JP6243968B1 - Generator - Google Patents

Abstract

A generator capable of simultaneously outputting three-phase four-wire power and single-phase three-wire power and reducing distortion of each voltage waveform of the three-phase four-wire power and the single-phase three-wire power is provided. A U-phase coil, a V-phase coil, and a W-phase coil are Y-connected. The U-phase coil 2 includes two U-phase split coils 21 and 22 connected in series, and the voltage generated in the U-phase split coil 22 is about 60 ° relative to the voltage generated in the U-phase split coil 21. It is configured to have a phase difference. The V-phase coil 3 and the W-phase coil 4 have the same configuration. The additional coil 5 includes two additional divided coils 51 and 52 connected in series, and the voltage generated in the additional divided coil 52 has a phase difference of 60 ° with respect to the voltage generated in the additional divided coil 51. The vector sum of the voltages generated in the additional split coils 51 and 52 is ½ of the vector sum of the voltages generated in the U-phase split coils 21 and 22 and has a phase difference of 180 °. ing. [Selection] Figure 1

Description

  The present invention relates to a generator capable of simultaneously outputting both three-phase power and single-phase power.

  For example, portable generators equipped with engines are widely used outdoors such as construction sites and event venues. Large motors and pumps used outdoors operate with three-phase power, and lighting fixtures and power tools operate with single-phase power. Therefore, some portable generators can output both three-phase power (for example, three-phase 200V) and single-phase power (for example, single-phase 200V).

  In a generator that can output both three-phase power and single-phase power, for example, as shown in FIG. 5, each end of the U-phase coil 101, V-phase coil 102, and W-phase coil 103 is at a neutral point O. The U-phase coil 101, the V-phase coil 102, and the W-phase coil 103 are Y-connected (star-connected) with a phase difference of 120 electrical degrees. The other ends of U-phase coil 101, V-phase coil 102, and W-phase coil 103 are connected to output terminals U, V, and W, respectively. The neutral point O includes one of the U-phase coil 101, the V-phase coil 102, and the W-phase coil 103, for example, 180 in a magnitude that is ½ of the voltage generated in the U-phase coil 101. One end of an additional coil 104 that generates a voltage having a phase difference of ° is connected. The other end of the additional coil 104 is connected to the output terminal N.

  Thereby, the three-phase four-wire power can be output from the neutral point O and the output terminals U, V, and W. At the same time, single-phase three-wire power can be output from the output terminals V, W, and N.

JP 2010-259211 A

  However, in such a configuration, when third harmonics are generated in each of the U-phase coil 101, the V-phase coil 102, the W-phase coil 103, and the additional coil 104, the three-phase four-wire power and the single-phase three-wire power voltages Distortion due to the third harmonic occurs in the waveform, particularly the voltage waveform of single-phase three-wire power.

  An object of the present invention is to obtain three-phase four-wire power and single-phase three-wire power with a voltage waveform that can output three-phase four-wire power and single-phase three-wire power at the same time and that are less distorted by the third harmonic. It is possible to provide a generator.

To achieve the above object, a generator according to the present invention includes an even number of first phase split coils connected in series, one end connected to a neutral point, and the other end connected to a first output terminal. A first phase coil configured such that a voltage generated in the remaining half of the first phase split coils has a phase difference of 60 ° with respect to a voltage generated in the half of the first phase split coils. An even number of second phase split coils connected, one end connected to the neutral point, the other end connected to the second output terminal, and the remaining voltage with respect to the voltage generated in half of the second phase split coils The vector sum of the voltage generated in the second phase split coil with respect to the vector sum of the voltage generated in the first phase split coil when the voltage generated in half of the second phase split coils has a phase difference of 60 ° Are the same size and are configured to have a phase difference of 120 ° , Having an even number of third phase split coils connected in series, one end connected to a neutral point, the other end connected to a third output terminal, and a voltage generated by half of the third phase split coils The voltage generated in the remaining half of the third phase split coils has a phase difference of 60 °, and the vector sum of the voltages generated in the first phase split coils and the voltage vector generated in the second phase split coils A third phase coil configured such that the vector sum of voltages generated in the third phase split coil for each of the sums is the same magnitude and has a phase difference of 120 °, and an even number of additional elements connected in series A split coil is provided, one end is connected to the neutral point, the other end is connected to the fourth output terminal, and the voltage generated in the remaining half of the additional split coils is 60 with respect to the voltage generated in the half of the additional split coils. ° phase difference and the first phase split coil Look contains a single additional coil configured to have a phase difference of the vector sum 180 ° in magnitude of 1/2 of the voltage generated in the additional split coil with respect to the vector sum of the voltage generated in, medium Three-phase four-wire power is obtained using the sex point, the first output terminal, the second output terminal, and the third output terminal, and the single phase using the second output terminal, the third output terminal, and the fourth output terminal. Three-wire power is obtained .

