Variable%20Frequency%20Drive

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Variable Frequency Drive

• Donald Kaulukukui

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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 and amps 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.
• Inverter section, converts DC back into a
  controllable AC waveform.

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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

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Potential Problems

• Improper Circuit Design
• Harmonic Distortion
• Safety
• 3 phase generation
• Microcontroller programming

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Expectations

• Learn pulse width modulation techniques
• Learn application of microcontroller features
• Learn advanced circuit design
• Learn AC motor theory
• Learn energy conservation methods

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Goals

• Single phase 120V 60 Hz AC generation
• Three phase 220V 60 Hz AC generation
• Three phase 220V Variable Frequency AC generation
• Temperature controlled VFD

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