Ed wrote: > I recently purchased a small HMC with Fanuc control and red cap AC > motors. The control and probably servo drive will go on Ebay as I have > no docs with the system and it had been partly dismantled. A couple of > questions, Does antone know if a VFD will work on a PM 3 phase motor as > well as a squirrel cage type? No, it will NOT work. That would make the spindle drive much > easier. Does anyone make an amp that works well with EMC and can drive > an AC servo? Motors specs are: 198V at 7.6A at stall. Jon, will your > system work with this? I can change the encoders. Thanks. Ed. Maybe. It depends a lot on the design of the motor windings. The only way for me to know is to try it. Especially if you don't need the full RPM of the motor, there should be no problem. Assuming 250 IPM is good, and a 5 TPI screw, it only needs 1250 RPM. If it is a 2000 or 3000 RPM motor at the 198 V, then I think there is no electrical limit.
If you want to pull one of the motors off and send it to me, I can test it on my drives. First, I have to find out the wiring setup to make the encoder work, then I can check it for smoothness. Some motors run quite smoothly with my 6-step drive scheme, some don't - they buzz a lot at around 150 RPM. If the encoders are inscrutable proprietary ones that mix the index and commutation signals like Yaskawa does, then Renco has some really nice 2.1" encoders with 6 channels (ABZ and UVW for commutation signals.) Jon ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
