LC filter for DC motor

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Boris

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Hi everybody!
I built couple drivers for DC motors.(use motors 3-5 V from POLOLU).Works very good,but motor makes noise for RF devices.I know a lot of schematics of filtrs ,but I want to know your opinions and your expiriens in this field.
I 'll appriciative if somebody give me diagrams.
Thank's
 
I'd use shorter wiring with more high frequency decoupling capacitors and snubbers before I would try placing anything else in series with the motor- that's expensive and lossy. You can also try increasing the rise and fall times of the MOSFETs in the driver.
 
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HF decoupling caps at the motor.

twist the wires as tight as you can

put ferrite emi beads at both ends

That thing is a bit of a dinosaur. It takes up to 70mA from your main supply and up to 36mA from your logic supply just to steal up to 5V from your motor!
 

Correction. Faster rise and fall times make more RF noise.
 
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