On October 20, 2012, the technical achievement appraisal meeting of "Brushless Excitation Synchronous Motor Asynchronous Start and Its Control System" hosted by Hubei Provincial Department of Science and Technology was successfully held in Wuhan. This achievement is a major breakthrough in the field of “Brushless Excitation Starting and Control Technology†by Dali Xiangyang Co., Ltd., and is another masterpiece after the launch of the domestic high-voltage variable-frequency soft-start technology in Beijing this February.
The members of the Xiangyang City Appraisal Committee are Pan Yuan, an academician of the Chinese Academy of Engineering and a professor of Huazhong University of Science and Technology, Li Yuanchu, director of the Achievement Department of the Hubei Provincial Department of Science and Technology, Liao Jiaping, a Ph.D. Shanghai Electric Group, Wuhan Iron and Steel Group and other 7 domestic well-known experts in this field. Through the argumentation defense of the appraisal materials and the analysis and certification of the relevant data on the starting site, the appraisal committee agreed that the project has achieved independent intellectual property rights innovations and provided a new control scheme for the start of large brushless excitation synchronous motor , Successfully replaced foreign products, the first in China, the technology has reached the international advanced level. According to experts, the principle of the asynchronous start and brushless excitation control system for large synchronous motors is to use the eddy current torque generated by the induced current of the rotor pole shoes as the starting torque. Excitation current is not added to the excitation winding during starting, and the slip current induced by the excitation winding is de-excited through the de-excitation circuit of the thyristor carried by itself. When the rotor starts to be close to 97% of the synchronous speed, the stator throws full pressure, and when the speed is stable in the sub-synchronous state, the excitation is selected and dragged into the synchronous running state.
This technology has many advantages such as small loop current at start, optional voltage drop of the power grid, simple structure, stable performance, safety and reliability, etc. It can solve the problem of starting large and medium-sized synchronous motors imported, reducing a large amount for users to purchase imported static Funding for Synchronous Frequency Starter (SFC). The successful development of induction start and brushless excitation control system for large synchronous motors provides an economical and reliable starting method selection scheme for the start of large synchronous motors in China.
Dali work is the birthplace and leading enterprise of domestic soft start technology, and has been committed to technological innovation and technological progress in the field of motor energy-saving control. The "Brushless Excitation Synchronous Motor Asynchronous Start and Control System" technology developed by the company has achieved a breakthrough innovation in the combination of starting and running technologies for large synchronous motors, which has effectively solved the technical problems of large synchronous motor soft start It takes into account the operation control of the motor after starting. It breaks the situation that domestic large-scale synchronous motors and supporting devices are bundled and sold by well-known foreign companies, which provides safe operation guarantee for domestic users of these products, and also reduces the difficulty of use and purchase costs for users. The company's scientific and technological breakthrough not only means that China's synchronous motor soft start technology has jumped to a new level, but also further shows its own strong strength as a leader in China's soft start field.
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