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Soldering suppressors to the motor

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Paul Godfrey16/07/2009 19:00:02
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Hi folks
 
Having a bit of a problem with soldering RFI Suppressors to my motor.
 
No problem with the terminals, but struggling with the motor casing which acts as a big heat sink, and is difficult therefore to get sufficient heat for the solder to 'take'. My soldering iron is 30w.
 
Any advice would be much appreciated.
 
Paul

Edited By Paul Godfrey on 16/07/2009 19:00:23

Tony Hadley16/07/2009 21:32:26
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Paul,
 
A common problem, as it is difficult to heat the motor casing.
I use a simple cable tie, or alternative binding, as a mechanical fixing method. Some use a jubilee clip.
 
Hope this helps,
Tony.
 
 

Edited By Tony Hadley on 16/07/2009 21:32:47

Barry Foote17/07/2009 08:20:12
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Try roughing up the casing with a file where you want to solder to. This concentrates the heat somewhat and helps the solder stick.
Paul Godfrey17/07/2009 17:46:21
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Thanks for your comments guys, much appreciated.
 
I'll give the casing a roughen-up and try this first, but if I still have problems, the Jubilee clip/cable tie idea sounds a very good solution.
 
Paul
Colin Bishop17/07/2009 18:37:39
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Another possibility, depending on the motor is to use a small solder tag where the mounting screw screws into the front of the motor.
 
Colin
ashley needham17/07/2009 19:24:03
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I use a large powerful soldering iron, and gently buff up the patch to be soldered with fine wire wool in order to clean it (but dont rub the plating off) I also use some soldering fluid/flux and a non-cored solder.  So saying, some motors just dont seem to want to be soldered to!   If you are using a standard L shaped motor mount, and screws the easiest way would be to use the screws as terminals and attatch the wires to them. Ashley
ashley needham17/07/2009 19:24:47
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whoops.. repeating Colins suggestion !!
Colin Bishop17/07/2009 22:05:48
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Glad you noticed Ashley!
 
Great minds think alike.
 
Colin
Paul Godfrey17/07/2009 22:37:45
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Thanks all.
 
Ashley - what wattage is the iron you use?
 
Paul
Phil Abbott17/07/2009 22:55:36
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The other way which also works for soldering onto tags on batteries (as you don't want to keep to much heat going into a battery) is the method I use. Take a piece of steel about 1/4 inch square and at least 6in long (although any steel stick would do)
Heat to bright cherry red with a blow torch (hold metal with pliers !!!) you now have a very hot soldering tip (hotter than any iron can get to) and use this to solder to the motor casing. You will find you only have to touch it, as it is very hot, the casing doesn't really have time to work as a heat sink.

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