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Author Topic: motor surpression  (Read 1711 times)

jaguarfold

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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?
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sailorboy61

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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!
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malcolmfrary

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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.
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John W E

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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
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DickyD

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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.
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Peterm

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Re: motor surpression
« Reply #5 on: August 27, 2010, 03:05:37 PM »

Try Action electronics (FLJ on this forum)  Pete M
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Peterm

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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
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