Title :
A chirp PWM scheme for brushless DC motor drives
Author :
Uddin, Wasi ; Husain, Tausif ; Mitra, Rakesh ; Ofori, Ernest ; Sozer, Yilmaz ; Husain, Iqbal
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Akron, Akron, OH, USA
Abstract :
A novel chirp pulse width modulation (CPWM) scheme is proposed to improve the performance of AC motor drives by reducing electromagnetic interference. The proposed CPWM is operated on the chirped waveform that has a specified bandwidth defined within a minimum and a maximum switching frequency. The design procedure of CPWM that includes selecting the chirp bandwidth and the PWM frequency sweeping time period is presented and analyzed. Then the theoretical analysis is done for both the chirped and non-chirped waveforms. Optimum EMI reduction scheme is developed from the theory. The computer simulation and experimental results verify that the proposed CPWM method has better performance in comparison to PWM with fixed frequency.
Keywords :
AC motor drives; brushless DC motors; electromagnetic interference; interference suppression; pulse width modulation; AC motor drives; PWM frequency sweeping time period; brushless DC motor drives; chirp PWM scheme; chirp bandwidth; chirp pulse width modulation scheme; chirped waveforms; electromagnetic interference reduction; fixed frequency; maximum switching frequency; minimum switching frequency; nonchirped waveforms; optimum EMI reduction scheme; Bandwidth; Chirp; Electromagnetic interference; Pulse width modulation; Switches; Switching frequency; Time frequency analysis; Brushless DC drives; Chirp pulse width modulation (CPWM); electromagnetic interference (EMI); frequency dithering;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2012 IEEE
Conference_Location :
Raleigh, NC
Print_ISBN :
978-1-4673-0802-1
Electronic_ISBN :
978-1-4673-0801-4
DOI :
10.1109/ECCE.2012.6342336
