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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Make your own Generator
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<blockquote data-quote="oexing" data-source="post: 108311" data-attributes="member: 1493"><p>Laverda twins had a dynamo 12 V 150 W at the front of the engine, belt drive. The extra small motor starter was via a sprag clutch drive and chain plus planetary gear in the starter motor behind the cylinders, don´t know about MVs. </p><p> </p><p> All brushless motors have no windings in the rotor, just permanent magnets there. So I cannot see a problem with high revs, quite unlike the old dynamos and their brushes on collectors. There you can expect to find burnt soldered contacts and flung out tin solder when something broke in the windings. The armature really is the weak point in a dynamo, the field coils rarely fail. </p><p> I honestly got my wattage numbers from my own tests and loaded the motors by hooking up a few bulbs, quartz too and noted the voltage on a digi voltmeter. That is why I wrote, don´t trust any numbers in ads but do your own tests and see what that shows. I just ordered another brushless from Aliexpress, said to be a 400 W type, 48 V. Length is no problem on the Vincent, but I want to keep the 68 mm diameter. So in a few weeks I can tell if that big motor might be suitable. It has a massive 14 mm shaft, so a decent ball bearing to go with it I guess. </p><p> Hmmm, don´t see an easy way to have a starter/dynamo combo at this place. You´d need some gear reduction for the starter to make it over TDC but then you don´t get the speeds when asking for the generator function. The starter/dynamo combos I know from BMW Isetta 250 and 700 cc flat twin car or some scooters from Zündapp had veeery big diameter armatures and 12 batteries plus direct drive sitting on the crankshafts. </p><p> What I noticed in my tests, you get high voltage at very moderate revs with no load but when loaded this goes down a lot. So only an actual load test will be helpful. </p><p> Bill, your Lithium battery is a LiFePo4 type - hopefully ?? Not the explosives as in notebooks ?? I would not expect to get problems with electronic step-down converters then, batteries should not be as critical as tablets or the like and I believe truck drivers will have lots of them for operating all sorts of electronic devices on these. </p><p> Below another brushless on back order from Ali today, possibly a bit too big, will see. </p><p></p><p> Vic</p><p><a href="https://www.aliexpress.com/item/32843058090.html?spm=a2g0o.cart.0.0.2b8f3c00cwqRVw" target="_blank">48 V 400 W brushless</a></p></blockquote><p></p>
[QUOTE="oexing, post: 108311, member: 1493"] Laverda twins had a dynamo 12 V 150 W at the front of the engine, belt drive. The extra small motor starter was via a sprag clutch drive and chain plus planetary gear in the starter motor behind the cylinders, don´t know about MVs. All brushless motors have no windings in the rotor, just permanent magnets there. So I cannot see a problem with high revs, quite unlike the old dynamos and their brushes on collectors. There you can expect to find burnt soldered contacts and flung out tin solder when something broke in the windings. The armature really is the weak point in a dynamo, the field coils rarely fail. I honestly got my wattage numbers from my own tests and loaded the motors by hooking up a few bulbs, quartz too and noted the voltage on a digi voltmeter. That is why I wrote, don´t trust any numbers in ads but do your own tests and see what that shows. I just ordered another brushless from Aliexpress, said to be a 400 W type, 48 V. Length is no problem on the Vincent, but I want to keep the 68 mm diameter. So in a few weeks I can tell if that big motor might be suitable. It has a massive 14 mm shaft, so a decent ball bearing to go with it I guess. Hmmm, don´t see an easy way to have a starter/dynamo combo at this place. You´d need some gear reduction for the starter to make it over TDC but then you don´t get the speeds when asking for the generator function. The starter/dynamo combos I know from BMW Isetta 250 and 700 cc flat twin car or some scooters from Zündapp had veeery big diameter armatures and 12 batteries plus direct drive sitting on the crankshafts. What I noticed in my tests, you get high voltage at very moderate revs with no load but when loaded this goes down a lot. So only an actual load test will be helpful. Bill, your Lithium battery is a LiFePo4 type - hopefully ?? Not the explosives as in notebooks ?? I would not expect to get problems with electronic step-down converters then, batteries should not be as critical as tablets or the like and I believe truck drivers will have lots of them for operating all sorts of electronic devices on these. Below another brushless on back order from Ali today, possibly a bit too big, will see. Vic [URL='https://www.aliexpress.com/item/32843058090.html?spm=a2g0o.cart.0.0.2b8f3c00cwqRVw']48 V 400 W brushless[/URL] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Make your own Generator
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