CN201112118Y - Scott transformer - Google Patents

Abstract

The utility model discloses a Scott transformer, which comprises two transformers, wherein the primary coil of one transformer is connected with the middle tap of the primary coil of the other transformer, and is characterized in that a plurality of groups of windings forming the two transformers are wound on the same group of magnetic materials; the magnetic material is composed of a plurality of magnetic cores; the plurality of magnetic cores form a plurality of magnetic circuits. Adopt the utility model discloses, with two current independent magnetic cores, become a plurality of little magnetic cores, reduced the volume of transformer, alleviateed weight to save the material, reduced manufacturing cost. And because the leakage inductance of the transformer of one magnetic system is smaller than that of the transformers of two independent magnetic systems, the loss of the Scott transformer is reduced, and the efficiency is improved by nearly 20 percent.

Description

A Scott Transformer

technical field

The utility model relates to the field of transformers, in particular to a Scott transformer.

Background technique

Scott transformers are usually composed of two single-phase transformers. Connect the end of one transformer high-voltage winding to the center of another high-voltage winding to form a "T"-shaped three-phase high-voltage winding. Each low voltage winding is a simple single phase winding with no electrical connection between them. They have the same voltage and current as normal single-phase transformers. But the winding and current of each high-voltage group are different from ordinary single-phase transformers.

Since the existing Scott transformer adopts two independent magnetic cores, which are very large in volume and weight, and the leakage inductance of the transformer of the two independent magnetic systems is relatively large, the loss of the existing Scott transformer is relatively large.

Utility model content

The technical problem to be solved by the utility model is to provide a Scott transformer. This kind of transformer is small in size, light in weight, low in cost, and the loss of leakage inductance is small.

In order to solve the above-mentioned technical problems, the embodiment of the utility model provides a Scott transformer, including: two transformers, the primary coil of one transformer is connected with the center tap of the primary coil of the other transformer, forming the two transformers Multiple groups of windings are wound on the same group of magnetic materials; the group of magnetic materials is composed of a plurality of magnetic cores; and the plurality of magnetic cores form a plurality of magnetic circuits.

Beneficial effects of the embodiment of the utility model: Since the existing two independent magnetic cores are changed into multiple small magnetic cores, the volume and weight of the transformer are reduced, thereby saving materials and reducing production costs. Also, because the leakage inductance of a magnetic system transformer is smaller than that of two independent magnetic system transformers, the loss of the Scott transformer is reduced, and the efficiency is increased by nearly 20%.

Description of drawings

Fig. 1 is the circuit schematic diagram of the Scott transformer of the utility model;

Fig. 2 is the structural representation of an embodiment of the Scott transformer of the present utility model;

Fig. 3 is a structural schematic diagram of another embodiment of the Scott transformer of the present invention.

Detailed ways

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. In the referenced drawings, the same reference numerals are used for the same or similar components in different drawings.

Referring to Fig. 1, it is the schematic circuit diagram of the Scott transformer of the present utility model. The Scott transformer has two transformers, one is the α-seat transformer and the other is the β-seat transformer; the primary coil of the α-seat transformer is connected to the middle tap 1 of the primary coil of the 3-seat transformer, and the secondary coil of the α-seat transformer is connected to the 3 The secondary coil of the β-seat transformer is connected in series, and the secondary coil of the β-seat transformer is connected in parallel with a phase-shifting capacitor. In this way, the Scott transformer can convert three-phase electricity into single-phase electricity.

