Modeling simulation and analysis of permanent magnet synchronous motor drive

Abstract

Three-phase synchronous motors comprising of electrically excited rotor windings which newlinecarries D.C. current are equipped with armature arising as a result of stator windings. But newlineSuch an arrangement has many disadvantages such as reliability issues, less fault tolerance newlineetc. However, these issues can be addressed by the use of permanent magnets in place oI newlineelectrically excited field winding. This arrangement is of special significance because newlinepermanent magnets have many advantages which include elimination of brushes, slip-rings newlineand rotor copper losses in the field windings thus resulting in higher efficiency and rapidd newlinecooling. So, the search of fault tolerant and more reliable drive systems with higher degrees newlineof freedom are the need of the hour. This chronology can be understood by the fact that, DC newlinemotor drive and induction motor drive have slowly given way to three phase permanent newlinemagnet synchronous motor, which in turm has paved the way for multi-phase permanent newlinesynchronous motor. This present work is a step in this direction, wherein solutions to a newlinemultiphase drive system have been generated without creating the scope for additional risks and at the same time ensuring high performance. This thesis deals with the designing of a closed loop control of six - phase PMSM drive by making use of modern control techniques. The need for generation of such a closed loop system arises due to the fact that, it is a daunting task to observe and simultaneously control huge amount of variables in addition to normal input voltages and currents. But this concept of automation of the control of drive system, needs to be done in terms ofa measurable as well as observable output, because then only the automation can prove its adaptability as well as reliability. The output parameters which have been chosen for this work are speed, torque and six-phase currents.