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This paper will establish the simulation model and the inverter model of induction motor based on the multi function simulation software AMESim. Considering the influence on the motor from the temperature and other complex factors, and Using Matlab / Simulink software to establish a simulation model of direct torque control system, then we go on combined simulation through the combination of the two...
According to two-phase conduction state of the motor's three-phase six-star mode, the paper discusses and concludes the current commutation torque ripples generated by the mechanism. Being different from traditional parameter selection difficulties and torque ripple being not easy to control shortcomings to eliminate torque ripple methods, the paper proposes the compensation method for direct torque...
The reasons of torque ripples and flux trajectory resulted by conventional direct torque control of induction motor are discussed. A new control strategy combined predictive control algorithm with synthetic vector duty ratio control technology is proposed based on the discussion to improve the performance of Direct Torque Control (DTC). This method based on the current stator flux linkage and torque...
This paper presents a fuzzy logic controller (FLC) based direct torque control (DTC) scheme for speed control of IM drive over a wide speed range. The FLC is used to adjust the bandwidth of torque hysteresis controller in order to reduce the torque ripple of developed torque and hence to improve motor dynamic response. The effects of torque hysteresis band amplitude on the torque ripple of IM are...
There are some problems of torque ripples and flux ripples and current ripples in traditional direct torque control (DTC). System with speed sensor has lower reliability and higher system cost. To solve these problems, an extended Kalman filter(EKF) was established to observe stator flux linkage and estimate motor speed, thus speed sensorless direct torque control for asynchronous motor was realized...
Present work shows the merits of space vector modulation direct torque control(SVM-DTC) over the conventional direct torque control(conventional DTC). SVM-DTC technique is helpful in solving the basic issues of torque ripple and variable swithing frequency present in the conventional DTC. In order to get the reference voltage vector which is necessary for the SVM-DTC, this paper describes a method...
The direct torque control (DTC) technique has been widely used as a control strategy for motor drive system. High torque ripple is a major problem when the motor is running at low speed in DTC system. By analyzing the causes of torque ripple, it is can be found that the change of the speed error signal is a good indicator to determine the situation of motor torque ripple. In this paper, a DTC strategy...
The direct torque control (DTC) technique has been widely used as a control strategy for motor drive system. High torque ripple is a major problem when the motor is running at low speed in DTC system. By analyzing the causes of torque ripple, it is can be found that the change of the speed error signal is a good indicator to determine the situation of motor torque ripple. In this paper, a DTC strategy...
The mining hoist is a key transport equipment to transfer the workers and coal between the mining well and the ground. In the traditional mining hoist direct torque control system, there are some disadvantages such as torque pulsation in the low speed range, which is very dangerous to safety production. In this paper, a novel control strategy using ant colony algorithm (ACA) to optimize the parameters...
In this paper, a predictive direct torque control (DTC) of induction motor (IM) drive is presented. The control uses stator flux and current vectors as state variables. Predicted torque variation, with reference to its unforced response during each sampling time interval, is imposed with the aim of determining the pulse widths of the chain voltages of the supply inverter. The existence domain of the...
In this paper, an approach to DTC control scheme for induction machine is developed which makes DTC more applicable while it has lower torque ripple, lower flux ripple and almost fixed switching frequency rather than other DTC methods. Comparisons between simulation and practical results confirm that not any noticeable advantage of other developed DTCs is lost while it becomes more applicable. The...
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