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  • shylo
    replied
    Voltan & Alterz, You were both right ,I always assumed an Ac output so I never checked Dc . Sorry for that.
    Matt ,I spun the new wound motor with 20 volts from a cordless drill battery, the new motor was coupled to the old wind motor , which served as a generator. It was putting out 30+ volts.
    The only thing is the windings in the old motor are much finer and more of them, than the new.
    The coupling is not very good , bad vibrations ,if I can get it to run smoother I will try charging a 2nd battery ,then swap them around.
    I'll also try the 3Bgs.
    The more this new motor runs the better it's getting(amp draw dropping had it down to 1.5), just breaking in the brushes.
    None of my stuff is new just reused, so a little ruff.
    Thanks for All your help.
    artv

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  • voltan
    replied
    hi shylo. i think maybe the dc motors that you were getting ac output with were brushless like bedini,ssg.alternating pms on the rotor,no commutation on the stator coils.when there's brushes in a dc motor they commutate,switch the power to the winding/s on the rotor based on it's points of rotation, relative to the fixed pms in the housing.the same timing system that makes it a dc motor rectifies the ac on the winding/s when it's a generator. an image search of brushed dc motor commutation should clarify things.
    cheers.

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  • altrez
    replied
    Originally posted by shylo View Post
    Hi all, Just out of curiosity when you take Matts' motor and spin it with a drill why does it put out dc?
    It should be an ac output without a bridge no?
    The magnets in the case are nsns this should make ac not dc?
    artv
    My stock motor outputs DC I posted that in the thread at some point.

    -Altrez

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  • altrez
    replied
    Originally posted by shylo View Post
    Hi Voltan, I have spun many dc motors with many different types of supply.
    They always put out an AC voltage, the only way that I have gotten DC was to run it through a diode bridge.
    But Matts winding puts out straight DC, Maybe because of the pulsed input?
    I don't know.
    I have no clue how a commutator could produce DC ,it should show a positive value then a negative value, since the windings are seeing a north pole then a south.
    There's alot I don't know ,maybe this is one of them.
    Thanks artv
    My off the shelf Razor scooter motor my1016-B outputs DC no modifications needed.



    -Atrez

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  • shylo
    replied
    commutator

    Hi Voltan, I have spun many dc motors with many different types of supply.
    They always put out an AC voltage, the only way that I have gotten DC was to run it through a diode bridge.
    But Matts winding puts out straight DC, Maybe because of the pulsed input?
    I don't know.
    I have no clue how a commutator could produce DC ,it should show a positive value then a negative value, since the windings are seeing a north pole then a south.
    There's alot I don't know ,maybe this is one of them.
    Thanks artv

    Leave a comment:


  • voltan
    replied
    hi shylo. the commutation rectifies the output.your speed v amps account is a bit of a puzzle to me.maybe a couple of pics and a diagram could give some clues.maybe if you power it with a battery and a switch,just the 3,nothing else connected,it might respond to timing changes in a more predictable way. maybe powering it with the cap bank is creating variables in the rpm/ input current relationship. or maybe i should leave it to matt or dave to comment.
    cheers

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  • shylo
    replied
    dc voltage

    Hi all, Just out of curiosity when you take Matts' motor and spin it with a drill why does it put out dc?
    It should be an ac output without a bridge no?
    The magnets in the case are nsns this should make ac not dc?
    artv

    Leave a comment:


  • Turion
    replied
    Inverter

    Nikola-wan,
    The bridge might protect, but I haven't tried it, so I don't know and not going to pretend I do. Don't like giving advice on something I haven't tried myself. Hate to see you smoke an inverter. I have a couple of those already and it can get expensive.
    Dave
    Last edited by Turion; 01-17-2015, 06:22 PM.

    Leave a comment:


  • shylo
    replied
    amp draw

    Hi Matt , the lowest amp draw is 2.25 dc amps. The highest was 4.5 as I rotate the brushes.
    I don't know rpm but at 4.5 the motor is quite a bit faster.
    I was running off 15 volts from cap bank.
    Just letting you know.
    Thanks artv

    Leave a comment:


  • nikola-wan
    replied
    Originally posted by Turion View Post
    I should mention that the universal motor I had running on battery three was my shop vac, plugged into an inverter. And remember what I said about inverters. When the polarity flips you will probably let the smoke out of one if it is attached.
    Dave
    Dave,

    If the inverter was connected to the output of a full wave bridge rectifier - wouldn't that protect it against battery 3 voltage reversal? I know the diodes in the bridge would add a voltage drop - but Iike your idea of using the inverter to drive the larger loads.

    Monty

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  • shylo
    replied
    wire guage

    Hi All, I wound up another 16 pole , 4magnet can ,it's not an myi6...
    I didn't have enough 24awg, But I did have some heavier wire not sure of the awg I think it to be around 15-16awg so I only used a single strand.
    It measures just under a mm with a tape, (not even sure that's accurate)
    My question is , where should the coil be in relation to the magnets when the firing sequence starts?
    I can rotate my brushes , so just find the spot where it runs fastest?
    Thanks artv

    p.s my boats' got a major leak, going down quick

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  • voltan
    replied
    hehe.now you got it.
    Last edited by voltan; 01-17-2015, 05:15 AM.

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  • voltan
    replied
    apologies.was an attempt at humour.maybe got lost in translation.i'm broke arsed too.

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  • voltan
    replied
    i'm clinging on to a bit of driftwood.

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  • Zardox
    replied
    I don't have anyway way of measureing RPM. I know it was not going as fast as the stock wind.

    Leave a comment:

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