JPS6194567A - Phase converter - Google Patents

Abstract

PURPOSE:To enhance a conversion efficiency by winding the first third phase windings coupled in Y-connection on a stator core, using the split points of two phase windings as single-phase input terminals, and inserting a capacitor between two phase windings, thereby eliminating a stepup transformer. CONSTITUTION:The first - third phase windings 1U, 1V, 1W are coupled in Y-connection with the one ends as a neutral points 2 to wind on a stator core. The other ends of phase windings 1U, 1V, 1W are led as 3-phase output terminals U, V, W, and the split points of the two phase windings 1U, 1W of the first - third phase windings 1U, 1V, 1W are led as single-phase input terminals A, B. A capacitor 3 is inserted between the windings 1V and 1W, and the windings groups 1Ub, 1Vb, 1Wb of the 3-phase output terminal side are so wound as to become reverse polarity to the neutral point side.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to phase conversion for converting single-phase power into three-phase power, and specifically enables phase conversion by boosting the voltage without requiring a step-up transformer. Regarding before phase conversion.

[Technical background of the invention and its problems]

Single-phase induction electric pumps are used for submersible pumps used in civil engineering work, etc.
There are various types such as 3-phase induction motor type and 3-phase induction motor type.

Normally, three-phase induction motors are often used as motors, and three-phase induction motors are the mainstream for general-purpose, large-capacity motors.

To drive a 3-phase induction electric N-type submersible pump when there is no 3-phase power supply, you can use a dedicated engine 3-phase power generator, or convert the single-phase power supply to a 3-phase power supply using a phase conversion line. In addition, since a single-phase power supply generally has a voltage of 100V and a three-phase power supply has a voltage of 200V, the above-mentioned phase converters equipped with a phase conversion dawn function and a step-up front are in practical use. There is.

Figure 4 shows a conventional example of this type of phase conversion bolt, in which single-phase type 8!11 single-phase power is stepped up by a step-up transformer 12, and the boosted secondary output is converted into a three-phase induction motor. 1 13
By connecting one of these two terminals and the other terminal with a capacitor 14, the terminals U1 and V
3-phase power is obtained by phase conversion from Wl and Wl.

However, in the phase converter configured as described above, the ascending transformer 1
2, there is a problem in that power loss occurs due to iron loss accompanying the conversion, and the overall size of the device increases, resulting in poor portability.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its object is to provide a step-up device that does not require a step-up transformer, has good conversion efficiency, and is compact.

An object of the present invention is to provide a phase converter capable of phase conversion.

[Summary of the invention]

In order to achieve such an object, in the present invention, a rotor is rotatably arranged on a stator, and a first... Second. The third phase winding is Y with one end as the neutral point.
The wires are connected and wound around the stator core of the stator, and the other ends of each of the above are led out as three-phase output terminals. Second. The dividing point of two phase windings among the third phase windings is derived as a single-phase input terminal. Second. 2 of the 3rd phase windings
A capacitor is inserted between the two phase windings, and the winding groups on the neutral point side are wound so that they have the same magnetic pole, and the winding groups on the three-phase output terminal side are connected to the neutral point side. is characterized in that it is wound so that the magnetic poles are opposite to each other.

[Embodiments of the invention]

The phase converter according to the present invention will be explained below according to an embodiment shown in FIG.

In Fig. 1, 1U is the U-phase winding, and this U-phase winding 1!
1tJ is the 1st. The second winding group 1Ua, IUI). Similarly, the V-phase winding 1■, the W-phase winding, and the wire 1W are the 1st. Second winding group iva.

The tail consists of 1Vb, 1Wa, and IWb. One ends of each of windings miu, iv, and 1w are connected together to form a neutral point 2, and the other ends of each are terminals U, V, and W for three-phase power output of this phase converter. Follow, wtslv
, 1v, 1w is 3 phase 11! A balanced three-phase winding is configured as a Y-connected stator winding of the motor.

Furthermore, terminals A and B for single-phase power input are led out from the dividing point of each winding group of the U-phase winding 1tJ and the W-phase winding 1W. A capacitor 3 is connected to the dividing point of each winding group of the V-phase winding IV and the W-phase winding 1W.

Next, the detailed configuration of, for example, the U-phase winding 1U as one phase in FIG. 1 will be explained with reference to FIG. 2.

In FIG. 2, the first . Second winding group 1 (
Ja, IUb are further divided, that is, the first winding group I
Ua is composed of winding groups 1Ual, IU, and a2, and the second winding group 1Ub is composed of winding groups 1Ub1゜IUb2, which are wound around a stator core (not shown),
The magnetic poles S and N are arranged with the rotor 4 so that they are adjacent to each other at 90'. Figure 3 shows the winding arrangement in Figure 2 with 4 poles,
FIG. 4 is a developed diagram of windings when applied to an example in which the number of stator slots is 24.

That is, as an example, the conductor of the U-phase winding 1U is received from the output terminal U into the slot 1, passes between the slots, is stored in the slot 6, and then passes between the slots and reaches the slot 13. The conductor of the U-phase winding 1U housed in this slot 13 passes between the slots and into the slot 1.
After being accommodated in the slot 8, it is led out as the input terminal A, passing between the slots and being accommodated in the slot 12, and then passing between the slots and being accommodated in the slot 7. Thus, the conductor of the U-phase winding 1U housed in the slot 7 passes between the slots and is housed in the slot 24, and then passes between the slots and is housed in the slot 19 to reach the neutral point 2.

