JPH0691723B2 - Self-excited generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a self-excited generator, and more particularly to an automatic voltage regulator (AV
R) Concentrated winding type self-excited generator.

2. Description of the Related Art Conventionally, as shown in FIG. 4, the output winding 3 and the excitation winding 4 are concentratedly wound on the same side of the stator core 2 portion deviated from the rotor 1 so as to be in phase. Although such a self-excited generator is well known, the fluctuation of the output voltage due to the increase / decrease of the load current is relatively large in such a structure. Especially when such a self-excited generator is driven by an engine, the output voltage fluctuates greatly due to the synergistic effect that the engine speed fluctuates due to load fluctuations.

Therefore, in such a self-excited generator, as shown in FIG. 5, the output voltage is controlled by feedback controlling the exciting current supplied to the field winding 5 of the generator by the AVR 6 according to the output voltage Vo of the generator. In order to stabilize Vo, a large amount of current control is required in AVR6 in order to compensate for large voltage fluctuations.
At that time, as shown in FIG.
It has the characteristic that Vo drops sharply.

Further, conventionally, as shown in FIG. 7, in order not to be affected by demagnetization due to the cancellation of the main magnetic flux by the magnetic flux generated in the stator core by the load current, the rotor core 2 part is provided with the rotor 1 A second magnetic path is provided in parallel on the side opposite to the side on which the output winding 3 is wound, and the excitation winding is provided on the second magnetic path portion with a phase difference of 180 ° with the output winding 3. Line 4
Has been developed so that the induced voltage due to the generated magnetic flux corresponding to the load current flowing in the output winding can be extracted in a concentrated manner (see Japanese Utility Model Laid-Open No. 59-155871).

However, in the case of such a type, contrary to the above, when there is no load, almost no magnetic flux passes through the excitation winding 4 part having a small iron core cross-sectional area, and as shown in FIG. When stabilization is attempted, the power supply voltage of the AVR 6 may drop when there is no load, which may interfere with the supply of the field current to the rotor 1.

The present invention has been made in consideration of the above points, and it is possible to always secure the power supply voltage of the AVR regardless of whether there is no load or overload. (EN) A concentrated winding type self-excited generator capable of exerting a voltage adjusting function.

In order to achieve the object of the present invention, two magnetic poles facing each other, a first magnetic path continuously connected in parallel between the two magnetic poles, and a second magnetic path having a larger magnetic resistance than that are integrally formed. Of the stator, a rotor rotatably disposed between the facing magnetic poles of the stator, a field winding wound around the rotor to generate a magnetic flux, and a rotor of the stator. An output winding wound around the first magnetic path in a concentrated winding to generate electric power to be supplied to a load, and a concentrated winding wound in phase with the output winding in the first magnetic path of the stator. A first excitation winding forming a power supply for an automatic voltage regulator that supplies an output control current to the field winding according to an output voltage of the output winding; and the second magnetic field of the stator. A concentrated winding independent of the first excitation winding is provided in the path, and an excitation current is supplied to the field winding. And a second excitation winding for controlling the output control current of the automatic voltage regulator and a rectified output current of the excitation current generated by the second excitation winding are supplied to the field winding. .

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the self-excited generator according to the present invention, as shown in FIG. 1, the output winding 3 and the first excitation winding 4 are in phase with each other in the first magnetic path 7 portion of the stator core 2. In this way, the second excitation winding 9 is wound in the concentrated winding as described above, and the second excitation winding 9 is provided in the second magnetic path 8 portion provided in parallel so as to face the first magnetic path 7 with the rotor 1 interposed therebetween. Winding intensively, output voltage Vo
The output of AVR6 that automatically adjusts the voltage so that
The output of the second excitation winding is full-wave rectified by the rectifier REF, and the current smoothed by the capacitor C is applied to the field winding 5 via the brush B. The second excitation winding 9 is set to be insufficient to keep the output voltage Vo at the rated value.

AVR6 is a publicly known automatic voltage regulator itself. It reads the output voltage of the output winding 3 as a detection voltage, and
Using the output voltage of the first excitation winding 4 as a power source, the output winding 3
Is provided so that the shortage of the exciting current supplied to the field winding 5 can be compensated so that the output voltage Vo of the above is substantially constant.

In FIG. 1, the second excitation winding 9 is referred to as the output winding 3.
The figure shows the case where they are wound intensively with a phase difference of 180 °.

Thus, in the configuration as described above, the main excitation is performed according to the voltage induced in the second excitation winding 9 in proportion to the increase or decrease of the load, and the shortage of the main excitation causes the shortage of the first excitation. The output voltage of the output winding 3 using the output voltage of the excitation winding 4 as a power source
It will be compensated by the output of AVR6 when it is controlled so that Vo becomes substantially constant. The main magnetic flux Φo is a magnetic flux generated by passing a field current through the field winding 5,
When no load is applied, the cross-sectional area of the second magnetic path 8 around which the second excitation winding 9 is wound is equal to the first magnetic field around which the output winding 3 and the first excitation winding 4 are wound. Since it is smaller than that of the path 7 and has a large magnetic resistance, it passes through the first magnetic path 7 portion and hardly passes through the second magnetic path 8 portion.

