On Friday 22 March 2019 08:39:21 andy pugh wrote: > I have a servo motor acquisition problem, I tend to buy servo motors > from eBay just because they are cheap. > A recent (ish) acquisition was an NSK Megatorque (RS1010, which means > 10" dia and 10" long) > This is rated at 147Nm (108 lb f) torque and for an axial load of > 9500N (2100lbf) so is quite a beast. > Currently I am using it as a glorified protractor to calibrate a Faro > arm. :-) https://photos.app.goo.gl/J3yhuhQ7e2vbjDLg8 > It has a very high-count encoder, thought he serial terminal connected > to the drive only reports angle to 0.01 degrees.
I hope you got the driver for it with it. Dissecting that into a schematic might reveal some secrets. Likewise, I think I'd be looking for a way to get the encoders full resolution out of it as .01 degrees sounds a bit coarse. I can't say anything else as I've never seen a critter like that, so I am curious too, Andy. My background in broadcasting rather demonstrates that simple things that Just Work are the general order so we don't get to see the exotic stuff unless theres nothing else to do the job. > The motor is an odd shape, the output flange is a ring, and there is a > static tube inside that. Looking around on the web I found: > https://forum.strojirenstvi.cz/viewtopic.php?t=21057 > Which rather explains the odd shape. It seems to be a motor with two > sets of coils. Translating that site into our native tongue might be a good starting point. I tried to learn some Chech from my fav auto scrap yard dealer back in the '50's, but 60+ years has erased that now and I expect Joe is long gone by now too. I was 22ish and he was 50ish then. I was driving a 52 Nash Ambassador and learning from his hints where another 100+ virtually free horsepower was hideing. I surprised many a hot rodded ford in their day with it. Speedo needle well past straight down (120 was at about 4:30pm on the dial & still getting 19 mpg), I ran off and hid from anything I wanted to show how it was done. The only thing it didn't have to match was brakes. I hopelessly warped a couple sets of drums all around in gotta stop situations. Teeny little 9" stuff. > There is a toothed rotor rather like a stepper motor, with a toothed > inner stator. > > Is this a variable reluctance motor? Do the outer magnets simply > magnetise the rotor, or would there be more teeth on the outside? Tell us what you find Andy. 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
