Electronics > Projects, Designs, and Technical Stuff
Massive EMI issues
<< < (3/4) > >>
madires:
Maybe a monolithic or X2Y EMI filter for the DC motors?
OM222O:

--- Quote from: madires on June 01, 2020, 02:31:21 pm ---Maybe a monolithic or X2Y EMI filter for the DC motors?

--- End quote ---

Would that be helpful at the H bridge end? I'm guessing not but I'm not sure
Also is that the same idea as applying 10nF caps between the grounded chassis and each terminal?
phil from seattle:
One of the problems with directly connecting to the encoders is those wires are antennas creating path for emi to enter the arduinos.  You could try a low pass RC filter per input - resistor and cap, cheap. Pick a cutoff frequency that is, say, twice your max frequency. Even better would be to use opto isolators and completely isolate your arduinos.

I agree with the ferrite suggestions above. Worth a try. You can never have too much EMI supression.

Shielded wiring is worth investing in. Make sure it's a star grounded configuration.

Eventually, you will need to get your power sorted out and filtered.
madires:

--- Quote from: OM222O on June 01, 2020, 03:46:33 pm ---Would that be helpful at the H bridge end? I'm guessing not but I'm not sure
Also is that the same idea as applying 10nF caps between the grounded chassis and each terminal?

--- End quote ---

No, they should be placed at the EMI source, i.e. at the DC motor. The idea is similar but they comprise two Y caps and one X cap in one package, and provide better performance.
OM222O:

--- Quote from: madires on June 01, 2020, 04:55:27 pm ---
--- Quote from: OM222O on June 01, 2020, 03:46:33 pm ---Would that be helpful at the H bridge end? I'm guessing not but I'm not sure
Also is that the same idea as applying 10nF caps between the grounded chassis and each terminal?

--- End quote ---

No, they should be placed at the EMI source, i.e. at the DC motor. The idea is similar but they comprise two Y caps and one X cap in one package, and provide better performance.

--- End quote ---

As you can see from the motor pictures that's not really possible. I will have a go at using the aluminized mylar + ferrites to see if that'd help. Will try the capacitors to chassis as well.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod