Quantification of Noise Benefits in Torque Control Strategies of SRM Drives.

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Name of the Speaker: Arun Chithrabhanu (EE15D212)
Name of the Guide: Dr. Krishna Vasudevan
Venue: ESB-244 (Seminar Hall)
Date/Time: 12th October 2022, 12.00pm

The switched reluctance motor (SRM) is being actively explored as a viable alternative for permanent magnet-based motors for the use in automotive applications, by virtue of its favourable characteristics such as permanent magnet-free construction, high fault tolerance, ruggedness, low manufacturing cost, etc. However, the very principle of operation of SRM introduces two serious drawbacks in its performance, which are torque ripple and acoustic noise. Torque Sharing Function (TSF) based control is a well-established method for the reduction of torque ripple in Switched Reluctance Motor (SRM) drives. There have not been much investigations carried out in the literature on the noise benefits of TSF based control and on the impact of the commutation angles of TSF definition on the acoustic noise in SRM. In this talk, the advantages of TSF based control in noise reduction of SRM are presented, in detail. A new TSF profile, which is characterized by a slower variation of the radial force and hence reduced vibration on the stator, is proposed. Further, the effects of variation of turn-on and overlap angles of TSF definition on the vibration and torque ripple in a closed loop control are analysed, using

simulations and experimental methods. Based on the analysis and experimental studies, a new strategy for the selection of turn-on and overlap angles of TSF definition has also been developed for achieving reduced acoustic noise, in addition to low torque ripple. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed TSF definition and angle selection strategy in reducing the noise and vibration levels in SRM without compromising the torque ripple benefits.