On 06/12/2013 06:25 PM, Jon Elson wrote: > Kirk Wallace wrote: >> Has anyone here worked on ultrasonic motors? I need to repair one (Canon >> lens) and need some insight. Such as, is there something like a >> continuity check to see what part of the motor might have a fault? >> > Probably not. The piezo components are going to look like big capacitors. > Possibly you could get a voltage spike out of them by rapping on the > motor. > > Jon
I do get a small voltage from the motor pins when I flex the ring, but at the time I had no information on what the pins did. I now have the service manual, which has a schematic of the drive circuit (an H-bridge). It shows four signals going to the motor, Phase A, Phase B, Ground, and Feedback. One plan might be to reproduce the circuit and have LinuxCNC provide the signals, then see what the feedback does or maybe see the motor move. There are a couple of 200 Volt capacitors in the circuit so this should make it more interesting. ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
