I too, a former electrical engineer, had no idea what that device was for. Thank you for the informative presentation. That's a clever little device, useful for many applications
When I was in high school I got a pair of synchros (also called selsyns) at an electronics surplus store. The single windings were rated at half the US standard AC line voltage, so I put them in series, then connected the triple windings in parallel, and made a rather strong repeater. I had a lot of fun with that myself, and later while teaching physics and electronics. If I ever get the garage cleaned out I will probably find them, and have some more fun now that I am retired.
Resolvers are fairly easy to read with an Arduino or similar. They don't particularly care about the excitation voltage, and (perhaps surprisingly) work fine with square-wave excitation. So you just need to measure the two voltages and use the atan2 function to get the angle out when excited with a 5V or 3.3V square wave from a 50% duty cycle PWM generator. You need a phantom baseline voltage at half Vcc, but you can create that with a zener.
@@VoltaicoDevelopment on the stator it's for producing sine and cosine so you can get an angle around 360 degrees. On the rotor, it could be for redundancy and health checks. Those are used in critical applications so you really need to account for every possible failure mode.
I too, a former electrical engineer, had no idea what that device was for. Thank you for the informative presentation. That's a clever little device, useful for many applications
Awesome introduction! Thank you my friend. Looking forward to watching more on these and their applications.
GREAT VIDEO you made something complicated into something simple and practical, God bless you for it
After a lot of videos, I found this to be most helpful
Clear explanations with diagrsm and oscilloscope, began working on robot arms and was wondering about the angle measurement, thanks a lot!
Pleasure! Let us know if you have any questions.
When I was in high school I got a pair of synchros (also called selsyns) at an electronics surplus store. The single windings were rated at half the US standard AC line voltage, so I put them in series, then connected the triple windings in parallel, and made a rather strong repeater. I had a lot of fun with that myself, and later while teaching physics and electronics. If I ever get the garage cleaned out I will probably find them, and have some more fun now that I am retired.
Same for me! When I was a teenager I somehow came across a selsyn pair and played around with it.
Thanks a lot for Introducing the Resolver with a great explanation.
Glad it was helpful!
Resolvers are fairly easy to read with an Arduino or similar. They don't particularly care about the excitation voltage, and (perhaps surprisingly) work fine with square-wave excitation. So you just need to measure the two voltages and use the atan2 function to get the angle out when excited with a 5V or 3.3V square wave from a 50% duty cycle PWM generator.
You need a phantom baseline voltage at half Vcc, but you can create that with a zener.
Great information! Thank you!
Glad it was helpful!
These are used extensively in the aerospace industry and many aircraft systems rely on them!
Thanks you for sharing
Thanks for you
Neat. Merci
Very good explanation , thank you very much , i am going to search the web to get some of these resolvers .
You are welcome!
Thank you for this video!
I have a question: why does the resolver rotor have 2 windings? Isn’t one enough to measure the rotor angle?
Two windings allow for detecting the spinning direction. Also it allows for better resolution.
@@VoltaicoDevelopment on the stator it's for producing sine and cosine so you can get an angle around 360 degrees. On the rotor, it could be for redundancy and health checks. Those are used in critical applications so you really need to account for every possible failure mode.