Relying on the Suzhou Metro Line 3 project, a new generation of permanent magnet synchronous traction system developed by Huichuan Jingwei Railway has been operating in Suzhou Rail Transit Line 3 0345 vehicles for more than 90,000 kilometers. After more than a year of energy-saving verification tests, 0345 vehicles The comprehensive energy saving rate is 16%~20%. If the whole line of Suzhou Line 3 (45.2 kilometers in length) is equipped with this traction system, it is expected to save 5 million yuan in electricity bills per year. Calculated based on the 30-year design life of subway trains, the electricity bill can be saved by 1.5 billion. With the increase of passenger capacity and equipped with ground energy feeder, the comprehensive energy saving rate is expected to reach 30%.
In November 2021, the Ministry of Industry and Information Technology and the State Administration for Market Regulation jointly issued the “Motor Energy Efficiency Improvement Plan (2021-2023)”. The permanent magnetization of the motor meets the high efficiency requirements of the motor drive system. In the field of rail transit, the promotion of the permanent magnet motor traction system and the continuous improvement of the energy efficiency of the motor system can support the rail transit industry to save energy and improve efficiency, and help achieve the goal of carbon peaking and carbon neutrality.
As a means of transportation, the subway has a history of nearly 160 years, and its traction technology is constantly changing. The first-generation traction system is a DC motor traction system; the second-generation traction system is an asynchronous motor traction system, which is also the current mainstream traction system. ; Permanent magnet traction system is currently recognized by the industry as the development direction of the next-generation new technology of rail transit vehicle traction system.
A permanent magnet motor is a motor with a permanent magnet in the rotor. It has many advantages such as reliable operation, small size, light weight, low loss and high efficiency, and belongs to ultra-high-efficiency motors. Compared with the asynchronous motor traction system, the permanent magnet traction system has high efficiency, low energy consumption, more obvious energy saving effect, and very significant economic benefits.
The new generation of permanent magnet synchronous traction system of Inovance Jingwei Track includes high-efficiency hybrid reluctance traction motor, traction converter, braking resistor, etc. Compared with the asynchronous motor traction system, the train equipped with this system consumes less energy during traction. More energy is fed back during electric braking. Among them, the high-efficiency hybrid reluctance motor has the remarkable characteristics of simple structure, reliable operation, small size, light weight, low loss, high efficiency, and flexible appearance and size of the motor.
If the whole line adopts the permanent magnet traction system, the operating cost of Suzhou Metro Line 3 will be greatly reduced
With the advancement and implementation of the dual-carbon strategy in the rail transit industry, the requirements for train energy conservation are getting higher and higher, and the traction motor will move towards permanent magnetization, digitization and integration in the future. At present, the application ratio of rare earth permanent magnet motors in the rail transit industry is still very low, and the potential space for energy saving is huge.
Powerful R&D platform, Inovance permanent magnet motor technology
As a senior high-end motor player, Inovance Technology focuses on servo motors, automotive motors, and traction motors. The rich application performance proves the stability, reliability and operation accuracy of Inovance motors. At present, Inovance Technology brings advanced motor technology to the market. In the field of permanent magnet industrial motors, industrial permanent magnet motors have Inovance’s automotive-grade design concept, which has the advantages of high precision and low failure rate, and is supported by sufficient R&D strength behind it.
Motor Technology – Leading Design Approaches
local optimizationStator parameter optimization: number of turns, tooth width, slot depth, etc.; rotor parameter optimization: number, position, air slot shape, position, etc. of magnetic isolation bridges;
Global optimization
Parameter optimization of the whole machine: pole-slot fit, inner and outer diameters of stator and rotor, air gap size; high-efficiency zone orientation optimization and NVH design target setting;
Electromagnetic solution optimization
Motor Technology – Design Methods for System Efficiency
It has the ability to analyze working conditions, study the characteristics of electrical control loss of the motor, and optimize the system efficiency through joint design.
Motor Technology – Design Methods for Noise and Vibration
NVH conducts design testing and verification from system to component, accurately locates problems, and ensures product NVH characteristics. (Electromagnetic NVH, Structural NVH, Electronically Controlled NVH)
04 Motor technology – design method of anti-demagnetization
Permanent magnet demagnetization check, the back EMF reduction does not exceed 1%
Three-phase short-circuit demagnetization checkLow speed 3 times overload demagnetization check
Constant power 1.5 times rated speed running demagnetization check
Inovance ships more than 3 million high-efficiency motors using rare earth permanent magnets every year
05 Motor Technology – Test Capability
The total area of the test laboratory is about 10,000 square meters, and the investment is about 250 million yuan. The main equipment: AVL dynamometer (20,000 rpm), EMC darkroom, dSPACE HIL, NVH test equipment;The test center is operated and managed in accordance with ISO/IEC 17025 (CNAS laboratory accreditation criteria) and has been accredited by CNAS.
Post time:
Jul-26-2022