矿井提升机同步电动机直接转矩控制系统

Direct Torque Control System of Mine Hoist Synchronous Motor

目前大容量矿井提升机多采用同步电机拖动。分析了基于交-直-交变频调速系统的它励式同步电动机的直接转矩控制系统的理论;给出适用于四象限运行的开关状态表,以及功率因数为1时的励磁电流控制方法;建立了系统仿真模型。对一个提升周期进行了仿真。仿真结果表明在稳态时功率因数接近于1(0.99),验证了给出的励磁电流的控制方法、四象限开关表的正确性。

At present mine hoists with large capacity usually are drove by synchronous machine. In the paper theory of separate excitation synchronous motor direct torque control system based on AC-DC- AC variable frequency and adjustable speed was analyzed. Switches states table for movement in four quadrants and exciting current control method of unity power factor were given. The system simulation model was established and a hoisting cycle was simulated. The simulation results show that the power factor approaches to 1 （0.99） at stable state, and the exciting current control method and switches table in four quadrants are correct.