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Induction unit makes buzzing sound


Induction range vs gasIs copper cookware really better than stainless steel?Stainless Steel Pan — gray bottom. Why?Cast iron, forged iron or carbon steel pan for induction?Enameled Cast Iron vs Stainless Steel Roasting PansRoasting pan substitute / roasting rack for pork shoulder?Do induction cookers increase risk of cracking cast iron?Induction cooking pan bottom is concave - will this affect performance?Use non-inductive pans on induction cook topMy induction stove does not evenly heat a frying pan. Is it broken or am I doing something wrong?Non stick pan browning milk vs stainless steel






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8















I was fed up with the low quality electric hobs which are installed in my 1 meter wide "kitchen" (I forgot a crepe on the smaller one on the highest setting, and 25 min later it wasn't even browned, just dried a bit), so I recently bought a small induction cooking unit. It is a big improvement in terms of cooking convenience.



However, I noticed that with most cookware, it produces a strange buzzing sound. I don't mean the sound of the fan cooling the electronics. It produces a distinct fan-like sound, and I can clearly hear it when it works (it is self-regulated and doesn't blow all the time). But the buzzing occurs independently of the fan. It sounds like an old-fashioned phone, but not as loud and a bit muffled, as if the phone were under a duvet two rooms away. It definitely isn't supposed to be there (such as a warning buzzer). The device communicates its state primarily through a small number-outline display, and it also produces electronic beeping sounds to confirm the press of one of the touch sensors (really, who thought that this was a good interface for anything?! The thing is so unsuited for everyday use, they had to add annoying acoustic feedback because the normal tactile one is missing. But my accidental activation rate is still well above acceptable on all devices using it. [/rant]) and also to catch my attention if needed, such as when the overheating prevention mechanism turns the heat off. No buzzer of any kind is mentioned in the user's manual, and anyway it would be too 20th century to be included in this design.



The buzz isn't constant, it continues several seconds, then stops, then appears again, and so on. Sometimes it is completely missing. It seems to be dependent on the weight of the cookware. Once I cooked with an enamelled dutch oven, and I had no buzz at all. But with all other pieces of cookware I tried, I had the buzz. These include: a cheapish stainless steel pot, I think it has a plain thin stainless steel bottom; a good quality stainless steel pan with copper-sandwich bottom and mineral-based nonstick coating; a plain cast iron pan. I have noticed that the buzz seems to stop when I fill the cookware with enough food, and as the dutch oven weighs more than the other items, I think there might be a weight relation.



3-4 years ago I had access to another portable induction unit, and never heard such a buzz. That one was a vintage model from the mid 1970s. So if the buzz is normal for induction cooking today, why did they drop the non-buzzing technology used in this old piece?



I found an explanation on the Internet which claims that the buzz is caused by microscopic vibration of the layers of a sandwiched bottom. This cannot be the case, as the cast iron pan definitely has no sandwiched bottom, and yet it does generate the buzz.



Does anybody know what causes the buzz? Is it a malfunction of the induction unit, or is it normal to have it? And, because I find it somewhat annoying, do you have any ideas how to prevent it?



EDIT: I don't believe the explanations I have heard till now. "Poor sandwiched construction" is out of question, as it happens with a pan cast as a single piece. "Bottom vibrates against glass" sounds OK at first glance, but I put the pans on a thick fluffy cotton wool pad, and it didn't even reduce the buzz, so it couldn't be the reason. As for the fan - the sound is present before the fan switches on. Still, I am choosing an answer as the accepted one, because it tells me that it isn't a defect in my unit, and this is what I needed to know most.










share|improve this question
























  • This was indirectly referenced in an answer on gas ranges vs induction ranges with some notes on which pans worked best: cooking.stackexchange.com/questions/5124/induction-range-vs-gas/…

    – Ryan Elkins
    Mar 1 '11 at 18:02











  • I usually do not hear it on any cast iron, but sometimes I do when its on max power setting. I don't think its weight nor rattling lids because I have a large thick stainless steel pressure cooker that i use for boiling water, soup, etc. without the lid. This makes the noise horrendously despite being quite thick and heavy. Also my carbon steel (not stainless) wok is very loud, but that's quite thin ~14ga which is .075in or almost 2mm thk. my cast iron dutch oven is silent also.

    – user43155
    Feb 5 '16 at 12:46












  • 60Hz, or do they jazz things up with a dedicated oscillator?

