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.
/ Lars
On Sep 21, 2010 5:37 p.m., "Jon Elson" <[email protected]> wrote:
Lars Segerlund wrote: > I have heard you guys speak highly of servos, and I
haven't got a > clue if...
Most servo users in the low-cost/hobby world are using DC brush servo
motors.
But, there are some of us using brushless motors with either our own
servo amps
or commercial units.
> The reason is that I have some AC servo motors around 100W or so, > would
they be good candidates...
At the 100 W level, the only advantage over a stepper is the position
feedback.
The motor performance is not much different. Perhaps a servo can offer
less vibration,
or run at high speeds all day without heating up.
> I haven't considered them since the control is a bit complex, but I >
believe that it's simple en...
I doubt there'd be much performance improvement on a small machine. The
advantages of a
servo are :
1. position feedback to the computer, so crashes and stalls can be
detected.
2. greater speeds, and sustained speeds without overheating. Most steppers
cannot run over 1500 RPM for long periods without excessive internal
heating.
3. servos give full rated torque up to their maximum speed, steppers lose
torque (very roughly) on a linear slope as speed increases.
> Is that what quadratur control was refering to ? or was that only as > in
driving/braking ? ( as ...
I think the mention of quadrature may be in reference to the output
waveforms
from the parallel port. Stepgen has a variety of schemes to command a motor
drive other than step/direction. There is a quadrature output where the
2 outputs
look exactly like an encoder signal. This can be easily converted to
the signals
to drive the 4 transistors of a unipolar driver or full-bridge bipolar
driver.
Jon
------------------------------------------------------------------------------
Start uncovering the...
------------------------------------------------------------------------------
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
