Improved PWM-OFF-PWM to Reduce Commutation Torque Ripple of Brushless DC Motor Under Braking Conditions

This paper proposes an improved PWM-OFF-PWM of the brushless DC motor under braking condition which can reduce commutation torque ripple. Compared with other brake modulation methods, PWM-OFF-PWM can restrain non-commutation torque ripple attributed to non-conductive freewheeling, while incapable of...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.204020-204030
Main Authors: Zhou, Qixun, Shu, Jianhua, Cai, Ziwei, Liu, Quanlong, Du, Guanghui
Format: Article
Language:English
Subjects:
Braking
braking operation
Brushless DC motor
Brushless DC motors
Brushless motors
Commutation
commutation torque ripple
D C motors
Electric motors
improved PWM-OFF-PWM
Low speed
Mathematical analysis
Modulation
Pulse duration modulation
Ripples
Stability analysis
Switches
Torque
Torque measurement
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Summary:This paper proposes an improved PWM-OFF-PWM of the brushless DC motor under braking condition which can reduce commutation torque ripple. Compared with other brake modulation methods, PWM-OFF-PWM can restrain non-commutation torque ripple attributed to non-conductive freewheeling, while incapable of suppressing commutation torque ripple at low speeds effectively. Therefore, to solve commutation torque ripple caused by the turn-off time being shorter than turn-on time, an improved PWM-OFF-PWM is proposed in this paper. Moreover, to describe the influence factors of commutation torque ripple, the formulas of the duty cycle of switching tube in the commutation period and that during non-commutation period is derived. We can conclude from mathematical analysis that when duty cycles of outgoing and incoming phases satisfy derived formula, the non-commutation current in commutation interval will be more stable, which can contribute to suppress the commutation torque ripple at low speed under PWM-OFF-PWM mode and to improve the operation stability of BLDCM. The correctness and feasibility of the proposed method can be proved by simulation and experimental results.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.3036724