Modeling and simulation of direct torque control of brushless DC motor drives

Saidatina Aishah , Mohd Shah (2014) Modeling and simulation of direct torque control of brushless DC motor drives. Project Report. UTeM. (Submitted)

Text MODELING AND SIMULATION OF DIRECT TORQUE CONTROL OF BRUSHLESS DC MOTOR DRIVES 24pages.pdf Download (314kB)

Abstract

Direct Torque Control (DTC) operates in two-phase conduction mode; where only two-phase produce switching at one time while the switching in conventional Torque Hysteresis Controller (THC) method resulted in three-phase. Thus, the significant of study is to prove that the switching frequency in THC is lower than DTC for every speed operating ranges. The problem in THC method is poor torque regulation performance due to the current or torque ripple is not restricted within predefined hysteresis bandwidth. As for DTC, the problem occur when small hysteresis bandwidth produce high switching frequency than THC in order to minimize torque ripple. This research project aims to model and simulate the DTC of BLDC and make comparison between the switching frequency and torque/current control performances produced in DTC and THC of BLDC drive. This simulation is conducted by using Matlab/ Simulink. The first things to look at are the mathematical modeling of BLDC motor. The anatomy of motor is required to understand basic operation of BLDC motor drive. Besides, principle of DTC and theory about THC are also important in order to analyze the performance of DTC and THC. The outcomes resulted from the simulation shows that DTC have better torque regulation due to optimum voltage vector selection but higher switching frequency than THC. As for the conventional THC, it produces poor torque regulation performance and low switching frequency than DTC. It is proved that both THC and DTC have its own advantages and disadvantages.

Actions (login required)

View Item