Siemens had some integrated Servo/Drive units. You ran power to them
along with a network connection and that was all that was required. I
think the bigger ones were in the 1-2 kw range. They were not very
popular at the time (10+ years ago). But I would not count that idea
out yet. They simplify a lot of things.
Dave
On 10/20/2017 6:43 AM, Pauluzs wrote:
This might be the way small con/pro-sumer goods are going to take,
Although having an industrial background, i don't see this trend going
to change soon.
Can't imagene larger motor with integrated drives etc. just not
practical, modulair and to costly.
All that aside and back to the beaglebone, still wondering if the
pru's would be capable of generating the (s)pwm for 18 pins at a
reasonable rate.
lets say at least 20khz which is above audible at my age and seems to
be about the switching frequency used in several drives.
On Tuesday, October 17, 2017 at 10:14:17 PM UTC+2, Pauluzs wrote:
Hi all,
Currently i'm looking into driving 3 phase (steppers) motors on 3
axis with encoders the Beaglebone.
This because i got several 3 phase pm bldc motors, some small 48v
ac servo's and 2 large 220v ac servo's i would like to drive.
While looking into the 3 phase bldc steppers the idea came it
would potentially also being able to support ac servo's.
After making a pinmux layout it would be possible to connect:
3 encoders eqep A/B/INDEX (or 3 hall sensors on the same inputs)
6 PRU 0 signals U/V/W phase hi and low
12 PRU 1 signals U/V/W phase hi and low
This would mean each phase could have a hi and low pru capable pin
driving it.
Using discrete power components it would be cheap and simple to
build a drive.
Or power driver IC such as the International Rectifier [IRAMS]
<https://ec.irf.com/v6/en/US/adirect/ir?cmd=eneNavigation&N=0+4294841618>
(according
to http://wiki.linuxcnc.org/cgi-bin/wiki.pl?BLDC
<http://wiki.linuxcnc.org/cgi-bin/wiki.pl?BLDC>)
There are some questions i run into:
Can the beaglebone/machinekit even keep up with this amount of
pwm pins?
Should i use the pru stepgen code? (stepgen does not seem to
support 3 phase)
Should i use the pru pwm code?
Use the bldc component with standard writes?
Or use the bldc component with pru_pwm?
Usefull thoughts or comments are most welcome,
Thanks,
Paul
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