  According to this configuration, the first phase coil, the second phase coil, and the third phase coil are Y-connected by connecting one end thereof to the neutral point. The other ends of the first phase coil, the second phase coil, and the third phase coil are connected to the first output terminal, the second output terminal, and the third output terminal, respectively.

  In the first phase coil, an even number of first phase split coils are connected in series, and the voltage generated in the remaining half of the first phase split coils is equal to the voltage generated in half of the first phase split coils. It is configured to have a phase difference of 60 °. As a result, the third harmonic generated in the half of the first phase split coils and the third harmonic generated in the remaining half of the first phase split coils cancel each other.

  In the second phase coil, an even number of second phase split coils are connected in series, and the voltage generated in the remaining half of the second phase split coils with respect to the voltage generated in half of the second phase split coils. It is configured to have a phase difference of 60 °. As a result, the third harmonic generated in half of the second phase split coils and the third harmonic generated in the remaining half of the second phase split coils cancel each other.

  In the third phase coil, an even number of third phase split coils are connected in series, and the voltage generated in the remaining half of the third phase split coils is equal to the voltage generated in half of the third phase split coils. It is configured to have a phase difference of 60 °. As a result, the third harmonic generated in the half of the third phase split coils and the third harmonic generated in the remaining half of the third phase split coils cancel each other.

  The vector sum of the voltages generated in the first phase split coil, the vector sum of the voltages generated in the second phase split coil, and the vector sum of the voltages generated in the third phase split coil are the same magnitude and about 120 °. Has a phase difference.

  Therefore, using the neutral point, the first output terminal, the second output terminal, and the third output terminal, it is possible to obtain three-phase four-wire power having a voltage waveform close to a sine wave with little distortion due to the third harmonic. .

  One end of the additional coil is connected to the neutral point. The other end of the additional coil is connected to the fourth output terminal. As for the additional coil, an even number of additional divided coils are connected in series, and the voltage generated by the remaining half of the additional divided coils has a phase difference of 60 ° with respect to the voltage generated by half of the additional divided coils. It is configured. As a result, the third harmonic generated in half of the additional divided coils and the third harmonic generated in the remaining half of the additional divided coils cancel each other. The additional coil has a phase difference of 180 ° with the vector sum of the voltage generated in the additional divided coil being ½ the vector sum of the voltage generated in the first phase divided coil.

  Therefore, using the second output terminal, the third output terminal, and the fourth output terminal, it is possible to obtain single-phase three-wire power having a voltage waveform close to a sine wave with little distortion due to the third harmonic.

  According to the present invention, three-phase four-wire power and single-phase three-wire power can be simultaneously output, and three-phase four-wire power and single-phase three-wire power having a voltage waveform with less distortion due to the third harmonic can be obtained. It is possible to provide a generator.

It is a connection diagram of the armature coil of the generator concerning one embodiment of the present invention. It is a voltage vector diagram of an armature coil. It is a wave form diagram of the 3rd harmonic with respect to A fundamental wave, B fundamental wave, the 3rd harmonic with respect to A fundamental wave, and B fundamental wave. It is a voltage vector diagram of the armature coil which concerns on a modification. It is a connection diagram of the armature coil of the conventional generator.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a connection diagram of armature coils 2, 3, 4, and 5 of a generator 1 according to an embodiment of the present invention. FIG. 2 is a voltage vector diagram of the armature coils 2, 3, 4, and 5.

  The generator 1 includes a U-phase coil (R-phase coil) 2, a V-phase coil (S-phase coil) 3, a W-phase coil (T-phase coil) 4 and an additional coil 5 as armature coils. The U-phase coil 2, the V-phase coil 3, and the W-phase coil 4 are Y-connected (star-connected) by connecting one end thereof to a neutral point O. The other ends of the U-phase coil 2, the V-phase coil 3 and the W-phase coil 4 are connected to the first output terminal U, the second output terminal V and the third output terminal W, respectively. One end of the additional coil 5 is connected to the neutral point O, and the other end is connected to the fourth output terminal N.

