Model Boat Mayhem

Technical, Techniques, Hints, and Tips => DC Motors (Brushed) and Speed Controllers => Topic started by: JamesD on January 09, 2015, 10:36:33 pm

Title: Suppressors
Post by: JamesD on January 09, 2015, 10:36:33 pm

Anyone tell me what supressors would I need for 2 MFA Torpedo 800 motors

Title: Re: Suppressors
Post by: inertia on January 10, 2015, 08:59:11 am

 
http://www.componentshop.co.uk/large-rfi-kit.html (http://www.componentshop.co.uk/large-rfi-kit.html)

(http://www.componentshop.co.uk/media/catalog/product/cache/1/thumbnail/46fffc6ec290d7a41e3b10dbd6f6ae60/8/0/800_big_rfi_kit.jpg)

Title: Re: Suppressors
Post by: JamesD on January 10, 2015, 09:54:56 am

Many thanks for that. :-))

Title: Re: Suppressors
Post by: Brian60 on January 12, 2015, 07:25:34 pm

Dave is it necessary to still use capacitors on motors with the 2.4 systems now prevalent? I think I read someplace that they are not affected by motor 'spikes'

Title: Re: Suppressors
Post by: Netleyned on January 12, 2015, 07:36:14 pm

The guy next to you on the lake could be on 27 or 40.
It could be possible that you could interfere with his
operation.

Ned

Title: Re: Suppressors
Post by: RAAArtyGunner on January 12, 2015, 08:57:04 pm

Makes sense that if suppressed, then you can forget about the type of Radio, even when switching motors to other boats or using other Radios. O0 O0 O0

Title: Re: Suppressors
Post by: inertia on January 12, 2015, 11:12:59 pm

Quote from: Brian56 on January 12, 2015, 07:25:34 pm

Dave is it necessary to still use capacitors on motors with the 2.4 systems now prevalent? I think I read someplace that they are not affected by motor 'spikes'

Brian
Those capacitors do two jobs. One is to reduce/remove the effect of sparking at the brush/commutator which causes RFI. This isn't a problem with 2G4 radios because of the frequency of the sparks BUT the second one is to smooth out any voltage spikes in the back EMF from the motor - and this can affect any radio, so best to fit them. Brushless motors are subject to entirely different rules.
Dave M

Title: Re: Suppressors
Post by: Brian60 on January 13, 2015, 03:16:31 pm

Thanks for clearing that up Dave.