Instantaneous Torque Control of Magnetically Suspended Reaction Flywheel

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• 作者：Feng Jian ; ^{fengjian@nudt.edu.cn} ; Liu Kun ; Wei Jingbo
• 关键词：brushless dc motor (BLDCM) ; commutation ; diode freewheeling ; torque ripple
• 刊名：Energy Procedia
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：100
• 期：Complete
• 页码：297-306
• 全文大小：400 K
• 卷排序：100

文摘

With the requirement of spacecraft attitude control accuracy, the reaction flywheel is demanded deliver higher precision torque. To improve the torque-output precision of the magnetically suspended reaction flywheel, a new torque control method is proposed. First, comprehensive analysis of torque ripple of brushless DC motor (BLDC) due to commutation and inactive phase diode freewheeling is presented. Second, in order to eliminate the diode freewheeling of the inactive phase, the modulation PWM_ON_PWM pattern is adopted. Third, compensation methods to attenuate the commutation torque ripple by modulating the switching-in phase during low-speed region and modulating switching-out phase during high-speed region are given. Upon this, calculation method of the commutation time is introduced. Finally, the experimental results show that the proposed methods can eliminate both commutation and non-commutation torque ripple efficiently.