Back-EMF Filtering Method Based on Fractional Fourier Transformation
Xiaodong Yao · Electric Drive · 2010
The accurate rotor position is core of the sensorless brushless DC motor(BLDCM) control.In order to provide a back-electromotive force(EMF) filtering method base on fractional Fourier transformation(FrFT),back-EMF signal was analyzed in detail.The method makes use of filtering performance of FrFT in the time and frequency domain and can filter noise and obtain the zero-cross event accurately and satisfying request of real project.It is well demonstrated from experiment that the proposed control method is provided with desirable reliability and stability.