Model Boat Mayhem

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: motor surpression  (Read 2523 times)

jaguarfold

  • Guest
motor surpression
« on: August 27, 2010, 10:27:40 am »

OK this may be a daft question to all in the know but i don't know so here goes why do we need to suppress motors and how do you know what parts to use to do the job?
Logged

sailorboy61

  • Guest
Re: motor surpression
« Reply #1 on: August 27, 2010, 10:54:06 am »

New to this myself, but looking around a 'typical' DIY setup is three 0.1uf ceramic capacitors...... one from each terminal to the case, and the other between the terminals themself.
At least I'm hoping so now I have a whole bunch of cheap capacitors...thanks Ebay!
Logged

malcolmfrary

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 6,027
  • Location: Blackpool, Lancs, UK
Re: motor surpression
« Reply #2 on: August 27, 2010, 11:04:43 am »

Theres lots of threads about this, but -
Any inductive load which is switched on an off (which includes, but is not limited to motors and relays) produces a resonant signal in its wiring.  Since this is a broad radio frequency signal, the wiring acts as a transmitting aerial, providing a locally strong signal very close to the receiving aerial.  Motors with brushes are most likely to introduce this unwanted signal, known as "noise", which the receiver will do its best to resolve as an instruction.  
Motors with poorly designed/engineered brushes and commutators have the ability to make more noise.  The addition of suppression components restricts the signal produced by the motor, hopefully, to the motor and stops it transmitting.  Capacitors form what is effectively a short circuit for the radio frequency signal, inductors placed in the leads form a DC blocking component.
You can, if you really want to, calculate optimum values, or you could do it the easy way like the rest of us, and do a search on an appropriate forum to find out what works for everybody else.  Or just look on the local hobby shop shelf for a pack of suppressor capacitors.  Sometimes, you even get instructions in the box that the motor came in.
Logged
"With the right tool, you can break anything" - Garfield

John W E

  • I see no ships !!
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 8,813
  • Location: South shields
Re: motor surpression
« Reply #3 on: August 27, 2010, 11:10:18 am »

This may help it from the : PLAN BUILD NUMBER 4: DRIFTER/TRAWLER FREDERICK SPASHETT  build

aye

john
bluebird
Logged
Knowledge begins with respect
But fools hate wisdom and discipline

DickyD

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 9,423
  • www.srcmbc.org.uk
  • Location: Southampton UK
    • SRCMBC
Re: motor surpression
« Reply #4 on: August 27, 2010, 01:08:37 pm »

This may help it from the : PLAN BUILD NUMBER 4: DRIFTER/TRAWLER FREDERICK SPASHETT  build

aye

john
bluebird
Another "Here's one I did earlier" from John Elsey model maker and author extrordinaire.
Logged
Richard Solent Radio Controlled Model Boat Club http://www.srcmbc.org.uk

Peterm

  • Inactive
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 414
  • Location: Southam,Warwickshire
Re: motor surpression
« Reply #5 on: August 27, 2010, 03:05:37 pm »

Try Action electronics (FLJ on this forum)  Pete M
Logged
I`m not just old, I`m ancient

Peterm

  • Inactive
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 414
  • Location: Southam,Warwickshire
Re: motor surpression
« Reply #6 on: August 27, 2010, 03:23:14 pm »

Sorry,  should have said `see Traders Directory on this forum`.   Pete M
Logged
I`m not just old, I`m ancient
Pages: [1]   Go Up
 

Page created in 0.103 seconds with 23 queries.