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Updated on July 7th 2005.

 

Murali Krishna Uriti

Research Engineer (Brush Less DC Drives)

R&D Center

Samhyun Co Ltd

Palyong-Dong

Changwon City

South Korea

Contact: +82-10-71979695( Mobile)

 

Email: umurali2000@yahoo.com

Sex: Male

Language Known: Telugu, Hindi, English, Bengali, and German

Date of Birth: December 20, 1979

 

 

M.E in Power electronics and Drives with Two year Experience in Electromagnetic analysis(FEM based ) , design and development of Brushless DC Drives(Motor and Electronics)

 

 

Objective

For a position wherein I can bestow my academic competence, expertise and to prove my abilities to the respected areas of my interest.


Academic Profile

i)                    Master’s in Electrical Machines and Power Electronics from Jadavpur University, Kolkata. (Completed with 74% during 2001-2003).

ii)                  Bachelor’s in Electrical Engineering from Andhra University, Waltair (Completed with 69% during 1997-2001).


Work Experience

Company: R&D Center, Samhyun Co Limited, South Korea

Homepage: www.samhyun.co.kr

Designation: Research Engineer, Brushless DC Drives for Automobile and Electric Vehicle applications.

Duration: From May 2005 till date.

 

Work Experience

Institute: Indian Institute of Science, Bangalore.

Homepage: www.iisc.ernet.in

Designation: Project Associate.

Duration: Oct 2004 till April 2005.

Working Area: Design and development of protective and feedback circuitry for High power Electric drives. 

 

Work Experience

Company: Corporate R&D and Quality, Crompton Greaves Limited, Mumbai.

Homepage: www.cglonline.com

Designation: Technology Executive, Permanent Magnet Drives.

Duration: From May 2003 till Oct 2004.


 

Working Area and Capabilities: Design and Development of BLDC drives (Both electronics and Motors). Currently involved in Design, development and FEM based electromagnetic analysis of BLDC motors.

 

Capabilities

  • Able to develop BLDC motors independently for the required specification from scratch.
  •  Able to predict accurately the performance of BLDC drives, PM generators using Magnet software (FEM tool for electromagnetic analysis) and PC-BDC (for BLDC motor dynamic analysis)
  • Good understanding of Power electronic system in relation to BLDC drives and hands on experience in Orcad Pspice.
  •  Can Evaluate different magnetic materials and find the suitability of for the applications.
  • Having basic knowledge in implementing Design for Six Sigma, QFD and FMEA for product development process.
  • Good Communication, Presentation and Documentation skills.

 

Projects completed in Crompton Greaves Ltd

§         Prediction of performance of BLDC motors done using Electromagnetic analysis (FEM tools) on BLDC products and validated them experimentally.

§         Devised a reliable design procedure for BLDC motor by integrating Magnet 2D and PC-BDC packages.

§         Devised the different processes of evaluation of permanent magnets for using them in BLDC applications.

§         Designed and developed the Cost effective designs for two existing BLDC motors using FEM tool and placed in divisions.

·         Designed and predicted the performances of the motor for submersible pump application. Modification is to be done based on the design for six-sigma tool.

§         Designed power supply unit for a remote controlled Fan regulator using Fly-back topology and simulation done using Orcad Pspice.

 

 


 

Skills set

·         Design tools like JMAG Electromagnetic solver ,Magnet 2D with motion solver, PC-BDC 2.7 and Motor Pro .

·         Modeling and simulation tools: Orcad Pspice , SABER,SIMULINK.

·         Programming languages: C and Assembly language programming for 8085.

·         Experience in modeling in AutoCAD, and IntelliCAD

·         Attended training in for FEM tools like FLUX 2D, ANSYS and aware of basic modeling in those packages.


M.E thesis: Microprocessor Controlled PWM Voltage Source Inverter.

A sinusoidal Pulse Width Modulation (SPWM) based Voltage Source MOSFET based Inverter that drives a Three Phase Induction Motor is presented in the thesis.  The selected chip is SA828 by MITEL Semiconductors, is interfaced with 8085 Microprocessor and programmed in a specified manner we can obtain six SPWM pulses from MITEL SA828 chip.

These pulses were used to drive the gate terminals of MOSFETs in the Inverter circuit. This is loaded with Induction Motor and studied its characteristics. The DC supply to the inverter is fed from Three Phase Diode Rectifier .The above process is practically implemented and was done PSPICE simulation.

 


Course work:

i)                    Analysis of electrical machinery

ii)                  Principles of Electromagnetism

iii)                 Design and Analysis Brushless DC motors

iv)                Power Electronics and Drives

v)                 Special and Incremental motion devices

 
Academic achievements:
  • Got the South Korean Government Approval and Sponcership for the Job in Korea
  • Secured scholarship of Free Education, lodging, and boarding by state government of Andhra pradesh for 12th standard.
  • Secured state 224th rank in AP polytechnic common entrance test.
  • Qualified in the Graduate Aptitude Test in Engineering (GATE) for admission to the postgraduate study in India Electrical Engineering with a score of 89.75 percentile.

 


                                                                                   

 

Projects in Crompton Greaves ltd  completed in chronological order

§         Designed and developed a power electronic instrument for Partial discharge detection in motor insulation system.

Now a days Inverter Fed Drives are facing the problem of voltage surges at the input of the motor winding due to long cables used for connecting inverter and motor. So in order to confirm the applicability of IM to the inverter feeding during the manufacturing stage itself, an instrument is to be designed. This instrument is power electronic based which will simulate the actual surge condition at high frequency. Due to the high frequency surges, If the partial discharge is detected will prove the destruction of the insulation system of the motor. This instrument is MOSFET based which give 5KV and operating at 1KHz frequency. This was been simulated using SABER.

 

§         Designed power supply unit for a remote controlled Fan regulator using Fly-back topology and simulation done using Orcad Pspice.

A power supply unit for the control and power units of a remote controlled regulator circuit was designed. The design is based on Fly-back converter topology. This circuit was simulated using Orcad Pspice.

 

§         Prediction of performance of BLDC motors done using Electromagnetic analysis (FEM tools) on BLDC products and validated them experimentally.

 This project is being done in order to improve the level of Technology in CG in related to BLDC products. The BLDC products include motors and magnetizing fixtures. This research consists of the finite element analysis (Magnet 2D) of Electromagnetic field in a BLDC motor. In this paper different processes of evaluation of permanent magnets are given. Complete prediction of Flux linkage, Back-EMF and torque waveforms of the BLDC product was done. The simulation results are in agreement with the experimental results. This helps to better understanding of the BLDC technology and optimizing the design and reducing the lead-time of a project in R&D.

 

 

§         Devised a reliable design procedure for BLDC motor by integrating Magnet 2D and PC-BDC packages.

A design procedure was devised and validated for BLDC products based on integrating both field and lumped parameter approach. Here the field approach is Magnet 2D and lumped parameter approach is PC-BDC program.

 

·        Devised the different processes of evaluation of permanent magnets for using them in BLDC applications.

This is done in order to evaluate the suitability of the permanent magnets sent by our vendors to our applications. Different processes are devised using Magnet 2D package and validated experimentally.

 

Projects Till October 2004.