ABSTRACT:
This paper
presents a comprehensive analysis on torque ripples of brushless dc motor
drives in conduction region and commutation region. A novel method for reducing
the torque ripple in brushless dc motors with a single current sensor has been
proposed by adding BUCK converter in the front of 3-phase inverter.In such
drives, torque ripple suppression technique is theoretically effective in
commutation region as well as conduction region. Effectiveness and feasibility
of the proposed control method is verified through experiments.
KEYWORDS:
1.
Brushless dc motor
2.
Torque ripple
3.
Conduction region
4.
Commutation region
SOFTWARE:
MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig1.
The new proposed circuit configuration
EXPECTED SIMULATION RESULTS:
Fig.2.
The 2-phase current-waveforms of conventional modulation mode
Fig.3.
The 2-phase current-waveforms of new proposed modulation mode
Fig.4.The
commutation current-waveforms of conventional modulation mode
Fig.5.The
commutation current-waveforms of new proposed modulation mode
CONCLUSION:
In this paper,a new torque ripple
reduction method based on buck converter has been proposed for brushless dc
motor drives using a single dc current sensor. In such control method, the dc-link
current sensor can give correct information corresponding to the motor phase currents
to eliminate torque ripples in conduction region. Meanwhile, torque ripples
have been attenuated effectively during commutation region. Subsequently effectiveness
and feasibility of the proposed control method are verified through
experiments.
REFERENCES:
[1] Joong-Ho Song and Ick Choy,
“Commutation torque ripple reduction in brushless DC motor drives using a
single DC current sensor,”IEEE Trans. on Power Electronics,vol. 19, No.2
,pp.312-319,March 2004.
[2] Byoung-Hee Kang,Choel-Ju
Kim,Hyung-Su Mok and Gyu-Ha Choe, “Analysis of torque ripple in BLDC motor with
commutation time,”Proceedings of IEEE,vol.2,pp.1044-1048, June 2001.
[3] Carlson R,Lajoie-Mazenc M and
Fagundes J.C.d.S, “Analysis of torque ripple due to phase communtation in
brushless DC machines,”IEEE Trans. on Industry Applications,vol.28,no.3,
pp.632-638,May-June 1992.
[4] Luk P.C.K and Lee C.K, “Efficient
modeling for a brushless DC motor drive,”International Conference on
Industrial Electronics,Control and Instrumentation,vol.1,pp.188-191, September
1994.
[5] Lei Hao,Toliyat,H.A, “BLDC motor
full speed range operation including the flux-weakening region,”IEEE-IAS
Annual Meeting,vol.1,pp.618-624, Octorber 2003.