    – Wayfaring Stranger
    Feb 27 at 1:02

















8















I was fed up with the low quality electric hobs which are installed in my 1 meter wide "kitchen" (I forgot a crepe on the smaller one on the highest setting, and 25 min later it wasn't even browned, just dried a bit), so I recently bought a small induction cooking unit. It is a big improvement in terms of cooking convenience.



However, I noticed that with most cookware, it produces a strange buzzing sound. I don't mean the sound of the fan cooling the electronics. It produces a distinct fan-like sound, and I can clearly hear it when it works (it is self-regulated and doesn't blow all the time). But the buzzing occurs independently of the fan. It sounds like an old-fashioned phone, but not as loud and a bit muffled, as if the phone were under a duvet two rooms away. It definitely isn't supposed to be there (such as a warning buzzer). The device communicates its state primarily through a small number-outline display, and it also produces electronic beeping sounds to confirm the press of one of the touch sensors (really, who thought that this was a good interface for anything?! The thing is so unsuited for everyday use, they had to add annoying acoustic feedback because the normal tactile one is missing. But my accidental activation rate is still well above acceptable on all devices using it. [/rant]) and also to catch my attention if needed, such as when the overheating prevention mechanism turns the heat off. No buzzer of any kind is mentioned in the user's manual, and anyway it would be too 20th century to be included in this design.



The buzz isn't constant, it continues several seconds, then stops, then appears again, and so on. Sometimes it is completely missing. It seems to be dependent on the weight of the cookware. Once I cooked with an enamelled dutch oven, and I had no buzz at all. But with all other pieces of cookware I tried, I had the buzz. These include: a cheapish stainless steel pot, I think it has a plain thin stainless steel bottom; a good quality stainless steel pan with copper-sandwich bottom and mineral-based nonstick coating; a plain cast iron pan. I have noticed that the buzz seems to stop when I fill the cookware with enough food, and as the dutch oven weighs more than the other items, I think there might be a weight relation.



3-4 years ago I had access to another portable induction unit, and never heard such a buzz. That one was a vintage model from the mid 1970s. So if the buzz is normal for induction cooking today, why did they drop the non-buzzing technology used in this old piece?



I found an explanation on the Internet which claims that the buzz is caused by microscopic vibration of the layers of a sandwiched bottom. This cannot be the case, as the cast iron pan definitely has no sandwiched bottom, and yet it does generate the buzz.



Does anybody know what causes the buzz? Is it a malfunction of the induction unit, or is it normal to have it? And, because I find it somewhat annoying, do you have any ideas how to prevent it?



EDIT: I don't believe the explanations I have heard till now. "Poor sandwiched construction" is out of question, as it happens with a pan cast as a single piece. "Bottom vibrates against glass" sounds OK at first glance, but I put the pans on a thick fluffy cotton wool pad, and it didn't even reduce the buzz, so it couldn't be the reason. As for the fan - the sound is present before the fan switches on. Still, I am choosing an answer as the accepted one, because it tells me that it isn't a defect in my unit, and this is what I needed to know most.










share|improve this question
























  • This was indirectly referenced in an answer on gas ranges vs induction ranges with some notes on which pans worked best: cooking.stackexchange.com/questions/5124/induction-range-vs-gas/…

    – Ryan Elkins
    Mar 1 '11 at 18:02











  • I usually do not hear it on any cast iron, but sometimes I do when its on max power setting. I don't think its weight nor rattling lids because I have a large thick stainless steel pressure cooker that i use for boiling water, soup, etc. without the lid. This makes the noise horrendously despite being quite thick and heavy. Also my carbon steel (not stainless) wok is very loud, but that's quite thin ~14ga which is .075in or almost 2mm thk. my cast iron dutch oven is silent also.

    – user43155
    Feb 5 '16 at 12:46












  • 60Hz, or do they jazz things up with a dedicated oscillator?

    – Wayfaring Stranger
    Feb 27 at 1:02













8












8








8


1






I was fed up with the low quality electric hobs which are installed in my 1 meter wide "kitchen" (I forgot a crepe on the smaller one on the highest setting, and 25 min later it wasn't even browned, just dried a bit), so I recently bought a small induction cooking unit. It is a big improvement in terms of cooking convenience.



