JP2000134889A - Engine-welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set an average voltage, when output is not loaded to a high voltage within a standard value, to set a peak voltage to a high level, and to obtain superior arc characteristics even if a reactor is small. SOLUTION: An engine-welding machine that is provided with a stator 3 where main welding coil winding 1 and auxiliary welding coil winding 9 are wound and a protrusion-pole-type field rotor 12, and superposes the rectification voltages of both of them, the protruded-pole type field rotor 12 is in the structure of a pseudo hexapole-dipole rotor, the main welding coil winding 1 has coil winding structure, where each coil winding with three phases is dispersed to an entire slot so that voltage with an output frequency due to the pseudo 6 poles of the projection-pole-type field rotor 12 is generated, the auxiliary welding coil winding 9 is in a coil-winding structure, in which a single-phase voltage is generated by the output frequency due to the 2 dipole of the protruded-pole type field rotor 12 on loading, and the single-phase voltage of the auxiliary welding coil winding 9 is subjected to full-wave rectification by a full-wave rectifier 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an engine welding machine,
In particular, the frequency of the voltage generated in the auxiliary welding winding with respect to the frequency of the voltage generated in the main welding winding is reduced, for example, to 1/3, and the single-phase voltage of the auxiliary welding winding is subjected to full-wave rectification. Superimposed on the DC voltage on the main welding winding side, the average voltage at no output load can be set to a high voltage within the specified standard value, and even if the peak voltage is high and the reactor is small, good arc characteristics can be obtained. It relates to the engine welder obtained.

[0002]

2. Description of the Related Art Portable engine welding machines are required to be small and lightweight. Therefore, for the required welding output, the drive engine (engine output) and the size of the electric generator are usually set to near limits. Further, since the reactor is also a portable engine welding machine, its size is limited and cannot be increased. In this case, it is conceivable to increase the no-load voltage. However, increasing the no-load voltage causes the following problem.

[0003] There is a margin in if electrostatic onset machine physique, even if the set so as to give the desired no-load voltage V ₀ required to generate arc, between the welding output and engine output,
As shown by the hatched portion shown by the external characteristic curve of the main winding and the engine output characteristic curve in FIG. 9, the engine output is lower than the welding output, the rotation speed drops extremely, and the welding output cannot be recovered. Also, because the space is limited, the reactor cannot be large. Note that the operating characteristic curve, point X, represents a required welding output.

[0004] In order to solve these problems, as a means for solving the above problems, as shown in the external characteristic curve of the main winding, the engine output characteristic curve and the external characteristic curve of the auxiliary winding in FIG. The circuit configuration of FIGS. 7 and 8 for superimposing a voltage from the auxiliary winding such that the small but no-load voltage becomes large to secure the no-load voltage V ₀ and set the main winding output so as not to exceed the engine output. Has been proposed.

That is, in the electric circuit configuration of the conventional engine welding machine shown in FIG. 7, a stator 3 on which a three-phase main welding winding 1 and a three-phase auxiliary welding winding 2 are wound, and these main welding windings are provided. Line 1
Salient pole type field rotator 4 for generating a three-phase AC voltage between the auxiliary welding winding 2 and the main welding winding 1 and the auxiliary welding winding 2
And rectifiers 5 and 6, which rectify the three-phase AC voltages generated respectively, a reactor 7, and a resistance 8 for drooping characteristics.

In the electric circuit configuration of the conventional engine welding machine shown in FIG. 8, a stator 3 on which a three-phase main welding winding 1 and a single-phase auxiliary welding winding 9 are wound, and these main welding windings are provided. A salient pole type field rotor 4 for generating a three-phase AC voltage and a single-phase AC voltage on the wire 1 and the auxiliary welding winding 9, and a three-phase AC rotator 4 on the main welding winding 1 and the auxiliary welding winding 2, respectively. Rectifiers 5 and 10 for rectifying a phase AC voltage and a single-phase AC voltage, a reactor 7, and a drooping characteristic reactor 11 are provided.

[0007]

However, it is difficult to increase the size of a reactor effective for preventing arc cut because of a portable engine welding machine, and it is necessary to satisfy domestic and foreign standards such as JIS and IEC. For example, the average value of the no-load voltage is MAX85V according to JIS, etc., and especially in the case of a coated welding rod such as a high cellulose rod frequently used in foreign countries such as the United Kingdom and the United States, the peak value is defined by the IEC standard.
There are restrictions such as X113V, and the following problems occur in FIGS. 7 and 8 due to the restrictions due to these standards.

