Sensorless control of DC Brushless Motors

Speaker: Mahmood Nagrial

Affiliation: University of Western Sydney

Time: Monday 10/11/2014 from 14:00 to 15:00

Venue: Access Grid UWS. Presented from Penrith (Y239), accessible from Parramatta (EB.1.32) and Campbelltown (26.1.50).

Abstract: BRUSHLESS dc motors (BLDCM) have become attractive for industrial applications and home appliances. Such motors have superior characteristics such as high efficiency, compact size, linear characteristics, and compatibility to run at high speeds and high torque to inertia ratio. These motors have higher power density and high efficiency compared with induction motors and conventional DC motors. A BLDC motor requires an inverter and a rotor position sensor to perform commutation. The BLDCM operation is dependent on the rotor position identified by physical sensors such as Hall Effect (HE) sensors, encoders or resolvers. Physical sensors increase the size of the motor, the cost, complexity and reliability. These limitations of using sensors have necessitated the development of sensorless control techniques. The seminar will focus on review of various sensorless control techniques. A new approach for sensorless control of brushless dc motors (BLDCM) using virtual back emf mapping projection will be presented.

Biography:

Dr M. Nagrial obtained his Ph.D. from the University of Leeds, UK. Dr Nagrial has extensive experience in Power Electronics and Drive Systems, Renewable Energy Systems. He is Group Leader of Research Group "Intelligent & Sustainable Electrical Systems". He has conducted many short courses and contributed refereed papers to many International conferences. Dr Nagrial has been a leading researcher in the area of permanent magnet & variable reluctance machines & drive systems. He has supervised Ph.D. and M.Eng. (Hons) Research Theses and postdoctoral fellows in this general area. Dr Nagrial has also worked as Principal Research Scientist at CSIRO, where he has been responsible for developing new devices using rare-earth magnets. Dr Nagrial is a Fellow of IET (UK) and IE (Aust) and Senior Member IEEE(USA).

Research Interests of Speaker: Permanent magnets and their applications, Electrical Drives, Variable reluctance Drives, PM Machines & Drive Systems, Renewable Energy Sources, Power Electronics, EMC/EMI, Neuro-Fuzzy Control, Power Systems, Intelligent Control, Micro-Electromechanical Systems