Reduce EMI generated by old AC motor from an electric knife
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I have an old electric knife (220V 50Hz) which seems to produce a lot of EMI.
Some clues on that were a "bzzzz" noise from PC speaker I noticed sometimes when someone use it.
Recently I bought a device which has touch-buttons and I noticed when the knife is in use the device detect false touch. So at this point I think that knife produce a lot of EMI (maybe due to it is an old model?)
So, I would ask: is there any way to reduce them (capacitor on AC motor,..)?
Or can I make a sort of shield?
(eg. whith alluminium sheets glued inside the plastic cover).
Please don't suggest to replace it :) the question is just to know something more about EMI, shielding, etc..
motor emi-filtering
asked 1 hour ago
NoisemakerNoisemaker
123114
$endgroup$
add a comment |
$begingroup$
I have an old electric knife (220V 50Hz) which seems to produce a lot of EMI.
Some clues on that were a "bzzzz" noise from PC speaker I noticed sometimes when someone use it.
Recently I bought a device which has touch-buttons and I noticed when the knife is in use the device detect false touch. So at this point I think that knife produce a lot of EMI (maybe due to it is an old model?)
So, I would ask: is there any way to reduce them (capacitor on AC motor,..)?
Or can I make a sort of shield?
(eg. whith alluminium sheets glued inside the plastic cover).
Please don't suggest to replace it :) the question is just to know something more about EMI, shielding, etc..
motor emi-filtering
asked 1 hour ago
NoisemakerNoisemaker
123114
$endgroup$
2
$begingroup$
A straight X-capacitor over the motor like you suggest would be a good start if there isn't one already. Remeber to place an R in parallel if not built in. In the EU you would be required to bleed down to some voltage (~50 V) within one second or you will get nasty shocks from the plug if you toutch it once unplugged. How eager/knowledgable are you in this feild? Aluminium foil won't do crap here.
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– winny
1 hour ago
$begingroup$
The motors in most counter-top and hand-hand, AC appliances and tools are universal motors. A universal motor is a DC motor with a commutator that has been adapted to operate on either AC or DC. It is the sparking from the commutator that causes the EMI.
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– Charles Cowie
1 hour ago
$begingroup$
@CharlesCowie yep, I also supposed the sparks generated by brushed motors may be the cause... in that case there's no filtering circuit which can avoid that, right?
$endgroup$
– Noisemaker
1 hour ago
$begingroup$
electronics.stackexchange.com/questions/274991/… electronics.stackexchange.com/questions/237209/…
$endgroup$
– Charles Cowie
52 mins ago
add a comment |
$begingroup$
I have an old electric knife (220V 50Hz) which seems to produce a lot of EMI.
Some clues on that were a "bzzzz" noise from PC speaker I noticed sometimes when someone use it.
Recently I bought a device which has touch-buttons and I noticed when the knife is in use the device detect false touch. So at this point I think that knife produce a lot of EMI (maybe due to it is an old model?)
So, I would ask: is there any way to reduce them (capacitor on AC motor,..)?
Or can I make a sort of shield?
(eg. whith alluminium sheets glued inside the plastic cover).
Please don't suggest to replace it :) the question is just to know something more about EMI, shielding, etc..
motor emi-filtering
asked 1 hour ago
NoisemakerNoisemaker
123114
$endgroup$
I have an old electric knife (220V 50Hz) which seems to produce a lot of EMI.
Some clues on that were a "bzzzz" noise from PC speaker I noticed sometimes when someone use it.
Recently I bought a device which has touch-buttons and I noticed when the knife is in use the device detect false touch. So at this point I think that knife produce a lot of EMI (maybe due to it is an old model?)
So, I would ask: is there any way to reduce them (capacitor on AC motor,..)?
Or can I make a sort of shield?
(eg. whith alluminium sheets glued inside the plastic cover).
