CN203118728U - Magnetic integrated shell-type traction transformer - Google Patents

Abstract

The utility model discloses a magnetically integrated shell-type traction transformer. The transformer comprises a main iron core, a high-voltage winding and a traction winding. The high-voltage winding and the traction winding are wound on the main iron core in an interlaced structure. Several sections of air-gap iron cores composed of silicon steel sheets are placed in the gap. The lamination direction of the air-gap iron cores is consistent with the flow path of the leakage flux between the two windings. The width of the air-gap iron cores is the same as the width of the iron yoke. To be consistent, the number of segments of the air-gap iron core and the gaps between segments need to be calculated according to the requirements of the actual system for the percentage of short-circuit impedance of the shell-type traction transformer. The utility model arranges segmented air-gap iron cores in the gap between the high-voltage winding and the traction winding of the transformer, provides a low reluctance flux flow path for the leakage flux between the high-voltage winding and the traction winding, and increases the leakage reactance of the transformer , reducing the copper loss and eddy current loss of the transformer, thereby improving the operating efficiency of the transformer.

Description

Magnetic integrated shell type traction transformer

technical field

The utility model relates to a traction transformer, in particular to a magnetically integrated shell type traction transformer.

Background technique

With the development of my country's electrified railway, urban rail traction and shipbuilding industries, all of them involve electric traction power supply system. Due to the special requirements of the industry, the space reserved by the overall equipment for the electric traction power supply system is strictly limited, and the supporting equipment for the traction power supply system is required to have functions such as small size and low electromagnetic interference, so that the design of related supporting power equipment , Manufacturing enterprises put forward higher requirements.

Traction transformers are widely used in electric traction power supply systems in the above fields, and occupy a large space and volume in the entire system, and their electromagnetic interference is also large. If effective control measures are not taken, it is easy to damage other supporting power electronic circuits. , The control circuit produces serious electromagnetic interference. In view of the above-mentioned technical problems, on the one hand, the volume of the electric traction power supply system is reduced through the idea of system integration design, through modular and compact design, but at the same time, it will also bring a series of other technical problems, such as: large electromagnetic interference , large stray loss, local overheating, etc. the

Contents of the invention

In order to solve the shortcomings of traditional traction transformers such as large electromagnetic interference, large stray loss, and large volume, the utility model proposes a magnetically integrated shell-type traction transformer with low electromagnetic interference, small stray loss, and small volume.

The technical solution adopted by the utility model to solve its technical problems is: including the main iron core, high-voltage winding, and traction winding. The high-voltage winding and traction winding are wound on the main iron core in an interlaced structure. Several sections of air-gap iron cores are placed in the gap.

Further, the above-mentioned air-gap iron core is made of silicon steel sheets.

Further, the lamination direction of the air-gap iron core is consistent with the flow path of the leakage flux between the two windings.

Further, the width of the air-gap iron core is consistent with the width of the iron yoke.

The beneficial effects of the utility model are: the utility model adopts a shell structure, and several sections of air-gap iron cores made of silicon steel sheets are arranged between the transformer high-voltage winding and the traction winding. A low reluctance path is established, which is beneficial to restrict the flow path of leakage flux and reduce the divergence of leakage magnetic field inside the transformer. Under the same structural size condition, on the one hand, the leakage inductance of the transformer can be improved; on the other hand, it can Reduce the stray loss of the metal structural parts of the transformer, thereby improving the operating environment of the transformer and reducing its electromagnetic interference to other devices.

Below in conjunction with accompanying drawing, the utility model is further described.

Description of drawings

Fig. 1 is the front view of the utility model.

In the figure: 1. Main iron core, 2. Air gap iron core, 3. High voltage winding, 4. Traction winding.

Detailed ways

Referring to Fig. 1, the utility model comprises main iron core 1, high voltage winding 3, traction winding 4, is characterized in that: high voltage winding 3 and traction winding 4 are wound on the main iron core 1 in a staggered structure, high voltage winding 3 and traction winding There are several sections of air-gap iron core 2 made of silicon steel sheets in the gap between 4. The number of sections of the air-gap iron core 2 and the gap between sections need to be based on the percentage of the short-circuit impedance of the shell-type traction transformer in the actual system. Ask to calculate.

The lamination direction of the air-gap core 2 is along the direction of the leakage field between the high-voltage winding 3 and the traction winding 4. The existence of the air-gap core 2 provides a path for the leakage field between the high-voltage winding 3 and the traction winding 4. Low reluctance path, thereby effectively reducing the reluctance of the leakage magnetic circuit.

The length of the inter-winding air gap iron core 2 is consistent with the width of the iron yoke of the main iron core 1, which can effectively reduce the leakage magnetic flux of some windings located on both sides of the iron core, thereby reducing the eddy current loss generated on the wall of the fried dough stick.

The utility model arranges several sections of air-gap iron cores composed of silicon steel sheets in the gap between the interlaced high-voltage winding and the traction winding to provide a circulation path with a small magnetic resistance for the leakage flux between the windings, thereby ensuring Under the size condition, it has a large leakage inductance; under the same leakage inductance condition, it has a small structure size; through the high magnetic permeability core structure, the leakage flux is effectively confined in the winding gap, which can effectively reduce the winding eddy current loss, stray eddy current loss of internal metal structure.

Claims (4)

1. integrated shell type traction transformer of magnetic, comprise main iron core, high pressure winding, traction winding, it is characterized in that: the high pressure winding adopts the alternating expression structure on main iron core with the traction winding, is placed with several sections air-gap iron cores in the gap between high pressure winding and the traction winding.

2. the integrated shell type traction transformer of magnetic according to claim 1, it is characterized in that: described air-gap iron core is made of silicon steel sheet.

3. the integrated shell type traction transformer of magnetic according to claim 1 and 2, it is characterized in that: the circulation path of leakage flux is consistent between described air-gap iron core lamination direction and two windings.

4. the integrated shell type traction transformer of magnetic according to claim 1 and 2, it is characterized in that: the width of described air-gap iron core and iron yoke width are consistent.

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