JPH0424782Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a generator for a welding machine that can simultaneously utilize welding power and general AC power.

[Conventional technology]

When performing electric welding at construction sites, etc., it is essential to have a generator for the welding machine that has both a power source for welding and a commercial frequency AC power source to power lights, grinders, submersible pumps, etc. ing.

As a conventional technology for this type of generator, JP-A-58-
As described in the specification of No. 53373, a control pole is provided between the main magnetic poles, and this control pole has a polarity opposite to that of the main magnetic pole to actively generate the third harmonic. There is.

[Problem that the invention attempts to solve]

However, such conventional technology has significant disadvantages in that the structure is complicated, the product is expensive, and it is impractical.

The present invention was developed in view of the above-mentioned conventional technology, and the purpose of the present invention is to actively extract the third harmonic and suppress fluctuations in the output voltage on the AC power supply side due to fluctuations in the load on the welding side. The object of the present invention is to provide a practical generator for a welding machine.

The second object is to provide a generator for a welding machine that can obtain the best value of the third harmonic as a welding power source and minimize distortion of the voltage of the AC power source.

[Means for solving problems]

Therefore, in the present invention, rectified voltage is supplied to the first armature winding that takes out the power source for welding, the second armature winding that takes out the general commercial AC power source, and the field winding of the rotor. In the generator for a welding machine, the first armature winding is a polyphase winding. At the same time, the second armature winding and the excitation winding are wound around the armature as single-phase windings, and this field is applied to the center part of the magnetic pole head of each field pole forming the N pole and the S pole. When a through hole is drilled in a direction perpendicular to the direction of rotation of the magnetic poles, and a field winding is wound around each of the N and S poles in the gap between the N and S poles of the rotating iron core. This aims to achieve the above objective.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a schematic diagram of a rotating field type AC generator 2 showing an embodiment of the present invention, and the generator 2 is composed of a stator 4 and a rotor 6. As shown in FIG.

The stator 4 includes armature windings 8, 10, 12, 14 for extracting electromotive force as a generator,
Excitation windings 16 are wound respectively. Among these, the armature winding 14 is generally 100V or 200V
The armature windings 8, 10, and 12 are two-pole windings used as a commercial power source.
As shown in the figure, a three-phase AC power supply U for welding,
This is a six-pole winding used as V and W (in Figure 1, only the U-phase winding 8 is shown, and the other V-phase and W-phase windings 10 and 12 are omitted). ).

The armature windings 8, 10, 12 are in-phase windings 8A, 8B, 8C (U phase), 1 wound with a phase difference of 120 degrees, as shown in FIGS. 2 and 3.
0A, 10B, 10C (V phase), 12A, 12B,
12C (W phase) are connected in series, thereby making it possible to extract a higher voltage for welding. By the way, since the welding power source uses the third harmonic, the armature reaction due to the welding current affects the third harmonic in the air gap magnetic flux distribution, resulting in an air gap magnetic flux distribution that does not contain much third harmonic, so the voltage droops. However, since this has almost no effect on the total amount of magnetic flux, an AC power source that generates a voltage that is approximately proportional to the total amount of magnetic flux has a substantially constant voltage.

On the other hand, a field winding 18 for exciting the field pole 6A is wound around the rotor 6 with a coil guide 20 in between, and the voltage obtained by the excitation winding 16 is rectified. Later, this field winding 18
It is now being supplied to In addition, the rotor 6 is provided with a through hole 22 orthogonal to the rotational direction as shown in the figure in the center of the magnetic pole head of the same field pole, which allows third harmonics to be generated in the magnetic flux. Through hole 2 can contain a large amount of ingredients.
2 is not provided (see waveform 30 shown in Figure 6)
Compared to this, the amplitude of the voltage induced in the welding winding becomes larger, making it possible to increase the output on the welding side (see waveform 32 shown in FIG. 6). In contrast,
The single-phase voltage obtained in the armature winding 14 is
2, the third harmonic component will be included in a relatively large amount (waveform 3 shown in Figure 6).
4), and unlike home use, it has little impact on equipment, etc. at construction sites. However, Figure 4(1)
It is undesirable for the distortion to become large as shown in the solid line voltage waveform shown in FIG.

Therefore, if the shape and position of the through hole 22 are determined by taking into account various circumstances such as the distortion rate of the commercial power source and the output of the welding power source and the output of the commercial power source requested by the user, it will be sufficiently practical. It is possible to provide a generator for a welding machine.

In other words, by providing the through holes 22 in the positions shown in Figures 1 to 4 (2), the third harmonic component in the magnetic flux can be made to the best value, and the voltage on the commercial power supply side can be reduced. Less distortion (see dotted line in Figure 4 (1)),
Further, the output on the welding side and the output on the commercial power source side can be matched with what the user desires. In other words, there is no need to adopt a complicated configuration as shown in the prior art to control the third harmonic component in the magnetic flux. Furthermore, if the shape of the present invention is adopted, the unevenness of the surface of the rotor 6 will be reduced, so windage loss can be significantly reduced.

Next, the electrical configuration of the generator 2 is shown in FIG.

As shown in the figure, the single-phase AC voltage obtained from the armature winding 14 is directly used as a commercial 100V or 200V AC power source, while the single-phase AC voltage obtained from the armature windings 8, 10, and 12 The third harmonic voltages U, V, and W of the phases are rectified through a three-phase full-wave rectifier 24 and used as a power source for welding.

Moreover, the single-phase voltage obtained by the excitation winding 16 is
It is rectified via a single-phase full-wave rectifier 26, adjusted by a welding regulator 28, and then supplied to the field winding 18.

[Effect of idea]

As described above, according to the present invention, since a large through hole is bored in the middle part of the same field pole, there is no unnecessary unevenness on the surface of the rotating iron core, so windage loss during rotation can be significantly reduced. I can do it. Furthermore, since the third harmonic can be actively taken out, there is provided a generator for a welding machine that exhibits an excellent effect in that the output voltage on the AC power supply side hardly changes due to fluctuations in the load on the welding side. be able to.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
4 is an explanatory diagram showing the first armature winding of the generator shown in FIG. 1, FIG. 3 is a developed view showing the first armature winding, and FIG. Explanatory diagram for showing the voltage waveform induced in the armature winding of
The figure is an electrical configuration diagram of the generator shown in FIGS. 1 and 2, and FIG. 6 is an explanatory diagram showing the voltage waveform obtained by the present invention. 6A... Field pole, 8, 10, 12... First armature winding, 14... Second armature winding, 22...
Through hole.

Claims (1)

[Claims for Utility Model Registration] A first armature winding that takes out a power source for welding, a second armature winding that takes out a general commercial AC power source, and a rectified voltage in the field winding of the rotor. an armature wound with an excitation winding that supplies
In the generator for a welding machine, the first armature winding is a polyphase winding, and the second armature winding and the excitation winding are The wire is wound around the armature as a single-phase winding, and the N pole and S
A through hole is bored in the center of the magnetic pole head of each field pole forming a pole in a direction perpendicular to the rotation direction of the field pole, and each N pole is inserted in the gap between the N pole and S pole of the rotating iron core. and a generator for a welding machine, characterized in that a field winding is wound around the south pole.