IJE TRANSACTIONS B: Applications Vol. 31, No. 2 (February 2018) 307-314   

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S. Gol, G. Ardeshir, M. Zahabi and A. Ale Ahmad
( Received: November 07, 2017 – Accepted in Revised Form: November 30, 2017 )

Abstract    The commutation process causes current ripple to be generated in the drive system of brushless DC (BLDC) motor. This, in turn, leads to output torque ripple. Mechanical vibration and acoustic noise are its influences which are undesirable phenomenon in some applications. A new method is presented in this paper which reduces torque ripple and commutation period in the entire range of motor speed. This method is designed and implemented based on two-segment pulse-width modulation (PWM) and DC-link voltage doubling during commutation. Based on the presented theory and given the influence of DC-link voltage on ripple magnitude, some experiments are carried out in which simultaneous association of the above mentioned factors in reducing current ripple and commutation time in the entire speed range of rotor has been proved. The experimental results show that the current ripple magnitude in high speed range is almost 20 times less than conventional method based on H-PWM_L-ON technique.


Keywords    Brushless DC Motors, motor drive system, commutation torque ripple, pulse-width modulation, DC-link voltage.


چکیده    فرآیند کموتاسیون سبب پیدایش ضربان جریان در سامانه راه­انداز موتور DC بدون جاروبک می­شود. این به نوبه خود منجر به نوسان گشتاور خروجی می­گردد. لرزش مکانیکی و نویز صوتی از آثار آن بوده که در برخی از کاربردها پدیده­ای نامطلوب است. در این مقاله روش جدیدی ارائه می­شود که ضربان گشتاور و مدّت­زمان کموتاسیون را در کل محدوده سرعت موتور کاهش می­دهد. این روش بر اساس مدولاسیون پهنای پالس دو قسمتی و دو برابر نمودن ولتاژ لینک DC در بازه کموتاسیون طراحی و پیاده­سازی شده است. بر مبنای تئوری ارائه شده و با توجه به تاثیر ولتاژ تغذیه بر دامنه ضربان، آزمایشاتی انجام شد که مشارکت دو عامل مذکور بطور همزمان در کاهش ضربان جریان و مدّت­زمان کموتاسیون در محدوده وسیع سرعت روتور اثبات شد. نتایج آزمایشات نشان داده است که دامنه ضربان جریان در محدوده سرعت زیاد تقریباً 20 برابر کمتر از روش متداول مبتنی بر تکنیک H-PWM_L-ON می­باشد


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