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

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.

A Flexible Rung Ladder Structured Multilevel Inverter

“…13 and Fig. 14 charter output voltage spectra and inductive load current waveform for asymmetrical configuration. The simulation results evidence that the proposed topology is capable of giving high number of voltage levels with a minimum number of power components [30][31][32].…”

An Investigation on the Performance of Random PWM Controlled Converters

“…III. RANDOM PWM CONTROLLED TWO -LEVEL INVERTERS [46][47][48][49][50][51][52][53][54][55][56][57][58][59] Output current of two-level inverters has a square wave with limited power range. It is rich with harmonics.…”

“…The alternative topology to the VSC is the Current Source Converter (CSC), well suited for medium-voltage industrial applications with voltage waveforms having high quality required. Various authors have also implemented random PWM techniques for multilevel inverter, keeping methodologies adopted for 2-Level [46][47][48][49][50][51][52][53][54][55][56][57][58]. C. Guoqiang, W. Zhihong, Z. Yuan, and Z. Junwei realized Random Space Vector Pulse Width Modulation methods Based on Infineon Tricore TC1767/TC1797 like RSFPWM, RPPPWM, RZDPWM and Hybrid Random PWM is involving various combinations of three listed herewith [59].…”

A proposal of structure and control overcoming conducted electromagnetic interference in a buck converter

“…At this stage, there are two types of implementations: a logic implementation and a digital implementation via specific circuits such as field-programmable gate array (FPGA) and digital signal processing (DSP). In this context, the procedures widely used to produce this type of pseudo-random modulation are mainly focused on the use of a linear feedback shift register (LFSR) [14], a linear congruential generator (LGC) [15], or a chaotic recursive sequence [16], [17].…”