DSP based Sensorless Control of Permanent Magnet Brushless DC Motor

Abstract

A closed loop speed control scheme for a Permanent Magnet Brushless DC (PMBLDC) motor is implemented using single current sensor without position and speed sensors. The rotor position information is derived from the back emf of the motor and this in turn is used for determining the rotor speed. The various aspects of DSP based closed loop speed control (such as derivation of position, current sensing, speed controller and PWM generation) of the PMBLDC drive system are discussed. The DC link Current is sensed for feedback, which reduces the requirement of current sensor and hence limits the overall cost of the drive system.

Indexing terms:

• PMBLDC
• DC link
• PWM
• Sensorless

Additional information

Notes on contributors

Mukesh Kumar

Mukesh Kumar was born in Hamirpur (HP) in 1966. He did his graduation in Electrical Engineering from LD Engineering College Ahmedabad (Gujarat) in 1986. He joined Electrical Engineering Department of NIT, Kurukshetra (Haryana) as a Lecturer in 1987. Presently, he is working as a Lecturer (Selection Grade) in Electrical Engineering, Department of NIT, Hamirpur, where he joined in 1989. He obtained MTech Degree (Power electronics, Electrical Machines and Drives) from IIT, Delhi in 1995. He is presently pursuing PhD from IIT, Delhi. His main research interests are power electronic, power quality and DSP based control of electric drives. He is a Life member of ISTE.

Bhim Singh

Bhim Singh was born in Rahamapur, UP, India in 1956. He received the BE (Electrical) degree from the University of Roorkee, India in 1977 and MTech and PhD degree both from the Indian Institute of Technology (NT), Delhi, in 1979 and 1983, respectively. In 1983, he joined as a Lecturer, and in 1988 became a Reader in the Department of Electrical Engineering, University of Roorkee. In December 1990, he joined as an Assistant Professor, became an Associate Professor in 1994, and a full Professor in 1997 in the Department of Electrical Engineering, IIT, Delhi. His field of interest includes CAD, power electronics, power quality, flexible ac transmission systems (FACTS), active power filters (APF), static VAR compensation, analysis and DSP based control of electrical machines and drives, energy conservation and renewable energy systems. Dr Singh is a fellow of INAE, IETE and IE(I) and a life member of ISTE, SSI, NIQR and senior member of IEEE (USA).

B P Singh

B P Singh was born in Singhiya, Bihar in 1940. He received the BSc degree in Engineering from Bihar Institute of Technology, Sindri, the ME degree in Electrcal Engineering from Calcutta University and PhD degree from IIT Delhi, in 1963, 1966 and 1974, respectively. He was senior research Fellow at Bengal Engineering College, Howrah during 1963–66, and after serving Muzaffarpur Institute of Technology, Muzaffarpur as a faculty member from 1968 to 1978, he joined the Department of Electrical Engineering IIT Delhi as an Assistant Professor. From 1984 to 2002 he worked as a Professor in the Department of Electrical Engineering NT Delhi. Presently, he is working as an Emeritus Fellow in the same Department. He was a visiting Professorat California State University, Long Beach, during 1988–1990. His research interests include power electronics, CAD and analysis of machines, self excited induction generators, and analysis and digital control of drives. Prof Singh is a fellow of lE(lndia) and a life member of ISTE.