New mode and key technology of series drive of multiple permanent magnet motors for scraper conveyor

Intelligent equipment is an inevitable trend for the high-quality development of the coal industry, With the construction of super high mining height and super long working face in coal mine, scraper conveyor has been developing towards heavy and long distance, and permanent magnet direct drive has gradually replaced “asynchronous motor + reducer” to become the main driving mode of scraper conveyor. However, the traditional dual-drive scraper conveyor has the problems of high shutdown rate, uneven distribution of coal flow and large energy consumption, poor tracking performance, especially the fluctuation of the chain tension under long transport distance causes the surge of the driving motor circuit, which has become the main problem that limits the intelligent development of scraper conveyor in our country. According to the main problems and development needs of scraper conveyor, this paper puts forward a new mode of scraper conveyor with multiple permanent magnet motors in series “drive - drive”, and expounds the research status of key technologies involved in the research field of scraper conveyor with multiple permanent magnet motors in series. Including the scraper conveyor fault diagnosis and state recognition technology, multi-motor series drive “mechanical-electrical” coupling dynamic characteristics, multi-permanent magnet motor synchronous control technology, multi-agent adaptive cooperative control, for the design and development of multi-drive scraper conveyor has certain adaptability and reference. In view of the difficulties faced by the research of multiple permanent magnet motor series drive system of scraper conveyor, the system is divided into four key science and technology: ① new configuration design of multi-drive scraper conveyor; ② nonlinear mechano-electrical coupling dynamics modeling of multi-drive scraper conveyor; ③ chain tension pulsation and active control of multi-drive scraper conveyor; ④ active fault tolerance and adaptive cooperative control of series drive scraper conveyor. From the structural design and optimization, the whole machine operation and maintenance control to achieve scraper conveyor multiple permanent magnet motor series drive system technology research, improve the scraper conveyor intelligent level, promote the level and development of high-end equipment of coal machinery.