Review on Numerical Investigation and Optimization of Switched Reluctance Machine with Geometrical Parameters using Ansys

Due to SRM’s robust construction, high operation reliability, high efficiency, high torque to inertia ratio, and low manufacturing costs, they have been attracting substantial attention over the last two decades. Their simple brushless structure and the absence of commutators can be considered as the principal advantage that leads to their stable operation. Since SRMs have no winding or permanent magnet on the rotor, the rotor losses are low, and as such they require no rotor cooling. Switched reluctance motors (SRMs) are used in numerous applications due to their simple and robust structure. In addition to being mechanically and thermally robust, features such as high torque density, efficiency, and reliability, coupled with their fault tolerant structure and low manufacturing cost make SRMs quite attractive. Although SRMs have many features and advantages, large torque ripple, vibration, and acoustic noise are the major disadvantages of these machines. The vibration and acoustic noise of SRMs are mainly generated by the radial forces. The radial forces cause deformation on the stator yoke, which results in vibrations and consequently, frame deformation. When these vibrations resonate with the motor body’s natural frequencies, the amplitude of the oscillations and the deformations are intensified. Hence, the acoustic noise increases significantly. The vibration and acoustic noise of SRMs have been deeply investigated throughout the years, and various methods are reported based on modifications on the motor structure and motor control for reducing them. In this thesis, a new vibration and acoustic noise mitigation method is proposed. This method combines the radial force reduction and damping improvement on the stator. The radial force is reduced by introducing rectangular windows on the rotor and the stator poles, which result in a reduction on the stator deformation.