Hi.
I have a cuestion about same project that I asked a month ago: What is a frequency to gate of mosfet?? I am working with a frecuency PWm of 40KHz.
Very thank.
20 Khz seems to be the most commonly used PWM frequency, I think the higher frequency rates are mainly for low inductance motor's.
Russell.
I finally got some time to work on some of this..
I added current limit although untested - I have to make a board next.
http://www.electronicsam.com/images/.../newschem5.png
Samco: It looks very impressive. Is there any specific reason to use IR2183 instead of IR2111 as Gate Driver ?
Cristobal
Sorry, I made a mistake writing IR2183;it should be IR2184.
Hey Samco,
Just a quick note:
Sorry to be out of touch for the summer. I will have more time to finish my board this winter, and will post the results.
Yes, I do have the Eagle files. I think I linked to them in a previous post, but I will check and re-post again.
Tom
Some progress. I think the board may require a few tweeks. Working so far.
"http://au.youtube.com/watch?v=fGF07oVkl6M"]YouTube - EMC2 closed loop test with simple h-bridge and pluto-p
"http://au.youtube.com/watch?v=eUmFKOVepYY"]YouTube - Servo h-bridge running with emc2
It's looking good - congratulations!
deleted
Last edited by vrsculptor; 11-10-2008 at 10:15 PM.
Hey Samco,
FYI, here is a link to the final Eagle files that I made. Also contained is a copy of my library file so you won't get missing symbols and defs. There are also some Adobe Illustrator files, Excellon drill files, and dxfs for the film, etc. This link will prompt you to download the 4.5 megabyte zip file.
Hope this helps.
Tom
btw. When you hook up your pins to the HalScope pictured above, what pins are you using as defined in HAL, and what are you using for the trigger? I have not been able to set this up to trigger properly and see meaningful results.
Any info here would be very helpful.
Hello all,
I just got an email that the link that I posted above does not work.
For some reason the CNC zone servers have software daemons the remove
the underscores from the links & filenames that I have tried to post above.
I do not have the ability to change the folder names or file names of the source files, so at this time, I cannot fix the above link.
Sorry!
Tom
Last edited by kestreltom; 01-24-2009 at 12:30 AM. Reason: unable to fix file link
Tom,
I just added underscores between final and eagle and eagle and files and it worked for me. They aren't visible in the link because of the underlining.
http://www.foxpointdesign.com/cnc_st...agle_files.zip
Alan
mine has gone thru a few re-designs.. I think this is the final. This was the latest tests. You can hear it current-limiting on revearsals... I totally space out negative voltages across the sense resistor getting into the lm393. That put it into an unknown state. go figure . The video is after I had that revelation.. but adding the diode (schottcy) and a few bypass caps made me re-think the layout again. I wanted the mosfets to set against the back of the circuit board and isolate the isolators better. Getting there. Having fun (hope to mill the new board today)
"http://www.youtube.com/watch?v=qY-FCN5ZXkg"]YouTube - PICT1396
http://www.electronicsam.com/images/...wcurrentlimit/
Peter! Good to see you here. Yes - that quote is pretty old. The work on the hostmot2 firmware is awesome... hardware stepgen is also available with it. (plus it is just more flexable)
after I get the bugs worked out with the amps - I have a nice set of 5i20 cards that will do the hard work.
sam
aka skunkworks on irc.