Originally Posted by steveg AC servos like the Omron and Yaskawa (I believe the Omrons maker) as well as Fanuc,Meldas(mitsubishi)
all use the keyed and aligned built-in encoder for the commutation.
these motors MUST be used with the drive that is built
for them, as the encoder connects to the drive for feedback
The same encoder provides all the needed feedback
position,phase angle(commutation) and velocity. |
Many Yaskawas come with an absolute encoder, but the motor I have came with an incremental encoder. If there are commutation tracks, there are dozens of drives that will work with it. There is nothing stopping someone from making a drive that will work with any brushless motor other than a lack of market. The motor I have can be driven by some drives available from AMC as just one example.
I also have come to believe that the Omron and Panasonic motors are made by Yaskawa. There seems to be many fewer companies actually making motors and drives than market them. I've often wondered if the Electrocraft DDM-xxx model drive was from Yaskawa, it looks almost identical to the Sigma-II drives. It seems that the Sigma II motors will work in incremental mode, but I've never really researched that. They go for too much money on Ebay for me to play that game. I do have some really nice little Fanuc motors that I haven't figured out how to drive yet. It isn't easy to come by the tech info for them. Me -->
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