On Monday 30 March 2015 06:32:57 [email protected] wrote: > On Sun, 29 Mar 2015, Gene Heskett wrote: > > On Sunday 29 March 2015 15:50:39 Cecil Thomas wrote: > >> It might be too obvious to point out but I would feel the need to > >> ask about the current output capability of the 24 and 36 volt > >> supplies or batteries. > >> > >> A 36 volt supply that can't output the motor's rated current is not > >> going to turn the motor as well as a 12 volt supply with ample > >> current capacity. > > > > This is true, but if the supply was loaded that far beyond its > > capabilities, I'd also expect it to release its magic smoke well > > before the times the OP said he had tested it. Even if he was using > > a triplet of 916 batteries, to get his 36 volts they would have to > > be pretty well used to fail as bad as he claimed without failing > > with smoke & sound effects. > > > > Fresh ones loaded that heavy would probably have smoked in a minute > > or less. > > > > This is a case of having lots of info presented, 90% of which is not > > being backed up by a clarifying reply. > > > > At this point, I am wondering if English is not the OP's first > > language. > > I used three lawn mower batteries and the power supply is rated at 9 > amps.
That is better. Rules out power supply, leaves us with a duff driver design I believe. So I think, since you've made the $ investment in them, that I should goto the Allegro site and snag a copy on the docs on that chip before I can ask any more intelligent questions. Or maybe see about the TB6600 drivers on ebay, where "buy it now" starts at $14.37 ea. With the west coast stevadore strike, delivery times might stretch. At that price point, I'd keep these for a future project that doesn't need high speeds, and get a quad of the TB6600's, one for a spare, or to drive a future rotary table maybe? Please advise. These are .2 to 5 amp, 50 volt bypolar drivers. That implies a full H-bridge design instead of the half-bridge you have in the unipolar drives. All things considered, marginally more efficient. OPto-isolated inputs of course. That means the middle wire of each motor winding can be disconnected & tied off with a wire nut so it won't short to ground or whatever. > Many would say that I do not even speak English Been accused of that myself, and I was born & raised in Iowa, but I find I have to "dumb down" my technical explanations, usually to my employer. That is made difficult at times by trying to find the right words for someone not technically inclined. > I was born and raised in the deep south USA Adequate explanation. :) America, TBT, is just like the US vs GB saying, "two great countries, separated by a common language." :) Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
