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    • CommentTimeOct 27th 2016 edited
    Hey all,  
    Just signed up because I'm working on a way to turn a shaft (with magnetic force) that turns the crank on an alternator. I've learned a lot and now know that the alternator obviously cannot be expected to spin at it's factory 1,000-2,000RPMs. So I've found some information on customizing its "Stator" which can supposedly get a 12-14v output at 125RPM (supposedly)  
    My source for customizing the stator is here:  
    Looks like there's an MIT paper on the alternator concept here:  
    Only they where using a water mill to turn the crank.  
    I also found a low RPM wind power alternator that would work but it's awfully expensive.  
    ( the DC-540 for $199.00 )  
    I'm looking for any information on what would be the very best alternator brand / model / specs to use in order to charge a series of batteries.  
    And even more specifically, where I can get a stator that will output voltage at 125ish RPMs.  
    I know I can turn a shaft with magnets faster than 130RPM so this really interests me.Currently working on a free energy project
    • CommentTimeOct 28th 2016
    If you are charging batteries in series, what voltage output from the alternator are you hoping to achieve. Normally an alternator adjusts its output voltage according to the voltage level on a single battery. There are commercially available devices which can be wired in to an alternator to optimize their performance charging specific types of batteries. If memory serves the field voltage is adjusted to control the output voltage and current from the alternator. The field coil must be energized to get anything from an alternator.

    When using alternators it is normal to connect batteries in parallel not series. The problem with arrangements connecting batteries in series or parallel is that if one of your batteries starts to fail for what ever reason it is not easy to detect. When connected in parallel diodes are often used to prevent batteries discharging into each other. When connected in series the overall output of your batteries will be limited to the output of your weakest battery. Ie with a 6Ah battery connected in series with a 100Ah battery, you will be limited by the 6AH battery capacity.

    What exactly are you trying to achieve?
    • CommentTimeOct 28th 2016
    Why not just change the pulley to get the correct ration