Resolver-to-Digital Conversion

[Jonathon]

Hey,
I have made the mistake of not checking the encoders on my servo's before oredering 3 gecko drives.
The encoders are Harowe Servo 11-brc-300-G.
Is there any simple circuit to convert these to an a/b digital signal?
I have the schematic for the windings, they have six wires.
Thanks.

[3t3d]

Originally Posted by Jonathon Hey, I have made the mistake of not checking the encoders on my servo's before oredering 3 gecko drives. The encoders are Harowe Servo 11-brc-300-G. Is there any simple circuit to convert these to an a/b digital signal? I have the schematic for the windings, they have six wires. Thanks.

Fastest, easiest cheapest, IMHO is to get some encoders.
There are R-D converters (Resolver to Digital) . By the time
you find one, wire it up, test it out, etc. You could maybe find
an encoder for less than the R-D module.
You could build an R-D circuit, but not as cheap as buying a
surplus encoder.

Pete

[Jonathon]

After looking for a simple circuit,wich there doesn't seem to be, I think you might be right Pete.
Thanks for the reply.

[jmelson]

Originally Posted by 3t3d Fastest, easiest cheapest, IMHO is to get some encoders. There are R-D converters (Resolver to Digital) . By the time you find one, wire it up, test it out, etc. You could maybe find an encoder for less than the R-D module. You could build an R-D circuit, but not as cheap as buying a surplus encoder. Pete

Yes, but these are size 11 resolvers, 1.1" diameter. Some machines have housings that won't handle a larger encoder. You CAN find size 11 encoders, like
the Sumtak, but they can be quite expensive. I have just come out with a resolver to quadrature converter toallow you to keep the resolvers, see http://pico-systems.com/resolver.html
for more info.

Jon

[vger]

Just a short story about resolver/syncro signals. In an F-15 avionics shop a connector was replaced on a Roll Yaw computer off the aircraft. Post repair the unit passed all tests on the test station and was returned to service. A week later it came back written up for "Uncommanded inversion in flight". Pilot went to autopilot and was very quickly turned upside down. Seems 2 of the resolver signal wires were inadvertantly swapped during the connector exchange and the test station passed it because it only looked for a "null" signal on those two wires with zero deg setting. 180 deg out also gave a null reading. There was an up date to the test program to check at 0 deg and 45 deg to avoid future problems. By the way, the pilot was pretty hot about it...

Steve

[keebler303]

I have similar size 11 resolvers on some motors I have. I haven't yet, but I plan to make some adapters with a bearing and shaft inside which will mount where the resolvers were and accept a US Digital encoder on the back. There is just enough room in the housing to fit an E2 encoder.

Good Luck
Matt