However, I noticed that with most cookware, it produces a strange buzzing sound. I don't mean the sound of the fan cooling the electronics. It produces a distinct fan-like sound, and I can clearly hear it when it works (it is self-regulated and doesn't blow all the time). But the buzzing occurs independently of the fan. It sounds like an old-fashioned phone, but not as loud and a bit muffled, as if the phone were under a duvet two rooms away. It definitely isn't supposed to be there (such as a warning buzzer). The device communicates its state primarily through a small number-outline display, and it also produces electronic beeping sounds to confirm the press of one of the touch sensors (really, who thought that this was a good interface for anything?! The thing is so unsuited for everyday use, they had to add annoying acoustic feedback because the normal tactile one is missing. But my accidental activation rate is still well above acceptable on all devices using it. [/rant]) and also to catch my attention if needed, such as when the overheating prevention mechanism turns the heat off. No buzzer of any kind is mentioned in the user's manual, and anyway it would be too 20th century to be included in this design.



The buzz isn't constant, it continues several seconds, then stops, then appears again, and so on. Sometimes it is completely missing. It seems to be dependent on the weight of the cookware. Once I cooked with an enamelled dutch oven, and I had no buzz at all. But with all other pieces of cookware I tried, I had the buzz. These include: a cheapish stainless steel pot, I think it has a plain thin stainless steel bottom; a good quality stainless steel pan with copper-sandwich bottom and mineral-based nonstick coating; a plain cast iron pan. I have noticed that the buzz seems to stop when I fill the cookware with enough food, and as the dutch oven weighs more than the other items, I think there might be a weight relation.



3-4 years ago I had access to another portable induction unit, and never heard such a buzz. That one was a vintage model from the mid 1970s. So if the buzz is normal for induction cooking today, why did they drop the non-buzzing technology used in this old piece?



I found an explanation on the Internet which claims that the buzz is caused by microscopic vibration of the layers of a sandwiched bottom. This cannot be the case, as the cast iron pan definitely has no sandwiched bottom, and yet it does generate the buzz.



Does anybody know what causes the buzz? Is it a malfunction of the induction unit, or is it normal to have it? And, because I find it somewhat annoying, do you have any ideas how to prevent it?



EDIT: I don't believe the explanations I have heard till now. "Poor sandwiched construction" is out of question, as it happens with a pan cast as a single piece. "Bottom vibrates against glass" sounds OK at first glance, but I put the pans on a thick fluffy cotton wool pad, and it didn't even reduce the buzz, so it couldn't be the reason. As for the fan - the sound is present before the fan switches on. Still, I am choosing an answer as the accepted one, because it tells me that it isn't a defect in my unit, and this is what I needed to know most.










share|improve this question
















I was fed up with the low quality electric hobs which are installed in my 1 meter wide "kitchen" (I forgot a crepe on the smaller one on the highest setting, and 25 min later it wasn't even browned, just dried a bit), so I recently bought a small induction cooking unit. It is a big improvement in terms of cooking convenience.



However, I noticed that with most cookware, it produces a strange buzzing sound. I don't mean the sound of the fan cooling the electronics. It produces a distinct fan-like sound, and I can clearly hear it when it works (it is self-regulated and doesn't blow all the time). But the buzzing occurs independently of the fan. It sounds like an old-fashioned phone, but not as loud and a bit muffled, as if the phone were under a duvet two rooms away. It definitely isn't supposed to be there (such as a warning buzzer). The device communicates its state primarily through a small number-outline display, and it also produces electronic beeping sounds to confirm the press of one of the touch sensors (really, who thought that this was a good interface for anything?! The thing is so unsuited for everyday use, they had to add annoying acoustic feedback because the normal tactile one is missing. But my accidental activation rate is still well above acceptable on all devices using it. [/rant]) and also to catch my attention if needed, such as when the overheating prevention mechanism turns the heat off. No buzzer of any kind is mentioned in the user's manual, and anyway it would be too 20th century to be included in this design.



The buzz isn't constant, it continues several seconds, then stops, then appears again, and so on. Sometimes it is completely missing. It seems to be dependent on the weight of the cookware. Once I cooked with an enamelled dutch oven, and I had no buzz at all. But with all other pieces of cookware I tried, I had the buzz. These include: a cheapish stainless steel pot, I think it has a plain thin stainless steel bottom; a good quality stainless steel pan with copper-sandwich bottom and mineral-based nonstick coating; a plain cast iron pan. I have noticed that the buzz seems to stop when I fill the cookware with enough food, and as the dutch oven weighs more than the other items, I think there might be a weight relation.



3-4 years ago I had access to another portable induction unit, and never heard such a buzz. That one was a vintage model from the mid 1970s. So if the buzz is normal for induction cooking today, why did they drop the non-buzzing technology used in this old piece?



