Recent content by n.karthick

  1. n.karthick

    Field Oriented Control Clarification

    Hi, The controller is normally designed in such a way that it acts like a mirror image of the physical system it is going to control. In this case, the physical system i.e, the motor takes voltage as input and its response is measured as current. We know the mathematical model of the motor...
  2. n.karthick

    DC Drive rating to run DC Shunt Generator

    You may need to consider the losses in the motor (its efficiency) while calculating the required motor rating for your generator.
  3. n.karthick

    Simulink help for getting a frequency I can use as an input

    Hi, You can use PLL block in Simulink to find the frequency of the signal. Both single and three-phase PLLs are available in Simulink.
  4. n.karthick

    Three phase supply

    The phase means the angular difference between the sinusoidal voltage on one wire to another. For three phase, the angular difference would be 360/3 = 120 deg. Instead of having three independent single phase transmission system which require (phase + neutral wire for each phase) 2*3 = 6 wires...
  5. n.karthick

    Three phase circuits

    The arrow denotes the sign of voltage induced in the winding when current flows in that direction. For example if current flows from terminal n to R, the voltage across the winding denoted by VnR is positive.
  6. n.karthick

    How not to get stuck up with one approach?

    Hi, I am used to do things independently in my life and rarely takes the advice of others. The one important problem I often face is, whenever I try a method i always stick to it even if it doesn't work. I try to fight with the same approach to find solution to the problem in hand. Though I am...
  7. n.karthick

    Horoscope and its effects on marriage

    Hi I am from India, a Hindu by birth (Hinduism is a religion). Here horoscope match is considered essential for marriage. My horoscope was found to be bad since it contains http://en.wikipedia.org/wiki/Mangal_Dosha" [Broken] (Mars danger) and naga dosha (snake danger). It is believed that if a...
  8. n.karthick

    Engineering How will having a master's degree in engineering change your career path ?

    I dont know about the status in your country. But I can say my experience in India. After completing my bachelor's degree in electrical engineering, I was able to get job as an electrical engineer. But the job profile was operation and maintenance of electrical machines in an aerospace...
  9. n.karthick

    Is it correct to give top priority for survival in academics?

    Yes, I discussed with my Prof. and requested him for making a simplified version of my big problem so that I can finish within in a month or so. But at this moment I don't have time to complete my original problem as such. But my inner consciousness always says that I am doing wrong. I am...
  10. n.karthick

    Is it correct to give top priority for survival in academics?

    Hi, I am a postgraduate student doing Master of Science(by research) in a reputed Institute in India. I registered for my course on January 2008 and I have not yet completed my course. The requirement for completion of this course is to get a research paper published in reputed journal...
  11. n.karthick

    Controllability Problem

    The variables A and B need not be symbolic variables. Just declare A and B as double floats and use ctrb function. It worked for me.
  12. n.karthick

    Drawing electric charge from the earth

    Why it will draw charge from earth? already the the capacitor and resistor are at zero potential. There is no closed path in the circuit and hence the capacitor cannot get charged. The law of conservation of energy has to be kept in mind. Work has to be done to charge a capacitor. Where does...
  13. n.karthick

    How to evaluate this indefinite integral?

    why cant u take x^3 inside square root. Then it will be simplified to sqrt(1-x^2)/x which is easier to integrate
  14. n.karthick

    Matlab: How to get the PSD of a signal?

    Which version of matlab you are using? i am using matlab 7.8 R2009a. In my version I have a function called 'dspdata.psd' in signal processing toolbox to find psd of input data.
  15. n.karthick

    Units of FFT in matlab

    The units of FFT will be in volts only as you mentioned but i dont know the procedure to get it in terms of other units.
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