I am doing something similar. My pwm amp is only an h-bridge driven directly
from emc. Then the encoder feeds back.
emc2>printerport>h-bridge>motor>encoder>printerport>
^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<V
http://www.electronicsam.com/images/KandT/servostart/almost.JPG This was with a
lot of help from jmk. (I think it is a work of art)
The bit of playing I have done looks like it works very well. (emc2 doing the
pid)
Cradek has done this on his small laith with great results.
Although I have a pluto and mesa board that will be what actually gets used now
as I would like higher count encoders.
sam
----- Original Message -----
From: Larry Kopas
To: Enhanced Machine Controller (EMC)
Sent: Friday, February 23, 2007 3:39 PM
Subject: [Emc-users] pwm amplifier
hello
I am trying to build a h-bridge pwm driver for brush dc motor at 10 amp,
80vdc. the mesa card provide a pwm output and direction output. do I need a
torque/current loop on my board using opamps, or just switching motor voltage
via h-bridge pwm is enough for emc servo loop. I have a 500 count encoder on
the rotor shaft.
TIA
Larry
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