JPH0540698Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an AC output combined welding power generator that allows welding output and AC output to be extracted from one generator.

[Conventional technology]

There are engine-driven generators that can be used for welding output and AC output simultaneously. Although the output of the engine is sufficient for the welding output, it may not be able to cover the total of the welding output and the AC output, and countermeasures have been taken into account.

Regarding this type of AC output combined welding generator, the applicant has also made several proposals in the past (for example, Utility Model Application No. 183549/1983). The circuit configuration diagram is shown in FIG. In Fig. 2, 20 to 25 are welding windings, 26 is a rectifier diode, and 27 is a welding winding.
is a reactor, 28 is a welding output terminal, 29 is a single-phase AC output winding, 30 is a breaker, 31 is a single-phase AC output terminal, 32 is a self-excited output winding, 33 is a rectifier diode, 34 is a semi-fixed resistor, 35 is a variable resistance, 36
is a field winding, and 37 is a slip ring.

The self-excited output winding 32 is a self-excited output winding that is wound (two-pole winding) so as to produce a two-pole component output. The voltage of the self-excited output winding 32 is rectified by a rectifier diode 33, a semi-fixed resistor 34, a variable resistor 35
After being controlled by , it is supplied to the field winding 36 via the slip ring 37 . The variable resistor 35 is for adjusting the welding current, and the semi-fixed resistor 34 is for determining the maximum welding output. The magnetic flux generated by the field winding 36 causes the welding windings 20 to 2 to
5 (6-pole winding) and single-phase AC output winding 29 (2
A voltage is induced in the pole winding). Welding winding 20~
The voltage induced in the welding output terminal 25 is rectified by the rectifier diode 26 and passed through the reactor 27.
8 as the welding output. Further, the voltage induced in the single-phase AC output winding 29 is taken out as an AC output from the single-phase AC output terminal 31 via the breaker 30.

An example of a winding diagram of the stator of the AC output combined welding generator is shown in FIG. The welding winding is wound around six poles, and the single-phase AC output winding is wound around two poles. The self-excited output winding 32 is also wound into two poles as described above. The number inserted in the middle of each winding represents the number of conductors inserted into the corresponding slot. The reason why the number of conductors inserted in the single-phase AC output winding 29 is varied from 6 to 8 and 12 depending on the slot is to improve the waveform of the single-phase AC output.

The rotor of the above AC output combined welding generator is
It is shown in Fig. 4. The difference between Figure 3 and Figure 4 is
This is due to the difference in polarity between the commutating poles 9 and 10. The polarity in FIG. 3 is the polarity when the welding output is under no load, and the polarity in FIG. 4 is the polarity when the welding output is under load.

3 and 4, the rotor 1 is provided with grooves 2 to 7, and a shaft 8 is attached to the center of the rotor 1. As shown in FIGS. Grooves 4 and 5 and Grooves 6 and 7
The commutating poles 9 and 10 are formed by. Groove 4
A field winding 36 is wound between and 2, and a north pole is generated in the magnetic pole 11 by the field current flowing in the direction shown in the figure. Similarly, the field winding 36 wound between grooves 2 and 6 turns the magnetic pole 12 into an S pole, and the field winding 36 wound between grooves 7 and 3 turns the magnetic pole 13 into an S pole. The magnetic pole 14 becomes an S pole, and the field winding 36 wound between the grooves 3 and 5 causes the magnetic pole 14 to become an N pole.

Although no field winding is wound around the commutating poles 9 and 10, the polarity thereof changes as follows depending on the load condition of the generator.

When the welding output is under no load, the polarity is as shown in Figure 3. At this time, the magnetic circuit follows the path of N magnetic pole 11 → gap between magnetic pole 11 and stator (not shown) → stator → gap between stator and commutator 9 → commutator 9 → N pole magnetic pole 11 Accordingly, the magnetic pole 14 of the N pole → the magnetic pole 14
Due to the magnetic circuit of the path of the gap between the stator and the stator → the stator → the gap between the stator and the commutator 9 → the commutator 9 → the N pole magnetic pole 14, the commutator 9 becomes the S pole as shown in Figure 3. magnetized. Similarly, the commutator 1 paired with the commutator 9
0 is magnetized to the north pole. Therefore, the rotor 1 shown in FIG. 3 is a six-pole rotor having alternately different poles.

