Rajashekara, Kaushik2023-05-28August 2022022-08-09Portions of this document appear in: A. K. Singh, R. Raja, T. Sebastian and K. Rajashekara, "A Generalized Theory to Predict the Torque Harmonics in Permanent Magnet Machines," 2021 IEEE Energy Conversion Congress and Exposition (ECCE), 2021, pp. 3711-3715, doi: 10.1109/ECCE47101.2021.9595831; and in: A. K. Singh, R. Raja, T. Sebastian, A. Shrestha, M. Sariful Islam and K. Rajashekara, "A Novel Control Strategy to Mitigate the Parameter Saturation Problems in Synchronous Reluctance Machines," IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society, 2021, pp. 1-6, doi: 10.1109/IECON48115.2021.9589407; and in: A. K. Singh, R. Raja, T. Sebastian and K. Rajashekara, "Torque Ripple Minimization Control Strategy in Synchronous Reluctance Machines," IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society, 2021, pp. 1-6, doi: 10.1109/IECON48115.2021.9589827; and in: A. K. Singh, R. Raja, T. Sebastian and K. Rajashekara, "Torque Ripple Minimization Control Strategy in Synchronous Reluctance Machines," in IEEE Open Journal of Industry Applications, 2022, 10.1109/OJIA.2022.3190905.https://hdl.handle.net/10657/14320This thesis provides an analysis for identifying the sources of torque ripple in electric machines. It includes the effect of conductor distribution in the machine, magnet flux density distribution, current harmonics and non-idealities in position and current sensors. Harmonic orders and magnitudes of torque ripple developed due to various sources are analyzed. A new control strategy considering saturation is proposed for Synchronous Reluctance Machine (SyRM). The strategy considers the change in machine parameters due to saturation to obtain optimal torque. The proposed methodology also considers the effect of computation burden on the microcontroller. This ensures that the method can be implemented in automotive grade microcontroller. This thesis also provides an active torque ripple compensation method for minimizing the output torque ripple of SyRM. The proposed active cancellation method uses current injection either in the q- axis or in the d-axis. The influence of parameter saturation on both methods is analyzed. A strategy is proposed to choose the best method between the two based on the operating point of the machine. A 30 slot 4-pole Synchronous Reluctance machine is built and tested. The theoretical work provided in this thesis is supported by experimental results using the prototype machine.application/pdfengThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).SyRMElectric DrivesOptimal ControlMotor ControlElectric MachinesSynchronous Reluctance MachinesTorque Ripple CancellationTorque RippleMotor Reference Current GenerationMotor DriveParameter ToleranceManufacturing Tolerance2023-05-28Thesisborn digital