Dynamic commutation torque-ripple reduction for brushless DC motor based on quasi-Z-source net

The commutation torque ripple in the six-step square-wave driving mode of the brushless DC motor affects the motor performance and generates mechanical vibrations and noise when used for industrial applications. The cause of commutation torque ripple is analysed in this study and a non-linear transi...

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Bibliographic Details
Published in:IET electric power applications 2016-11, Vol.10 (9), p.819-826
Main Authors: Xia, Kun, Lu, Jing, Bi, Chao, Tan, Yuan, Dong, Bin
Format: Article
Language:English
Subjects:
brushless DC motor
brushless DC motors
Commutation
commutation interval
commutation voltage
constant torque
constant‐voltage power supply
control system
Control systems
current sampling
Direct current
dynamic commutation torque‐ripple reduction
Dynamics
Electric motors
industrial application
machine control
mechanical vibration
modulated chopping method
motor speed
nonlinear transient model
phase current
quasi‐Z‐source net
Reduction
Ripples
sampling methods
six‐step square‐wave driving mode
speed‐adjustable range
Torque
torque transducer
transducers
transient analysis
transient‐current model
vibrations
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Summary:The commutation torque ripple in the six-step square-wave driving mode of the brushless DC motor affects the motor performance and generates mechanical vibrations and noise when used for industrial applications. The cause of commutation torque ripple is analysed in this study and a non-linear transient model of the phase current during the commutation interval is developed. According to the transient-current model, the commutation voltage and the time required to produce a constant torque can be calculated without current sampling; this makes the control system easier to realise in industrial applications, and reduces the need for a high performance controller. Based on the pulse-with modulated chopping method and quasi-Z-source net, the proposed control system can adjust the motor speed using a constant-voltage power supply and reduce the commutation torque ripple over the entire speed-adjustable range. A torque transducer is used to measure the dynamic torque ripple in the experiment. The results show that the proposed commutation torque-ripple reduction strategy can reduce the dynamic torque ripple by about 70% in both simulation and experiment compared with the traditional driving methods.
ISSN:1751-8660
1751-8679
1751-8679
DOI:10.1049/iet-epa.2016.0219