Magnetic Circuits - Mutual Inductance & Self Inductance

[@swathi9086]

Thank you so much for this explanation sir..i am searching all over internet about clarification for mutual inductance and magnetizing inductance in transformer... You cleared my doubts sir... Thank you so much..please continue to upload vedios ,they are really helpful

[@EnergyConversionAcademy]

You are very welcome. Thanks for your nice comment. Sure I will continue the lectures...

[@Vahe.Caliskan]

In the magnetic circuits shown, the source N1i1 and N2i2 are "voltage" sources but are drawn using "current" source symbols. I understand the meaning (the + side of the "voltage" source would be where the arrow is pointing) but it may be confusing to some as this is not the standard notation in most circuits textbooks. Note for example that the phi_1 would be the "current" leaving the + side of the N1i1 "voltage" source.

[@EnergyConversionAcademy]

Thank you for your comment. I agree. The representation I used is not accurate. I should have taken the arrow out of the source and add polarity signs.

[@Vahe.Caliskan]

@@EnergyConversionAcademy No problem ... it was not a complaint. I think the material and the presentation are very clear and has all the details.

[@scarpredator5583]

the example in 03:43 and the second last example is exactly the same. no one understand why suddenly change to negative sign lol

[@EnergyConversionAcademy]

The difference between the two examples is that in example (time 3:43) the two magnetic fields of the two coils are in the same direction (supporting each others) while in second example the two magnetic fields are opposing each others (Refer to time 12:26 as I mentioned the difference). Please apply the Right Hand Rule to confirm the direction of the magnetic fields for the two examples. Thanks for your question

[@scarpredator5583]

@@EnergyConversionAcademysry my fault. At that moment I didn't notice the direction of the I2 has changed in opposite one. I look the video once more and discover that. Thxxxxxxx bro

[@scarpredator5583]

@@EnergyConversionAcademy btw ur all videos I watch them and thk are very good

[@insoleafptyptd3801]

As noted the equations are correct as per the responses to this thread. The simpler observation is that although the current for i2 in both instances was drawn inward the subtle difference is the winding directions were opposite for coil 2 in the two examples. In the first example i2 was drawn to flow in the coil in front and around the magnetic core indicating a clockwise winding direction. In the second example the winding was behind and around indicating a counter clockwise winding direction. When this is considered and the right hand rule is applied the equations come out correctly and account for the sign difference in the equations. This topic was significantly more detailed than previous video's and a lot to take in. The derivation of the magnetic to electric circuit equivalence was well developed but would benefit from a little more description on the symbols and their meaning.