Random pulse width modulation for performance improvement of brushless DC motor drive

2014 IEEE 2nd International Conference on Electrical Energy Systems (ICEES) Pub Date : 1900-01-01 DOI:10.1109/ICEES.2014.6924160

V. Krishnakumar, V. Kamaraj, S. Jeevananthan

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引用次数: 1

Abstract

Brushless dc (BLDC) motor drives have gained significant attention due to their merits such as high efficiency, high dynamic response, high reliability etc. From the literatures, it is understood that there has been remarkable developments evolved in application of the feedback controllers for both the BLDC motor drive's speed and current loops. The recent investigation and innovations in the pulse width modulation (PWM) methods are not encompassed in BLDC drives. The conventional PWM results mechanical vibration and acoustic noise, and limit the application scope the BLDC drives. This is due to the incapability of deterministic PWM in spreading the harmonic power. This paper presents random pulse width modulation (RPWM) for BLDC motor drive with better harmonic power distribution. The randomness is introduced in carrier wave by toggling between triangular wave (+fc) and its inverted form (-fc). The performance of the proposed RPWM is validated by using MATLAB software and results such as harmonic spread factor (HSF), total harmonic distortion (THD), and acoustic noise spectrum are presented. The comparison of results with the conventional PWM demonstrates the superiority of the proposed PWM.

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改进无刷直流电机驱动性能的随机脉宽调制

无刷直流电动机以其高效率、高动态响应、高可靠性等优点而受到广泛关注。从文献中可以了解到，反馈控制器在无刷直流电机驱动速度回路和电流回路中的应用有了显著的发展。脉冲宽度调制(PWM)方法的最新研究和创新并未包含在无刷直流驱动器中。传统的PWM产生机械振动和噪声，限制了无刷直流驱动器的应用范围。这是由于确定性脉宽调制不能有效地扩展谐波功率。提出了一种具有较好谐波功率分配的无刷直流电机驱动随机脉宽调制(RPWM)方法。通过三角波(+fc)和三角波的反转形式(-fc)之间的切换，在载波中引入随机性。利用MATLAB软件验证了该方法的性能，并给出了谐波扩展因子(HSF)、总谐波失真(THD)和噪声谱等结果。通过与传统PWM的比较，验证了所提PWM的优越性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 IEEE 2nd International Conference on Electrical Energy Systems (ICEES)

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