What is Variable Frequency Drive/Inverter (VFD)?
A variable frequency Drive/Inverter (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage of its power supply. The VFD also has the capacity to control ramp-up and ramp-down of the motor during start or stop, respectively.
Even though the inverter controls the frequency and voltage of power supplied to the motor, it is often refered to this as speed control. The result is an adjustment of motor speed.
There are many reasons why the adjustment of the motor speed is good.
• Save energy and improve system efficiency
• Convert power in hybridization applications
• Match the speed of the drive to the process requirements
• Match the torque or power of a drive to the process requirements
• Improve the working environment
• Lower noise levels, for example from fans and pumps
• Reduce mechanical stress on machines to extend their lifetime
• Shave peak consumption to avoid peak-demand prices and reduce the motor size required
In addition, nowadays inverters integrate networking and diagnostic capabilities to better control performance and increase productivity. Energy savings, intelligent motor control and reduction of peak-current drawn are three great reasons to choose a VFD frequency inverter as the controller in every motor-driven system. The most common uses of a VFD frequency inverters are for control of pumps, fans and compressors. Globally, these applications account for 75% of all drives operating.
Soft starters and contactors are other, less sophisticated types of motor controllers. A soft starter is a solid-state device and provides a gentle ramp-up to full speed during startup of an electric motor.
An across the line contactor is a type of motor controller that applies the full line voltage to an electric motor.
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Key words: Frequency Inverter, Variable frequency drive, Frekvenčni pretvornik, Frekventni pretvarač, Měnič frekvence (dříve také měnič kmitočtu), Frekvenciaváltó, фреквентни претварач, Frequentieregelaar, преобразователь частоты, Falownik, Frekvenčný menič, Frequenzumrichter, Variador de frecuencia, Convertitore di frequenza, Convertisseur de fréquence, Frekvensomformer