Spread Spectrum Modulation by Using Asymmetric-Carrier Random PWM

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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

48 Citationer (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.
TidsskriftI E E E Transactions on Industrial Electronics
Udgave nummer10
Sider (fra-til)3710-3718
StatusUdgivet - 2012


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