Improvement of Torque Response and Examination of Sensorless Drive System Based on Direct Torque Control for IPMSM

2008 ◽  
Vol 128 (1) ◽  
pp. 78-86 ◽  
Author(s):  
Yukinori Inoue ◽  
Shigeo Morimoto ◽  
Masayuki Sanada
Keyword(s):  
Direct Torque Control ◽  
Drive System ◽  
Torque Control ◽  
Torque Response ◽  
Sensorless Drive

Modified Look-Up Table for Enhancement of Torque Response in Direct Torque Controlled Induction Machine

2017 ◽  
Vol 8 (2) ◽  
pp. 522
Author(s):  
Goh Wee Yen ◽  
Nik Rumzi Nik Idris ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Direct Torque Control ◽  
Induction Machine ◽  
Drive System ◽  
Torque Control ◽  
Duty Ratio ◽  
Activation Time ◽  
Light Load ◽  
Look Up Table ◽  
Voltage Vector ◽  
Torque Response

Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.

scholarly journals DTC-ANN-2-level hybrid by neuronal hysteresis with mechanical sensorless induction motor drive using KUBOTA observer

2020 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Dris Ahmed ◽  
Bendjebbar Mokhtar ◽  
Belaidi Aek
Keyword(s):  
Direct Torque Control ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Drive System ◽  
Torque Control ◽  
Stator Current ◽  
Ac Drive ◽  
Control Scheme ◽  
Stator Flux ◽  
Robust Response

In this paper, DTC is applied for two-level inverter fed IM drives based on neuronal hysteresis comparators and The Direct Torque Control (DTC) is known to produce quick and robust response in AC drive system. However, during steady state, torque, flux and current ripple. An improvement of electric drive system can be obtained using a DTC method based on ANNs which reduces the torque and flux ripples, the estimated the rotor speed using the KUBOTA observer method based on measurements of electrical quantities of the motor. The validity of the proposed methods is confirmed by the simulation results.The THD (Total Harmonic Distortion) of stator current, torque ripple and stator flux ripple are determined and compared with conventional DTC control scheme using Matlab/Simulink environment.

scholarly journals Extending DC Bus Utilization for Induction Motors with Stator Flux Oriented Direct Torque Control

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 374
Author(s):  
Tomas Esparza Sola ◽  
Huang-Jen Chiu ◽  
Yu-Chen Liu ◽  
Arief Noor Rahman
Keyword(s):  
Direct Torque Control ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Torque Control ◽  
Smooth Transition ◽  
Torque Response ◽  
Dc Bus ◽  
Low Torque ◽  
Stator Flux ◽  
Stator Flux Oriented

This paper presents a method to extend the DC bus utilization on an induction motor (IM) by using a combination of Space-Vector Modulated Direct Torque Control (DTC–SVM) and conventional DTC. The scheme proposed in this paper exploits the advantages of both control methods. During the linear region, it allows for a low torque ripple and low current harmonic distortion (THD). During the overmodulation region, it allows for the fastest torque response up to the six-step operation region. In both regions, there is complete independence of the motor parameters. The paper describes a way to provide a smooth transition between the two control schemes. Non-linearities affect the stator flux angle estimation, which leads to the inability to decouple torque and flux. To overcome this problem, a novel PI-based control scheme as well as a simplification on the decoupling terms’ calculation are proposed. Simulation and experimental results are presented to verify the feasibility of the proposed method.

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