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摘 要 近年来，随着国民经济的发展，特别是大型高产高效矿井的开发，矿井规模大型化，胶带输送机长运距、大运量、大功率、多电机多点驱动是发展趋势。要求胶带输送机多台电机同步软启动、软停止，实现调速运行、低速验带和速度一致性功能，同时实现各驱动电机功率平衡及转矩平衡控制，使胶带输送机各点张力均匀一致并控制在规定范围内。当前国内外胶带输送机技术发展迅速，动态分析技术、可控软启动技术、自动张紧技术、多点驱动技术、电控自动化技术及转矩平衡技术等得到广泛应用。 本文以哈密大南湖煤矿主斜井胶带输送机设计为背景，通过比较高压变频、调速型液力偶合器、CST装置、液粘装置等多种软启动的方式，从驱动性能、可靠性、功率平衡、转矩平衡、调速精度等方面分析，多驱高压变频技术以其先进性及稳定可靠性，被优先选择应用。 本文通过分析交流异步电动机调速原理、直接转矩控制系统的原理和特点、直接转矩控制系统和矢量控制系统性能比较。选用东芝三菱10KV高压变频器，采用主从控制技术、“转矩环”和“速度环”双环控制模式及直接转矩控制技术。可以确保各台电机转矩平衡；实现各驱动处线速度一致；可降低带强及驱动功率，大幅度节约投资，每年可节省电费约1400*4*5280*1*15%=443万元；可实现软启软停、任意调速；可任意组合实现多驱动，使设备安全稳定运行。从而，解决了大型胶带输送机多电机驱动技术难题。因此，高压变频多驱动转矩平衡技术成为众多胶带运输机的最佳选择。 关键词：矿井运输 多驱动直接转矩控制 高压变频软驱动 Abstract In recent years, with the development of the national economy, especially the development of large-scale high-yield and efficient mine, it is the trend that large-scale mine with belt conveyor that long distance, large capacity, high-power, and multi-point driving using multi-motor. In order to guarantee the coordination of the performance of all the multi-motor, such as speed, tension to the belt and so on, soft-start and soft-stop synchronization of the multi-motor are required. The belt conveyor develop rapidly at present, Such as the dynamic analysis techniques, controlled soft-start technology, automatic tensioning technology, multi-drive technology and electronic control automation technology. On the basis of main inclined shaft belt conveyor in Hami Dananhu coal mine, the soft-start types, such as the high-voltage variable frequency, variable speed hydraulic coupling, CST device, hydro-viscous transmission and so on, are compard. The driving performance, reliability, balance of power, torque balance, speed accuracy are analysed. The multi-axis driving and high voltage frequency converter technology is selected preferentially, because of its advanced and reliability. Through research, some conclusions has achieved. The AC induction motor speed control principle, the principles and characteristics of th