  The U-phase coil 2 includes two U-phase split coils 21 and 22 connected in series. As shown in FIG. 3, the U-phase coil 2 corresponds to a voltage (A fundamental wave) generated in one U-phase split coil 21. The voltage (B fundamental wave) generated in the other U-phase split coil 22 is configured to have a phase difference of 60 °. As a result, the third harmonic generated in one U-phase split coil 21 (third harmonic with respect to the A fundamental wave) and the third harmonic generated in the other U-phase split coil 21 (third harmonic with respect to the B fundamental wave). Waves) cancel each other.

  The V-phase coil 3 includes two V-phase split coils 31 and 32 connected in series. As shown in FIG. 3, the V-phase coil 3 corresponds to a voltage (A fundamental wave) generated in one V-phase split coil 31. Thus, the voltage (B fundamental wave) generated in the other V-phase split coil 31 has a phase difference of 60 °. As a result, the third harmonic generated in one V-phase split coil 31 (the third harmonic relative to the A fundamental wave) and the third harmonic generated in the other V-phase split coil 32 cancel each other.

  The W-phase coil 4 includes two W-phase split coils 41 and 42 connected in series. As shown in FIG. 3, the W-phase coil 4 corresponds to a voltage (A fundamental wave) generated in one W-phase split coil 41. Thus, the voltage (B fundamental wave) generated in the other W-phase split coil 41 has a phase difference of 60 °. As a result, the third harmonic generated in one W-phase split coil 41 (third harmonic with respect to the A fundamental wave) and the third harmonic generated in the other W-phase split coil 42 (third harmonic with respect to the B fundamental wave). Waves) cancel each other.

  U-phase split coils 21 and 22, V-phase split coils 31 and 32, and W-phase split coils 41 and 42 are coils having the same configuration (the same number of turns). The U-phase coil 2, the V-phase coil 3 and the W-phase coil 4 are a vector sum of voltages generated in the U-phase split coils 21 and 22, a vector sum of voltages generated in the V-phase split coils 31 and 32, and a W-phase. Y connections are made so that the vector sum of the voltages generated in the split coils 41 and 42 has a phase difference of 120 °.

  As a result, the generator 1 uses the neutral point O, the first output terminal U, the second output terminal V, and the third output terminal W to form a three-phase four-wire with a voltage waveform that is less distorted by the third harmonic. It is possible to obtain power, that is, three-phase four-wire power having a voltage waveform close to a sine wave.

  The additional coil 5 includes two additional divided coils 51 and 52 connected in series. As shown in FIG. 3, the additional coil 5 has a voltage (A fundamental wave) generated in one additional divided coil 51 on the other side. The voltage (B fundamental wave) generated in the additional division coil 52 is configured to have a phase difference of 60 °. Accordingly, the third harmonic generated in one additional division coil 51 (third harmonic with respect to the A fundamental wave) and the third harmonic generated in the other additional division coil 52 (third harmonic with respect to the B fundamental wave). And cancel each other. The number of turns of the additional division coils 51 and 52 is ½ of the number of turns of the U-phase division coils 21 and 22, the V-phase division coils 31 and 32, and the W-phase division coils 41 and 42. The vector sum of the voltages generated in the additional split coils 51 and 52 is ½ of the vector sum of the voltages generated in the phase split coils 21 and 22 and has a phase difference of 180 °.

  Therefore, using the second output terminal V, the third output terminal W, and the fourth output terminal N, a single-phase three-wire power having a voltage waveform with little distortion due to the third harmonic, that is, a single voltage waveform close to a sine wave. Phase 3 wire power can be obtained.

  For example, as shown in FIG. 2, when three-phase four-wire power of 200 V is output, the line voltage of each phase (the voltage between the first output terminal U and the second output terminal V, the second output The voltage between the terminal V and the third output terminal W and the voltage between the third output terminal W and the first output terminal U) are 200 V, respectively, for each phase of the U phase, the V phase, and the W phase. The voltage is about 115.47 V (200 V / √3).

  Further, the voltage between the neutral point O and the fourth output terminal N is 57.735 V, which is 1/2 the magnitude of the U-phase voltage (115.47 V). Therefore, the voltage between the second output terminal V and the fourth output terminal N and the voltage between the third output terminal W and the fourth output terminal N are about 100 V (57.735 V × √3), respectively. Become.

  Therefore, the generator 1 can simultaneously output, for example, three-phase 200V three-phase four-wire power and single-phase 200V single-phase three-wire power.

