Comparative study of control techniques for SRMs
The use of switched reluctance machines (SRMs) is expected to increase in the coming years in automotive applications, due to their compactness, simple design, robustness and inherent fault tolerance. SRM drives have, however, to cope with noise, vibration and harshness (NVH) issues that need to be solved for an extensive use in hybrid or electrical vehicles. Furthermore, energy aspects are also of high importance when considering sustainable development and autonomy of the vehicle.
Different control approaches can be applied at torque (average and instantaneous), current (PWM or hysteresis) or chopping level (soft or hard). The present work consists of investigating different techniques on SRMs, regarding performance, energy consumption, and NVH issues. The influence of working conditions has to be also taken into account: speed, load torque, possibly DC-bus voltage. The influence of drive accessories (fan, pump for water cooling) and of SRM or converter faults may also be investigated. The interaction between the generated vibration and the resonance modes of the machine will be studied. Sound metrics will be used to compare the comfortable character of the sound produced by the machine in the different situations.