Study on direct torque control of permanent magnet synchronous motor based on observing stator flux linkage

2006 ◽  
Author(s):  
Lin Weijie
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Synchronous Motor ◽  
Torque Control ◽  
Flux Linkage ◽  
Stator Flux

scholarly journals Comparative Evaluation for Torque Control Strategies of Interior Permanent Magnet Synchronous Motor for Electric Vehicles

2021 ◽  
Author(s):  
Hanaa Elsherbiny ◽  
Mohamed Kamal Ahmed ◽  
Mahmoud Elwany
Keyword(s):  
Permanent Magnet ◽  
Detailed Analysis ◽  
Electric Vehicles ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Synchronous Motor ◽  
Torque Control ◽  
Maximum Efficiency ◽  
Flux Linkage ◽  
Interior Permanent Magnet

This paper presents a detailed analysis and comparative investigation for the torque control techniques of interior permanent magnet synchronous motor (IPMSM) for electric vehicles (EVs). The study involves the field-oriented control (FOC), direct torque control (DTC), and model predictive direct torque control (MPDTC) techniques. The control aims to achieve vehicle requirements that involve maximum torque per ampere (MTPA), minimum torque ripples, maximum efficiency, fast dynamics, and wide speed range. The MTPA is achieved by the direct calculation of reference flux-linkage as a function of commanded torque. The calculation of reference flux-linkage is done online by the solution of a quartic equation. Therefore, it is a more practical solution compared to look-up table methods that depend on machine parameters and require extensive offline calculations in advance. For realistic results, the IPMSM model is built considering iron losses. Besides, the IGBTs and diodes losses (conduction and switching losses) in power inverter are modeled and calculated to estimate properly total system efficiency. In addition, a bidirectional dc-dc boost converter is connected to the battery to improve the overall drive performance and achieve higher efficiency values. Also, instead of the conventional PI controller which suffers from parameter variation, the control scheme includes an adaptive fuzzy logic controller (FLC) to provide better speed tracking performance. It also provides a better robustness against disturbance and uncertainties. Finally, a series of simulation results with detailed analysis are executed for a 60 kW IPMSM. The electric vehicle (EV) parameters are equivalent to Nissan Leaf 2018 electric car.

Simulation Reach of Permanent Magnet Synchronous Motor System Based on Speed Sensor-Less Direct Torque Control

2014 ◽  
Vol 643 ◽  
pp. 32-36
Author(s):  
Meng Yuan Chen ◽  
Yue Dong Chen
Keyword(s):  
Permanent Magnet ◽  
Motor System ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Mathematic Model ◽  
Synchronous Motor ◽  
Torque Control ◽  
Speed Sensor ◽  
Response Performance ◽  
Stator Flux

The simulation model of permanent magnet synchronous motor system based on speed sensor-less direct torque control is built by analysing the mathematic model of permanent magnet synchronous motor and the theory of direct torque control in this dissertation, and the system’s speed and position is estimated by calculating the angle of stator flux linkage. MATLAB/Simulink is utilized to simulate the system, and the simulation results are analyzed, with which the simulation result prove the correctness and feasibility of the estimation using in this dissertation and good dynamic response performance of the system.

Simulation Research of Direct Torque Control for Marine Permanent Magnet Synchronous Motor

2014 ◽  
Vol 1044-1045 ◽  
pp. 858-862
Author(s):  
Ke Yi Zhan ◽  
Hai Bo Gao ◽  
Fei Fei Chi
Keyword(s):  
Permanent Magnet ◽  
Electric Propulsion ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Torque Control ◽  
Permanent Magnet Synchronous Motors ◽  
Simulation Research ◽  
Stator Flux

The permanent magnet synchronous motors are more and more popular in marine electric propulsion field. Aiming to solve the problem of large torque ripple in traditional DTC system, this paper introduces the principle of space vector modulation and builds the electric propulsion system models based on direct torque control for permanent magnet synchronous motor in Simulink. Typical working condition experiments are designed to contrast the performances between traditional DTC and SVM-DTC. Simulation result proves that SVM-DTC can reduce ripples of both electromagnetic torque and stator flux effectively with the same dynamic response character as traditional DTC system.

Research on ALA+SPM Rotor Synchronous Motor Direct Torque Control

2010 ◽  
Vol 121-122 ◽  
pp. 866-871
Author(s):  
Xue Zhen Chen
Keyword(s):  
Permanent Magnet ◽  
Control Method ◽  
Direct Torque Control ◽  
Synchronous Motor ◽  
Torque Control ◽  
Flux Linkage ◽  
Permanent Magnet Motor ◽  
Maximum Torque ◽  
Stator Current ◽  
Stator Flux

This paper compares the electromagnet torque characteristics of ALA+PM rotor synchronous motor with the conventional permanent magnet motor, the former holds on linearity relationship with the increase of the stator flux linkage, but the later needs restrict condition. The direct electromagnet torque control is the best control method for ALA+PM rotor synchronous motor, but the stator current can increase if the stator flux linkage is bigger or smaller than magnet flux linkage, the maximum torque current percent ampere control method is used to overcome the disadvantage.

Simulation of Permanent Magnet Synchronous Motor for Electric Vehicle Indirect-Torque Control System

2011 ◽  
Vol 383-390 ◽  
pp. 7438-7443
Author(s):  
Chun Liu Wang ◽  
Jin Jian Li ◽  
Xiao Yun Feng
Keyword(s):  
Permanent Magnet ◽  
Electric Vehicle ◽  
Permanent Magnets ◽  
Pulse Width Modulation ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Synchronous Motor ◽  
Torque Control ◽  
Smooth Transition ◽  
Stator Flux

For the request of electric vehicle on drive motor, the permanent magnet synchronous motor (PMSM) get more and more attention by its small size and torque characteristics. By analyzing the traction motor characteristics with a constant torque starting and constant power operation, the space vector pulse width modulation (SVPWM) algorithm is used to replace the switching table for direct torque control (DTC) strategy. By analyzing the mathematical model of the PMSM, for the existence of permanent magnets, the rotor coordinate system is applied when calculating the stator flux. Meanwhile, the electric vehicle starting block and the brake block are simulated for the characteristics of that walk namely stop. The results show that the speed has a smooth transition and the torque has a quick response.

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