CN112888249B - Urban rail transit vehicle and main and auxiliary integrated traction converter thereof - Google Patents
Urban rail transit vehicle and main and auxiliary integrated traction converter thereof Download PDFInfo
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- CN112888249B CN112888249B CN202110042980.1A CN202110042980A CN112888249B CN 112888249 B CN112888249 B CN 112888249B CN 202110042980 A CN202110042980 A CN 202110042980A CN 112888249 B CN112888249 B CN 112888249B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a main and auxiliary integrated traction converter, which comprises: the cabinet body sequentially comprises a left side cavity, a middle cavity and a right side cavity along the X direction; through placing each standardized modularization subassembly of converter in the different cavities of the cabinet body, realize compact high integration, the installation of being convenient for is maintained, and accessible modularization is maintained and is changed when the maintenance, has improved maintenance efficiency. In addition, the internal module to whole cabinet is ventilated and dispelled the heat through cooling fan realization of cabinet, effectively promotes the reliability of converter. In addition, the invention also discloses an urban rail transit vehicle with the main and auxiliary integrated traction converter.
Description
Technical Field
The invention relates to the technical field of urban rail transit vehicles with medium and small traffic volumes, in particular to an urban rail transit vehicle and a main and auxiliary integrated traction converter thereof.
Background
In recent years, rail transit in China, particularly urban rail transit, has been developed rapidly. The traction converter is an important component of a rail transit vehicle, and the function of the traction converter mainly lies in the electric energy conversion between a rail transit power supply grid and a vehicle load: the energy provided by the power grid is provided for the rail transit vehicle after a series of conversions, and on one hand, the energy is provided for a traction motor which is in charge of traction operation on the vehicle, so that the vehicle is driven to operate; on the other hand, the three-phase alternating current power supply and the direct current power supply are required to be provided for other various auxiliary equipment on the train.
The converter mainly comprises a converter cabinet body, a power module, a transformer, a reactor, a control module and other electrical component parts which are arranged inside the converter cabinet body, and a busbar, a cable and the like which are used for connecting various electronic elements. At present, in the process of assembling the converter, all parts are unreasonably arranged, so that the occupied space is large, and the disassembly and maintenance circuit is complex, so that the maintenance cost is high.
Therefore, how to provide a main and auxiliary integrated traction converter, realize integrating, be convenient for install and maintain is the problem that this technical field personnel need to solve urgently.
Disclosure of Invention
In view of this, the invention provides a main-auxiliary integrated traction converter, which realizes integration and is convenient to install and maintain. The invention also provides an urban rail transit vehicle with the main and auxiliary integrated traction converter.
In order to achieve the purpose, the invention provides the following technical scheme:
a primary and secondary integrated traction converter, comprising:
the cabinet body sequentially comprises a left side cavity, a middle cavity and a right side cavity along the X direction;
the left side cavity is sequentially divided into a left side first sub-cavity and a left side second sub-cavity along the Y direction, a control unit assembly is arranged in the left side first sub-cavity, a main traction converter power module is arranged in the left side second sub-cavity, and the main traction converter power module is integrated on the left side air-cooled radiator;
the right side cavity is sequentially divided into a right side first sub cavity, a right side second sub cavity and a right side third sub cavity along the Y direction, a grid-connected power distribution module is arranged in the right side first sub cavity, an auxiliary converter and charger integrated power module which integrates an auxiliary converter power module and a charger power module is arranged in the right side second sub cavity, and the auxiliary converter and charger integrated power module is integrated on the right side air-cooled radiator; the third right sub-cavity is divided into a first upper cavity and a first lower cavity along the Z direction, an auxiliary converter output power distribution unit which is correspondingly matched with the auxiliary converter and the charger integrated power module is placed in the first upper cavity, and the first lower cavity is a heat dissipation air channel cavity which is internally provided with a magnetic element group of the power converter of the auxiliary converter;
the middle cavity is divided into a middle first sub-cavity and a middle second sub-cavity along the Y direction, the middle first sub-cavity is adjacent to the left first sub-cavity and the right first sub-cavity, the middle second sub-cavity is adjacent to the left second sub-cavity and the right third sub-cavity, the middle second sub-cavity is provided with a heat dissipation fan used for cooling the left air-cooled radiator and the right air-cooled radiator, and the middle first sub-cavity is communicated with the middle second sub-cavity and used for exhausting air.
Preferably, in the above-mentioned main and auxiliary integrated traction converter, the power unit of the main traction converter is integrated with a support capacitor, a chopper unit and an inverter unit.