I found an explanation on the Internet which claims that the buzz is caused by microscopic vibration of the layers of a sandwiched bottom. This cannot be the case, as the cast iron pan definitely has no sandwiched bottom, and yet it does generate the buzz.



Does anybody know what causes the buzz? Is it a malfunction of the induction unit, or is it normal to have it? And, because I find it somewhat annoying, do you have any ideas how to prevent it?



EDIT: I don't believe the explanations I have heard till now. "Poor sandwiched construction" is out of question, as it happens with a pan cast as a single piece. "Bottom vibrates against glass" sounds OK at first glance, but I put the pans on a thick fluffy cotton wool pad, and it didn't even reduce the buzz, so it couldn't be the reason. As for the fan - the sound is present before the fan switches on. Still, I am choosing an answer as the accepted one, because it tells me that it isn't a defect in my unit, and this is what I needed to know most.







equipment induction






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Mar 4 '11 at 14:46







rumtscho

















asked Mar 1 '11 at 14:16









rumtschorumtscho

82.8k28191358




82.8k28191358












  • This was indirectly referenced in an answer on gas ranges vs induction ranges with some notes on which pans worked best: cooking.stackexchange.com/questions/5124/induction-range-vs-gas/…

    – Ryan Elkins
    Mar 1 '11 at 18:02











  • I usually do not hear it on any cast iron, but sometimes I do when its on max power setting. I don't think its weight nor rattling lids because I have a large thick stainless steel pressure cooker that i use for boiling water, soup, etc. without the lid. This makes the noise horrendously despite being quite thick and heavy. Also my carbon steel (not stainless) wok is very loud, but that's quite thin ~14ga which is .075in or almost 2mm thk. my cast iron dutch oven is silent also.

    – user43155
    Feb 5 '16 at 12:46












  • 60Hz, or do they jazz things up with a dedicated oscillator?

    – Wayfaring Stranger
    Feb 27 at 1:02

















  • This was indirectly referenced in an answer on gas ranges vs induction ranges with some notes on which pans worked best: cooking.stackexchange.com/questions/5124/induction-range-vs-gas/…

    – Ryan Elkins
    Mar 1 '11 at 18:02











  • I usually do not hear it on any cast iron, but sometimes I do when its on max power setting. I don't think its weight nor rattling lids because I have a large thick stainless steel pressure cooker that i use for boiling water, soup, etc. without the lid. This makes the noise horrendously despite being quite thick and heavy. Also my carbon steel (not stainless) wok is very loud, but that's quite thin ~14ga which is .075in or almost 2mm thk. my cast iron dutch oven is silent also.

    – user43155
    Feb 5 '16 at 12:46












  • 60Hz, or do they jazz things up with a dedicated oscillator?

    – Wayfaring Stranger
    Feb 27 at 1:02
















This was indirectly referenced in an answer on gas ranges vs induction ranges with some notes on which pans worked best: cooking.stackexchange.com/questions/5124/induction-range-vs-gas/…

– Ryan Elkins
Mar 1 '11 at 18:02





This was indirectly referenced in an answer on gas ranges vs induction ranges with some notes on which pans worked best: cooking.stackexchange.com/questions/5124/induction-range-vs-gas/…

– Ryan Elkins
Mar 1 '11 at 18:02













I usually do not hear it on any cast iron, but sometimes I do when its on max power setting. I don't think its weight nor rattling lids because I have a large thick stainless steel pressure cooker that i use for boiling water, soup, etc. without the lid. This makes the noise horrendously despite being quite thick and heavy. Also my carbon steel (not stainless) wok is very loud, but that's quite thin ~14ga which is .075in or almost 2mm thk. my cast iron dutch oven is silent also.

– user43155
Feb 5 '16 at 12:46






I usually do not hear it on any cast iron, but sometimes I do when its on max power setting. I don't think its weight nor rattling lids because I have a large thick stainless steel pressure cooker that i use for boiling water, soup, etc. without the lid. This makes the noise horrendously despite being quite thick and heavy. Also my carbon steel (not stainless) wok is very loud, but that's quite thin ~14ga which is .075in or almost 2mm thk. my cast iron dutch oven is silent also.

– user43155
Feb 5 '16 at 12:46














60Hz, or do they jazz things up with a dedicated oscillator?

– Wayfaring Stranger
Feb 27 at 1:02





60Hz, or do they jazz things up with a dedicated oscillator?

