Electronics > Projects, Designs, and Technical Stuff

Massive EMI issues

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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.

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