What is this strange encoder motor?
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From: Ignoramus18921 on 2 Aug 2010 19:50 Lots of new pictures here. http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/24-Troyke-Rotary-Table-U12PNC/ This is a servo motor driven rotary table Troyke U12PNC. I thought that it was a simple servo motor with a tachometer and encoder on the back. Nothing could be further from the truth. When I opened it up, the tach was on the back alright, but no encoder. I took off a box hanging on the front of this contraption and I think this is where the encoder is. There are two cylinders. One is called "Electro-craft moving coil tach generator". Part 0100-00-022. The other is "Summit engineering, Boseman MT. Model 573-211-10, 2500 Hz, rotor 1 phase, stator 2 ph, spec code H.S.C.T., 11BRW-300-70/10." Does anyone have AN idea just what are they and whether I can use it as a quadrature encoder. On the rear of the motor, there is not enoug free hanging shaft to mount a modern encoder. My uneducated guess is that it is a "resolver". Thanks
From: Tim Wescott on 2 Aug 2010 20:56 On 08/02/2010 04:50 PM, Ignoramus18921 wrote: > Lots of new pictures here. > > http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/24-Troyke-Rotary-Table-U12PNC/ > > This is a servo motor driven rotary table Troyke U12PNC. > > I thought that it was a simple servo motor with a tachometer and > encoder on the back. Nothing could be further from the truth. When I > opened it up, the tach was on the back alright, but no encoder. > > I took off a box hanging on the front of this contraption and I think > this is where the encoder is. There are two cylinders. > > One is called "Electro-craft moving coil tach generator". Part > 0100-00-022. > > The other is "Summit engineering, Boseman MT. Model 573-211-10, 2500 > Hz, rotor 1 phase, stator 2 ph, spec code H.S.C.T., 11BRW-300-70/10." > > Does anyone have AN idea just what are they and whether I can use it > as a quadrature encoder. > > On the rear of the motor, there is not enoug free hanging shaft to > mount a modern encoder. > > My uneducated guess is that it is a "resolver". My educated guess is that it is a resolver. The frequency is right, the labels on the rotor and stator are right. Do you have a signal generator and an O-scope? Feed it with 2500Hz to the rotor, and see if you get 2500Hz out the two stator windings, with a coupling that depends on the shaft position. There may be industrial resolver to encoder converters out there -- it would be something that a machine designer or retrofitter might need. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
From: Ignoramus18921 on 2 Aug 2010 21:48 On 2010-08-03, Tim Wescott <tim(a)seemywebsite.com> wrote: > On 08/02/2010 04:50 PM, Ignoramus18921 wrote: >> Lots of new pictures here. >> >> http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/24-Troyke-Rotary-Table-U12PNC/ >> >> This is a servo motor driven rotary table Troyke U12PNC. >> >> I thought that it was a simple servo motor with a tachometer and >> encoder on the back. Nothing could be further from the truth. When I >> opened it up, the tach was on the back alright, but no encoder. >> >> I took off a box hanging on the front of this contraption and I think >> this is where the encoder is. There are two cylinders. >> >> One is called "Electro-craft moving coil tach generator". Part >> 0100-00-022. >> >> The other is "Summit engineering, Boseman MT. Model 573-211-10, 2500 >> Hz, rotor 1 phase, stator 2 ph, spec code H.S.C.T., 11BRW-300-70/10." >> >> Does anyone have AN idea just what are they and whether I can use it >> as a quadrature encoder. >> >> On the rear of the motor, there is not enoug free hanging shaft to >> mount a modern encoder. >> >> My uneducated guess is that it is a "resolver". > > My educated guess is that it is a resolver. The frequency is right, the > labels on the rotor and stator are right. > > Do you have a signal generator and an O-scope? Feed it with 2500Hz to > the rotor, and see if you get 2500Hz out the two stator windings, with a > coupling that depends on the shaft position. > > There may be industrial resolver to encoder converters out there -- it > would be something that a machine designer or retrofitter might need. > There are some converters out there, Jon has one for sale too. Tim, how much angular accuracy could I get from this resolver, in pulses per revolution? If this is too complicated, I may just look for the right sized modern servo motor on ebay. i
From: Ignoramus18921 on 2 Aug 2010 21:48 > >On 2010-08-03, Ignoramus18921 <ignoramus18921(a)NOSPAM.18921.invalid> wrote: > On 2010-08-03, Tim Wescott <tim(a)seemywebsite.com> wrote: >> On 08/02/2010 04:50 PM, Ignoramus18921 wrote: >>> Lots of new pictures here. >>> >>> http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/24-Troyke-Rotary-Table-U12PNC/ >>> >>> This is a servo motor driven rotary table Troyke U12PNC. >>> >>> I thought that it was a simple servo motor with a tachometer and >>> encoder on the back. Nothing could be further from the truth. When I >>> opened it up, the tach was on the back alright, but no encoder. >>> >>> I took off a box hanging on the front of this contraption and I think >>> this is where the encoder is. There are two cylinders. >>> >>> One is called "Electro-craft moving coil tach generator". Part >>> 0100-00-022. >>> >>> The other is "Summit engineering, Boseman MT. Model 573-211-10, 2500 >>> Hz, rotor 1 phase, stator 2 ph, spec code H.S.C.T., 11BRW-300-70/10." >>> >>> Does anyone have AN idea just what are they and whether I can use it >>> as a quadrature encoder. >>> >>> On the rear of the motor, there is not enoug free hanging shaft to >>> mount a modern encoder. >>> >>> My uneducated guess is that it is a "resolver". >> >> My educated guess is that it is a resolver. The frequency is right, the >> labels on the rotor and stator are right. >> >> Do you have a signal generator and an O-scope? Feed it with 2500Hz to >> the rotor, and see if you get 2500Hz out the two stator windings, with a >> coupling that depends on the shaft position. >> >> There may be industrial resolver to encoder converters out there -- it >> would be something that a machine designer or retrofitter might need. >> > > There are some converters out there, Jon has one for sale too. > > Tim, how much angular accuracy could I get from this resolver, in > pulses per revolution? > > If this is too complicated, I may just look for the right sized modern > servo motor on ebay. I forgot to add, or make a shaft adaptor if it is at all possible, and mount an encoder. i
From: Bill Noble on 2 Aug 2010 23:24 "Ignoramus18921" <ignoramus18921(a)NOSPAM.18921.invalid> wrote in message news:-6ednaefZKBHxMrRnZ2dnUVZ_hCdnZ2d(a)giganews.com... > Lots of new pictures here. > > http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/24-Troyke-Rotary-Table-U12PNC/ > > > Does anyone have AN idea just what are they and whether I can use it > as a quadrature encoder. > yes. And No
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