What PWM Analysis Is

This section helps you to understand PWM analysis, a method to study the noise emitted by Pulse Width Modulation in electrical machines.

PWM noise is an electromagnetic noise which creates excitations in "V-shape" centered at a constant frequency (and its multiples). These excitations are created mainly by Pulse Width Modulation (PWM) current harmonics combined with fundamental rotor and stator fields.

PWM noise exhibits positive and negative harmonic tones around the center frequency (for instance: center frequency = 10 kHz on the figure above).