Faculty Publications
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Publications by NITK Faculty
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Item Rotor position estimation and design of low cost controller circuit for switched reluctance motor based on machine design parameters(2010) Uday Kumar, R.Y.; Shaik, A.A.; Deepika, K.S.R.An efficient and reliable operation of the Switched Reluctance Motor (SRM) can be achieved only by proper estimation of the rotor position. The rotor position information in switched reluctance motor (SRM) drives is essential for generating the proper firing sequence and for controlling the speed of the drive. Also SRM drives in recent days are more expensive than their conventional AC and DC drives. This is to a great extent caused by the lack of a standardized power electronic converter for SRM drives. This paper describes a new and simple method for determining the rotor position of a switched reluctance motor (SRM) based on motor design structure and a design of low cost converter for low and high speed operations. The scheme is successfully implemented with minimum number of switching devices and position sensors to control the speed of the switched reluctance motors in both the direction. This controller executes controller algorithms via micro-controller to generate SRM driving signal. ©2010 IEEE.Item Design analysis and performance characteristics of switched reluctance motor(2010) Uday Kumar, R.Y.; Shaik, A.A.; Deepika, K.S.R.Switched Reluctance Motor (SRM) is coming up as an alternative selection for variable speed drives in many automobile and industrial application. Its construction is simple and rugged. Its higher efficiency, high torque to inertia ratio and thermal toughness are some of the salient advantages of SRM. However, the SRM has not gained prominent importance in many practical applications, because of its few disadvantages like large torque ripple, acoustic noise and proper design. In this paper, the step by step design procedure of SRM is explained based on the previous literature available, for preliminary design. Finally the over all modifications and validations are carried out using finite element methods .Based on the design validations a proto type has been developed for automobile application .The experimental method verification of the motor winding inductance at different rotor positions from un-aligned to aligned position and ,the static flux linkage characteristics are also presented as they play an vital role in design verification and performance calculation of an switched reluctance motors (SRM's). The simulation results are having good conformity with the experimental results. ©2010 IEEE.Item An approach to reduce the size and cost of PV panel in solar water pumping(2010) Kappali, M.; Uday Kumar, R.Y.Of late Solar PV generation is finding prominence as a promising renewable source of energy. Water pumping is an important application of solar PV generation. However it suffers from the demerit that the initial cost is quite high which is mainly due to the high cost of PV panels. Present paper proposes a novel approach "Individual Floor Storage Method" for solar water lifting in multi-storied buildings. In this method water is pumped to the required optimum heights thus avoiding wastage of energy. Hence the energy required will be less for a particular amount of water to be lifted. This means there will be reduction in the size of photo voltaic panel and hence in the initial cost. In the present paper, solar pumping proposal without battery backup, is worked out for a house with two floors. It's found from the tests that with the proposed new approach, PV panel size and panel cost will decrease by 13% and 11.5% respectively. ©2010 IEEE.Item Harnessing maximum power from solar PV panel for water pumping application(Springer Verlag service@springer.de, 2013) Kappali, M.; Uday Kumar, R.Y.; Sheelavant, V.R.The problem of fast depleting fossil fuels is triggering exploration of alternate sources of electricity. Among such sources, Solar Photo Voltaic (PV) energy is gaining prominence due to its plentiful availability. Water pumping is an important application of solar PV power. However people are not opting for it in large numbers as the 'cost per watt' for solar pumping systems is high. The cost component can be reduced by harnessing more power per unit installed capacity of the solar panel. One method of realising this is by Maximum Power Point Tracking (MPPT) wherein a Power Electronic (PE) converter is used to match pump with the PV panel. Present paper deals with the MATLAB based simulation study of solar PV driven Permanent Magnet (PM) DC motor (brushed) Pump System. Two cases are considered: a) System without MPPT b) System with MPPT. It is shown that by varying duty cycle of the converter at different radiation levels, the pump speed and hence the useful mechanical output can be enhanced with MPPT. The simulation study reveals that the output power becomes the maximum when the motor voltage becomes the maximum. Hence it is proposed that the motor voltage can be used as a control parameter for varying the duty cycle of the converter in achieving maximum output. © 2013 Springer-Verlag.Item Role of smart meters in smart city development in India(Institute of Electrical and Electronics Engineers Inc., 2017) Patel, S.; Uday Kumar, R.Y.; Prasanna Kumar, B.Day by day in India we are moving towards technologies so everything started becoming advance. The proposal of smart cities in India has already came which include better way of urbanization. Smart meters are the key component in smart cities. Here we are going to discuss about how smart meters will be helpful in making our energy consumption as well as metering system smart. Concepts of smart cities and smart grid and how they are dependent on smart meters will be discussed here. Smart meters has brought big revolution in the fields of energy and power measurement. Worldwide at so many places smart meters has been already deployed but in India it is just starting of deployment of smart meters here some reports regarding that are also discussed. © 2016 IEEE.Item Harnessing maximum power from solar PV panel for water pumping application: A simple approach(2012) Kappali, M.; Uday Kumar, R.Y.Among alternate sources of electricity, solar photovoltaic (PV) energy is gaining prominence due to its plentiful availability. Water pumping is an important application of solar PV power. However people are not opting for it in large numbers as "cost per watt" for solar pumping systems is high and the reliability is poor due to complex technology. The cost can be reduced by harnessing more power per unit installed capacity of the solar panel. One of the methods of realizing this is by Maximum Power Point Tracking (MPPT) wherein a power electronic converter is used to match pump with the PV panel. Currently "panel power" is the widely employed control parameter for MPPT. This approach can be referred to as MPPTPP. Present paper proposes load voltage as control parameter for MPPT. Varying the duty cycle of the MPPT converter such that load voltage is always maximum leads to harnessing maximum power output. This approach can be referred to as MPPTLV. Here only one parameter i.e. load voltage needs to be monitored. MPPTLV is simpler than MPPTPP as in the latter case it"s necessary to measure both panel voltage and current and then find their product. The proposed method is substantiated by theoretical explanation followed by simulation as well as experimentation results. The system considered is a standalone PV source connected to Permanent Magnet (PM) brushed DC motor driving centrifugal pump.