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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo Testing
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<blockquote data-quote="oexing" data-source="post: 157553" data-attributes="member: 1493"><p>Most continental bikes had charging lights, no ammeters, so via that bulb the dynamo got some current for easy charging start, no residual magnetism required - but is normal state anyway. I´d think any electronics on these dc dynamos may hinder the build up of voltage in the dynamo as diodes like to sap any small charge being produced at very low speeds - not so with old regulators. That sapping of initial low voltage is the reason why a modern ac 3 ph alternator will not produce any power with an empty or wrecked battery. I don´t mean the permanent magnet type alternators but the automotive kind like in BMWs or Guzzis with rotor and its slip rings for field generation . The set of diodes and electronic regulator prevent any small voltage built up from residual magentism in the rotor. You really need a small battery to start the alternator charging. Many decades ago I had to drive home from Scotland to Bavaria , no lights as I think the battery had died there - or was it the rotor ? Had no further problems as the Earles BMWs had a great magneto on the camshaft, just no lights with dead 3 ph alternator.</p><p> So for a simple test of the Miller D 6 I´d hook 6 V to the field connector for testing output without the regulator messing up results. At 2000 - 3000 rpm there should be a good 6-7 V and some lighting on bulbs for checking real power. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 157553, member: 1493"] Most continental bikes had charging lights, no ammeters, so via that bulb the dynamo got some current for easy charging start, no residual magnetism required - but is normal state anyway. I´d think any electronics on these dc dynamos may hinder the build up of voltage in the dynamo as diodes like to sap any small charge being produced at very low speeds - not so with old regulators. That sapping of initial low voltage is the reason why a modern ac 3 ph alternator will not produce any power with an empty or wrecked battery. I don´t mean the permanent magnet type alternators but the automotive kind like in BMWs or Guzzis with rotor and its slip rings for field generation . The set of diodes and electronic regulator prevent any small voltage built up from residual magentism in the rotor. You really need a small battery to start the alternator charging. Many decades ago I had to drive home from Scotland to Bavaria , no lights as I think the battery had died there - or was it the rotor ? Had no further problems as the Earles BMWs had a great magneto on the camshaft, just no lights with dead 3 ph alternator. So for a simple test of the Miller D 6 I´d hook 6 V to the field connector for testing output without the regulator messing up results. At 2000 - 3000 rpm there should be a good 6-7 V and some lighting on bulbs for checking real power. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo Testing
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