding by joining the aluminum plate on both ends, while the mounting of the braking winding is electrically and mechanically safe It provides a rotor of an alternator with a built-in braking winding for simpler installation.

Description

Rotor of generator having damper winding

The present invention relates to a rotor of an alternator with a built-in braking winding, and more particularly, a braking winding in which a braking winding installed in the main rotor of the generator can be installed more easily by using aluminum rods and aluminum plates. It relates to a rotor of an alternator.

Generally, various buildings such as hospitals, banks and broadcasting stations are equipped with emergency alternators in case of commercial power failure.

The emergency alternator is a kind of small generator driven by a diesel engine which is an internal combustion engine using fossil fuel as an energy source, and serves to supply the generated electric power to a power facility in a building.

Since the diesel engine driving such an alternator is a reciprocating motor, the torque pulsates in relation to the number of cylinders, which adversely affects the characteristics of the generator.
Therefore, if the generator suddenly changes its load in the rotational operation state, the torque of the diesel engine is pulsating, so the angular velocity is not constant during operation, which causes harmonics in which the phase difference angle of the generator pulsates around the phase difference angle at the average load. By interfering with the electricity system being generated, it supplies low quality electricity to the load power system, and also causes abnormal vibration to the rotor of the generator.

In order to prevent this phenomenon, in order to remove the pulsating harmonics, the current is sensed in the damper winding according to the variation of the phase difference angle of the generator, and the induced magnetic flux of the magnetic field flux is changed according to the variation, causing the phenomenon. As a way to eliminate the pulsating harmonics, the installation of the braking winding should be simpler to install in the main rotor of the generator.

The conventional braking winding has a structure in which a copper conductor is inserted into a slot formed in the iron core of the rotor, and both ends of the conductor are short-circuited by a short circuit. That is, as shown in Fig. 4, after inserting the braking winding 3 'in the form of a rod into the plurality of slots 2' formed in the field core 1 'of the rotor, the braking winding 3' A short circuit ring 4 'for shorting and fixing both ends is separately provided, and then a braking winding 3' is inserted into each hole 7 'formed in the short circuit ring 4' to be assembled.

However, in the conventional assembly of the braking winding, it is difficult to assemble the conductor and the short-circuit ring, since it is not easy to insert the conductor while fitting each conductor in a straight line with each hole of the egg ring.

The present invention has been made in view of the above-mentioned, by inserting an aluminum rod into a plurality of slots formed on each pole piece of the main rotor of the generator, by welding the aluminum plate on both ends, mounting of the braking winding The purpose is to provide a rotor of an alternator with a built-in braking winding that can be installed simply and safely.

In order to achieve the above object, the present invention provides a plurality of slots formed at equal intervals on the outer circumference of the main rotor rotatably fastened to the shaft of the alternator, and an AC rod having a built-in braking winding in which an aluminum rod is inserted into each slot. In the rotor of the generator, an aluminum plate is welded to both ends of the aluminum rods inserted into the slots; The main rotor is composed of a magnetic field field core for the main generator of the cross-sectional structure of the magnetic pole pieces and a field winding for the main generator wound around the field core for the main generator; The plurality of slots provide a rotor of an alternator having a braking winding, wherein the plurality of slots are formed in the outer circumference of the field generator core for the main generator along the longitudinal direction and are formed at equal intervals along the circumferential direction.

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The present invention provides the following effects through the problem solving means described above.

According to the present invention, by inserting the aluminum rod-shaped braking winding in the slot formed on each pole piece of the main rotor and welding the aluminum plate on both ends thereof, the assembly state of the braking winding is safe and securely and electrically It can be made, and the assembly work can be made simple to improve the workability.

1 is an exploded perspective view showing an alternator having a rotor with a braking winding according to the present invention.
2 is a perspective view showing a rotor with a braking winding according to the present invention.
Figure 3 is a perspective view showing the assembled state of the main rotor with a built-in braking winding according to the present invention.
4 is a schematic view showing a rotor provided with a conventional braking winding.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, a rotor armature alternator and a rectifier, which are opposite to the main generator, are directly connected to the same axis of the main generator, and the DC power generated from the alternator and the rectifier is supplied as lead wires on the same axis. The point is to make it easier to install a braking winding on the main rotor of the generator.

First, referring to the accompanying FIG. 1, a configuration of an alternator having a rotor according to the present invention will be described.

The generator of the present invention is an emergency alternator in case of commercial power failure in various buildings such as a hospital, a bank, and a broadcasting station, and has a frame assembly 23 having a predetermined volume as a housing, and detailed configurations of the generator are included therein. Intensively installed, the upper end of the frame assembly 23 is integrally formed with a terminal box assembly 26, in which the terminal board assembly 29 and the automatic voltage regulating device 30 (AVR) are installed.

