gibbon Posted October 2 Share Posted October 2 Got a little engine here, battery isn't charging It's got some funky brushless generator in it where the permanent magnets are mounted in a casing and spin around a fixed coil. Output is good but is in AC. the output wiring is very light, I doubt it produces more than 15A There's no part numbers or anything on it or anything. I'm after a single unit that will both act as a rectifier, and as a "down stream" regulator, ie dropping output down to 14 volts without having access to a field input. wondered if this is quite a normal little generator in certain circles and if anyone is familiar with the regulators for them? Quote Link to comment Share on other sites More sharing options...
Goat Posted October 2 Share Posted October 2 Should be able to use a motorcycle regulator/rectifier. They usually take 2 or 3 AC inputs, and have a ground and a Bat +ve output. They often need a battery connected before it outputs anything though. Anything from 40-60v AC is what motorcycle stators usually put out. So if your output is that, then a bike reg/rec might be the go. Quote Link to comment Share on other sites More sharing options...
gibbon Posted October 2 Author Share Posted October 2 hmm not sure about that, this thing is a true PMG, it has no input capacity whatsoever. just spinning magnets Quote Link to comment Share on other sites More sharing options...
Goat Posted October 2 Share Posted October 2 Motorcycles come mostly in the arangement above (no input, just 2 or 3 outputs depending on how the stator is wired/specd) Often the Permanent magnet rotor spins inside a fixed coil, but others have a permanent magnet flywheel that spins around a static coil. These are usually 2 or 3 phase stators. Doesn't need any field charge to get an output. The reg/recs just take that 2 or 3 phase ac and turn it into 12/14.4 volt output. There is no input or feedback to the stator which is unlike normal alternators or dynamos. 2 Quote Link to comment Share on other sites More sharing options...
gibbon Posted October 2 Author Share Posted October 2 30 minutes ago, Goat said: Motorcycles come mostly in the arangement above (no input, just 2 or 3 outputs depending on how the stator is wired/specd) Often the Permanent magnet rotor spins inside a fixed coil, but others have a permanent magnet flywheel that spins around a static coil. These are usually 2 or 3 phase stators. Doesn't need any field charge to get an output. The reg/recs just take that 2 or 3 phase ac and turn it into 12/14.4 volt output. There is no input or feedback to the stator which is unlike normal alternators or dynamos. oh sorry I thought you said the generator needed an input, re-read it now and gotcha. Can you give a link to a suitable regulator? thanks Quote Link to comment Share on other sites More sharing options...
h4nd Posted October 2 Share Posted October 2 Watch for the 70s / 80s Suzuki regulators (eg RG 250). They had the 3 phase rectifier, then each cycle when a phase reached regulating volts, they'd just short circuit that winding with a big fat SCR (a solution with cheap electronics parts). Fine if the gen/alternator is designed for it, just makes a bit of heat in the wire/regulator - not sure how you'd check a random gen is suitable for that... 1 Quote Link to comment Share on other sites More sharing options...
h4nd Posted October 2 Share Posted October 2 These days, 25A rectifier, a few thousand uF capacitor and a cute little AliExpress switch mode Buck regulator: easy. Quote Link to comment Share on other sites More sharing options...
Goat Posted October 2 Share Posted October 2 Any of the new style reg recs should be fine. Just search ali for reg/rec. And get something that looks like this: Make sure its either a 4 wire if your stator has 2 outputs or 5 wire, if your stator has 3. yellow or white are usually the AC inputs, and you'll need 2 or 3 of these. Then its a bat + and a ground. Usually handle some pretty decent amps 1 1 Quote Link to comment Share on other sites More sharing options...
Muncie Posted October 5 Share Posted October 5 Honda GX engines have this style charging system mainly to top up the starting battery very simple hook up and cheap. On bigger engines you can add more coils to raise output. Quote Link to comment Share on other sites More sharing options...
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