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Lister Market Place (things for Sale) / Re: LOVSON 6/1 with 3KW Head For Sale
« on: November 24, 2011, 03:28:45 PM »
I'm interested depending on price.
Cory
Cory
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Bummer, no Linux support
Jens
I am always amazed at the lovely things that people create with such skill and craftmanship. Now if someone could make a working scale model of a Lister cs.
I'm working on having a scale model of a CS or CS SOM made.
QuoteAs far as creating good DC current, a multi phase PM alternator would be nice. Something like the homemade windmill from a brake rotor design. Who was the guy that builds them that joined this forum? Is he still around? Didn't he have one on a mini-petter and a steam engine? Maybe build the magnet rotor into the flywheel of a Listeriod?
Like this: http://www.fieldlines.com/story/2007/10/26/141411/24 (scroll down a bit to the Listeroid with magnets)
or the steam engine project http://otherpower.com/steamengine.shtml ?
It looks like variable frequency drives (VFDs) have become inexpensive (see ebay) - they will take in ~240VAC and output 3 phase 240VAC at any selected frequency. Maybe set one to 60Hz output and use line-to-neutral to get a steady 120VAC waveform independent of input. Hmm, looks like they don't supply a neutral. So (I think) you can only get phase-to-phase 208VAC out of them..
A machinist with CNC Machines!!!!! Welcome Aboard !
I agree that efficiency is a factor, although being able to run the engine slow at low loads and turn it off and run on batteries at very low loads makes up for much of that. Primary motivation is that I want perfect power - no voltage, frequency or waveform variations. Say 70% for Bosch long haul 12V alternators and then 90% for an inverter. Total around 60%.
There are solar inverters (from Outback, etc) that will take a range of high voltage DC inputs - like what you would get from 120V or 240VAC rectified.
I wonder how close one could get to a square wave by rapidly adjusting the field strength of a ST head. Square waves are best for producing DC. Or run it at a higher speed to get a higher frequency.
Hmm, thinking about this, if one could feedback from the DC voltage produced back to the ST head regulator, then the inverter design for a modified sine wave would be very simple (IGBTs + timer).