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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...
The speed of three phase Induction Motor (IM) drives are controlled with the help of vector control and scalar control. Direct Torque Control (DTC) is advanced scalar control technique for speed control of IM drives. Fast response, dynamic performance and robustness has made DTC very popular. The Conventional DTC drive requires no coordinate transformation and therefore its control algorithm becomes...
For limitation in switch selection and the torque ripples in the traditional direct torque control, an improved direct torque control method is proposed in this paper. This control strategy combines the direct torque control strategy and model predictive control strategy. First of all, pre-select the switching states from the direct torque control strategy and then select the switching state of the...
Induction motors are presently used in many electric vehicle applications. As a result, their control methods have received a lot of attention. One of the efficient method of induction motor control is the direct torque control (DTC). In this paper, a design method for direct torque control of induction motor has been developed. A Verilog hardware description language is used to implement the developed...
We present an efficient FPGA based implementation of a dynamic simulation framework for Direct Torque Control (DTC) of induction motors. The merit of the proposed DTC emulation framework lies in that it is completely implemented within an FPGA, and therefore can be easily utilized for exploratory system optimizations. The high performance and low area foot-print of the proposed framework implemented...
The conventional direct torque control system in low speed condition has the larger motor torque ripple, that makes the system's low-speed performance poor. To address this problem, we use neural network supervisory controller to replace the original PID controller based on the traditional direct torque control system, and create a system model by the Sim Power Systems of MATLAB software. This system...
The stator flux observer is a key part in the method of Direct Torque Control (DTC). However, the accuracy of the stator flux estimation directly affected the performance of DTC. The traditional induction motor stator flux observation method have been analyzed in This paper. And for the Shortcomings of existing methods, a on-line identification methods based on Radial Basis Function(RBF) have been...
Direct Torque Control (DTC) is becoming one of the most popular control methods for induction motors.This technique was introduced in the mid 1980's for voltage fed PWM inverter drives.Matrix converter (MC) has been studied widely for its advantages over the traditional converters.It is gradually employed for applications with its maturity in theoretical studies.A novel control strategy is put forward...
For the defects of conventional direct torque control (DTC) system of switched reluctance motors (SRM), RBF neural network (RBFNN) and fuzzy adaptive PID controller are applied to direct torque control system of SRM in the paper. Switching state table is replaced by RBFNN; fuzzy adaptive PID controller is applied to the outer loop for speed adjustment. In order to verify the validity of the method,...
The role of proportional-integral (PI) controller as a speed controller for a induction Motor (IM) in high performance drive system is still vital although new control techniques such as direct torque control that is more effective -but complex- is available. However, PI controller is slow in adapting to speed changes, load disturbances and parameters variations without continuous tuning of its gains...
Squirrel-cage induction motors are replacing DC motors in variable speed applications due to the availability of advanced control techniques such as Direct Torque Control and Field Oriented Control. At part-load operation of an induction machine, the core losses and, to some extent, copper losses can be minimized, if the machine is operated at a reduced value of flux rather than at the rated value...
A sliding mode controller for induction motor (IM) is investigated in this paper. It features in very low flux and torque ripple. In order to guarantee electromagnetic torque and stator flux to track its reference signal strictly, the electromagnetic torque sliding mode variable and stator flux sliding mode variable were selected separately. Furthermore, a robust stator flux observer is designed for...
To solve the problems of torque ripple and inconstant switch frequency of inverter in the conventional direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive, a novel DTC method using space vector pulse width modulation (SVM) is proposed based on analysis of PMSM mathematical model. In this novel DTC system of PMSM , traditional torque hysteresis controller and flux hysteresis...
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