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Overspeed alarm based on alternator frequency
Colin,
I'm really confused. If you already know so much about alternators, why ask your question to the group in the first place? Glenn has expressed very valid concerns when equiping an engine with an alternator. It appears that you have out engineered yourself. If you need to spin your alternator 8k rpm to get it to perform, you have clearly chosen the wrong alternator. Go out and buy a proper large magnet Leese-Neville industrial grade alternator and spin the thing acording to OEM instructions. Problem solved. Steve "CS" wrote in message ups.com... Glenn Ashmore wrote: Look at the LN curve I've posted - it is not as stated above. Full output is at 5000 alt rpm and it then levels out. That is what I meant about "OP's choice of alternators may not be the best ". That particular alternator has a relatively slow slope up to full power. My engine can deliver up to 20kW at engine idle according to the makers engine manual - more than enough for the 2 - 3 kW taken by the alternator. Torque will also not be an issue with dual belts. Off which end? My Yanmar can handle a lot of torque off the back end but the front crankshaft bearings are not designed to handle a lot of side load. Double belts will stop the slippage but a double pulley extends the center of load further from the bearing increasing the leverage of the side load. Off the front crankshaft and or a PTO shaft. The engine is an 8 litre 6 cyl natural aspirated 160 Hp engine which weights 1000kg and is a proper industrial marine engine as used by fishing vessels - not a bleeding micky mouse Yanmar engine designed for pleasure yachts. I have done a certain amount of research and I am amazed by the complete rubbish being spouted about alternators. |
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