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Q&A Coupling of inductors

When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well. For this circuit: Now current entering one coil marke...

posted 3y ago by MissMulan‭  ·  edited 3y ago by Elliot Alderson‭

Answer
#4: Post edited by user avatar Elliot Alderson‭ · 2021-09-04T15:40:12Z (about 3 years ago)
Fixed SI unit for henry in text, can't fix it in graphics. Fixed other small errors.
  • When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well.
  • For this circuit:
  • ![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9)
  • Now current entering one coil marked with a dot , produces a current exitting the couple coil at its dotting end.In L1 current enters from the dotted end so this creates a current which exits from the dotted end of L2 and in L2 current enters from the dotted end so this again creates a current which exits from the dotted end of L1 so we get 2 voltage drops from self inductance of each coil and 2 voltage drops from the mutual inductance of the coupled coils.
  • ![I](https://electrical.codidact.com/uploads/9rF1TGmSbyjXheyYbaf81p3z)
  • so that is translated to this equation:
  • ![](https://electrical.codidact.com/uploads/emSsaAC41ngoDAQM1JsoPyNq)
  • Now obviously :
  • ![](https://electrical.codidact.com/uploads/UGnT3PZrtT6aqkMHLrsnwmdq)
  • The total inductance of the circuit becomes ![](https://electrical.codidact.com/uploads/vdsK3wj6wSQYEpeKCPvXCnpv)
  • the value of the mutual inductance is:(with k=1)
  • ![](https://electrical.codidact.com/uploads/X3znhTfjLipcUBHdWcQUfpv4)
  • $L_{T}=4H$
  • and the equation of current of this circuit becomes
  • ![](https://electrical.codidact.com/uploads/6q6XKefrqD8ZUzYHqmJNcKox)
  • When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well.
  • For this circuit:
  • ![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9)
  • Now current entering one coil marked with a dot, produces a current exiting the couple coil at its dotting end. In L1 current enters from the dotted end so this creates a current which exits from the dotted end of L2 and in L2 current enters from the dotted end so this again creates a current which exits from the dotted end of L1 so we get 2 voltage drops from self inductance of each coil and 2 voltage drops from the mutual inductance of the coupled coils.
  • ![I](https://electrical.codidact.com/uploads/9rF1TGmSbyjXheyYbaf81p3z)
  • so that is translated to this equation:
  • ![](https://electrical.codidact.com/uploads/emSsaAC41ngoDAQM1JsoPyNq)
  • Now obviously :
  • ![](https://electrical.codidact.com/uploads/UGnT3PZrtT6aqkMHLrsnwmdq)
  • The total inductance of the circuit becomes ![](https://electrical.codidact.com/uploads/vdsK3wj6wSQYEpeKCPvXCnpv)
  • the value of the mutual inductance is: (with k=1)
  • ![](https://electrical.codidact.com/uploads/X3znhTfjLipcUBHdWcQUfpv4)
  • $L_{T}=4 \text{H}$
  • and the equation of current of this circuit becomes
  • ![](https://electrical.codidact.com/uploads/6q6XKefrqD8ZUzYHqmJNcKox)
#3: Post edited by user avatar MissMulan‭ · 2021-09-03T23:13:28Z (about 3 years ago)
  • When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well.
  • For this circuit:
  • ![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9)
  • Now current entering one coil marked with a dot , produces a current exitting the couple coil at its dotting end.In L1 current enters from the dotted end so this creates a current which exits from the dotted end of L2 and in L2 current enters from the dotted end so this again creates a current which exits from the dotted end of L1 so we get 2 voltage drops from self inductance of each coil and 2 voltage drops from the mutual inductance of the coupled coils.
  • ![I](https://electrical.codidact.com/uploads/9rF1TGmSbyjXheyYbaf81p3z)
  • so that is translated to this equation:
  • ![](https://electrical.codidact.com/uploads/emSsaAC41ngoDAQM1JsoPyNq)
  • Now obviously :
  • ![](https://electrical.codidact.com/uploads/UGnT3PZrtT6aqkMHLrsnwmdq)
  • so the total inductance of the circuit becomes ![](https://electrical.codidact.com/uploads/vdsK3wj6wSQYEpeKCPvXCnpv)
  • the value of the mutual inductance is:(with k=1)
  • ![](https://electrical.codidact.com/uploads/X3znhTfjLipcUBHdWcQUfpv4)
  • and the equation of current of this circuit becomes
  • ![](https://electrical.codidact.com/uploads/6q6XKefrqD8ZUzYHqmJNcKox)
  • When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well.
  • For this circuit:
  • ![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9)
  • Now current entering one coil marked with a dot , produces a current exitting the couple coil at its dotting end.In L1 current enters from the dotted end so this creates a current which exits from the dotted end of L2 and in L2 current enters from the dotted end so this again creates a current which exits from the dotted end of L1 so we get 2 voltage drops from self inductance of each coil and 2 voltage drops from the mutual inductance of the coupled coils.
