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研究了因电机频繁起动引起的电机温升和转矩响应问题.提出了一种基于S7-300可编程控制器和ACS800变频器的电动螺旋压力机控制系统方案,采用直接转矩控制调速技术(DSC)同时驱动2台电机运转.软件采用模块化的设计结构,并运用速度规划的方法保证回程位置的准确性.直接转矩控制技术提高了转矩响应,减小了转矩波动,避免了电机起动的峰值电流,有效控制了电机温升,长期运行电机温度不超过91℃.能量控制相对误差不超过2%,回程位置误差在±2 mm以内.满足了电动螺旋压力机长期稳定运行的要求.
The problem of motor temperature rise and torque response caused by frequent starting of the motor was studied.The control system scheme of electric screw press based on S7-300 programmable controller and ACS800 frequency converter was proposed.The speed control technology of direct torque control (DSC) to drive 2 motors at the same time.The software uses a modular design structure and speed planning to ensure the accuracy of the return position.Direct torque control technology to improve the torque response, reducing the torque fluctuations, to avoid The peak current of the motor starting effectively control the motor temperature rise, long-term operation of the motor temperature does not exceed 91 ° C. The relative error of energy control does not exceed 2%, the return error of the position within ± 2 mm to meet the long-term stable operation of electric screw press Request.