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Hello Art, nice engine indeed and would be fun to watch it doing something. Apart of hooking an generator to produce electricity, you may consider also purely mechanical devices to be driven as well. What about pencil sharpener ? Would be cool and would give a perfect answer to that question what does it do My stirling engine that I'm currently playing with don't have enough power to drive one but your Val should cope with it in ease with the right gearing.
I do have a couple printer motors but don't know if they are ac or dc. Is there any way to tell? besides hoping the printer (still laying around at work) states which and what voltage.
I think the best thing is to make up a voltage regulator, use a LM 315K in a TO-3 case, with this you can adjust the voltage, if you input is AC you will need to rectify it.
There is a remarkable lack of information on the internet about this electric motor. Mabuchi HP C9000-60005 It does appear to be a 12-18v motor but that is all I can find, no rpm, amps etc. If I was reading 38v does that mean the rpm was to high and it needs to spin slower?Art