An introduction to variable frequency drive motor control technology and VFD power flow theory explained.
What you will learn
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The purpose of variable frequency drive (VFD) motor control.
List the two main sections of a VFD and list the subsections within these sections.
Describe the various control functions of a modern VFD.
List VFD input and output (I/O) signal types, analog and digital.
Describe how a VFD multifunction input and output works and how these functions are assigned.
Describe the power flow from the AC line supply to the motor in a modern VFD.
Name each electronic power component in a modern VFD.
Explain how energy is returned from the motor and how the DC link section or bus deals with this energy.
Understand important terms such as carrier frequency, switching frequency, pulse width modulation (PWM), volts per hertz or scalar control and dc injection.
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