Frequency drives inspect the rotation and speed of the electric motor to enable the actual demands of the process without loss, providing considerable energy savings. In addition, it reduces the loads on the mains and the mechanical wear on the machines during the starting of the motor NUP 207 ECJ, essentially in the couplings and reduction boxes.
These functionalities can also be performed with simple control methods, for example with valves or by-pass control, controls by on / off systems. However, these methods consume a lot of energy, in addition to the total cost being greater than the alternative with frequency inverters. In addition, there is still the environmental effect, as they increase CO2 emissions in power plants.
In this way the total investment costs with usual control methods are much higher than with frequency inverters. Still, they have several other investment returns on acquiring drivers. For example, the ability to improve the procedure, which gives us improved quality and better production rates, is very complex to achieve with the usual control methods. A possible increase in production capacity usually requires the restructuring of the entire system.