Preferably, in the above-mentioned primary and secondary integrated traction converter, the power unit of the primary traction converter is slidably connected to the cabinet body in a drawer type through a rail.
Preferably, in the main-auxiliary integrated traction converter, the right third sub-cavity is divided into the first upper cavity and the first lower cavity by an electric plate, and the first lower cavity forms the heat dissipation air duct cavity by the electric plate and the cabinet cavity wall.
Preferably, in the main-auxiliary integrated traction converter, the auxiliary converter and the charger integrated power module are in drawer-type sliding connection with the cabinet body through a guide rail.
Preferably, in the main-auxiliary integrated traction converter, the middle second sub-chamber is divided into a second upper-side chamber and a second lower-side chamber by a baffle and a chamber wall, the cooling fan is communicated with the second upper-side chamber and the second lower-side chamber, and the second lower-side chamber is an air inlet chamber of the cooling fan and is communicated with the first lower-side chamber, the right second sub-chamber and the left second sub-chamber;
the second upper side cavity is an air outlet cavity of the heat radiation fan, and the second upper side cavity is communicated with the middle first sub-cavity.
Preferably, in the main-auxiliary integrated traction converter, the left air-cooled radiator and the right air-cooled radiator are both fin radiators.
Preferably, in the above-described main-auxiliary integrated traction converter, an auxiliary converter input filter reactor and an auxiliary converter output filter reactor are provided in the second lower-side cavity.
Preferably, in the above-mentioned main-auxiliary integrated traction converter, a main traction converter input filter reactor is disposed in the second upper side cavity.
Preferably, in the main-auxiliary integrated traction converter, the first lower cavity, the right second sub-cavity and the left second sub-cavity are provided with air inlets, and the middle first sub-cavity is provided with an air outlet.
Preferably, in the above-mentioned main-auxiliary integrated traction converter, the air inlets of the second lower cavity, the first lower cavity, the right second sub-cavity and the left second sub-cavity are all provided with a filtering module for filtering the inlet air.
Preferably, in the above-described primary and secondary integrated traction converter, the magnetic element group of the power converter of the secondary converter includes a transformer and a reactor assembly.
Preferably, in the main-auxiliary integrated traction converter, the main-auxiliary integrated traction converter further comprises temperature sensors arranged in the left side cavity and the right side cavity and used for detecting the temperature of the internal module, and the temperature sensors are in signal connection with the cooling fan.
An urban rail transit vehicle, comprising a main and auxiliary integrated traction converter as described in any one of the above.
According to the main-auxiliary integrated traction converter provided by the invention, each standardized modular component is placed in different chambers of the cabinet body, so that the compact high integration is realized, the installation and maintenance are convenient, the modular traction converter can be maintained and replaced during maintenance, and the maintenance efficiency is improved. In addition, the cabinet body realizes carrying out ventilation cooling to the internal module of whole cabinet through cooling fan, effectively promotes the reliability of converter.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an internal top view of a primary and secondary integrated traction converter disclosed in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air duct of the main-auxiliary integrated traction converter disclosed in the embodiment of the present invention.
Detailed Description
The invention discloses a main and auxiliary integrated traction converter, which realizes integration and is convenient to install and maintain. The invention also discloses an urban rail transit vehicle with the main and auxiliary integrated traction converter.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the present application further discloses a main-auxiliary integrated traction converter, which includes a cabinet body 1, and a main traction converter and an auxiliary converter arranged in the cabinet body, wherein when the main traction converter and the auxiliary converter work, a train obtains power input from a power supply grid, and provides power and control for a train traction motor, an auxiliary variable load and a charger load through a series of conversion.
