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-   -   Suppression caps on sewing machine motors - needed? (https://www.vintage-radio.net/forum/showthread.php?t=178679)

avocollector 8th Apr 2021 11:14 am

Suppression caps on sewing machine motors - needed?
 
Got a nice metal bodied sewing machine electric motor 230v 5Amp 30 watt model (think it's Sew brand) to use with a minature lathe milling head (Emco Unimat 3 part) I have. Connected it all up to the mains for a tryout and everything was fine except one of the mains suppression caps went bang with a vengence - ruptured and brown goo everywhere.

How essential are these to supress rf??? Tempted to not bother replacing it as the motor will be only used in my shed and on a isolating transformer supply.

Sideband 8th Apr 2021 12:49 pm

Re: Suppression caps on sewing machine motors - needed?
 
They might also help reducing brush sparking so reduce brush wear. I'd be inclined to replace them.

G6Tanuki 8th Apr 2021 7:27 pm

Re: Suppression caps on sewing machine motors - needed?
 
I'd definitely replace the suppressor-capacitors; who knows, you might just have a radio-ham or legacy SW/MW/LW-radio-listener living locally who might come round and poke you repeatedly with a pungee-stick if you blot-out his/her radio-reception.

avocollector 9th Apr 2021 12:07 pm

Re: Suppression caps on sewing machine motors - needed?
 
Thanks for those ideas folks - so the answer is clearly yep to replace.

Maarten 9th Apr 2021 10:48 pm

Re: Suppression caps on sewing machine motors - needed?
 
Try to find a polypropylene (MKP) replacement instead of a paper cap which might be old stock and fail again soon.


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