JPH0441749Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention is applicable to generators, especially alternating current generators that use a stator core in which magnetic poles and yoke are integrally formed. This invention relates to a generator in which a sub-yoke is provided which is joined to the sub-yoke, and demagnetizing flux due to armature reaction is introduced into the sub-yoke to compensate for the output voltage drop of the generator.

(Background of the idea and problems) Conventionally, when compensating for the output voltage drop of a generator,
As shown in FIG. 7, a common control configuration is to control the field current flowing through the field winding 2 wound around the rotor 1 and increase or decrease the magnetic flux. For example, when the load increases, the armature reaction occurs, i.e. the magnetic poles 3, 3 and the yoke 4.
As the load current flowing through the power generation winding 6 wound around the stator 5 is integrally formed, the demagnetizing flux Φ' increases, and the main magnetic flux Φ contributing to power generation apparently decreases. The terminal voltage of the machine drops.
In order to compensate for the output voltage drop due to this armature reaction, the field current is increased to increase the main magnetic flux Φ, and control is performed to keep the terminal voltage of the generator constant.

In performing compensation control for the output voltage drop caused by this armature reaction, conventionally the voltage generated in the power generation winding 6 or the external power supply 7 is used to control the field current as described above to increase. Therefore, it has been desired to realize a control circuit that can more easily compensate for the output voltage drop due to armature reaction.

(Purpose and structure of the invention) The purpose of this invention is to solve the above points, and by actively utilizing the demagnetizing flux generated by the armature reaction, the output generated by the armature reaction can be achieved with a simple configuration. The purpose is to provide a generator whose voltage drop is compensated.

Now, as explained above, the main magnetic flux Φ generated by the field winding 2, the armature reaction magnetic flux generated by current flowing through the generator winding 6, that is, the demagnetizing flux Φ', and the terminal voltage ν of the generator. When the resistance of the power generation winding 6 is ignored, the following relationship holds true.

ν∝nd(Φ-Φ')/dt where n is the number of turns of the power generation winding 6. Since the demagnetizing flux Φ' is proportional to the load current, this demagnetizing flux Φ' is used to reduce the field current proportional to the load. By providing a control circuit that flows into the magnetic winding 2, the generator of the present invention maintains a constant voltage at its terminals. Therefore, the generator of the present invention includes a rotor around which a field winding is wound, a stator having magnetic poles provided opposite to the rotor, and in which the magnetic poles and the yoke are integrally formed. A generator having a power generation winding wound around a yoke, including a auxiliary yoke configured to be connected to the yoke of the stator to form a auxiliary magnetic path, and a yoke on the auxiliary yoke. A voltage compensation winding and an auxiliary power generation winding forming part of the power generation winding are provided, and the voltage generated in the voltage compensation winding is applied to the field winding of the rotor via a rectifier circuit. None, a part of the demagnetizing flux generated by the current flowing in the power generation winding wound around the yoke is guided to the auxiliary magnetic path of the auxiliary yoke, and the auxiliary power generation winding wound around the yoke is connected to the auxiliary yoke. A voltage is induced in the voltage compensation winding, and the power generation winding and the auxiliary power generation winding are connected in series to compensate for the output voltage drop of the generator due to armature reaction. It is characterized by This will be explained below with reference to FIGS. 1 to 6.

(Example of the invention) Fig. 1 shows the configuration of the generator considered as the premise of the invention, Fig. 2 shows the demagnetizing flux characteristic curve, Fig. 3 shows the magnetic flux characteristic curve generated from the field winding, and Fig. 4 shows the generator configuration considered as the premise of the invention. An output characteristic curve, FIG. 5 shows an embodiment of a generator according to the present invention, and FIG. 6 shows an example of a stator core punched out.

In FIG. 1, numerals 1 to 6 correspond to those in FIG. 7, which have already been explained. Reference numeral 8 is a sub-yoke which forms a sub-magnetic path using the yoke 4 of the stator 5, 9 is a voltage compensation winding which is wound around the sub-yoke 8, and 10 is a rectifier. 11 is a slip ring which rectifies the voltage generated in the voltage compensation winding 9, and 12 is a load.

In the case of no load, that is, when the load 12 is zero,
Since the current flowing through the power generation winding 6 is zero, the demagnetizing flux Φ' is also zero. The main magnetic flux Φ generated by the field winding 2 is divided at a magnetic branch point A between the yoke 4 and the sub-yoke 8 in proportion to the cross-sectional area of each magnetic path. The yoke 4 and the auxiliary yoke 8 meet again at a magnetic branch point B. Therefore, even when there is no load, a part of the main magnetic flux Φ flows through the sub-yoke 8 and the voltage compensation winding 9
A voltage is induced in The voltage induced in this voltage compensation winding 9 is rectified by a rectifier 10, and
It is supplied to the field winding 2 via the ring 11.

On the other hand, when the current I flows through the load 12, the load current I also flows through the armature, that is, the power generation winding 6, and the load current I generates a demagnetizing flux Φ' in the opposite direction to the main magnetic flux Φ. An armature reaction occurs in which the number of magnetic fluxes interlinking with the line 6 decreases. A part of this demagnetizing flux Φ' also flows into the newly installed sub-yoke 8.
Alternatively, the magnetic resistance of the yoke 4 substantially increases, and the amount of magnetic flux that is shunted to the auxiliary yoke 8 side of the main magnetic flux Φ increases. As the load current I increases, the magnetic flux Φ flowing through the sub-yoke 8 increases, the output voltage induced in the voltage compensation winding 9 increases, and a larger field current is caused by the field winding 2. supply This compensates for the generator output voltage drop due to armature reaction,
The terminal voltage of the generator winding 6 is kept substantially constant.

