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现场测试发现:轧机在轧制过程中由于负载谐波频率与轧机机械传动系统固有频率接近时使得主传动系统发生强烈扭振。该文结合现场参数,通过计算机仿真,得出负载谐波力矩会引发电机转速振荡,而在机电耦合作用下电机转速振荡会激发电机输出相同频率的电磁力矩,当含有与机械系统固有频率相接近频率的谐波力矩和电磁力矩作用在轧机主传动系统两端时,主传动系统将会出现强烈的扭振。仿真结果验证了存在这种振动,为抑振措施提供理论基础。
The field test found that the rolling mill produced strong torsional vibration in the main drive system when the load harmonic frequency was close to the natural frequency of the mill mechanical drive system. According to the field parameters and computer simulation, it can be concluded that the load harmonic torque will cause the motor speed oscillation. However, under the electromechanical coupling, the motor speed oscillation will stimulate the motor to output the electromagnetic torque of the same frequency. When containing the mechanical frequency close to the natural frequency Harmonic torque and electromagnetic moment of frequency acting on both ends of the main drive system of the mill, the main drive system will appear strong torsional vibration. The simulation results verify the existence of such vibration and provide a theoretical basis for the vibration suppression measures.