When the auxiliary welding winding 2 shown in FIG. 7 has a three-phase rectification type, the peak value is low even when approaching the average value of the no-load voltage of 85 V, and the no-load voltage required for a high cellulose rod or the like. V ₀ runs short.

When the auxiliary welding winding 9 shown in FIG. 8 is of a single-phase rectification type, the peak value can be higher than that of the three-phase rectification type with respect to the average value of the no-load voltage. Since the frequency of the main welding winding 1 and that of the auxiliary welding winding 9 are the same, the peak value cannot be increased to a value close to MAX113V even if the average value of the no-load voltage is adjusted to the upper limit.

In the type in which the DC output of the auxiliary welding windings 2 and 9 is three-phase half-wave or single-phase half-wave rectified in FIGS. 7 and 8, the intervals between the waveforms are too wide, and the output also drops.
Arc cut characteristics are lost.

That is, an attempt is made to compensate for the fact that the reactor 7 cannot be increased by increasing the no-load voltage, but the average value is limited to the standard, and the voltage cannot be increased to a value at which the peak value can be used effectively.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a configuration in which the peak voltage can be set high while maintaining the average voltage of the no-load voltage within the standard so as to satisfy domestic and overseas standards. It is another object of the present invention to provide an engine welding machine capable of obtaining good arc characteristics even when a reactor is small.

[0013]

In order to solve the above-mentioned object, an engine welding machine according to the present invention comprises a stator having a main welding winding and an auxiliary welding winding wound thereon and a salient pole type field rotor. And a rectifier for rectifying the voltages generated in the main welding winding and the auxiliary welding winding, respectively, and a reactor in which a rectified voltage of the auxiliary welding winding is superimposed on a rectification voltage of the auxiliary welding winding. In the engine welding machine having the configuration described above, the salient pole type field rotor is provided in a cross shape, and each is excited by the field winding to become N pole, N pole, S pole, and S pole. It has four magnetic poles, and has no field winding wound between the N-pole and the N-pole, and between the S-pole and the S-pole. Poles are provided, and the auxiliary poles are used when the output from the main welding winding is not loaded. The field windings wound around the magnetic poles have polarities different from the polarities of the adjacent magnetic poles, and are paired with the four magnetic poles to form N poles, S poles, N poles, S poles, N poles, S
When the welding current flows through the main welding winding, the auxiliary pole is inverted by the armature reaction from the main welding winding, and the auxiliary pole is inverted to form a pair with the four magnetic poles. , N
Pole, N-pole, S-pole, S-pole, S-pole, and has a structure of a pseudo-six-pole two-pole rotor, and the main welding winding is an output by the pseudo six-pole of the salient pole type field rotor. In order to generate a voltage at a frequency, the three-phase winding has a winding structure in which all windings are dispersed in all slots, and the auxiliary welding winding is single-phase at an output frequency by the two poles of the salient pole type rotor when loaded. It has a winding structure that generates a voltage and includes a full-wave rectifier that performs full-wave rectification of the single-phase voltage of the auxiliary welding winding, and lowers the output frequency of the auxiliary welding winding below the output frequency of the main welding winding. The output of the welding winding is single-phase full-wave rectified and superimposed on the rectified voltage of the main welding winding, so that the average voltage when the output is not loaded within the specified voltage is set to a high voltage to ensure a high peak voltage. It is characterized by having.

Since the salient pole type field rotor has a structure of a pseudo 6 pole / 2 pole rotor, when no output is applied, the single-phase output of the auxiliary welding winding is a voltage having the same frequency as the output voltage of the main welding winding. When the load is applied, the single-phase output of the auxiliary welding winding becomes 1/3 of the output voltage frequency of the main welding winding, and the single-phase output of the auxiliary welding winding has a waveform including the third harmonic at the time of load. Therefore, it is possible to secure a high peak voltage while keeping the average voltage at the time of no output load at a high voltage within the standard voltage.

[0015]

FIG. 1 shows an embodiment of an engine welding machine according to the present invention.

