Direct Torque Control of Permanent-Magnet Synchronous Motor and Comparison of its Performance with Induction Motor
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2013, Vol 6, Issue 10
Abstract
Direct Torque Control (DTC) method for Permanent-Magnet Synchronous (PMS) motor has attracted great deal of attentions thanks to its significant advantages including: eliminating the current controllers, low dependence on motor parameters, further simplicity, and favorable torque response compared to other control techniques such as vector control. Fundamental principles of Direct Torque Control (DTC) for selection of stator voltage vectors directly depend on difference between reference torque vector and reference stator flux linkage and their permanent values. Thus, its objective is to directly control the motor flux and torque using inverter voltage vector. Fundamental theory of this control method is presented in the current paper. The mathematical model for direct torque control of permanent-magnet synchronous motor is extended here. The simulation model is then developed in MATLAB/SIMULINK and the simulation results will be discussed. In the respective simulation, the predetermined reference values of stator flux and torque are compared with the values estimated from motor parameters and their difference are sent to hysteresis comparators. Outputs of flux and torque hysteresis comparators are used for determining the appropriate voltage vector and stator flux space vector. Finally, through comparison of DTC simulation on PMS and induction motors, it is observed that actual flux and torque of PMS motor in this method has by far lower ripples compared to the case of induction motor.
Authors and Affiliations
Reza Shabanian| Science and Research Branch, Islamic Azad University, Tehran, Iran, email: rezashabanian@gmail.com, Soodabeh Soleimani| Science and Research Branch, Islamic Azad University, Tehran, Iran, s.soleimani@srbiau.ac.ir, Babak Mozafari| Science and Research Branch, Islamic Azad University, Tehran, Iran, mozafari_babak@yahoo.com
Keywords
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