scholarly journals Simulation and Analysis of Modified DTC of PMSM

2018 ◽  
Vol 8 (5) ◽  
pp. 2894
Author(s):  
D.Kiran Kumar ◽  
G.Tulasi Ram Das
Keyword(s):  
Permanent Magnet ◽  
High Power ◽  
Permanent Magnet Synchronous Motor ◽  
Pi Controller ◽  
Settling Time ◽  
Drive System ◽  
Torque Control ◽  
Phase Current ◽  
Look Up Table ◽  
Drive Systems

This research paper describes the simulation and analysis of the modified DTC for Surface mounted Permanent Magnet Synchronous Motor (SPMSM) using PI controller. Among all of the various drive systems,PMSM is widely used for accurate speed and torque control, with greater efficiency, superior torque to inertia and high power density.The Conventional DTC secheme widely used for this purpose but it is failed to achieve desirable performance of the system for which the modified DTC secheme is propsed.The modified DTC algorithm controls the voltage vectors, directly from a simple look up table depending on outcome of the torque and indirectly flux controllers.The overall drive system can be implemented in SIMULINK/MATLAB environment.The modified DTC is validated with loading conditions.The simulated results are focused on the speed, settling time at loaded conditions, torque and flux linkages ripple and THD in the phase current for modified DTC applied to SPMSM.

scholarly journals Simulation and Analysis of Modified DTC of PMSM

2018 ◽  
Vol 8 (5) ◽  
pp. 2895
Author(s):  
D.Kiran Kumar ◽  
G.Tulasi Ram Das
Keyword(s):  
Permanent Magnet ◽  
High Power ◽  
Permanent Magnet Synchronous Motor ◽  
Pi Controller ◽  
Settling Time ◽  
Drive System ◽  
Torque Control ◽  
Phase Current ◽  
Look Up Table ◽  
Drive Systems

This research paper describes the simulation and analysis of the modified DTC for Surface mounted Permanent Magnet Synchronous Motor (SPMSM) using PI controller. Among all of the various drive systems,PMSM is widely used for accurate speed and torque control, with greater efficiency, superior torque to inertia and high power density.The Conventional DTC secheme widely used for this purpose but it is failed to achieve desirable performance of the system for which the modified DTC secheme is propsed.The modified DTC algorithm controls the voltage vectors, directly from a simple look up table depending on outcome of the torque and indirectly flux controllers.The overall drive system can be implemented in SIMULINK/MATLAB environment.The modified DTC is validated with loading conditions.The simulated results are focused on the speed, settling time at loaded conditions, torque and flux linkages ripple and THD in the phase current for modified DTC applied to SPMSM.

scholarly journals Sliding-Mode-Observer-Based Open-Switch Diagnostic Method for Permanent Magnet Synchronous Motor Drive Connected with LC Filter

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3288
Author(s):  
Wang ◽  
Xu ◽  
Zou
Keyword(s):  
Permanent Magnet ◽  
Diagnostic Method ◽  
Sliding Mode ◽  
Permanent Magnet Synchronous Motor ◽  
Drive System ◽  
Motor Drive ◽  
Lc Filters ◽  
Open Switch ◽  
Drive Systems ◽  
Lc Filter

At present, pulse width modulation (PWM) technique is widely applied in motor drive systems. However, it may cause some unexpected effects: Bearing currents, overvoltage, power losses and unwanted noise. In some industrial cases, LC filters are always equipped in motor drive systems to suppress those unexpected effects. In order to improve the reliability and safety of the drive system, fault diagnostic strategies for power switches should be utilized as other drive systems without LC filters. In the literature, some open-switch diagnostic approaches are based on the observers derived from the mathematical models. However, the models are changed by the LC filters. Therefore, the existing approaches, based on the observers are failed, due to the change of the models. This study proposes an open-switch diagnostic method for permanent magnet synchronous motor (PMSM) drive equipped with LC Filter. The novelty of the proposed method is that the model of the LC filter is considered. Therefore, open-switch faults can be detected and located in the drive systems with LC filters. The switching function model of the drive system is analyzed at first. Then a sliding mode observer (SMO) considering the model of the filter is proposed to estimate the filter voltages and other state variables. Consequently, the faults can be detected and located through the residual errors between the expected and estimated filter voltages. This approach features simplicity. Furthermore, any extra sensors are not necessary. Experimental results on a 750-W PMSM drive system with an LC filter proved the feasibility of the proposed method.

scholarly journals Performance Enhancement of Direct Torque-Controlled Permanent Magnet Synchronous Motor with a Flexible Switching Table

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1907 ◽  
Author(s):  
Ahmed Nasr ◽  
Chunyang Gu ◽  
Serhiy Bozhko ◽  
Chris Gerada
Keyword(s):  
Permanent Magnet ◽  
Performance Enhancement ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Simple Algorithm ◽  
Drive System ◽  
Torque Control ◽  
Permanent Magnet Synchronous Motors ◽  
Dynamic Performances ◽  
Stator Flux

In this paper, a flexible switching table (FST) for direct torque control (DTC) of permanent magnet synchronous motors (PMSMs) was proposed to enhance the steady-state and dynamic performances of the drive system. First, the influence of each converter output voltage vectors on the torque and stator flux deviation rates was analyzed to assess the voltage selection strategies of the conventional STs and their impact on the DTC system’s performance. Then, a new flexible ST was proposed which uses a simple algorithm to adaptively select the appropriate voltage vector for two of its states according to the system operating condition. The effectiveness and feasibility of the proposed FST were verified through a comparative evaluation with the conventional STs using experimental results obtained from a 0.75 kW PMSM drive system.

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