  • ![I](https://electrical.codidact.com/uploads/9rF1TGmSbyjXheyYbaf81p3z)
  • so that is translated to this equation:
  • ![](https://electrical.codidact.com/uploads/emSsaAC41ngoDAQM1JsoPyNq)
  • Now obviously :
  • ![](https://electrical.codidact.com/uploads/UGnT3PZrtT6aqkMHLrsnwmdq)
  • The total inductance of the circuit becomes ![](https://electrical.codidact.com/uploads/vdsK3wj6wSQYEpeKCPvXCnpv)
  • the value of the mutual inductance is:(with k=1)
  • ![](https://electrical.codidact.com/uploads/X3znhTfjLipcUBHdWcQUfpv4)
  • $L_{T}=4H$
  • and the equation of current of this circuit becomes
  • ![](https://electrical.codidact.com/uploads/6q6XKefrqD8ZUzYHqmJNcKox)
#2: Post edited by user avatar MissMulan‭ · 2021-09-03T23:11:33Z (about 3 years ago)
  • When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well.
  • For this circuit:
  • ![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9)
  • Now current entering one coil marked with a dot , produces a current exitting the couple coil at its dotting end.In L1 current enters from the dotted end so this creates a current which exits from the dotted end of L2 and in L2 current enters from the dotted end so this again creates a current which exits from the dotted end of L1 so we get 2 voltage drops from self inductance of each coil and 2 voltage drops from the mutual inductance of the coupled coils.
  • ![I](https://electrical.codidact.com/uploads/9rF1TGmSbyjXheyYbaf81p3z)
  • so that is translated to this equation:
  • ![](https://electrical.codidact.com/uploads/emSsaAC41ngoDAQM1JsoPyNq)
  • Now obviously :
  • ![](https://electrical.codidact.com/uploads/UGnT3PZrtT6aqkMHLrsnwmdq)
  • the value of the mutual inductance is:(with k=1)
  • ![](https://electrical.codidact.com/uploads/X3znhTfjLipcUBHdWcQUfpv4)
  • so the total inductance of the circuit becomes ![](https://electrical.codidact.com/uploads/vdsK3wj6wSQYEpeKCPvXCnpv)
  • and the equation of current of this circuit becomes
  • ![](https://electrical.codidact.com/uploads/6q6XKefrqD8ZUzYHqmJNcKox)
  • When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well.
  • For this circuit:
  • ![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9)
  • Now current entering one coil marked with a dot , produces a current exitting the couple coil at its dotting end.In L1 current enters from the dotted end so this creates a current which exits from the dotted end of L2 and in L2 current enters from the dotted end so this again creates a current which exits from the dotted end of L1 so we get 2 voltage drops from self inductance of each coil and 2 voltage drops from the mutual inductance of the coupled coils.
  • ![I](https://electrical.codidact.com/uploads/9rF1TGmSbyjXheyYbaf81p3z)
  • so that is translated to this equation:
  • ![](https://electrical.codidact.com/uploads/emSsaAC41ngoDAQM1JsoPyNq)
  • Now obviously :
  • ![](https://electrical.codidact.com/uploads/UGnT3PZrtT6aqkMHLrsnwmdq)
  • so the total inductance of the circuit becomes ![](https://electrical.codidact.com/uploads/vdsK3wj6wSQYEpeKCPvXCnpv)
  • the value of the mutual inductance is:(with k=1)
  • ![](https://electrical.codidact.com/uploads/X3znhTfjLipcUBHdWcQUfpv4)
  • and the equation of current of this circuit becomes
  • ![](https://electrical.codidact.com/uploads/6q6XKefrqD8ZUzYHqmJNcKox)
#1: Initial revision by user avatar MissMulan‭ · 2021-09-03T21:44:57Z (about 3 years ago)
When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well.
For this circuit:

![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9)




Now current entering one coil marked with a dot , produces a current exitting the couple coil at its dotting end.In L1 current enters from the dotted end so this creates a current which exits from the dotted end of L2 and in L2 current enters from the dotted end so this again creates a current which exits from the dotted end of L1 so we get 2 voltage drops from self inductance of each coil and 2 voltage drops from the mutual inductance of the coupled coils. 

![I](https://electrical.codidact.com/uploads/9rF1TGmSbyjXheyYbaf81p3z)

so that is translated to this equation:

![](https://electrical.codidact.com/uploads/emSsaAC41ngoDAQM1JsoPyNq)

Now obviously :

![](https://electrical.codidact.com/uploads/UGnT3PZrtT6aqkMHLrsnwmdq)

the value of the mutual inductance  is:(with k=1)

![](https://electrical.codidact.com/uploads/X3znhTfjLipcUBHdWcQUfpv4)

so the total inductance of the circuit becomes ![](https://electrical.codidact.com/uploads/vdsK3wj6wSQYEpeKCPvXCnpv)

and the equation of current of this circuit becomes

![](https://electrical.codidact.com/uploads/6q6XKefrqD8ZUzYHqmJNcKox)