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This paper makes a comparison between the inverter and hydraulic coupling by introducing the methods and principles of inverter, analyses the situation of fans and pumps in term of energy saving. We think the inverter control program is matured, its energy saving is obviously. Inverter will be widely used in various power plants.
Variable frequency control inverter is a new electric drive and it has rapid development in twentieth century, mainly used in AC motor speed control. Its technology and performance are better than any other kind of speed control mode (such as: Voltage Step-down speed control, pole changing speed control, slip speed control, internal feedback cascade speed control and hydraulic coupling). The inverter speed control has a great acceptance in broad users as its remarkable energy saving, high-precision speed control, wide adjustment range,faultless power electronics protection, as well as easy implementation of the automatic communication function. Inverter also brings great convenience to user in safe operation, reliable installation, maintenance etc, which makes domestic and foreign enterprises adopt best choice of energy-saving method for motor.
Principle
As we know, the relationships of speed (N), flow(Q), pressure(H) and power(P) is as follows:
Variable frequency control inverter is a new electric drive and it has rapid development in twentieth century, mainly used in AC motor speed control. Its technology and performance are better than any other kind of speed control mode (such as: Voltage Step-down speed control, pole changing speed control, slip speed control, internal feedback cascade speed control and hydraulic coupling). The inverter speed control has a great acceptance in broad users as its remarkable energy saving, high-precision speed control, wide adjustment range,faultless power electronics protection, as well as easy implementation of the automatic communication function. Inverter also brings great convenience to user in safe operation, reliable installation, maintenance etc, which makes domestic and foreign enterprises adopt best choice of energy-saving method for motor.
Principle
As we know, the relationships of speed (N), flow(Q), pressure(H) and power(P) is as follows:
Q1/ Q2=n1/n2From above, if other operating conditions remain unchanged, through reducing motor speed, energy-saving effect is very remarkable. For example, working condition only demands 50% flow, personnel can adjust speed to half of rated. Power consumption is only 12.5% of rated value, that is, theoretically, energy saving rate can reach to 87.5%.
H1/ H2=(n1/n2)2
P1/ P2=(n1/n2)3