JPH0817560B2 - Brushless generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention selects the number of poles of a main generator winding and the number of excitation windings wound around a brushless generator, especially a stator, and The present invention relates to a brushless generator that is a self-excited synchronous generator that can generate power simply by selecting a rotor configuration and forming an annular flow path in an excitation winding.

[Conventional technology]

Conventionally, as a brushless single-phase generator with a simple structure and excellent characteristics, a so-called Nonaka method of rectifying an AC voltage induced in a field winding with a diode to generate a field current for the field winding A generator is known. Then, a brushless two-pole three-phase generator as shown in FIG. 7 was developed by applying the basic principle of the Nonaka generator. In FIG. 7, reference numeral 1 is a stator, 2 is a rotor, 3 is a two-pole three-phase main power generation winding, 4 is a single-phase four-pole excitation winding, 5 is a DC power supply, and 6-1a to 6 -1d is a field core, 6-2a to 6-2d are salient poles, 7a to 7d are field windings, and 8 is a diode.

In the example shown in FIG. 7, field windings 7a to 7d are wound around quadrupole field cores 6-1a to 6-1d provided on the rotor 2. A diode 8 is connected to each of the field windings 7a to 7d, and S, S, N and N magnetic poles are sequentially generated on the salient poles 6-2a to 6-2d to generate the field core 6 described above.
-1a to 6-1d are magnetized.
That is, in the example shown in FIG. 7, when the rotor 2 rotates, the static magnetic field of the exciting winding 4 causes a field current in the direction of the arrow in the field windings 7a to 7d to flow, and The magnetic cores 6-1a to 6-1d are magnetized to form apparently two-pole field poles, and the two-pole / three-phase main power generation winding 3
A three-phase AC output can be obtained.

On the other hand, as the synchronous generator, a self-excited rotating field type (concentrated winding type) generator as shown in FIG. 8 is known.
Since this method has a simple structure, it is widely used in practice. In FIG. 8, reference numeral 9 is a stator, 10 is a rotor, 11 is a stator magnetic pole, 12 is a yoke, 13 is a main generator winding, 14 is an excitation winding, and 15 is an automatic voltage regulator (AVR). ), 16 is a brush slip ring, 17 is a field winding, 18 is a rotor core, and 19 is a salient pole.

In the example shown in FIG. 8, when the rotor 10 rotates, a voltage proportional to the magnetic field intersecting with the excitation winding 14 is induced, which causes a current to flow through the AVR 15 into the field winding 17
Is supplied to the rotor core 18 and is magnetized by the rotor core 18 to obtain an AC output in the two-pole main power generation winding 13.

[Problems to be solved by the invention]

In the example shown in FIG. 8, the field winding 17 wound around the rotor side
On the other hand, since it is necessary to supply the current from the excitation winding 14 on the stator side, it is difficult to omit the brush slip ring 16 (make it brushless).

In addition to this, in the conventional brushless generator shown in FIG. 7, the exciting current to the exciting winding 4 is the external DC power source 5
Is configured to be supplied by. Therefore, in the example shown in FIG. 7, there is a problem that the DC power source 5 is required.

Also, when used with a single-phase load, the load compensation is small, so there was the problem of a large voltage drop when the load current increased.

The present invention aims to solve the above problems.

[Means for solving problems]

The present invention has the following structure.
That is, in a brushless generator having a U-shaped stator as a whole, (i) one of the relationship between the number of poles of the excitation winding and the number of main generator windings wound around the stator is Is an integral multiple of the other, and (ii) the field winding wound around the rotor is not connected to the excitation winding, but the magnetic flux of the number of poles corresponding to the number of poles of the excitation winding and the main power generation. It is configured to generate a magnetic flux with the number of poles corresponding to the number of winding poles. (Iii) The excitation winding is configured to form a ring flow path.

〔Example〕

FIG. 1 shows the structure of an embodiment of a rotating field type self-excited synchronous generator according to the present invention.

In FIG. 1, reference numeral 21 is a stator, 22 is a rotor, and 23 is 2
Pole main generator winding, 24 6-pole excitation winding, 25 rotor core (iron core), 25-a and 25-b salient poles, 26 main field winding, 26
Reference symbol -a is a field auxiliary winding, 27 and 28 are diodes, 30 is a stator pole, and 31 is a yoke.

In the stator 21, an exciting winding 24 is wound around each of the stator poles 30 divided into two, and a main generator winding is connected to a yoke 31 connecting the divided magnetic poles 30 to each other. There are 23 wound. The iron core of the stator 21 is formed by laminating thin sheets of silicon steel containing, for example, 1 to 3.5% silicon. The excitation winding 24 forms an annular flow path without being connected to the field winding.

