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

If you've ever read any articles on field-oriented control (FOC) of motors, chances are you've seen the following three things before. They're all aspects of three-phase pulse-width modulation (PWM).

  • This phrase:


  • These double-humped waveforms:
  • The hexagon:

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 article is for you.

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