Introduction

Three-Phase Pulse-Width Modulation, Space Vector Modulation, Zero-Sequence Voltage, and That Darned Hexagon

If you have ever read any articles on Field-Oriented Control (FOC) of motors, chances are you've seen the following three things before. They are all aspects of three-phase Pulse-Width Modulation (PWM).

  • This phrase:
    • SPACE VECTOR MODULATION (SVM)
  • These double-humped waveforms:
zsmwaveform1.png
  • This hexagon:
svmhexagon.png

Unfortunately, many articles on FOC and three-phase PWM rush through an explanation of these basic concepts, and some even present incorrect or misleading information. If you want to improve your understanding of three-phase PWM, this class is for you.

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