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  • Users: okivrak
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  1. okivrak

    Drop-in transformer mounting method

    Hi everyone; I need to learn how drop-in type switched mode transformers are being soldered in wave soldering process. The specific application details are listed below: * The application is slim product of lcd tv. * Due to slim design, the power supply should also be slim !! * The maximum...
  2. okivrak

    Sawtooth generator with single op-amp

    Hi everybody Is it possible to obtain sawtooth signal output from a single op-amp with DC input voltage? I know that it's possible with 2 op-amps but my aim is to use just one. Could you recommend any circuit schematic or website? Thanks a lot.
  3. okivrak

    LV Cables Current Carrying Capability

    Could anyone send me a table or URL which includes current carrying capacities of copper conductors for low DC voltages. Specifically, i need a cable with 150V 1A carrying capacity. The cable should include multiple thin Cu conductors (1 mm thickness each)enclosed with pvc shield. For example...
  4. okivrak

    Limit Vcc of IC

    Hi everyone; I want to keep the supply to an IC within 8-20 volts interval while the possible DC supply occurs within 10-30 volts from a battery. I used a 2.4 volts zener diode in series with the Vcc pin of IC to achieve the lower limit 8V theoretically but unable to limit the supply to IC to...
  5. okivrak

    Temperature effects for Transformers

    Is there a graph indicating temperature vs. efficiency for a 1500 kVA 31500/400 V transformer?
  6. okivrak

    Starting Current of an IM while second is running

    Hello everybody; We want to use 2 squirrel cage induction motors connected parallel for a water pumping station. At normal operation, only one motor will be running, and if necessary the second one can be started. The rating of each motor is 370 kVA, 3-phase 380 V with minimum 0.85 PF. My...
  7. okivrak

    Electromagnetic Torque

    Is the efficiency of an induction motor the ratio Tout/Tin or Te/Tin or in other words; what is the difference between electromagnetic torque and output torque of an induction machine?
  8. okivrak

    Rotational Losses of Asynchronous Machines

    As known; rotational losses in an asynchronous machine includes; * Core Losses * Friction & Windage Losses * Stray Losses (Miscellaneous Loses) For an asynchronous MW size generator; are all the rotational losses constant for all operating conditions? In other words; can we say &quot...
  9. okivrak

    Moment of Inertia of Wind Turbines

    Can anyone help me about how to calculate the moment of inertia of an object? In my case, I want to find the moment of inertia of a 1.4 MW wind turbine rotating parts (high & low sped shafts, gearbox, generator rotor). Thank you.
  10. okivrak

    Flip-Flops

    Can anyone give me some links to learn about flip-flops, their working principles. Thanks
  11. okivrak

    induction machine formulation

    Anyone can help me to have induction machine formulations? My aim is to design an induction machine using its formulas. Thank you.
  12. okivrak

    Induction Generator

    I want to design an induction generator on MATLAB-Simulink for a wind power application. Can anyone tell a tutorial or a made simulation of induction generators? Their torque-speed response, design parameters etc. Thank You.
  13. okivrak

    How to use "To File" Block??

    Hi I'm trying to export output values from Simulink to an m-file. But although it seems OK, I couldn't be able to get data from m-file? Please explain how to use it or send an example file which I can check.

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