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Author Topic: RFI Suppression  (Read 2456 times)

Triton

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RFI Suppression
« on: September 30, 2009, 07:55:04 pm »

Hi,

I've just been reading an interesting article on RFI suppression in fast electrics on the Model Solutions Canada website, where they suggest fitting RFI suppression capacitors, ferrite beads, TVS's and grounding the motor cans and negative supply wires via the prop tube.

Would it be over the top to fit all these devices in a small (20") scale tug (385 motors on 6V supply, 35mm pops)?

John
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DickyD

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Re: RFI Suppression
« Reply #1 on: September 30, 2009, 08:04:20 pm »

Yes.

Capacitors on the motor only ones needed. :-))
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stallspeed

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Re: RFI Suppression
« Reply #2 on: September 30, 2009, 08:19:24 pm »

I'll give you two more links with contradictory opinions.

Read 4.1 http://robots.freehostia.com/Emc/EmcBody.html#4.1

A few lines further down in the link section,5 http://robots.freehostia.com/Emc/EmcBody.html#5
There is a link called "Technobots - "EMI and how to deal with it" by Tim Mann"
Read the top of page 5.
 %)

Here is my opinion.
A single,10 to 100nF, low-K dielectric ceramic capacitor across the motor.
With sparky ex-vehicle motors,further add a Nickel Manganese sleeve type suppressor on each of the two esc- motor wires.
Twist wires in pairs.
That's it.
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DickyD

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Re: RFI Suppression
« Reply #3 on: September 30, 2009, 08:29:00 pm »

He's using 385 motors, probably not sparky vehicle motors.
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stallspeed

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Re: RFI Suppression
« Reply #4 on: September 30, 2009, 08:45:42 pm »

He's using 385 motors, probably not sparky vehicle motors.
Yup!
A 2 pence  capacitor is all that is needed there,John.

If you don't have any to spare,there are plenty inside electronic equipment,with the exception of computer parts.
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malcolmfrary

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Re: RFI Suppression
« Reply #5 on: September 30, 2009, 10:17:39 pm »

He's using 385 motors, probably not sparky vehicle motors.
I've yet to find a "sparky vehicle motor".  Perhaps some folks are just using scrapyard motors that should have stayed there?  I have found several "alternative" source motors from cheapo power tools and the like that were probably rubbish when first made, and were resistant to any attempts at suppression.
100pF across the motor terminals has always done it for me, but again, it could be that I don't demand too much from my motors.
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"With the right tool, you can break anything" - Garfield
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