Parallel transformers - checking my models

Click For Summary

Discussion Overview

The discussion revolves around modeling a circuit with parallel transformers, specifically focusing on the equations governing the behavior of coupled inductors in a parallel magnetic circuit. Participants are examining the adequacy of the proposed equations and seeking additional insights or equations that may be necessary for a complete model.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant presents a series of equations related to the mutual inductance and flux in a parallel transformer setup, questioning whether additional equations are needed to relate the currents I1 and I2 without derivatives.
  • The participant expresses uncertainty about the completeness of their model and seeks clarification on whether their equations are sufficient for solving the system.
  • Other participants comment on the effort to seek help from a tutor, with one expressing frustration over not receiving a satisfactory answer despite attempts to pay for assistance.

Areas of Agreement / Disagreement

There is no consensus on whether the initial equations provided are sufficient or if additional equations are necessary. The discussion reflects a mix of technical inquiry and frustration over the lack of clear answers from external sources.

Contextual Notes

Participants have not reached a resolution regarding the adequacy of the equations, and there may be missing assumptions or dependencies on specific definitions that have not been fully articulated.

fahraynk
Messages
185
Reaction score
5
upload_2017-1-23_22-39-52.png

So on the left is a circuit which shows a voltage source and 2 coupled inductors in a parallel magnetic circuit shown on the right (transformer with a parallel core).
Can someone tell me if I am modelling it correctly with the following equations?
Rc1,Rc2,Rc3 are the reluctance of each branch of the transformer core
M = mutual inductance between the coils.
φ1 and φ2 are the flux on left loop and right loop of the magnetic circuit.
φ10 and φ20 are the total flux from L1 and L2 alone
$$M=k\sqrt{L1*L2}\\k=\frac{\phi_{12}}{\phi{1_0}}=\frac{\phi_{21}}{\phi{2_0}}$$

Here are the equations I came up with :

$$
MI_2'+L_1I_1'+R_1I_1+V_0cos(wt)=0\\
MI_1'+L_2I_2'+R_2I_2=0\\
\phi_1R_{c1}+R_{c2}(\phi_1-\phi_2)=N1I1\\
\phi_2R_{c3}+R_{c2}(\phi2-\phi1)+N1I1-N2I2=0\\$$
so the total flux through path 2 (φ2)- the total flux produced by the 2nd inductor (φ20)= φ12

$$L_2I_2=N2\phi2_0\\k=\frac{\phi_{12}}{\phi1_0} \hspace{10 mm}\phi_{12}=\phi_2-L_2\frac{I_2}{N2}\\
k=\frac{(N2\phi_2-L_2I_2)N1}{N2L_1I_1}$$

Is this enough equations to solve... or am I missing an equation? If so... what equation am I missing? I think there needs to be something relating I2 to I1 without the derivatives... ?
 

Attachments

  • upload_2017-1-23_22-35-38.png
    upload_2017-1-23_22-35-38.png
    2.6 KB · Views: 586
Engineering news on Phys.org
Tried to pay a tutor to answer but they said I don't have to pay because their answer might be wrong -_-
 
This man isn't serious, he got his answer, never tried to pay the tutor...
 
valentin bogatu said:
This man isn't serious, he got his answer, never tried to pay the tutor...
I tried to pay for an answer, meaning If I got an answer for the current I1, I2. But after like 48 hours I went through like 5 people and did not get the answer? I pretty much got my own work shown back to me with no current.
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 16 ·
Replies
16
Views
5K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 359 ·
12
Replies
359
Views
33K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 108 ·
4
Replies
108
Views
36K
  • · Replies 47 ·
2
Replies
47
Views
7K
  • · Replies 1 ·
Replies
1
Views
7K
  • · Replies 18 ·
Replies
18
Views
7K