Abstract— This paper presents an advanced simulation model of Permanent Magnet Synchronous Motor (PMSM). The vector control scheme of a PMSM drive has been implemented using the developed simulation model. In the developed model, speed and torque as well as the voltages and currents of voltage source inverters components can be effectively monitored and analyzed. The developed simulation model has been implemented using Matlab and the dynamic response of PMSM drive has been analysed for constant speed, varying torque and variable speed constant torque operation. Also, the simulation results have been presented. The simulation results of the developed model has been validated with the circuit simulation using the PMSM block available in the Matlab/Simulink library. Therefore, it can be expected that the developed simulation model can be an easy to design tool for the design and development of PMSM drives for different control algorithms and topological variations with reduced computation time and memory size. Keywords- PMSM; vector control; modeling; closed loop; constant torque angle control; I. INTRODUCTION In recent years, many DC drives were replaced by brushless AC drives. PMSM gained much attention and has become the most used drive in machine tool servos and modern speed control applications. The inherent advantages of the machine include high efficiency, high power factor, high power density, easy maintenance, fast dynamic response. PMSM replaces Induction motor (IM) and Synchronous motor (SM) in several applications due to its higher efficiency, high power density and high torque to inertia ratio [1]. Rotor of PMSM is made up of permanent magnet so there is no need of supplying magnetizing current through stator to produce airgap flux. SM requires dc excitation on the rotor, which is supplied by brushes and slip rings; it leads to rotor losses and requires regular maintenance [2]. In PMSM rapid torque build up required by, variable speed and fast dynamic response drives, could be achieved by stator current control technique. PMSM is a topic of interest for last twenty years. Vector control technique is one of the most common closed loop control technique used in a PMSM drive. Vector control eliminates oscillating flux, torque responses in inverter fed induction motor and synchronous motor drives. This method has further classification, which includes constant torque angle control, Unity power factor control, constant mutual air gap flux-linkages control, optimum-torque-per-ampere control and flux-weakening control. The choice of these methods depends on mainly on the type of application and the load characteristics. Hence, it is always essential to perform a simulation study prior to designing a PMSM drive for choosing the appropriate control algorithm for a particular application. The mathematical model of PMSM as such has been well established in literature [2] and [3]. Incorporation of PMSM model along with the inverter model and load characteristics is essential to represent a complete drive system. Such a simulation model has been reported for a BLDC drive [4]. Also the modeling of complete PMSM drive is reported in [2]. This paper proposes a system simulation model for a complete PMSM drive based on the mathematical model of an inverter fed PMSM implemented using MATLAB\Simulink, which could be used for simulating various control algorithms. In the developed model, speed and torque as well as the voltages and currents of voltage source inverters components can be effectively monitored and analyzed. In this paper, section II discusses about mathematical modeling of PMSM. Section III discusses about the developed simulation model of PMSM drive system. The simulation results of the developed model validated with the circuit simulation model has been presented in section IV. II. MATHEMATICAL MODEL OF PMSM The mathematical model of PMSM available in the existing literature [1] and [5] has been presented in this section to provide a basis for the subsequent sections. The stator of the PMSM and the wound rotor synchronous motor are similar. The permanent magnets used in the PMSM are of a modern rare-earth variety with high resistivity, so induced currents in rotor are negligible. In addition, there is no difference between the back EMF produced by a permanent magnet and that produced by an excited coil. Hence the mathematical model of a PMSM is similar to that of the wound rotor SM. The rotor reference frame is chosen because the position of the rotor magnets determines the instantaneous induced emfs and subsequently the stator currents and torque of the machine independently of the stator voltages and currents. The following assumptions are considered in the derivation. Trichirappalli, India. lenin-eee@saranathan.ac.in Asst. Professor, EEE, Saranathan College of Engineering, S. Lenin Prakash kamalaselvaneee@gmail.com M.E, Power Electronics and Drives Saranathan College of Engineering, Trichirappalli, India. A. Kamalaselvan Modeling Simulation and Analysis of Closed Loop Speed Control of PMSM Drive System 2014 International Conference on Circuit, Power and Computing Technologies [ICCPCT] 692 978-1-4799-2395-3/14/$31.00 ©2014 IEEE