Specifically, the cabinet body 1 in this application includes left side chamber, middle chamber and right side chamber along the X direction in proper order, is divided into three cavity with the cabinet body, arranges the subregion for electrical component. The left cavity is sequentially divided into a left first sub-cavity 1A and a left second sub-cavity 1B along the Y direction, a control unit assembly 110 is arranged in the left first sub-cavity 1A, the control unit assembly 110 comprises a control unit DCU and an auxiliary power supply module, a main traction converter power module 101 is arranged in the left second sub-cavity 1B, and the main traction converter power module 101 is integrated on the left air-cooled radiator; the right side cavity is sequentially divided into a right side first sub-cavity 1E, a right side second sub-cavity 1F and a right side third sub-cavity 1G along the Y direction, wherein a grid-connected power distribution module 103 is arranged in the right side first sub-cavity 1E, an auxiliary converter and charger integrated power module 102 which integrates an auxiliary converter power module and a charger power module is arranged in the right side second sub-cavity 1F, and the auxiliary converter and charger integrated power module 102 is integrated on the right side air-cooled radiator; the third right sub-cavity 1G is divided into a first upper cavity and a first lower cavity along the Z direction, an auxiliary converter output power distribution unit 108 which is correspondingly matched with the auxiliary converter and charger integrated power module 102 is arranged in the first upper cavity, and the first lower cavity is a heat dissipation air channel cavity which is internally provided with a magnetic element group 107 of the power converter of the auxiliary converter; the middle cavity is divided into a middle first sub-cavity 1D and a middle second sub-cavity 1C along the Y direction, wherein the middle first sub-cavity 1D is adjacent to the left first sub-cavity 1A and the right first sub-cavity 1E, the middle second sub-cavity 1C is adjacent to the left second sub-cavity 1B, the right second sub-cavity 1F and the right third sub-cavity 1G, the middle second sub-cavity 1C is provided with a cooling fan 109 used for cooling the left air-cooled radiator and the right air-cooled radiator, and the middle first sub-cavity 1D is communicated with the middle second sub-cavity 1C and used for exhausting air.
The converter in this application places each standardized modularization subassembly in the different cavities of the cabinet body 1, realizes compact high integration, and the installation of being convenient for is maintained, and accessible modularization is maintained and is changed when the maintenance, has improved maintenance efficiency. In addition, the module in the whole cabinet body 1 is ventilated and cooled through the cooling fan 109 in the cabinet body 1, and the reliability of the converter is effectively improved.
In a further embodiment, the main traction converter power unit 101 is integrated with a support capacitor, a chopper unit and an inverter unit. It will be understood by those skilled in the art that, for the structure of the main traction converter power unit 101 for realizing the function of the main traction converter, different power units can be integrated according to different functional requirements, and all are within the protection scope. For the connection of the support capacitor, the chopper unit and the inverter unit, reference is made to the prior art, while the arrangement position and manner of the respective units are not specifically limited herein, the core of the present application is to arrange the power unit 101 of the main traction converter and the functional unit of the auxiliary converter in different chambers.
For the convenience of maintenance, the main traction converter power unit 101 is slidably connected with the cabinet 1 in a drawer mode through a rail. So set up, when main traction converter power unit 101 is looked over to needs, the accessible pull realizes exposing main traction converter power unit 101 in cabinet body 1, and the operator of being convenient for looks over. Here, a specific installation manner of the main traction converter power unit 101 is disclosed, and in practice, the main traction converter power unit 101 inside the cabinet body can also be checked in a door opening manner.
In a preferred embodiment, the right third sub-chamber 1G is divided into a first upper chamber and a first lower chamber by an electric board, and the first lower chamber forms a heat dissipation air duct chamber by the electric board and the wall of the cabinet body chamber. The radiating air channel cavity is formed by enclosing the electric board and the wall of the cabinet body cavity, so that the structure is simple, additional parts are not needed, the structure is simplified, and the volume of the cabinet body is reduced.
In a further embodiment, the auxiliary converter and the charger are integrated into an integrated power module 102, and the integrated power module is slidably connected with the cabinet 1 in a drawer type through a guide rail. The guide rails are connected in a sliding manner, so that the auxiliary converter and charger integrated power module 102 can be maintained and replaced conveniently, and in practice, the auxiliary converter and charger integrated power module 102 arranged in the cabinet body 1 can be maintained in a door-opening manner.
In a preferred embodiment, the middle second sub-chamber 1C is divided into a second upper chamber and a second lower chamber by the baffle and the chamber wall, the heat dissipation fan 109 communicates with the second upper chamber and the second lower chamber, and the second lower chamber is an air inlet chamber of the heat dissipation fan 109 and is communicated with the first lower chamber, the right second sub-chamber 1F and the left second sub-chamber 1B; the second upper side cavity is an air outlet cavity of the heat dissipation fan 109, and the second upper side cavity is communicated with the middle first sub-cavity 1D. The middle second sub-cavity 1C is divided into two cavities to form an air inlet cavity and an air outlet cavity, and the circulation of air is realized through the work of a heat dissipation fan to finish heat dissipation. The second chamber 1C may not be divided in practice.
In a specific embodiment, the left air-cooled radiator and the right air-cooled radiator are both fin radiators. When the cooling device is installed, fins of the radiator need to extend into the cooling air duct cavities of the corresponding cavities so as to be cooled forcibly.
