JP4607293B2 - Generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a generator, particularly a self-excited single-phase AC synchronous generator driven by an engine, in order to introduce a positive phase component in a three-phase AC winding of a delta connection, so that an exciter winding is a so-called open delta type. The present invention relates to a generator having an external characteristic curve that includes a winding structure connected in series and that has a breaker provided on the output side of the generator to detect and cut off when an overcurrent, particularly a short-circuit current flows. Is.
[0002]
[Prior art]
Conventionally, the winding structure of a self-excited single-phase AC synchronous generator driven by an engine employs the winding configuration shown in FIG. That is, in FIG. 5, the stator of 36 slots is wound using slots # 1 to # 6 and # 13 to # 18 and slots # 19 to # 24 and # 31 to # 36, and the outlets {circle around (1)}, The winding 11A is provided with the winding 3A, and is wound using the slots # 1 to # 6 and # 13 to # 18 and the slots # 19 to # 24 and # 31 to # 36 having the same winding structure, and the outlet ▲ The main generator winding 11 connected in series with the outlets {circle around (1)} to {circle around (2)} with the winding 11B having 2 ▼ and {circle around (3)} is wound. The winding 11B indicated by the openings {circle around (2)} to {circle around (3)} has a winding configuration of a constant voltage detection winding used for controlling the output voltage to be constant. The number of conductors “0” such as slot # 5 represents “no winding”.
[0003]
The stator is further wound using slots # 11, # 26 and # 29, # 8 that are substantially 90 ° in electrical angle with these main power generation windings 11, and are taken out from the outlets (4), (8). 5 and an exciter winding 12 of take-out ports (4)-(5) is wound.
[0004]
Although not shown, the voltage induced in the exciter winding 12 is rectified by a rectifier circuit to excite the field winding to generate a predetermined voltage from the main power generation winding 11. This predetermined voltage is At this time, the field current flowing through the field winding is controlled based on the detection voltage detected by the constant voltage detection winding 11B, and the output voltage from the main power generation winding 11 is controlled to be always a constant voltage. It has become so.
[0005]
[Problems to be solved by the invention]
In general, even in a single-phase generator, in order to improve the generated voltage waveform, a braking winding is provided on the field side rotor, and the output voltage waveform due to the fast rotating magnetic field of the armature reaction, particularly the third harmonic having a large influence The waveform is improved so that distortion of the output voltage waveform is reduced by canceling out the above.
[0006]
By the way, in the winding structure of the conventional single-phase AC generator shown in FIG. 5, the exciter winding 2 is wound at the same pitch as the main generator winding 1, so that the influence of the braking winding is affected. It is received in the same manner as the main generator winding 1.
[0007]
For example, when the output voltage is short-circuited, the initial inrush current is large, so that the armature reaction is large, and the effect of canceling out the fast rotating magnetic field by the braking winding is also large. Therefore, the effect is exerted on the exciter winding 12, and the output voltage of the exciter winding 12 is also reduced. As a result, the external characteristic curve becomes a characteristic in which a so-called output voltage is involved, as shown by a one-dot chain line Y in FIG. 4, and when an overcurrent, particularly a short-circuit current at the time of a short circuit, flows in the main generator winding 11, There is a drawback that the breaker provided on the generator side is not cut off due to a winding characteristic in which the output current is extremely reduced.
[0008]
An object of the present invention is to solve the above-mentioned drawbacks, and to provide a generator capable of obtaining a good breaker cutoff characteristic without causing an entrainment characteristic in an output current at the time of overcurrent, particularly at a short circuit. It is aimed.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned object, the generator of the present invention has a single-phase main generator winding wound with a short-pitch winding and a phase difference of substantially 90 ° in electrical angle with respect to the single-phase main generator winding. A stator in which an exciter winding wound at a position is wound, and a rotor in which a brake winding is provided on a skewed rotor core, and a voltage generated in the exciter winding is rectified by a rectifier circuit. In the self-excited generator for supplying power to the magnetic winding, the exciter winding is wound with a short-pitch winding having a winding pitch of about 2/3 and with a short-pitch winding of about 2/3. The exciter windings thus formed are connected in series in an open delta shape in a form lacking one phase in a three-phase AC winding of a delta connection.
[0010]
The exciter winding is a V connection that is wound in a short-pitch winding whose winding pitch is approximately 2/3, and is connected in series in a delta form in a three-phase AC winding with a delta connection, with one phase missing. Therefore, the positive phase component is introduced and is not easily affected by the braking winding.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment winding diagram of a generator according to the present invention.
[0012]
