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  1. M

    How are harmonics produced and how they affect electrical system?

    Re: harmonics regarding their effects on power systems, harmonics affect the PS :- 1- higher losses " transformers, motors ,...etc" 2- parasitic torqus in motors, 3- telecomunications interferecne. 4- aging of equipment. 5- protective gear mal-functioning " nuissance tripping ". 6- voltage...
  2. M

    capacitor in series with a light bulb

    capasitor series with bulb The steady state value for current in a DC Circuit composed of a capacitor series with resistor " bulb " is zero, but, during the transiet period, the current has an exponential decay from a peak value " =E/R " and decays to reach zero in some multiples of a certain...
  3. M

    Why the power mosfet in this circuit blow-up?

    Yes, it is very enough, i just thought this as a common failure mode for Mosfets and IGBTs. I think a loose connection to the mosfet gate can cause bolw-up due to arbitraty firing " noisy ".
  4. M

    Why the power mosfet in this circuit blow-up?

    The circuit as shown has no switching driving ciruit to drive the mosfet gate, , as u connect the gate to the 12 v positive of the battery , means that the motor operates continously, i.e. no inductive overvoltage will happen,. This makes the o.v. cause out of occurance, i think the mosfet...
  5. M

    power electronics simulation software

    power electronics simulation program Simulink associated with MATLAB seems very good and versatile to simulate power electronics systems espeacially motor loaded, u can check a lot of demos prepared in Simulink help
  6. M

    Forced Commutated Systems

    force commutated thyristor circuits Hi, Forced commutation is used in order to force a thyristor to turn-off. It is used mainly in thyristor circuits as thyristors can't be turned off by gate control " GTO is an improved limited application thyristor with can be commutated by negative gate...
  7. M

    I need help choosing proper filter for PLL design

    PLL Filter Design"? Hi ALL, I use "4046 Chip " as a PLL with a reference frequency of 50 Hz " Power Frequency" with a divider in feedback N=60 "two 4017 Chips" and using Phase Comparator 2 to obtain zero degree phase shift between input and output when in lock, the VCO is a wave generation...
  8. M

    I need some commercial advice about technical software

    Hi, I am planning to produce a software that help in electrical design automation., but, i want to know the trends available for me to market and sale this software commercially and protect it...any advice???
  9. M

    can you solve this interesting problem?

    Indeed Wanli I thank u and flatulent for this problem,it is an impressive one, i may test engineering students using this problem!!
  10. M

    can you solve this interesting problem?

    Thankx flatulent, the same answer achieved..
  11. M

    can you solve this interesting problem?

    ok wanily let's check this series i made to represent your case from right meshes:- R(i)=(((R(i-1)+2R)*R)/(R(i-1)+3R) R(0) = R Take R1 = 3/4 R R2 = 11R/16 ... The values will decrese getting R (∞) will be if we put X= R(i-1) tends to zero resulting in R(∞) = 2/3 R From left the same both...
  12. M

    can you solve this interesting problem?

    paralling an infinite number of resistors with a resistance R will result mathematically into an equivalent resistance value equals to 2/3 R, here is the conclusion :- for a 3 resistors Xi,R,R parallel with a resistor R , the equivalent value will be : =((Xi+2R)*R)/(Xi+3R) For a series with X...
  13. M

    What is the relation between system capcity and impedance?

    What is the relation " Math. " between the system " source, bus-bar, Generator, DC Supply, .." capacity (S) and the internal impedance of it?. Any system has an internal impedance which isn't zero, which means any current drained from it , will make a voltage drop and regulation then arises, is...
  14. M

    How can I size a cable for a motor?

    Hi all How can i size a cable for a motor?i mean do i have to multiply the rated cuurent by a factor to compensate the starting current capacity heating for the cable?
  15. M

    Where to put the driving motor for automated gate system?

    Re: Gates Automation Hi techie, thanks for this help, but, the hydraulic gates needs a pump or jack, this will be electrically initiated.
  16. M

    Where to put the driving motor for automated gate system?

    Re: Gates Automation awaiting more discussions!!
  17. M

    Where to put the driving motor for automated gate system?

    Gates Automation Hi all, I need to start a work into gates automation. after modeling the gate system as an inertia element depending on gate weight and geometry, i didn't decide yet where to put the driving motor, two assumptions for me are available:- 1- Under the pivote axis , the motor will...
  18. M

    Electrical conductivity of salt water

    U can measure it using any of the following 1-Hot wire ammeter. 2-Clamb ammeter. any one knows any more!!??
  19. M

    dc motor parameter estimation?

    calculate dc motor parameters Sensorless feedback control depends on accurate mathematical dynamic equations that describes the Motor and Load. Electrical equations coupled to the mechanical equations describes the matrix of operation for the drive core microprocessor. E=KN K depends on :-...

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