When the welding output is a load, the polarity of the rotor is as shown in FIG. At this time, an armature reaction occurs due to the welding current flowing to the generator. The state of the armature reaction is shown in FIG. 5, and due to the magnetomotive force based on the armature reaction, the commutative pole 9 becomes substantially the north pole, and the commutative pole 10 becomes the south pole. That is, when a large welding current flows through the armature, the polarity of the commutating poles 9 and 10 is reversed by the magnetomotive force caused by the armature reaction. As a result, the rotor 1 in FIG. 4 becomes a convex-pole rotor with three consecutive north poles and three consecutive south poles, and appears to be a two-pole rotor. Therefore 2
The pole-wound single-phase AC output winding 29 is well-induced by the two-pole rotor, and generally reduces the drop in single-phase AC voltage caused by the flow of welding current during welding output load. It can be supplemented.
This is because the two-pole component in the field magnetic flux is apparently increased.

FIG. 5 is an explanatory diagram of the magnetic flux distribution due to the magnetomotive force of the armature reaction of the welding winding, and the drawn lines of magnetic force represent those when the current in each phase reaches its peak. When the rotor 1 is in the position shown in FIG. 5 at the time of the U-phase current peak,
The armature reaction toward 0 is the largest, as is clear from the situation of the magnetic field lines shown. At this time, the commutative poles 9 and 10 are located near the slots #34 and #16 provided in the stator, and the commutative pole 9, which was the S pole when welding was not loaded, is turned to the N pole by the reaction magnetomotive force. The commutating pole 10, which was a north pole during no-load welding, is magnetized to an south pole. That is, during welding output load, the magnetic poles 14, 9, and 11 are all N poles,
The magnetic poles 12, 10, and 13 are all S poles, and the rotor 1 appears to be a two-pole rotor.

The above explanation is for when the U-phase current is at its peak, but the same applies when the V-phase and W-phase currents are at their peak.
The polarity of the rotor 1 is reversed, and the rotor 1 apparently operates as a two-pole rotor of N and S.

[Problem that the invention attempts to solve]

However, in the above-mentioned AC output combined welding generator, the self-excited output winding was only a two-pole winding. Therefore, the voltage induced in the two-pole self-excited output winding behaved in the same manner as the voltage induced in the two-pole single-phase AC output winding 29 described above. In other words, during no-load welding, there is no armature reaction due to the welding current, so the rotor primarily behaves as six poles, and the two-pole component is reduced by that amount. There was a problem with low voltage.

And the rotor is 2 at the time of welding output load.
Since the configuration is such that the polar component increases, the voltage fluctuation rate of the self-excited output winding is not necessarily sufficient compared to when a complete two-pole rotor is used instead of this configuration, and single-phase There was a problem that the voltage fluctuation rate of AC output decreased.

If the self-excited output winding is only a 6-pole winding,
Although improvements were made in terms of an improvement in the voltage fluctuation rate and an increase in welding no-load voltage, other new problems that did not exist when using two-pole winding occurred. For example, the rising curve of engine output and the rising curve of self-excited output may not match well, resulting in an overflow.
Problems include the possibility of a load condition or the increase in the number of windings required to form the self-excited output winding.

The present invention has been made in view of the above problems.

[Means for solving problems]

In order to solve the above-mentioned problems, in this invention, in order to suppress the disadvantages of using only 2-pole self-excited output windings and only 6-pole self-excited output windings, we have developed a 2-pole self-excited output winding. In addition to the 6-pole self-exciting output winding, an appropriate number of 6-pole self-exciting output windings were provided, and their rectified outputs were combined in parallel and supplied to the field winding, with the following configuration.

That is, a stator is wound with a six-pole welding winding, a two-pole single-phase AC output winding, and a two-pole self-excited output winding, and a rectified output of the self-excited output winding. In an engine-driven AC output combined welding generator having a convex-pole field rotor wound with a field winding energized by A wire is provided in the stator, and the field winding is energized by an output obtained by parallel synthesis of the rectified output of the second self-excited output winding and the rectified output of the self-excited output winding.