Here, slot 1. ~． Winding 6 is the first winding group 1L
The winding group 1LIa1 of Ja is configured, and the slots 7°~, 1
The winding No. 2 constitutes the winding group 1U of the second winding group IUb (R), and the windings of slots 13. to .18 form the winding group 1U of the second winding group IUb.
constitute winding group IUa2 of slot 19.a. ~． 24
The windings constitute a winding group 1Ub2 of the second winding group 1Ub. Note that Vc indicates a dividing point of each winding group of the V-phase winding 1v, and one end of the capacitor 3 is connected to this dividing point Vc.

Next, the operation of this embodiment configured as described above will be explained. That is, when a single-phase voltage e1 is applied to the terminals A and B in FIG. 1 from a single-phase power supply (not shown), current flows through the second winding group '+ubi, iub2 in FIG. 2 and they are excited. , no current flows through the first winding group 1 Ual, I Ua2 and is not excited, and the second winding group 1 Ubl, I
The first winding group I Ual by each magnetic pole S by Ub2
, 1 A magnetic pole N is generated in each Ua2.

Second winding group 11Jb, IVb, 1Wb.

A rotor 4 is rotated by a three-phase induction motor including a capacitor 3, and a first winding group ILJa, IVa.

A voltage proportional to the number of turns is induced in 1Wa according to the law of electromagnetic induction. That is, if the number of turns of the first winding group and the second winding group is the same, the terminal U-V.

v-w and w-u each have a voltage 2・el that is twice the input voltage.
occurs, and a three-phase AC voltage is generated at the output terminals U, V, and W.

A 4-pole 0.75 kW 3-phase induction motor is configured with divided windings as in this example, and a single-phase AC voltage of 100 V (60 Hz>) is applied to input terminals A and B. In this case, output terminals U, The relationship between the induced voltage between V and W and the capacitor 3 was actually measured through a test.The measured values are shown in the table below.

According to the table above, in the case of a 200V three-phase AC output, the optimum capacitance of the capacitor 3 is 40 μF.

In the above, it is assumed that the number of turns of the first winding group and the second winding group is the same, but when the input single-phase AC voltage e1 is 1oov,
If the output 3-phase AC voltage e2 requires 220V, the first
The ratio N2/Nl of the number of turns N1 of the second winding group to the number of turns N2 of the second winding group may be set to 1.1. That is, the induced voltage is (N1 +N2)/N1 according to the law of electric m induction.
= e2 /e1, 1 +N2 /N1 =22
By 0/100, N2 /N1 =1.2.

Similarly, when the input single-phase AC voltage e1 is 110■ and the output three-phase AC voltage e2, N2 /N1 = 200, -' 11
N2/NI may be set to 0.82 by 0-1.

As described above, according to this embodiment, each of the three-phase stator windings 1u, iv, and iw has a divided configuration, and the input terminals A, .
By applying a single-phase AC voltage to B, the output terminals U, V,
From W, it is possible to generate a three-phase AC voltage according to the turns ratio of the winding group having the above-mentioned split configuration.

Therefore, it is possible to obtain three-phase power from single-phase power without requiring a conventional step-up transformer, and the conversion efficiency is high. Since the step-up transformer becomes undesirable, it can be made lighter and more portable, resulting in a practical phase converter with low product price and transportation costs, and a space-saving installation space.

The present invention is not limited to the above-mentioned embodiment, and may be a multi-pole winding other than four poles, and the capacitor 3 is connected to the output terminal U.
, V, and W may be inserted between two terminals.

In addition, various modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, the rotor is rotatably arranged on the stator, and the first and second rotors each include a plurality of winding groups. Second. The third phase winding is Y-connected with one end as a neutral point and wound around the stator core of the stator, and the other ends of each are led out as three-phase output terminals. Second. The dividing point of two phase windings among the third phase windings is derived as a single-phase input terminal. Second. A capacitor is inserted between two phase windings of the third phase winding, and each winding group on the neutral point side is wound to have the same 11 poles. Since the winding group is wound in a magnetic pattern opposite to the neutral point side, a step-up transformer is not required, the conversion efficiency is good, and the size can be reduced. A phase converter capable of phase conversion can be provided.

[Brief explanation of the drawing]

Fig. 1 is a winding connection diagram showing one embodiment of the phase converter according to the present invention, Fig. 2 is a detailed wiring diagram of the U phase of the same embodiment, and Fig. 3 is a development of the winding in the same embodiment. 4 are block diagrams showing the structure of a conventional phase converter. I LJ, I V, 1W/U, V, W phase winding, 2...
Neutral point, 3... Capacitor, 4... Rotor, A, B
...Single-phase input terminal, U, V, W...3-phase output terminal,
1tJa. I Va, 1Wa--first winding group, iub,"
+vb. 1Wb...Second winding group. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (3)

[Claims] (1) The rotor is rotatably arranged on the stator, and the first, second, and third phase windings, each consisting of a plurality of winding groups, are Y-connected with one end as a neutral point and fixed as above. Wrap it around the stator core of the child, and lead out the other ends of each of the above as three-phase output terminals,
The dividing point of two of the first, second, and third phase windings is derived as a single-phase input terminal, and two of the first, second, and third phase windings are derived as a single-phase input terminal. A capacitor is inserted between the two phase windings, and the winding groups on the neutral point side are wound so that they have the same magnetic pole, and the winding groups on the three-phase output terminal side are connected to the neutral point side. A phase converter characterized by being configured by winding the magnetic poles so that they have opposite magnetic poles. (2) The plurality of winding groups are first and second winding groups, and the number of turns of the first winding group is N1, and the number of turns of the second winding group is N2. The phase converter according to claim (1), characterized in that the ratio of the number of turns is N2/N1≧1. (3) The plurality of winding groups are first and second winding groups, where the number of turns of the first winding group is N1 and the number of turns of the second winding group is N2. A phase converter according to claim 1, characterized in that the ratio of the number of turns is N2/N1<1.