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Development overview and trend Analysis of  electric drive system of new energy vehicle GAO Lingyu, ZHOU Huijun, WANG Cheng, PEI Ruilin Electrical Steel    2020, 2 (1): 27-31.   Abstract （317）      PDF（pc） （723KB）（1733）       Knowledge map    Save The development history and market status of new energy electric systems for new energy vehicles(EV), and their developments of electric drive systems, vehicle types and new electric motors and future trends, have been analyzed and researched in this paper, which has certain help to guide the application of electric steel and other materials to new energy vehicles. Related Articles | Metrics

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Research on production capacity and demand of high performance electrical steel in China#br# CHEN Zhuo Electrical Steel    2020, 2 (1): 1-8.   Abstract （262）      PDF（pc） （1241KB）（1375）       Knowledge map    Save High performance electrical steel is one of the important raw material products indispensable for the modernization construction, highquality development and people's life in China. It is also the development direction of highquality development, product upgrading, energy conservation and environmental protection of electrical steel industry in China.The production capacity of electrical steel, the capacity of normalization (acid pickling), the capacity ,output change and apparent consumption of electrical steel in recent five years, were studied and analyzed in this paper ,as well as the future demands of transformer to high magnetic induction oriented electrical steel (HiB), and medium and small motors, large motors, household appliances, new energy vehicles, emerging fields, etc. to high grade (high efficiency, high magnetic induction) nonoriented electrical steel, and electric power, aerospace, medical devices and household appliances etc. to extremely thin electrical steel strip (the thickness less than 0.1 mm). At the same time, the demand of high performance electrical steel in China is predicted and some suggestions are put forward. Related Articles | Metrics

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Research on cold rolling equipment status and cold rolling technology of electrical steel ZHANG Fengquan, HU Wencai Electrical Steel    2019, 1 (2): 7-13.   Abstract （199）      PDF（pc） （1987KB）（1062）       Knowledge map    Save This paper introduced the cold rolling equipment of electrical steel in both domestic and international enterprises. Combining with the cold rolling equipment of electrical steel,the cold rolling technologies of highgrade electrical steel were also researched, which could give advice on related electrical steel grades and equipment selection. Related Articles | Metrics

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Analysis of new energy vehicles development and electrical steel demand for driving motors YAN Ming, XIAO Haihang, HUANG Xi, ZHANG Yandong Electrical Steel    2020, 2 (4): 1-.   Abstract （283）      PDF（pc） （1022KB）（1240）       Knowledge map    Save The impact and effectiveness of the policies for new energy vehicles on industrial development were analyzed and summarized, and the  future market capacity trend was predicted. Meanwhile the future market capacity of electrical steels used in electric vehicles was initially analyzed. These analysis results can provide a reference for companies concerned about the new energy vehicle industry and segment market.  Related Articles | Metrics

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Equipment characteristics of annealing coating unit for silicon steel used in new energy vehicles in WISDRI (Xinyu) Cold Rolling New Material Technology Co. Ltd. XU Yanbo Electrical Steel    2020, 2 (2): 50-52.   Abstract （166）      PDF（pc） （690KB）（956）       Knowledge map    Save The annealing coating unit for high brand nonoriented silicon steel used in new energy vehicles in WISDRI (Xinyu) Cold Rolling New Material Technology Co. Ltd. was introduced in this paper, especially for the main technological equipments and their characteristics, such as high speed and high efficiency annealing coating unit, cleaning technology of green and energy saving and environmental protection , annealing furnace of high efficiency and energy conservation,  micro tension control technology for high temperature invironment in furnace, and some intelligent manufacturing technologies like intelligent mathematical mode of annealing furnace, intelligent model for predicting magnetic properties of silicon steel. The production practice showed that it can basically realizes the intelligent goal of the whole unit with fewer people, local unmanned and centralized control and monitoring. Related Articles | Metrics

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New technology of annealing coating for electrical steel used in new energy vehicles XU Yanbo, YI Zhengxin Electrical Steel    2021, 3 (3): 43-.   Abstract （182）      PDF（pc） （418KB）（1131）       Knowledge map    Save Based on the product properties and production process requirements of high grade non oriented silicon steel for new energy vehicles, the new technologies of continuous annealing and coating line for electrical steel used in new energy auto in the WISDRI were introduced, such as: thin strip threading and stable operation, efficient cleaning, rapid heating and controlled cooling, uniform coating, intelligent manufacturing. Related Articles | Metrics