In FIG. 1, the same components as those in FIGS. 7 and 8 described above are denoted by the same reference numerals, and 12 indicates a salient pole type field rotator. The three-phase winding of the main welding winding 1 and the single-phase winding of the auxiliary welding winding 9 are formed by the salient-pole type field rotor 12 described below by the auxiliary welding winding 9 when no output is applied.
Generates a voltage having the same frequency as the output voltage of the main welding winding 1, and the single-phase output of the auxiliary welding winding 9 becomes 1/3 of the output voltage frequency of the main welding winding 1 under load. The main welding winding 1 and the auxiliary welding winding 9 are wound around the slot position of the stator 3.

FIGS. 2 and 3 are illustrations of the polarity of the salient pole type field rotator and the magnetic poles used in the present invention.

2 and 3, the salient pole type field rotator 1
2 is provided with grooves 13 to 18, and a shaft 19 is attached to the center of the rotor 12. Grooves 15 and 1
Complementary poles 20 and 21 are formed by 6 and grooves 17 and 18. A field winding is wound between the grooves 15 and 13,
An N pole is generated in the magnetic pole 22 by a field current flowing in the direction shown in FIG. Similarly, the magnetic pole 23 becomes an S pole by the field winding wound between the grooves 13 and 1, and the grooves 18 and 14
The magnetic field pole wound between the grooves 14 and 16 turns the magnetic pole 24 into an S pole, and the magnetic field pole wound between the grooves 14 and 16 turns the magnetic pole 25 into an N pole.

Although no field winding is wound on any of the auxiliary poles 20, 21, it is magnetized as follows depending on the load state of the generator. That is, FIG. 2 shows the polarity when the welding output is unloaded, the N-pole 22, the gap between the stator (not shown) and the magnetic pole 22, the stator, and the gap between the stator and the auxiliary pole 20. And a magnetic circuit composed of the auxiliary pole 20, an N-pole magnetic pole 25, a gap between the stator (not shown) and the magnetic pole 25, a stator, a gap between the stator and the auxiliary pole 20, and an auxiliary pole 20. The auxiliary pole 20 is magnetized to the S pole by the magnetic circuit composed of For the same reason, the complementary pole 21 paired with the complementary pole 20 is magnetized to the N pole. Therefore,
The salient pole type field rotor 12 shown in FIG. 2 is a six pole rotor having alternate poles alternately.

On the other hand, FIG. 3 shows the polarity of the welding output when a load is applied, and an armature reaction occurs when a welding current flows through the generator. Due to the magnetomotive force based on the armature reaction, the auxiliary pole 20 is magnetized to the N pole and the auxiliary pole 21 is magnetized to the S pole for the reasons described later with reference to FIG. That is, when a large welding current flows through the armature, the polarities of the auxiliary poles 20 and 21 are reversed by the magnetomotive force due to the armature reaction. Thereby, the salient pole type field rotator 12 shown in FIG.
Is a substantially dipole salient-pole rotator having three consecutive north poles and three consecutive south poles, ie, two recesses between three consecutive north poles and three consecutive south poles. Since the poles at the two recesses correspond to the recesses, the poles are neglected because they correspond to the recesses, so that the rotor becomes substantially a two-pole salient pole type rotor and apparently a two pole rotor. Accordingly, the single-phase AC output winding, that is, the auxiliary welding winding 9 in FIG. 1 is in a form excited by the two-pole rotor,
This single-phase AC voltage is rectified by the rectifier 10 for full-wave rectification,
It is superimposed on the full-wave rectified output of the main welding winding 1 (see FIG. 1).

On the other hand, the salient pole type field rotor 1 having a six-pole structure on the side of the main welding winding 1 provided to be of the three-phase full-wave rectification type has the above-described armature reaction. For two
Due to the configuration of the poles, a voltage having one cycle of one rotation of the rotor 1 is induced in each winding of three phases.

FIG. 4 is an explanatory view of the magnetic flux distribution due to the magnetomotive force of the armature reaction of the main welding winding. The magnetomotive force due to the armature reaction and the respective poles of the rotor when the U-phase current is at a peak and the welding output is near a short circuit. And the position of are drawn. When the magnetic pole of the salient pole type field rotor 12 is at the position shown in FIG. 4, the magnetomotive force due to the armature reaction reaches a peak. As is clear from FIG. 4, the auxiliary poles 20, 21 shown in FIGS. 2, 3 are located near the grooves # 34, # 16 provided in the stator.