In the rotor 22, a main field winding 26 and a field auxiliary winding 26-a are wound around a rotor core 25 that rotates about an axis. The rotor core 25 (that is, the rotor 22) has the same number of salient poles 25-a and 25-b as the number of poles of the main power generation winding 23.
The rotor core 25 is formed by stacking punched steel plates.

The stator is separated from the rotor 22 by a predetermined gap.
21 is provided. That is, the stator magnetic pole 30 is opposed to the rotor 22 with a predetermined gap. For this reason, each of the two divided magnetic poles 30 has a substantially semicircular inner peripheral surface. The two magnetic poles 30 are connected by a semi-rectangular yoke 31, and the stator 21 is substantially U-shaped as a whole.

FIG. 2 shows an outline of an armature circuit and a field circuit for the synchronous generator shown in FIG. Further, FIG. 3 shows an equivalent circuit of the field circuit of the rotor 22. The reference numerals in these figures correspond to those in FIG.

That is, the stator 21 has a 2-pole main generator winding 23 and a 6-pole excitation winding.
24 and 6 are wound, and the 6-pole excitation winding 24 is directly short-circuited in the illustrated case to form an annular flow path.

In the case of the illustrated embodiment, the rotor 22 is a main generator winding 23.
The salient poles 25-a having the same number of poles (two poles in the figure)
25-b, a diode 27 is inserted in series in the main field winding 26 to generate the magnetic field of the two poles. Then, the auxiliary field winding 26-a is wound on the salient pole 25-a, and the auxiliary field winding 26-a is also wound.
Are crossed once, wound on salient pole 25-b, and diode 28 is inserted in series in field auxiliary winding 26-a. Further, the field auxiliary winding 26-a is connected to the main field winding 26 such that the anode side of the diode 28 is the anode side of the diode 27. This allows the field auxiliary winding
The 26-a works to strengthen the magnetic pole N formed by the main field winding 26 on the salient pole 25-a surface, and strengthens the magnetic pole S formed by the main field winding 26 on the other salient pole 25-b surface. Work like.

That is, the field auxiliary winding 26-a is wound on the salient pole 25-a with a pitch smaller than twice the pitch of the 6-pole excitation winding 24, and the main field winding is wound via the diode 28. The current flows in the direction that is the sum of the currents flowing in 26, and the salient pole 25-a
A magnetic flux having the same polarity as the magnetic pole formed by the main field winding 26 is generated above. Similarly, the field auxiliary winding 26-a is wound on the salient pole 25-b with a pitch smaller than twice the pitch of the single-phase 6-pole exciting winding 24, and via the diode 28. A current flows in a direction that is the sum of the currents flowing in the main field winding 26, and a magnetic flux having the same polarity as the magnetic pole formed by the main field winding 26 is generated on the salient pole 25-b.

In the case of the example shown in FIG. 1, a current flows in the exciting winding 24 due to the residual magnetism of the rotor 22, and a magnetic flux (six poles) created by this current induces a voltage in the field auxiliary winding 26-a. To be done. This voltage supplies a current to the field auxiliary winding 26-a via the diode 28 and a current to the main field winding 26 via the diode 28.
The main magnetic flux of the pole is created. This main magnetic flux induces a voltage in the main power generation winding 23 wound around two poles, and a load current flows.

Due to the armature reaction of this load current, a voltage is induced in the main field winding 26 and the voltage induced in the main power generation winding 23 is increased, as in the conventional Nonaka generator. On the other hand, the main magnetic flux of the two poles also induces a voltage in the excitation winding 24 wound around the six poles to increase the excitation current. As a result of increasing the magnetic flux of 6 poles by this increased exciting current, the field auxiliary winding 26-
The voltage induced in a increases and the magnetic flux also increases. By repeating the above operation, the output voltage of the main power generation winding 23 is established.

When the magnetic flux generated by the armature reaction interlinks with the main field winding 26, the main field winding 26 is short-circuited by the diode 27, so that the short-circuit current increases and the main magnetic flux of the two poles increases. To increase. For this reason, the voltage generated in the main power generation winding 23 rises and the voltage is compensated.

In addition, the magnetic flux generated by the main field winding 26 is
-Work to strengthen the magnetic flux created by a.

Even if the main generator winding 23 is wound around two poles and the excitation winding 24 is wound around four poles,
Although the waveform is distorted, it is acceptable depending on the specifications.

