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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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24th Sep 2022, 8:01 pm | #1 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Hoover suppressor
Hi everyone,
I need to change the suppressor on a 40 year old hoover porta power. I know you can just remove them but I don't like the idea of it, they are there to stop interference and minimise sparks on the brushes, however I have no idea what to look for in a replacement. Can anyone please help. |
24th Sep 2022, 9:44 pm | #2 |
Octode
Join Date: Oct 2003
Location: Newbury, Berkshire, UK.
Posts: 1,770
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Re: Hoover suppressor
If worst comes to worse, you could make one up with separate caps -
X2 0.0047uF "Y" type to ground X1 0.1uF "X" type across the supply As per the diagram on the suppressor. You might even be able to fit them in the original can.
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Chris |
25th Sep 2022, 12:05 am | #3 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
Possibly a bit beyond me, a direct replacement would be better but what to go for
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25th Sep 2022, 8:20 am | #4 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,657
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Re: Hoover suppressor
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Curiosity hasn't killed this cat...so far. |
25th Sep 2022, 10:38 am | #5 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
That's a bit steep price wise. 😳
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25th Sep 2022, 11:15 am | #6 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Hoover suppressor
I know a place where you can get a real human on the phone.
It is my go to place for appliance spares. https://www.google.com/maps/place/Ba...6!4d-1.4275855 |
25th Sep 2022, 11:17 am | #7 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
😃 thanks 👍
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25th Sep 2022, 2:38 pm | #8 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
What are your thoughts on this?
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25th Sep 2022, 2:48 pm | #9 |
Octode
Join Date: Oct 2003
Location: Newbury, Berkshire, UK.
Posts: 1,770
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Re: Hoover suppressor
Well it's better than nothing, but it won't have the same characteristics as the original as that also has two 0.005 uF caps to ground.
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Chris |
25th Sep 2022, 3:19 pm | #10 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
This is what's confusing me, there is no ground on the machine or dose that just mean the motor casting?
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25th Sep 2022, 3:25 pm | #11 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
Found this one. Just a thought the dyson motors have a yellow 2 pin suppressor fitted could I use something like that ? As long as it doesn't interfere with FM or anything else or burn the brushes I will be happy.
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27th Sep 2022, 9:07 pm | #12 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Hoover suppressor
RS do a suitable value three legged RIFA "smoke bomb" (probably OK for ~10+ years)
https://uk.rs-online.com/web/p/film-capacitors/0239668
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
29th Oct 2022, 5:18 pm | #13 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
Brilliant thanks 😊
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1st Nov 2022, 9:24 pm | #14 |
Hexode
Join Date: Apr 2021
Location: Crawley, West Sussex, UK.
Posts: 442
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Re: Hoover suppressor
Does this sort of capacitor actually suppress sparks on an AC motor?
Wouldn't you need a CR series combination? On interference, although I am a bit of a bandit for chasing down RFI ruining my MW/LW/SW/VHF, I'm not sure even I'd bother with interference suppression on an intermittently used device.
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Richard | BVWS & RSGB member | |
1st Nov 2022, 11:16 pm | #15 |
Triode
Join Date: Nov 2021
Location: Hinckley, Leicestershire, UK.
Posts: 22
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Re: Hoover suppressor
Well they were fitted for a reason, so I would rather replace.
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2nd Nov 2022, 1:04 am | #16 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Hoover suppressor
They reduce sparking of the brushes increasing their life.
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2nd Nov 2022, 8:28 am | #17 |
Hexode
Join Date: Apr 2021
Location: Crawley, West Sussex, UK.
Posts: 442
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Re: Hoover suppressor
Understand entirely.
Aside potential reduction in sparking at the commutator, I do recall they were fitted for Radio and TV Interference suppression, and in fact to comply with legislation for which there were BS guidance booklets: BS 613: 1955 "Specification for the Components and Filter Units for Radio Interference Suppression" BS 2135: 1966 "Specification for Capacitors for Radio Interference Suppression" However I do note that"the move away from the VHF band for television transmission in the UK has lessened the likelihood of interference by any but the most severe equipment problems".
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Richard | BVWS & RSGB member | |
2nd Nov 2022, 8:43 am | #18 |
Hexode
Join Date: Apr 2021
Location: Crawley, West Sussex, UK.
Posts: 442
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Re: Hoover suppressor
I'm sure there may be a benefit as any ionisation on a carbon surface must result in some combustion, amd providing something to suppress the magnitude should help.
I actually did some research on this for small DC motors for model railways - where the same two arguments apply about RFI (principally) and brush life (secondarily). In that particular instance I was able to prove that RFI was significantly suppressed in magnitude by an appropriate value of across-motor capacitor. Further reductions relied on slightly more complicated LC networks, and/or more components applied to track connections and so on. At a fairly subjective level, sparking at the brushes was not visibly changed, but the RF output was objectively lower. Didn't run a long enough test to comment on brush life.
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Richard | BVWS & RSGB member | |