Examination and linearization of torque control system for direct torque controlled IPMSM
0
Citation
0
Reference
20
Related Paper
Abstract:
This paper examines the torque response based on direct torque control (DTC) for an interior permanent magnet synchronous motor. DTC with a PI controller for torque control is used in this paper. The relationship between the gains of the PI controller and the torque response is derived based on the transfer function of the torque control loop. In addition, this paper discusses the influence of the nonlinearity of the torque control loop on the torque response. It also proposes a linearization method for the torque control loop based on gain scheduling, and improvement of torque response is achieved. The effectiveness of the proposed method is verified by both simulation and experimental results.Keywords:
Stall torque
Damping torque
Torque motor
Torque limiter
Feedback linearization
Cite
Here, a new fuzzy direct torque control algorithm for induction motors is proposed. As in the classical direct torque control, the inverter gate control signals directly come from the optimum switching voltage vector look-up table, the best voltage space vector selection is a key factor to obtain minimum torque and flux ripples. In the proposed approach, the best voltage space vector is selected using a new fuzzy method. A simulation model is built up and the torque and flux ripples of basic direct torque control and the proposed method are compared. The simulation results show that the torque and flux ripples are significantly decreased and in addition, the switching frequency can be fixed.
Cite
Citations (11)
In this paper, a discretization error compensation method in a motor drive system by using direct torque control (DTC) is proposed. Similar to a conventional current control system, DTC allows an efficient drive and a wide range drive. Furthermore, it has the advantage that its control system can be simple and theoretically it can realize sensorless position control. Therefore, a reference flux vector calculator (RFVC) DTC is studied as a system for the ultra-high-speed drive control of permanent magnet synchronous motors (PMSMs). In high-speed drive, we revealed that a discretization error in the DTC generates an error in the instruction magnetic flux and stator magnetic flux. In addition, we revealed that current detection timing generates an error in the estimated torque and real torque. Then, we propose a compensation method to cancel the flux and torque error focusing on the phase of the stator magnetic flux and experimentally verifying its effectiveness.
Torque motor
Cite
Citations (1)
Direct torque control technique possesses the quick response of torque, simple structure, good robustness, and other advantages. Starting with the analysis from several aspects such as the development, main control ideas and the contemporary research status of Direct Torque Control, this thesis summarizes the intelligent and integration-oriented trends.
Robustness
Torque motor
Cite
Citations (2)
To improve the steady state efficiency of interior permanent magnet synchronous motor system(IPMSM), the intelligent integrated online optimal control strategy of IPMSM efficiency optimization was presented. The intelligent integrated control technology and torque compensation method were combined to the system. The method of adaptive fuzzy logic to adjust direct-axis current was adopted in the first half search, using the adaptive step size to reduce the torque fluctuations. The golden section search method was adopted in the next half search to speed up the search process and improve its convergence. While in the whole process, the torque correction program was introduced to compensate the torque current in real-time and resolve the torque pulsation problem in the regulation process of the excitation current. The dynamic and static performances of the system are improved. A 100kW IPMSM efficiency optimization intelligent integrated control system was implemented using a TMS320LF2407A DSP. Experimental results prove the validity of the proposed strategy.
Synchronous motor
Cite
Citations (7)
Torque ripple
Stall torque
Torque motor
Torque limiter
Cite
Citations (0)
In this paper a feedback linearization control (FLC) is implemented on a vector controlled induction motor (IM) drives. A complete mathematical model of the vector controlled drive and feedback linearization controller is derived and simulation study in MATLAB/Simulink is carried out and dynamic performance of the drive is presented under different operating conditions. Two new control inputs are developed using output of Proportional Integral controllers which regulate the rotor flux and rotor speed. These new control inputs are used to create decoupled flux producing components of stator current and torque components of stator current. The conventional indirect field oriented control (IFOC) and FLC based controlled induction motor drive is simulated in MATLAB/Simulink and validated experimentally on developed laboratory prototype usingdSPACE1104 controller boardand dynamic performance of the both controlled scheme is compared.