In the figure, the stator of 36 slots is wound using slots # 1 to # 6 and # 13 to # 18 and slots # 19 to # 24 and # 31 to # 36, and the outlets {circle around (1)}, {circle around (3)}. Is wound using slots # 1 to # 6 and # 13 to # 18 and slots # 19 to # 24 and # 31 to # 36 having the same winding structure as the winding 1A provided with. The main generator winding 1 connected in series with the winding 1 </ b> B with the winding 1 </ b> B provided with ▼ and ▲ 3 is wound. The winding 1B indicated by (2)-(3) has a winding configuration of a constant voltage detection winding used for controlling the output voltage to be constant. The number of conductors “0” such as slot # 5 represents “no winding”.
[0013]
The main generator winding 1 generates the same predetermined voltage with the short winding of the same winding method as that of the conventional winding structure of FIG. 5, and the number of conductors is different. This is because the winding method of the exciter winding 2 is different.
[0014]
As shown in FIG. 1, the exciter winding 2 is divided into a winding 2A and a winding 2B, and the winding is as if one phase of a three-phase AC winding of a delta connection is missing. The pitch is approximately 2/3, more precisely, 10/16 (≈2 / 3), and it is wound in a short-pitch winding, and is connected in series with an open delta type to provide outlets (4) and (5). It is wound around the stator so that the voltage generated in the exciter winding 2 is taken out from the outlets (4)-(5).
[0015]
In this three-phase AC winding, the exciter winding 2 consisting of windings 2A and 2B lacking one phase is connected in an open delta shape, and the positive phase is set in the outlets (4) to (5) of the exciter winding 2 A so-called V excitation method is used in which the components are introduced and supplied to the field winding.
[0016]
Furthermore, since the winding pitch of each of the windings 2A and 2B of the exciter winding 2 connected in an open delta shape is about 2/3, the effect of canceling the rotating magnetic field corresponding to the phase advance by the braking winding is alleviated. The decrease in the output voltage of the exciter winding 2 is reduced. That is, the external characteristic curve of the generator having the winding structure of the winding diagram of one embodiment of the generator according to the present invention shown in FIG. 1 is as shown by the solid line X in FIG. When the short circuit occurs, no entanglement characteristic occurs in the output current, and the generator can obtain a good breaker cutoff characteristic.
[0017]
FIG. 2 is an explanatory view of an embodiment of a rotor provided with a braking winding, and FIG. 3 is a right side view thereof.
[0018]
In FIG. 2 and FIG. 3, the rotor 3 in which the field winding is not shown is configured such that a predetermined number of laminated rotor cores 4 are fixed to the shaft 5, and the bars 6 constituting the braking windings are short-circuited. Are respectively provided at both ends thereof. The rotor core 4 fixed to the shaft 5 is skewed and laminated as shown in FIG. 3, and the bar 6 constituting the braking winding is also skewed as shown in FIG. Both ends of the skewed bar 6 are short-circuit fixed to the side plate 7 by brazing or the like.
[0019]
In this way, the rotor 3 having the rotor core 4 and the bar 6 constituting the brake winding also skewed freely rotates in the stator of the winding structure described in FIG. 1 described above, and is indicated by a solid line X in FIG. In the vicinity of the rated current I _1, a constant output voltage can be obtained, and in the case of an overload, especially when a short circuit occurs, the output current does not cause any entanglement and the overcurrent extends, resulting in a good breaker cutoff. Characteristics can be obtained.
[0020]
【The invention's effect】
As described above, according to the present invention, the winding pitch of the exciter winding is wound with a short-pitch winding of approximately 2/3, and the so-called V excitation method, that is, winding with a short-pitch winding of approximately 2/3. Reduced field current flowing in the field winding by introducing a positive phase component by connecting the rotated exciter winding in series with an open delta configuration in a three-phase AC winding with a delta connection, with one phase missing. Therefore, when an overcurrent such as a short-circuit current flows, no entanglement characteristic occurs in the external characteristic curve of the generator, and the breaking characteristic of the breaker provided on the generator side can be exhibited. The generator and load side equipment are protected.
[Brief description of the drawings]
FIG. 1 is a winding diagram of an embodiment of a generator according to the present invention.
FIG. 2 is an explanatory diagram of an embodiment of a rotor provided with a braking winding.
FIG. 3 is a right side view thereof.
FIG. 4 is an external characteristic curve comparison diagram between the generator of the present invention and a conventional generator.
FIG. 5 is a winding diagram of a stator used in a conventional generator.
[Explanation of symbols]
1 Main generator winding 2 Exciter winding 3 Rotor 4 Rotor core 5 Shaft 6 Bar 7 Side plate

Claims (1)

A single-phase main generator winding wound with a short-pitch winding and an exciter winding wound at a position substantially having an electrical angle of 90 ° with respect to the single-phase main generator winding were wound. In a self-excited generator that includes a stator and a rotor provided with a braking winding on a skewed rotor core, rectifies the voltage generated in the exciter winding by a rectifier circuit, and supplies power to the field winding.
The exciter winding is wound with a short-pitch winding whose winding pitch is approximately 2/3,
An exciter winding wound with a short-pitch winding of about 2/3 is connected in series in an open delta shape in a form lacking one phase in a three-phase AC winding of a delta connection. Generator.

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