A new method to suppress the commutation torque ripple for BLDC motor based on ZETA converter

2015 ◽  
Author(s):  
Zhen Chen ◽  
Hancheng Zhang ◽  
Xiangdong Liu ◽  
Hengzai Hu ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Torque Ripple ◽  
New Method ◽  
Bldc Motor ◽  
Commutation Torque Ripple

Effect of Additional Harmonics of Driving Current on Torque Ripple and Unbalanced Magnetic Force of the BLDC Motors With Stator and Rotor Eccentricities

2014 ◽  
Author(s):  
S. J. Sung ◽  
G. H. Jang ◽  
K. J. Kang ◽  
J. Y. Song
Keyword(s):  
Magnetic Force ◽  
Torque Ripple ◽  
Bldc Motor ◽  
Cogging Torque ◽  
Driving Current ◽  
Rotor Eccentricity ◽  
Commutation Torque Ripple

This paper investigates the characteristics of the torque ripple and UMF in the BLDC motor with stator and rotor eccentricities due to additional harmonics of the driving current. Torque ripple can be divided into cogging torque due to the interaction between poles and slots, and commutation torque ripple due to driving current. Additional harmonics of driving current affect the characteristics of torque ripple. UMF is not generated in rotational symmetric motors with respect to pole, slot and winding configurations. However, stator and rotor eccentricities of BLDC motors generate additional harmonics on cogging torque and UMF. This research theoretically and numerically investigates the effects of driving current on the torque ripple and UMF of a BLDC motor with rotor and stator eccentricities. It shows that additional harmonics of the driving current, the stator eccentricity, and the rotor eccentricity independently affect the torque ripple. It also shows that additional harmonics of the driving current generate additional harmonics in UMF if BLDC motors have the stator or rotor eccentricities.

Position Sensorless DTC of BLDC Motor Driver Based on Sliding Mode Observer

2013 ◽  
Vol 805-806 ◽  
pp. 954-957
Author(s):  
Song Lin Wang ◽  
Shun Yi Xie
Keyword(s):  
Sliding Mode ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Sliding Mode Observer ◽  
Torque Control ◽  
Current Loop ◽  
Bldc Motor ◽  
Rotor Speed ◽  
Brushless Dc ◽  
Commutation Torque Ripple

Direct torque control (DTC) which replaces the conventional current loop with torque loop can directly control the electromagnetic torque in order to reduce the torque error within the hysteresis bandwidth, and it can attenuated commutation torque ripple and the torque ripple of brushless DC (BLDC) motor with un-ideal back electromotive force (EMF) waveforms. Further, the key issue of feedback torque calculation in torque loop is the estimation of back-EMF in sensorless DTC of BLDC motor. So a sliding mode observer (SMO) is employed to estimate the back-EMF in real time. The torque and rotor speed can be derived from the estimated back-EMF. Simulation results demonstrate the proposed method is valid and effective.

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