When in that position, the U-phase current at the peak receives a maximum armature reaction. Therefore, the auxiliary pole 20
The S pole is magnetized in the opposite direction by the reaction magnetomotive force. Note that the position of the magnetic pole is different from the state shown in FIG.
For example, under the condition that the auxiliary pole 9 is located near the groove # 27, the auxiliary pole 20 appears to be affected by the S-pole when viewed from FIG. 4, but is located near the groove # 27. In the state, the U-phase current is small, there is almost no effect of the armature reaction, and the effect of the S pole is rarely received.

Similarly, the N pole of the auxiliary pole 21 is also magnetized in the opposite direction by the reaction magnetomotive force under the state shown in FIG. That is, as described above, the magnetic poles 25, 2
Both 0 and 22 are converted to N poles, and the magnetic poles 23, 21 and 24 are converted to S poles.

In this description, the case where the U-phase current is at a peak has been described. However, the same applies to other V-phase and W-phase currents.
The polarities of the auxiliary poles 20 and 21 are reversed, and the salient pole type field rotator 12 becomes an apparent N, S dipole rotator.

FIG. 5 is an enlarged waveform explanatory view of an embodiment of the engine welding machine according to the present invention. FIG. 5 (A) shows auxiliary welding in which the salient pole type field rotor has two poles when no output is applied. (B) shows the output waveforms of the main welding winding [1] and the auxiliary welding winding [2] of the pseudo-pole type field rotor having a pseudo 6-pole when the output is not loaded. .

Here, when the rotational speed of the salient pole type field rotator 12 is 3600 rpm, the pseudo pole type field rotator 12
The main welding winding 1 is wound around the stator 3 such that an output voltage of 180 Hz is generated by the poles and the auxiliary welding winding 9 is generated by the two poles of the salient pole type field rotor 12. An example in which the output of the winding 9 is output at １ ／ of the frequency of the main welding winding 1 is shown as an example.

When the output of the engine welding machine according to the present invention is not loaded, the main welding winding 1 has a waveform as shown in [1] of FIG. 5B and the auxiliary welding winding 9 has a waveform as shown in FIG. The output waveforms at the time of no-load output in which the full-wave rectified output of the auxiliary welding winding 9 is superimposed on the full-wave rectified output of the main welding winding 1 of FIG. 1 are shown in FIG. Such a waveform can be represented by a simulated waveform (shown by a bold line).

That is, as is apparent from the enlarged waveform of FIG. 5, the center of the two-pole 60 Hz single-phase rectified output of the auxiliary welding winding 9 strongly includes the effect of the third harmonic, and the peak portion has a concave shape. Therefore, the voltage waveform at the time of no load in FIG. 6A does not largely include the pseudo 6-pole 180 Hz harmonic of the auxiliary welding winding 9 as is apparent from the enlarged waveform in FIG. 5A. FIG. 6 including a single-phase rectified output that can be said to be a substantially sine wave
The waveform shape is different from the voltage waveform when the output is not loaded in (B).

The two poles 6 of the auxiliary welding winding 9 described above
The center of the single-phase rectified output at 0 Hz strongly contains the third harmonic and is shadowed.
The shape wave of Fig. 6 (A), which is strongly affected and whose mountain is concave
Peak voltage V_p26 poles 180 of the auxiliary welding winding 9 and
Single-phase almost sine wave that does not contain harmonics
The peak voltage V of the shape waveform of FIG. 6B including the rectified output _p6
When the values are the same, the average value of both is clearly
The superposed waveform of FIG. 6B having six poles is larger. Conversely, this
If the average values are the same, FIG.
(A) peak voltage V_p2Can be increased.

In the engine welding machine of the present invention, based on the principle described above, for example, the salient pole type field rotor 1
2 is 3600 rpm, the main welding winding 1 is 18
Auxiliary welding winding 9 fixes each winding such that an output voltage of 0 Hz (due to the pseudo-pole of the salient pole type field rotor 12) and an output voltage of 60 Hz (due to the two poles of the salient pole type field rotor 12) are generated. The auxiliary welding coil 9 is wound around the armature 3 and the output of the auxiliary welding coil 9 is set to 1/3 of the frequency of the main welding coil 1 for output. However, the configuration is not necessarily limited to this example.

With such a configuration of the engine welding machine having the stator 3 on which the salient-pole type field rotor 12 and the main welding winding 1 and the auxiliary welding winding 9 are wound, the output power at the time of no load is obtained. A high peak voltage can be secured while keeping the average voltage within the standard voltage, and good arc characteristics can be obtained even when the reactor 7 is small.