– Wayfaring Stranger
Feb 27 at 1:02










5 Answers
5






active

oldest

votes


















11














As you probably know, induction burners produce an alternating magnetic field that induces a current in the cookware. This process can produce attractive and repulsive forces as well that cause vibrations.



The problem can be caused not only by poor sandwiched construction but by an uneven bottom surface, or loose parts or lids.



I have read that some people have successfully used silicon baking pads to dampen the sound.



This page has some useful information on the subject:



http://theinductionsite.com/proandcon.shtml






share|improve this answer




















  • 1





    +1. I have the same "issue" with my induction unit and indeed, it depends with cookware I use. Some buzzes, some doesn't.

    – Izzydorio
    Mar 1 '11 at 15:37






  • 1





    +1. Same thing happens from time to time with the unit(s) I use at work. I'd go slightly further, and suggest that it may (depending on your unit) be the fan being thrown slightly off-kilter by the magnetic field and/or uneven weight distribution (some trial and error at work has led me to this belief, which may be as valid as believing that the magic ponies inside the unit are just getting tired.)

    – daniel
    Mar 1 '11 at 23:05











  • @daniel- If I ever start an electronics company it will be named Magic Pony Electronics. (NASDAQ: MPE)

    – Sobachatina
    Mar 2 '11 at 15:53


















6














The phenomenon is called magnetostriction, and occurs when the oscillating magnetic field causes the cookware to change shape rapidly.



This frequency will be twice that of the electromagnetic field of the cooker, which is typically over 20kHz, which means that the base frequency of the vibrations is well into the inaudible range of the spectrum.



However, it's possible that the filters for the power of the unit isn't very well regulated, and you may well get some 50/60 Hz (depending on your mains frequency) signal modulating the HF signal. This would then show up as 100/120Hz noise, which is clearly audible.






share|improve this answer

























  • I agree the sound is above 20kHz. I can hear up to 22-24kHz and my max burton countertop induction cooker has the same issues.

    – user43155
    Feb 5 '16 at 12:46



















4














For the most part and not denigrating anybody else's very valid opinions, I can definitely say that in my case the "noises" were caused by the fans getting slightly out of balance from collected grease etc. A good service and re- positioning of the fans on their axles always clears my noise problems. Do not forget that there are normally at least two fans, one for the induction coils and another smaller fan for the "electronics".






share|improve this answer
































    0














    The hum may also be due to a faulty transformer, rectifier, or inverter. An induction cooktop requires a high-frequency alternating current to heat up the pan, and to stop the magnetic forces shifting the pan around the cooktop. This frequency is also high enough so it can't be heard, but will need to transform the energy coming out of the power socket in order to produce this high frequency. This energy is transformed using a transformer rectifier, and an inverter. If these are faulty, the frequency won't be as high, and therefore can be heard. Maybe this is what you're hearing.






    share|improve this answer








    New contributor




    Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      -1














      My cook top in brand new and came supplied with saucepans and frying pan, no buzzing, but bought a new wok, which has the buzz its to do with the pots you are using. Smith and Noble is the brand that came with the cooktop.






      share|improve this answer























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        5 Answers
        5






        active

        oldest

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        5 Answers
        5






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        11














        As you probably know, induction burners produce an alternating magnetic field that induces a current in the cookware. This process can produce attractive and repulsive forces as well that cause vibrations.



        The problem can be caused not only by poor sandwiched construction but by an uneven bottom surface, or loose parts or lids.



        I have read that some people have successfully used silicon baking pads to dampen the sound.



        This page has some useful information on the subject:



        http://theinductionsite.com/proandcon.shtml






        share|improve this answer




















        • 1





          +1. I have the same "issue" with my induction unit and indeed, it depends with cookware I use. Some buzzes, some doesn't.

          – Izzydorio
          Mar 1 '11 at 15:37






        • 1





          +1. Same thing happens from time to time with the unit(s) I use at work. I'd go slightly further, and suggest that it may (depending on your unit) be the fan being thrown slightly off-kilter by the magnetic field and/or uneven weight distribution (some trial and error at work has led me to this belief, which may be as valid as believing that the magic ponies inside the unit are just getting tired.)

          – daniel
          Mar 1 '11 at 23:05











        • @daniel- If I ever start an electronics company it will be named Magic Pony Electronics. (NASDAQ: MPE)

          – Sobachatina
          Mar 2 '11 at 15:53















        11














        As you probably know, induction burners produce an alternating magnetic field that induces a current in the cookware. This process can produce attractive and repulsive forces as well that cause vibrations.



