A. B. Raju

Four quadrant close loop speed control of DC motor

This paper elucidates Low Cost, High performance Chopper based Four Quadrant close loop control of DC Motor. The drive system realized is applicable to Hybrid Electric Vehicles (HEVs) working in all four quadrants. The drive system has been developed and modeled using Scilab /XCOS. The objective of simulation is to predict the performance of the drive system under realistic operating conditions. Close loop speed control of Chopper fed Separately Excited DC Motor (SEDC) is obtained using TIs F28069-M launch pad. Experimental results validate the high performance of the control algorithm utilized in the DC Drive system.

Speed control of separately excited DC motor using class a chopper

This paper deals with design and implementation of speed controller to control the speed of separately excited DC motor using a class A chopper. The speed of Separately Excited DC motor is controlled to a maximum of its rated speed using chopper as a converter. The speed controller used is Proportional Integral type which reduces steady state error and provides fast control. The parameters of the speed controller have been designed using control system theory. The validity of the proposed approach is presented by simulating the DC drive system in SCILAB (XCOS) and also by implementing the same using TIsF28027 launch pad under varying speed and varying load conditions.

Speed control of 3-phase induction motor using volt/hertz control for automotive application

The induction machine is the work horse of the industry. It has rugged construction and is suitable for many high power applications. It has also been a key aspect in revolutionizing the locomotive and the automotive industries. For such automotive applications speed control becomes the driving factor. Hence in this we discuss controlling the speed of 3-phase induction motor using constant volt per hertz profile. The motor is controlled using 3-phase inverter. SPWM technique is used to control the inverter voltage. Modelling of the induction motor is done in stationary reference frame and the system in simulated using MATLAB (Simulink) and hardware implementation is done for the same using TIs F28069M launch pad under varying speed and load torque conditions.

Reliability of DC-DC converters used as MPPT in grid connected photovoltaic systems

Reliability is the key necessity in power electronic components by which the life time, number of failures and associated cost are estimated. This paper presents the reliability analysis of power electronic circuits in Grid connected Photovoltaic system. The analysis is mainly based on estimating the Mean Time between Failures (MTBF) and reliability of three different DC-DC converter topologies (Buck, Boost and Buck-boost) which serve as maximum power point tracker (MPPT) in Grid connected photovoltaic systems. By calculating the failure rate of each component of the converter, the reliability and MTBF is obtained and comparison of the converters is done for various levels of solar insolation which indirectly corresponds to the various power of the load. The reliability calculation is done based on MIL-HDBK-217 (Military handbook) standards. All the computations are done using free open source Python programming language.

A Virtual Industry Platform for Course Projects in Automotive Electronics : A Case Study

The paper explores the new technology commercialization model being followed at The University of Akron (UA).UA has implemented the National Science Foundation (NSF)Innovation ICorpsTMmodel since 2013. This paper describes how the NSF I-Corps model has changed the innovation culture at UA and allowed the academic faculty to explore the business potential of their intellectual property.Differences in implementation across several I-Corps Sites are explored. The lessons from UAs experience show that the I-Corps Sites program has been a resounding success and helped faculty and students to become more entrepreneurial in exploring the commercial value and demand drivers of technologies invented at UA.Students are more attracted towards and enthusiastic about modern teaching techniques. This paper provides a new concept in the design of a coursework thus enabling the teachers to enhance the teaching and learning process. The course work, laboratory and course projects are linked through proper planning. It is observed that there is an increase in the degree of involvement of the students in the course and they move from doing demonstrations to structured enquiry and also open ended enquiry. This new framework can also address some of the ABET criteria effectively. Results show positive response from the students towards this new technique.The real time experience of Signals and Systems has been embedded in the form of mathematical expressions. The learners fi nd diffi culty in applying these mathematical concepts in a real time scenario. This paper presents the details of effective learning technique attempted for the Signals and Systems course at the under graduate engineering program using mind mapping. Mind mapping as a technique tests the students ability for interactive learning to improve retention and reduce revision time. This paper discusses about the effects of digital/ paper-based mind mapping over conventional teaching method to shift an teaching centric to learning centric. This learning not only focuses on retention of concepts but also caters to the generation of ideas required for solving an engineering problem, which in turn improves the writing skills of the students. Findings showed that there was a signifi cant positive difference in students academic achievement and attitude towards learning the subject through the paper/digital based mind mapping.