| Based on the analysis on large power belt conveyor, and according to the specific requirements of belt conveyor, this paper indicates that the frequency converter could be used to realize soft-start procedure and speed adjustment of belt conveyor.The paper focuses on heat emission, speed regulation and balance of power: Firstly, based on basic working theory of frequency converter, the paper develops new method on how to calculate power loss of rectifier and inverter. According to heat problem, the paper chooses the heat pipes, and develops the new design methods. Secondly, speed regulation includes soft-start and energy saving problem. Based on analysis on dynamic mathematical models of belt conveyor, the paper studies the best soft-start method; based on analysis on resistance of belt conveyor, the paper studies energy saving by adjusting speed according to the load. Thirdly, the paper studies reason what causes unbalance of power, and develops the method how to adjust balance of power by frequency converter.According to the above conclusion, the paper studies electric control system of belt conveyor applying with frequency converter, introduces component of system, and studies flow chart of PLC program of soft-start, power saving and balance of power. Also, the paper put forward a fussy control method in order to improve the control precision, which lays a good foundation of the practical apply of high capacity , large power and long distance belt conveyors.
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