Vinod Kumar | NIT, Rourkela (original) (raw)

Papers by Vinod Kumar

Research paper thumbnail of DIRECT TORQUE CONTROL OF INDUCTION MOTOR (PPT)

Direct torque control (DTC) is one of the most excellent control strategies of torque control in ... more Direct torque control (DTC) is one of the most excellent control strategies of torque control in induction motor. The aim is to control effectively the torque and flux. Torque control of an induction motor (IM) based on DTC strategy will be developed and a comprehensive study will be made in this project. Direct torque control is the first technology to control the real motor control variables of torque and flux. This method makes the rotor more accurate and fast control, high dynamic speed response and simple to control. The reference value can be calculated using the flux and torque estimation and also motor parameters.With the Joint progress of the power electronics and numerical electronics it is possible today to deal with the axis control with variable speed in low power applications. With these technological projections, various command approaches have been developed by the scientific community to master in real time, the flux and the torque of the electrical machines, the direct torque control (DTC) scheme being one of the most recent steps in this direction. This scheme provides excellent properties of regulation without rotational speed feedback. In this control scheme the electromagnetic torque and stator flux magnitude are estimated with only stator voltages and currents and this estimation does not depend on motor parameters except for the stator resistance.

Research paper thumbnail of Measuring the E ect of Retail Store Promotions on Brand and Store Substitution

Research paper thumbnail of Entropic measures of manufacturing flexibility

International Journal of Production Research, 1987

1. Manufacturing flexibility The issue of flexibility is assuming increasing importance in manufa... more 1. Manufacturing flexibility The issue of flexibility is assuming increasing importance in manufacturing management. The need for flexibility is growing due to the changing nature of competition which is based more than ever on both constantly changing technical chara&ristics of the ...

Research paper thumbnail of An assessment of data formats for layered manufacturing

Advances in Engineering Software, 1997

Layered manufacturing (LM) is an emerging technology for fabricating parts, layer by layer. This ... more Layered manufacturing (LM) is an emerging technology for fabricating parts, layer by layer. This technique offers several advantages over conventional manufacturing. The data representation and exchange issues in LM are crucial, and currently the STL format is used as an industry standard. In this paper, we consider 3-D and slice data formats in LM and analyse their strengths and weaknesses. We perform an in-depth analysis of the STL format and comment on the perceived need for its replacement. We also propose metrics for the evaluation of the 3-D and slice formats and compare them. The study reported in this paper can provide guidelines for the development of new representations and formats for use in LM. 8 1997 Elsevier Science Limited. All rights reserved.

Research paper thumbnail of An Approach to Modeling & Representation of Heterogeneous Objects

Journal of Mechanical Design, 1998

Heterogeneous objects, composed of different materials, are increasingly being used in engineerin... more Heterogeneous objects, composed of different materials, are increasingly being used in engineering applications. Also, a new fabrication method called Layered Manufacturing (LM) has shown potential to manufacture these objects. In order to manufacture ...

Research paper thumbnail of Direct Torque Control of Induction Motor Using Space Vector Modulation (SVM-DTC

In this study, direct torque control (DTC) of induction motor is evaluated based on space vector ... more In this study, direct torque control (DTC) of induction motor is evaluated based on space vector modulation (SVM). DTC is a method to control machine with utilizing torque and flux of motor controlled. The torque and current ripple are occurred in the conventional DTC. Reason of undesired torque and current ripple is low number of voltage vectors applied to the motor controlled by the conventional DTC technique. SVM-DTC is a technique to reduce the ripple. SVM techniques have several advantages that are offering better DC bus utilization, lower torque ripple, lower total harmonic distortion in the AC motor current, lower switching loss, and easier to implement in the digital systems. Simulation results from the classical and improved DTC are presented and compared. Result shows that the torque, flux linkage and stator current ripple are decreased with the improved DTC.

Research paper thumbnail of DIRECT TORQUE CONTROL OF INDUCTION MOTOR (PPT)

Direct torque control (DTC) is one of the most excellent control strategies of torque control in ... more Direct torque control (DTC) is one of the most excellent control strategies of torque control in induction motor. The aim is to control effectively the torque and flux. Torque control of an induction motor (IM) based on DTC strategy will be developed and a comprehensive study will be made in this project. Direct torque control is the first technology to control the real motor control variables of torque and flux. This method makes the rotor more accurate and fast control, high dynamic speed response and simple to control. The reference value can be calculated using the flux and torque estimation and also motor parameters.With the Joint progress of the power electronics and numerical electronics it is possible today to deal with the axis control with variable speed in low power applications. With these technological projections, various command approaches have been developed by the scientific community to master in real time, the flux and the torque of the electrical machines, the direct torque control (DTC) scheme being one of the most recent steps in this direction. This scheme provides excellent properties of regulation without rotational speed feedback. In this control scheme the electromagnetic torque and stator flux magnitude are estimated with only stator voltages and currents and this estimation does not depend on motor parameters except for the stator resistance.

Research paper thumbnail of Measuring the E ect of Retail Store Promotions on Brand and Store Substitution

Research paper thumbnail of Entropic measures of manufacturing flexibility

International Journal of Production Research, 1987

1. Manufacturing flexibility The issue of flexibility is assuming increasing importance in manufa... more 1. Manufacturing flexibility The issue of flexibility is assuming increasing importance in manufacturing management. The need for flexibility is growing due to the changing nature of competition which is based more than ever on both constantly changing technical chara&ristics of the ...

Research paper thumbnail of An assessment of data formats for layered manufacturing

Advances in Engineering Software, 1997

Layered manufacturing (LM) is an emerging technology for fabricating parts, layer by layer. This ... more Layered manufacturing (LM) is an emerging technology for fabricating parts, layer by layer. This technique offers several advantages over conventional manufacturing. The data representation and exchange issues in LM are crucial, and currently the STL format is used as an industry standard. In this paper, we consider 3-D and slice data formats in LM and analyse their strengths and weaknesses. We perform an in-depth analysis of the STL format and comment on the perceived need for its replacement. We also propose metrics for the evaluation of the 3-D and slice formats and compare them. The study reported in this paper can provide guidelines for the development of new representations and formats for use in LM. 8 1997 Elsevier Science Limited. All rights reserved.

Research paper thumbnail of An Approach to Modeling & Representation of Heterogeneous Objects

Journal of Mechanical Design, 1998

Heterogeneous objects, composed of different materials, are increasingly being used in engineerin... more Heterogeneous objects, composed of different materials, are increasingly being used in engineering applications. Also, a new fabrication method called Layered Manufacturing (LM) has shown potential to manufacture these objects. In order to manufacture ...

Research paper thumbnail of Direct Torque Control of Induction Motor Using Space Vector Modulation (SVM-DTC

In this study, direct torque control (DTC) of induction motor is evaluated based on space vector ... more In this study, direct torque control (DTC) of induction motor is evaluated based on space vector modulation (SVM). DTC is a method to control machine with utilizing torque and flux of motor controlled. The torque and current ripple are occurred in the conventional DTC. Reason of undesired torque and current ripple is low number of voltage vectors applied to the motor controlled by the conventional DTC technique. SVM-DTC is a technique to reduce the ripple. SVM techniques have several advantages that are offering better DC bus utilization, lower torque ripple, lower total harmonic distortion in the AC motor current, lower switching loss, and easier to implement in the digital systems. Simulation results from the classical and improved DTC are presented and compared. Result shows that the torque, flux linkage and stator current ripple are decreased with the improved DTC.