〔Example〕

FIG. 1 shows a circuit configuration diagram of an AC output combined welding generator according to an embodiment of the present invention. FIG. 6 shows a winding diagram of a stator in an embodiment of the present invention. In Figure 1, the same numbers as in Figure 2 are the same as those in Figure 2.
Refers to the same thing as shown in the figure. 32' is a self-excited output winding, and 33' is a rectifier diode.

The difference from the conventional one shown in FIG. 2 is that a self-excited output winding 32' and a rectifying diode 33' for rectifying the output of the self-excited output winding 32' are newly provided, and the rectified output is connected to the rectifying diode 33. This is the point that is combined in parallel with the rectified output of . Here, the self-excited output winding 32' is
As can be seen from the winding diagram in FIG. 6, it is wound so as to produce a six-pole component output (six-pole winding). When the output of the self-excited output winding 32 and the output of the self-excited output winding 32' are combined in parallel, the number of windings will be (The curves do not match and overload occurs, and if only 6 pole windings are used, the number of windings increases) are not so noticeable, but on the other hand, the voltage fluctuation rate is small. An appropriate amount is selected while taking into consideration the output size of the two-pole self-excited output winding 32 so that the advantages of increasing the welding no-load voltage become higher. Note that it is not necessarily necessary to apply the coating evenly over the entire circumference of the rotor.

The AC output combined welding generator configured as described above operates as follows. Self-excited output winding 32 (2
The outputs of the self-excited output winding 32' (six-pole winding) are rectified by rectifier diodes 33 and 33', respectively, and combined by parallel connection. Since the outputs of the self-excited output windings with two winding methods are combined,
The field winding 36 is excited by the combined output, for example, when excitation by the output of the two-pole self-exciting output winding 32 causes a problem, the output of the six-pole self-exciting output winding 32' is It is done in such a way that it works to compensate for. Voltage is induced in the welding windings 20 to 25 and the single-phase AC output winding 29 by the magnetic flux generated by the field winding 36, and welding output and AC output are respectively taken out.

[Effect of idea]

As described above, according to the present invention, the field winding 3
6 is energized by the parallel combination of the output from the two-pole self-excited output winding 32 and the output from the six-pole self-excited output winding 32' in an appropriate size.
The problems that were noticeable when only each output was used are resolved, the voltage fluctuation rate of the AC output is improved, and the welding no-load voltage becomes higher. In addition, since the six-pole self-excited output winding 32' may be wound in an appropriate amount while taking into account its effects, the number of windings will not increase unnecessarily.

[Brief explanation of drawings]

Fig. 1...Circuit configuration diagram of an AC output combined welding generator according to an embodiment of the present invention, Fig. 2...Circuit configuration diagram of a conventional AC output combined welding generator, Figures 3, 4.
Figure...Explanatory diagram of the magnetic poles of the rotor, Figure 5...Explanatory diagram of the magnetic flux distribution due to the magnetomotive force of the armature reaction of the welding winding,
FIG. 6: A winding diagram of a stator in an embodiment of the present invention. FIG. 7: A winding diagram of a stator in a conventional example. In the figure, 1 is a rotor, 2 to 7 are grooves,
9 and 10 are commutating poles, 11 to 14 are magnetic poles, 20 to 25 are welding windings, 26 is a rectifier diode,
27 is a reactor, 28 is a welding output terminal, 29 is a single-phase AC output winding, 30 is a breaker, 31 is a single-phase AC output terminal, 32, 32' are self-excited output windings, 33,
33' is a rectifier diode, 34 is a semi-fixed resistor, 3
5 is a variable resistor, 36 is a field winding, and 37 is a slip ring.

Claims (1)

[Scope of utility model registration request] A stator is wound with a 6-pole welding winding, a 2-pole single-phase AC output winding, and a 2-pole self-excited output winding, and the rectified output of the self-excited output winding In an engine-driven AC output combined welding generator equipped with a convex-pole field rotor around which a field winding is energized, the second self-excited output winding has a six-pole winding. The field winding is provided in the stator, and the field winding is energized by an output that is a parallel combination of the rectified output of the second self-excited output winding and the rectified output of the self-excited output winding. AC output combined welding generator.