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R dump converter without DC link capacitor for an 8/6 SRM: experimental investigation.

Kavitha P, Umamaheswari B - ScientificWorldJournal (2015)

Bottom Line: Extensive theoretical and experimental investigations are made to bring out the merits and demerits of AC versus DC excitation.It is shown that the constructionally simple SRM can be favorably controlled with simple R dump converter with direct AC excitation without need for DC link capacitor.A 4-phase 8/6 0.5 kW SRM is used for experimentation.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical and Electronics Engineering, Anna University, Chennai, Tamil Nadu 600025, India ; Department of Electronics and Instrumentation Engineering, RMK Engineering College, Kavaraipettai, Tamil Nadu 601206, India.

ABSTRACT
The objective of this paper is to investigate the performance of 8/6 switched reluctance motor (SRM) when excited with sinusoidal voltage. The conventional R dump converter provides DC excitation with the help of capacitor. In this paper the converter used is the modified R dump converter without DC link capacitor providing AC or sinusoidal excitation. Torque ripple and speed ripple are investigated based on hysteresis current control. Constant and sinusoidal current references are considered for comparison in both DC and AC excitation. Extensive theoretical and experimental investigations are made to bring out the merits and demerits of AC versus DC excitation. It is shown that the constructionally simple SRM can be favorably controlled with simple R dump converter with direct AC excitation without need for DC link capacitor. A 4-phase 8/6 0.5 kW SRM is used for experimentation.

No MeSH data available.


Phase currents and developed torque of SRM with 60 V sinusoidal excitation and constant current reference of 0.5 A.
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fig7: Phase currents and developed torque of SRM with 60 V sinusoidal excitation and constant current reference of 0.5 A.

Mentions: Figure 7 shows the phase currents and developed torque waveforms of the modified R dump converter. The current waveform shows dips due to the magnitude variation in the supply voltage. The torque waveforms show less switching and the small peaks are at the zero crossing of the supply. Based on the current profile it may be seen that the DC excitation is having high torque ripple compared with sinusoidal excitation. The torque waveform shows a sharp peak due to which the ripple is higher. However in sinusoidal excitation the torque ripple is less. The smaller peaks are due to the zero crossing of the supply. But the average torque is high for AC excited SRM that can very well be seen in the tabulated values.


R dump converter without DC link capacitor for an 8/6 SRM: experimental investigation.

Kavitha P, Umamaheswari B - ScientificWorldJournal (2015)

Phase currents and developed torque of SRM with 60 V sinusoidal excitation and constant current reference of 0.5 A.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4302381&req=5

fig7: Phase currents and developed torque of SRM with 60 V sinusoidal excitation and constant current reference of 0.5 A.
Mentions: Figure 7 shows the phase currents and developed torque waveforms of the modified R dump converter. The current waveform shows dips due to the magnitude variation in the supply voltage. The torque waveforms show less switching and the small peaks are at the zero crossing of the supply. Based on the current profile it may be seen that the DC excitation is having high torque ripple compared with sinusoidal excitation. The torque waveform shows a sharp peak due to which the ripple is higher. However in sinusoidal excitation the torque ripple is less. The smaller peaks are due to the zero crossing of the supply. But the average torque is high for AC excited SRM that can very well be seen in the tabulated values.

Bottom Line: Extensive theoretical and experimental investigations are made to bring out the merits and demerits of AC versus DC excitation.It is shown that the constructionally simple SRM can be favorably controlled with simple R dump converter with direct AC excitation without need for DC link capacitor.A 4-phase 8/6 0.5 kW SRM is used for experimentation.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical and Electronics Engineering, Anna University, Chennai, Tamil Nadu 600025, India ; Department of Electronics and Instrumentation Engineering, RMK Engineering College, Kavaraipettai, Tamil Nadu 601206, India.

ABSTRACT
The objective of this paper is to investigate the performance of 8/6 switched reluctance motor (SRM) when excited with sinusoidal voltage. The conventional R dump converter provides DC excitation with the help of capacitor. In this paper the converter used is the modified R dump converter without DC link capacitor providing AC or sinusoidal excitation. Torque ripple and speed ripple are investigated based on hysteresis current control. Constant and sinusoidal current references are considered for comparison in both DC and AC excitation. Extensive theoretical and experimental investigations are made to bring out the merits and demerits of AC versus DC excitation. It is shown that the constructionally simple SRM can be favorably controlled with simple R dump converter with direct AC excitation without need for DC link capacitor. A 4-phase 8/6 0.5 kW SRM is used for experimentation.

No MeSH data available.