Referring to FIG. 2 , it is a schematic structural diagram of an embodiment of the Scott transformer of the present invention. As shown in Figure 2, the Scott transformer of the present embodiment comprises 5 magnetic circuits (magnetic circuit 1, magnetic circuit 2, magnetic circuit 3, magnetic circuit 4 and magnetic circuit 5) that 5 magnetic cores form; Three sets of windings L1, L2 and L2' on the five magnetic circuits, wherein the winding L1 is wound continuously or interspersedly on the magnetic circuit 1, the magnetic circuit 2, the magnetic circuit 3 and the magnetic circuit 4 of the five magnetic circuits And on the magnetic circuit 5, each turn of the winding L1 is a single magnetic circuit winding; the winding L2 is wound on the magnetic circuit 1 and the magnetic circuit 2 at the same time, and each turn of the winding L2 is a double magnetic circuit winding; the winding L2' is simultaneously wound Made on the magnetic circuit 4 and the magnetic circuit 5, each turn of the winding L2' is a double magnetic circuit winding. The windings L2' and L2 are connected in series, and the induced magnetic flux of the winding L2' is opposite to the induced magnetic flux generated by the winding L1 on the winding L2. Thus, winding L2' forms a compensating winding between L1 and L2. In a specific implementation, the winding L2' can also be connected in series with the winding L1, and when connected in series with L1, the induced magnetic flux of the winding L2' also needs to be opposite to the induced magnetic flux generated by the winding L1 on the winding L2. The windings L1, L2 and L2' may include a primary winding and at least one secondary winding; the windings L1, L2 and L2' may be coil windings, planar conductor windings or equivalent windings made of printed circuit boards, or combination of the windings. Wherein, the coil winding is wound on the magnetic core by wires in the direction perpendicular to the magnetic circuit. The wires can be single or multiple wires are wound side by side. Copper foil, aluminum foil and other conductive foil strips are wound; the planar conductor winding is folded from a thin conductor material; when the equivalent winding made of a printed circuit board is used, the printed circuit board used to make the equivalent winding Can be one or more layers. In addition, the magnetic core in this embodiment may be a U-shaped magnetic core, a CD core, a circular core post core or a magnetic core with a central post.

In this embodiment, since the winding L1 has windings on each magnetic circuit of the multi-magnetic circuit transformer, and the winding L2 only has windings on the magnetic circuit 1 and the magnetic circuit 2, mutual inductance will be generated between the windings L1 and L2, Therefore, in this embodiment, the compensation winding L2' is connected in series with the winding L2 to offset the mutual inductance generated by L1 on L2, and ultimately there is no mutual inductance between the windings after the windings L1 and L2 are connected in series with L2'. Then L1 can independently form a transformer, and L2 together with L2' can independently form a transformer. The final formed two transformers are connected according to the circuit shown in Figure 1 to form a complete Scott transformer.

Referring to FIG. 3 , it is a schematic structural diagram of another embodiment of the Scott transformer of the present invention. As shown in Figure 3, the Scott transformer of the present embodiment comprises 5 magnetic circuits (magnetic circuit 1, magnetic circuit 2, magnetic circuit 3, magnetic circuit 4 and magnetic circuit 5) that 5 magnetic cores form; Three sets of windings L1, L2 and L2' on the five magnetic circuits, wherein the winding L1 is wound successively or interspersedly on the magnetic circuit 1, the magnetic circuit 2, the magnetic circuit 3 and the magnetic circuit 4 of the five magnetic circuits And on the magnetic circuit 5, each turn of the winding L1 is a single magnetic circuit winding; the winding L2 is wound on the magnetic circuit 1, the magnetic circuit 2 and the magnetic circuit 3 at the same time, and each turn of the winding L2 is a three-magnetic circuit winding; the winding L2' is wound on the magnetic circuit 3, and each turn of the winding L2' is a double magnetic circuit winding. The windings L2' and L2 are connected in series, and the induced magnetic flux of the winding L2' is opposite to the induced magnetic flux generated by the winding L1 on the winding L2. Thus, winding L2' forms a compensating winding between L1 and L2. In a specific implementation, the winding L2' can also be connected in series with the winding L1, and when connected in series with L1, the induced magnetic flux of the winding L2' also needs to be opposite to the induced magnetic flux generated by the winding L1 on the winding L2. The windings L1, L2 and L2' may include a primary winding and at least one secondary winding; the windings L1, L2 and L2' may be coil windings, planar conductor windings or equivalent windings made of printed circuit boards, or combination of the windings. Wherein, the coil winding is wound on the magnetic core by wires in the direction perpendicular to the magnetic circuit. The wires can be single or multiple wires are wound side by side. Copper foil, aluminum foil and other conductive foil strips are wound; the planar conductor winding is folded from a thin conductor material; when the equivalent winding made of a printed circuit board is used, the printed circuit board used to make the equivalent winding Can be one or more layers. In addition, the magnetic core in this embodiment may be a U-shaped magnetic core, a CD core, a circular core post core or a magnetic core with a central post.

