Thanks Andy and Peter for the quick answer! I'll be measuring these tomorrow so I can see if it happens as Peter says, but I guess it will happen like that.
So these work like a resolver but insted of the excitation signal driving the SIN and COS windings is the other way around? Because SIN and COS signals are square signals and 0.3 volts signal is a sine wave signal. I guess with HAL programming and an appropiate input circuit I could read the signals and make it work , but I don't know if this is going to be convenient or if it's better to replace them with encoders and let this for a experimentation project. I think about this because I would like the machine to be running as quick as possible with LinuxCNC. 2014-12-03 21:22 GMT-03:00 Peter C. Wallace <p...@mesanet.com>: > On Wed, 3 Dec 2014, Leonardo Marsaglia wrote: > > Date: Wed, 3 Dec 2014 20:42:29 -0300 >> From: Leonardo Marsaglia <leonardomarsagli...@gmail.com> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >> Subject: [Emc-users] OT: Measuring Mitsubishi resolvers >> >> Hello to all again. >> > > We're defining the hardware for the Mazak conversion and yesterday my > brother and I measured the resolver signals to identify what voltage and > frequency they use. I've been reading some information about resolvers and > it's not too difficult to understand the way they work, anyway I have a > little doubt with respect to the measurements on the excitation part. > Here's what we've got from them: > > Between Sin + and Sin - there's 12 volts and a 4.5 khz frequency. Same > thing happens on Cos + and Cos - and there's the 90ÿÿ phase shifting > between > the two of them. > > The weird thing is, when we measure the Excitation + and Excitation -, we > get the 4.5 khz frequency but a voltage of about 0.3 volts. > > Whenever I move the axis none of this values change at all, at least that's > what the digital scope showed. There's also a ground pin but I don't think > that has anything to do. What I found weird is the almost none voltage on > the excitation pins. I have to say the resolvers are fully functional and > the machine is working ok. > > My doubt is why is this happening? The main goal is to measure the > transformation ratio just to be sure that I can adapt these to LinuxCNC, I > don't want to fit encoders because these resolvers are robust and they are > working pretty well. > > Any ideas? Since there's a lot of people here that dealed with this before > I'm sure you're going to know everything about this devices. > > Thanks as always for your help! > > -- > *Leonardo Marsaglia*. > > That sounds like a inductosyn (sp) > > These have sine and cosine exitation signals (constant amplitude) and the > result is a constant amplitude signal (your .3V) that is phase shifted 360 > degrees every cycle (take a look at the .3V signal but sync the scope on > one of the 12V signals while you turn the shaft) > > These have the advantage over resolvers that the interpolation can be done > without a A-D converter (you just need to time the zero crossing of the .3V > oulput signal relative to one of the 12V excitation signals) > > > ------------------------------------------------------------ > ------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&; > iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
