JPH0773423B2 - Generator - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a generator, and more particularly to a small generator using a stator in which a magnetic pole part and a yoke part are integrally formed. The present invention relates to a generator having a so-called outer iron type structure configured in a square shape and having an exciter winding at the position of the magnetic pole portion facing the rotor.

[Background and problems of the invention]

A conventional generator using a core in which a magnetic pole portion and a yoke portion are integrally formed has a structure shown in FIG. That is, in FIG. 8, reference numeral 21 is a stator, and the stator 21 is composed of stator cores 21a and 21b, and each of the stator cores 21a, 21b is provided with a magnetic pole portion facing the rotor 2. 3, 4 are formed, and the yoke portion 5 connecting these magnetic pole portions 3, 4 forms an integral U-shaped stator as shown in FIG. Stator core 21a, 21
Although not shown in the figure, b is fitted with and integrated with the yoke portion 5, and a generator winding 6 and an exciter winding 8 are wound around the rotor 2. A field winding 7 is wound around the rotor 2. Has been done.

The generator having such a configuration supplies a field current from the outside to the rotating field winding 7 via a slip ring (not shown), for example, and shows the voltage generated in the exciter winding 8 in the figure. A constant voltage AC voltage is generated in the power generation winding 6 by controlling the field current by, for example, a self-exciting power generation method in which the field winding 7 is supplied after being rectified by a non-rectifier. ing.

To increase the power generation winding 6 and the exciter winding 8 wound around the yoke portion 5, the power generation winding 6 and the exciter winding 8 are wound in advance on a linear bobbin (not shown). , When forming the stator 21 with the stator cores 21a and 21b, the yoke portion 5
The bobbin around which the power generation winding 6 and the exciter winding 8 are wound is inserted into the coil, and the stator cores 21a and 21b are fitted together to be wound and assembled. Therefore, the conventional generator is characterized by its simple structure and good assembling.

However, if you want to provide an auxiliary power generation winding that is separate from the power generation winding 6, there is no alternative but to wind it around the yoke section 5, and all the windings can be wound only in the same phase as the power generation winding 6. There is a drawback that it is not possible to deal with a system that requires a winding with a phase different from that of the generator winding, such as a generator that uses a phase-advancing current, and it is not possible to realize a brushless structure generator.

When the load current increases, the armature reaction substantially increases the magnetic resistance of the yoke portion 5 through which the illustrated magnetic flux Φ passes.
For this reason, the voltage induced in the exciter extension wire 8 is lowered, and the load current-output voltage characteristic becomes a so-called entrainment characteristic as shown by the curve B in FIG. That is, as the load current increases, the voltage generated in the exciter winding 8 decreases, as a result, the field current supplied to the field winding 7 decreases, and the voltage generated in the generator winding 6 decreases. However, finally, the above-mentioned involvement occurs. For this reason, for example, when the generator shown in FIG. 9 is started with a relatively large load, the voltage may not rise.

[Object and Structure of Invention]

The present invention is intended to solve the above-mentioned drawbacks, and the conventional generator has a simple structure and good assembling characteristics, while generating a voltage with a phase different from that of the generator winding. The purpose is to provide a machine. Therefore, the generator of the present invention has a rotor having salient poles for generating a magnetic field of two poles, a field winding wound around the salient poles, and a two-pole salient provided so as to face the rotor. A stator in which poles are provided in the yoke portion so as to face each other, and a magnetic pole portion having the salient poles and a yoke portion that joins the magnetic pole portion are integrally formed; and a generator winding wound on the stator In the generator, the stator is configured as an outer iron type, and the power generation winding is wound in a concentrated winding around the base of one salient pole protruding from the yoke portion toward the rotor. A slot is provided at the facing surface position of the two salient poles on the stator facing the rotor while being rotated, and an exciter winding is wound around the slot and the outer circumference of the salient pole. Different voltage and phase generated in generator winding It is characterized in that a field voltage is generated and a field current is supplied to the field winding in a self-excited manner by the voltage generated in the exciter winding. Hereinafter, description will be given with reference to the drawings.

Example of Invention

FIG. 1 is a constitution of an embodiment of a generator according to the present invention, and FIGS. 2 (A) and (B), FIGS. 3 and 4 are explanations for explaining the operation of the generator having the constitution shown in FIG. 1, respectively. FIG. 5 is a modification corresponding to the structure shown in FIG. 1, FIG. 6 is an explanatory view for explaining a mode in which the generator having the structure shown in FIG. 1 or the structure shown in FIG. 5 is applied, and FIG. The explanatory view explaining the load current-output voltage characteristic in the generator of the present invention is shown.

In FIG. 1, reference numeral 1 corresponds to the stator, and 2 to 7 correspond to those of FIG. 8 already described. In the stator cores 1a and 1b constituting the stator 1, the yoke portion 5 has a □ -shaped outer iron type structure, and the magnetic pole portions 3 and 4 are inward from the □ -shaped yoke portion 5 toward the inside. It projects so as to face 2.
Slots 9 and 10 are provided in the central portions of the magnetic pole portions 3 and 4 on the side facing the rotor 2, and exciter windings 11 and 12 are wound around the slots 9 and 10.

