JPH0223064A - Ac 3-phase/2-phase converter - Google Patents

Abstract

PURPOSE:To eliminate unbalance due to difference among characteristics of each core by winding and disposing 3-phase and 2-phase windings at predetermined numbers of turns on the same magnetic core. CONSTITUTION:3-phase first windings 3, 3-phase second windings 7 and 3-phase third windings 8 are wound in a state that they are respectively shifted at 120 deg. on a magnetic core 10. Further, coincident 2-phase first windings 5 and 2-phase second windings 6 are wound in a state that they are respectively shifted by 90 deg. on the core 10. The windings 3, 7-8 and 5-6 are secured in slots 11 of the core 10. Thus, when input voltages E1-E3 are respectively input to the windings 3, 7-8, predetermined 2-phase output voltages are obtained from the windings 5-6.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to an AC three-phase to two-phase converter, and in particular, a three-phase winding and a two-phase winding are arranged on the same magnetic core. This invention relates to a novel improvement for obtaining a compact and highly reliable structure that does not require unbalance adjustment due to differences in magnetic cores.

b. Prior Art Various configurations have been proposed for this type of AC three-phase to two-phase converter that has been used in the past, but a typical configuration will be described below.

Although the literature name indicating the conventional structure is not shown here, the commonly used structure shown in FIG. 3 can be disclosed.

That is, what is indicated by the reference numeral 1 in FIG. 3 is a first iron core made of a core, and a second iron core 2 having the same characteristics as this first iron core 1 is arranged in parallel.

On the input side IAt of the first iron core 1, a three-phase first winding 3 having first and second terminals A and B is wound, and on the input side 2A of the second iron core 20, a third terminal is wound. A six-phase second winding 4 having C is wound.

One end 4a of the second three-phase winding 4 is connected to an intermediate tag 6aζ of the first three-phase winding 3, and is connected to the first three-phase winding 3 and the second three-phase winding 3. 4 is configured by Scott connection.

Further, on the output side 1B of the first iron core 1, a two-phase first
In addition to the winding 5 being wound around the output side 2B of the second iron core 2, a two-phase second winding 6 is also wound around the output side 2B of the second iron core 2.

The conventional AC three-phase to two-phase converter is constructed as described above, and its operation ζ will be explained below.

First, in the state l shown in FIG.
1, input voltage between terminals B and 0 E2. Between terminals A and 0 (
When this input voltage E3 is inputted as shown below, the following is output from the two-phase first winding 5 and the two-phase second winding 6.

Furthermore, when the following input voltages E'1 to B+3 are input to each of the terminals A-C, from each two-phase first winding 5 and two-phase second winding 6, the following two-phase Voltage E. 1 and E
. You can get 2.

C1 Problems to be Solved by the Invention Since the conventional AC three-phase to two-phase converter was configured as described above, it had the following problems.

In other words, using a pair of magnetic cores with the same characteristics and winding them with different winding ratios is the basic condition for obtaining a precise 6-phase to 2-phase converter. It is strictly impossible to obtain a pair of transformers,
Therefore, it was necessary to adjust the unbalance by connecting a load resistor to the tap on the winding, making it difficult to obtain good conversion characteristics.

Furthermore, since a pair of transformers is used, the shape becomes dog-like, making it difficult to obtain a compact configuration.

The present invention has been made to solve the above-mentioned problems, and consists of arranging three soma windings and a two-way winding on the same magnetic core, and reducing the unbalance caused by the difference in the magnetic core. The object of the present invention is to provide a 6-phase AC to 2-phase converter that does not require balance adjustment and has a compact and highly reliable structure.

Means for Solving the Problem The AC 5-phase to 2-phase converter according to the present invention has one
A first winding edge for 6 phases, a second winding for 6 phases, and a third winding for 3 phases, which are provided with a phase shift of 20 degrees, and on the magnetic iron core (which are provided with a predetermined angle phase shift from each other). This configuration includes a two-phase first winding and a two-phase second winding.

00 Effect In the AC 5-phase to 2-phase converter according to the present invention, three three-phase windings and two two-way windings are arranged on the same magnetic core. Input voltage E1 to E3 to the 6-phase winding
When inputting , the following two-phase output voltage is obtained from each binary summation winding.