In addition, a fan 8 is coupled to one end of the shaft 9, which is a rotating shaft of the generator, and the damper plate 1 is coupled to the fan 8 by a spacer 6 and a coupling 7. The damper plate 1 is assembled with a plurality of bolts 2 and 4 and washers 3 and 5.

In addition, the main rotor 10 is mounted to the middle portion of the shaft 9, and the exciter rotor 11 is mounted to the other end of the shaft 9, so that the main rotor 10 and the exciter rotor 11 are mounted. Is coaxially parallel to the shaft 9 and is rotatably assembled.

In particular, the main rotor 10 is composed of a field generator core (10a) for the main generator having a cross-sectional cross-sectional structure, and a field winding for the main generator (10b) wound around the main generator field core (10a), the excitation The rotor 11 is composed of an excitation armature core 11a and an excitation armature winding 11b.

Further, after the exciter rotor 11, a rectifier 12, which is a diode assembly, is installed on the shaft 9, and a bearing 13 is assembled at the end of the shaft 9.

At this time, the rectifier 12 serves to convert the three-phase AC power generated from the exciter rotor 11 into a direct current to supply the field winding for the main generator 10b of the main rotor 10 through a lead wire.

Meanwhile, a main stator assembly 22 corresponding to the outer diameter of the main rotor 10 is installed inside the frame assembly 23 having the cylindrical housing structure, and an excitation corresponding to the outer diameter of the exciter rotor 11 is provided. The stator 31 is installed.

In addition, a flange adapter 14 and a fan cover 17 are assembled on one side of the frame assembly 23 to cover the fan 8, and an exciter stator 31 is provided on the other side of the frame assembly 23. An end bell 34 for fixing is assembled.

More specifically, a plurality of support bosses 40 are integrally formed on the inner surface of the end bell 34 so that the exciter stator 31 is assembled and fixed to the support bosses 40 by bolts.

2 and 3, the magnetic pole pieces of the main rotor 10, that is, the outer peripheral portion of the magnetic field core 10a for the main generator having a cross-sectional cross-section, are pierced along the length direction and circumferentially. A plurality of slots 50 formed at equal intervals are formed along each side, and the aluminum rods 52, which are braking windings, are inserted into the slots 50.

Subsequently, the aluminum plates 54 are brought into close contact with both ends of the aluminum rods 52 exposed at both ends of the slot 50, and then the aluminum rods 52 and the aluminum plates 54 are coupled to each other by welding. .

The braking winding of the shape of the aluminum rod 52 is inserted into the slot 50 of the main rotor 10, and then the aluminum plate 54 is attached to both ends by welding, so that the assembled state of the braking winding is electrically and It can be made mechanically safe and robust, and in particular, assembling work is simple, thereby improving workability.

In addition, since the diesel engine of the alternator is a reciprocating type prime mover, if the generator suddenly changes its load depending on the number of cylinders, the torque of the diesel engine is pulsated, so the angular speed is not constant during operation. Therefore, if harmonics in which the phase difference angle inside the generator pulsates around the phase difference at the average load is generated, the current of the damper winding fluctuates according to the change in the phase difference angle of the generator, thereby changing the induced magnetic flux of the field flux to pulsate. Since the harmonics are removed, the braking control of the generator is smooth and the abnormal vibration occurring in the rotor of the generator can be prevented.

1: damper plate 2, 4: bolt
3, 5: washer 6: spacer
7: coupling 8: fan
9: shaft 10: main rotor
10a: field core for main generator 10b: field winding for main generator
11: Excitation rotor 11a: Electromagnetic core for exciter
11b: armature winding for women 12: rectifier
13: bearing 14: flange adapter
17: fan cover 22: main stator
23: frame assembly 26: terminal box assembly
29: terminal board assembly 30: automatic voltage regulator
31: female stator 34: end bell
40: support boss 50: slot
52: aluminum rod 54: aluminum plate

Claims

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Braking windings in which a plurality of slots 50 are formed at equal intervals on the outer circumference of the main rotor 10, which is rotatably fastened to the shaft 9 of the alternator, and the aluminum rods 52 are inserted into the slots 50. In the rotor of this built-in alternator,
An aluminum plate 54 is padded and welded to both ends of the aluminum rods 52 inserted into the slots 50;
The main rotor (10) is composed of a field generator core (10a) for the main generator having a cross-sectional cross-section structure as a magnetic pole piece and a field winding (10b) for the main generator wound around the field generator core (10a) for the main generator;
The plurality of slots (50) is a rotor of the alternator with a built-in braking winding, characterized in that formed through the longitudinal direction at the outer peripheral portion of the field generator core (10a) for the main generator at equal intervals along the circumferential direction.