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ceengland7(at)gmail.com
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 Posted: Mon Oct 30, 2017 1:03 pm Post subject: homebrew alternative to Ducati, etc regulators?? |
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With all the regulator failures on Rotax (insert version here)
regulators, I've been wondering about whether the job could be
accomplished using a different tack.
What about a diode bridge using diodes that can handle the higher
frequencies being generated by the 'wild' output from PM dynamos,
followed by a 'buck' style switching regulator that could withstand the
fairly high DC voltage that would result from high rpm and low load.
Both the diode bridge and the 'switcher' might well be off-the-shelf
items, that could be wired together to get a very high efficiency DC
output. If I've been correctly interpreting some of the data on the
traditional regulators, their efficiency is atrocious (which probably
helps explain the horrible failure rate). A bit of filtering might be
required to clean up the switcher's noise, but the idea seems worth
exploring. If I had a dog in the hunt, I'd certainly take a shot at
something like that.
Charlie
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Mon Oct 30, 2017 8:39 pm Post subject: homebrew alternative to Ducati, etc regulators?? |
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There are lots of dynamos on lots of motorcycle engines, tractors and industrial engines. Surely there must be an RR out there from the likes of John Deere, Kubota, or Harley Davidson. If not there then the aftermarket has units from Accel, Custom Chrome, JP Cycles or Dennis Kirk just to name a few.As an aside, the first thing you learn when you work on Rotax engines is that the first place to look when there's a problem is how the owner deviated from the engine's Installation Manual.
Just sayin'
Rick Girard
On Mon, Oct 30, 2017 at 9:58 PM, C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)>
Charlie, I agree that 80 watts dissipation while outputting 240 watts of power is not impressive. I suspect it is tough to do a lot better on a 12volt system though. 20 amps through any full wave silicon bridge arrangement is perhaps 30 watts lost and I'd guess at least another 20 watts from the buck converter inductor, mosfet(s), and diode. Such a commercially built converter would be larger and more expensive compared to existing after market offerings. Advantages should include a couple more amps of output and a I think a generally cooler running stator.
I cobbled together a 50khz dc/dc buck converter for a 120 volt solar array for perhaps $30. of parts so a homebrew should be doable if one really wanted to. The output from my unit is electrically fairly noisy.
Ken
On 30/10/2017 5:06 PM, Charlie England wrote:
| Quote: | --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
With all the regulator failures on Rotax (insert version here) regulators, I've been wondering about whether the job could be accomplished using a different tack.
What about a diode bridge using diodes that can handle the higher frequencies being generated by the 'wild' output from PM dynamos, followed by a 'buck' style switching regulator that could withstand the fairly high DC voltage that would result from high rpm and low load. Both the diode bridge and the 'switcher' might well be off-the-shelf items, that could be wired together to get a very high efficiency DC output. If I've been correctly interpreting some of the data on the traditional regulators, their efficiency is atrocious (which probably helps explain the horrible failure rate). A bit of filtering might be required to clean up the switcher's noise, but the idea seems worth exploring. If I had a dog in the hunt, I'd certainly take a shot at something like that.
Charlie
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