So these are actual stepper motors and not 3-phase BLDC motors with step/direction input?
I always assumed that it’s the latter, with the difference being lost in translation. > On Apr 30, 2021, at 11:23 PM, Gene Heskett <ghesk...@shentel.net> wrote: > > On Friday 30 April 2021 23:25:43 ken.stra...@gmail.com wrote: > >> I haven't been following your project recently but am intrigued by >> "And it turns the armature easy enough the 3NM 3 phase motor (those >> are magic folks, running 50C cooler than 2 phase stuff) I'll use will >> not be a bit overstressed." Where did you end up getting your motors >> and what are you using for drivers? >> > Ebay for all of them. There are 2 phase with feedback but they work at > full motor currants all the time. The only driver that counts and really > is 3 phase is the LCDA357H although I expect it will grow bigger brother > versions as time goes by and folks become aware of them. The chinese are > not heavly advertizing that, the difference getting lost in the > translation or ???. > > Motor wires are labeled UVW just like a vfd. And a full step is 1.2 > degrees, not 1.8. > > An encoder on the back of the motor talks to the driver, not to LCNC, and > you drive them exactly as you would any other stepper setup. > > Step speeds are still limited by the input opto's to maybe 250 kilohertz. > It, the LCDA3576H driver is small, about the size of a 100 mil pack of > smokes, has no currant setting switches because the motor current is > determined by the magnitude of the error. Makes it at least 5x more > efficient. Rated at 20-50 VDC input, there are 1,2, & 3 NM sizes that I > know of right now. Running my 11x54 Sheldon with rapids 2x faster than > the 2 phase stuff I took off, motor heating might be 5F. And if they > lose a step, they have an error out that can shut down LCNC with the > e-stop circuit. > > Highly recommended by great, great, grandpa Gene as a genuine improvement > in stepper technology. > >> -----Original Message----- >> From: Gene Heskett <ghesk...@shentel.net> >> Sent: April 30, 2021 10:45 PM >> To: emc-users@lists.sourceforge.net >> Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive? >> >>> On Monday 22 March 2021 09:19:19 Sam Sokolik wrote: >>> 202,200 for the outside spline and the flex gear is 200. In this >>> situation - the 202 tooth spline is stationary to the stepper. The >>> 200 tooth outside spline is mounted to the faceplate. In this >>> layout - the ratio apears to be 101:1 >>> >>> In this situation the stepper motor and the face plate spin the same >>> direction. >>> >>> With the same set of outside spines swapped - the ratio is 100:1 >>> >>> I am sure Andy can explain it. It doesn't make sense to me. >>> >>> Happy with runout... https://www.youtube.com/watch?v=eLyP2YwdstQ >>> >>> sam >> >> I am running some behind you Sam, with my project, having printer >> problems kills time and money. Finally settled on an ender 5 Plus, >> which is working passably well but I've wasted $3k getting there. >> >> Any way, I changed the design some from yours, to a 30/1 because those >> big spines print better, and by making my own bearings in openscad, >> useing crosman bb's for balls. I put a huge one with over 150 loose >> bb's directly on the outside of the moving spline, with only the lip >> of the output coupling disc (printed of course) interposed. And the >> floating spline has 3 more of those, sized for a good friction fit >> inside that spline, with both the spline and the bearings made as thin >> as practical to improve the flex life, and I just took the eliptical >> armature off the build plate and wiggled in into those 3 bearings >> inside the loose spline, so thats the driver armature, no commercial >> ball bearings anyplace like yours. I've made the 8mm hole in the >> plastic for the motor shaft into a prominent D-flat, and used a cbn >> wheel to make the flat much wider on the motor shaft, and this >> armature will be driven onto the motor shaft without any grub screws >> at all. No clue how long it will run before it bores that hole out and >> I have to make an alu inner for it. :( >> >> But I just now assembled it without the motor, turning the armature by >> hand, and it works, with no detectable backlash. And it turns the >> armature easy enough the 3NM 3 phase motor (those are magic folks, >> running 50C cooler than 2 phase stuff) I'll use will not be a bit >> overstressed. Those bb's will pound the plastic smooth and get >> smoother with use. >> >> So now its time to finish the output shaft, and make the rest of the >> housing. Which will be supported by the big bearing at the spline end, >> and 4 of the printed bearings at the load end. I've got the motor end >> gnawed out of some 1" stock I had, and I bought a foot of 3.125" thick >> by 6" wide stuff so I can make 2 output housings. That showed me the >> current price for extruded alu, scary. I also bought enough rod to >> make about 4 output shafts, over $200. And I've a spare 4" chuck from >> a TLM upgrade to a 5" to use on it. Or better yet, buy another 5" from >> LMS. >> So I'll get there, if I don't fall over first. At my age, thats always >> a possibility. >> >> I'll try to get some pix of what I've got so far, put up on my web >> page over the weekend. Along with some of the openscad source files. >> >> As usual, this stuff keeps me alone, safe, and out of the bars. :-) >> >> 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) >> If we desire respect for the law, we must first make the law >> respectable. - Louis D. Brandeis >> Genes Web page <http://geneslinuxbox.net:6309/gene> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > 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) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
