What is it about?
The principle of vector control of electrical machines is to control both the magnitude and the phase of each phase, current and voltage. MATLAB/Simulink has been performed for assessment of operating features of the proposed scheme. Proportional Integral (PI) speed controller is designed in this paper. Test response of the developed variable speed drive along with the simulated response is given and discussed in detail for torque and speed. Fault tolerant fundamental is applied to the system when it is subject to a system fault. Two faults are investigated in this paper, stator short winding and broken rotor bar. The induction motor operates with acceptable performance in both speed and torque. The induction motor modeling along with the vector control fault tolerant scheme is investigated to show the optimal response of the control system
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Why is it important?
The control problems can be solved using this technique, in the following ways: • The stator current (torque and flux) components can be reached easily • Remove the difficulties of applying the direct torque control [Texas Instruments Europe, 1998]. There are two different strategies in vector control to get the rotor flux direct and indirect vector control. • Rotor flux vector is either measured by a flux sensor mounted in the air-gap or measured using the voltage equations starting from the electrical machine parameters.
Perspectives
The scalar control of induction motor drives has many drawbacks, including slow response, unsuitable performance, torque ripple, and the impossibility of operation at all points of the speed-torque curve, vector control is implemented on an induction motor drive to solve these imperfections. A three-phase sinusoidal voltage is converted to DC voltage with the help of the universal diode bridge rectifier. The rectified voltage is fed to the voltage source inverter & Current source inverter. The present research is directed to the formulation and experimental verification of parameter compensation schemes in the vector Controlled induction motor drives. Voltage source inverters that dominate modern adjustable speed AC drives have certain disadvantages. In particular, the high switching rate needed for the good quality of the current fed to the motor causes losses and electromagnetic interference. The short circuit stator winding and broken bar faults can have a significant effect on the induction motor working operation. According to the results, the fault-tolerant control algorithm was confirmed effectively.
Prof. Dr Khalaf Salloum Gaeid
Tikrit University
Read the Original
This page is a summary of: Fault Tolerant Control of Induction Motor, Modern Applied Science, August 2011, Canadian Center of Science and Education,
DOI: 10.5539/mas.v5n4p83.
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