It looks like 3 hall sensors for commutation on the inside and a magnetic encoder chip on the outside if I'm seeing correctly. The chip in the middle of the board is likely the encoder chip and the wheel below it a multipole magnet ring. I'd bet the datasheet for that chip would unlock the encoder's secret.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ We are like tenant farmers chopping down the fence around our house for fuel when we should be using Nature's inexhaustible sources of energy -- sun, wind and tide. ... I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that. -Thomas Edison, inventor (1847-1931) >________________________________ > From: Mark Cason <farmerboy1...@yahoo.com> >To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> >Sent: Wednesday, May 9, 2012 11:37 PM >Subject: Re: [Emc-users] AC Servo Motor > > > I took the motor apart to see what the encoder looked like, and I'm >assuming that these are hall sensors: >http://www.flickr.com/photos/46689581@N03/7168795700/in/set-72157629660267772/ >http://www.flickr.com/photos/46689581@N03/7168808298/in/set-72157629660267772/ > > A few more photo's are here: >http://www.flickr.com/photos/46689581@N03/sets/72157629660267772/ > > I haven't traced the wires yet, so I still don't know what goes >where. It's a brushless servo motor for sure, with a permanent magnet >rotor. Considering that this motor came off of a 20 year old embroidery >machine, it's clean, in really good condition, and the bearings turn >smoothly. Now, to figure out how to get a signal out of it... > >-- >-Mark > >Ne M'oubliez ---Family Motto >Hope for the best, plan for the worst ---Personal Motto > > >------------------------------------------------------------------------------ >Live Security Virtual Conference >Exclusive live event will cover all the ways today's security and >threat landscape has changed and how IT managers can respond. Discussions >will include endpoint security, mobile security and the latest in malware >threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
