By the end of 2022, the operating mileage of urban rail transit in mainland China will exceed 10,000, which once again marks a historical node of rapid development for the urban rail transit industry.
Jingwei Rail, a subsidiary of Inovance Technology, has currently won bids for traction system projects for 19 subway lines in 8 cities in China (6 of which are fully automatic driving), and has won bids for 3,320 vehicles (1,074 of which are fully automatic driving). The earliest line to be put into operation is Suzhou Metro Line 2, which has been operating safely for 9 years.
Behind the “10,000” operating mileage, it implies that the urban rail transit industry has entered a stage of high-quality development with green and intelligent development. “Permanent magnet traction” will be fully demonstrated at the Beijing-Qingdao Rail Exhibition and the first Urban Rail High-Tech Fair.
From April 27 to April 29, 2023, the “Beijing-Qingdao International Urban Rail Transit Exhibition and Summit Forum” and the “First China Urban Rail Transit High-Tech Achievements Fair” will be held at China Railway Qingdao World Expo City. Jingwei Rail takes “Promoting permanent magnet traction with hybrid reluctance technology” as its theme, bringing innovative achievements in smart urban rail and green and low-carbon technologies.
Subway permanent magnet synchronous motor (high-efficiency hybrid reluctance)
This series of traction motors are permanent magnet synchronous, self-ventilated and cooled closed motors, using multi-layer magnetic circuit technology; the traction power can cover 190-275kW, meeting the application of 80-120km/h subway A/B type vehicles and 140~160km/h urban trains.
Main features and advantages:
Wide-area high efficiency, safe and reliable, simple maintenance
■ The highest efficiency can reach 97.5%, and the area with efficiency greater than 90% exceeds 88%,
■ Compared with the traditional asynchronous motor traction system, the measured energy saving rate is 16%-20%. If the subway line is equipped with a ground energy feedback device, the comprehensive energy saving rate is expected to exceed 30%, and each train can save about 3 to 4 million yuan in electricity bills during its entire life cycle.
■ It adopts a multi-layer magnetic circuit structure with low back electromotive force, which reduces the risk of failure under extreme working conditions and improves the safety of the motor.
Application performance: Suzhou Metro Line 3 train (already in operation), Guangzhou Metro Line 1 train (already in operation)
Metro permanent magnet direct drive traction motor
The number of poles of this permanent magnet synchronous direct drive motor is 12. Due to the use of the new silicon carbide technology, the motor achieves natural cooling. The motor is designed for subway vehicles and meets the requirements of IEC 60349-4. It adopts the shaft-holding installation method and is directly installed on the axle to drive an axle on the bogie.
Main features and advantages:
■ High-voltage silicon carbide (SiC) devices are used to replace traditional IGBTs, which realizes the miniaturization, modularization and integration of the converter, and increases the switching frequency, reduces the output voltage harmonics, and reduces the loss of the motor;
■ Due to the use of direct-drive motors, gearboxes and couplings are eliminated, which improves the overall efficiency of the transmission system and the energy saving rate of the system;
■ Thanks to the advanced natural cooling design of the motor, the weight of the motor is less than that of the traditional asynchronous motor plus gearbox and coupling, making the energy saving effect of the whole vehicle more significant;
■ Due to the closed structure of the direct-drive motor, the motor is in a relatively low-speed operation state, and there is no gearbox and internal fan, the system noise is reduced by 20dB, which improves the comfort of passengers;
■ The closed structure direct-drive motor with natural cooling is used, which reduces the daily cleaning and gearbox oil change work, and reduces the daily maintenance workload.
Silicon carbide power module
This product is used in the permanent magnet direct drive motor traction system. It integrates a three-phase inverter bridge, drive circuit, high-voltage bus circuit and filter, etc., forming a fully functional three-phase inverter that can drive a motor to work.
Main features and advantages:
■ The module uses high-voltage silicon carbide (SiC) MOSFET devices to replace traditional IGBTs, realizing the miniaturization, modularization and integration of the converter.
■ Based on the excellent characteristics of SiC devices, the converter increases the switching frequency, reduces the output voltage harmonics, and reduces the loss of the motor, which helps to achieve low noise, light weight, high efficiency and easy maintenance of the motor.
