Commutation Torque Ripple Reduction Strategy of Z-Source Inverter Fed Brushless DC Motor

Based on the Z-source inverter, this paper proposes a novel commutation torque ripple reduction strategy for brushless DC motor (BLDCM). The proposed strategy employs the same modulation mode in both the normal conduction period and the commutation period, and the commutation torque ripple is reduce...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2016-11, Vol.31 (11), p.7677-7690
Main Authors: Li, Xinmin, Xia, Changliang, Cao, Yanfei, Chen, Wei, Shi, Tingna
Format: Article
Language:English
Subjects:
Bridge circuits
Brushless DC motor
Commutation
Commutation torque ripple
Comparative analysis
Electric currents
Electric potential
End point detection of commutation
Inverters
Mathematical analysis
Pulse width modulation
Ripples
Signal to noise ratio
Strategy
Switches
Torque
Vector space
Vectors (mathematics)
Voltage
Z-Source inverter
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Summary:Based on the Z-source inverter, this paper proposes a novel commutation torque ripple reduction strategy for brushless DC motor (BLDCM). The proposed strategy employs the same modulation mode in both the normal conduction period and the commutation period, and the commutation torque ripple is reduced by regulating the shoot-through vector and active vector duty cycles. The proposed detection method acquires the end point of commutation by comparing the clamped terminal voltages with reference zero level, and the signal-noise-ratio of the detection is improved by avoiding the attenuation of the terminal voltages. Furthermore, a certain pulse width of the shoot-through vector can not only reduce the commutation torque ripple but also provide a new opportunity to detect the end point of commutation. Moreover, Z-source inverter provides the buck-boost ability for BLDCM drive system, then the dc voltage utilization can be improved, and the safety of the drive system can also be improved. In addition, this paper analyzes the terminal voltages during each vector. The experimental results verify the correctness of the theories and the effectiveness of the proposed approach.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2550489