1.
VARIABLE FREQUENCY DRIVE
&
VARIABLE FREQUENCY CONTROL
2.
CONTENTS
• What is a VFD? .
• Purpose of the VFD
• VFD Basics
• Variable Frequency Control
3.
What is a VFD?
– Variable Frequency Drive (VFD)
– A VFD can be used to control both the speed and
torque of a standard induction AC electric motor.
– It varies both the frequency of the AC waveform
being delivered to the motor saving money in
electricity.
– Basic components of a VFD:
• Input section, draws AC electric power from the
utility, Rectifier section, converts the AC into DC
power.
4.
Purpose of the VFD
• VFDs help to limit demand and electrical
consumption of motors by reducing the amount of
energy they consume.
– Standard motors are constant speed and when they
are energized they run at a 100% no matter the load.
– Soft Start
– Only use energy you need
5.
VFD Basics
Block diagram of VFD
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