Related Experiment Videos
R dump converter without DC link capacitor for an 8/6 SRM: experimental investigation
Pasumalaithevan Kavitha1, Bhaskaran Umamaheswari2
1Department 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.
Thescientificworldjournal
|February 3, 2015
Summary
This study demonstrates that switched reluctance motors (SRMs) perform well with sinusoidal AC excitation using a modified R dump converter. This method avoids a DC link capacitor, simplifying control and construction for SRMs.
Area of Science:
- Electrical Engineering
- Power Electronics
- Motor Drives
Background:
- Switched reluctance motors (SRMs) are known for their simple construction but often require complex control.
- Conventional SRM drives typically use DC excitation via R dump converters with DC link capacitors.
- AC or sinusoidal excitation offers potential advantages in SRM performance and control simplicity.
Purpose of the Study:
- To investigate the performance of an 8/6 switched reluctance motor (SRM) under sinusoidal voltage excitation.
- To compare the performance of AC excitation versus traditional DC excitation for SRMs.
- To evaluate a modified R dump converter for direct AC excitation of SRMs without a DC link capacitor.
Main Methods:
- Utilized a modified R dump converter to provide sinusoidal (AC) excitation to an 8/6 SRM.
- Implemented hysteresis current control for torque ripple and speed ripple analysis.
- Compared constant and sinusoidal current references under both AC and DC excitation conditions.
- Conducted extensive theoretical analysis and experimental validation using a 0.5 kW, 4-phase SRM.
Main Results:
- The modified R dump converter successfully provided AC excitation without a DC link capacitor.
- Sinusoidal AC excitation demonstrated favorable performance characteristics for the SRM.
- Torque and speed ripple were analyzed under different excitation and current control strategies.
Conclusions:
- Direct AC excitation of SRMs using a simple R dump converter is feasible and advantageous.
- Eliminating the DC link capacitor simplifies the drive system for SRMs.
- The constructionally simple SRM can be effectively controlled with direct AC excitation, offering a competitive alternative to DC excitation.