Lars Segerlund wrote: > > > Hi again, > > Ok, so 100W is on the low side, what power levels are you guys running > ? I might have some 300 W ones lying around somewhere also. > > I looked at the power level of some steppers used for cnc conversion > and NEMA 23 bipolars seemed to be around 100 W > > The motors are two phase AC servos, thus the control problem. > Ah, that is an entirely different thing. Generally, these are just AC induction motors, made essentially identically to what we call in the US "permanent split capacitor" motors. They are designed to have one winding continuously energized with AC, phase shifted with a capacitor, and the output torque is controlled by applying a varying amount of AC, not phase shifted, with a servo amplifier. The direction is reversed by reversing the polarity of the AC output of the servo amplifier (180 degree phase reversal).
These were used on chart recorders and other stuff that was usually moved pretty slowly. I doubt you will find a modern servo amplifier for these motors. My Bridgeport mill has 1/8 Hp continuous motors, and they are pretty weak. The peak output is about 400 W, though. I think most people are using motors with at least a 400 W continuous rating for a Bridgeport-size machine. I have a very small, NEMA 16-size motor on my benchtop minimill, and with 16 TPI screws and 4:1 belt ratio, it is fine. That is about an 80 Watt motor. Jon ------------------------------------------------------------------------------ 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