FIG. 2 shows a demagnetizing flux characteristic curve, in which as the load current I increases, the demagnetizing flux Φ' generated by the load current I increases. Along with this, the magnetic flux Φ flowing in the sub-yoke 8 increases as shown by the solid line in FIG. In Fig. 3, Φ″ represents the main magnetic flux that is shunted to the sub-yoke 8 during no-load. Due to the increase in the magnetic flux Φ flowing in the sub-yoke 8, the voltage is linked to the magnetic flux Φ. The output voltage induced in the compensation winding 9 also increases in proportion to this magnetic flux Φ.
In other words, a larger field current is supplied to the field winding 2, the output voltage drop due to the armature reaction of the generator is compensated, and the terminal voltage remains constant as shown by the solid line in Figure 4. Become. The dotted line in the figure represents the field current.

Needless to say, the rate of voltage increase to compensate for this output voltage drop is controlled by the permeance of the newly provided sub magnetic path with respect to the main magnetic path and the number of turns of the voltage compensation winding 9.

Figure 4 I shows the output characteristics of a conventional generator. Since the field current represented by the dotted line is constant, the output is represented by the solid line, where a voltage drop due to armature reaction appears. ing.

In the case of the configuration shown in FIG. 1, paying attention to the fact that the magnetic flux Φ〓 increases as the load current increases, the terminal voltage of the generator is changed as shown in FIG.
I try to keep it at a certain level. From this, the configuration shown in FIG. 1 is sufficiently superior in operation and effect to the configuration shown in FIG. 7. However, there is still room for improvement.

That is, in the case of the configuration shown in FIG. 1, FIG.
As shown in the figure, the field current is increased by the voltage induced in the voltage compensation winding 9 to compensate for the voltage drop in the terminal voltage of the generator due to the increase in the load current. For this reason, it is necessary to select the number of turns of the voltage compensation winding 9 so as to induce a voltage of at least a predetermined level in the voltage compensation winding 9.

The present invention focuses on this point and takes into consideration reducing the number of turns of the voltage compensation winding 9 to the extent possible.

FIG. 5 shows an embodiment of the generator according to the present invention, and numerals 1 to 6 correspond to those in FIG.
8 to 12 correspond to those in FIG.

In another embodiment of the generator according to the present invention shown in FIG. 5, an auxiliary power generation winding connected in series to the power generation winding 6 is also wound around the auxiliary yoke 8. The newly installed sub-yoke 8 operates as a current transformer (CT), and the magnetic flux generated when the load current I flows through the power generation winding 6 wound around the sub-yoke 8 is shown in Fig. 1. As explained above, the magnetic flux Φ flows to the sub-yoke 8. This magnetic flux Φ〓 increases as the load current increases, which is the same as the case shown in Figure 1, but the voltage induced in the auxiliary power generation winding by this increasing magnetic flux Φ〓 also increases in the compensation winding 9. increases as in the case of . The voltage induced in the auxiliary power generation winding is then added to the voltage induced in the power generation winding 6. Therefore, the number of turns of the compensation winding 9 can be reduced.

FIG. 6 shows an example of punching out a stator core. When punching out a stator core 13 from, for example, a band-shaped silicon steel plate, a portion C, which was previously discarded, is used together with the rotor core 14 as shown in FIG. do. Since such members that should be discarded are used, the generator of the present invention improves the yield of silicon steel strips and reduces the manufacturing cost of the generator.

(Effects of the invention) As explained above, according to the invention, the demagnetizing flux generated by the armature reaction is actively utilized, which improves the efficiency of the generator and generates electricity without using semiconductors. Load compensation is done only by the machine itself,
Just having a voltage compensation winding with a relatively small number of turns will keep the terminal voltage constant. Since the sub-yoke members are made of parts that were conventionally disposed of, the generator becomes economical.

[Brief explanation of the drawing]

Figure 1 shows the configuration of the generator considered as the premise of the present invention, Figure 2 shows the demagnetizing flux characteristic curve, Figure 3 shows the magnetic flux characteristic curve generated from the field winding, and Figure 4 I shows the output characteristic curve. , FIG. 5 shows the configuration of an embodiment of the generator according to the present invention, FIG. 6 shows an example of a punched-out stator core, and FIG. 7 shows the configuration of a conventional generator. In the figure, 1 is the rotor, 2 is the field winding, 3 is the magnetic pole,
4 is a yoke, 5 is a stator, 6 is a power generation winding, 7 is a power supply, 8 is a sub-yoke, 9 is a voltage compensation winding, 10 is a rectifier, 11 is a slip ring, 13 is a stator.
The core 14 represents the rotor core.

Claims (1)

[Claims for Utility Model Registration] A rotor around which a field winding is wound, a stator comprising magnetic poles provided opposite to the rotor, and the magnetic poles and a yoke are integrally formed, and the yoke. A generator having a power generation winding wrapped in iron, including a sub-yoke configured to be connected to a stator yoke to form a sub-magnetic path, and having a voltage on the sub-yoke. A compensation winding and an auxiliary power generation winding forming part of the power generation winding are provided, and the voltage generated in the voltage compensation winding is applied to the field winding of the rotor via a rectifier circuit. , A part of the demagnetizing flux generated by the current flowing in the power generation winding wound around the yoke is guided to the auxiliary magnetic path of the auxiliary yoke, and the auxiliary power generation winding wound around the auxiliary yoke and the above A voltage is induced in the voltage compensation winding, and the generator winding and the auxiliary generator winding are connected in series to compensate for the output voltage drop of the generator due to armature reaction. A generator featuring: