JP2010051067A - Power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equalize heating from each phase winding and enable simultaneous use of both three-phase power and single-phase, three-wire power just by adding one additional winding to three-phase windings. <P>SOLUTION: An intermediate tap is provided in a position 100/115 from the neutral point O in windings in two phases, for example, U-phase winding 1 and V-phase winding 2 of star-connected three-phase windings. An additional winding 4 that induces voltage identical in phase with W-phase winding 3 in the one remaining phase and equal in magnitude to voltage induced in the intermediate taps is provided. One end of the additional winding is connected to one of the two intermediate taps. Three-phase output is derived from the three-phase windings and single-phase, three-wire output is derived from a terminal T<SB>1</SB>provided in the other intermediated tap, a terminal T<SB>0</SB>provided at the neutral point O of the three-phase windings, and the other end T<SB>2</SB>of the additional winding 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable generator that can be used at a construction site or the like, and that can use both three-phase power and single-phase three-wire power at the same time.

  Large motors and pumps used at construction sites operate at three-phase 200V, and small electric tools and lighting 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 a single unit. Some suggestions have been made.

For example, in Patent Document 1, as shown in FIG. 4, 100/115 from the neutral point O of one phase of the three-phase windings 1, 2, 3, for example, the U-phase winding 1. provided with an intermediate tap T ₁ in position, to the neutral point O, the the U-phase winding 1 provided with the intermediate tap T ₁ antiphase, the induced voltage of the voltage equal in magnitude to that induced in the intermediate tap T ₁ By connecting the additional winding 4 to be shown, a generator is shown in which a three-phase voltage is output simultaneously to the terminals U, V, W and a single-phase three-wire voltage is output simultaneously to the terminals T ₀ , T ₁ , T _2. ing.

Furthermore, Patent Document 1, as shown in FIG. 5, the embedded phase windings slots, the U-phase winding 1, one half the number of turns from the neutral point O to the intermediate tap T ₁ U-phase additional winding 5, V-phase additional winding 6, W-phase additional winding 7 of the number of turns are embedded, and these additional windings are connected in series from neutral point O. U-phase additional winding 5 In an embodiment in which the V-phase additional winding 6 and the W-phase additional winding 7 are connected in the same phase as the V-phase winding 2 and the W-phase winding 3, respectively, in the opposite phase to the U-phase winding 1. It is shown.

  Further, in Patent Document 2, as shown in FIG. 6, taps at predetermined positions of two of the three-phase windings 1, 2, 3, for example, the U-phase winding 1 and the V-phase winding 2 are performed. A generator is shown in which one of the additional windings 8 and 9 having the same phase as the W-phase winding 3 is connected to the tap portion and the other terminal is a single-phase output terminal. Has been.

  Further, in Patent Document 2, as shown in FIG. 7, two of the three-phase windings 1, 2, 3 are tapped at predetermined positions of the U-phase winding 1, V-phase winding 2, for example. Example in which one of the additional windings 10 and 11 having the same phase as the other winding is connected to the tap portion, and the other terminal is used as a single-phase output terminal. Is also shown.

In this way, one unit can supply both three-phase 200V and single-phase 200V, 100V at the same time.
JP 2006-204005 A JP 2004-72985 A

   However, among the above-described conventional generators, the generators as shown in FIG. 4 have all the windings for single-phase three-wire output concentrated in the U-phase slots, so the slots in each phase are used in a balanced manner. In addition, when using three-phase and single-phase at the same time, the heat generated from the armature winding is concentrated only in the U-phase, and the overall output is limited by the temperature rise of the winding. There was a problem.

  In that respect, the generator as shown in FIG. 5 has the additional windings 5, 6, and 7 arranged in a balanced manner in each phase, but requires three additional windings, which increases the cost. There was a point.

  On the other hand, in the generator as shown in FIG. 6, the additional windings are all T-phase windings, and all the armature currents when the single-phase three-wire system is output are concentrated on the T-phase. The entire generator cannot be used in a balanced manner due to the problem of effective use of the area and heat generation due to the armature current. In addition, the number of additional windings is also a factor that increases the cost.

  Further, the generator as shown in FIG. 7 has a problem that although the concentration of the additional windings in the T phase can be avoided, the cost increase factor that the number of additional windings becomes two cannot be solved.

   In view of such a problem, the present invention only adds one additional winding to the three-phase winding, and evenly generates heat of each phase winding, while maintaining the three-phase power and the single-phase three-wire power. The purpose is to enable both at the same time.

   In order to solve the above-described problems, the generator of the present invention is provided with an intermediate tap in two-phase windings of the star-connected three-phase windings, and is induced in the intermediate tap in the same phase as the remaining one phase. An additional winding for inducing a voltage equal to the voltage to be generated is provided, one end of the additional winding is connected to one of the two intermediate taps, and a three-phase output is derived from the three-phase winding. In addition, a single-phase three-wire output is derived from the other of the two intermediate taps, the neutral point of the three-phase winding, and the other end of the additional winding. And

  In the generator of the present invention, an intermediate tap is provided in two-phase windings among three-phase windings connected in a star shape, and the same magnitude as the voltage induced in the intermediate tap is in phase with the remaining one phase. An additional winding for inducing the voltage is provided, and one end of the additional winding is connected to one of the two intermediate taps. As a result, only one additional winding is added to the three-phase winding, each phase is used in a balanced manner, the heat generation of each phase winding is made uniform, and the overall output is increased by the temperature rise of the specific winding. It is possible to use both three-phase power and single-phase three-wire power at the same time without being restricted.

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

FIG. 1 is an armature coil connection 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 standard voltage of the three-phase power supply in Japan is 200V or 400V, and the standard voltage of the single-phase power supply is 100V or 200V. Therefore, if the winding of the three-phase power supply is star-connected and the voltage is 200V, Between the neutral point and each phase is 200 V / √3≈115 V. Therefore, in order to obtain a single-phase 100 V, one phase of the U-phase winding 1, V-phase winding 2 and W-phase winding 3 connected in a star shape, for example, from the neutral point O of the U-phase winding 1 to 100. in / 115 positions, an intermediate tap _{T 1} provided therewith, from between the terminals _{T 0} provided on the neutral point O, to obtain an output of the single-phase 100 V.

On the other hand, an additional winding 4 that is insulated independently of the W-phase winding 3 is provided in the W-phase winding housing slot so that the induced voltage is 100 V, and one end of the additional winding 4 of the V-phase winding 2 is connect the neutral point O to the position of the tap of 100/115, the other end to the terminal _{T 2.}

FIG. 2 shows the relationship between the voltages induced in the windings in such a connected state as a vector diagram. That is, the synthesis of 100 V for the V phase and 100 V for the W phase is 100 V in the opposite direction of the U phase, and a single-phase three-wire power source is connected between the terminal T ₁ -terminal T ₀ -terminal T _2. As a result, a single-phase 100 V is output between the terminal T ₁ and the terminal T _{0 and} between the terminal T ₀ and the terminal T ₂ , and a single-phase 200 V is output between the terminal T ₁ and the terminal T ₂ . At the same time, three-phase 200V is output between the terminals U, V, and W.

  The single-phase current flows evenly through a part of the U-phase winding 1 and the V-phase winding 2 and the additional winding 4 provided in the W-phase winding housing slot, and the heat generated by these currents is also equal for each phase. Become. At the same time, a three-phase current flows through the U-phase winding 1, the V-phase winding 2, and the W-phase winding 3. At that time, a large current flows in the portion from the neutral point O to the tap position of the U-phase winding 1 and the V-phase winding 2 by superimposing the three-phase current and the single-phase current. In order to cope with such a large current, it is desirable to increase the thickness of the winding in that portion. By doing so, even if a large current flows by superimposing a three-phase current and a single-phase current on that portion, heat generation is suppressed, and the windings of the U, V, and W phase winding storage slots Storage density is also equal.

  FIG. 3 is an armature coil connection diagram of the second embodiment. In the embodiment of FIG. 1, the additional winding 4 is provided in the W-phase winding housing slot, and one end thereof is connected to the tap position of the V-phase winding 2. An additional winding 4 can also be provided. In this embodiment, the additional winding 4 is provided in the V-phase winding housing slot, and one end thereof is connected to the tap position of the W-phase winding 3. The tap position is set to a position 100/115 from the neutral point O of the W-phase winding 3 as in the embodiment of FIG.

It is an armature coil connection diagram of the 1st example. It is a vector diagram which shows the relationship of the voltage which generate | occur | produces in each winding. It is an armature coil connection diagram of the 2nd example. It is an armature coil connection diagram of the 1st conventional example. It is an armature coil connection diagram of the 2nd conventional example. It is an armature coil connection diagram of the 3rd conventional example. It is an armature coil connection diagram of the 4th conventional example.

Explanation of symbols

1 ... U phase winding 2 ... V phase winding 3 ... W phase winding 4 ... Additional winding

Claims (1)

  An intermediate tap is provided in the two-phase winding of the star-connected three-phase winding, and an additional winding for inducing a voltage having the same phase as the voltage induced in the intermediate tap in the same phase as the remaining one phase. Providing a wire, connecting one end of the additional winding to one of the two intermediate taps, deriving a three-phase output from the three-phase winding, and the other of the two intermediate taps; A generator, wherein a single-phase three-wire output is derived from a neutral point of the three-phase winding and the other end of the additional winding.

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