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  1. Replies
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    Re: Transformer and alternator

    You scored 0. All your points are wrong as i already explained above.

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    ................. :popcorn:
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    Re: Transformer and alternator

    It is a simulation, 3D computer generated animated simulation, to be precise.




    What else would alternating black/yellow squares be but alternating poles.

    Icecream maybe?
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    Re: Transformer and alternator

    You did not. You only made unclear references, you did not explain what you consider incorrect.

    If you are asking about polarity black and yellow squares are alternating poles. This is assumed.
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    Re: Transformer and alternator

    You first elaborate what is incorrect in the video.
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    Re: Transformer and alternator

    Video is NOT incorrect afterall.

    Video is right if we consider field first cuts the left side of the coil producing one polarity and as it crosses the center and starts to move away cuts another...
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    Re: Transformer and alternator

    Now that i looked into it better, we were right afterall and video is wrong.

    https://www.youtube.com/watch?v=L_m1mAY6WZ4

    As for my comparison of alternator with same poles and tranformer fed...
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    Re: Transformer and alternator

    It does show alternating current from the start. Look at the arrows representing the current flow.

    Unlike what you said and what i initially thought, polarity of the current flips as magnet starts...
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    Re: Transformer and alternator

    No, it is AC generator as it clearly states.

    South pole approaching produces the same voltage
    as north pole leaving and that is irrelevant in the context.
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    Re: Transformer and alternator

    You start with disagreeing and then you back that up with false claim. I thought that was the case too until i saw the video below. What happens is the exact opposite.

    As magnetic pole approaches...
  10. Re: How to correctly calculate coil's field strength?

    WOW, you actually managed to input few simple values into a simple formula i did not to happen to come accross, simpleton chimp.

    Let's see what's the actual resonance. If we take 10mH as actual...
  11. Re: How to correctly calculate coil's field strength?

    Inductance for 1 layer of this coil is 50uH, for 17 layers it is ~850uH or 0.85mH.

    For calculation i used this website kaizerpowerelectronics.dk/calculators/spiral-coil-calculator/




    What...
  12. Re: How to correctly calculate coil's field strength?

    LOL inductance of this coil is nowhere near 8.67mH.

    Reactance being 0 at resonant frequency is anything but "irrelevant".
  13. Re: How to correctly calculate coil's field strength?

    Seems you don't understand the meaning of reactance. Which 10mH are you talking about, where did you pull that from.

    If driven at resonant frequency, coil's capacitive and inductive reactance...
  14. Re: How to correctly calculate coil's field strength?

    Which part of no reactance you don't understand. At resonant frequency, only ohmic losses matter, no inductive or capacitive reactance.
  15. Re: How to correctly calculate coil's field strength?

    You're most welcome. Yes, i noted it is "only" 150 watt RMS.

    As for power dissipation in speaker coils, it is an interesting question, if you ask it at yahoo answers like i did you will get a...
  16. Re: How to correctly calculate coil's field strength?

    And that's what i referred to, your claim that they cannot dissipate more than 40 watts unassisted.



    They do heat up, but rarely to a point of being hot. Only if driven at high power for long...
  17. Re: How to correctly calculate coil's field strength?

    Qustion is about flux density, not heat dissipation, but since you insist on it, how do you think 1Ohm or even 0.5Ohm speaker coils dissipate heat if they are not able to dissipate more than 40 watts...
  18. Re: How to correctly calculate coil's field strength?

    I am aware of that, that's why duty cycle will be 50% or less, but that's irrelevant for my question.

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    Dimensions 110mm x 23.8mm 425 turns, same current, same gap in the...
  19. Re: How to correctly calculate coil's field strength?

    Yes, 50 amps. It's assumed we are talking DC,
    duty cycle and frequency (and thus power) are totally irrelevant in the context.
    I am looking for flux density, will it be on for a 10% or 100% of the...
  20. Re: How to correctly calculate coil's field strength?

    Last days i been in vain trying to find a company that would sell copper or aluminum flat wire in smaller amount, i contacted every company on Alibaba, Indiamart, few rare companies that make such...
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    Re: How to correctly calculate coil's field strength?

    You reply is useless as usual. Read the question again.

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    I think the answer lies in the fact that transformer action - primary field building up and collapsing is akin to...
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    Transformer and alternator

    I got one simple question which i'm sure you will find easy to answer.

    Namely, if we feed transformer with pulsed DC, output is AC as demonstrated here:
    ...
  23. Re: How to correctly calculate coil's field strength?

    Very nice, tnx again. May i ask which software you use?
  24. Re: How to correctly calculate coil's field strength?

    Oh ok, tnx. I don't wanna bother you, but just once more please.

    What is the field for diameter 13.6cm, height 3.6cm, 540 turns, same amps.
  25. Re: How to correctly calculate coil's field strength?

    Yes!



    Nice.



    Whould you please try the last config i asked.
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