Some key features to be satisfied by electric motors catering a wide range of applications are high specific power, lower manufacturing cost, rugged construction, and fault‐tolerant operation. Switched reluctance motor is one such motor technology satisfying all the above requirements and is an emerging competitor to the induction and permanent magnet motors in domestic, industrial and electric vehicle applications. The present‐day research on this motor is moving towards improving efficiency at lower speeds, power density, and the torque density. Certain challenges in achieving the same are (a) minimising the losses, (b) mitigation of torque ripple, noise, and vibration, and (c) material advancements. A review based on the estimation and mitigation techniques of each of these over the past three to four decades has been dealt with in this study. The salient features and results in each section provide a clear understanding of how each of these challenges can be overcome in the aspect of design and control strategies.
A linear switched reluctance motor (LSRM) is designed for electric propulsion application in a Magnetically Levitated (Maglev) train with the base speed of 7.6 m/s and operating at a maximum of 27.8 m/s. In such high‐speed LSRMs, windage loss is one of the key issues of concern. Usually, windage loss accounts for approximately 0.5% below the base speed, 20% above the base speed, and 45% at higher speeds of the total loss of the LSRM. One of the many parameters affecting this windage loss is the stator slot profile. This research work studies about different stator slot structures, thereby aiming to reduce the windage loss through computational fluid dynamics analysis. Furthermore, experimental testing of the LSRM is also done to verify the simulation results.
Background:
Advancements in Power Electronics made a huge breakthrough in the industrial
sector majorly in the development of Switched Reluctance Machines (SRM). The main objective
of this paper is to develop a two Phase H-bridge converter for 250W SRM and compare its
advantages and disadvantages over the other converters.
Methods:
A time based simulation has been carried out to evaluate the performance of the converter
at various loads. Different parameters of the machine and converter are studied and the results are
verified experimentally.
Results:
The obtained test results of the converter performance are found to be in good agreement
with the simulation and the efficiency of the converter is compared with the existing R-Dump topology.
Conclusion:
It is concluded that the proposed H-Bridge converter for a two phase SRM is better
than the R-Dump converter in terms of efficiency and reduced size.
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