However, β is the mechanical angle phase of the three-soma winding and the two-sum winding, and can be fixed at any angular position.

f, Example below, together with drawings, misfire E! A preferred embodiment of the AC three-phase to two-phase converter based on A+ will be described in detail.

It should be noted that the same or equivalent parts as in the conventional example will be described with the same reference numerals.

Figures 1 and 2 are for showing an AC three-phase to two-phase converter according to the present invention. Figure 1 is a winding configuration diagram showing the overall configuration, and Figure 2 is a winding configuration diagram. .

What is indicated by the reference numeral 10 in the figure is a magnetic core, and on this magnetic core 10, a first winding 3 for three phases, a second winding 7 for three phases, and a second winding 7 for three phases are arranged with a phase shift of 1200. 3rd use
The windings 8 are respectively wound.

Further, a pair of two-phase first winding 5 and a two-phase second winding 6 are respectively wound on the magnetic iron core 10 with a phase shift of 90° from each other.

The center of each of the two wafer volumes 5 and 6 and the 1st volume # for the 3-phase
! The mechanical angle phase β with respect to the center of 3 is
It can be fixed at any position depending on the installation position.

Furthermore, is the configuration shown in FIG. 2 different from each three-phase winding shown in FIG. 1? tM3, 7, and 8 and each of the two summation windings 5 and 6 are actually wound around each slot 11 formed in the same magnetic core 10, and the above-mentioned three summation windings 3, 7, and 8 and 2 each
Japanese medicine roll? IM5 and 6 are each slot 1 of the same core 10
It is fixed within 1.

The AC three-phase to two-phase converter according to the present invention is configured as described above, and its operation will be explained below.

First, in the state shown in Fig. 1, an input voltage E1 is applied between each terminal A and 8 of the first winding 3 for 6 phases, an input voltage E2 is applied between each terminal B and 0 of the second winding 7 for 3 phases, and When input voltage E3 is input between each terminal A and 0 of the third winding 8 as shown below, from the first two-phase winding 5 and the second two-phase winding 6, β is Mechanical angular phase of the winding and dual winding.

is output.

Furthermore, the following input voltages E, ~E3 are applied to each of the three-phase windings -3.
, 7 and 8, the following two-phase voltage E is obtained from each two-phase winding 5 and 6. , and Eo2 can be obtained.

g0 Effects of the Invention Since the AC three-phase to two-phase converter according to the present invention is configured as described above, the following effects can be obtained.

In other words, since the triple-sum winding and the double-sum winding are wound at a constant value on the same magnetic core, it is possible to reduce , there is no imbalance due to differences in the characteristics of each iron core (and no adjustment is required), and phase conversion can be performed in a perfectly balanced state.

Further, the phase between the three-phase winding and the two-phase winding can be arbitrarily fixed at any winding fixing position of the five-phase winding and the two-phase winding.

Furthermore, since the triple-combinant winding and the double-combinant winding are arranged on the same magnetic core, the transformer is more compact than the conventional single-pair transformer structure, contributing to the miniaturization of electronic devices. be able to.

[Brief explanation of the drawing]

Figures 1 and 2 are for showing an AC three-phase to two-phase converter according to the present invention. Figure 1 is a winding configuration diagram showing the overall configuration, Figure 2 is a winding structure diagram, Figure 3 shows the conventional AC three-phase
FIG. 2 is a winding configuration diagram showing a two-phase converter. 6 is a 3-phase first winding, 7 is a 5-phase second winding, 8 is a 6-phase sixth winding, 5 is a 2-phase first winding, 6 is a 2-phase second winding,
10 is a magnetic iron core. Patent applicant Tamagawa Seiki Co., Ltd. has 3 bags, 1st case for 1st or 2nd phase, 2nd wire for 2nd phase, 2nd wire for 2nd phase, 3rd grade ground, 2nd winding, 1st wire for 3rd phase, 1st wire for 1st or 2nd phase. No. 2 iron core Figure 2 Figure 3

Claims (1)

[Claims] A 3-phase first winding (3), a 3-phase second winding (7), and 3 are provided on the magnetic core (10) with a phase shift of 120°.
A third phase winding (8), a two-phase first winding (5) and a two-phase second winding (6) provided on the magnetic core (10) with a predetermined angle phase shift from each other. and each of the three-phase windings (
3, 7, and 8), an AC three-phase to two-phase converter is characterized in that a two-phase output is obtained from each of the two-phase windings (5, 6).