Topics

Each topic page brings together its articles, learning paths, and interactive figures in one place.

Electrical engineeringMotors, inverter modulation, power stages, and digital controllers. Start with the modulation index, then see why SVPWM produces more output voltage than SPWM from the same DC bus.3 articlesMathMathematical concepts illustrated as pictures: envelopes of chords, trigonometric identities, and more. Some posts include figures you can modify.3 articlesComputerProgramming notes, scripts, and website and server tips gathered while building and running this site.12 articlesMATLAB and SimulinkMATLAB language features, Simulink tricks, and solutions to common issues in daily modeling work.10 articles

Learning paths

Envelopes of chords 2 parts

Draw many chords using one simple rule, and a smooth curve appears. The circle comes first, followed by polygons.

  1. The envelope of chords in a circle, the cardioid, the nephroid, and more line graphs
  2. The envelope of chords in a polygon

PWM and space-vector modulation 2 parts

From the definition of the modulation index to the voltage gain of space-vector PWM.

  1. The modulation index of pulse width modulation (PWM)
  2. Why SVPWM Gives About 15% More Voltage Than SPWM, and Why the Number Changes With Your Definition

Interactive figures

PWM / SVPWM modulation-index calculatorPWM / SVPWM modulation-index calculatorWhy SVPWM Gives About 15% More Voltage Than SPWM, and Why the Number Changes With Your DefinitionInteractive space-vector PWM (SVPWM)Interactive space-vector PWM (SVPWM)Why SVPWM Gives About 15% More Voltage Than SPWM, and Why the Number Changes With Your Definition