The second lower side cavity disclosed in the above embodiments is provided with an auxiliary converter input filter reactor 105 and an auxiliary converter output filter reactor 106, specifically, the auxiliary converter input filter reactor 105: the capacity and the volume are small, and the reactor is generally an iron core reactor; auxiliary converter output filter reactor 106: the capacity and the volume are small, and the reactor is generally an iron core reactor. The second upper side cavity is internally provided with a main traction converter input filter reactor 104, and the main traction converter input filter reactor is designed into an air reactor generally with a relatively large volume in consideration of capacity, light weight and short circuit resistance in practice.
First downside chamber, right side second minute chamber 1F and left side second in this application divide chamber 1B all to have the air intake. During operation, cooling air outside the cabinet body 1 passes through the air channel cavity of the main traction converter power module 101, the auxiliary converter and charger integrated power module 102 and the auxiliary converter output power distribution unit 108, flows into the second lower side cavity, is sucked into the second upper side cavity through the cooling fan 109, and is finally discharged out of the cabinet body 1 through the middle first sub-cavity 1D, so that ventilation and heat dissipation of the whole cabinet are realized.
In order to guarantee the stability of the inner module of the converter, the air inlets of the second lower cavity, the first lower cavity, the right second sub-cavity 1F and the left second sub-cavity 1B disclosed in the application are all provided with a filtering module for filtering the inlet air. The specific structure of the filter module can be a filter screen structure, and those skilled in the art can understand that the specific structure of the filter module can be set according to different needs and is all within the protection range.
The magnetic element group of the power converter of the auxiliary converter disclosed in this application comprises a transformer and a reactor assembly. The reactor assembly can be arranged according to different requirements, the reactor in the functional component of the converter is in a protection range, and the reactor assembly can be arranged by a person skilled in the art according to the requirements.
In a further embodiment, the heat dissipation module further includes temperature sensors disposed in the left and right side cavities for detecting temperatures of the internal modules, and the temperature sensors are in signal connection with the heat dissipation fan 109. Specifically, the cooling fan 109 is a fan that can receive an instruction from the entire cabinet control unit assembly 110 to adjust the operating point. The main traction converter power module 101, the auxiliary converter and charger integrated power module 102 and all magnetic components in the cooling air duct system are provided with temperature sensors, signal receiving and logic judgment calculation are realized by the control unit assembly 110, and an operating point instruction is given to the cooling fan 109, so that the fan operates at the optimal operating point, full-speed operation is not needed, noise is reduced, all components are maintained in a stable operating temperature range, and the reliability of the converter is improved.
In addition, the application also discloses an urban rail transit vehicle, which comprises a main and auxiliary integrated traction converter, wherein the main and auxiliary integrated traction converter is the main and auxiliary integrated traction converter disclosed in the embodiment, so that the urban rail transit vehicle with the main and auxiliary integrated traction converter also has all the technical effects, and the details are not repeated herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A main and auxiliary integrated traction converter is characterized by comprising:
the cabinet body (1) sequentially comprises a left side cavity, a middle cavity and a right side cavity along the X direction;
the left side cavity is sequentially divided into a left side first sub-cavity (1A) and a left side second sub-cavity (1B) along the Y direction, a control unit assembly (110) is arranged in the left side first sub-cavity (1A), a main traction converter power module (101) is arranged in the left side second sub-cavity (1B), and the main traction converter power module (101) is integrated on the left side air-cooled radiator;
the right side cavity is sequentially divided into a right side first sub-cavity (1E), a right side second sub-cavity (1F) and a right side third sub-cavity (1G) along the Y direction, a grid-connected power distribution module (103) is arranged in the right side first sub-cavity (1E), an auxiliary converter and charger integrated power module (102) which integrates an auxiliary converter power module and a charger power module is arranged in the right side second sub-cavity (1F), and the auxiliary converter and charger integrated power module (102) is integrated on the right side air-cooled radiator; the right third sub-cavity (1G) is divided into a first upper side cavity and a first lower side cavity along the Z direction, an auxiliary converter output power distribution unit (108) which is correspondingly matched with the auxiliary converter and charger integrated power module (102) is placed in the first upper side cavity, the first lower side cavity is a heat dissipation air channel cavity, and a magnetic component group (107) of a power converter of the auxiliary converter is arranged in the first lower side cavity;
the middle cavity is divided into a middle first sub-cavity (1D) and a middle second sub-cavity (1C) along the Y direction, the middle first sub-cavity (1D) is adjacent to the left first sub-cavity (1A) and the right first sub-cavity (1E), the middle second sub-cavity (1C) is adjacent to the left second sub-cavity (1B) and the right second sub-cavity (1F) and the right third sub-cavity (1G), the middle second sub-cavity (1C) is provided with a heat dissipation fan (109) for dissipating heat of the left air-cooled radiator and the right air-cooled radiator, and the middle first sub-cavity (1D) is communicated with the middle second sub-cavity (1C) for exhausting air;
the main traction converter power unit (101) is in drawer-type sliding connection with the cabinet body (1) through a rail;
the right third sub-cavity (1G) is divided into a first upper cavity and a first lower cavity through an electric plate, and the first lower cavity forms the heat dissipation air channel cavity through the electric plate and the wall of the cabinet body cavity;
the middle second sub-cavity (1C) is divided into a second upper side cavity and a second lower side cavity through a baffle and a cavity wall, the heat dissipation fan (109) is communicated with the second upper side cavity and the second lower side cavity, and the second lower side cavity is an air inlet cavity of the heat dissipation fan (109) and is communicated with the first lower side cavity, the right second sub-cavity and the left second sub-cavity;
the second upper side cavity is an air outlet cavity of the heat radiation fan, and the second upper side cavity (1F) is communicated with the middle first sub-cavity (1D).