  As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, as shown in a voltage vector diagram in FIG. 4, U-phase coil 2 may be configured to include four U-phase split coils 21 and 22 connected in series. In this case, the U-phase coil 2 has a phase difference of 60 ° with respect to the voltage generated in the remaining two U-phase split coils 22 with respect to the voltage generated in the two U-phase split coils 21 which are half. Configured. Similarly, the V-phase coil 3 may be configured to include four V-phase split coils 31 and 32 connected in series, and the W-phase coil 4 may include four W-phases connected in series. The structure provided with the split coils 41 and 42 may be sufficient.

  Further, the numbers of the U-phase split coils 21 and 22, the V-phase split coils 31 and 32, and the W-phase split coils 41 and 42 are not limited to two or four, and may be an even number of six or more.

  Furthermore, the additional coil 5 may be configured to include four or more even number of additional divided coils 51 and 52 connected in series. In this case, the additional coil 5 is configured such that the voltage generated by the remaining half of the additional divided coils 52 has a phase difference of 60 ° with respect to the voltage generated by the half of the additional divided coils 51.

  The additional coil 5 has a phase difference of 180 ° with the vector sum of the voltages generated in the additional divided coils 51 and 52 being ½ the vector sum of the voltages generated in the U-phase divided coils 21 and 22. However, the vector sum of the voltages generated in the additional split coils 51 and 52 is 1/2 the magnitude of the vector sum of the voltages generated in the V-phase split coils 31 and 32. It may be configured to have a phase difference of 180 °, or the vector sum of the voltages generated in the additional divided coils 51 and 52 is ½ with respect to the vector sum of the voltages generated in the W-phase divided coils 41 and 42. It may be configured to have a phase difference of 180 ° with a magnitude of.

  In the generator 1, three-phase four-wire power can be obtained using the neutral point O, the first output terminal U, the second output terminal V, and the third output terminal W, but the first output terminal Using U, the second output terminal V, and the third output terminal W, three-phase four-wire power can also be obtained. In addition, although the single-phase three-wire power can be obtained using the second output terminal V, the third output terminal W, and the fourth output terminal N, the second output terminal V and the fourth output terminal N are It can be used to obtain single-phase two-wire power, and the third output terminal W and the fourth output terminal N can be used to obtain single-phase two-wire power.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

1 Generator 2 U-phase coil (first phase coil)
3 V phase coil (second phase coil)
4 W phase coil (third phase coil)
5 Additional coil 21, 22 U-phase split coil 31, 32 V-phase split coil 41, 42 W-phase split coil 51, 52 Additional split coil N Fourth output terminal O Neutral point U First output terminal V Second output terminal W 3rd output terminal

Claims (1)

An even number of first phase split coils connected in series, one end connected to a neutral point and the other end connected to a first output terminal, with respect to the voltage generated by half of the first phase split coils A first phase coil configured such that the voltage generated by the remaining half of the first phase split coils has a phase difference of 60 °,
An even number of second phase split coils connected in series, one end connected to the neutral point and the other end connected to the second output terminal, with respect to the voltage generated by half of the second phase split coils The voltage generated in the remaining half of the second phase split coils has a phase difference of 60 °, and the second phase split coil has a vector sum of the voltages generated in the first phase split coil. A second phase coil configured such that the vector sum of the generated voltages is the same magnitude and has a phase difference of 120 °;
An even number of third phase split coils connected in series, one end connected to the neutral point and the other end connected to the third output terminal, with respect to the voltage generated by half of the third phase split coils And the voltage generated in the remaining half of the third phase split coils has a phase difference of 60 °, and is generated in the vector sum of the voltages generated in the first phase split coils and in the second phase split coils. A third phase coil configured such that the vector sum of the voltages generated in the third phase split coil has the same magnitude and a phase difference of 120 ° for each of the voltage vector sums;
An even number of additional divided coils connected in series, one end connected to the neutral point, the other end connected to the fourth output terminal, and the remaining half of the voltage generated by half of the additional divided coils The voltage generated in the additional divided coil has a phase difference of 60 °, and the vector sum of the voltage generated in the additional divided coil is 1 with respect to the vector sum of the voltage generated in the first phase divided coil. / 2 of 180 ° in size and one additional coil configured to have a phase difference seen including,
Three-phase four-wire power is obtained using the neutral point, the first output terminal, the second output terminal, and the third output terminal, and the second output terminal, the third output terminal, and the fourth output terminal. A generator that can produce single-phase three-wire power using an output terminal .

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