Please don't suggest to replace it :) the question is just to know something more about EMI, shielding, etc..
motor emi-filtering
motor emi-filtering
asked 1 hour ago
NoisemakerNoisemaker
123114
asked 1 hour ago
NoisemakerNoisemaker
123114
asked 1 hour ago
NoisemakerNoisemaker
123114
asked 1 hour ago
NoisemakerNoisemaker
123114
asked 1 hour ago
NoisemakerNoisemaker
123114
123114
2
$begingroup$
A straight X-capacitor over the motor like you suggest would be a good start if there isn't one already. Remeber to place an R in parallel if not built in. In the EU you would be required to bleed down to some voltage (~50 V) within one second or you will get nasty shocks from the plug if you toutch it once unplugged. How eager/knowledgable are you in this feild? Aluminium foil won't do crap here.
$endgroup$
– winny
1 hour ago
$begingroup$
The motors in most counter-top and hand-hand, AC appliances and tools are universal motors. A universal motor is a DC motor with a commutator that has been adapted to operate on either AC or DC. It is the sparking from the commutator that causes the EMI.
$endgroup$
– Charles Cowie
1 hour ago
$begingroup$
@CharlesCowie yep, I also supposed the sparks generated by brushed motors may be the cause... in that case there's no filtering circuit which can avoid that, right?
$endgroup$
– Noisemaker
1 hour ago
$begingroup$
electronics.stackexchange.com/questions/274991/… electronics.stackexchange.com/questions/237209/…
$endgroup$
– Charles Cowie
52 mins ago
add a comment |
2
$begingroup$
A straight X-capacitor over the motor like you suggest would be a good start if there isn't one already. Remeber to place an R in parallel if not built in. In the EU you would be required to bleed down to some voltage (~50 V) within one second or you will get nasty shocks from the plug if you toutch it once unplugged. How eager/knowledgable are you in this feild? Aluminium foil won't do crap here.
$endgroup$
– winny
1 hour ago
$begingroup$
The motors in most counter-top and hand-hand, AC appliances and tools are universal motors. A universal motor is a DC motor with a commutator that has been adapted to operate on either AC or DC. It is the sparking from the commutator that causes the EMI.
$endgroup$
– Charles Cowie
1 hour ago
$begingroup$
@CharlesCowie yep, I also supposed the sparks generated by brushed motors may be the cause... in that case there's no filtering circuit which can avoid that, right?
$endgroup$
– Noisemaker
1 hour ago
$begingroup$
electronics.stackexchange.com/questions/274991/… electronics.stackexchange.com/questions/237209/…
$endgroup$
– Charles Cowie
52 mins ago
2
2
$begingroup$
A straight X-capacitor over the motor like you suggest would be a good start if there isn't one already. Remeber to place an R in parallel if not built in. In the EU you would be required to bleed down to some voltage (~50 V) within one second or you will get nasty shocks from the plug if you toutch it once unplugged. How eager/knowledgable are you in this feild? Aluminium foil won't do crap here.
$endgroup$
– winny
1 hour ago
$begingroup$
A straight X-capacitor over the motor like you suggest would be a good start if there isn't one already. Remeber to place an R in parallel if not built in. In the EU you would be required to bleed down to some voltage (~50 V) within one second or you will get nasty shocks from the plug if you toutch it once unplugged. How eager/knowledgable are you in this feild? Aluminium foil won't do crap here.
$endgroup$
– winny
1 hour ago
$begingroup$
The motors in most counter-top and hand-hand, AC appliances and tools are universal motors. A universal motor is a DC motor with a commutator that has been adapted to operate on either AC or DC. It is the sparking from the commutator that causes the EMI.
$endgroup$
– Charles Cowie
1 hour ago
$begingroup$
The motors in most counter-top and hand-hand, AC appliances and tools are universal motors. A universal motor is a DC motor with a commutator that has been adapted to operate on either AC or DC. It is the sparking from the commutator that causes the EMI.
$endgroup$
– Charles Cowie
1 hour ago
$begingroup$
@CharlesCowie yep, I also supposed the sparks generated by brushed motors may be the cause... in that case there's no filtering circuit which can avoid that, right?
