| MS Seminar

Name of the Speaker: Mr. Asif Khan Kayamkhani (EE22S069)
Guide: Prof. Srirama Srinivas
Venue: ESB-234 (Malaviya Hall)
Date/Time: 29th January 2025 (Wednesday), 2:30 PM
Title: Stator resistance adaptation methods in Sensorless-Direct Torque Control of Synchronous Reluctance Motor

Abstract :

Efficient and reliable control strategies for Synchronous Reluctance Motors (SynRMs) is essential for its adoption in modern industrial and also domestic applications. Direct Torque Control (DTC) is known for its high dynamic performance and simple implementation, stands out as a sophisticated speed control technique. Amongst the various control methods, DTC is sensitive only to the motor stator resistance. Variations in the stator resistance of the motor can impact motor stability posing severe threat to its robustness. The present research work proposes advanced sensorless resistance estimation methodologies that altogether avoid the motor instability issues and contribute to improved performance from the SynRM drive under varying operating conditions.

The first part of the talk presents investigations on the SynRM controlled with traditional DTC under the influence of stator resistance variations and highlights significant deviations in torque and flux performance. To overcome this, a novel sensorless DTC strategy incorporating dynamic resistance adaptation is proposed to mitigate the adverse effects of parameter variations. The envisaged sensorless method altogether overcomes instability issues and also contributes to reduced motor torque ripple. The second part of the talk presents an Maximum Torque per Ampere (MTPA) based DTC method which again dynamically adjusts the stator flux as per the load in order to minimize the current drawn by the SynRM for a given torque demand. Here also, adaptive resistance estimation technique is developed to address instability issues observed in the conventional MTPA-DTC approache under stator resistance variations. This method ensures robust torque and flux control while significantly enhancing energy efficiency. Both the proposed methods discussion are analysed, simulated and experimentally verified. The efficacy and robustness of the system under stator resistance changes under diverse loads and operating conditions are showcased in support of the proposed control methods.