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指出采用同步电机边缘传动的球磨机所存在的问题，介绍低速大扭矩液压马达驱动系统的组成、原理以及在球磨机上的应用。
It points out the problems existing in ball mill driven by synchronous motor and introduces the composition, principle and application of low speed high torque hydraulic motor drive system in ball mill.