轧机主传动系统通常由直流电机驱动，其性能好坏直接影响板带材的产量和质量。
The output and quality of metal plate and strip are heavily affected by performance of the main drive system of rolling mill.
轧制力矩过大是轧机主传动系统传动轴断裂的主要原因，传统的电机电流过载保护方式不能真实反映轧机主传动系统扭矩的动力学特性。
The breakdown of transmission shaft in the main drive system is due to too high roll torque. Overpower protection mode of motor current does not reflect the true dynamic character of roll torque.
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