JP4780966B2 - Generator - Google Patents

Description

  The present invention relates to a portable generator used at a construction site or the like, and relates to a generator capable of simultaneously using both three-phase power and single-phase three-wire power.

  Large motors and pumps used at construction sites operate at three-phase 200V, and small electric tools and lamps operate at single-phase 200V or 100V. Therefore, in recent years, portable generators used at construction sites are required to be able to supply both three-phase 200V and single-phase 200V, 100V with one unit. Some suggestions have been made.

For example, in the generator shown in Patent Document 1, as shown in FIG. 3, at least one phase of the three-phase windings of the generator is divided into two (in FIG. In the case of obtaining three-phase power, as shown in FIG. 3 (a), the two-phase windings are connected in series to form a three-phase star as a whole. Connect to obtain three-phase output from terminals U, V, and W. On the other hand, in order to obtain single-phase three-wire power, one winding 3b of W-phase windings 3a and 3b divided into two is connected to a neutral point O in opposite phase as shown in FIG. A single-phase three-wire output is obtained between the terminals T ₀ , T ₁ and T ₂ . That is, as shown in the vector diagram of FIG. 3 (c), a single phase of 100V between the terminals T ₀ and T _{1 and} between the terminals T ₀ and T ₂ and 200 V between the terminals T ₁ and T _{2 in} opposite phases. Voltage is output.

  According to this generator, one generator can use both three-phase power and single-phase three-wire power.

Further, in the generator shown in Patent Document 2, as shown in FIG. 4, each of the three-phase windings is composed of two windings, and only one of them, for example, the V-phase, is wound on one side. The wire is composed of two windings 2B and 2C. When three-phase power is obtained, as shown in FIG. 4 (a), the windings of the respective phases are connected in parallel, connected in a three-phase star shape, and the terminals U, V, W are connected to the three-phase power. Get the output. Further, when both the three-phase power and the single-phase three-wire power are used at the same time, the connections of the V-phase windings 2B and 2C are switched as shown in FIG. As a result, a three-phase output is obtained from the terminals U, V, and W, and a single-phase three-wire output is obtained between the terminals T ₀ , T ₁ , and T ₂ . That is, as shown in the vector diagram of FIG. 4C, a _single phase of 100 V between the terminals T ₀ and T _{1 and} between the terminals T ₀ and T ₂ and 200 V between the terminals T ₁ and T _{2 in} opposite phases. Voltage is output.

According to this generator, one generator can use both three-phase power and single-phase three-wire power at the same time.
JP-A-63-87157 JP 2002-335696 A

  However, among the conventional generators described above, the generator disclosed in Patent Document 1 has a problem in that three-phase power and single-phase three-wire output cannot be obtained simultaneously. Moreover, in order to change from the state used in the three-phase output to the single-phase three-wire output, it is necessary to switch the connection of the winding 3b, which is troublesome and may cause a burnout accident of the generator due to an erroneous operation. There was a problem.

On the other hand, if the generator shown in Patent Document 2 is connected as shown in FIG. 4 (b), both three-phase power and single-phase three-wire power can be used simultaneously without switching the connection. However, there is a problem that the neutral point cannot be shared by the three-phase and single-phase three-wires. That is, between the neutral line terminal T ₀ neutral point O and single-phase three-wire output of the three-phase, since the winding 2B, 2C are connected, both are inevitably separated. Especially in the case of single-phase three-wire, but often the neutral line is grounded and grounding the terminal T ₀ in FIG. 4 (b), the neutral point O of the three-phase is become impossible ground. If both are mistakenly grounded, there is a risk that the windings 2B and 2C are short-circuited and the generator windings are burned out.

  In view of such a problem, the present invention can use both three-phase power and single-phase three-wire power at the same time without switching the connection with a simple configuration, and can also use three-phase and single-phase three-wire. The purpose is to allow neutral points to be shared.

In order to solve the above-mentioned problem, the generator according to claim 1 is a generator that can use three-phase power and single-phase three-wire power at the same time . An intermediate tap is provided in the winding, and is equal in phase opposite to the voltage induced in the intermediate tap embedded in the winding housing slot of the winding provided with the intermediate tap at the neutral point of the three-phase winding. By connecting an additional winding that induces a voltage of magnitude , and sharing the three-phase neutral point and the single-phase three-wire neutral point, both three-phase power and single-phase three-wire power It is possible to be grounded at the same time .

The generator according to claim 2 is a generator capable of simultaneously using three-phase power and single-phase three-wire power, and an intermediate tap is provided on one phase of the star-connected three-phase windings. And at a neutral point of the three-phase winding , embedded in a winding housing slot of the winding provided with the intermediate tap, is half the magnitude opposite to the voltage induced in the intermediate tap. Other than the winding provided with the intermediate tap embedded in the winding storage slot of the two-phase winding other than the winding provided with the intermediate tap , respectively in the induced voltage of the secondary winding phase and in phase, the second and third additional winding connected in series to induce the first induced voltage equal to the magnitude of the voltage of the additional winding, the three By sharing the neutral point of the phase and the neutral point of the single-phase three-wire, both three-phase power and single-phase three-wire power can be used simultaneously. It characterized in that it made it possible to land.

The generator of the present invention has the following effects.
That is, the generator according to claim 1 is provided with an intermediate tap in one-phase winding of the three-phase winding, and a voltage induced in the intermediate tap at a neutral point of the three-phase winding. Since an additional winding that induces voltages of equal magnitude in opposite phases is connected, it is possible to use both three-phase power and single-phase three-wire power at the same time without switching the connection with a simple configuration. The neutral point can be shared between the phase and the single-phase three-wire.