        The problem can be caused not only by poor sandwiched construction but by an uneven bottom surface, or loose parts or lids.



        I have read that some people have successfully used silicon baking pads to dampen the sound.



        This page has some useful information on the subject:



        http://theinductionsite.com/proandcon.shtml






        share|improve this answer




















        • 1





          +1. I have the same "issue" with my induction unit and indeed, it depends with cookware I use. Some buzzes, some doesn't.

          – Izzydorio
          Mar 1 '11 at 15:37






        • 1





          +1. Same thing happens from time to time with the unit(s) I use at work. I'd go slightly further, and suggest that it may (depending on your unit) be the fan being thrown slightly off-kilter by the magnetic field and/or uneven weight distribution (some trial and error at work has led me to this belief, which may be as valid as believing that the magic ponies inside the unit are just getting tired.)

          – daniel
          Mar 1 '11 at 23:05











        • @daniel- If I ever start an electronics company it will be named Magic Pony Electronics. (NASDAQ: MPE)

          – Sobachatina
          Mar 2 '11 at 15:53













        11












        11








        11







        As you probably know, induction burners produce an alternating magnetic field that induces a current in the cookware. This process can produce attractive and repulsive forces as well that cause vibrations.



        The problem can be caused not only by poor sandwiched construction but by an uneven bottom surface, or loose parts or lids.



        I have read that some people have successfully used silicon baking pads to dampen the sound.



        This page has some useful information on the subject:



        http://theinductionsite.com/proandcon.shtml






        share|improve this answer















        As you probably know, induction burners produce an alternating magnetic field that induces a current in the cookware. This process can produce attractive and repulsive forces as well that cause vibrations.



        The problem can be caused not only by poor sandwiched construction but by an uneven bottom surface, or loose parts or lids.



        I have read that some people have successfully used silicon baking pads to dampen the sound.



        This page has some useful information on the subject:



        http://theinductionsite.com/proandcon.shtml







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Mar 1 '11 at 15:13

























        answered Mar 1 '11 at 14:55









        SobachatinaSobachatina

        38.9k15126223




        38.9k15126223







        • 1





          +1. I have the same "issue" with my induction unit and indeed, it depends with cookware I use. Some buzzes, some doesn't.

          – Izzydorio
          Mar 1 '11 at 15:37






        • 1





          +1. Same thing happens from time to time with the unit(s) I use at work. I'd go slightly further, and suggest that it may (depending on your unit) be the fan being thrown slightly off-kilter by the magnetic field and/or uneven weight distribution (some trial and error at work has led me to this belief, which may be as valid as believing that the magic ponies inside the unit are just getting tired.)

          – daniel
          Mar 1 '11 at 23:05











        • @daniel- If I ever start an electronics company it will be named Magic Pony Electronics. (NASDAQ: MPE)

          – Sobachatina
          Mar 2 '11 at 15:53












        • 1





          +1. I have the same "issue" with my induction unit and indeed, it depends with cookware I use. Some buzzes, some doesn't.

          – Izzydorio
          Mar 1 '11 at 15:37






        • 1





          +1. Same thing happens from time to time with the unit(s) I use at work. I'd go slightly further, and suggest that it may (depending on your unit) be the fan being thrown slightly off-kilter by the magnetic field and/or uneven weight distribution (some trial and error at work has led me to this belief, which may be as valid as believing that the magic ponies inside the unit are just getting tired.)

          – daniel
          Mar 1 '11 at 23:05











        • @daniel- If I ever start an electronics company it will be named Magic Pony Electronics. (NASDAQ: MPE)

          – Sobachatina
          Mar 2 '11 at 15:53







        1




        1





        +1. I have the same "issue" with my induction unit and indeed, it depends with cookware I use. Some buzzes, some doesn't.

        – Izzydorio
        Mar 1 '11 at 15:37





        +1. I have the same "issue" with my induction unit and indeed, it depends with cookware I use. Some buzzes, some doesn't.

        – Izzydorio
        Mar 1 '11 at 15:37




        1




        1





        +1. Same thing happens from time to time with the unit(s) I use at work. I'd go slightly further, and suggest that it may (depending on your unit) be the fan being thrown slightly off-kilter by the magnetic field and/or uneven weight distribution (some trial and error at work has led me to this belief, which may be as valid as believing that the magic ponies inside the unit are just getting tired.)

