Proceedings Article•
The analysis of evolution and ripple of torque during the phase commutation in brushless dc motor
01 Jan 2003-Vol. 1, pp 202-204
TL;DR: In this article, an analytical study of commutation is presented to show how the torque changes with time during the current commutation course between two phases of the brushless dc motor, the formulas to determine torque ripple due to this commutation are developed, at last the theoretical analysis is illustrated by simulation using computer program.
Abstract: An original analytical study of commutation is presented in this paper, to show how the torque changes with time during the current commutation course between two phases of the brushless dc motor, the formulas to determine torque ripple due to this commutation are developed, at last the theoretical analysis is illustrated by simulation using computer program.
Citations
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TL;DR: In this paper, a novel Direct Torque Control with twelve voltage space vector with overlap angle control has been proposed to strike a balance between torque ripple and losses, which is validated through simulation and experimental results.
8 citations
References
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07 Oct 1990
TL;DR: In this paper, an analytical study concerning the torque undulation due to phase commutation on brushless DC motors is presented, showing that the relative ripple is independent of current, varies with speed, and may reach 50% of the average torque.
Abstract: An original analytical study is developed concerning the torque undulation due to phase commutation on brushless DC motors. The results indicate that the relative ripple is independent of current, varies with speed, and may reach 50% of the average torque. The amplitude of the torque undulation and the duration of the commutation are analyzed, showing how this affects the torque-speed curve of the drive. Simulation and experimental results are presented that validate the theoretical analysis. >
323 citations
01 Oct 1989
TL;DR: In this article, the torque ripple attenuation of permanent magnet synchronous motors caused by EMF harmonics and cogging torque is analyzed. Butler et al. analyzed the effect of attenuation methods such as stator slot skewing, permanent magnet shifting and combinations of the two.
Abstract: The authors study the torque ripple attenuation of permanent magnet synchronous motors caused by EMF harmonics and cogging torque. First, the magnet arc influence upon these variables is analyzed. Next, the impact on the harmonic contents caused by attenuation methods such as stator slot skewing, permanent magnet shifting and combinations of the two are presented. The last method makes it possible, using results of the simplest case (nonskewed slots and aligned magnets), to obtain the waveform of the EMF and cogging torque in more complex cases. The best combinations of the magnet arc and harmonic attenuation methods for minimizing electric torque harmonics and cogging torque are suggested. An analysis of cogging torque sensitivity to errors in the slot skewing angle is discussed. >
60 citations