JPH0524741B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a generator, particularly a small generator using a U-shaped stator core in which a magnetic pole part and a yoke part are integrally formed. This invention relates to a generator in which a part of the exciter winding is provided with a commutating pole and a part of the exciter winding is wound to eliminate the so-called winding characteristic in the load current-output voltage characteristic.

[Background of the invention and problems]

A conventional generator using a core in which a magnetic pole part and a yoke part are integrally formed has a structure shown in FIG. 5. That is, in FIG. 5, reference numeral 21 denotes a stator, and the stator 21 is composed of stator cores 21a and 21b. Each stator core 21a, 21b has a magnetic pole part provided opposite to the rotor 2. 3 and 4 are formed, and a yoke portion 5 connecting these magnetic pole portions 3 and 4 has a fitting structure to form an integral U-shaped stator as shown in FIG. Stator core 21
Although not shown, a and 21b are fitted together. The integrated yoke part 5 has a power generation winding 6.
and an exciter winding 8 are wound around the rotor 2, and a field winding 7 is wound around the rotor 2.

A generator with such a configuration supplies a field current to the rotating magnetic winding 7 from the outside via, for example, a slip ring (not shown), and also supplies a voltage generated in the exciter winding 8 (not shown). For example, in a self-excited power generation system, the field current is rectified by a rectifier and then supplied to the field winding 7. By controlling the field current, a constant AC voltage is generated in the power generation winding 6. ing.

The power generation winding 6 and the exciter winding 8 are wound around the yoke part 5 by winding the power generation winding 6 and the exciter winding 8 on a straight bobbin (not shown) in advance. , stator core 21a, 21b
When forming the stator 21, the bobbin on which the power generation winding 6 and the exciter winding 8 are wound is inserted into the yoke part 5, and the bobbin winding is performed by fitting the stator cores 21a and 11b. equipped and assembled. Therefore, the conventional generator is characterized by a simple structure and easy assembly.

However, if you want to install an auxiliary power generation winding separate from the power generation winding 6, the only way is to wind it around the yoke part 5, and all the windings can only be wound in the same phase as the power generation winding 6, so for example, the so-called nonaka type It has the disadvantage that it cannot handle systems that require a winding with a phase different from the power generation winding, such as generators that use phase-advanced current, and it is also impossible to realize a generator with a brushless structure.

Further, when the load current increases, the magnetic resistance of the yoke portion 5 through which the illustrated magnetic flux Τ passes is substantially increased due to the armature reaction. For this reason, the voltage induced in the exciter winding 8 decreases, and the load current-output voltage characteristic becomes a so-called curling characteristic as shown by curve B in FIG. That is, as the load current increases, the voltage generated in the exciter winding 8 decreases as described above, and as a result, the field current supplied to the field winding 7 decreases, and the voltage generated at the generator end 6 decreases. This will eventually lead to entrainment as described above. For this reason, for example, when attempting to start the generator shown in FIG. 5 with a relatively large load, the voltage may not rise.

[Purpose and structure of the invention]

The present invention aims to solve the above-mentioned drawbacks, and while retaining the features of the conventional generator with simple structure and good assembly, the present invention is capable of generating a voltage that is out of phase with the generator winding. The purpose is to provide an opportunity. Therefore, the generator of the present invention includes a rotor that generates a magnetic field, a magnetic pole provided opposite to the rotor, and a magnetic pole part having the magnetic pole and a yoke part that connects the magnetic pole part are integrally formed. In the generator, the stator is provided with a commutative pole protruding from the yoke toward the rotor, and the stator is configured in a chevron shape. A first winding wound on the yoke portion and a second winding wound on the commutative pole are used as exciter windings, and serve as an excitation source for generating a magnetic field on the rotor, and the yoke A power generation winding having an output terminal is wound on the part at a position symmetrical about the commutative pole with respect to the position where the first winding is wound. This will be explained below with reference to the figures.

[Embodiments of the invention]

FIGS. 1A and 1B are diagrams showing the structure of an embodiment of the generator according to the present invention and explaining its operation, and FIGS. 2 and 3 are views each showing a mode to which the generator having the structure shown in FIG. 1 is applied. FIG. 4 is an explanatory diagram illustrating load current-output voltage characteristics in the generator of the present invention.

