It reveals merits and faults by comparative analysis several control mode and presents practicalities of the high power motor drive in the power plant.

The paper introduces the design and application of a fixed wearable alloy roller ring to replace a traditional one, and analyses and compares it with foreign similar equipment.

The status and composition of Garlert Coiler are introduced, four kinds of coil transmission device of it compared, the developing trend of large coil analyzed.