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the high power excitation tuned Rheostat is used to adjust the clutch current. The advantages of this structure are simple configuration, electromagnetic coupling between the output end of the clutch and the motor can absorb and buffer the load of sudden change, and the Eddy current drive device made of this characteristic curve is used for material conveying equipment, be Popular with users. Speed feedback is usually provided by an AC tachogenerator. At the low speed end, the speed adjustment factor is extremely poor. Although the manufacturer has established a speed range of 34:1, it is difficult to provide effective torque if these actuators operate at speeds below 20 rpm. In addition, the controller is usually analog electronic technology, vulnerable to temperature changes, poor reliability. The selected frequency converter is a phase-shift multiplex medium-voltage frequency converter, the main circuit has not had the breakdown, its reliability is quite satisfied. Although there was a jump during operation, it was caused by the loss of power on the outside line. There have been several failures in the control loop due to high humidity. The measures to be taken are to install dehumidification equipment in the inverter room and to strengthen the maintenance of the equipment in peacetime. Compared with non-energy-saving products, the energy-saving products used in the perbance of reducing consumption. Multi-function control valve use site. The comparison of energy consumption before and after energy saving is mainly explained from two aspects, independent energy saving equipment, such as catalytic flue gas turbine energy saving 12000kW, saving more than 70 million yuan per year. The energy consumption of the equipment after energy-saving transbation is compared with that before the transbation. In 2010, the operating beters, design values and actual operating beters of the pump, air-cooling,