ABSTRACT
This
study investigates the torque ripple performance of brushless DC (BLDC) motor
drive system by integrating bothmodified single-ended primary inductor
converter (SEPIC) and silicon carbide metal–oxide–semiconductor field-effect
transistorbased three-level neutral-point-clamped (NPC) inverter. In BLDC
motor, the high commutation torque ripple is an importantorigin of vibration,
speed ripple and prevents the use of the BLDC motor drive system in
high-performance and high-precisionapplications. For torque ripple reduction,
the modified SEPIC converter is employed at the entrance of the three-level
NPCinverter, which regulates the DC-link voltage according to the motor speed.
Moreover, the three-level NPC inverter is employedas a second-stage converter
to suppress current ripple for further torque ripple reduction. Finally, the
performance of theproposed hybrid converter topology is verified by simulation
and laboratory experimental results.
SOFTWARE:
MATLAB/SIMULINK
BLOCK DIAGRAM:
(a) Proposed converter topology
EXPECTED SIMULATION RESULTS
Fig. 2Phase current and torque waveforms
(a) Phase current and torque waveforms from simulation at 2500
rpm and 0.825 N m, (b) Phase current and torque waveforms from simulation at 2500
rpm and 0.825 N m, (c) Phase
current and torque waveforms from
simulation at 6000 rpm and 0.825 N m, (d) Phase current and torque waveforms from simulation at 6000
rpm and 0.825 N m
CONCLUSION
A novel hybrid circuit topology has
been proposed in this paperwhich is built by a modified SEPIC converter and a
SiC-MOSFETbasedthree-level NPC converter for minimising torque ripple in aBLDC
motor drive system. For efficient reduction of torque ripple,the first stage is
the modified SEPIC converter that lifts the DClinkvoltage to the desired value
based on the motor speedmeasurement. For further torque ripple reduction, the
three-levelNPC inverter is employed as the second-stage converter tosuppress
current ripple. Experimental results show that theproposed hybrid converter
topology can suppress the torque rippleto 14.6% at the speed of 6000 rpm,
commutation torque ripple isreduced substantially and produce smooth torque
waveform thanthe BLDC motor driven by the two-level, three-level NPC,
twolevelinverter with DC-link voltage control, and two-level inverterwith SEPIC
converter and switch selection circuit topologies.
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