  The generator according to claim 2 is a first addition that induces a voltage having a half magnitude in a phase opposite to a voltage induced in the intermediate tap at a neutral point of the three-phase winding. A second voltage that induces a voltage having the same phase as the induced voltage of the two additional windings other than the winding provided with the intermediate tap and the same magnitude as the induced voltage of the first additional winding. And the third additional winding is connected in series, so that each additional winding can be evenly arranged in the winding storage slot of each phase, and the physique of the generator is mischievous for storing the additional winding. It can be prevented from becoming large.

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

FIG. 1 is an armature coil connection diagram and a vector diagram of the first embodiment. In FIG. 1, 1 is a U-phase winding, 2 is a V-phase winding, 3 is a W-phase winding, and 4 is an additional winding. The three-phase standard voltage in Japan is 200V or 400V, and the single-phase standard voltage is 100V or 200V. When the windings of the three-phase power supply are star-connected and the voltage is 200V, the neutral point and each phase are 200V / √3 = 115V. Therefore, in order to obtain a single-phase 100V, from the neutral point O of the U-phase winding 1, the V-phase winding 2, and the W-phase winding 3 that are star-connected, for example, the U-phase winding 1 intermediate tap _{T 1} is provided at a position of 100/115, and from there to extract the output of the single-phase 100 V.

Also, the embedded U-phase winding 1 provided with the intermediate tap T ₁ slot, the additional winding 4 of the same number of turns as the number of turns of the U-phase winding 1 from the neutral point O to the intermediate tap T ₁ embedded, its The additional winding 4 is connected to the neutral point O in a reverse phase relationship with the U-phase winding 1. Accordingly, an antiphase voltage is induced at the terminal T ₂ at the other end of the additional winding 4 with a voltage 100 V having a magnitude equal to the voltage induced at the intermediate tap T ₁ .

As a result, as shown in the vector diagram of FIG. 1B, 100V between the intermediate tap T ₁ and the terminal T ₀ , 100V in reverse phase between the terminals T ₀ and T ₂ , and the intermediate tap T ₁ and the terminal T _2. In between, 200V single-phase three-wire power is output. At the same time, 200 V of three-phase power is output to the terminals U, V, and W.

FIG. 2 is an armature coil connection diagram and a vector diagram of the second embodiment. In FIG. 2, reference numerals 1, 2, and 3 correspond to those in FIG. 1, 5 is a U-phase additional winding, 6 is a V-phase additional winding, and 7 is a W-phase additional winding. An intermediate tap T ₁ is provided at a position 100/115 from the neutral point O of the U-phase winding 1, as in FIG.

Also, the embedded phase winding slot, U-phase addition of one-half the number of turns of turns from the neutral point O of the U-phase winding 1 to the intermediate tap T ₁ winding 5, V-phase additional winding 6, W phase additional winding 7 is embedded, and these additional windings are connected in series from neutral point O. The U-phase additional winding 5 is connected to the neutral point O in the opposite phase to the U-phase winding 1, and the V-phase additional winding 6 and the W-phase additional winding 7 are respectively connected to the V-phase winding. 2 and W-phase winding 3 are connected in the same phase.

U-phase additional winding 5, V-phase additional winding 6, W-phase additional winding 7, since it is 1 turns half the number of turns from the neutral point O of the U-phase winding 1 to the intermediate tap T ₁ , each additional winding, voltage 50V of 1 the size of half of the voltage of 100V induced in the intermediate taps T ₁ is induced. As a result, as shown in the vector diagram in FIG. 2 (b), the terminal T ₂ of the other end of the W-phase additional winding 7, the reverse voltage 100V voltage equal in magnitude to that induced in the intermediate tap T ₁ A phase voltage is induced. At the same time, 200 V of three-phase power is output to the terminals U, V, and W.

  In this way, the U-phase additional winding 5, the V-phase additional winding 6, and the W-phase additional winding 7 can be evenly arranged in the winding storage slots of the respective phases, and the useless slot area is eliminated. Thus, the size of the generator can be prevented from becoming unnecessarily large for storing additional windings.

It is an armature coil connection diagram of the 1st example. It is an armature coil connection diagram of the 2nd example. It is the armature coil connection diagram and vector diagram of a 1st prior art example. It is an armature coil connection diagram and a vector diagram of the 2nd conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... U phase winding 2 ... V phase winding 3 ... W phase winding 4 ... Additional winding 5 ... U phase additional winding 6 ... V phase additional winding 7 ... W phase additional winding

Claims (2)

A generator that can use three-phase power and single-phase three-wire power simultaneously,
An intermediate tap is provided on one phase of the three-phase windings connected in a star shape, and is embedded in a winding receiving slot of the winding provided with the intermediate tap at the neutral point of the three-phase winding . , Connecting an additional winding that induces a voltage of the same magnitude in reverse phase as the voltage induced in the intermediate tap, and sharing the neutral point of the three-phase and the neutral point of the single-phase three-wire Thus, it is possible to ground both the three-phase power and the single-phase three-wire power at the same time . A generator that can use three-phase power and single-phase three-wire power simultaneously,
An intermediate tap is provided on one phase of the three-phase windings connected in a star shape, and is embedded in a winding receiving slot of the winding provided with the intermediate tap at the neutral point of the three-phase winding . A first additional winding for inducing a voltage of a half magnitude in phase opposite to the voltage induced in the intermediate tap, and two-phase windings other than the winding provided with the intermediate tap , respectively A voltage having the same phase as the induced voltage of the two-phase windings other than the winding provided with the intermediate tap is embedded in the winding accommodating slot of the first additional winding. By connecting the second and third additional windings in series and sharing the three-phase neutral point and the single-phase three-wire neutral point, three-phase power and single-phase three-wire power A generator characterized in that both can be grounded simultaneously .

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