Pumps, fans, class load, the frequency can be adjusted to control the motor's power output to achieve energy-saving systems.Pump operating point is determined by the pump head curve and line resistance characteristic curve intersection. P = QH (P power, Q flow, H pressure head) (as A ') 3, the power of the operating point of the area enclosed by the curve.

    The traditional water flow through the valve to adjust. This method is by increasing the pipeline resistance characteristics. Although the regulating valve Q reduced, but H increases, and efficiency. Thus the energy saving effect is very limited.

    Changing the speed that changes the operation of the pump characteristic curve without changing the pipeline resistance properties. Based on the similarity principle, head H to the square of decline, while decreasing power P places cubic relationship (Figure A "point), but also to maintain the original high efficiency, so this method is an effective way to save energy when the flow rate is reduced to the original 80%, the power consumption is only 51% of the original, saving 49% but with the regulating valve, only about 5% of the energy saving.

    Use the inverter can effectively improve the power factor, the data from the table, the use of reactive power reduction after conversion of 21.3%. Meanwhile, the converter with the inlet and outlet of the dual filter device, eliminating the motor starter and electromagnetic interference impact on power. The use of inverter motor speed is adjusted according to the load: load is low, the motor speed governor reduced; load increases, the motor speed increases accordingly. Protect the pump motor will not appear low speed high load conditions, nor will there be higher than the rated current frequency overdrive situation. Motor at low speed, since the current low frequency coil enameled less heat, temperature less conducive to extend the service life of the motor coil. Other mechanical parts as low speed, also help to extend the service life.

    Inverter system with soft start function for pump and motor mechanical connection provides a flexible, gentle, non-jumping course starts and stops, to avoid mechanical shock, you can extend the mechanical connection of motor and pump service life of components.

In summary, fan, pump load conditions, the use of variable frequency motor will produce better economic benefits, while the smoothness of the frequency conversion of the entire fan, water pump system, vibration, noise better inhibition.