$endgroup$
– Noisemaker
1 hour ago
$begingroup$
@CharlesCowie yep, I also supposed the sparks generated by brushed motors may be the cause... in that case there's no filtering circuit which can avoid that, right?
$endgroup$
– Noisemaker
1 hour ago
$begingroup$
electronics.stackexchange.com/questions/274991/… electronics.stackexchange.com/questions/237209/…
$endgroup$
– Charles Cowie
52 mins ago
$begingroup$
electronics.stackexchange.com/questions/274991/… electronics.stackexchange.com/questions/237209/…
$endgroup$
– Charles Cowie
52 mins ago
add a comment |
1 Answer
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oldest
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$begingroup$
Sounds like you have low frequency conducted EMI. An X-capacitor straight over the motor would be the first order of business, but I've included the steps I would have taken down the line (litterally).
simulate this circuit – Schematic created using CircuitLab
Couldn't find a symbol for you motor, nor lines to draw a correct CM choke.
All values are estimations, but at least not several orders of magnitude off.
answered 1 hour ago
winnywinny
4,64931831
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add a comment |
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1 Answer
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active
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1 Answer
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active
oldest
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$begingroup$
Sounds like you have low frequency conducted EMI. An X-capacitor straight over the motor would be the first order of business, but I've included the steps I would have taken down the line (litterally).
simulate this circuit – Schematic created using CircuitLab
Couldn't find a symbol for you motor, nor lines to draw a correct CM choke.
All values are estimations, but at least not several orders of magnitude off.
answered 1 hour ago
winnywinny
4,64931831
$endgroup$
add a comment |
$begingroup$
Sounds like you have low frequency conducted EMI. An X-capacitor straight over the motor would be the first order of business, but I've included the steps I would have taken down the line (litterally).
simulate this circuit – Schematic created using CircuitLab
Couldn't find a symbol for you motor, nor lines to draw a correct CM choke.
All values are estimations, but at least not several orders of magnitude off.
answered 1 hour ago
winnywinny
4,64931831
$endgroup$
add a comment |
$begingroup$
Sounds like you have low frequency conducted EMI. An X-capacitor straight over the motor would be the first order of business, but I've included the steps I would have taken down the line (litterally).
simulate this circuit – Schematic created using CircuitLab
Couldn't find a symbol for you motor, nor lines to draw a correct CM choke.
All values are estimations, but at least not several orders of magnitude off.
answered 1 hour ago
winnywinny
4,64931831
$endgroup$
Sounds like you have low frequency conducted EMI. An X-capacitor straight over the motor would be the first order of business, but I've included the steps I would have taken down the line (litterally).
simulate this circuit – Schematic created using CircuitLab
Couldn't find a symbol for you motor, nor lines to draw a correct CM choke.
All values are estimations, but at least not several orders of magnitude off.
answered 1 hour ago
winnywinny
4,64931831
answered 1 hour ago
winnywinny
4,64931831
answered 1 hour ago
winnywinny
4,64931831
answered 1 hour ago
winnywinny
4,64931831
4,64931831
add a comment |
add a comment |
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$begingroup$
A straight X-capacitor over the motor like you suggest would be a good start if there isn't one already. Remeber to place an R in parallel if not built in. In the EU you would be required to bleed down to some voltage (~50 V) within one second or you will get nasty shocks from the plug if you toutch it once unplugged. How eager/knowledgable are you in this feild? Aluminium foil won't do crap here.
$endgroup$
– winny
1 hour ago
$begingroup$
The motors in most counter-top and hand-hand, AC appliances and tools are universal motors. A universal motor is a DC motor with a commutator that has been adapted to operate on either AC or DC. It is the sparking from the commutator that causes the EMI.
$endgroup$
– Charles Cowie
1 hour ago
$begingroup$
@CharlesCowie yep, I also supposed the sparks generated by brushed motors may be the cause... in that case there's no filtering circuit which can avoid that, right?
$endgroup$
– Noisemaker
1 hour ago
$begingroup$
electronics.stackexchange.com/questions/274991/… electronics.stackexchange.com/questions/237209/…
$endgroup$
– Charles Cowie
52 mins ago