Feedback linearization
Linearization
Cite
Citations (6)
In this paper a new control technique is proposed by using fuzzy logic control for direct torque control of induction motor. Contemporarily, induction motor is most commonly used for variable speed drive application because of following advantages over DC drives: low maintenance cost, high efficiency; robust and rigged operation; and can be used in any environmental conditions. Field oriented control is one of the strategy for control of induction motor and has been widely acknowledged in drive industry. But due to its complexities such as sensitivity to parameter variation, tuning, temperature and tedious vector calculations, direct torque control technique is gaining importance. Large torque ripples occur in induction motor, based on conventional direct torque control system. For this problem of DTC, fuzzy control theory is proposed and executed. A modified look up table for the selection of switching vectors is proposed. Space vector modulation technique is used to synthesize the inverter output voltages. Fuzzy controller system is applied for 1.5kW of motor which selects appropriate voltage space vector for minimum torque ripples. The proposed scheme is simulated on the platform of Matlab/Simulink.
Space vector modulation
Torque motor
Cite
Citations (4)
In this project, for analysing the performance of 3Ф induction motor drive which is having its previous methodologies to obtain the performance parameters such as speed regulation and optimization of stator flux and torque ripples of a three phase induction motor drive for it to achieve its high efficiency. Initialising with control techniques as Direct Torque Control (DTC) implementing the controller strategies like Proportional Integral controller and Fuzzy logic controller combined, demanding a minimisation of torque ripples and its co – factors that which influence the performance prediction of an induction motor.Comparing the modules where PI controller and Field Oriented control method included, it permits an independent control of torque and flux by decoupling the stator current into two orthogonal components. However is very sensitive to flux which is mainly affected by parameter variations. Whereas in case of Direct Torque Control method the voltage vectors are selected based on the difference between the reference, actual torque and stator flux linkage. The proposed DTC technique gives better performance in the threephase IMD than conventional DTC technique
Flux linkage
Decoupling (probability)
Torque motor
Cite
Citations (0)
The induction motor has a wide range of industrial application attributed to its robust construction, simplicity in design and cost-effectiveness. For achieving the best potency of the motor several methods of management have developed in the course of time. Of these direct torque control (DTC) has gained importance due to its fast torque control of induction motor. A key feature of DTC is its ability to control flux linkage and electromagnetic torque in direct and independently by proper selection of voltage vectors. However conventional DTC has several shortcomings such as high ripple contents in torque and flux and inconsistent switching frequency. This paper discusses the strategy to overcome the high ripples content in torque and flux. A novel strategy for selection of optimum voltage vector from a fuzzy controller which has the flux locus divided into 12 sector compared to the conventional 6 sector. The predictive method for voltage vector and the 12 sector concepts has been modelled and simulated, and their results have been reported in this paper.
Flux linkage
Damping torque
Torque ripple
Stall torque
Cite
Citations (5)
In this paper, Direct Torque Control (DTC) approaches of induction motor (IM) drives has been proposed and it is extensively implemented in industrial variable speed applications. This paper presents a unique direct torque control (DTC) approach for induction motor (IM) drives fed by using a fuzzy logic controller. The intention is to develop a low-ripple high-performance induction motor (IM) drive. The presented scheme is founded on the emulation of the operation of the conservative six switch three-phase inverter. It routines the dc current to re-construct the stator currents desired to estimate the motor flux and the electromagnetic torque. This methodology has been adopted in the design of the vector selection table of the suggested DTC approach through fuzzy logic controller. The modelling and simulation results of direct torque control of induction motor have been confirmed by means of the software package MATLAB/Simulink. Index Terms—Induction machine, Direct torque control, Fuzzy logic controller.
Torque motor
Torque ripple
Cite
Citations (0)