On October 20, 2012, the appraisal meeting for the technical results of the "Small Brushless Excitation Synchronous Motor Asynchronous Start and Control System" sponsored by the Science and Technology Department of Hubei Province was successfully held in Wuhan. This achievement is a major breakthrough in the field of "brushless excitation starting and control technology" by Dianyang Electric Co., Ltd., and it is another masterpiece after the introduction of the domestic blank high-voltage variable frequency soft start technology in Beijing in February this year. Fuyang City Appraisal Committee is composed of Academician of Chinese Academy of Engineering, Professor of Huazhong University of Science and Technology, Pan Wei, Director of the Department of Science and Technology of Hubei Province, Li Yuanchu, Professor of Electrical and Electronic Engineering of Hubei University of Technology, Professor Liao Jiaping, Professor of Hubei Electromechanical Research and Design Institute Zhu Yongping and Shanghai Electric Group, Wuhan Iron and Steel Group and other 7 domestic experts in this field. Through the argumentation of the identification materials and the analysis and certification of the relevant data at the starting site, the appraisal committee unanimously agreed that the project has achieved innovative results of independent intellectual property rights and provided a new control scheme for the start-up of large-scale brushless excitation synchronous motors. It successfully replaced foreign products and was the first in China, and its technology has reached the international advanced level. According to experts, the principle of asynchronous start and brushless excitation control system for large synchronous motors is to use the eddy current generated by the induced current of the rotor pole shoe as the starting torque. The motor at this time is equivalent to an asynchronous motor with a rotor as the integral steel plate. The excitation winding does not apply excitation current when starting, and the slip current induced by the excitation winding is de-excited by the thyristor de-excitation circuit carried by itself. When the rotor starts to close to the synchronous speed of 97%, the stator throws full pressure, and when the speed is stable in the sub-synchronous state, the machine is put into excitation and dragged into the synchronous running state. The technology has the advantages of small loop current at start-up, arbitrarily selected power grid voltage drop, simple structure, stable performance, safety and reliability, etc., which can solve the problem of starting large and medium-sized synchronous motors imported, and reduce a large number of users for purchasing imported static Funding for Synchronous Variable Frequency Starters (SFC). The successful development of large synchronous motor induction start and brushless excitation control system provides an economical and reliable starting mode selection scheme for the start of large synchronous motors in China. As the birthplace and leading enterprise of domestic soft start technology, Dianhong Electric has been committed to technological innovation and technological advancement in the field of motor energy control. The technology of "large-scale brushless excitation synchronous motor asynchronous starting and its control system" developed by the company has realized breakthrough innovation in the combination technology of large-scale synchronous motor starting and running, which not only effectively solves the technical problem of large-scale synchronous motor soft start, but also solves the technical problem of large-scale synchronous motor soft start. A good balance between the operation control of the motor after starting. It has broken the situation that domestic large-scale synchronous motors and supporting devices are bundled by well-known foreign companies, which provides safe operation guarantee for domestic users of these products, and also reduces the difficulty of use and the cost of purchase for users. The company's technological breakthrough not only means that the soft-start technology of China's synchronous motor has leapt to a new level, but also further demonstrates its own strength as a leader in China's soft-start field.
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