Spread Spectrum Modulation by Using Asymmetric-Carrier Random PWM

Laszlo Mathe, Florin Lungeanu, Dezso Sera, Peter Omand Rasmussen, John Kim Pedersen

Research output: Contribution to journalJournal articleResearchpeer-review

40 Citations (Scopus)


This paper presents a new fixed carrier frequency random PWM method, where a new type of carrier wave is proposed for modulation. Based on simulations and experimental measurements, it is shown that the spread effect of the discrete components from the motor current spectra and acoustic spectra is very effective and is independent from the modulation index. The flat motor current spectrum generates an acoustical noise close to the white noise, which improves the acoustical performance of the drive. The new carrier wave is easy to implement digitally, without employing any external circuits. The modulation method can be used in both open and closed loop motor control applications.
Original languageEnglish
JournalI E E E Transactions on Industrial Electronics
Issue number10
Pages (from-to)3710-3718
Publication statusPublished - 2012


  • AC motor drives
  • Acoustic noise
  • Modulation
  • Pulsewidth modulated (PWM) power converters

Fingerprint Dive into the research topics of 'Spread Spectrum Modulation by Using Asymmetric-Carrier Random PWM'. Together they form a unique fingerprint.

Cite this