        – daniel
        Mar 1 '11 at 23:05





        +1. Same thing happens from time to time with the unit(s) I use at work. I'd go slightly further, and suggest that it may (depending on your unit) be the fan being thrown slightly off-kilter by the magnetic field and/or uneven weight distribution (some trial and error at work has led me to this belief, which may be as valid as believing that the magic ponies inside the unit are just getting tired.)

        – daniel
        Mar 1 '11 at 23:05













        @daniel- If I ever start an electronics company it will be named Magic Pony Electronics. (NASDAQ: MPE)

        – Sobachatina
        Mar 2 '11 at 15:53





        @daniel- If I ever start an electronics company it will be named Magic Pony Electronics. (NASDAQ: MPE)

        – Sobachatina
        Mar 2 '11 at 15:53













        6














        The phenomenon is called magnetostriction, and occurs when the oscillating magnetic field causes the cookware to change shape rapidly.



        This frequency will be twice that of the electromagnetic field of the cooker, which is typically over 20kHz, which means that the base frequency of the vibrations is well into the inaudible range of the spectrum.



        However, it's possible that the filters for the power of the unit isn't very well regulated, and you may well get some 50/60 Hz (depending on your mains frequency) signal modulating the HF signal. This would then show up as 100/120Hz noise, which is clearly audible.






        share|improve this answer

























        • I agree the sound is above 20kHz. I can hear up to 22-24kHz and my max burton countertop induction cooker has the same issues.

          – user43155
          Feb 5 '16 at 12:46
















        6














        The phenomenon is called magnetostriction, and occurs when the oscillating magnetic field causes the cookware to change shape rapidly.



        This frequency will be twice that of the electromagnetic field of the cooker, which is typically over 20kHz, which means that the base frequency of the vibrations is well into the inaudible range of the spectrum.



        However, it's possible that the filters for the power of the unit isn't very well regulated, and you may well get some 50/60 Hz (depending on your mains frequency) signal modulating the HF signal. This would then show up as 100/120Hz noise, which is clearly audible.






        share|improve this answer

























        • I agree the sound is above 20kHz. I can hear up to 22-24kHz and my max burton countertop induction cooker has the same issues.

          – user43155
          Feb 5 '16 at 12:46














        6












        6








        6







        The phenomenon is called magnetostriction, and occurs when the oscillating magnetic field causes the cookware to change shape rapidly.



        This frequency will be twice that of the electromagnetic field of the cooker, which is typically over 20kHz, which means that the base frequency of the vibrations is well into the inaudible range of the spectrum.



        However, it's possible that the filters for the power of the unit isn't very well regulated, and you may well get some 50/60 Hz (depending on your mains frequency) signal modulating the HF signal. This would then show up as 100/120Hz noise, which is clearly audible.






        share|improve this answer















        The phenomenon is called magnetostriction, and occurs when the oscillating magnetic field causes the cookware to change shape rapidly.



        This frequency will be twice that of the electromagnetic field of the cooker, which is typically over 20kHz, which means that the base frequency of the vibrations is well into the inaudible range of the spectrum.



        However, it's possible that the filters for the power of the unit isn't very well regulated, and you may well get some 50/60 Hz (depending on your mains frequency) signal modulating the HF signal. This would then show up as 100/120Hz noise, which is clearly audible.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Jun 16 '14 at 15:28

























        answered Jun 16 '14 at 11:15









        PopupPopup

        806612




        806612












        • I agree the sound is above 20kHz. I can hear up to 22-24kHz and my max burton countertop induction cooker has the same issues.

          – user43155
          Feb 5 '16 at 12:46


















        • I agree the sound is above 20kHz. I can hear up to 22-24kHz and my max burton countertop induction cooker has the same issues.

          – user43155
          Feb 5 '16 at 12:46

















        I agree the sound is above 20kHz. I can hear up to 22-24kHz and my max burton countertop induction cooker has the same issues.

        – user43155
        Feb 5 '16 at 12:46






        I agree the sound is above 20kHz. I can hear up to 22-24kHz and my max burton countertop induction cooker has the same issues.

