DIY Servo controller

[quochung11]

I want to find schematic controller board using IR2184, duty cycle PWM reach to 100% or not?

[LZ1TWB]

What are you trying to do? 2184 is a half bridge driver with internal dead-time. Search the datasheet for an accurate info.

Actually the old UHU board uses this driver, you may want to see its schematic earlier in this thread.

Todor

[krazatchu]

The ir2184 cannot do 100% duty due to the on board charge pump...

[amer4580]

thankssssssssssssssssssss

[nursiti2009]

let's goooo.... just reading...

[rajshinai]

Originally Posted by Anantha Narayan Hi there! To anyone this may have meaning for. I am not even sure how to go about interacting on this forum - this is my first attempt at communicating with all those wizards out there in the whole world! First, what I want. We have built our first special purpose CNC engraving machine - 3 axis. This is with the help of colleagues. We had no problem in finalising the mechanical design. When it came to the CNC system and its elements, we tried to talk to many persons but no one was available for help. We finally decided to contact Siemens and bought the complete system elements that they suggested. This was very expensive - we tried our best to contact some Chinese or Taiwanese suppliers but did not get any response. We then got a consultant to interface the Siemens system (Sinumeric 802-D) with the machine that we had fabricated. The problem here has been that the this has been so time consuming. Even more than 10 weeks after all the electronics arrived from Siemens, our machine is still not ready for a trial! I know it will get ready in course of time, but it has cost us a lot both in terms of money and time. I also feel that we may have over-specified the elements in the CNC system. Our objective is not to build machines for sale or for hobby but for our own internal use. We are a small company needing a lot of 3, 4 & 5-axis CNC milling. We do not have the money to buy the machines on the market for our kind of application. Our objective is the following: 1. Be able to define the specifications of the elements of the CNC system like servo motors, controllers, transducers, cables, connectors, etc. 2. We want to source the individual items separately from different manufacturers at the best prices - maybe even used and/or refurbished items for cost effectiveness. 3. Understand from the suppliers of the elements how they are to be integrated - we would need outside help but do not want to be dependent on their mercy! I have said a lot for a first post. If anyone responds, I shall give a lot more info about us and what we have done so far. I am 64 years old and head a group of engineers who are doing this more for the challenge and the opportunity to learn. Looking forward to someone's help. Anantha Narayanan Hyderabad, India

I know its a very late for me to reply on this thread...but i can help u with sourcing servo motors, controllers n other parts (new and refurbished)...
Been purchsing a lot of these things from different places since a long time!

[MrWild]

Please! Don't ever become an Emergency Response Team Member. A year and a half isn't a little late.

[rajshinai]

Wow tht was a real quick reply from you bro...

Guess i should be spending more time checking my mails than doing other stuff now..but its just like that in my time zone.

Neways, jus trying to help anyone who's finding it difficult to source parts.

regards!

[ifsercon]

Maybe I can't see the forest for the trees...

I want to use the bridge circuit from UHU HP in another servo(modified Elm-Chan).
Looking for two days at UHU schematic it seems to me it can work correctly only if it NEVER
hits the current limit during positive level of PWM signal applied on pin 3 (CLOCK) of U6A(CD4013).
I'am thinking to insert a XOR gate as frequency doubler (or two diodes )between PWM line and pin 3 of U6A to get true cycle by cycle current limit.

Is this correct ?

[krazatchu]

I've been working on an Open Source DC servo system that will be released under GPL.

I'd like to share my progress as well as receive feedback, criticisms and recommendations.

The project, and most recent posting is located here: http://n0m1.com/2011/12/31/dc-servo-in-a-state-of-motion/

Thanks for your interest,
Michael