• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2021, Volume: 15, Issue: 2, Pages: 54-61

Original Article

Comparative Analysis of Conventional (CDTC) and Torque Controller Output Manipulated Stator Flux Angle Based Direct Torque Control (TCSF-DTC) of Permanent Magnet Synchronous Motor (PMSM)

Received Date:10 December 2021, Accepted Date:26 December 2021, Published Date:23 January 2021


Objective: It is recommended to use DTC when a quick response time is required. However, the ripple in torque, as well as flux, is the biggest drawback of DTC. This study presents a comparative analysis of two direct torque control methods CDTC and TCSF-DTC for PMSM’s that operate at a constant speed. Method: Matlab 2021b is used to model both CDTC and TCSF-DTC including all switching signals generation. During the simulation, the switching state is chosen to achieve a fast torque and flux response. Finding: A comparison of the two methods was made based on the results of the simulation. In comparison to CDTC, TCSF-DTC uses double-tracking control to manipulate flux values, which minimizes flux ripples. Although the torque performance is similar in both cases, TCSF-DTC has better flux ripple minimization. In both cases, the torque ripple is 2.857%, whereas the flux ripple is 1.879% and 0.1% for CDTC and TCSF-DTC respectively Furthermore, the simulation result for the supply voltage of the motor illustrates improvements in the harmonic distortion and fundamental component magnitudes. Novelty: Flux and torque are controlled independently in DTC, but a PI controller is added for TCSF-DTC. This study compares the performance of CDTC and TCSF-DTC for flux and torque ripple at a constant speed to recommend the control scheme that is suitable for fine torque and flux ripple control. It has been raised in several works that DTC ripples can be reduced, and researchers have recommended several DTC algorithms, including model-predictive DTC, space vector pulse width modulated DTC, and duty ratio optimization. As a result of adding this feature, computational complexity increases. In particular, duty ratio optimization increases computation complexity for slope estimation. The main advantage of this scheme is that it does not increase the complexity of signal processing but it is effective in minimizing flux ripple.

Keywords: Direct torque; flux angle; flux ripple; permanent magnet synchronous motor; torque ripple


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© 2022 Lemma & Pradabane. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Published By Indian Society for Education and Environment (iSee)


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