At the time of load, as shown in FIG.
, The magnetic flux Φr is generated in the stator core 2 in the direction of canceling the main magnetic flux Φo passing through the first magnetic path 7 by the load current at that time, and the main magnetic flux Φo acting on the output winding 3 is generated. Try to reduce.

Therefore, it is necessary to increase the amount of current supplied to the field winding 5 as the load current increases and the magnetic flux Φr generated in the stator core 2 increases.

Therefore, according to the present invention, when the magnetic flux Φr is generated according to the load current, the main magnetic flux Φo passing through the first magnetic path 7 is reduced, and the amount ΔΦo corresponding to the decrease of the main magnetic flux Φo is reduced to the second magnetic flux. Since it is made to flow into the path 8, the magnetic flux Φr and ΔΦo corresponding to this decrease will eventually flow through the second magnetic path 8. Therefore, a voltage is induced in the second excitation winding 9, and a current corresponding to the output of the second excitation winding 9 is supplied to the field winding 5. That is, as the load current increases, a larger current is supplied from the second excitation winding 9 to the field winding 5.

At the same time, a shortage of field current for keeping the output voltage at Vo is supplied from AVR6. At that time, of the current required to maintain the output voltage Vo substantially constant by the AVR6, the second
The current is controlled such that the current supplied from the exciting winding 9 is insufficient.

That is, the AVR 6 uses the output of the first excitation winding 4 as a power source and performs automatic voltage adjustment to compensate for the shortage of the field current supplied from the second excitation winding 9, thereby generating the output voltage Vo. AVR with a small capacity
However, it becomes possible to effectively exert the automatic voltage adjustment of the output voltage Vo that varies greatly depending on the load.

Therefore, even if the load suddenly increases, the excitation of the field winding 5 corresponding to the increase is compensated by the output of the second excitation winding 9, and the AVR 6 is overloaded. This will not happen.

When no load is applied, as shown in FIG. 3, when an initial voltage Vo ′ (Vo ′ <Vo) is generated by initial excitation from the outside or self-excitation utilizing the residual magnetism of the rotor 1, at that time, While the output induced in the first excitation winding 4 by the main magnetic flux Φo ′ passing through the magnetic path 7 is used as a power source and controlled by the AVR 6, the output current of the AVR 6 is supplied to the field winding 5. At that time, as described above, the main magnetic flux Φ flows in the second magnetic path 8.
The second excitation winding 9 does not serve as an excitation source, but in this case, the first excitation winding 4 does not pass.
Output voltage Vo ′ to a specified output voltage
The power supply voltage of AVR6 will be secured enough to increase to Vo.

Effect As described above, the self-excited generator according to the present invention is of the concentrated winding type, and is excited in a magnetic path different from that in which the output winding is wound according to the load current. The output that is induced in the winding is added to the field winding as it is, and the insufficient excitation is output as an AVR output according to the output that is induced in the excitation winding that is wound in the same magnetic path as the output winding. By replenishing by adding to the field winding, it is possible to always secure the AVR power supply voltage regardless of whether there is no load or overload, and to follow large load fluctuations with a small capacity AVR. It has an excellent advantage that the automatic voltage adjustment described above can be effectively performed.

[Brief description of drawings]

FIG. 1 is an electrical connection diagram showing an embodiment of a self-excited generator according to the present invention, FIG. 2 is a diagram showing a magnetic flux generation state under load in the embodiment, and FIG. 3 is a no-load in the embodiment. Fig. 4 is a diagram showing a state of magnetic flux generation at the time, Fig. 4 is a diagram showing a structure of a conventional concentrated winding type self-exciting generator, Fig. 5 is a circuit configuration diagram of the electric system, and Fig. 6 is an output at the time of load. FIG. 7 is a diagram showing a voltage characteristic, FIG. 7 is a diagram showing the structure of another conventional concentrated winding type self-exciting generator, and FIG. 8 is a circuit configuration diagram of its electric system. 1 ... Rotor, 2 ... Stator core, 3 ... Output winding, 4
...... First excitation winding, 5 ... Field winding, 6 ... AVR, 7
...... First magnetic path, 8 ...... Second magnetic path, 9 ...... Second excitation winding, 10 ...... Load

Claims (1)

[Claims] 1. A fixed structure in which two opposing magnetic poles, a first magnetic path continuous in parallel between the two magnetic poles, and a second magnetic path having a magnetic resistance larger than that of the first magnetic path are integrally formed. A rotor, a rotor rotatably arranged between the facing magnetic poles of the stator, a field winding wound around the rotor to generate magnetic flux, and the first magnetic field of the stator. An output winding wound in a concentrated winding on the path to generate electric power to be supplied to the load; and a concentrated winding wound in the same phase as the output winding on the first magnetic path of the stator, A first excitation winding forming a power supply of an automatic voltage regulator that supplies an output control current to the winding according to an output voltage of the output winding, and the first excitation winding in the second magnetic path of the stator. Second excitation winding, which is wound in a concentrated winding independently of the excitation winding of (1) and supplies an excitation current to the field winding. And a self-excited generator configured to supply an output control current of the automatic voltage regulator and a rectified output current of an exciting current by the second exciting winding to the field winding. .