        – user43155
        Feb 5 '16 at 12:46












        4














        For the most part and not denigrating anybody else's very valid opinions, I can definitely say that in my case the "noises" were caused by the fans getting slightly out of balance from collected grease etc. A good service and re- positioning of the fans on their axles always clears my noise problems. Do not forget that there are normally at least two fans, one for the induction coils and another smaller fan for the "electronics".






        share|improve this answer





























          4














          For the most part and not denigrating anybody else's very valid opinions, I can definitely say that in my case the "noises" were caused by the fans getting slightly out of balance from collected grease etc. A good service and re- positioning of the fans on their axles always clears my noise problems. Do not forget that there are normally at least two fans, one for the induction coils and another smaller fan for the "electronics".






          share|improve this answer



























            4












            4








            4







            For the most part and not denigrating anybody else's very valid opinions, I can definitely say that in my case the "noises" were caused by the fans getting slightly out of balance from collected grease etc. A good service and re- positioning of the fans on their axles always clears my noise problems. Do not forget that there are normally at least two fans, one for the induction coils and another smaller fan for the "electronics".






            share|improve this answer















            For the most part and not denigrating anybody else's very valid opinions, I can definitely say that in my case the "noises" were caused by the fans getting slightly out of balance from collected grease etc. A good service and re- positioning of the fans on their axles always clears my noise problems. Do not forget that there are normally at least two fans, one for the induction coils and another smaller fan for the "electronics".







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Mar 6 '15 at 11:11









            Ching Chong

            4,19232145




            4,19232145










            answered Jun 16 '14 at 7:57









            AxcorAxcor

            411




            411





















                0














                The hum may also be due to a faulty transformer, rectifier, or inverter. An induction cooktop requires a high-frequency alternating current to heat up the pan, and to stop the magnetic forces shifting the pan around the cooktop. This frequency is also high enough so it can't be heard, but will need to transform the energy coming out of the power socket in order to produce this high frequency. This energy is transformed using a transformer rectifier, and an inverter. If these are faulty, the frequency won't be as high, and therefore can be heard. Maybe this is what you're hearing.






                share|improve this answer








                New contributor




                Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                Check out our Code of Conduct.
























                  0














                  The hum may also be due to a faulty transformer, rectifier, or inverter. An induction cooktop requires a high-frequency alternating current to heat up the pan, and to stop the magnetic forces shifting the pan around the cooktop. This frequency is also high enough so it can't be heard, but will need to transform the energy coming out of the power socket in order to produce this high frequency. This energy is transformed using a transformer rectifier, and an inverter. If these are faulty, the frequency won't be as high, and therefore can be heard. Maybe this is what you're hearing.






                  share|improve this answer








                  New contributor




                  Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.






















                    0












                    0








                    0







                    The hum may also be due to a faulty transformer, rectifier, or inverter. An induction cooktop requires a high-frequency alternating current to heat up the pan, and to stop the magnetic forces shifting the pan around the cooktop. This frequency is also high enough so it can't be heard, but will need to transform the energy coming out of the power socket in order to produce this high frequency. This energy is transformed using a transformer rectifier, and an inverter. If these are faulty, the frequency won't be as high, and therefore can be heard. Maybe this is what you're hearing.






                    share|improve this answer








                    New contributor




                    Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.










                    The hum may also be due to a faulty transformer, rectifier, or inverter. An induction cooktop requires a high-frequency alternating current to heat up the pan, and to stop the magnetic forces shifting the pan around the cooktop. This frequency is also high enough so it can't be heard, but will need to transform the energy coming out of the power socket in order to produce this high frequency. This energy is transformed using a transformer rectifier, and an inverter. If these are faulty, the frequency won't be as high, and therefore can be heard. Maybe this is what you're hearing.







                    share|improve this answer








                    New contributor




                    Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.









                    share|improve this answer



                    share|improve this answer






                    New contributor




                    Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.









                    answered 42 mins ago









                    NeveNeve

                    1




                    1




                    New contributor




                    Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.





                    New contributor





                    Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.






                    Neve is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.





















                        -1














                        My cook top in brand new and came supplied with saucepans and frying pan, no buzzing, but bought a new wok, which has the buzz its to do with the pots you are using. Smith and Noble is the brand that came with the cooktop.






                        share|improve this answer



























                          -1














                          My cook top in brand new and came supplied with saucepans and frying pan, no buzzing, but bought a new wok, which has the buzz its to do with the pots you are using. Smith and Noble is the brand that came with the cooktop.






                          share|improve this answer

























                            -1












                            -1








                            -1







                            My cook top in brand new and came supplied with saucepans and frying pan, no buzzing, but bought a new wok, which has the buzz its to do with the pots you are using. Smith and Noble is the brand that came with the cooktop.






                            share|improve this answer













                            My cook top in brand new and came supplied with saucepans and frying pan, no buzzing, but bought a new wok, which has the buzz its to do with the pots you are using. Smith and Noble is the brand that came with the cooktop.







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered Dec 23 '17 at 19:30









                            JillJill

                            1




                            1



























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