On 21 September 2010 14:39, Lars Segerlund <[email protected]> wrote: > > I have heard you guys speak highly of servos, and I haven't got a > clue if you are running DC or AC servo motors ?
"AC Servo" can be used to describe two very different types of motor. It can be used to describe a 3-phase induction motor optimised for low-speed running, or a 3-phase permanent magnet DC motor (Brushless DC Motor, or BLDC). The latter type of motor will typically have either an encoder and hall-sensor connections, or just a resolver connection. Both can be configured to work with EMC2 but will need extra hardware. There are inexpensive speed/direction drives available, second-hand on eBay is a good source. I suspect that some of the model helicopter speed controllers might work well on a PWM/direction system (but you would need to make sure that the drive was not "sensorless" and was reversible). Off-the-shelf EMC-compatible systems are available from Pico Systems: http://pico-systems.com/motion.html and Mesa. http://www.mesanet.com/motioncardinfo.html If your servos are BLDC then the Mesa 7i39 would be a good fit, but would also need an FPGA interface-card (5i20 or 7i43). 100W is not all that much power though, so you will get the benefits of closed-loop control but might not actually see any speed increase. -- atp ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