In this embodiment, since the winding L1 has windings on each magnetic circuit of the multi-magnetic circuit transformer, and the winding L2 only has windings on the magnetic circuit 1, the magnetic circuit 2, and the magnetic circuit 3, the distance between the windings L1 and L2 is Mutual inductance will be generated. Therefore, in this embodiment, the compensation winding L2' is connected in series with the winding L2 to offset the mutual inductance generated by L1 on L2, and ultimately there is no mutual inductance between the windings after the windings L1 and L2 are connected in series with L2'. Then L1 can independently form a transformer, and L2 together with L2' can independently form a transformer. The final formed two transformers are connected according to the circuit shown in Figure 1 to form a complete Scott transformer.

The embodiment of the utility model changes the existing two independent magnetic cores into multiple small magnetic cores, which reduces the volume and weight of the transformer, thereby saving materials and reducing production costs. Also, because the leakage inductance of a magnetic system transformer is smaller than that of two independent magnetic system transformers, the loss of the Scott transformer is reduced, and the efficiency is increased by nearly 20%.

The foregoing is a preferred embodiment of the present utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention. It is regarded as the protection scope of the present invention.

Claims (9)

1. A Scott transformer comprising two transformers, the primary coil of one transformer is connected to the center tap of the primary coil of another transformer, it is characterized in that the multiple groups of windings forming the two transformers are wound in the same group on the magnetic material; the magnetic material is composed of a plurality of magnetic cores; the plurality of magnetic cores form a plurality of magnetic circuits. 2. The Scott transformer according to claim 1, characterized in that, the multiple groups of windings forming the two transformers include a first winding and a second winding; The first winding is wound continuously or interspersedly on a single magnetic circuit of the plurality of magnetic circuits; The second winding is simultaneously wound on the even-numbered magnetic circuits of the plurality of magnetic circuits, and the even-numbered magnetic circuits include the magnetic circuit formed by the side columns of the plurality of magnetic cores, the second winding and the Compensation windings are connected in series to any group of the first windings, and the compensation windings are used to decouple the first windings and the second windings. 3. The Scott transformer as claimed in claim 1, wherein said multiple windings forming said two transformers comprise a first winding and a second winding; The first winding is wound continuously or interspersedly on a single magnetic circuit of the plurality of magnetic circuits; The second winding is simultaneously wound on even-numbered magnetic circuits of the plurality of magnetic circuits, and the even-numbered magnetic circuits do not include magnetic circuits formed by side columns of the plurality of magnetic cores. 4. The Scott transformer according to claim 1, characterized in that, the multiple groups of windings forming the two transformers include a first winding and a second winding; The first winding is wound continuously or interspersedly on a single magnetic circuit of the plurality of magnetic circuits; The second winding is wound on the odd magnetic circuits of the plurality of magnetic circuits at the same time, and any one of the second winding and the first winding is connected in series with a compensation winding, and the compensation winding is used for The first winding and the second winding are decoupled. 5. The multi-magnetic circuit transformer according to claim 2 or 4, characterized in that the compensation winding is wound on a single magnetic circuit or simultaneously wound on multiple magnetic circuits. 6. The multi-magnetic circuit transformer according to claim 2 or 4, characterized in that, when the compensation winding is connected in series with the second winding, the induced magnetic flux of the compensation winding and the first winding at the The induced magnetic flux generated on the second winding is opposite; When the compensation winding is connected in series with the first winding, the induced magnetic flux of the compensation winding is opposite to the induced magnetic flux generated by the first winding in the second winding. 7. The Scott transformer according to claim 1, wherein the magnetic core is a U-shaped magnetic core, a CD iron core, a circular core pillar magnetic core or a silicon steel sheet magnetic core with a central pillar. 8. The Scott transformer according to claim 1, characterized in that, the multiple sets of windings constituting the two transformers are coil windings, planar conductor windings or equivalent windings made of printed circuit boards. one of them or any combination thereof. 9. The Scott transformer as claimed in claim 1, wherein each set of windings of said multiple sets of windings constituting two transformers includes a primary winding and at least one secondary winding.

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