Constant Switching Frequency Based Direct Torque Control of Interior Permanent Magnet Synchronous Motors With Reduced Ripples and Fast Torque Dynamics

The conventional direct torque control (DTC) features control structure simplicity, fast dynamic response, and parameter robustness. Nevertheless, it suffers from the problems of variable switching frequency and large torque ripples. This paper presents a modified DTC algorithm for interior permanen...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2016-09, Vol.31 (9), p.6485-6493
Main Authors: Foo, Gilbert Hock Beng, Xinan Zhang
Format: Article
Language:English
Subjects:
Algorithms
constant switching frequency
Constants
Couplings
direct torque control
Dynamic response
Dynamics
Electric currents
Hysteresis
interior permanent magnet synchronous motor
Magnetism
Permanent magnets
Regulators
Ripples
Simulation
Stators
Switching
Switching frequency
Synchronous motors
Torque
Torque control
torque ripples
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Summary:The conventional direct torque control (DTC) features control structure simplicity, fast dynamic response, and parameter robustness. Nevertheless, it suffers from the problems of variable switching frequency and large torque ripples. This paper presents a modified DTC algorithm for interior permanent magnet synchronous motor drives with fast torque dynamics and constant switching frequency. The aforementioned problems are alleviated by adding a PI torque regulator to autonomously alter the effective duty cycle of the applied voltage vector. As a result, a constant switching frequency and also reduced torque ripples are obtained while retaining the benefits of the classical DTC. In addition, the torque dynamic response is further improved by introducing a modified switching table during transient conditions. By incorporating the modified switching table, the torque dynamic response is superior to that of the classical DTC. Simulation and experiment results included confirm the effectiveness of the proposed method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2015.2503292