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If you have two identical but oppositely wound inductors does the inductance effectively cancel?
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I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking at the change in signs I imagine this to be the case.
Someone mentioned it to me regarding wound resistors in a circuits, and splitting them into 2 resistors in series, with opposite winding to reduce/attempt to cancel the inductance.
I have also recently needed to place several surface mount inductors in series, and I have no way of identifying which end is which, or the winding directions. They are not all the same make or model.And I have had difficulty measuring their inductance.
inductor inductance induction winding
asked 1 hour ago
Dave
306
add a comment |Â
up vote
2
down vote
favorite
I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking at the change in signs I imagine this to be the case.
Someone mentioned it to me regarding wound resistors in a circuits, and splitting them into 2 resistors in series, with opposite winding to reduce/attempt to cancel the inductance.
I have also recently needed to place several surface mount inductors in series, and I have no way of identifying which end is which, or the winding directions. They are not all the same make or model.And I have had difficulty measuring their inductance.
inductor inductance induction winding
asked 1 hour ago
Dave
306
It would depend primarily on how well the two inductors are coupled. A practical application of this is used in wirewound resistors to reduce their parasitic inductance, but in this case the windings are done on one form bifilar or Ayrton-Perry winding topologies are used. They tend to be a niche application because it's expensive to produce than a simple helical coil.
– isdi
1 hour ago
Manufacturers do put polarity marks on inductors for some applications to reduce such mutual coupling effects.
– isdi
1 hour ago
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking at the change in signs I imagine this to be the case.
Someone mentioned it to me regarding wound resistors in a circuits, and splitting them into 2 resistors in series, with opposite winding to reduce/attempt to cancel the inductance.
I have also recently needed to place several surface mount inductors in series, and I have no way of identifying which end is which, or the winding directions. They are not all the same make or model.And I have had difficulty measuring their inductance.
inductor inductance induction winding
asked 1 hour ago
Dave
306
I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking at the change in signs I imagine this to be the case.
Someone mentioned it to me regarding wound resistors in a circuits, and splitting them into 2 resistors in series, with opposite winding to reduce/attempt to cancel the inductance.
I have also recently needed to place several surface mount inductors in series, and I have no way of identifying which end is which, or the winding directions. They are not all the same make or model.And I have had difficulty measuring their inductance.
inductor inductance induction winding
inductor inductance induction winding
asked 1 hour ago
Dave
306
asked 1 hour ago
Dave
306
asked 1 hour ago
Dave
306
asked 1 hour ago
Dave
306
asked 1 hour ago
Dave
306
306
It would depend primarily on how well the two inductors are coupled. A practical application of this is used in wirewound resistors to reduce their parasitic inductance, but in this case the windings are done on one form bifilar or Ayrton-Perry winding topologies are used. They tend to be a niche application because it's expensive to produce than a simple helical coil.
– isdi
1 hour ago
Manufacturers do put polarity marks on inductors for some applications to reduce such mutual coupling effects.
– isdi
1 hour ago
add a comment |Â
It would depend primarily on how well the two inductors are coupled. A practical application of this is used in wirewound resistors to reduce their parasitic inductance, but in this case the windings are done on one form bifilar or Ayrton-Perry winding topologies are used. They tend to be a niche application because it's expensive to produce than a simple helical coil.
– isdi
1 hour ago
Manufacturers do put polarity marks on inductors for some applications to reduce such mutual coupling effects.
– isdi
1 hour ago
It would depend primarily on how well the two inductors are coupled. A practical application of this is used in wirewound resistors to reduce their parasitic inductance, but in this case the windings are done on one form bifilar or Ayrton-Perry winding topologies are used. They tend to be a niche application because it's expensive to produce than a simple helical coil.
– isdi
1 hour ago
It would depend primarily on how well the two inductors are coupled. A practical application of this is used in wirewound resistors to reduce their parasitic inductance, but in this case the windings are done on one form bifilar or Ayrton-Perry winding topologies are used. They tend to be a niche application because it's expensive to produce than a simple helical coil.
– isdi
1 hour ago
Manufacturers do put polarity marks on inductors for some applications to reduce such mutual coupling effects.
– isdi
1 hour ago
Manufacturers do put polarity marks on inductors for some applications to reduce such mutual coupling effects.
– isdi
1 hour ago
add a comment |Â
1 Answer
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up vote
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It depends of the extend of their mutual inductance. Roughtly speaking, if they are wound of the same ferrite core, they have a large proportion of their inductance that is mutual (as in a transformer for instance), so they would mostly cancel. If, as it seems to be your case, they are separate components, they are wound on separate cores and have little mutual inductance.
In case of air inductors or resistors as mentionned, the distance between them and exacte geometry has to be taken into account and only an electromagnetic simulation software can tell how much is canceled, but that would be much less than a complete cancellation.
answered 1 hour ago
jluu
512
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
5
down vote
It depends of the extend of their mutual inductance. Roughtly speaking, if they are wound of the same ferrite core, they have a large proportion of their inductance that is mutual (as in a transformer for instance), so they would mostly cancel. If, as it seems to be your case, they are separate components, they are wound on separate cores and have little mutual inductance.
In case of air inductors or resistors as mentionned, the distance between them and exacte geometry has to be taken into account and only an electromagnetic simulation software can tell how much is canceled, but that would be much less than a complete cancellation.
answered 1 hour ago
jluu
512
add a comment |Â
up vote
5
down vote
It depends of the extend of their mutual inductance. Roughtly speaking, if they are wound of the same ferrite core, they have a large proportion of their inductance that is mutual (as in a transformer for instance), so they would mostly cancel. If, as it seems to be your case, they are separate components, they are wound on separate cores and have little mutual inductance.
In case of air inductors or resistors as mentionned, the distance between them and exacte geometry has to be taken into account and only an electromagnetic simulation software can tell how much is canceled, but that would be much less than a complete cancellation.
answered 1 hour ago
jluu
512
add a comment |Â
up vote
5
down vote
up vote
5
down vote
It depends of the extend of their mutual inductance. Roughtly speaking, if they are wound of the same ferrite core, they have a large proportion of their inductance that is mutual (as in a transformer for instance), so they would mostly cancel. If, as it seems to be your case, they are separate components, they are wound on separate cores and have little mutual inductance.
In case of air inductors or resistors as mentionned, the distance between them and exacte geometry has to be taken into account and only an electromagnetic simulation software can tell how much is canceled, but that would be much less than a complete cancellation.
answered 1 hour ago
jluu
512
It depends of the extend of their mutual inductance. Roughtly speaking, if they are wound of the same ferrite core, they have a large proportion of their inductance that is mutual (as in a transformer for instance), so they would mostly cancel. If, as it seems to be your case, they are separate components, they are wound on separate cores and have little mutual inductance.
In case of air inductors or resistors as mentionned, the distance between them and exacte geometry has to be taken into account and only an electromagnetic simulation software can tell how much is canceled, but that would be much less than a complete cancellation.
answered 1 hour ago
jluu
512
answered 1 hour ago
jluu
512
answered 1 hour ago
jluu
512
answered 1 hour ago
jluu
512
512
add a comment |Â
add a comment |Â
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It would depend primarily on how well the two inductors are coupled. A practical application of this is used in wirewound resistors to reduce their parasitic inductance, but in this case the windings are done on one form bifilar or Ayrton-Perry winding topologies are used. They tend to be a niche application because it's expensive to produce than a simple helical coil.
– isdi
1 hour ago
Manufacturers do put polarity marks on inductors for some applications to reduce such mutual coupling effects.
– isdi
1 hour ago