B LC resonance with high Q factor, Inductor with non magnetic core

  • B
  • Thread starter Thread starter StoyanNikolov
  • Start date Start date
  • Tags Tags
    Inductor
AI Thread Summary
The discussion centers on the feasibility of achieving high Q factor LC resonance using an inductor with a non-magnetic solid metal core and an air gap. It is concluded that significant eddy currents in the core will lead to heating, which prevents attaining a high Q factor, typically defined as above 20. While an LC tank circuit can oscillate at its resonant frequency, energy losses due to eddy currents must be compensated by the active oscillator. The dimensions of the coil and core, as well as specific capacitance and frequency values, are crucial for resonance design. Ultimately, achieving a high Q factor in this setup is highly challenging due to inherent losses.
StoyanNikolov
Messages
50
Reaction score
0
TL;DR Summary
Lc resonance with high Q factor. Inductor with non magnetic core and air gap
Consider Inductor with air gap and solid metal core made from material with relative magnetic permeability 1 regardless of temperature (such as copper or aluminium).
There is Air gap between coil and metal core

IMG-46115e6ae36f891ba72366ded3739868-V.jpg
Please Also consider Eddy currents in the solid metal core.
The Inductor is connected with capacitor in

Series LC circuit

Parallel LC circuit

Is it possible under certain values of frequency and capacitance to obtain lc resonance with high q factor?
 
Physics news on Phys.org
StoyanNikolov said:
TL;DR Summary: Lc resonance with high Q factor. Inductor with non magnetic core and air gap

Is it possible under certain values of frequency and capacitance to obtain lc resonance with high q factor?
No. The eddy current heating of the core will be significant, and so will preclude a high Q. But then your definition of high Q may be different from mine.

An LC tank circuit could be driven to oscillate at its resonant frequency, but the active oscillator element would need to make up the energy lost to the eddy currents in the core.
 
Baluncore said:
No. The eddy current heating of the core will be significant, and so will preclude a high Q. But then your definition of high Q may be different from mine.

An LC tank circuit could be driven to oscillate at its resonant frequency, but the active oscillator element would need to make up the energy lost to the eddy currents in the core.
Let's say Is it possible with certain values of Capacitance and Frequency to obtain Resonance with Q above 20 for the given LC Circuit?
 
StoyanNikolov said:
Let's say Is it possible with certain values of Capacitance and Frequency to obtain Resonance with Q above 20 for the given LC Circuit?
Why would you say that?
You could design it to have a Q of 20.
What are the dimensions of the coil and the core?
Why is Q relevant?
 
Baluncore said:
Why would you say that?
You could design it to have a Q of 20.
What are the dimensions of the coil and the core?
Why is Q relevant?
With current Inductor with Solid Metal Core and the Eddy currents. Is it possible to have Q above 20. Inductor(with solid metal core) , Values of Capacitance of the Capacitor (Switched in Parallel or in Series) and input Frequency
 
Last edited:

Thread 'Maxwell stress tensor'

This is from Griffiths' Electrodynamics, 3rd edition, page 352. I am trying to calculate the divergence of the Maxwell stress tensor. The tensor is given as ##T_{ij} =\epsilon_0 (E_iE_j-\frac 1 2 \delta_{ij} E^2)+\frac 1 {\mu_0}(B_iB_j-\frac 1 2 \delta_{ij} B^2)##. To make things easier, I just want to focus on the part with the electrical field, i.e. I want to find the divergence of ##E_{ij}=E_iE_j-\frac 1 2 \delta_{ij}E^2##. In matrix form, this tensor should look like this...
View full post »
Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'

Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'

Please can anyone either:- (1) point me to a derivation of the perpendicular force (Fy) between two very long parallel wires carrying steady currents utilising the formula of Gauss for the force F along the line r between 2 charges? Or alternatively (2) point out where I have gone wrong in my method? I am having problems with calculating the direction and magnitude of the force as expected from modern (Biot-Savart-Maxwell-Lorentz) formula. Here is my method and results so far:- This...
View full post »

Similar threads

B Inductive Reactance of Solenoid with Solid Metal Core With respect to frquency
Replies
5
Views
1K
B Experiment issues (electromagnetism)
Replies
42
Views
2K
Induction heater with high Q factor
Replies
8
Views
2K
Formula for Resonant Frequency of 2 Metal Coaxial Cylinders?
Replies
10
Views
2K
B Why does my LC circuit not oscillate its energy between Electric & Magnetic fields?
4
Replies
152
Views
6K
H-field and MMF in a magnetic circuit
Replies
25
Views
4K
Why does my inductor coil have no effect on my circuit
Replies
8
Views
3K
High-energy LC oscillatory discharge: what kind of switch?
Replies
19
Views
1K
B Ion Trap and Time-Varying Potentials
Replies
1
Views
1K
Need help, Series RLC resonance circuit, not getting high voltage
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top