Deadbeat Direct Torque Control Of Induction Machines Using Self Sensing At Low And Zero Speed

The objective of this research is to develop methodologies for systematic improvements of deadbeat-direct torque and flux control (DB-DTFC) and self-sensing for induction machines (IM) over a wide operating range, including very low speeds and very high speeds. The investigation includes the implementation method for DB-DTFC with reduced computational time, extended low-speed self-sensing with volt-second sensing, extended high-speed operation of DB-DTFC in the flux weakening region with encoder feedback and self-sensing, more accurate torque estimation and torque control with DB-DTFC at low sampling-to-fundamental (S2F) frequency ratios, loss minimization with DB-DTFC over a wide operating range, and loss maximization with DB-DTFC for faster braking. This dissertation focuses on the practical issues of DB-DTFC and lays a foundation for integrating DB-DTFC into a commercial IM drive. Analytical studies and experimental investigations show significant improvements at both low speeds and high speeds of the developed methods compared with the existing control methods.

This book deals with the design and analysis of Direct Torque Control (DTC). It introduces readers to two major applications of electrical machines: speed drive and position control and gives the readers a comprehensive overview of the field of DTC dedicated to AC machines. It includes new DTC approaches with and without control of commutation frequency. It also covers DTC applications using artificial intelligence. The book combines theoretical analysis, simulation, and experimental concepts.To make the content as accessible as possible, the book employs a clear proposal in each chapter, moving from the background, to numerical development, and finally to case studies and illustrations. The book is a wide-ranging reference source for graduate students, researchers, and professors from related fields and it will benefit practicing engineers and experts from the industry.

Permanent magnet synchronous (PMS) motors stand at the forefront of electric motor development due to their energy saving capabilities and performance potential. This book is a timely advancement along that path as the first comprehensive, self-contained, and thoroughly up-to-date book devoted solely to the control of PMS motors.