Power & Control 2 - 2 2 Signal Processing , Communications & Networks 3 - 6 3 Microelectronics , VLSI & Display Technology 7 - 8 4 RF Microwaves & Photonics 9 - 10

After much research and developments in the fields of magnetic materials their application to electric motor drives has increased to a significant extent. AC motors with permanent magnet rotors are available as brushless DC motors (BLDCM) for both domestic and industrial applications. With the advancements in power electronics, the control of Brushless DC machine has become more flexible for variety of applications. Thus BLDCMs are penetrating the market of home appliances and automotive applications in recent years because of their compact size, simple construction, higher power density, high efficiency, good heat dissipation, reliability, good over loading capability, silent operation and low maintenance. The present work is aimed at modeling, simulation, closed-loop speed control, and torque ripple reduction of BLDCM drive for possible applications in aerospace, wind turbines, hybrid/electric vehicles, lifts, hoists, cranes, winders and reels. The response of the drive to step change in speed and torque, and speed and torque reversals is studied. It is observed that the drive performance is satisfactory both under transient and steady-state conditions. One of the main disadvantages of BLDCM drive is high torque ripples when compared with inverter fed induction motor drives. In the present work, a torque ripple reduction method is proposed, which minimizes the torque ripple of BLDCM drive. A PC based closed-loop speed control of BLDCM with torque ripple reduction is implemented, and it is tested under no-load and loaded conditions. The performance of the drive is found satisfactory. Both simulation and experimental results obtained from with and without the torque ripple reduction technique are compared For more details click here Back