scholarly journals Direct Torque Control of Induction Motors using Speed Estimator

2021 ◽  
Vol 9 (6) ◽  
pp. 623-626
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Motor Drive ◽  
Switching Frequency ◽  
Induction Motor Drive ◽  
Computational Calculations ◽  
Speed Estimator ◽  
Vector Modulation ◽  
Hysteresis Control

A new approach to Direct torque control of induction motor is presented in this paper.A ripple in torque of the induction motor is a very common problem and it is to bereduced. In conventionalDTCmethodstheinverter has constant switching frequency and is dramatically increased. In proposed DTC based induction motor drive, an improved space vector modulation technique is applied to inverter control, therefore reducingthe torque/speed ripples. As the proposed approach does not include any dead beat control or hysteresis control, it automatically reduces computational calculations. Simulation results of proposed DTC based induction motor drive technique is validated using MATLAB/SIMULINK environment

scholarly journals Direct Torque Control for Three-Level Neutral Point Clamped Inverter-Fed Induction Motor Drive

2012 ◽  
Vol 2 (2) ◽  
pp. 201-208 ◽  
Author(s):  
M. K. Sahu ◽  
A. K. Panda ◽  
B. P. Panigrahi
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Neutral Point ◽  
Torque Control ◽  
Control Technique ◽  
Motor Drive ◽  
Switching Frequency ◽  
Induction Motor Drive ◽  
Space Vector

Direct torque control (DTC) is a control technique in AC drive systems to obtain high performance torque control. The classical DTC drive contains a pair of hysteresis comparators and suffers from variable switching frequency and high torque ripple. These problems can be solved by using space vector depending on the reference torque and flux. In this paper the space vector modulation technique is applied to the three-level Neutral Point Clamped (NPC) inverter control in the proposed DTC-based induction motor drive system, resulting to a significant reduce of torque ripple. Three-level neutral point clamped inverters have been widely used in medium voltage applications. This type of inverters have several advantages over standard two-level VSI, such as greater number of levels in the output voltage waveforms, less harmonic distortion in voltage and current waveforms and lower switching frequencies. This paper emphasizes the derivation of switching states using the Space Vector Pulse Width Modulation (SVPWM) technique. The control scheme is implemented using Matlab/Simulink. Experimental results using dSPACE validate the steady-state and the dynamic performance of the proposed control strategy.

scholarly journals Torque ripples improvement of direct torque controlled five-phase induction motor drive using backstepping control

2020 ◽  
Vol 11 (1) ◽  
pp. 64
Author(s):  
Hamdi Echeikh ◽  
Ramzi Trabelsi ◽  
Hichem Kesraoui ◽  
Atif Iqbal ◽  
Mohamed Faouzi Mimouni
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Control Unit ◽  
Torque Ripple ◽  
Torque Control ◽  
Motor Drive ◽  
Switching Frequency ◽  
Induction Motor Drive ◽  
Load Torque ◽  
Torque Ripples

The paper proposes Direct Torque Control (DTC) of a five-phase induction motor drive with reduced torque ripple. The method presented here is the DTC Backstepping based on the classic DTC working with a constant switching frequency of the inverter. Another remarkable aspect is the complexity of the method proposed, both in the control unit of the inverter and in the number of correctors necessary for the control of the torque. The selection table and hysteresis have been eliminated. This method significantly improves the torque and flux oscillations and improves the dynamics of the drive by making it less sensitive to load torque disturbances. The proposed method is developed and designed using Matlab/SIMULINK to show the eectiveness and performances of the DTC-Backstepping.

scholarly journals Generalized Approach for DCPWM Based Dual Inverter Fed OEWIM-DTC Drive

2021 ◽  
Vol 10 (2) ◽  
pp. 151-157
Author(s):  
M Nalini Devi ◽  
◽  
R Srinu Naik ◽  
Keyword(s):  
Induction Motor ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Direct Torque Control ◽  
Torque Control ◽  
Motor Drive ◽  
Switching Frequency ◽  
Induction Motor Drive ◽  
Three Phase ◽  
Simulation Results

A generalized procedure of decoupled pulse width modulation (DCPWM) based on Method called Direct Torque Control (DTC) for Open Ended Winding Induction motor drive (OEWIM) is anticipated in this paper. This drive topology uses two isolated dc sources with equal magnitudes, feeding two standard two level three-phase inverters. To overcome the complexity in classical space vector pulse width modulation (SVPWM) algorithm, a simple generalized approach is presented in this research by using the phase voltages. With this procedure, various PWM algorithms can be generated by varying a constant value. The dual inverters are operating independently with half of the switching frequency. To show the usefulness of proposed PWM fed DTC drive, simulation results analysis has been carried out by using MATLAB and results obtained.

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