Permanent magnet synchronous traction motor for trams
This traction motor is a permanent magnet synchronous, 44-pole, water-cooled closed motor that meets the requirements of IEC 60349-4 and is powered by a permanent magnet traction inverter. The motor directly drives the vehicle wheelset through a clutch to provide power for the vehicle.
Main features and advantages:
Energy-saving, high efficiency, low noise, easy maintenance
■ The overall efficiency of the transmission system has been improved, and the system energy-saving effect is significant. Each permanent magnet direct drive motor drives one wheel, so that the vehicle has a better low-floor layout and small curve passing performance;
■ The direct drive motor adopts a closed structure, the motor is in a relatively low-speed operation state, there is no gearbox, and water cooling is used, which improves passenger comfort and reduces daily maintenance workload.
High-frequency auxiliary converter
Main features and advantages:
■ Strong redundancy: Each auxiliary converter box is equipped with 2 independent auxiliary inverter units and chargers. The 2 chargers in each auxiliary converter box are also connected in parallel for output, which improves the redundancy of battery charging and simplifies the wiring of the whole vehicle;
■ Fast grid connection: The 4 auxiliary inverter units adopt non-communication fast grid-connected power supply technology. Regardless of whether there is network communication or not, the grid connection operation of the auxiliary inverter of the entire train can be completed within 2 seconds;
■ Lightweight: The high-frequency soft switching technology is adopted, and the size of the transformer is significantly reduced;
■ Safety: The AC output adopts a three-phase four-wire system, and the neutral line ungrounded solution (IT system) is recommended, and an insulation detection device is configured in the auxiliary converter;
■ Easy to maintain: The power unit is modularized and miniaturized;
■ Intelligence: Supports the health management function of core components;
■ Mature application: Since 2014, high-frequency auxiliary converters have been used in batches, with a total of more than 1,000 units.
Traction health management unit
This product uploads the intelligent monitoring and diagnostic data of the traction system to the on-board wireless communication equipment and the ground server through Ethernet for big data analysis, and displays the intelligent diagnosis results through various terminals such as web pages and mobile phone APPs to achieve fault pre-diagnosis and provide maintenance advice information.
Main features and advantages:
Intelligent, scalable, strong performance
■ Support remote program update, easy maintenance;
■ Realize the pre-diagnosis of traction system equipment and component failures, greatly reducing daily operation and maintenance costs.
On-board LINUX system controller
Applied to scenarios such as air conditioning controllers, energy consumption recorders, and on-board health management units.
Main features and advantages:
■ High performance: using a high-performance 4-core A7 chip, the main frequency can reach 1.2GHz, support up to 16G storage space, and use LINUX operating system;
■ Deep localization: core components are all domestic products with mature applications;
■ Rich interfaces: support real-time Ethernet TRDP, MVB, CAN, RS485 and other communication interfaces;
■ Flexible configuration: with a main board and 4 slave boards (DIO1, DIO2, AIO, expansion valve), different application scenarios can be flexibly combined. The DIO board is compatible with 110V/24V DC, and the DO interface can be configured as DI through software. Voltage and current analog sampling can be configured through jumpers;
■ Mature and reliable: adopt hardware solutions with mature application experience, and verify the reliability of the solutions through environmental experiments;
■ Compact integration: the maximum width is only 270mm, and the screen can be integrated (optional);
■ Powerful: support data recorder (black box), custom offline fault diagnosis and other functions;
■ Easy to develop and debug: use the same maintenance software DISMON as the traction system. It can realize real-time data display, curve printing, and FPGA software remote burning functions. Fault protection logic, IO interface, and data recorder sampling variables can be configured through excel tables.
■ Those who strive first are the first, and those who innovate are strong. At this exhibition, Huichuan Jingwei Rail will gather the cutting-edge technologies of permanent magnets in the field of urban rail and the innovation of smart urban rail technology, decode the innovative technologies of cross-border integration of hybrid reluctance motors for new energy vehicles, and promote permanent magnet traction with hybrid reluctance technology. There are more exciting~
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