New Method to Eliminate Commutation Torque Ripple of Brushless DC Motor With Minimum Commutation Time

Shi, Jian; Li, Tiecai

doi:10.1109/tie.2012.2191756

Cited by 108 publications

(43 citation statements)

References 16 publications

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“…The brushless DC (BLDC) motors have a wide range of applications in industrial and civil areas due to high power density, high efficiency, simple drive, and high reliability [1][2][3][4][5][6]. Electromagnetic torque ripple is an important indicator of motor performance.…”

Section: Introductionmentioning

confidence: 99%

“…Chen et al [2,3,8] adopted three different circuits in front of the inverter to meet the voltage demand of commutation period, so that noncommutation phase current was kept steady and commutation torque ripple was reduced. Shi and Li [4] calculated the duty cycle per phase in a PWM period to keep the same current change rates of incoming and outgoing phases. Advanced commutation can also reduce commutation torque ripple by narrowing the differences of current change rates for incoming and outgoing phases.…”

Section: Introductionmentioning

confidence: 99%

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Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control

Sun³

2018

Journal of Control Science and Engineering

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This paper investigates the relationship between current, back electromotive force (back-EMF), and torque for permanent-magnet brushless DC (PM BLDC) motors under advanced commutation control from the perspective of harmonics. Considering that the phase current is the influencing factor of both torque and torque ripple, this paper firstly analyzes the effects of advanced commutation on phase current and current harmonics. And then, based on the harmonics of the phase current and back-EMF, the torque harmonic expressions are deduced. The expressions reveal the relationship of harmonic order between the torque, phase current, and back-EMF and highlight the different contribution of individual torque harmonic to the total torque ripple. Finally, the proposed harmonic analysis method is verified by the experiments with different speed and load conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control

Sun³

2018

Journal of Control Science and Engineering

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“…In this case, outgoing phase back-emf starts * Correspondence: turker@yildiz.edu.tr decaying at the beginning of the commutation period. However, back-emf signals of incoming and outgoing phases are assumed to be constant during the commutation period in many works [4][5][6][7][8][9] due to the short duration of the commutation period. This assumption allows analytical analysis of the commutation period and commutation torque ripple [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…A detailed analysis of commutation torque ripple is carried out in [8], and three different methods are implemented to eliminate commutation torque ripple after the desired phase current trajectories are obtained. In [4], the modification of PWM signal is performed by dividing a switching period into three segments where each has its own role in eliminating commutation torque ripple. Similarly, Salah et al [7] propose another modified PWM approach in which PWM duties are computed for conduction and commutation periods and for high and low speeds separately.…”

Section: Introductionmentioning

confidence: 99%

A switched current controller with commutation delay compensation for the reduction of commutation torque ripple in BLDCM drives

Türker¹,

Khudhair²

2017

Turk J Elec Eng & Comp Sci

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Abstract:The mathematical model of the equivalent circuit of a brushless DC motor switches during the operation due to commutation. This issue causes a sudden ripple in the output torque, which is called commutation torque ripple.Brushless DC motor drives suffer from commutation torque ripple, affecting the performance of the motor in practical applications. A discrete-time switched controller is proposed to reduce the commutation torque ripple in brushless DC motor drives. The proposed controller is a combination of two distinct controllers designed for two different working regions of brushless DC motors. In addition, the commutation delay is also considered in the controller and a predictive structure is implemented to reduce this effect. The overall control scheme consisted of the switched controller and the commutation delay compensation, showing the originality of this study. The performance of the proposed controller scheme is tested through various comprehensive experiments to illustrate its effectiveness and viability.

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“…However, commutation torque ripple has always been one major factor in preventing BLDCM from achieving high performance. The causes for torque ripple in BLDCM are the imperfection of motor design and manufacture, non-ideal EMF and unequal current sharing between the phases during commutation [7] and [8]. Since torque smoothness is an essential requirement for such high-performance applications, a wide variety of techniques have been proposed by many researchers during the past two decades to minimise the torque ripple [9]-[14].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Implementation of a High Boost Ratio DC-DC Converter for Minimizing Commutation Torque Ripple in Brushless DC Motor

Raja

Geethalakshmi

2016

IJPEDS

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Brushless dc motor still suffers from commutation torque ripple, which primarily depends on transient line current in the commutation interval. In order to control the incoming and outgoing phase currents to change at the same rate during commutation, this paper presents a novel high boost ratio DC-DC circuit topology in the front end of the inverter. With a suitable closed loop control scheme, the proposed high boost ratio DC-DC converter is operated with two different duty ratios one during commutation period and the other during non commutation period. The cause of commutation ripple is analyzed, and the way to adjust the duty ratio for obtaining the desired dc link voltage is introduced in detail. Finally, simulation and experimental results show that, compared with the existing dc-dc converter topologies, the proposed method can obtain the desired voltage much faster and minimize commutation torque ripple more efficiently. Keyword:Brushless INTRODUCTIONBrushless dc motors (BLDCM) possessing simple structure, high power density, high torque/current ratio, robustness, and better dynamics have been widely used in all kinds of areas, such as electric vehicles, robotics, small actuators, industry and automotive electronics [1]- [3]. The performance of such motors has been significantly improved due to the great development of power converters, magnetic performance of magnets, and motion control technology in recent years [4]- [6]. However, commutation torque ripple has always been one major factor in preventing BLDCM from achieving high performance. The causes for torque ripple in BLDCM are the imperfection of motor design and manufacture, non-ideal EMF and unequal current sharing between the phases during commutation [7] and [8]. Since torque smoothness is an essential requirement for such high-performance applications, a wide variety of techniques have been proposed by many researchers during the past two decades to minimise the torque ripple [9]-[14].In recent years, multilevel inverters have gained much attention in the application areas of BLDC motor drives [21]. The problem of imperfection in the motor design is overcome in [13] [3], the inverter is operated in 120 mode for lower speed range of the machine and in 180 mode for higher speed range thereby optimizing the commutation

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New Method to Eliminate Commutation Torque Ripple of Brushless DC Motor With Minimum Commutation Time

Cited by 108 publications

References 16 publications

Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control

Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control

A switched current controller with commutation delay compensation for the reduction of commutation torque ripple in BLDCM drives

Analysis and Implementation of a High Boost Ratio DC-DC Converter for Minimizing Commutation Torque Ripple in Brushless DC Motor

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