In the case shown in FIG. 1, the excitation winding 24 may be connected so as to form a return path, and it is not necessary to use the separately excited form as in the case shown in FIG.

Fig. 4 shows the mode of the main power generation winding wound in a 2-pole configuration, and Figs. 5 (A), (B), and (C) show the circulation of the excitation winding wound in a 6-pole configuration. The mode which forms a path | route is shown. Reference numerals 23 and 24 in the figure correspond to those in FIG. 1, 32 is a directly short-circuited return path, 33 is a diode, and the diode 3
Reference numeral 34 denotes a ring flow path formed via 3, and reference numeral 34 denotes a capacitor having a ring flow path formed via the capacitor 34.

In the case of the present invention, a combination of the main power generation winding 23 of FIG. 4 and the excitation winding ring flow path forming mode of any one of FIGS. 5 (A) (B) (C) may be adopted. it can.

In the case shown in FIG. 5 (B), a direct current flows through the excitation winding 24, which induces a voltage on the main field winding 26 or the field auxiliary winding 26-a on the rotor 22. Becomes a shape. In the case shown in FIG. 5 (C), an alternating current flows through the excitation winding 24, which causes a voltage to appear on the main field winding 26 or the field auxiliary winding 26-a on the rotor 22. It will be an induced form. The fifth
When the configuration as shown in FIG. (C) is adopted, the capacitance of the capacitor 34 is larger than the capacitance of the capacitor when the number of poles of the excitation winding 24 and the number of poles of the main power generation winding 23 are equal. It is possible to select a sufficiently small capacity.

FIG. 6 shows an embodiment showing a modification of the embodiment shown in FIG. FIG. 6 corresponds to FIG. 1, and the structure of the rotor 22 is the same as that of FIG.

In Fig. 6, the excitation winding 24 for creating magnetic flux of 6 poles
Is the same pitch as the example shown in FIG.
It is wound so as to form 6 poles on 30 poles of 21.

In the case of the example shown in FIG. 6, the mode of the annular flow path of the excitation winding 24 is formed by the annular flow path forming mode of any one of FIGS. 5 (A), (B) and (C).

〔The invention's effect〕

As described above, according to the present invention, the rotating field synchronous generator can be configured as a brushless generator having a U-shaped stator as a whole.

[Brief description of drawings]

1 is an embodiment of the present invention, FIG. 2 is a schematic configuration of a field circuit of the generator shown in FIG. 1, FIG. 3 is an equivalent circuit, and FIG.
Aspects of the main generator winding wound in a pole configuration, Fig. 5 (A)
(B) and (C) are winding patterns in a 6-pole configuration, FIG. 5 (A)
(B) and (C) are modes in which an annular flow path is formed with respect to the excitation winding wound in a 6-pole configuration, and FIG. 6 is a configuration of a stator in the case of an embodiment representing a modification of the present invention, FIG. 7 and FIG. 8 show the construction of a conventional generator, respectively. In the figure, 21 is a stator, 22 is a rotor, 23 is a main power generation winding, 24 is an excitation winding, 25 is a rotor core, 26 is a main field winding, 26-a is a field auxiliary winding, 27 and 28 are diodes, 30 is a stator pole, 31 is a yoke, 3
3 is a diode and 34 is a capacitor.

Continuation of front page (72) Inventor Hiroshi Kohiyama, No. 3 Hayakawa, Hayakawa, Nitta-cho, Nitta-gun, Gunma Sawafuji Electric Co., Ltd., Nitta factory (56) Reference JP-A-62-23348 (JP, A)

Claims (1)

[Claims] 1. A rotor for generating a magnetic field, two magnetic poles provided facing the rotor, a yoke connecting the magnetic poles, and a main power generation winding wound around the yoke. A brushless generator having a U-shaped stator having an overall shape, and a voltage is induced in the main power generation winding by interlinking the magnetic field generated in the rotor with the main power generation winding. The child is provided with exciting windings wound in the grooves respectively formed on the end faces of the two magnetic poles and interlinking with the magnetic field of the rotor to generate a magnetic field. One of the poles of the generator winding has an integral multiple relationship with the other, and the rotor has a field wound with a pitch smaller than twice the pitch of the excitation winding. It has a magnetic auxiliary winding and a main field winding with the same number of poles as the number of poles of the main power generation winding. In addition, both the main field winding and the field auxiliary winding wound in the groove on the end face of the main field magnetic pole formed by the main field winding respectively generate magnetic fluxes of the same type of pole. A brushless generator characterized in that a diode is connected to generate the current, and the excitation winding has a return path formed so that an excitation current flows.