Variable Frequency Drives (3)

3. Basic Drive System

The AFD consists of several basic components:

  • Line Voltage – In this case 3-phase AC voltage.
  • Input Section – Consists of a rectifier and filter. Transforms the AC voltage into DC voltage.
  • Control Section – The control board accepts real world inputs and performs the required operations. The tasks are performed by a microprocessor.
  • Output Section – This section includes the base drive circuits and the inverter. The base drive signals are low level signals that tell the inverter to turn on.
  • Motor – Already described.


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