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Demand forecast and development suggestion of domesticnonoriented silicon steel in the next 15 years YUE Chongxiang, JIANG Yi, NI Weifeng, WU Shengjie, MA Han Electrical Steel    2021, 3 (5): 37-.   Abstract （288）      PDF（pc） （646KB）（1252）       Knowledge map    Save According to the development trend of domestic nonoriented silicon steel in recent ten years and the future development prospect of downstream industry, the demand of domestic nonoriented silicon steel in the next 15 years is predicted. It is estimated that by 2025, 2030 and 2035, the annual demand of nonoriented silicon steel in China will be 11.25 million tons, 13 million tons and 15 million tons respectively. Among them, the proportion of medium and high grade brands should be increased from 20% to 30%, 40% and 50% respectively. It is the general trend to focus on the development of medium and high grade nonoriented silicon steel. However, in the future, medium and high grade nonoriented silicon steel will face fierce market competition, so we should improve the market competitiveness from two aspects of product quality and cost control. Related Articles | Metrics

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Research and development on high-strength silicon steel application technology of new generation new energy vehicle driving motor#br# LI Yulin, LI Jianwei , TIAN Baozhi, ZHANG Hang, PEI Ruilin Electrical Steel    2021, 3 (6): 8-.   Abstract （188）      PDF（pc） （946KB）（918）       Knowledge map    Save The characteristics of the motors used in electric drive cars and the requirements for silicon steel were described, and the electromagnetic properties and mechanical properties of high yield strength nonoriented silicon steel and traditional nonoriented silicon steel were compared and analyzed by experiment. Through the verification and analysis of the finite element model, the highyieldstrength silicon steel motor can achieve the characteristics of low loss and high mechanical strength at high speed, which can help for the application of soft magnetic materials and the optimization of motor structure to form a closed-loop mode. Related Articles | Metrics

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Electromagnetic characteristics of thin-gauge grain-oriented silicon steel and its application in medium and low frequency power equipments#br# CHENG Ling, MA Guang, HAN Yu, CHEN Xin, HE Chengxu, ZHAO Kaimei, ZHANG Yihang Electrical Steel    2022, 4 (4): 1-.   Abstract （168）      PDF（pc） （1656KB）（665）       Knowledge map    Save According to the application requirements of high-performance grain-oriented (GO) silicon steel for electical equipments such as power frequency energy saving transformer, medium frequency isolation transformer , and low frequency transformer, the electromagnetic characteristics of 0.10-0.27 mm GO steel under different working frequencies were studied by an arbitrary waveform magnetic field excitation measurement system. Compared with 0.10 mm ultrathin GO steel, 0.18 mm high magnetic induction GO steel has lower core loss in the frequency range of 15-400 Hz. The core loss of 0.18 mm sample is not only lower than that of 0.23 mm and 0.27 mm products in the rolling direction (RD), but also has the advantage of minimum loss in the transverse direction (TD). However, for materials with the same thickness, low loss in RD does not mean low loss in TD. The differences of electromagnetic characteristics of silicon steel with different thickness were analyzed, and the results can support the core materials selection of different types of transformer. Finally, the future development trend of thin-gauge GO steel was prospected in terms of the performance requirements of core materials for power frequency, medium frequency and low frequency electical equipments.  Related Articles | Metrics

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Quality evaluation of grain-oriented silicon steels for 220-1 000 kV power transformers CHENG Ling, ZHANG Yanbing, MA Guang, HE Chengxu, HAN Yu, CHEN Yunxiang Electrical Steel    2024, 6 (1): 30-.   Abstract （114）      PDF（pc） （1554KB）（510）       Knowledge map    Save Quality supervision and evaluation were conducted on the grian-oriented (GO) silicon steel used for power transformers/reactors in the 220-1 000 kV substation project newly built and expanded by State Grid Corporation of China from 2020 to 2023. A total of 175 substation projects, 24 transformer manufacturing enterprises, and 3 GO steel production enterprises were involved. Based on the technical conditions and testing method standards of GO steels, over 20 000 pieces of GO steel samples, including 23 grades such as 20QH070, 23QH075, 27QH085, and 30QH100, were randomly inspected. Overall, the failure rate of performance has been decreasing year by year, and the problems in magnetic properties, coating performance, and appearance quality of batch supplied GO steels have been identified. By continuously conducting quality assessments of GO steels, we have provided strong support for strengthening the source control of power transformer quality and helping to build an inherently safe power grid.  Related Articles | Metrics