[0033]

As described above, according to the present invention, a pseudo 6-pole / 2-pole salient pole type field rotor is used, and the auxiliary welding winding is used for the frequency of the voltage generated in the main welding winding. In addition to lowering the frequency of the voltage generated at the same time, the single-phase voltage of the auxiliary welding winding is full-wave rectified and superimposed on the DC voltage on the main welding winding side, so the average voltage when the output is not loaded is specified. The peak voltage can be set high while keeping the high voltage within the specified standard value, and good arc characteristics can be obtained even if the reactor is small.

[Brief description of the drawings]

FIG. 1 is a configuration of an embodiment of an engine welding machine according to the present invention.

FIG. 2 is a diagram illustrating the polarity of a salient pole type field rotator and magnetic poles used in the present invention.

FIG. 3 is a diagram illustrating the polarity of a salient pole type field rotator and magnetic poles used in the present invention.

FIG. 4 is an explanatory diagram of a magnetic flux distribution due to a magnetomotive force of an armature reaction of a main welding winding.

FIG. 5 is an enlarged waveform explanatory diagram of an embodiment of the engine welding machine according to the present invention.

FIG. 6 is an explanatory diagram of waveform comparison of one embodiment when no output is loaded.

FIG. 7 is an electric circuit configuration of a conventional engine welding machine.

FIG. 8 is an electric circuit configuration of a conventional engine welding machine.

FIG. 9 is a characteristic curve diagram of a conventional engine output and an output when there is one welding winding.

FIG. 10 is a characteristic curve diagram of engine output and welding output when two windings are used as welding windings.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main welding winding 2, 9 Auxiliary welding winding 3 Stator 4, 12 Salient pole type field rotor 5, 6, 10 Rectifier 7 Reactor

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 21/20 H02K 11/00 Y 5H621 // H02K 7/18 X F term (reference) 4E082 BA01 CA04 5H603 AA01 BB02 BB07 BB09 BB12 CA01 CA02 CA04 CA05 5H607 BB02 BB07 BB14 CC01 FF22 5H611 BB02 BB06 PP05 QQ05 5H619 AA01 BB02 BB05 BB06 BB15 PP01 PP02 PP04 PP08 PP12 PP14 5H621 GA04 GB10 HH01

Claims (1)

[Claims] A generator provided with a stator on which a main welding winding and an auxiliary welding winding are wound and a salient pole type field rotor, and a voltage generated in the main welding winding and the auxiliary welding winding. An engine welding machine having a rectifier for rectifying a current and a reactor for applying a DC voltage obtained by superimposing a rectified voltage of an auxiliary welding winding on a rectified voltage of a main welding winding. , Cross-shaped, each of which is excited by a field winding to form N pole, N pole, S pole, S pole.
The field winding has four magnetic poles, and a field winding is wound between the N-pole and the N-pole, and between the S-pole and the S-pole. An auxiliary pole that is not turned is provided, and the auxiliary pole has a polarity different from the polarity of the adjacent magnetic poles due to the field winding wound on the adjacent magnetic poles when the output from the main welding winding is not loaded. In combination with the above four magnetic poles, N pole, S pole, N pole, S pole, N pole,
When the welding current flows through the main welding winding, the auxiliary pole is inverted by the armature reaction from the main welding winding, and the auxiliary pole is inverted to form a pair with the four magnetic poles. very,
It has a structure of a pseudo-six-pole-two-pole rotator having N poles, N poles, S poles, S poles, and S poles, and the main welding winding is formed by the pseudo six poles of the salient pole type field rotor. In order to generate a voltage at the output frequency, the three-phase winding has a winding structure in which all windings are dispersed in all slots, and the auxiliary welding winding has a single winding at the output frequency of the two poles of the salient pole type rotor when loaded. It has a winding structure that generates a phase voltage, has a full-wave rectifier that performs full-wave rectification of the single-phase voltage of the auxiliary welding winding, and lowers the output frequency of the auxiliary welding winding below the output frequency of the main welding winding. The output of the auxiliary welding winding is single-phase full-wave rectified and superimposed on the rectified voltage of the main welding winding, and is set to a high voltage while maintaining the average voltage at no output load within the specified voltage to ensure a high peak voltage. An engine welding machine characterized in that: