On Wednesday 07 March 2007, Jon Elson wrote:
>Kirk Wallace wrote:
>>Speaking of Yaskawa, I have a Yaskawa SGMP-15U314MS motor which seems
>> to combine the commutation information within the position
>> information. There are three pair of wires, each with what appear to
>> be an encoder signal. To use this motor with my setup, I will either
>> need to find a way to decode the current signals or fit the motor with
>> hall sensors. Does anyone have experience with either?
>
>Yup. It is proprietary, but as far as I could dope out, the C channel
>has transitions
>at the same pitch as the A and B. I suspect the phase relationship
>between the
>C channel and the A and B gives the commutation info, so at any static
>position,
>the drive can determine what effectively replaces the Hall signals. The
>encoder in these
>is pretty odd, too. It appears to be magnetic, and quite sensitive, IE
>touching or wiping
>the encoder drum destroys it. (That was on a motor that had filled up
>with way oil.
>It wans't working right before I opened it, and after cleaning, the
>encoder gave no
>output whatsoever. I wiped the info off the drum!)
FWIW, that encoder was probably doomed by the oil contamination from the
gitgo. Any known lubricant poisons the hall sensors by slowly migrating
through the ceramic base the sensor is mounted to, and it is not a
reversable process. The only thing you can do is decontaminate the scene
to lox clean status again, replacing the defective seal and the dead hall
sensors.
So don't wear that bit of sackcloth too proudly, the seal that allowed the
oil ingress in the first place is to blame and Yaskawa? should be advised
and a manufacturers defect replacement requested. Even if its out of
warranty I'd make noise, and at its price (I'm guessing high because the
SGMP is not listed on their web pages that I can find), a lot of it.
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Lowery's Law:
If it jams -- force it. If it breaks, it needed replacing anyway.
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