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Development of power transformer and effect of its energy efficiency upgrading on demand of oriented silicon steel#br# ZHANG Fengquan, WANG Shuize Electrical Steel    2022, 4 (5): 6-.   Abstract （179）      PDF（pc） （872KB）（705）       Knowledge map    Save The performance of oriented silicon steel is the main factor determining the loss of transformer. The implementation of the new energy efficiency grade standard puts forward higher requirements for oriented silicon steel. Combined with the development of transformer and oriented silicon steel, the relationship between transformer loss and the properties of oriented silicon steel were analyzed in this paper, and the demand prediction of oriented silicon steel after the implementation of the new energy efficiency grade standard was put forward. Related Articles | Metrics

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The development and application of top grade grain oriented  electrical steels B18R055 and B20R060 MA Changsong, HU Zhuochao Electrical Steel    2020, 2 (5-6): 1-.   Abstract （357）      PDF（pc） （1408KB）（978）       Knowledge map    Save In recent years, under the background of energy conservation and emission reduction, major countries in the world have issued mandatory high efficiency distribution transformer standards.Our country issued the new standard GB 20052-2013 in 2013, which was updated on May 29th 2020 and will be enforced in 2021. To meet the updated transformer standards and energy efficiency upgrade, it is important to enhance the magnetic properties of core materials. Baosteel had developed new products B18R055 and B20R060 in the fourth intelligent factory of silicon steel, which were successfully used for grade S15 energy efficiency distribution transformers. The typical properties of B20R060 product were two grades higher than the highest grade of international  silicon steel with the same thickness, and the B18R055 product is the lowest iron loss oriented silicon steel in the world. In this paper, the properties and transformer performance of B18R055 and B20R060 are introduced, expecting favorable for material selection of transformer manufacturers. Related Articles | Metrics

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Research on the development change and the demand of electrical steel in China in the new era#br# CHEN Zhuo Electrical Steel    2019, 1 (2): 1-6.   Abstract （183）      PDF（pc） （1657KB）（923）       Knowledge map    Save The manufacturing technologies and the quality of electrical steel were taken as an important symbol to measure the production and the technological level of a country' s steel products. This paper studied the development changes of electrical steel in China, introduced the development course of China' s electrical steel industry from nothing to existence and from weakness to strength, from the aspects of the production capacity, the output, the apparent consumption, the import and export quantity, the production and technology, and so on. Meanwhile the positive policies, the adverse factors, the downstream industries related with electrical steel were analyzed, the demand growth of electrical steel in China was forecast, and some suggestions were put forward. Related Articles | Metrics

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Causes analysis of the surface white stripe defect on grain oriented silicon steel WANG Zirong, YANG Xiuzhi, XIONG Zhiwei, LI Jiangbo, CAI Miao Electrical Steel    2021, 3 (2): 5-10.   Abstract （277）      PDF（pc） （1237KB）（856）       Knowledge map    Save The causes of white stripe defects on the surface of grain oriented silicon steel were analyzed. The surface morphology was observed by threedimensional video microscope, the crosssection morphology of the steel and the surface morphology of the defect area after pickling were observed by field emission scanning electron microscope, and the energy spectrum composition was analyzed by energy spectrum analyzer. The analysis result showed that there was elliptical insulation layer falling off in the white stripe defect, and the magnesium silicate substrate in the defect area was abnormal, of which the thickness was much thicker than the normal area. It indicated that the white stripe defect area had been damaged before coating magnesium oxide. After pickling, the spicules with the main composition of O, Al and Si were found in the defect area of white stripe. It was found that the spicules originated from the refractory used in decarburization annealing furnace. The refractory fiber fell and adhered into the surface of the steel strip during decarburization annealing, and was pressed into the strip surface in the process of secondary rolling, which destroyed the oxide film, and affected the formation of the magnesium silicate substrate, and caused the white strip defect on the surface of the steel production after high temperature annealing. This kind of defect has been eliminated by improving the use method of insulating refractory fiber. Related Articles | Metrics

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Research on properties improvement of silicon steel strips by annealing treatment ZHANG Huangqing, LIU Guoxiang Electrical Steel    2020, 2 (2): 35-38.   Abstract （203）      PDF（pc） （1879KB）（863）       Knowledge map    Save The annealing treatment process of silicon steel strips was introduced in this paper,and the changes of electromagnetic properties of silicon steel strips were analyzed by contracting the testing data before and after annealing. So then the mechanism of the properties improvement of silicon steel strips by annealing were described. Related Articles | Metrics

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Interpretation of GB 18613-2020 "Minimum allowable values of energyefficiency and values of efficiency grades for motors"#br# HUANG Jian Electrical Steel    2021, 3 (1): 33-.   Abstract （808）      PDF（pc） （404KB）（696）       Knowledge map    Save The standard of GB 18613 is an important mandatory national standard in the small and mediumsized motor industry.The development process of the standard was briefly described in this paper, and the changes of the newly issued national standard GB 18613-2020, the impact on the small and mediumsized motor industry and the demand for electrical steel were also introduced.  Related Articles | Metrics

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Application of gas chromatography in maintenance of oil-immersed transformer#br# FAN Long, CHEN Wei, WU Sheng Electrical Steel    2022, 4 (5): 38-.   Abstract （151）      PDF（pc） （603KB）（526）       Knowledge map    Save Gas chromatographic analysis is a common technique to detect oilimmersed transformers in operation. By collecting a small amount of transformer oil samples to analyze the gas composition and content in the oil, it can be judged whether there are faults or hidden dangers in the transformer.The coils and cores of oilimmersed transformers are all installed in transformer boxes and immersed in transformer oils, so it is impossible to observe the hidden trouble of transformer directly. The application of gas chromatography to transformer detection can fully solve this problem. In this paper, the gas chromatography was used in practice, and quickly discovered the hidden trouble of the equipment, which provided an effective means to deal with the hidden trouble of the equipment thoroughly and guarantee the stable operation of the equipment. Related Articles | Metrics

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Reliability analysis of chemical industry shielding pump and the application of electrical steel for shielded motor #br# ZHAO Zhicheng, XIAO Haihang, YAN Ming, LI Guang Electrical Steel    2022, 4 (5): 31-.   Abstract （93）      PDF（pc） （1104KB）（503）       Knowledge map    Save The reliability of chemical industry shielding pump was studied through Failure Mode Effects and Critically Analysis （FMECA） technology in this paper，from the angles of chemical pump’s structure, failure mode and failure cause analysis, failure effect and severe degree, detecting methods, design improvements, the adopted compensation measures analysis and hazard analysis. It is also introduced the requirements of the electrical steel application technology for the shielded motor from the design and manufacture. Related Articles | Metrics

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Brief talk about green transformer ZHANG Xueming Electrical Steel    2022, 4 (6): 29-.   Abstract （147）      PDF（pc） （602KB）（488）       Knowledge map    Save This paper comprehensively analyzed the significance of the development of green transformer, and briefly introduced the advantages of the open threedimensional wound core dry-type transformer green manufactured by Guangdong Open Electric Co.,Ltd., such as three-phase balance, energy saving, material saving, etc., and the necessity of applying three-dimensional wound core transformer to green transformer, hoping to provide effective help for relevant personnel. Related Articles | Metrics

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Effect of stress relieving annealing process on microstructure and magnetic properties of nonoriented silicon steel SHI Aichen, CHEN Dongmei, YAO Haidong, LIU Yujin, CAO Ruifang, LIU Haitao Electrical Steel    2021, 3 (5): 32-.   Abstract （214）      PDF（pc） （1443KB）（795）       Knowledge map    Save Epstein frame samples of the silicon steel of 35SW440 were produced by two stress relieving annealing processes of continuous annealing and well annealing. The comparative investigations were conducted on the relationships between the two stress relieving annealing process and their microstructures, precipitation and magnetic properties. The results showed that after stress relief annealing, the iron loss reduced and the magnetic induction improved. Compared with the well type annealing process, the iron core of the steel produced by continuous annealing process had poor magnetic properties under the condition of high magnetic density due to the obvious surface nitriding phenomenon on the surface of the steel. The surface nitriding was due to the unreasonable design of the protective atmosphere and annealing process, resulting in a large number of fine and dispersed AlN precipitates produced in steel. AlN precipitates affected the movement of domain wall and magnetic moment, resulting in the deterioration of magnetic properties. By contrast, the well annealing process reduced the iron loss of the electrical steel sheet under high magnetic density, and improved properties index of iron core due to the effective control of the surface nitriding in steel.  Related Articles | Metrics