Electrical and Electronics Engineering

Drive: A combination of prime mover, transmission equipment and mechanical working load is called a drive Electric drive: An Electric Drive can be defined as an electromechanical device for converting electrical energy to mechanical energy to impart motion to different machines and mechanisms for various kinds of process control.

An elderly carpenter was ready to retire. He told his employer-contractor of his plans to leave the house-building business and live a more leisurely life with his wife enjoying his extended family. He would miss his paycheck, but he needed to retire. They could get by. The contractor was sorry to see his good worker go and asked if he could build just one more house as a personal favor. The carpenter said yes, but in time it was easy to see that his heart was not in his work. He resorted to shoddy workmanship and used inferior materials. It was an unfortunate way to end his career. When the carpenter finished his work and the builder came to inspect the house, the contractor handed over the house key to the carpenter. "This is your house," he said, "it is my parting gift to you." What a shock! What a Shame! If only he had known he was building his own house, he would have done it all so differently. Now he had to live in the home he built none too well.

This paper presents the Direct Torque Control (DTC) of induction motor drive using matrix converters. DTC is a high performance motor control scheme with fast torque and flux responses. However, the main disadvantage of conventional DTC is electromagnetic torque ripple. In this paper, direct torque control for Induction Motors using Matrix Converters is analysed and points out the problem of the

Single-phase induction motors are widely used in fractional power applications such as fans, refrigerators and air conditioners. An improvement in its performance means a great saving in electrical energy. The motor can be operated at constant speed or controlled by ON/OFF strategy which results in poor performance and low power factor. An inverter-fed variable frequency motor is a typical example of such improvement. Nowadays, a direct AC-to-AC converter commonly termed as Matrix Converter has a simple structure and many attractive features. These converters have the characteristics such as four quadrant operation, unity input power factor, no dc-link capacitor and high quality voltage/current waveforms. Matrix Converters are replacing the conventional Voltage Source Inverters. In this regard, this paper presents a comprehensive analysis of the performance of the single-phase induction motor when it is fed with single phase inverters and matrix converters. Sinusoidal Pulse Width Modulation (SPWM) technique is used to generate the firing pulses for power switches of the inverter and matrix converter. Simulations were done using MATLAB/Simulink software package and the results were analyzed and presented.

This paper presents the direct torque control of induction motor drive using matrix converters. DTC is a high performance motor control scheme with fast torque and flux responses. However, the main disadvantage of conventional DTC is electromagnetic torque ripple. In this paper, direct torque control for Induction Motors using Matrix Converters is analysed and points out the problem of the electromagnetic torque ripple which is one of the most important drawbacks of the Direct Torque Control. Besides, the matrix converter is a single-stage ac-ac power conversion device without dc-link energy storage elements. Matrix converter (MC) may become a good alternative to voltage-source inverter (VSI). This work combines the advantages of the matrix converter with those of the DTC technique, generating the required voltage vectors under unity input power factor operation. Simulation results demonstrates the effectiveness of the torque control.