Mechanical and electro-mechanical systems are used extensively in automobiles, in the alternator, starter, heating and air conditioning system (HVAC), anti-lock braking system, power steering and accessories, including windows and door locks. The shortcomings of electro-mechanical systems can be mitigated by replacing as much of the mechanics as possible with electronics. Moreso, electronics also allow for advanced functionality not possible using mechanics. Recent advances in power electronics and motor drives systems have facilitated a migration away from traditional electro-mechanical systems towards systems with a higher degree of electronics; for example, many hydraulic systems for automotive and aerospace applications are being replaced with motor-driven actuators. Momentum in the development of power electronics and motor drives is growing and will continue to grow in the future leading to vast reductions in the weight, size, and cost of motor drive systems.

    The power electronics and motor controls research at The University of Akron is focused on low-cost and rugged alternative drive systems using induction, permanent magnet or switched reluctance machines for various applications. Switched reluctance motors (SRMs) show great potential in a variety of applications. The SRM is simple in construction with only stationary, concentrated windings. Fault tolerance and wide-speed-range operation capability of SRM provide a unique opportunity for using SRMs in conventional automotive and traction applications. However, there are a few fundamental problems that are preventing SRMs from getting widespread acceptance in the industries. The limitations of SRM drives are the rotor position sensing requirements and the higher torque ripple compared to other machines. Higher acoustic noise is also as a major disadvantage for SRMs. The research on SRM drives is focused on the control aspects and design issues to alleviate the fundamental problems. Extensive computer simulation tools based on analytical models have been developed. The models are used for acoustic noise prediction, design optimization, controller development and performance evaluation. The experimental results to validate the models and the control innovations for an automotive electromechanical brake system will be presented.