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  1. azzmi

    DC motor to charge battery

    hi, i like to know about the kind of mechanical power source to excite your generator? is it wind or stream etc.? Azmi Demirel azzmi@elk.itu.edu.tr http://www.elk.itu.edu.tr/~azzmi
  2. azzmi

    Best motor for an EV? with no limitations

    Hi JBartos, I think your references are a little bit out of date, because a DC motor only means to you as a brush type DC motor. Also, Switched Reluctance Motor is one of the oldest motor which is used on earth. (Maybe I'm wrong, in former British navy, to align big cannons to the target)...
  3. azzmi

    Best motor for an EV? with no limitations

    Thanks for your immediate answer, 1. More readily available power supply I dont think so.. Don't forget, it is working on an electric car.. I mean If it is not a hybrid car (I mean a petrol engine coupled with an AC generator), probably it has a DC power bus. (for example an accumulator or a...
  4. azzmi

    Best motor for an EV? with no limitations

    Hi Jbartos, Why do you think an AC motor is better than a DC one? Can you explain these reasons? <p>Azmi Demirel<br><a href=mailto:azzmi@elk.itu.edu.tr>azzmi@elk.itu.edu.tr</a><br><a href=http://triton.elk.itu.edu.tr/~azzmi>Welcome</a><br>I am handsome but married :-)
  5. azzmi

    Best motor for an EV? with no limitations

    OK., In my opinion the brushless DC Wheel motor is the best.. (I still think it is not easy to make a strict choice).. <p>Azmi Demirel<br><a href=mailto:azzmi@elk.itu.edu.tr>azzmi@elk.itu.edu.tr</a><br><a href=http://triton.elk.itu.edu.tr/~azzmi>Welcome</a><br>I am handsome but married :-)
  6. azzmi

    Heat to Power Equations

    Hi Simon, I think, first of all, we have to calculate the total electrical power loss which is dissipated in your battery at its operation conditions. For this calculation, the internal resistance of the battery must be determined. Simply you can make two measurements to determine roughly the...
  7. azzmi

    Best motor for an EV? with no limitations

    Hi Gleen, If there is no limit for electrical power supply, some additional limitations come through. These limitations are, -Weight of the motor. -torque-speed characteristics of the motor. (Especially high speeds). -maintenance needings of the motor. -Acoustic noise of the motor. -Vibration...
  8. azzmi

    Rough Starting/Running Variable Speed DC Motor

    Hi, First of all if you have an oscilloscope, I recommed, check the motor's armature voltage waveform. This will help to point the problem comes from the controller or the motor. Ah, I missed a thing, is your motor a brushless PM motor or a classical commutator DC motor without excitation...
  9. azzmi

    Heat to Power Equations

    Hello Jbartos, Your second post is correct. But if you make some basical mathematic operations on your result, you will see that; a kilowatt-hour is equal to 859 kilocalories. And even this form of equation may be more useful for which cases are electrical power is known. The equation that you...
  10. azzmi

    Heat to Power Equations

    Hi, I don't know if is it useful for your case but, 1 kilowatt-hour is equal to 859 kilocalories or 3413 BTUs. But your case is not easy because you have to know the thermal capacitance of your physical system. Regards,
  11. azzmi

    RESISTOR TYPE FOR INDUCTIVE CIRCUIT

    Hi,<br>John, would you compare non-inductive wirewound resistors with the other types (metal or carbon film resistors and even water resistors). Is the bifilar construction the best (by mean of parasitic inductance)? <p>Azmi Demirel<br><a...
  12. azzmi

    RESISTOR TYPE FOR INDUCTIVE CIRCUIT

    Hi,<br>I don't think it is true. In my opinion opposite of this comment can be true. I mean the wirewound resistor is the worst for a non inductive circuit because of its big parasitic inductance.(if you don't want to add some serial parasitic inductance to your circuit.)<br>I think the main...
  13. azzmi

    Motor full load amps

    Hi,<br>In general the current rating which is on the name plate is given for continuous operation. <br>Regards<br> <p>Azmi Demirel<br><a href=mailto:azzmi@elk.itu.edu.tr>azzmi@elk.itu.edu.tr</a><br><a href=http://triton.elk.itu.edu.tr/~azzmi>Welcome</a><br>I am handsome but married :-)
  14. azzmi

    osciloscope

    Hi,<br>I like to make a little addition.<br>your voltage is 400 volts, that means approximately 1200 volts peak to peak. This voltage stress may damage the input<br>stage of your oscilloscope. (Check your scope's manual if available). So, you better use an attenuator (X10) probe. (Don't forget...
  15. azzmi

    PROJECT IDEA

    Hi,<br>I think you have to use your own creativity. But as a hint,<br>maybe it will be useful to browse some universities web pages for some impression. Don't forget, this project is necessary for your evaluation.<br><br>Regs <p>Azmi Demirel<br><a...
  16. azzmi

    motor vibration non-repeatability

    Hi,<br>Motorman, you are right all about an unbalanced system. Maybe I'm wrong but if there is a balance problem, I think the vibration must be repeatable. <br>Regards, <br> <p>Azmi Demirel<br><a href=mailto:azzmi@elk.itu.edu.tr>azzmi@elk.itu.edu.tr</a><br><a...
  17. azzmi

    motor vibration non-repeatability

    Hi<br>Actually, I don't have any experience about this subject. But I like to tell you my opinion. According to the symptom,<br>I don't expect an electrical problem. I think the lubrication system and bearings must be checked first.<br>Regards. <p>Azmi Demirel<br><a...
  18. azzmi

    reversing induction motor

    Hi,<br><br>would you explain what you mean by overloading? I think you mean a bigger current than motor's nominal current. An another question, how do you change the rotation direction of the motor? Finally, what is the nature of the motor's load? or it work idle?<br>Regards.<br> <p>Azmi...
  19. azzmi

    Power Factor

    <br>Hi,<br>I think there is a mistype about the definition of the power factor. The active power is equal to PF times apparent power.<br>You are right, when the harmonic components get into the account, the calculation of the power factor gets more difficult. <br><br>Such as non sinusoidal...
  20. azzmi

    Power Factor

    Hi,<br>Here some values for induction motors. First value is rated power, second is PS, third is efficiency (%) and the last is power...

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