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Topic: Reducing AC Motor Mains Line Noise (Read 2902 times) previous topic - next topic


I currently have a AC pump (120V 2amp) that is generating alot of mains line noise. I would like to place a filter at the pumps plug but i'm not sure what would work best there.

Should I be getting a Line Filter like this?


Or should I be looking at things like Surge Suppression \ Protection like MOVs when dealing with AC motors?


Do you know the frequency of your noise? Your proposed filter doesn't seem to suppress much below 100 kHz or so.

The Rugged Motor Driver: two H-bridges, more power than an L298, fully protected


I don't, is there an easy way of testing it?

The main reason I'm going this is the noise is making its way through a relay, over a optocoupler and into my arduino. It shows up as 2-4 volt swings on the arduino 5V rails when I power up or turn off the pump.


Yikes, that's not "noise", that's inadequate wiring infrastructure. Are you in an old house? Do the lights dim as well?

The Basic Motor Driver: simple, inexpensive motor driver for 1 stepper motor or 2 DC motors


It's a five year old condo and fully up to spec, its just a really noisy pump. Here is the background thread.

I removed the noise by using this circuit I had laying around:

But I think its overkill and just want a more "sized" solution.

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