FIG. 2 (A) shows the angular position of the rotor 2 where the magnetic flux Φ ₁ intersecting the power generation winding 6 is maximum. Further, FIG. 2B shows the angular position of the rotor 2 where the magnetic flux Φ ₂ intersecting the exciter windings 11 and 12 is maximum. As can be seen from the state shown in FIG. 2 (A), the magnetic flux Φ ₁ intersects with the power generation winding 6 to induce a voltage in the power generation winding 6, but the rotor 2 has the angle shown in FIG. 2 (B). When in the position, the magnetic flux Φ ₂ does not intersect with the generator winding 6 and
In 3 and 4, so to speak, it passes through the leakage magnetic path.
Fig. 3 shows the voltage generated in the generator winding 6 and the exciter winding 1
This is a vector diagram showing the phase relationship with the voltage generated at 1 and 12, and there is a phase difference of 90 ° between the two, and the structure of a so-called Nonaka generator can be adopted. It will be possible.

FIG. 4 shows a mode in which the armature reaction due to the load current flowing in the power generation winding 6 works. The illustrated magnetic flux Φ ₃ represents the magnetic flux generated by the load current. As can be seen from the figure, the magnetic flux Φ ₃ due to the armature reaction is extremely increased,
Accordingly, even if the magnetic resistance of the magnetic path formed by the yoke portion 5 becomes large, the magnetic flux Φ ₂ shown in FIG. 2 (B) and FIG.
Can pass regardless of the increase in the magnetic resistance of the yoke portion 5, so to speak. Therefore, the induced voltage generated in the exciter windings 11 and 12 will not be undesirably reduced. That is, when the structure of the generator shown in FIG. 1 is adopted, the load current-output voltage characteristic of the generator is such a characteristic that no entrainment occurs as indicated by the curve A shown in FIG.

Further, as described above, the voltage obtained by combining the voltages generated in the exciter windings 11 and 12 is approximately 90% of the voltage generated in the generator winding 6.
Because of the phase difference of ゜, as shown in the circuit diagram of Fig. 6, the condenser 13 is connected to the exciter windings 11 and 12, and the diode 14 is connected to the field winding 7, so that the so-called Nonaka type brush is used. It becomes possible to use it for the generator with the none structure. Further, when the generator as shown in FIG. 6 is constructed, as can be seen by comparing the mode shown in FIG. 2 (A) and the mode shown in FIG. 2 (B), the exciter windings 11 and 12 are shown. The current flowing through the capacitor 13 when the capacitor 13 is connected to the capacitor 13 has little influence on the voltage waveform of the voltage induced in the generator winding 6. Therefore, the third harmonic component generated on the exciter windings 11 and 12 can be positively used, and the capacity of the connected capacitor 13 can be reduced. Also, because of the outer iron type structure, the entire winding is housed inside the yoke section.

FIG. 5 shows a modified example corresponding to the configuration shown in FIG. 1, and the reference numerals in the figure correspond to those in FIG. In the case shown in FIG. 5, only the position of the exciter winding 12 is changed from that in the case shown in FIG. 1, and the others are the same and the operation is also the same.

〔The invention's effect〕

As described above, according to the present invention, the exciter winding can be wound at a position having a phase different from that of the power generating winding to generate voltages having different phases. By connecting a capacitor to the exciter winding and connecting a rectifying diode to both ends of the field winding wound around the rotor,
It is possible to easily realize a so-called Nonaka generator, a self-excited brushless generator. Further, since the generator of the present invention has a so-called outer iron type structure, the winding is not undesirably damaged as well as the effect that the structure is simple and the assembling is good.

[Brief description of drawings]

FIG. 1 is a constitution of an embodiment of a generator according to the present invention, and FIGS. 2 (A) and (B), FIGS. 3 and 4 are explanations for explaining the operation of the generator having the constitution shown in FIG. 1, respectively. FIG. 5 is a modification corresponding to the structure shown in FIG. 1, FIG. 6 is an explanatory view for explaining a mode in which the generator having the structure shown in FIG. 1 or the structure shown in FIG. 5 is applied, and FIG. FIG. 8 is an explanatory view for explaining load current-output voltage characteristics in the generator of the present invention, and FIG. 8 shows a conventional structure. In the figure, 1 is a stator, 2 is a rotor, 3 and 4 are magnetic pole parts, 5 is a yoke part, 6
Is a power generation winding, 7 is a field winding, and 11 and 12 are exciter windings.

Claims (1)

[Claims] 1. A rotor having a salient pole for generating a two-pole magnetic field, a field winding wound around the salient pole, and a two-pole salient pole provided facing the rotor. Generator provided with a magnetic pole part having the salient pole and a yoke part connecting the magnetic pole part integrally with each other, and a power generation winding wound on the stator. In the machine, the stator is configured as an outer iron type, and the generator winding is wound in concentrated winding on the base of one salient pole protruding from the yoke portion toward the rotor side. , A slot is provided at a facing surface position of the two salient poles on the stator facing the rotor, and an exciter winding is wound around the slot and the outer circumference of the salient pole. Generate a voltage whose phase is different from that of the generated voltage. And a generator, characterized in that by the exciter winding voltage generated was to supply the field current to the field winding in the self-excited.