2. The main-auxiliary integrated traction converter according to claim 1, characterized in that said main traction converter power unit (101) integrates a support capacitor, a chopper unit and an inverter unit.
3. The main and auxiliary integrated traction converter according to claim 1, wherein the auxiliary converter and charger integrated power module (102) is slidably connected with the cabinet body (1) in a drawer type through a guide rail.
4. The primary and secondary integrated traction converter as claimed in claim 1, wherein the left air-cooled radiator and the right air-cooled radiator are both fin radiators.
5. The primary and secondary integrated traction converter according to claim 1, wherein an auxiliary converter input filter reactor (105) and an auxiliary converter output filter reactor (106) are disposed in the second lower side cavity.
6. The primary and secondary integrated traction converter according to claim 1, wherein a primary traction converter input filter reactor (104) is disposed in the second upper side cavity.
7. The traction converter according to claim 1, wherein said first lower chamber, said second right sub-chamber (1F) and said second left sub-chamber (1B) each have an air inlet and said first middle sub-chamber (1D) has an air outlet.
8. The main and auxiliary integrated traction converter according to claim 7, wherein the air inlets of the second lower chamber, the first lower chamber, the right second sub-chamber (1F) and the left second sub-chamber (1B) are all provided with a filtering module for filtering the inlet air.
9. The primary and secondary integrated traction converter according to claim 1, wherein the magnetic element set of the power converter of the secondary converter comprises a transformer and reactor assembly.
10. The primary and secondary integrated traction converter according to any one of claims 1 to 9, further comprising temperature sensors disposed in the left and right side cavities for detecting the temperature of the internal module, wherein the temperature sensors are in signal connection with the heat dissipation fan (109).
11. An urban rail transit vehicle comprising a primary and secondary integrated traction inverter as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110042980.1A CN112888249B (en) | 2021-01-13 | 2021-01-13 | Urban rail transit vehicle and main and auxiliary integrated traction converter thereof |
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| CN202110042980.1A CN112888249B (en) | 2021-01-13 | 2021-01-13 | Urban rail transit vehicle and main and auxiliary integrated traction converter thereof |
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| CN112888249B true CN112888249B (en) | 2022-06-14 |
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| CN113659806A (en) * | 2021-08-18 | 2021-11-16 | 中车青岛四方车辆研究所有限公司 | Auxiliary converter device |
| CN113659849B (en) * | 2021-08-18 | 2023-09-22 | 中车青岛四方车辆研究所有限公司 | Auxiliary converter and railway vehicle |
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| CN206212552U (en) * | 2016-11-28 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of traction convertor for track traffic |
| CN207234652U (en) * | 2017-09-28 | 2018-04-13 | 株洲中车时代电气股份有限公司 | A kind of integrated form traction convertor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102355149A (en) * | 2011-10-18 | 2012-02-15 | 华为技术有限公司 | Inverter, sealing air flue and heat dissipation system |
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Patent Citations (3)
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|---|---|---|---|---|
| CN205105085U (en) * | 2015-11-05 | 2016-03-23 | 株洲南车时代电气股份有限公司 | Supplementary deflector of diesel locomotive and diesel locomotive |
| CN206212552U (en) * | 2016-11-28 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of traction convertor for track traffic |
| CN207234652U (en) * | 2017-09-28 | 2018-04-13 | 株洲中车时代电气股份有限公司 | A kind of integrated form traction convertor |
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