High Performance Torque Control of Induction Motor using DTC-SVM

Authors:- Janikiram S ; kranthi M

Abstract:-Direct Torque Control is a control technique in AC drive systems to obtain high performance torque control. The conventional DTC drive contains a pair of hysteresis comparators. DTC drives utilizing hysteresis comparators suffer from high torque ripple and variable switching frequency. The most common solution to those problems is to use the space vector depends on the reference torque and flux. In this Paper The space vector modulation technique (SVPWM) is applied to 2 level inverter control in the proposed DTC-based induction motor drive system, thereby dramatically reducing the torque ripple. Then the controller based on space vector modulation is designed to be applied in the control of Induction Motor (IM) with a three-level Inverter. This type of Inverter has several advantages over the standard two-level VSI, such as a greater number of levels in the output voltage waveforms, Lower dV/dt, less harmonic distortion in voltage and current waveforms and lower switching frequencies. This paper proposes a general SVPWM algorithm for three-level based on standard two-level SVPWM. The proposed scheme is described clearly and simulation results are reported to demonstrate its effectiveness. The entire control scheme is implemented with Matlab/Simulink.

Intelligent Embedded Control Warning System For Car Reversing

Authors:- gopala krishna, V prasad

Abstract:IR means “INFRARED”. Infrared (IR) light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light at 0.74 micrometers (µm), and extending conventionally to 300 µm. These wavelengths correspond to a frequency range of approximately 1 to 400 THz, and include most of the thermal radiation emitted by objects near room temperature. Microscopically, IR light is typically emitted or absorbed by molecules when they change their rotational-vibration movements.

Authenticated And Access Control System For Device Using Smart Card Technology

Authors: karun kumar; Mukesh yadav

Abstract: Security is a prime concern in our day-today life. Everyone wants to  be as much secure as possible. An access control for doors forms a  vital link in a security chain. The microcontroller  based Door locker is  an access control system that allows only authorized persons to  access a restricted  area.Smart card based access control system is an application specific project, which can be used universally any where security is prime concern. The security to a property, organization and other purposes where a human being entering into can be checked or segregated between authorized and unauthorized persons by implementing this project. Secure life, secure property is what everyone desires. So a lot of money and interest is spent in this area. The important installations are to be protected from unauthorized intruders, as well as home are to be secure from same factors. Today man less intelligent automatic machines are used in every field so that manpower can be least used and efficient work can be achieved .The intelligent machine only solution in this field is microprocessor. However the microprocessor forms complex structure. Therefore micro controller is the best solution.The Smart card based access control system presented here is an access control system that allows only authorized persons to access a restricted area.