In FIGS. 1A and B, numeral 1 is the stator, 2
7 to 7 correspond to those shown in FIG. 5, which have already been explained. Stator core 1 that constitutes stator 1
a and 1b are stator cores 21a and 21 in FIG.
b, and forms an integral U-shaped stator together with the yoke portion 5 as shown in FIG. A commutating pole 9 is provided from, for example, a substantially central position of the yoke portion 5 toward the rotor 2. As a result, the stator becomes chevron-shaped as a whole. Furthermore, a power generation winding 6 and a first power generation winding 8-1 are wound around stator cores 1a and 1b, which are located symmetrically with respect to the commutating pole 9, respectively.
That is, the power generation winding 6 is wound, for example, on a yoke on the stator core 1a side, and has an output terminal 10.
Further, a first winding 8-1 is wound on the yoke on the stator core 1b side, and a second winding 8-2 is wound on the commutative pole 9, and both windings Line 8-
1 and 8-2 are connected in series and act as an exciter winding corresponding to the exciter winding 8 shown in FIG. 11 represents the output terminal of the exciter winding.

In the case of the generator having the structure shown in FIG. 1, a voltage is induced in the generating winding 6 by the magnetic fluxes Ф ₁ and Ф ₂ shown in FIG. 1A, but the rotor 2 has a rotation angle shown in FIG. In this position, the magnetic flux Τ ₂ passes through the commutator 9 without intersecting the power generation winding 6, forming a so-called leakage flux. However, the magnetic flux Ф ₂ is in the first winding 8
-1 and the second winding 8-2. Therefore, even if the load current increases and the magnetic resistance of the yoke on the stator core 1a side increases due to armature reaction, the magnetic flux Ф ₂ in the state shown in FIG. Based on the voltage induced in the second winding 8-2, the output terminal 11 of the exciter winding
The voltage appearing at can be maintained at the voltage level shown in the example. Therefore, the load current-output voltage characteristic in the case of the generator shown in FIG. 1 becomes a characteristic that does not cause winding, as shown by curve A shown in FIG. 4.

In addition, in the case of the generator shown in Figure 1, the power generation winding 6
For example, when the rotor 2 is at the same angular position as shown in FIG. 5, the magnetic flux intersects the most. At the corner position shown in FIG. 1B, the shape intersects the magnetic flux the most. For this reason, the voltage appearing at the output terminal 10 of the generator winding 6 and the voltage appearing at the output terminal 11 of the exciter winding are:
They have different phases.

For this reason, in the case of the power generation structure shown in Figure 1,
As shown in the circuit diagram shown in FIG. 2, a capacitor 12 is connected to the output terminal 11 of the exciter winding, and a diode 13 is connected to the rotating winding 7 to create a generator with a so-called Nonaka type brushless structure. It becomes possible to use it for Of course, as shown in Figure 3, the rectifier circuit 1 is connected to the output terminal 11 of the exciter winding.
Needless to say, it can also be used as a generator that supplies direct current to the field winding 7 through the slip ring 15.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a generator that does not cause convergence in the load current-output voltage characteristics, and it is also possible to configure a so-called Nonaka type generator.

[Brief explanation of the drawing]

FIGS. 1A and 1B are diagrams showing the structure and operation of an embodiment of the generator according to the present invention, and FIGS. 2 and 3 each illustrate a mode in which the generator having the structure shown in FIG. 1 is applied. FIG. 4 is an explanatory diagram illustrating load current-output voltage characteristics in the generator of the present invention, and FIG. 5 shows a conventional structure. In the figure, 1 is a stator, 1a and 1b are stator cores, 2 is a rotor, 5 is a yoke, 6 is a power generation winding, 7 is a field winding, 8-1 and 8-2 are exciter windings, 9 is a complementary pole.

Claims (1)

[Scope of Claims] 1. A stator comprising a rotor that generates a magnetic field, a magnetic pole provided opposite to the rotor, and a magnetic pole section having the magnetic pole and a yoke section connecting the magnetic pole section integrally formed. and a generator winding wound around the stator, the stator is configured in a chevron shape by providing a commutative pole protruding from the yoke toward the rotor, and A first winding wound on the iron part and a second winding wound on the commutative pole are used as exciter windings, and serve as an excitation source for generating a magnetic field on the rotor, and on the yoke part. A generator characterized in that a power generation winding having an output terminal is wound at a position symmetrical about the interpolation axis with respect to a position at which the first winding is wound.